import { useMemo, useRef, useState } from "react";
import { AnchoredOverlay } from "./OverlaySurface";
import type { AnchorRect } from "./OverlaySurface";
import { FieldTypeIcon, MenuLabel } from "./icons";
import { FieldSelectButton } from "./FieldSelect";
import { CODE_LANGUAGE_LABELS, CODE_LANGUAGES, CREATABLE_TYPES, choiceOptions, choiceRenames,
  codeLanguageOf, directionLabel, isDerivedLink, isMachineOwned,
  isProfileField, parseOptions, ratingMax, ROLLUP_FN_LABELS, ROLLUP_FNS,
  ROLLUP_REF_OPS } from "./types";
import type { AggName, Field, FieldFormat, FieldScope, FieldType, Measure, RollupCondition, RollupFn,
  RollupRefOp, RollupSource, Viewer } from "./types";
import type { LinkTarget, RollupSourceOffer } from "./apiBridge";
import type { WindowSpec } from "./windows";
import { normalizeWindow, windowLabel } from "./windows";
import { WindowPicker } from "../filter-kit";
import { TYPE_LABELS } from "./iconShapes";
import { AGG_LABELS, aggOptions } from "./aggregations";
import { validateFormula } from "./formulaEngine";
import { BRAND_SWATCHES, defaultOptionColor, nearestSwatch, normalizeOptionColor,
  OPTION_PALETTE } from "./choiceColors";

export interface ColumnMenuState {
  fieldKey: string;
  anchor: AnchorRect;
  /**
   * Item 12 (R8) — which pane this opening lands on. Absent = the action list, i.e. every
   * pre-wave-26 opening. `"edit"` is the kanban's "Add option" door.
   *
   * ⚠ Narrowed to the ONE pane that has a door rather than the whole `MenuPane` union: widening
   * it would let any future caller deep-link into `permissions`, whose entry is gated on the
   * viewer inside the menu's own action list — a state you can only reach through a check would
   * become a state you can reach around it.
   */
  pane?: "edit";
}

interface FieldConfigExtra {
  formula?: string;
  max?: number;
  scope?: FieldScope;
  label?: string;
  colorCodeOptions?: boolean;
  optionColors?: Record<string, string>;
  /**
   * ⭐ Wave-20 owner item 15 (contract C-RENAME) — **AN EXPLICIT MAPPING, NEVER A DIFF.**
   *
   * Renaming a choice used to change the DECLARED list and nothing else, so every cell still
   * held the old label and the column went blank-looking: "Blue" was no longer a choice, and
   * the rows that said "Blue" said something the field did not offer. The migration needs to
   * know that Blue BECAME Navy — and neither end can infer that from two lists, because
   * "renamed Blue to Navy" and "deleted Blue, added Navy" produce the identical pair
   * (`routes_tables.py` says the same thing from the server's side).
   *
   * It is knowable HERE, and only here: every option row carries a stable `OptionDraft.id`
   * from the moment the editor opens, so a row whose label changed is a RENAME by identity, a
   * new row is an addition, and a removed row is a removal. No guessing, at either end.
   */
  renames?: { from: string; to: string }[];
  /** Wave-18 C5-AUTOFIELD — an automation column's configuration, the same way `formula`
   *  carries an expression. Validated host-side (`aios_grid._clean_automation`). */
  automation?: { kind: string; source: "record_url_field" | "self"; urlField?: string };
  /** ⭐ 2026-08-07 — a `link` column's target. REQUIRED for the type: `_clean_field` returns
   *  None for a link with no bag, so a create without this is a column that never appears. */
  link?: { table: string; single?: boolean };
  /** ⭐ 2026-08-07 — a `rollup` column's aggregate. Same requirement, same reason.
   *  ⭐ 2026-08-09 — or, INSTEAD, a `source` binding: the read-through kind, which summarises
   *  rows that were never copied into the workspace. The host's `_clean_rollup` reads `source`
   *  first and returns before it ever looks at `link`, so the two are exclusive by construction
   *  rather than by a rule someone has to remember. */
  rollup?: {
    link?: string; field?: string; fn?: string;
    limit?: number; sortBy?: string; sortDir?: "asc" | "desc";
    distinctBy?: string;
    /** ⭐⭐ 2026-08-09 — the PRE-filter: applied before the most-recent window, so "the last 10"
     *  counts only records that already match. `_clean_rollup` refuses a `ref` leaf here (there
     *  is no fixed set yet for a statistic to describe). */
    where?: RollupCondition[];
    whereConj?: "and" | "or";
    conditions?: RollupCondition[];
    conditionConj?: "and" | "or";
    source?: RollupSource;
  };
  /** ⭐ Wave-27 item 13 (R13) — a `code` column's language. OPTIONAL, unlike the two bags above
   *  it: `_clean_field` accepts a code column without one and it renders as plain text, so this
   *  is an ordinary edit rather than a create requirement. */
  code?: { language: string };
}

interface ColumnMenuProps {
  state: ColumnMenuState;
  field: Field;
  /** Every field of the table, for "Change field" (owner item 9): the clicked column can be
   *  swapped for any other field — including hidden ones like Notes — in place. */
  fields: Field[];
  /**
   * ⭐ 2026-08-07 — the OTHER databases a `link` column may point at, with their fields (so the
   * rollup editor can offer real column names rather than a free-text key). Supplied by the host
   * from `GET /tables`, which already filters by `may_open`.
   *
   * ⚠ ABSENT on the Odoo-backed Customer/Product grids, and that is what withdraws the two
   * relational types from their create menu — there is no second user table to point at there,
   * so offering "Link to another record" would be offering a column that can never resolve.
   */
  linkTargets?: LinkTarget[];
  /**
   * ⭐⭐ 2026-08-09 — the READ-THROUGH rollup's offer (topic → measure → dim → window), fetched
   * by the host from `GET /tables/rollup-sources`.
   *
   * ⚠ EMPTY IS MEANINGFUL AND IS THE COMMON CASE. A tenant with no connected source gets `[]`,
   * and the editor then never renders the mode switch at all — a rollup is simply a link fold,
   * as it was before this existed. So this prop is what turns the second kind ON, not a flag.
   */
  rollupSourceOffer?: RollupSourceOffer;
  locked: boolean;
  /** Product-owned preset fields may still drive view actions, but their schema is immutable. */
  schemaLocked?: boolean;
  /** Wave-5 item 1 — who is looking. Gates the permissions entry (creator-or-admin). */
  viewer?: Viewer;
  /** Wave-5 item 3 — what the CURRENT VIEW does with this field, so the conditional
   *  "Don't sort/filter/group by this field" entries render exactly when they apply. */
  sortedDir: "asc" | "desc" | null;
  isFiltered: boolean;
  isGrouped: boolean;
  /** types.isGroupableField, computed by the caller (it owns lockedKey). */
  groupable: boolean;
  onClose: () => void;
  onNote: (note: string) => void;
  onHide: () => void;
  onCreate: (
    label: string,
    type: FieldType,
    anchorKey: string | null,
    side: "left" | "right" | "end",
    options?: string[],
    measureSpec?: { key: string; window: WindowSpec },
    extra?: FieldConfigExtra
  ) => void;
  /** Swap THIS column for another field, in place (owner item 9). */
  onChangeField: (newKey: string) => void;
  /**
   * Wave-2 item 5: the Change-field window's "New field" half — create a fresh overlay field
   * of the chosen type and swap this column for it in one motion. The old field hides exactly
   * as an ordinary change does. Wave-6 item 2 REPLACES this flow on created (`custom_`)
   * fields with `onRetype` below.
   */
  onCreateAndSwap: (
    label: string,
    type: FieldType,
    options?: string[],
    extra?: FieldConfigExtra
  ) => void;
  /**
   * Wave-6 item 2, re-homed by owner item 8 (2026-07-31): supplied for CREATED (`custom_`)
   * fields only — the EDIT FIELD pane's type picker RETYPES THIS FIELD IN PLACE (same key,
   * new type/options; values never converted — unreadable cells show blank, disclosed in the
   * pane). `extra.label` rides along when the name changed in the same save, so rename+retype
   * is ONE upsert — two sequential emits would each read the stale def and revert the other.
   */
  /** ⭐ 2026-08-07 (D-79) — flip the C3 profile flag on a `text` column of a `ut_*` table.
   *  Absent on every surface that is not a user table, which is what hides the control. */
  onProfileFlag?: (key: string, on: boolean) => void;
  onRetype?: (
    type: FieldType,
    options?: string[],
    extra?: FieldConfigExtra
  ) => void;
  /**
   * ⭐⭐ 2026-08-09 (owner) — RECONFIGURE an existing `link`/`rollup` column's bag.
   *
   * A DIFFERENT DOOR FROM `onRetype`, not a variant of it. `onRetype` writes the per-user overlay
   * stratum and refuses anything that is not a `custom_` overlay field; these bags live in the
   * table's SHARED definition and reach it through `PATCH /tables/{key}/fields/{fkey}`. Wiring
   * this through `onRetype` would have meant a Save button that runs and does nothing on exactly
   * the columns the owner was trying to edit.
   *
   * ⚠ Supplied for USER DATABASES only — its absence is what withdraws the editor from the
   * Odoo-backed grids, where there is no such endpoint.
   */
  onFieldConfig?: (patch: {
    label?: string;
    link?: Record<string, unknown>;
    rollup?: Record<string, unknown>;
  }) => void;
  /** Wave-6 item 5 — rename this created field (ordinary field_upsert with a new label).
   *  Supplied for creatable strata only. */
  onRename?: (label: string) => void;
  /**
   * Owner item 8 (2026-07-31) — edit a FORMULA field's source in place (the Edit-field pane's
   * per-type editor for the formula type, validated with the field itself as selfKey so a
   * cycle is refused at authoring). `label` rides along exactly like onRetype's — one upsert.
   * Supplied for created formula fields only.
   */
  onFormula?: (formula: string, label?: string) => void;
  /** Wave-6 item 4 — open straight into the create form at this position (the header "+"
   *  passes "end"). Cancel then CLOSES rather than falling back to the action list. */
  initialPosition?: CreatePosition;
  /**
   * ⭐ WAVE-26 ITEM 12 (owner ruling R8) — open straight into a PANE, the way `initialPosition`
   * opens straight into the create form.
   *
   * The kanban's "Add option" door passes `"edit"`. The owner's words were *"its literally the
   * same thing as adding a new option when you click edit field on multi-select"*, and this prop
   * is what makes that literal rather than approximate: the lane editor IS this component's Edit
   * pane, so it writes the SHARED field definition through the same `onRetype` upsert, obeys the
   * same permission wall, carries the same rename-by-row-identity migration and the same colour
   * swatches. A second options editor would have had to re-earn every one of those.
   *
   * Back then CLOSES — same rule as `initialPosition`: there is no action list behind a pane
   * that was opened directly.
   */
  initialPane?: MenuPane;
  /** Wave-6 item 9c — true on the cohort page: the create forms offer the Scope control
   *  ("This cohort table only" = DEFAULT vs "All customer tables"). */
  scopeChoice?: boolean;
  /** Wave-6 item 11c — pin state + actions. `onPinTo` absent when pinning would be a no-op
   *  (identity column, or already the boundary); `onUnpin` absent when nothing is pinned. */
  pinnedTo?: boolean;
  onPinTo?: () => void;
  onUnpin?: () => void;
  /**
   * Wave-2 item 8c: change the PERIOD of a measure-carrying column. Supplied for any field with
   * `.measure` — user-created `measure_*` columns and the pre-set measure fields alike. The
   * caller emits the ordinary `field_upsert` (and auto-renames the header when the user never
   * renamed it).
   */
  onPeriod?: (window: WindowSpec) => void;
  /**
   * Delete this USER-CREATED column outright (owner gap closed 2026-07-27). Supplied ONLY for
   * the deletable strata (`custom_` overlay fields, `measure_` formula columns) — absent means
   * the control is not rendered at all, so a base field cannot even be offered the action.
   */
  onDelete?: () => void;
  /** Wave-5 item 1 — Duplicate field. Supplied for creatable strata only (base Odoo fields
   *  offer no Duplicate — cloning the source of truth into an editable copy is out of scope). */
  onDuplicate?: () => void;
  /** Wave-5 item 1 — save a permissions change. Supplied iff the VIEWER may change them
   *  (isAdmin || createdBy === viewer.name, and only on creatable strata). */
  onPermissions?: (edit: "everyone" | "creator" | "admins") => void;
  /** Wave-5 item 10 — save a display format. Supplied for number/currency/formula and
   *  date/created_time fields. */
  onFormat?: (format: FieldFormat) => void;
  /** ⭐ WAVE-29 T33 (owner item 17) — set (or clear, with `undefined`) this column's SUMMARY: the
   *  value its group footers and the table's totals row show. Supplied wherever a field write is
   *  possible; the pane offers only what `aggregations.aggOptions` allows for the type. */
  onAggregate?: (agg: AggName | undefined) => void;
  /** Wave-5 item 1 — Sort by this field (replaces the view's sort), and the conditional
   *  clears (item 3). All of these mutate the EXISTING view config — no new host surface. */
  onSort: (dir: "asc" | "desc") => void;
  onClearSort: () => void;
  onFilterBy: () => void;
  onClearFilter: () => void;
  onGroupByField: () => void;
  onClearGroup: () => void;
  /** Assignable people, from the host's real user list. Empty = the host did not supply one,
   *  and "Assignee" is offered without choices rather than with invented ones. */
  userOptions?: string[];
  /**
   * CG-8's measures, reused as the vocabulary of a FORMULA-MEASURE column (owner item 7):
   * `Sales · the last 90 days` as a column the user creates. Empty = the semantic store is
   * unavailable here, and the option is simply not offered (same rule as measure conditions).
   */
  measures?: Measure[];
}

type CreatePosition = "left" | "right" | "end";

// ⚠ wave-7 item W4's menu-action icon set + `MenuLabel` MOVED to `icons.tsx` (wave-14
// item 19): the view menu needs the same vocabulary, and two hand-drawn padlocks in two
// files is how one of them ends up a different padlock. `icon=` takes a NAME now.

/**
 * The menu's panes (wave-5 item 2). The NOTE editor and the editors used to render inline in
 * the menu body; each opens its OWN dedicated window. One overlay, one pane at a time;
 * "menu" is the action list.
 *
 * Owner item 8 (2026-07-31): "edit" ABSORBS the former "rename" and "swap" panes — one
 * Airtable-grade Edit-field window owning the field's name, its type (with the per-type
 * choices/stars/formula config), and the Change-field control that swaps the column to show
 * another field.
 */
type MenuPane = "menu" | "note" | "edit" | "permissions" | "format" | "summary";

/**
 * How each creatable type reads in the menu. DERIVED from CREATABLE_TYPES rather than listed
 * again: a hand-maintained copy is a third place the vocabulary lives, and the failure mode is
 * silent — add a type to the contract, forget this list, and the type is accepted by the host,
 * asserted by the drift gate, and simply never offered to anyone.
 *
 * `Record<FieldType, string>` is what forces it: adding a member to the union without a label
 * here fails `tsc`, so the compiler is the gate and no test has to click a canvas header menu.
 *
 * Wave-8 I20: the map itself MOVED to icons.tsx, beside the per-type glyphs — a type's label
 * and its icon are one vocabulary, and splitting them across two files is how they drift.
 * Imported here; the totality guarantee above is unchanged (icons.tsx types it identically).
 */
const FIELD_TYPES = CREATABLE_TYPES.map((value) => ({ value, label: TYPE_LABELS[value] }));

/** Types whose choices are declared in an options editor at creation time. */
function needsOptions(t: FieldType | "measure"): boolean {
  return t === "select" || t === "multiselect";
}

interface OptionDraft {
  id: string;
  label: string;
  color: string;
}

const DEFAULT_OPTION_LABELS = ["Not started", "In progress", "Blocked", "Done"];

/**
 * ⭐ WAVE 28 · R4 / C1 — how a SET-STATISTIC comparison reads in the operator list.
 *
 * ⛔ KEYED BY `RollupRefOp`, so the day `core.user_tables.ROLLUP_REF_OPS` gains or loses an
 * operator this map fails to compile rather than rendering a bare identifier — the same
 * discipline `ROLLUP_FN_LABELS` uses, and the reason the σ picker maps `ROLLUP_REF_OPS` instead
 * of hand-filtering the full operator list.
 * ⚠ The wording names the STATISTIC, not the arithmetic: "2 σ above the mean" is the sentence a
 * person is trying to write, and "is greater than mean + k·stdev" is the implementation of it.
 */
/**
 * ⭐ MIRRORS `core.user_tables.ROLLUP_MAX_SIGMAS`, and `verify_rollup_editor.py` HOLDS THE TWO IN
 * STEP by importing the server's constant and comparing (a real enforcer this time — `types.ts`
 * spent a wave claiming one that contained zero occurrences of the word it guarded,
 * [[limit-with-no-enforcer]]).
 *
 * ⛔ WHY THE CONTROL MUST KNOW THE BOUND AT ALL. `_clean_rollup` REFUSES the whole field outside
 * this range — not the leaf, the FIELD — so an unbounded box invites a value and then answers a
 * 400 naming a cap the control never mentioned. That is `maxPosts` exactly: it offered 200 while
 * the save door refused anything over 12 ([[default-must-pass-its-own-guard]]). A control must
 * display what it will SEND.
 */
const MAX_SIGMAS = 10;

/** The default when a σ row is born or its box is left empty — C1's worked example uses 2. */
const DEFAULT_SIGMAS = 2;

const REF_OP_LABELS: Record<RollupRefOp, string> = {
  gt: "is more than … σ above the mean",
  gte: "is at least … σ above the mean",
  lt: "is less than … σ above the mean",
  lte: "is at most … σ above the mean",
};

/**
 * ⭐⭐ 2026-08-09 (owner) — ONE CONDITION LIST, RENDERED TWICE, because a rollup now filters at
 * two different moments and they mean different things.
 *
 * Owner: *"instead of last 12 posts, we also want to make it so its last N record, where the
 * record's Status is video."* That is a filter the WINDOW must respect — pick the reels first,
 * then take the last 10 of them. The existing list is the opposite by design (wave 28 / C1 moved
 * it below the window so a `ref: {sigmas}` threshold is a statistic OF the rows being folded), so
 * the two cannot be one control.
 *
 * ⛔ EXTRACTED RATHER THAN COPIED. Two near-identical 130-line JSX blocks is how one of them
 * keeps offering an operator the other dropped — and the operator list here is already the
 * server's (`ROLLUP_REF_OPS`), so a hand-edited second copy would drift from `_clean_rollup`
 * silently ([[one-evaluator-per-question]]).
 * ⛔ `allowRef` IS A REFUSAL MIRRORED, NOT A UI PREFERENCE. `_clean_rollup` refuses a `ref` leaf
 * in `where` — before the window there is no fixed set for a mean to be about — so offering the
 * σ operators there would be a control whose only outcome is a 400 on the whole field.
 */
function RollupConditionList({
  title,
  hint,
  conditions,
  onConditions,
  conj,
  onConj,
  targetFields,
  allowRef,
  idPrefix,
}: {
  title: string;
  hint: string;
  conditions: RollupCondition[];
  onConditions: (v: RollupCondition[]) => void;
  conj: "and" | "or";
  onConj: (v: "and" | "or") => void;
  targetFields: { key: string; label: string }[];
  allowRef: boolean;
  idPrefix: string;
}) {
  const patch = (index: number, next: RollupCondition) =>
    onConditions(conditions.map((item, i) => (i === index ? next : item)));
  return (
    <div className="cg-rollup-conditions">
      <div className="cg-rollup-conditions__head">
        <span>{title}</span>
        <button
          type="button"
          className="cg-btn"
          disabled={targetFields.length === 0 || conditions.length >= 20}
          onClick={() => onConditions([
            ...conditions,
            { field: targetFields[0]?.key ?? "", op: "eq", value: "" },
          ])}
        >
          Add condition
        </button>
      </div>
      {conditions.length > 1 ? (
        <select
          className="cg-input"
          aria-label={`Match all or any ${title.toLowerCase()} conditions`}
          value={conj}
          onChange={(event) => onConj(event.target.value as "and" | "or")}
        >
          <option value="and">All conditions must match</option>
          <option value="or">Any condition may match</option>
        </select>
      ) : null}
      {conditions.map((condition, index) => (
        <div className="cg-rollup-condition" key={`${idPrefix}-${index}-${condition.field}`}>
          <select
            className="cg-input"
            aria-label={`${title} condition ${index + 1} column`}
            value={condition.field}
            onChange={(event) => patch(index, { ...condition, field: event.target.value })}
          >
            {targetFields.map((targetField) => (
              <option key={targetField.key} value={targetField.key}>{targetField.label}</option>
            ))}
          </select>
          {/*
            ⭐⭐ WAVE 28 · R4 / C1 — THE THRESHOLD MAY BE THE SET'S OWN STATISTICS.
            Owner's request (Nurilab): an average of the last 10 posts with outliers trimmed —
            "anything beyond 2 sigma". That is not a new aggregator, it is a CONDITION whose
            threshold is computed from the scoped rows themselves: mean + k*stdev of the same
            column, over the window `sortBy`+`limit` kept, BEFORE these conditions filter.

            ⛔ ONE CONTROL, NOT TWO, AND THAT IS WHAT MAKES THE XOR SAFE. `value` and `ref` may
            never both be present — the server refuses the whole FIELD, not just the leaf — so
            a separate "compare against…" switch beside the operator would leave the editor
            free to write a `ref` while a stale `value` still rode along, producing a 400 on
            Save that names a key the user never typed. Folding the choice into the operator
            makes the illegal state unrepresentable: picking a plain op WRITES `value` and
            drops `ref`, picking a statistic op does the reverse, and there is no third path.

            ⚠ THE OPS ARE `ROLLUP_REF_OPS`, IMPORTED, never a hand-filtered copy of the full
            list. `eq`/`neq` against a computed float is a coin flip on binary representation
            and `contains` against a number never matches — the server draws that line and a
            second copy here would be free to drift from it.
            ⚠ THE `value` IS COMPOUND (`ref:gt`) so the select always resolves to exactly one
            option. A `<select>` whose value matches nothing renders the FIRST option while
            the stored key says otherwise, and the next patch writes the lie back
            ([[cg-condition-builder-items]]).
          */}
          <select
            className="cg-input"
            aria-label={`${title} condition ${index + 1} operator`}
            value={condition.ref ? `ref:${condition.op}` : condition.op}
            onChange={(event) => {
              const raw = event.target.value;
              const isRef = raw.startsWith("ref:");
              const op = (isRef ? raw.slice(4) : raw) as RollupCondition["op"];
              // ⛔ THE LEAF IS REBUILT, NEVER SPREAD-AND-PATCHED. `{ ...item, ref: undefined }`
              // leaves the key present-and-undefined; `JSON.stringify` drops it today, but the
              // contract is "the key is absent", and relying on a serialiser's treatment of
              // `undefined` to enforce a server-side XOR is a guarantee held by accident.
              patch(index, isRef
                ? { field: condition.field, op,
                    ref: { sigmas: condition.ref?.sigmas ?? DEFAULT_SIGMAS } }
                : { field: condition.field, op, value: condition.value ?? "" });
            }}
          >
            <optgroup label="Compared with a value">
              <option value="eq">is</option>
              <option value="neq">is not</option>
              <option value="contains">contains</option>
              <option value="not_contains">does not contain</option>
              <option value="is_empty">is empty</option>
              <option value="is_not_empty">is not empty</option>
              <option value="gt">is greater than</option>
              <option value="gte">is at least</option>
              <option value="lt">is less than</option>
              <option value="lte">is at most</option>
            </optgroup>
            {allowRef ? (
              <optgroup label="Compared with the set's own spread">
                {ROLLUP_REF_OPS.map((op) => (
                  <option key={op} value={`ref:${op}`}>{REF_OP_LABELS[op]}</option>
                ))}
              </optgroup>
            ) : null}
          </select>
          {condition.ref ? (
            <label className="cg-cond-ref">
              {/* ⚠ A BARE NUMBER BOX WOULD BE A CONTROL THAT WILL NOT SAY WHAT IT SETS. The
                  unit is sigmas and the sign is meaningful (negative selects the LOW tail), so
                  both are printed beside the input rather than left to be inferred from a
                  placeholder. */}
              <input
                className="cg-input"
                type="number"
                step="0.5"
                /* ⛔ THE SERVER'S OWN BOUND, BOTH WAYS. Outside it `_clean_rollup` refuses the
                   whole FIELD, so an unbounded box would invite a 400 naming a cap it never
                   showed — `maxPosts`'s scar, in a control built the same day it was quoted. */
                min={-MAX_SIGMAS}
                max={MAX_SIGMAS}
                aria-label={`${title} condition ${index + 1} standard deviations from the mean`}
                /* ⚠ UNCONTROLLED + COMMIT ON BLUR, the idiom `maxPosts` uses and for its
                   reason: a controlled box patching per keystroke stores "-" as 0 and "1" on
                   the way to "1.5" as a legal value, and `Number("")` is 0 — so simply
                   CLEARING the box would silently store "0 sigma", a real but different
                   query, and the field could never be retyped because it snaps back. */
                defaultValue={String(condition.ref.sigmas)}
                onBlur={(event) => {
                  const raw = Number(event.target.value);
                  // Empty/garbage falls back to the default rather than to 0 — 0 means "at
                  // the mean" and is a value somebody must choose, never one they land on by
                  // deleting a character.
                  const parsed = event.target.value.trim() === "" || !Number.isFinite(raw)
                    ? DEFAULT_SIGMAS
                    : raw;
                  // CLAMPED, not refused: the box is a dial, and a dial that rejects is a
                  // dead control. The clamp is what makes "displays what it will send" true.
                  const sigmas = Math.max(-MAX_SIGMAS, Math.min(MAX_SIGMAS, parsed));
                  if (String(sigmas) !== event.target.value) event.target.value = String(sigmas);
                  patch(index, { field: condition.field, op: condition.op, ref: { sigmas } });
                }}
              />
              <span>σ from the mean of this column (negative reads below it)</span>
            </label>
          ) : !(["is_empty", "is_not_empty"] as string[]).includes(condition.op) ? (
            <input
              className="cg-input"
              aria-label={`${title} condition ${index + 1} value`}
              value={condition.value ?? ""}
              onChange={(event) => patch(index, {
                field: condition.field, op: condition.op, value: event.target.value,
              })}
            />
          ) : null}
          <button
            type="button"
            className="cg-icon-btn"
            aria-label={`Remove ${title.toLowerCase()} condition ${index + 1}`}
            onClick={() => onConditions(conditions.filter((_item, i) => i !== index))}
          >
            ×
          </button>
        </div>
      ))}
      <div className="cg-field-hint">{hint}</div>
    </div>
  );
}

let optionDraftSequence = 0;

function nextOptionDraftId(): string {
  optionDraftSequence += 1;
  return `choice-${optionDraftSequence}`;
}

function optionDrafts(
  labels: string[],
  saved: Record<string, string> | undefined = undefined
): OptionDraft[] {
  return labels.map((label) => ({
    id: nextOptionDraftId(),
    label,
    color:
      normalizeOptionColor(saved?.[label]) ??
      normalizeOptionColor(defaultOptionColor(label))!,
  }));
}

function optionSettings(
  drafts: OptionDraft[],
  type: FieldType | "measure"
): { options: string[]; colors: Record<string, string> } {
  const clean = drafts.map((draft) =>
    type === "multiselect" ? draft.label.replace(/,/g, " ") : draft.label
  );
  const options = parseOptions(clean.join("\n"));
  const firstByLabel = new Map<string, OptionDraft>();
  drafts.forEach((draft, index) => {
    const label = clean[index].trim();
    if (label && !firstByLabel.has(label.toLowerCase()))
      firstByLabel.set(label.toLowerCase(), draft);
  });
  const colors: Record<string, string> = {};
  for (const option of options) {
    const draft = firstByLabel.get(option.toLowerCase());
    const color = normalizeOptionColor(draft?.color);
    // The deterministic fallback is not durable data. Persist only a genuine user override;
    // this keeps an untouched legacy field byte-stable while a renamed row retains its colour.
    if (color && color !== normalizeOptionColor(defaultOptionColor(option)))
      colors[option] = color;
  }
  return { options, colors };
}

function optionAppearanceSignature(
  options: string[],
  colors: Record<string, string> | undefined
): string {
  return options
    .map((option) => {
      const custom = colors
        ? Object.entries(colors).find(
            ([label]) => label.trim().toLowerCase() === option.toLowerCase()
          )?.[1]
        : undefined;
      return `${option}\u0000${
        normalizeOptionColor(custom) ?? normalizeOptionColor(defaultOptionColor(option))
      }`;
    })
    .join("\u0001");
}

/**
 * Item 22 (R5) — the option COLOUR control: ten brand swatches, no free RGB.
 *
 * It was an `<input type="color">`, which offered sixteen million colours in a product whose
 * whole visual argument is five. The trigger keeps the old 24px circle's footprint (it is the
 * same affordance in the same place) and opens a 5×2 grid: each hue's light `-tint` on the top
 * row, its `-pastel` beneath. A stored colour that is not on the palette marks its NEAREST
 * swatch — so the picker says what the value reads as — and re-picking is what rewrites it.
 */
function SwatchPicker({
  value,
  disabled,
  label,
  onPick,
}: {
  value: string | undefined;
  disabled?: boolean;
  /** The option this colours, for the accessible name. */
  label: string;
  onPick: (hex: string) => void;
}) {
  const [open, setOpen] = useState(false);
  const ref = useRef<HTMLButtonElement>(null);
  const current = nearestSwatch(value);
  return (
    <>
      <button
        ref={ref}
        type="button"
        className="cg-option-color"
        disabled={disabled}
        style={{ background: current?.bg ?? normalizeOptionColor(value) ?? "#FFFFFF" }}
        aria-label={`Colour for ${label}${current ? ` — ${current.label}` : ""}`}
        aria-haspopup="dialog"
        aria-expanded={open}
        title="Change option colour"
        onClick={() => setOpen((o) => !o)}
      />
      {open && ref.current && (
        <AnchoredOverlay
          anchor={ref.current}
          className="cg-pop cg-swatch-pop"
          onDismiss={() => setOpen(false)}
          role="dialog"
          ariaLabel={`Colour for ${label}`}
          dataKind="option-colour"
        >
          <div className="cg-swatch-grid">
            {BRAND_SWATCHES.map((swatch) => (
              <button
                key={swatch.id}
                type="button"
                className={"cg-swatch" + (current?.id === swatch.id ? " is-on" : "")}
                style={{ background: swatch.bg, color: swatch.fg }}
                aria-label={swatch.label}
                aria-pressed={current?.id === swatch.id}
                title={swatch.label}
                onClick={() => {
                  onPick(swatch.bg);
                  setOpen(false);
                }}
              >
                {/* The check is drawn in the swatch's OWN ink, which is also the ink its
                    chips will use — so the mark doubles as a preview of readability. */}
                {current?.id === swatch.id && (
                  <svg width="12" height="12" viewBox="0 0 16 16" fill="none" aria-hidden>
                    <path
                      d="m3.5 8.5 3 3 6-6.5"
                      stroke="currentColor"
                      strokeWidth="2"
                      strokeLinecap="round"
                      strokeLinejoin="round"
                    />
                  </svg>
                )}
              </button>
            ))}
          </div>
        </AnchoredOverlay>
      )}
    </>
  );
}

function OptionsEditor({
  idPrefix,
  drafts,
  onDrafts,
  colorCode,
  onColorCode,
  type,
}: {
  idPrefix: string;
  drafts: OptionDraft[];
  onDrafts: (next: OptionDraft[]) => void;
  colorCode: boolean;
  onColorCode: (next: boolean) => void;
  type: FieldType | "measure";
}) {
  const update = (id: string, patch: Partial<OptionDraft>) =>
    onDrafts(drafts.map((draft) => (draft.id === id ? { ...draft, ...patch } : draft)));
  const settings = optionSettings(drafts, type);
  return (
    <div className="cg-options-editor">
      <div className="cg-options-head">
        <strong>Options</strong>
        <label className="cg-option-toggle">
          <input
            type="checkbox"
            checked={colorCode}
            onChange={(event) => onColorCode(event.target.checked)}
          />
          <span>Color-code options</span>
        </label>
      </div>
      <div className="cg-option-list">
        {drafts.map((draft, index) => (
          <div className="cg-option-row" key={draft.id}>
            <SwatchPicker
              value={
                normalizeOptionColor(draft.color) ??
                OPTION_PALETTE[index % OPTION_PALETTE.length].bg
              }
              disabled={!colorCode}
              label={draft.label || `option ${index + 1}`}
              onPick={(hex) => update(draft.id, { color: hex })}
            />
            <input
              id={`${idPrefix}-${draft.id}`}
              className="cg-input cg-option-name"
              type="text"
              maxLength={120}
              value={draft.label}
              placeholder="Option name"
              aria-label={`Option ${index + 1}`}
              onChange={(event) => {
                const label =
                  type === "multiselect"
                    ? event.target.value.replace(/,/g, " ")
                    : event.target.value;
                update(draft.id, { label });
              }}
              onKeyDown={(event) => {
                if (event.key !== "Enter") return;
                event.preventDefault();
                onDrafts([
                  ...drafts,
                  {
                    id: nextOptionDraftId(),
                    label: "",
                    color: OPTION_PALETTE[drafts.length % OPTION_PALETTE.length].bg,
                  },
                ]);
              }}
            />
            <button
              type="button"
              className="cg-option-remove"
              aria-label={`Remove ${draft.label || `option ${index + 1}`}`}
              title="Remove option"
              onClick={() => onDrafts(drafts.filter((item) => item.id !== draft.id))}
            >
              <svg viewBox="0 0 16 16" aria-hidden="true">
                <path d="M4 4l8 8M12 4l-8 8" />
              </svg>
            </button>
          </div>
        ))}
      </div>
      <button
        type="button"
        className="cg-option-add"
        onClick={() =>
          onDrafts([
            ...drafts,
            {
              id: nextOptionDraftId(),
              label: "",
              color: OPTION_PALETTE[drafts.length % OPTION_PALETTE.length].bg,
            },
          ])
        }
      >
        Add option
      </button>
      <span className="cg-field-hint">
        {settings.options.length} option{settings.options.length === 1 ? "" : "s"}.
        {type === "multiselect" && " Commas inside an option are not supported."}
      </span>
    </div>
  );
}

/**
 * The create-picker's kind: a creatable overlay type, or the FORMULA-MEASURE pseudo-kind.
 * "measure" is deliberately NOT a FieldType — a measure column's real type comes from the
 * measure itself (currency/int/pct), and widening the union would let it leak into every
 * switch that renders cells.
 */
type CreateKind = FieldType | "measure";

/**
 * Owner item 8 (2026-07-31) — the create pane's field-type picker: a find box over an icon
 * listbox, replacing the icon-less native select. Each row wears the SAME mark its column
 * header will wear (`FieldTypeIcon` ← TYPE_SHAPES), so the vocabulary teaches itself. The
 * "measure" pseudo-kind borrows the currency mark: a measure column's real type is
 * currency/int/pct, and inventing a 17th glyph for a pseudo-kind would put a mark on screen
 * that no column ever wears.
 */
function TypePicker({
  value,
  onPick,
  offerMeasure,
  only,
}: {
  value: CreateKind;
  onPick: (k: CreateKind) => void;
  offerMeasure: boolean;
  /** Restrict the list (the Edit-field pane passes RETYPE_TYPES — the overlay-editable
   *  strata a created field may become). Absent = every creatable type. */
  only?: readonly FieldType[];
}) {
  const [q, setQ] = useState("");
  const needle = q.trim().toLowerCase();
  const base = only
    ? FIELD_TYPES.filter((r) => (only as readonly string[]).includes(r.value))
    : FIELD_TYPES;
  const rows: { value: CreateKind; label: string }[] = [
    ...base,
    // C-NAME (item 9, 2026-08-02): "Formula measure (over a period)" -> "Metric". Two words
    // of jargon and a parenthetical, replaced by the word people already use for the thing.
    // The internal key stays `measure` — see the C-NAME amendment in the wave doc.
    ...(offerMeasure
      ? [{ value: "measure" as CreateKind, label: "Metric" }]
      : []),
  ].filter((r) => !needle || r.label.toLowerCase().includes(needle));
  return (
    <div className="cg-type-picker">
      <div className="cg-type-search">
        <svg width="13" height="13" viewBox="0 0 16 16" fill="none" aria-hidden="true">
          <circle cx="7" cy="7" r="4.4" stroke="currentColor" strokeWidth="1.35" />
          <path
            d="m10.4 10.4 3.1 3.1"
            stroke="currentColor"
            strokeWidth="1.35"
            strokeLinecap="round"
          />
        </svg>
        <input
          type="text"
          value={q}
          placeholder="Find a field type"
          aria-label="Find a field type"
          onChange={(event) => setQ(event.target.value)}
        />
      </div>
      <div className="cg-type-list" role="listbox" aria-label="Field type">
        {rows.map((r) => (
          <button
            key={r.value}
            type="button"
            role="option"
            aria-selected={value === r.value}
            className={"cg-type-row" + (value === r.value ? " is-on" : "")}
            onClick={() => onPick(r.value)}
          >
            <FieldTypeIcon type={r.value === "measure" ? "currency" : r.value} size={16} />
            <span className="cg-type-label">{r.label}</span>
            {value === r.value && (
              <svg
                className="cg-type-check"
                width="14"
                height="14"
                viewBox="0 0 16 16"
                fill="none"
                aria-hidden="true"
              >
                <path
                  d="m3.5 8.5 3 3 6-6.5"
                  stroke="currentColor"
                  strokeWidth="1.6"
                  strokeLinecap="round"
                  strokeLinejoin="round"
                />
              </svg>
            )}
          </button>
        ))}
        {rows.length === 0 && <div className="cg-pop-note">No matching type.</div>}
      </div>
    </div>
  );
}

/** The Change-field dropdown's "New field" entries. A colon cannot occur in a real field key
 *  (keys are slugs), so the prefix cannot collide with one. */
const NEW_PREFIX = "new:";

/**
 * The types a created field may be retyped TO (the Edit-field pane's type picker): the
 * overlay-editable strata only. `formula` and `created_time` are a DIFFERENT stratum
 * (source 'odoo', host-computed shape) — turning an overlay column into one is not a retype,
 * and the host accepts in-place rebuilds on `custom_` overlay defs only.
 */
// Wave-18 C5-AUTOFIELD: `automation` joins the exclusion, and for a reason the two above do not
// share. It IS an overlay type, so the host would accept the retype — which is exactly the
// hazard. Retyping a Notes column to Automation hands every row's typed value to the next run to
// overwrite; retyping the other way strands machine-written statuses in a column a person can
// now edit. Neither is a change of TYPE, both are data loss with a tidy name.
const RETYPE_TYPES = CREATABLE_TYPES.filter(
  (t) => t !== "formula" && t !== "created_time" && t !== "automation"
);

/** The automation kinds a column can carry. v1 is one; the shape is a list so the second is a
 *  line rather than a refactor. Mirrors `aios_grid.AUTOMATION_KINDS` (host-whitelisted). */
const AUTOMATION_KINDS: { key: string; label: string; hint: string }[] = [
  {
    key: "instagram_profile",
    label: "Instagram profile",
    hint: "Reads what is anonymously public about the profile in the chosen URL column, and "
      + "writes the result here. Runs from the Automation surface — on demand or on a schedule.",
  },
];

const DEFAULT_MEASURE_WINDOW: WindowSpec = { kind: "ltm" };

/** The head every pane shares: title line, context line, close X. */
function PaneHead({
  title,
  sub,
  onClose,
}: {
  title: string;
  sub?: string;
  onClose: () => void;
}) {
  return (
    <div className="cg-column-head">
      <div>
        <div className="cg-column-title">{title}</div>
        {sub && <div className="cg-column-type">{sub}</div>}
      </div>
      <button
        type="button"
        className="cg-icon-btn"
        onClick={onClose}
        aria-label="Close column menu"
      >
        ×
      </button>
    </div>
  );
}

/**
 * Wave-6 item 9c — the Scope control, rendered by BOTH create surfaces on the cohort page
 * (one component so the two doors cannot drift). "This cohort table only" is the DEFAULT —
 * the owner's ask: a field made while working a cohort belongs to that work unless the user
 * says otherwise.
 */
function ScopeControl({
  value,
  onValue,
}: {
  value: FieldScope;
  onValue: (v: FieldScope) => void;
}) {
  return (
    <label>
      <span>Scope</span>
      {/* ⛔ wave17 R1 — "cohort" scope means *served ONLY on the cohort TABLE*, and that table
          (the retired `#/cohort` surface) no longer exists. A field created with it today would
          be reachable from nowhere. So it is DISABLED for new selection.

          ⚠ It is still RENDERED, and only disabled when it is not the current value. A `<select>`
          whose `value` matches no option renders the FIRST option instead
          ([[cg-condition-builder-items]]) — dropping the row outright would silently re-scope
          every existing cohort-scoped field to global on the next save, which is a data change
          nobody asked for wearing a cosmetic edit's clothes. */}
      <select
        className="cg-select cg-scope-select"
        value={value}
        aria-label="Field scope"
        onChange={(event) => onValue(event.target.value as FieldScope)}
      >
        <option value="cohort" disabled={value !== "cohort"}>
          The cohort table only (retired)
        </option>
        <option value="global">All customer tables</option>
      </select>
    </label>
  );
}

/**
 * Wave-5 items 9/11 — the extra editors a new field's type may need, shared VERBATIM by the
 * two create surfaces (insert-field and Change-field's "New field" half) so the two doors
 * cannot drift: a FORMULA gets its source editor with live validation and a reference picker;
 * a RATING gets its star count (the contract's 2..10).
 */
function ExtraTypeEditor({
  kind,
  fields,
  formulaText,
  onFormulaText,
  formulaError,
  maxValue,
  onMaxValue,
  codeLanguage,
  onCodeLanguage,
  idPrefix,
  showFormulaHelp = true,
  automationKind = "instagram_profile",
  onAutomationKind,
  automationUrlField = "",
  onAutomationUrlField,
  linkTargets = [],
  linkTable = "",
  onLinkTable,
  linkSingle = false,
  onLinkSingle,
  rollupMode = "link",
  onRollupMode,
  rollupSourceOffer = { topics: [], windows: [] },
  rollupSource = { topic: "", measure: "", groupBy: "", on: "", window: "ytd" },
  onRollupSource,
  rollupLink = "",
  onRollupLink,
  rollupField = "",
  onRollupField,
  rollupFn = "sum",
  onRollupFn,
  rollupLimit = 0,
  onRollupLimit,
  rollupSortBy = "",
  onRollupSortBy,
  rollupDistinctBy = "",
  onRollupDistinctBy,
  rollupWhere = [],
  onRollupWhere,
  rollupWhereConj = "and",
  onRollupWhereConj,
  rollupConditions = [],
  onRollupConditions,
  rollupConditionConj = "and",
  onRollupConditionConj,
}: {
  kind: FieldType | "measure";
  fields: Field[];
  formulaText: string;
  onFormulaText: (v: string) => void;
  formulaError: string | null;
  maxValue: number;
  onMaxValue: (n: number) => void;
  /** ⭐ Wave-27 item 13 (R13) — the code column's language draft. REQUIRED at every call site,
   *  unlike the `automation` drafts below it: this pane RENDERS a <select> for a `code` kind, and
   *  an unwired one would be a control that configures nothing, which is worse than no control
   *  ([[wrong-parent-not-broken-control]]). Every mount can reach the kind, so every mount says
   *  which draft it is editing. */
  codeLanguage: string;
  onCodeLanguage: (v: string) => void;
  idPrefix: string;
  showFormulaHelp?: boolean;
  /** C5-AUTOFIELD — the automation column's config drafts. Optional so the call sites that
   *  cannot reach an automation type (the Change-field "new field" form) need no change. */
  automationKind?: string;
  onAutomationKind?: (v: string) => void;
  automationUrlField?: string;
  onAutomationUrlField?: (v: string) => void;
  /** ⭐ 2026-08-07 — the relational drafts. Optional for the same reason the automation ones
   *  are: the Change-field "new field" form reaches these kinds too, and a call site that does
   *  not offer them should need no change. */
  linkTargets?: LinkTarget[];
  linkTable?: string;
  onLinkTable?: (v: string) => void;
  linkSingle?: boolean;
  onLinkSingle?: (v: boolean) => void;
  /** ⭐ 2026-08-09 — which KIND of rollup is being built. `"link"` folds workspace rows;
   *  `"source"` reads through to a governed Odoo topic without copying a row into the store. */
  rollupMode?: "link" | "source";
  onRollupMode?: (v: "link" | "source") => void;
  rollupSourceOffer?: RollupSourceOffer;
  rollupSource?: RollupSource;
  onRollupSource?: (v: RollupSource) => void;
  rollupLink?: string;
  onRollupLink?: (v: string) => void;
  rollupField?: string;
  onRollupField?: (v: string) => void;
  rollupFn?: RollupFn;
  onRollupFn?: (v: RollupFn) => void;
  rollupLimit?: number;
  onRollupLimit?: (v: number) => void;
  rollupSortBy?: string;
  onRollupSortBy?: (v: string) => void;
  rollupDistinctBy?: string;
  onRollupDistinctBy?: (v: string) => void;
  /** ⭐⭐ 2026-08-09 — the PRE-filter (`rollup.where`): which linked records the window may
   *  spend its slots on. Separate from `rollupConditions`, which runs after it. */
  rollupWhere?: RollupCondition[];
  onRollupWhere?: (v: RollupCondition[]) => void;
  rollupWhereConj?: "and" | "or";
  onRollupWhereConj?: (v: "and" | "or") => void;
  rollupConditions?: RollupCondition[];
  onRollupConditions?: (v: RollupCondition[]) => void;
  rollupConditionConj?: "and" | "or";
  onRollupConditionConj?: (v: "and" | "or") => void;
}) {
  if (kind === "formula") {
    // 2026-07-31 (owner item 2): other FORMULA fields are referencable now — evaluation is
    // topological and a cycle is refused at validation, so the old exclusion is gone.
    const referencable = fields.filter((f) => f.key !== "__proto__");
    return (
      <>
        <label>
          <span>Formula</span>
          <textarea
            className="cg-input cg-formula-editor"
            rows={3}
            value={formulaText}
            placeholder={"MAX(0, {revenue_ly} - {revenue_ytd})"}
            aria-label="Formula"
            onChange={(event) => onFormulaText(event.target.value)}
          />
        </label>
        <div className="cg-cond-line cg-formula-insert">
          <FieldSelectButton
            ariaLabel="Insert a field reference"
            placeholder="Insert a field reference…"
            // An ACTION picker, not a value one: it never holds a selection, so it stays in
            // the placeholder state and `keepOpen` lets a formula take three references
            // without three trips through the button.
            value={undefined}
            keepOpen
            onChange={(key) =>
              onFormulaText((formulaText + " {" + key + "}").trimStart())
            }
            fields={referencable.map((f) => ({
              key: f.key, label: f.label, type: f.type,
            }))}
          />
        </div>
        {/*
          ⭐ 2026-08-10 — THE BLANK TRAP, said before it is hit rather than after.

          `{a} - {b}` is BLANK when `b` is blank, because arithmetic propagates a missing
          operand — so the trimmed-average chain the owner built ("views minus the outliers")
          blanks its whole column on exactly the profiles that have NO outlier to subtract,
          which is the majority of them. That reads as "the formula is broken" and the column
          it blanks is the one it was built for.

          The idiom is Excel's own: the AGGREGATE functions skip blanks, so `SUM({b}, 0)` is
          "b, or nothing at all". Shown ALWAYS, not folded into the function list under
          `showFormulaHelp` — a list of 30 names is reference, and this is the one sentence
          that changes what somebody types. Kept to one line (DESIGN.md §4).
        */}
        <div className="cg-field-hint cg-formula-blank-hint">
          A blank in any part blanks the whole result. Wrap an optional column as{" "}
          {"SUM({field}, 0)"} to read it as zero.
        </div>
        {formulaText.trim() !== "" && formulaError ? (
          <div className="cg-field-hint cg-formula-error">{formulaError}</div>
        ) : showFormulaHelp ? (
          <div className="cg-field-hint">
            Excel-style: numbers, text in quotes, {"{field}"} references, + − × ÷ ^ &amp; ( ),
            IF · AND · OR · SUM · AVERAGE · COUNT · MIN · MAX · ROUND(UP/DOWN) · ABS · MOD ·
            SQRT · CONCATENATE · LEFT · RIGHT · MID · LEN · TRIM · UPPER · LOWER · PROPER ·
            TEXT · VALUE · TODAY · DAYS · YEAR · MONTH · DAY · IFERROR · ISBLANK.
            Errors show a blank cell.
          </div>
        ) : null}
      </>
    );
  }
  if (kind === "rating") {
    return (
      <label>
        <span>Number of stars</span>
        <input
          id={`${idPrefix}-rating-max`}
          className="cg-input cg-rating-max"
          type="number"
          min={2}
          max={10}
          value={maxValue}
          aria-label="Number of stars"
          onChange={(event) => {
            const n = Math.round(Number(event.target.value));
            onMaxValue(Number.isFinite(n) ? Math.max(2, Math.min(10, n)) : 5);
          }}
        />
      </label>
    );
  }
  if (kind === "code") {
    // ⭐ Wave-27 item 13 (R13) — the create form's only code-specific question. The hint is not
    // decoration: "code" in a product that also runs automations invites the assumption that
    // picking a language makes the snippet executable, and R13 is explicit that there is no
    // execution engine. Saying so at the moment of choosing is cheaper than a support answer.
    return (
      <label>
        <span>Language</span>
        <select
          id={`${idPrefix}-code-language`}
          className="cg-select"
          value={codeLanguage}
          aria-label="Code language"
          onChange={(event) => onCodeLanguage(event.target.value)}
        >
          {CODE_LANGUAGES.map((lang) => (
            <option key={lang} value={lang}>
              {CODE_LANGUAGE_LABELS[lang]}
            </option>
          ))}
        </select>
        <span className="cg-field-hint">
          Chooses how the snippet is coloured. It is never run.
        </span>
      </label>
    );
  }
  if (kind === "created_time") {
    return (
      <div className="cg-field-hint">
        Read-only. When the record was created in the source system.
      </div>
    );
  }
  if (kind === "automation") {
    // C5-AUTOFIELD — the field's GEAR. An automation column has no value the user types, so
    // this pane configures what a RUN does instead: which job, and which column carries the
    // thing it reads. The schedule and the Run-now button are NOT here — they belong to the
    // automation itself, on the Automation surface, because one job can fill a column across
    // many records and its cadence is a property of the job, not of the column.
    const urlish = fields.filter((f) => f.type === "url" || f.type === "text");
    const chosen = AUTOMATION_KINDS.find((k) => k.key === automationKind)
      ?? AUTOMATION_KINDS[0];
    return (
      <>
        <label>
          <span>What it reads</span>
          <select
            id={`${idPrefix}-automation-kind`}
            className="cg-input"
            value={automationKind}
            aria-label="Automation kind"
            onChange={(event) => onAutomationKind?.(event.target.value)}
          >
            {AUTOMATION_KINDS.map((k) => (
              <option key={k.key} value={k.key}>
                {k.label}
              </option>
            ))}
          </select>
        </label>
        <label>
          <span>URL column</span>
          <select
            id={`${idPrefix}-automation-url`}
            className="cg-input"
            value={automationUrlField}
            aria-label="URL column"
            onChange={(event) => onAutomationUrlField?.(event.target.value)}
          >
            <option value="">Choose a column…</option>
            {urlish.map((f) => (
              <option key={f.key} value={f.key}>
                {f.label}
              </option>
            ))}
          </select>
        </label>
        <div className="cg-field-hint">{chosen.hint}</div>
        <div className="cg-field-hint">
          Cells here are written by the run and cannot be typed into — a value you entered
          would be replaced by the next run without saying so.
        </div>
        {/* A v1 LIMIT, said out loud rather than discovered. The column can be created on any
            table, but an Instagram automation only accepts a blank database as its target
            (`clean_config('field_instagram')`), because the run writes rows and an Odoo-sourced
            table is read-only at the source. Without this line a user creates the column on
            Customer, goes to Automation, and finds no way to point anything at it. */}
        <div className="cg-field-hint">
          Runs target a blank database. On a connector-backed table this column can be created
          but no automation can write to it yet.
        </div>
      </>
    );
  }
  if (kind === "link") {
    // ⭐ 2026-08-07 — Airtable's "Link to another record", and the whole editor is ONE question:
    // which database. The relation itself is then the cell (a set of linked rows).
    return (
      <>
        <label>
          <span>Database</span>
          <select
            id={`${idPrefix}-link-table`}
            className="cg-input"
            value={linkTable}
            aria-label="Database to link to"
            onChange={(event) => onLinkTable?.(event.target.value)}
          >
            <option value="">Choose a database…</option>
            {linkTargets.map((t) => (
              <option key={t.key} value={t.key}>{t.label}</option>
            ))}
          </select>
        </label>
        {linkTargets.length === 0 ? (
          <div className="cg-field-hint">
            There is no other database to link to yet. Create one first, then come back.
          </div>
        ) : null}
        <label className="cg-cond-line">
          <input
            type="checkbox"
            checked={linkSingle}
            aria-label="Allow only one linked record"
            onChange={(event) => onLinkSingle?.(event.target.checked)}
          />
          <span>Allow only one linked record</span>
        </label>
        <div className="cg-field-hint">
          A cell here holds the records you pick. Add a Rollup column afterwards to summarise a
          column of those records — an average, a total, a count.
        </div>
      </>
    );
  }
  if (kind === "rollup") {
    // ⭐ 2026-08-07 — Airtable's rollup, plus the LAST-N window Airtable does not have.
    //
    // The editor reads as the sentence the column answers, in order: through WHICH relation, over
    // WHICH column, folded HOW, and across WHICH records. That last control is the owner's
    // headline ("average Views over last N posts") and Airtable cannot express it — its rollup
    // conditions filter by predicate, never by rank.
    const linkFields = fields.filter((f) => f.type === "link");
    const chosenLink = linkFields.find((f) => f.key === rollupLink);
    const target = linkTargets.find((t) => t.key === chosenLink?.link?.table);
    const targetFields = target?.fields ?? [];
    // ⛔ COUNTALL IS THE ONE FUNCTION WITH NO SOURCE COLUMN — it counts linked RECORDS, so the
    // field picker would be a control that configures nothing. Airtable's rule, and ours.
    const needsField = rollupFn !== "countall";
    // ⭐⭐ 2026-08-09 — THE SECOND KIND OF ROLLUP. Everything above summarises rows that live in
    // this workspace; a SOURCE rollup summarises rows that were never copied here — one grouped
    // SQL query over the governed Odoo model answers every parent row at once. That is the only
    // way a column can total 256,810 order lines, which is 4x what a database here may hold.
    const sourceTopics = rollupSourceOffer.topics;
    const topic = sourceTopics.find((t) => t.key === rollupSource.topic);
    const dim = topic?.dims.find((d) => d.key === rollupSource.groupBy);
    const setSource = (patch: Partial<RollupSource>) =>
      onRollupSource?.({ ...rollupSource, ...patch });
    // ⚠ A join column must hold a SCALAR the group key can equal. Link and rollup columns hold a
    // comma-joined id list and a computed value respectively, so neither can ever match.
    const joinable = fields.filter(
      (f) => f.type !== "link" && f.type !== "rollup" && f.key !== "__proto__"
    );
    const sourceEditor = (
      <>
        <label>
          <span>Odoo data</span>
          <select
            id={`${idPrefix}-rollup-topic`}
            className="cg-input"
            value={rollupSource.topic}
            aria-label="Odoo topic"
            onChange={(event) =>
              // ⛔ CLEAR THE MEASURE AND THE DIM WITH THE TOPIC. Both are keys OF the topic, so
              // carrying them across a topic change leaves a bag naming a measure the new topic
              // does not have — which the save door refuses, on a form that looks complete.
              setSource({ topic: event.target.value, measure: "", groupBy: "" })
            }
          >
            <option value="">Choose what to summarise…</option>
            {sourceTopics.map((t) => (
              <option key={t.key} value={t.key}>{t.label}</option>
            ))}
          </select>
        </label>
        {sourceTopics.length === 0 ? (
          <div className="cg-field-hint">
            No live data sources are available for this workspace. A source rollup reads a
            connected system; this one has none connected yet.
          </div>
        ) : null}
        {topic ? (
          <>
            <label>
              <span>Measure</span>
              <select
                id={`${idPrefix}-rollup-measure`}
                className="cg-input"
                value={rollupSource.measure}
                aria-label="Measure"
                onChange={(event) => setSource({ measure: event.target.value })}
              >
                <option value="">Choose a measure…</option>
                {topic.measures.map((m) => (
                  <option key={m.key} value={m.key}>{m.label}</option>
                ))}
              </select>
            </label>
            <label>
              <span>One row per</span>
              <select
                id={`${idPrefix}-rollup-dim`}
                className="cg-input"
                value={rollupSource.groupBy}
                aria-label="Group by"
                onChange={(event) => setSource({ groupBy: event.target.value })}
              >
                <option value="">Choose a grouping…</option>
                {topic.dims.map((d) => (
                  <option key={d.key} value={d.key}>{d.label}</option>
                ))}
              </select>
            </label>
            <label>
              <span>Matched on</span>
              <select
                id={`${idPrefix}-rollup-on`}
                className="cg-input"
                value={rollupSource.on}
                aria-label="Column to match on"
                onChange={(event) => setSource({ on: event.target.value })}
              >
                <option value="">Choose this database's column…</option>
                {joinable.map((f) => (
                  <option key={f.key} value={f.key}>{f.label}</option>
                ))}
              </select>
            </label>
            {/* ⚠ THE JOIN IS THE ONE THING THE SERVER CANNOT CHECK. It knows the measure exists
                and the dim is groupable; it cannot know that THIS column holds the same kind of
                value the grouping keys by. A wrong match is not an error — it is a column of
                blanks. So the control says which kind of value it needs. */}
            {dim ? (
              <div className="cg-field-hint">
                {dim.keyedBy === "id"
                  ? `Pick the column holding the Odoo ID for ${dim.label.toLowerCase()}. Matching on a name instead leaves every cell blank.`
                  : `Pick the column holding the ${dim.label.toLowerCase()} value itself — this grouping keys by its own value, not by an ID.`}
              </div>
            ) : null}
            <label>
              <span>Over</span>
              <select
                id={`${idPrefix}-rollup-window`}
                className="cg-input"
                value={rollupSource.window || "all_time"}
                aria-label="Date window"
                onChange={(event) => setSource({ window: event.target.value })}
              >
                {rollupSourceOffer.windows.map((w) => (
                  <option key={w.key} value={w.key}>{w.label}</option>
                ))}
              </select>
            </label>
            <div className="cg-field-hint">
              Recomputed against live data — the window moves with today's date rather than
              freezing the dates it was created on.
            </div>
          </>
        ) : null}
      </>
    );
    const linkEditor = (
      <>
        <label>
          <span>Through</span>
          <select
            id={`${idPrefix}-rollup-link`}
            className="cg-input"
            value={rollupLink}
            aria-label="Link column"
            onChange={(event) => onRollupLink?.(event.target.value)}
          >
            <option value="">Choose a link column…</option>
            {linkFields.map((f) => (
              <option key={f.key} value={f.key}>{f.label}</option>
            ))}
          </select>
        </label>
        {linkFields.length === 0 ? (
          <div className="cg-field-hint">
            This database has no link column yet. A rollup summarises records reached through a
            link, so add one of those first.
          </div>
        ) : null}
        <label>
          <span>Fold</span>
          <select
            id={`${idPrefix}-rollup-fn`}
            className="cg-input"
            value={rollupFn}
            aria-label="Rollup function"
            onChange={(event) => onRollupFn?.(event.target.value as RollupFn)}
          >
            {ROLLUP_FNS.map((fn) => (
              <option key={fn} value={fn}>{ROLLUP_FN_LABELS[fn]}</option>
            ))}
          </select>
        </label>
        {needsField ? (
          <label>
            <span>Column</span>
            <select
              id={`${idPrefix}-rollup-field`}
              className="cg-input"
              value={rollupField}
              aria-label="Column to roll up"
              onChange={(event) => onRollupField?.(event.target.value)}
            >
              <option value="">Choose a column…</option>
              {targetFields.map((f) => (
                <option key={f.key} value={f.key}>{f.label}</option>
              ))}
            </select>
          </label>
        ) : null}
        {/*
          ⭐⭐ 2026-08-09 · D-99 — THE STATE THE OWNER'S REPORT DESCRIBES, SAID OUT LOUD.
          Owner: *"if we want to use Rollup field to apply to the related database, it doesn't
          work. Because the linked Field can't be selected yet."*

          ⛔ WHAT IS ACTUALLY REACHABLE HERE, measured rather than guessed. The `Through` picker
          offers EVERY link column — `linkFields` filters on `f.type === "link"` and excludes
          nothing preset, derived or `automation:`-tagged, so the scouted hypothesis ("the picker
          omits preset links") is refuted at source. What CAN happen is one step later: the
          target is resolved out of `linkTargets`, which is `GET /tables` filtered by
          `user_tables.may_open` (creator, admin, or an explicit share). An automation-OWNED child
          dataset is stamped with a machine owner, so for a user who is neither its creator nor an
          admin it is simply ABSENT from that list — and then `targetFields` is `[]`, this Column
          picker holds nothing but its placeholder, and `Add condition` below is disabled.

          ⚠ AND UNTIL NOW IT SAID NOTHING. An empty picker beside a dead button reads as "this
          feature is broken"; it is in fact a permission fact about ONE database, and the fix for
          it is a share, not a bug report. This is the absent-vs-empty third state the automation
          panel already distinguishes ("No view list was offered for that database") — the same
          discipline, applied to the surface that actually got reported.
          ⛔ IT NAMES THE TABLE RATHER THAN APOLOGISING. `chosenLink.link.table` is the key the
          bag points at, and printing it is what turns "it doesn't work" into a thing to go and
          grant.
        */}
        {chosenLink && !target ? (
          <div className="cg-field-hint">
            This link points at <b>{chosenLink.link?.table}</b>, which is not among the databases
            you can open — so its columns cannot be listed here and the conditions below stay
            unavailable. Ask an admin to share that database with you, then reopen this editor.
          </div>
        ) : null}
        {/*
          ⭐⭐ 2026-08-09 (owner) — THE PRE-FILTER, ABOVE THE WINDOW, AND THE SCREEN ORDER IS THE
          ORDER OF OPERATIONS. Owner: *"instead of last 12 posts, we also want to make it so its
          last N record, where the record's Status is video."*

          Everything below this block narrows a set that this block has already chosen:
          include → order → how many → deduplicate → then keep only. Reading top to bottom is
          reading what the server does, in sequence. The post-filter list used to sit HERE, above
          the window it runs after, which is the one arrangement that teaches the wrong model.
        */}
        <RollupConditionList
          idPrefix={`${idPrefix}-rollup-where`}
          title="Include records"
          hint={"Applied BEFORE the window below, so “last 10” counts only records that "
            + "match. View filters never change a Rollup’s result."}
          conditions={rollupWhere}
          onConditions={(v) => onRollupWhere?.(v)}
          conj={rollupWhereConj}
          onConj={(v) => onRollupWhereConj?.(v)}
          targetFields={targetFields}
          allowRef={false}
        />
        <label>
          <span>Across</span>
          <select
            id={`${idPrefix}-rollup-sort`}
            className="cg-input"
            value={rollupSortBy}
            aria-label="Which records to include"
            onChange={(event) => onRollupSortBy?.(event.target.value)}
          >
            <option value="">Every linked record</option>
            {targetFields.map((f) => (
              <option key={f.key} value={f.key}>Most recent by {f.label}</option>
            ))}
          </select>
        </label>
        {rollupSortBy ? (
          <label>
            <span>How many</span>
            <input
              type="number"
              className="cg-input"
              min={1}
              value={rollupLimit || 1}
              aria-label="How many records"
              onChange={(event) =>
                onRollupLimit?.(Math.max(1, Number(event.target.value) || 1))
              }
            />
          </label>
        ) : null}
        <label>
          <span>Deduplicate by</span>
          <select
            id={`${idPrefix}-rollup-distinct`}
            className="cg-input"
            value={rollupDistinctBy}
            aria-label="Deduplicate linked records by"
            onChange={(event) => onRollupDistinctBy?.(event.target.value)}
          >
            <option value="">Keep every linked row</option>
            {targetFields.map((f) => (
              <option key={f.key} value={f.key}>One row per {f.label}</option>
            ))}
          </select>
        </label>
        {/* ⛔ THE RULE STATED AT THE CONTROL, because the server refuses the pair and a refusal
            the user meets after pressing Create is a refusal they had no way to avoid. "The
            last N" with no declared order is not a measurement — it is whichever N rows happen
            to sit first in the store. */}
        <div className="cg-field-hint">
          {rollupSortBy
            ? `The ${rollupLimit || 1} most recent linked records, newest first.`
            : "Every linked record. Choose an order above to summarise just the most recent few."}
        </div>
        {rollupDistinctBy ? (
          <div className="cg-field-hint">
            Duplicate linked rows with the same identity count once; the newest row wins when an
            order is selected.
          </div>
        ) : null}
        {/*
          ⭐⭐ WAVE 28 · C1 — THE POST-FILTER, BELOW THE WINDOW, WHICH IS WHERE IT ALWAYS RAN.
          Only its POSITION on screen moved (2026-08-09), and the move is the point: this list
          selects among the records the window above already kept, so a threshold measured "over
          this set" is measured over exactly those. That is why the σ operators live here and are
          refused in the pre-filter — before the window there is no set for a mean to be about.

          ⚠ THE HINT HOLDS LITERAL CHARACTERS, never `\u`-escapes. It shipped to the live Space
          printing `it kept — which is what a “σ from the mean”` ON SCREEN,
          because the escapes were written with a DOUBLED backslash and the JS string then had
          nothing left to interpret. `tsc` is happy — a wrong string is valid TypeScript — and no
          gate reads prose. It was caught by opening the deployed pane and LOOKING at it
          ([[ui-invisible-to-assertions]]).
        */}
        <RollupConditionList
          idPrefix={`${idPrefix}-rollup-cond`}
          title="Then keep only"
          hint={"Applied AFTER the window above, over exactly the records it kept — which is "
            + "what a “σ from the mean” threshold is measured against."}
          conditions={rollupConditions}
          onConditions={(v) => onRollupConditions?.(v)}
          conj={rollupConditionConj}
          onConj={(v) => onRollupConditionConj?.(v)}
          targetFields={targetFields}
          allowRef
        />
        <div className="cg-field-hint">
          Computed for you and refreshed as the linked records change — the cell cannot be typed
          into.
        </div>
      </>
    );
    // ⛔ THE MODE SWITCH RENDERS ONLY WHEN THERE IS A CHOICE TO MAKE. On a workspace with no
    // connected source the offer is empty, and a two-way toggle whose second option can never
    // work is a control that configures nothing ([[wrong-parent-not-broken-control]]). The link
    // editor is then simply what a rollup is, exactly as it was before this existed.
    if (!sourceTopics.length) return linkEditor;
    return (
      <>
        <label>
          <span>Summarise</span>
          <select
            id={`${idPrefix}-rollup-mode`}
            className="cg-input"
            value={rollupMode}
            aria-label="What this rollup summarises"
            onChange={(event) => onRollupMode?.(event.target.value as "link" | "source")}
          >
            <option value="link">Records in this workspace</option>
            <option value="source">Live Odoo data</option>
          </select>
        </label>
        <div className="cg-field-hint">
          {rollupMode === "source"
            ? "Answered straight from the source — it can total hundreds of thousands of rows because none of them are copied into this database."
            : "Folds the records a link column reaches, which must already exist in this workspace."}
        </div>
        {rollupMode === "source" ? sourceEditor : linkEditor}
      </>
    );
  }
  return null;
}

export default function ColumnMenu({
  state,
  field,
  fields,
  linkTargets = [],
  rollupSourceOffer = { topics: [], windows: [] },
  locked,
  schemaLocked = false,
  viewer,
  sortedDir,
  isFiltered,
  isGrouped,
  groupable,
  onClose,
  onNote,
  onHide,
  onCreate,
  onChangeField,
  onCreateAndSwap,
  onProfileFlag,
  onRetype,
  onFieldConfig,
  onRename,
  onFormula,
  initialPosition,
  initialPane,
  scopeChoice = false,
  pinnedTo = false,
  onPinTo,
  onUnpin,
  onPeriod,
  onDelete,
  onDuplicate,
  onPermissions,
  onFormat,
  onAggregate,
  onSort,
  onClearSort,
  onFilterBy,
  onClearFilter,
  onGroupByField,
  onClearGroup,
  userOptions = [],
  measures = [],
}: ColumnMenuProps) {
  const [pane, setPane] = useState<MenuPane>(schemaLocked ? "menu" : initialPane ?? "menu");
  const [note, setNote] = useState(field.note ?? "");
  const [position, setPosition] = useState<CreatePosition | null>(initialPosition ?? null);
  /** Delete is DESTRUCTIVE (a custom field's stored values go with it) — first click arms,
   *  second click fires. Reopening the menu disarms (state is per-mount, keyed by field). */
  const [confirmDelete, setConfirmDelete] = useState(false);
  const [label, setLabel] = useState("");
  /** Whether the user has typed their own name — an auto-suggested measure label must never
   *  overwrite one, but should keep tracking the measure/window until they do. */
  const [labelTouched, setLabelTouched] = useState(false);
  const [kind, setKind] = useState<CreateKind>("text");
  const [createOptionDrafts, setCreateOptionDrafts] = useState<OptionDraft[]>(() =>
    optionDrafts(DEFAULT_OPTION_LABELS)
  );
  const [createColorCode, setCreateColorCode] = useState(true);
  const [measureKey, setMeasureKey] = useState(measures[0]?.key ?? "");
  const [measureWindow, setMeasureWindow] = useState<WindowSpec>(DEFAULT_MEASURE_WINDOW);
  /** Wave-5 item 9/11 — the create form's formula source and rating star count. */
  const [formulaText, setFormulaText] = useState("");
  const [maxValue, setMaxValue] = useState(5);
  /** ⭐ Wave-27 item 13 (R13) — the create form's code LANGUAGE. Seeded to `plain`, which is
   *  also what an absent bag means, so creating without touching this stores nothing extra. */
  const [codeLanguage, setCodeLanguage] = useState<string>("plain");
  /** C5-AUTOFIELD — the create form's automation config. */
  const [automationKind, setAutomationKind] = useState(AUTOMATION_KINDS[0].key);
  const [automationUrlField, setAutomationUrlField] = useState(
    () => fields.find((f) => f.type === "url")?.key ?? ""
  );
  /**
   * ⭐ 2026-08-07 — the create form's LINK and ROLLUP configuration.
   *
   * ⛔ BOTH KINDS ARE UNCREATABLE WITHOUT THEIR BAG — `core.user_tables._clean_field` returns
   * None for a `link` with no `link` bag and for a `rollup` with no `rollup` bag — so `canCreate`
   * gates on these below rather than letting the server refuse a column the user just named.
   * That refusal would be silent in the worst way: created, named, configured, gone on reload.
   */
  const [linkTable, setLinkTable] = useState("");
  const [linkSingle, setLinkSingle] = useState(false);
  /** ⭐ 2026-08-09 — the read-through half. `rollupMode` decides which bag `extraFor` builds;
   *  the two are mutually exclusive because the host's `_clean_rollup` returns the `source`
   *  shape before it ever reads `link`. */
  const [rollupMode, setRollupMode] = useState<"link" | "source">("link");
  const [rollupSource, setRollupSource] = useState<RollupSource>({
    topic: "", measure: "", groupBy: "", on: "", window: "ytd",
  });
  const [rollupLink, setRollupLink] = useState("");
  const [rollupField, setRollupField] = useState("");
  const [rollupFn, setRollupFn] = useState<RollupFn>("sum");
  /** 0 = every linked record (Airtable's only behaviour). Non-zero needs a sort — see below. */
  const [rollupLimit, setRollupLimit] = useState(0);
  const [rollupSortBy, setRollupSortBy] = useState("");
  const [rollupDistinctBy, setRollupDistinctBy] = useState("");
  const [rollupWhere, setRollupWhere] = useState<RollupCondition[]>([]);
  const [rollupWhereConj, setRollupWhereConj] = useState<"and" | "or">("and");
  const [rollupConditions, setRollupConditions] = useState<RollupCondition[]>([]);
  const [rollupConditionConj, setRollupConditionConj] = useState<"and" | "or">("and");
  const [swapTo, setSwapTo] = useState("");
  /** The "New field" half of Change-field keeps its own name/options — a half-typed insert
   *  form must not leak into a swap and vice versa. */
  const [swapLabel, setSwapLabel] = useState("");
  const [swapOptionDrafts, setSwapOptionDrafts] = useState<OptionDraft[]>(() =>
    optionDrafts(DEFAULT_OPTION_LABELS)
  );
  const [swapColorCode, setSwapColorCode] = useState(true);
  const [swapFormulaText, setSwapFormulaText] = useState("");
  const [swapMaxValue, setSwapMaxValue] = useState(5);
  /** ⭐ Wave-27 item 13 (R13) — the swap form's OWN language draft. It gets one rather than
   *  reading the create form's, because `extraFor` used to close over the create drafts and the
   *  swap path passes its own `src`/`starCount` in for exactly that reason: two forms sharing a
   *  draft means changing a language in one silently changes what the other will save. */
  const [swapCodeLanguage, setSwapCodeLanguage] = useState<string>("plain");
  /** Item 8c — the period DRAFT. null = untouched (the field's own window shows). Buffered
   *  behind an Apply rather than emitted per keystroke: a custom range is typed one date at a
   *  time, and each emit is a full host round trip that would repaint the column half-ready. */
  const [periodDraft, setPeriodDraft] = useState<WindowSpec | null>(null);
  /** Permissions pane draft. */
  const [permDraft, setPermDraft] = useState<"everyone" | "creator" | "admins">(
    field.permissions?.edit ?? "everyone"
  );
  /** Format pane draft — seeded from the field, saved whole. */
  const [fmtDraft, setFmtDraft] = useState<FieldFormat>(() => ({ ...(field.format ?? {}) }));
  /** Item 9c — the create forms' Scope draft. 'cohort' is the DEFAULT per the contract. */
  const [scopeDraft, setScopeDraft] = useState<FieldScope>("cohort");
  /** The Edit pane's NAME draft, seeded from the current label (wave-6 item 5's rename,
   *  re-homed into the Edit-field pane by owner item 8). */
  const [renameDraft, setRenameDraft] = useState(field.label);
  /** Owner item 8 — the Edit pane's TYPE draft plus the per-type config drafts: options
   *  prefilled from the field (a select retyped to multi select keeps its choices), star
   *  count from the field's own max, formula source from the field's own source. */
  const [editType, setEditType] = useState<FieldType>(field.type);
  const [editOptionDrafts, setEditOptionDrafts] = useState<OptionDraft[]>(() =>
    optionDrafts(
      choiceOptions(field).length ? choiceOptions(field) : DEFAULT_OPTION_LABELS,
      field.optionColors
    )
  );
  /** Item 15 (C-RENAME) — what each option ROW said when the editor opened, by draft id. A ref,
   *  not state: it is the fixed point the renames are measured against and it must not move
   *  while the user types. Seeded from the same call that seeds the drafts, so the two cannot
   *  disagree about which row is which. */
  const editOptionOrigin = useRef<Map<string, string>>(new Map());
  if (editOptionOrigin.current.size === 0 && editOptionDrafts.length)
    editOptionOrigin.current = new Map(
      editOptionDrafts.map((draft) => [draft.id, draft.label.trim()])
    );
  const [editColorCode, setEditColorCode] = useState(field.colorCodeOptions !== false);
  const [retypeMaxValue, setRetypeMaxValue] = useState(() => ratingMax(field));
  const [editFormulaText, setEditFormulaText] = useState(() =>
    typeof field.formula === "string" ? field.formula : ""
  );
  /** C5-AUTOFIELD — the Edit pane's automation drafts, seeded from the field's own config. */
  const [editAutomationKind, setEditAutomationKind] = useState(
    () => field.automation?.kind ?? AUTOMATION_KINDS[0].key
  );
  const [editAutomationUrlField, setEditAutomationUrlField] = useState(
    () => field.automation?.urlField ?? ""
  );
  /** ⭐ Wave-27 item 13 (R13) — the Edit pane's language draft, seeded from the field's own bag
   *  through the shared resolver (never `field.code!.language`: an unconfigured code column is
   *  the common case, and `codeLanguageOf` is the one place that answers what absent means). */
  const [editCodeLanguage, setEditCodeLanguage] = useState<string>(() => codeLanguageOf(field));
  /**
   * ⭐⭐ 2026-08-09 (owner) — THE EDIT PANE'S OWN RELATIONAL DRAFT, seeded from the field's bag.
   *
   * Owner: *"even when i click edit field for rollup, it doesn't actually show me the
   * configuration that I use to generate it, it only shows change to a different field."*
   * Exactly right, and it was worse than missing: `RETYPE_TYPES` includes `rollup`, so the pane
   * offered a type picker whose "Rollup" option would re-save the column with NO bag.
   *
   * ⛔ ONE OBJECT, NOT TWELVE `useState`s, and the reason is seeding. Every draft here must start
   * as what the STORE holds — a pane that opens on defaults and then saves them is a pane that
   * silently rewrites a working column the moment somebody opens it to look. One object seeded
   * once from `field.rollup` makes "opened but unchanged" literally equal to the stored bag, so
   * the dirty check below is an object comparison rather than twelve remembered pairs.
   */
  type RollupBag = NonNullable<Field["rollup"]>;
  const [editRollup, setEditRollup] = useState<RollupBag>(() => ({ ...(field.rollup ?? {}) }));
  const patchEditRollup = (patch: Partial<RollupBag>) =>
    setEditRollup((current) => {
      const next = { ...current, ...patch } as RollupBag;
      // ⛔ AN EMPTY LIST IS AN ABSENT KEY, matching what `extraFor` sends on the create path and
      // what `_clean_rollup` stores. Otherwise "remove the last condition" would save
      // `conditions: []` while the stored bag has no such key, and the column would read as
      // dirty forever.
      for (const key of ["where", "conditions"] as const) {
        if (Array.isArray(next[key]) && next[key]!.length === 0) {
          delete next[key];
          delete next[key === "where" ? "whereConj" : "conditionConj"];
        }
      }
      if (!next.sortBy) {
        // The server refuses a limit with no declared order; dropping both together keeps the
        // draft in a shape that can always be saved.
        delete next.limit;
        delete next.sortDir;
      }
      return next;
    });
  const [editLinkTable, setEditLinkTable] = useState(() => field.link?.table ?? "");
  const [editLinkSingle, setEditLinkSingle] = useState(() => field.link?.single === true);

  const swapToNewType = swapTo.startsWith(NEW_PREFIX)
    ? (swapTo.slice(NEW_PREFIX.length) as FieldType)
    : null;

  const createChoice = optionSettings(createOptionDrafts, kind);
  const options = createChoice.options;
  const swapChoice = swapToNewType
    ? optionSettings(swapOptionDrafts, swapToNewType)
    : { options: [] as string[], colors: {} as Record<string, string> };
  const swapNewOptions = swapChoice.options;
  /** Owner item 8 — the Edit pane's parsed choices for the drafted type. */
  const editChoice = optionSettings(editOptionDrafts, editType);
  const editOptions = editChoice.options;

  // Wave-5 item 9, amended 2026-07-31 (owner item 2) — live formula validation for BOTH
  // create surfaces. Refs may now name OTHER formula fields (evaluation is topological);
  // what is refused is a CYCLE, checked against every formula's SOURCE. Both surfaces here
  // CREATE a field, so no cycle is possible yet and no selfKey is passed — the retype path
  // (in-place formula edit) would pass the edited field's key.
  const knownKeys = useMemo(
    () => new Set(fields.filter((f) => f.type !== "formula").map((f) => f.key)),
    [fields]
  );
  const formulaSources = useMemo(() => {
    const out = new Map<string, string>();
    for (const f of fields) {
      if (f.type !== "formula") continue;
      const src = typeof f.formula === "string" ? f.formula : "";
      if (src) out.set(f.key, src);
    }
    return out;
  }, [fields]);
  const formulaCheck = useMemo(
    () =>
      formulaText.trim() === ""
        ? { ok: false, error: "Type a formula", refs: [] as string[] }
        : validateFormula(formulaText, knownKeys, formulaSources),
    [formulaText, knownKeys, formulaSources]
  );
  const swapFormulaCheck = useMemo(
    () =>
      swapFormulaText.trim() === ""
        ? { ok: false, error: "Type a formula", refs: [] as string[] }
        : validateFormula(swapFormulaText, knownKeys, formulaSources),
    [swapFormulaText, knownKeys, formulaSources]
  );

  const chosenMeasure = measures.find((m) => m.key === measureKey);
  /** The suggested name reads as the sentence the column answers: "Sales · the last 90 days". */
  const suggestedLabel = chosenMeasure
    ? `${chosenMeasure.label} · ${windowLabel(measureWindow)}`
    : "";
  const effectiveLabel =
    kind === "measure" && !labelTouched && !label.trim() ? suggestedLabel : label;

  // A select with no choices is a column nothing can ever be put in, so creation is blocked
  // until it has at least one. An assignee takes its choices from the host, not from here.
  // A measure column needs a measure; a formula column needs a formula that PARSES — an
  // unparseable formula would be a permanently blank column, refused here rather than shipped.
  const canCreate =
    effectiveLabel.trim() !== "" &&
    (!needsOptions(kind) || options.length > 0) &&
    (kind !== "measure" || !!chosenMeasure) &&
    (kind !== "formula" || formulaCheck.ok) &&
    // C5-AUTOFIELD: an automation column with no URL column to read is a column no run can
    // ever fill — the same "permanently blank column" the formula rule above refuses, so it
    // is refused here rather than created and then discovered.
    (kind !== "automation" || automationUrlField !== "") &&
    // ⭐ 2026-08-07 — both relational kinds are UNCREATABLE without their bag: `_clean_field`
    // returns None for a `link` with no target and a `rollup` with no link/function, so
    // creating one without this gate produces a column that is named, configured and simply
    // absent on the next read. The same "permanently blank column" argument as the two rules
    // above, one step worse — the column does not exist at all.
    (kind !== "link" || linkTable !== "") &&
    (kind !== "rollup" || (rollupMode === "source"
      // ⭐ 2026-08-09 — the read-through bag. ALL FOUR keys are required by `_clean_rollup`
      // (`if not (topic and measure and group_by and on): return None`), and `on` is the one a
      // user forgets: without it the bag names a real measure grouped a real way with nothing
      // to match it to any row, and the field would be refused after Create.
      ? (rollupSource.topic !== "" && rollupSource.measure !== "" &&
         rollupSource.groupBy !== "" && rollupSource.on !== "")
      : (
        rollupLink !== "" &&
        (rollupFn === "countall" || rollupField !== "") &&
        // `latest` without an order is store order wearing a deterministic name.
        (rollupFn !== "latest" || rollupSortBy !== "")
      )));

  const extraFor = (
    t: CreateKind,
    src: string,
    starCount: number,
    lang: string
  ): FieldConfigExtra | undefined => {
    if (t === "formula") return { formula: src.trim() };
    if (t === "rating") return { max: starCount };
    // ⭐ Wave-27 item 13 (R13). The bag is ALWAYS sent, including `plain` — the host's
    // `_clean_code` evaluates plain to None and therefore CLEARS the key, which is what makes
    // "switch this column back to Plain text" a change that saves. Omitting it instead would
    // inherit the previous language (the patch path's omit-means-keep rule).
    if (t === "code") return { code: { language: lang } };
    if (t === "automation")
      return {
        automation: {
          kind: automationKind,
          source: "record_url_field",
          urlField: automationUrlField,
        },
      };
    // ⭐ 2026-08-07 — the relational bags, shaped exactly as `_clean_link` / `_clean_rollup`
    // store them. ⚠ NO `on` KEY: a link created from this menu is an ORDINARY one (the user
    // picks records). The DERIVED mode is the automation's, spawned with its join declared —
    // offering "join on a column of the other table" here would be a second, harder mental
    // model for the same button.
    if (t === "link") return { link: { table: linkTable, ...(linkSingle ? { single: true } : {}) } };
    if (t === "rollup" && rollupMode === "source")
      // ⛔ THE SOURCE BAG TRAVELS ALONE. `_clean_rollup` reads `source` first and returns
      // immediately, so sending `link`/`fn` alongside it would ship keys the store drops —
      // harmless today and exactly the kind of dead payload that later reads as configuration.
      return {
        rollup: {
          source: {
            topic: rollupSource.topic,
            measure: rollupSource.measure,
            groupBy: rollupSource.groupBy,
            on: rollupSource.on,
            // ⚠ `all_time` is sent as an ABSENT window, which is what it means: the validator
            // accepts the literal too, but the bag is smaller and reads as "no window".
            ...(rollupSource.window && rollupSource.window !== "all_time"
              ? { window: rollupSource.window }
              : {}),
          },
        },
      };
    if (t === "rollup")
      return {
        rollup: {
          link: rollupLink,
          ...(rollupFn === "countall" ? {} : { field: rollupField }),
          fn: rollupFn,
          // ⛔ `limit` AND `sortBy` TRAVEL TOGETHER OR NEITHER TRAVELS. The host refuses a limit
          // with no declared order, so sending one would turn a valid-looking form into a 400.
          ...(rollupSortBy
            ? { sortBy: rollupSortBy, sortDir: "desc" as const,
                limit: rollupLimit || 1 }
            : {}),
          ...(rollupDistinctBy ? { distinctBy: rollupDistinctBy } : {}),
          // ⛔ EACH LIST TRAVELS WITH ITS OWN CONJUNCTION OR NEITHER TRAVELS — `_clean_rollup`
          // stores the pair together, so sending a conj with no list would be a stored key
          // nothing reads, and a list with no conj would take the server's default rather than
          // the one this editor showed.
          ...(rollupWhere.length
            ? { where: rollupWhere, whereConj: rollupWhereConj }
            : {}),
          ...(rollupConditions.length
            ? { conditions: rollupConditions, conditionConj: rollupConditionConj }
            : {}),
        },
      };
    return undefined;
  };
  const optionExtraFor = (
    t: CreateKind,
    colors: Record<string, string>,
    colorCode: boolean
  ): FieldConfigExtra =>
    needsOptions(t)
      ? {
          colorCodeOptions: colorCode,
          ...(Object.keys(colors).length ? { optionColors: colors } : {}),
        }
      : {};
  /** Item 9c — the Scope choice rides the create extras only where the page offers it. */
  const withScope = (e?: FieldConfigExtra): FieldConfigExtra | undefined =>
    scopeChoice ? { ...(e ?? {}), scope: scopeDraft } : e;

  const create = () => {
    const clean = effectiveLabel.trim();
    if (!clean || !position || !canCreate) return;
    if (kind === "measure") {
      if (!chosenMeasure) return;
      onCreate(clean, chosenMeasure.type, position === "end" ? null : field.key, position,
               undefined, { key: chosenMeasure.key, window: measureWindow },
               withScope(undefined));
      onClose();
      return;
    }
    onCreate(clean, kind, position === "end" ? null : field.key, position,
             needsOptions(kind) ? options : undefined, undefined,
             withScope({
               ...extraFor(kind, formulaText, maxValue, codeLanguage),
               ...optionExtraFor(kind, createChoice.colors, createColorCode),
             }));
    onClose();
  };

  const canCreateSwap =
    swapToNewType != null &&
    swapLabel.trim() !== "" &&
    (!needsOptions(swapToNewType) || swapNewOptions.length > 0) &&
    (swapToNewType !== "formula" || swapFormulaCheck.ok);

  const createAndSwap = () => {
    if (!swapToNewType || !canCreateSwap) return;
    onCreateAndSwap(
      swapLabel.trim(),
      swapToNewType,
      needsOptions(swapToNewType) ? swapNewOptions : undefined,
      withScope({
        ...extraFor(swapToNewType, swapFormulaText, swapMaxValue, swapCodeLanguage),
        ...optionExtraFor(swapToNewType, swapChoice.colors, swapColorCode),
      })
    );
    onClose();
  };

  // ------------------------------------------------------- owner item 8: Edit-field dirties
  // ONE Save applies whatever changed — name, type, choices, stars, formula source — and it
  // must leave as ONE upsert when several changed together: sequential emits each read the
  // stale def and the second reverts the first (label rides extra.label / onFormula's label).
  const cleanRename = renameDraft.trim();
  // ⭐ 2026-08-09 — `onFieldConfig` is a SECOND door that can rename. `onRename` writes the
  // per-user overlay and is supplied for `custom_` fields only, so a pre-set Rollup — now
  // reconfigurable by owner ruling — had a configuration it could change and a name it could
  // not. Both ride the same PATCH; the label is part of the definition either way.
  const editNameDirty =
    (!!onRename || !!onFieldConfig) && cleanRename !== "" && cleanRename !== field.label;
  const editOptionsChanged =
    needsOptions(editType) &&
    editOptions.join("\n") !== choiceOptions(field).join("\n");
  const editAppearanceChanged =
    needsOptions(editType) &&
    (editColorCode !== (field.colorCodeOptions !== false) ||
      optionAppearanceSignature(editOptions, editChoice.colors) !==
        optionAppearanceSignature(choiceOptions(field), field.optionColors));
  const editStarsChanged = editType === "rating" && retypeMaxValue !== ratingMax(field);
  /** The type half was touched: a different type, or the SAME type with edited choices/stars
   *  (the owner's named case — "change the list of the single selections"). */
  /** C5-AUTOFIELD — the automation config is a property of the column exactly as the choice
   *  list is, so a change to it makes the type half DIRTY and rides the same one upsert. */
  const editAutomationChanged =
    editType === "automation" &&
    field.type === "automation" &&
    (editAutomationKind !== (field.automation?.kind ?? AUTOMATION_KINDS[0].key) ||
      editAutomationUrlField !== (field.automation?.urlField ?? ""));
  const editRetypeTouched =
    onRetype != null &&
    (editType !== field.type || editOptionsChanged || editAppearanceChanged ||
      editStarsChanged || editAutomationChanged);
  const editRetypeValid =
    (!needsOptions(editType) || editOptions.length > 0) &&
    (editType !== "automation" || editAutomationUrlField !== "");
  const editFormulaCheck = useMemo(
    () =>
      editFormulaText.trim() === ""
        ? { ok: false, error: "Type a formula", refs: [] as string[] }
        : validateFormula(editFormulaText, knownKeys, formulaSources, field.key),
    [editFormulaText, knownKeys, formulaSources, field.key]
  );
  const editFormulaTouched =
    !!onFormula &&
    field.type === "formula" &&
    editFormulaText.trim() !==
      (typeof field.formula === "string" ? field.formula.trim() : "");
  // A touched-but-invalid half BLOCKS the whole save — otherwise Save would apply the name
  // and silently drop the half-finished type change beside it.
  const editBlocked =
    (editRetypeTouched && !editRetypeValid) ||
    (editFormulaTouched && !editFormulaCheck.ok);
  // Item 21 (2026-08-02) — the PERIOD moved into this pane, so its dirty-check has to be
  // computed before the pane's save gate rather than beside the menu's own button. Same three
  // lines, hoisted: `canSaveEdit` reads `periodChanged`, and a `const` read before its
  // initialiser is a TDZ crash at render, not a compile error.
  const currentWindow = field.measure ? normalizeWindow(field.measure.window) : null;
  const draftWindow = periodDraft ? normalizeWindow(periodDraft) : null;
  const periodChanged =
    draftWindow != null &&
    JSON.stringify(draftWindow) !== JSON.stringify(currentWindow);
  const canPeriod = !!field.measure && !!onPeriod;
  /**
   * ⭐⭐ 2026-08-09 — THE RELATIONAL EDIT: is this pane driving a `link`/`rollup` bag?
   *
   * ⛔ GATED ON `onFieldConfig`, which the host supplies for USER DATABASES ONLY. These bags live
   * in the table's shared definition (`PATCH /tables/{key}/fields/{key}`); there is no such door
   * on the Odoo-backed Customer/Product grids, so offering the editor there would be a form whose
   * Save has nowhere to go.
   */
  const editingRelational =
    !!onFieldConfig && (field.type === "rollup" || field.type === "link");
  const editRollupValid =
    field.type !== "rollup" ||
    (editRollup.source
      ? !!(editRollup.source.topic && editRollup.source.measure &&
           editRollup.source.groupBy && editRollup.source.on)
      : !!editRollup.link &&
        (editRollup.fn === "countall" || !!editRollup.field) &&
        (editRollup.fn !== "latest" || !!editRollup.sortBy));
  const editRelationalTouched =
    editingRelational &&
    (field.type === "rollup"
      ? JSON.stringify(editRollup) !== JSON.stringify(field.rollup ?? {})
      : editLinkTable !== (field.link?.table ?? "") ||
        editLinkSingle !== (field.link?.single === true));
  const canSaveEdit =
    !editBlocked &&
    (editingRelational
      ? (editRollupValid && (editRelationalTouched || editNameDirty) &&
         (field.type !== "link" || editLinkTable !== ""))
      : (editNameDirty || editRetypeTouched || editFormulaTouched ||
         (canPeriod && periodChanged)));
  /**
   * Item 15 — the renames, by ROW IDENTITY. A row that kept its id and changed its label was
   * renamed; a row with an id nobody has seen is new; an id that is gone was deleted. Empty
   * labels are skipped (a row being cleared before it is retyped is not a rename to ""), and a
   * rename to a label that already existed is skipped too — that is a MERGE, and merging two
   * choices into one is a different operation from renaming, with a different answer for the
   * cells that held either.
   */
  const optionRenames = (): { from: string; to: string }[] =>
    // A field that was not a choice field before has no values to migrate, and one being
    // retyped AWAY from choices is a different question (its cells stop being options at all).
    needsOptions(editType) && needsOptions(field.type)
      ? choiceRenames(editOptionDrafts, editOptionOrigin.current, choiceOptions(field))
      : [];
  const applyEdit = () => {
    if (!canSaveEdit) return;
    if (editingRelational && onFieldConfig) {
      // ⛔ THE WHOLE BAG, EVERY SAVE. `_clean_rollup` is a pure cleaner over what it receives —
      // it does not merge with the stored bag — so a partial patch is a REBUILD, and an omitted
      // `limit` would silently become "no limit" rather than "unchanged".
      onFieldConfig({
        ...(editNameDirty ? { label: cleanRename } : {}),
        ...(field.type === "rollup"
          ? { rollup: editRollup as Record<string, unknown> }
          : { link: { table: editLinkTable,
                      ...(editLinkSingle ? { single: true } : {}) } }),
      });
      onClose();
      return;
    }
    if (editRetypeTouched && onRetype) {
      const renames = optionRenames();
      onRetype(
        editType,
        needsOptions(editType) ? editOptions : undefined,
        {
          ...(renames.length ? { renames } : {}),
          ...(editType === "rating" ? { max: retypeMaxValue } : {}),
          // ⭐ Wave-27 item 13 (R13) — always sent for a code column, `plain` included: the
          // host clears the key on plain, so this is what makes the picker reversible.
          ...(editType === "code" ? { code: { language: editCodeLanguage } } : {}),
          ...(needsOptions(editType)
            ? {
                colorCodeOptions: editColorCode,
                ...(Object.keys(editChoice.colors).length
                  ? { optionColors: editChoice.colors }
                  : {}),
              }
            : {}),
          ...(editType === "automation"
            ? {
                automation: {
                  kind: editAutomationKind,
                  source: "record_url_field" as const,
                  urlField: editAutomationUrlField,
                },
              }
            : {}),
          ...(editNameDirty ? { label: cleanRename } : {}),
        }
      );
    } else if (editFormulaTouched && onFormula) {
      onFormula(editFormulaText.trim(), editNameDirty ? cleanRename : undefined);
    } else if (editNameDirty && onRename) {
      onRename(cleanRename);
    }
    // Item 21 — the period is an INDEPENDENT property of a measure column, not a branch of
    // the identity edit, so it applies ALONGSIDE whatever the chain above did rather than
    // instead of it: renaming "Sales YTD" to "Sales" and re-pointing it at the last 90 days
    // is one edit to the user and must not silently drop half of itself.
    if (canPeriod && periodChanged && draftWindow) onPeriod!(draftWindow);
    onClose();
  };

  /**
   * Fields this column can be CHANGED to, split per wave-2 item 5: the "Pre-set fields" group
   * (the shared contract's predicate, `source === 'odoo' && !custom`) versus "Your fields" —
   * the overlay stratum and user-created columns. Hidden fields included in both: "change this
   * to Notes" is the whole point, and swapping BACK to a hidden custom field is the documented
   * restore path. The locked primary column cannot be swapped.
   */
  const swapOptions = fields.filter((f) => f.key !== field.key);
  const presetSwap = swapOptions.filter((f) => f.source === "odoo" && !f.custom);
  const yourSwap = swapOptions.filter((f) => !(f.source === "odoo" && !f.custom));

  // Item 8c — the period draft is valid when it normalizes and differs from what the field
  // already has. Compared through normalizeWindow so `{kind:'ltm'}` and `{kind:'ltm', n:undefined}`
  // read as the same window.
  // ⭐ Wave-23 C8 (owner item 4 / R9) — FIRST in the chain, because it is the most specific true
  // thing about the column and the branches below it were saying something false. An
  // `automation` or `metric` column, and every column an automation SPAWNED (the `automation`
  // tag), is overlay-sourced and non-derived, so it fell through to "Editable overlay field" —
  // which is what the wash now visibly contradicts. ONE line, no second sentence about what an
  // automation is (R13 / DESIGN.md §4): the person reading a column menu is deciding whether to
  // type in it, and "filled by automation" is the whole answer.
  // ⭐ Wave-25 C3/R7 — AHEAD of the machine line, because a profile column is the one cell on
  // the row a person is SUPPOSED to fill, and "filled by automation" would say the opposite. It
  // states the consequence rather than the mechanism: clearing this cell also clears the
  // columns the enrichment wrote, and a person who does not know that reads the wipe as a bug.
  // That is the one fact worth a menu line here (DESIGN.md §4 — never over-explain).
  /**
   * ⭐⭐ 2026-08-10 — WHICH SIDE OF THE RELATION IS THIS? (owner: "a linked field should spawn in
   * both databases")
   *
   * The spawn itself was already there — `user_tables.sync_reciprocal_link` creates the backlink
   * on the target for every ordinary link, and the two engines declare BOTH directions of their
   * derived links themselves. What was missing is the half a user can actually see: three
   * genuinely different columns all rendered as chips of linked rows and all described as
   * "Editable overlay field", including the computed reciprocal, which is not editable at all.
   *
   * The three, and the one fact that separates them:
   *   ordinary    — no `on`, no `inverse`. YOU pick the records. This is the stored truth.
   *   reciprocal  — `inverse` names the source field. Computed from the other side's picks;
   *                 typing here is refused (`is_computed_cell`), so saying "editable" was a lie.
   *   derived     — `on` names a column in the target that already holds this row's key. The
   *                 engine owns it; there is no picking on either side.
   *
   * ⚠ Read through `isDerivedLink`, never a fourth hand-rolled "does the bag have an `on`" —
   * `user_tables`' own note warns that a fourth reader is how one of them keeps answering yes
   * after the others stop.
   * ⚠ AHEAD of `isMachineOwned` for links only. "Filled by automation" is TRUE of a preset
   * derived link and it is the less specific true thing: the reader is deciding whether they can
   * click into this cell and pick something, and which side they are on is that answer.
   */
  const linkTargetLabel =
    field.type === "link"
      ? linkTargets.find((t) => t.key === field.link?.table)?.label ?? ""
      : "";
  const linkSideLine =
    field.type !== "link"
      ? null
      : field.link?.inverse
        ? `Linked from ${linkTargetLabel || "another database"} · rows that point here`
        : isDerivedLink(field)
          ? `Links to ${linkTargetLabel || "another database"} · matched automatically`
          : `Links to ${linkTargetLabel || "another database"} · you pick the records`;
  const typeLineBase = isProfileField(field)
    ? "Instagram profile · clearing it clears the enriched columns"
    : linkSideLine
    ? linkSideLine
    : isMachineOwned(field)
    ? "Filled by automation"
    : field.measure
    ? "Metric, read-only"
    : field.type === "formula"
      ? "Formula field, computed"
      : field.type === "created_time"
        ? "Created time, read-only"
        : field.derived
          ? "Read-only, derived"
          : field.source === "odoo"
            ? "Read-only source field"
            : "Editable overlay field";
  // Item 9c — a cohort-scoped def says so wherever its identity is stated (contract:
  // "defs may come back carrying scope: 'cohort' (label it)").
  const typeLine =
    field.scope === "cohort" ? `${typeLineBase} · this cohort only` : typeLineBase;

  /** Wave-5 item 10 — which format editor this field gets, if any. */
  const formatKind: "number" | "date" | null =
    field.type === "int" || field.type === "currency" || field.type === "formula" ||
    field.type === "pct" || field.type === "rollup"
      ? "number"
      : field.type === "date" || field.type === "created_time"
        ? "date"
        : null;

  /**
   * Item 6 — Insert left/right (and Add at end) jump STRAIGHT to the create form: name + type
   * autofocused, and none of the note/change-field/other-column chrome rendered around it.
   */
  if (position) {
    return (
      <AnchoredOverlay
        anchor={state.anchor}
        className="cg-column-menu"
        onDismiss={onClose}
        role="dialog"
        ariaLabel={
          position === "end" ? "Add field" : `Insert field ${position} of ${field.label}`
        }
        // The SAME selector as the full-menu branch, so React reconciling the two states does
        // not re-run the overlay's focus effect (its deps see one constant) — which would steal
        // focus to the first button a frame after the name input autofocused.
        initialFocus="[data-overlay-autofocus]"
        dataKind="column-menu"
      >
        <PaneHead
          title={
            position === "end"
              ? "Add field"
              : position === "left"
                ? "Insert field left"
                : "Insert field right"
          }
          sub={position === "end" ? "Added as the last column" : `Next to ${field.label}`}
          onClose={onClose}
        />
        <div className="cg-column-create">
          <label>
            <span>Name</span>
            <input
              className="cg-input"
              autoFocus
              data-overlay-autofocus
              value={effectiveLabel}
              onChange={(event) => {
                setLabel(event.target.value);
                setLabelTouched(true);
              }}
              onKeyDown={(event) => event.key === "Enter" && create()}
            />
          </label>
          <div className="cg-type-block">
            <span className="cg-type-title">Field type</span>
            {/* Owner item 8 (2026-07-31): every type wears its own mark — the same TYPE_SHAPES
                glyph its column header wears. A native <option> cannot hold an SVG (the ruling
                iconShapes.ts records), so the control is a find box over a listbox of real
                rows, Airtable-style. The measure row appears exactly when the host offers
                measures — the same availability rule as the filter's measure conditions. */}
            <TypePicker
              value={kind}
              onPick={setKind}
              offerMeasure={measures.length > 0}
            />
          </div>
          {kind === "measure" && (
            <>
              {/* C-NAME — the row asked "Measure"/"Choose a measure…", which named the
                  INTERNAL concept at the user. What the person is picking is the business
                  number ("Sales", "Gross margin"), so the label says that. */}
              <label>
                <span>Number</span>
                {/* Item 20 (C-FLDSEL) — "Choose a number…" was an `<option value="">` that
                    only rendered while nothing was chosen; it is the picker's PLACEHOLDER
                    now, so the prompt is a state of the control rather than a row of the
                    vocabulary that could be picked. */}
                <FieldSelectButton
                  ariaLabel="Number to summarise"
                  placeholder="Choose a number…"
                  value={chosenMeasure ? measureKey : undefined}
                  onChange={setMeasureKey}
                  fields={measures.map((m) => ({
                    key: m.key, label: m.label, type: "measure" as const,
                  }))}
                />
              </label>
              <label>
                <span>Period</span>
                <span className="cg-measure-window">
                  <WindowPicker window={measureWindow} onWindow={setMeasureWindow} />
                </span>
              </label>
              {/* The helper line now carries what the old label's parenthetical was doing —
                  "(over a period)" — plus an example, because "Metric" alone does not say
                  that the answer moves with the window above it. */}
              <div className="cg-field-hint">
                A total, average or count over the period you choose — e.g. Sales, last 90
                days. Computed for every customer, and read-only.
              </div>
            </>
          )}
          <ExtraTypeEditor
            kind={kind}
            fields={fields}
            formulaText={formulaText}
            onFormulaText={setFormulaText}
            formulaError={formulaCheck.ok ? null : formulaCheck.error ?? null}
            maxValue={maxValue}
            onMaxValue={setMaxValue}
            codeLanguage={codeLanguage}
            onCodeLanguage={setCodeLanguage}
            idPrefix="cg-create"
            automationKind={automationKind}
            onAutomationKind={setAutomationKind}
            automationUrlField={automationUrlField}
            onAutomationUrlField={setAutomationUrlField}
            linkTargets={linkTargets}
            linkTable={linkTable}
            onLinkTable={setLinkTable}
            linkSingle={linkSingle}
            onLinkSingle={setLinkSingle}
            rollupMode={rollupMode}
            onRollupMode={setRollupMode}
            rollupSourceOffer={rollupSourceOffer}
            rollupSource={rollupSource}
            onRollupSource={setRollupSource}
            rollupLink={rollupLink}
            onRollupLink={(value) => {
              setRollupLink(value);
              setRollupField("");
              setRollupSortBy("");
              setRollupDistinctBy("");
              // Every condition names a column of the OLD target, so both lists are cleared for
              // the same reason: a leaf pointing at a field the new table does not have is a
              // filter that can only ever match nothing.
              setRollupWhere([]);
              setRollupConditions([]);
            }}
            rollupField={rollupField}
            onRollupField={setRollupField}
            rollupFn={rollupFn}
            onRollupFn={setRollupFn}
            rollupLimit={rollupLimit}
            onRollupLimit={setRollupLimit}
            rollupSortBy={rollupSortBy}
            onRollupSortBy={setRollupSortBy}
            rollupDistinctBy={rollupDistinctBy}
            onRollupDistinctBy={setRollupDistinctBy}
            rollupWhere={rollupWhere}
            onRollupWhere={setRollupWhere}
            rollupWhereConj={rollupWhereConj}
            onRollupWhereConj={setRollupWhereConj}
            rollupConditions={rollupConditions}
            onRollupConditions={setRollupConditions}
            rollupConditionConj={rollupConditionConj}
            onRollupConditionConj={setRollupConditionConj}
          />
          {needsOptions(kind) && (
            <OptionsEditor
              idPrefix="cg-create-option"
              drafts={createOptionDrafts}
              onDrafts={setCreateOptionDrafts}
              colorCode={createColorCode}
              onColorCode={setCreateColorCode}
              type={kind}
            />
          )}
          {kind === "user" && (
            <div className="cg-field-hint">
              {userOptions.length
                ? `${userOptions.length} people can be assigned, from your user list.`
                : "No user list yet, so there is no one to assign."}
            </div>
          )}
          {scopeChoice && <ScopeControl value={scopeDraft} onValue={setScopeDraft} />}
          <div className="cg-form-actions">
            <button
              type="button"
              className="cg-btn cg-btn--primary"
              disabled={!canCreate}
              onClick={create}
            >
              Create field
            </button>
            <button
              type="button"
              className="cg-btn"
              // Opened straight into the form (the header "+")? Cancel means close —
              // there is no action list behind it to fall back to.
              onClick={() => (initialPosition ? onClose() : setPosition(null))}
            >
              Cancel
            </button>
          </div>
        </div>
      </AnchoredOverlay>
    );
  }

  // ------------------------------------------------------------ EDIT FIELD pane (item 8)
  // Owner item 8 (2026-07-31): ONE window owning the field's identity — name, type (with the
  // per-type choices/stars/formula editors), and the Change-field control. Absorbs the former
  // Rename and Change-field panes.
  if (pane === "edit") {
    return (
      <AnchoredOverlay
        anchor={state.anchor}
        className="cg-column-menu"
        onDismiss={onClose}
        role="dialog"
        ariaLabel={`Edit field ${field.label}`}
        initialFocus="[data-overlay-autofocus]"
        dataKind="column-menu"
      >
        <PaneHead title="Edit field" sub={typeLine} onClose={onClose} />
        <div className="cg-column-create">
          {onRename || editingRelational ? (
            <label>
              <span>Name</span>
              <input
                className="cg-input"
                autoFocus
                data-overlay-autofocus
                value={renameDraft}
                onChange={(event) => setRenameDraft(event.target.value)}
                onKeyDown={(event) => event.key === "Enter" && applyEdit()}
              />
            </label>
          ) : (
            <label>
              <span>Name</span>
              <input
                className="cg-input"
                value={field.label}
                disabled
                aria-label="Field name (read-only)"
              />
              <span className="cg-field-hint">
                A source field keeps its name and type from the data source.
              </span>
            </label>
          )}
          {/* C5-AUTOFIELD — an EXISTING automation column edits its CONFIG, not its type.
              ⚠ This guard is load-bearing, not tidiness. `automation` is excluded from
              RETYPE_TYPES (see its note), so rendering the picker for one would show a
              listbox whose current value is not among its options — the failure recorded in
              [[cg-condition-builder-items]], where a control missing its own value silently
              presents the FIRST option as if it were the selection. One Save later the column
              is a different type and its statuses are editable text. */}
          {/*
            ⭐⭐ 2026-08-09 (owner) — AN EXISTING ROLLUP/LINK EDITS ITS CONFIGURATION HERE.

            Owner: *"even when i click edit field for rollup, it doesn't actually show me the
            configuration that I use to generate it, it only shows change to a different field."*
            This branch is that configuration, seeded from the stored bag, and it takes the same
            `ExtraTypeEditor` the create pane uses so the two can never offer different controls
            for the same column.

            ⛔ IT REPLACES THE TYPE PICKER, exactly as `automation` does one branch down, and for
            the sharper version of that reason. `RETYPE_TYPES` contains `rollup`, so the picker
            rendered here would have let Save re-emit the column with no bag — and the host's
            `retypeField` refuses a non-`custom` field outright, so on a pre-set rollup the Save
            button was wired to nothing at all. Changing a rollup INTO another type stays
            available through "Change field" below, which is the door that means "show something
            else in this column".
          */}
          {editingRelational ? (
            <div className="cg-type-block">
              <span className="cg-type-title">
                {field.type === "rollup" ? "Rollup" : "Linked records"}
              </span>
              <ExtraTypeEditor
                kind={field.type}
                fields={fields}
                linkTargets={linkTargets}
                formulaText={editFormulaText}
                onFormulaText={setEditFormulaText}
                formulaError={null}
                maxValue={retypeMaxValue}
                onMaxValue={setRetypeMaxValue}
                codeLanguage={editCodeLanguage}
                onCodeLanguage={setEditCodeLanguage}
                idPrefix="cg-edit"
                linkTable={editLinkTable}
                onLinkTable={setEditLinkTable}
                linkSingle={editLinkSingle}
                onLinkSingle={setEditLinkSingle}
                rollupSourceOffer={rollupSourceOffer}
                rollupMode={editRollup.source ? "source" : "link"}
                // ⛔ A MODE SWITCH REPLACES THE BAG, it does not merge into it. `_clean_rollup`
                // reads `source` first and returns before it ever looks at `link`, so a bag
                // carrying both would ship keys the store silently drops — dead payload that
                // later reads as configuration.
                onRollupMode={(mode) =>
                  setEditRollup(mode === "source"
                    ? { source: { topic: "", measure: "", groupBy: "", on: "", window: "ytd" } }
                    : { link: "", fn: "sum" })
                }
                rollupSource={editRollup.source ?? {
                  topic: "", measure: "", groupBy: "", on: "", window: "ytd",
                }}
                onRollupSource={(source) => patchEditRollup({ source })}
                rollupLink={editRollup.link ?? ""}
                onRollupLink={(value) =>
                  // Same reset the create pane performs: every other key names a column of the
                  // OLD target, and a leaf pointing at a field the new table lacks is a filter
                  // that can only ever match nothing.
                  setEditRollup({ link: value, fn: editRollup.fn ?? "sum" })
                }
                rollupField={editRollup.field ?? ""}
                onRollupField={(value) => patchEditRollup({ field: value })}
                rollupFn={editRollup.fn ?? "sum"}
                onRollupFn={(value) => patchEditRollup({ fn: value })}
                rollupLimit={editRollup.limit ?? 0}
                onRollupLimit={(value) => patchEditRollup({ limit: value })}
                rollupSortBy={editRollup.sortBy ?? ""}
                onRollupSortBy={(value) =>
                  patchEditRollup(value
                    ? { sortBy: value, sortDir: editRollup.sortDir ?? "desc",
                        limit: editRollup.limit || 1 }
                    : { sortBy: "" })
                }
                rollupDistinctBy={editRollup.distinctBy ?? ""}
                onRollupDistinctBy={(value) => patchEditRollup({ distinctBy: value })}
                rollupWhere={editRollup.where ?? []}
                onRollupWhere={(value) =>
                  patchEditRollup({ where: value,
                                    whereConj: editRollup.whereConj ?? "and" })
                }
                rollupWhereConj={editRollup.whereConj ?? "and"}
                onRollupWhereConj={(value) => patchEditRollup({ whereConj: value })}
                rollupConditions={editRollup.conditions ?? []}
                onRollupConditions={(value) =>
                  patchEditRollup({ conditions: value,
                                    conditionConj: editRollup.conditionConj ?? "and" })
                }
                rollupConditionConj={editRollup.conditionConj ?? "and"}
                onRollupConditionConj={(value) => patchEditRollup({ conditionConj: value })}
              />
            </div>
          ) : onRetype && field.type === "automation" ? (
            <div className="cg-type-block">
              <span className="cg-type-title">Automation</span>
              <ExtraTypeEditor
                kind="automation"
                fields={fields}
                formulaText={editFormulaText}
                onFormulaText={setEditFormulaText}
                formulaError={null}
                maxValue={retypeMaxValue}
                onMaxValue={setRetypeMaxValue}
                codeLanguage={editCodeLanguage}
                onCodeLanguage={setEditCodeLanguage}
                idPrefix="cg-edit"
                automationKind={editAutomationKind}
                onAutomationKind={setEditAutomationKind}
                automationUrlField={editAutomationUrlField}
                onAutomationUrlField={setEditAutomationUrlField}
              />
            </div>
          ) : onRetype ? (
            <>
              <div className="cg-type-block">
                <span className="cg-type-title">Field type</span>
                {/* The same find-box-over-icon-listbox the create pane wears (owner item 8 of
                    the PREVIOUS wave) — one control for "pick a type" everywhere. */}
                <TypePicker
                  value={editType}
                  onPick={(k) => setEditType(k as FieldType)}
                  offerMeasure={false}
                  only={RETYPE_TYPES}
                />
              </div>
              {/*
                ⭐⭐ 2026-08-07 (D-79's last half) — MARK THIS COLUMN AS AN INSTAGRAM PROFILE.
                Wave 25 shipped this flag's READER everywhere (the type line above, the cell
                validator, R6's clear-on-write, the one-per-table refusal) and never its WRITER,
                so `enrich_instagram` could not be bound to any database somebody made
                themselves — the owner's *"on a schedule, enrich these sets of influencer
                names"*. One checkbox; the server door already existed.

                ⛔ `text` ONLY, and it mirrors `_clean_field` rather than restating a rule: a
                flag on a select or an int would promise a validated handle to a cell nothing
                validates, and the server REFUSES it. Offering it there would be a control whose
                only outcome is a 400.
                ⚠ The one-per-table rule is NOT re-implemented here. The server refuses a second
                one with a sentence naming the column that already has it, and `patchTableField`
                surfaces that sentence verbatim — a client copy of the rule is how two doors
                start disagreeing about which column is the profile.
              */}
              {onProfileFlag && editType === "text" && (
                <label className="cg-check-row">
                  <input
                    type="checkbox"
                    checked={isProfileField(field)}
                    onChange={(event) => onProfileFlag(field.key, event.target.checked)}
                  />
                  <span>Instagram profile column</span>
                </label>
              )}
              {onProfileFlag && editType === "text" && (
                <div className="cg-field-hint">
                  {isProfileField(field)
                    ? "Automations enrich from this column. Clearing a cell also clears that "
                      + "row's enriched columns."
                    : "Lets an Enrich step know which column holds the handle. A database has "
                      + "at most one."}
                </div>
              )}
              {editType === "code" && (
                <label>
                  <span>Language</span>
                  <select
                    className="cg-select"
                    value={editCodeLanguage}
                    aria-label="Code language"
                    onChange={(event) => setEditCodeLanguage(event.target.value)}
                  >
                    {/* Explicit `value` on every option: a <select> whose value names nothing
                        renders its FIRST option and reports a choice nobody made. */}
                    {CODE_LANGUAGES.map((lang) => (
                      <option key={lang} value={lang}>
                        {CODE_LANGUAGE_LABELS[lang]}
                      </option>
                    ))}
                  </select>
                  <span className="cg-field-hint">
                    Chooses how the snippet is coloured. It is never run.
                  </span>
                </label>
              )}
              {editType === "rating" && (
                <label>
                  <span>Number of stars</span>
                  <input
                    className="cg-input cg-rating-max"
                    type="number"
                    min={2}
                    max={10}
                    value={retypeMaxValue}
                    aria-label="Number of stars"
                    onChange={(event) => {
                      const n = Math.round(Number(event.target.value));
                      setRetypeMaxValue(
                        Number.isFinite(n) ? Math.max(2, Math.min(10, n)) : 5
                      );
                    }}
                  />
                </label>
              )}
              {needsOptions(editType) && (
                <OptionsEditor
                  idPrefix="cg-edit-option"
                  drafts={editOptionDrafts}
                  onDrafts={setEditOptionDrafts}
                  colorCode={editColorCode}
                  onColorCode={setEditColorCode}
                  type={editType}
                />
              )}
              {editType !== field.type && (
                <div className="cg-field-hint">
                  Changes {field.label} into a {TYPE_LABELS[editType].toLowerCase()} field,
                  keeping its name and its values as entered. Cells that cannot be read in
                  the new type show blank.
                </div>
              )}
            </>
          ) : null}
          {/* Item 21 (owner, 2026-08-02) — the PERIOD lives here, with the field's other
              properties, instead of floating above the action list on the menu pane. A metric
              column IS "a number over a period": the window is as much a part of its
              definition as its name is, and it was the one property you edited from a
              different window than every other one.
              It shares this pane's ONE Save (`applyEdit` applies it alongside a rename) —
              the old "Apply period" button became a second primary action in a pane that
              already had one, which is the ambiguity the move was supposed to remove. */}
          {canPeriod && (
            <label className="cg-edit-period">
              <span>Period</span>
              <span className="cg-measure-window">
                <WindowPicker
                  window={periodDraft ?? field.measure!.window}
                  onWindow={setPeriodDraft}
                />
              </span>
              <span className="cg-field-hint">
                The window this number is computed over, for every customer.
              </span>
            </label>
          )}
          {!onRetype && field.type === "formula" && onFormula && (
            <ExtraTypeEditor
              kind="formula"
              fields={fields}
              formulaText={editFormulaText}
              onFormulaText={setEditFormulaText}
              formulaError={editFormulaCheck.ok ? null : editFormulaCheck.error ?? null}
              maxValue={retypeMaxValue}
              onMaxValue={setRetypeMaxValue}
              codeLanguage={editCodeLanguage}
              onCodeLanguage={setEditCodeLanguage}
              idPrefix="cg-edit"
              showFormulaHelp={false}
            />
          )}
          <div className="cg-form-actions">
            <button
              type="button"
              className="cg-btn cg-btn--primary"
              disabled={!canSaveEdit}
              onClick={applyEdit}
            >
              Save
            </button>
            <button
              type="button"
              className="cg-btn"
              // Item 12 — opened STRAIGHT into this pane (the kanban's "Add option")? Back means
              // close, exactly as Cancel does in the directly-opened create form: there is no
              // action list behind a pane nobody navigated to.
              onClick={() => (initialPane ? onClose() : setPane("menu"))}
            >
              Back
            </button>
          </div>
          {/* -------- Change field (owner item 9, folded in here by owner item 8) -------- */}
          {!locked && swapOptions.length > 0 && (
            <div className="cg-edit-swap">
              <span className="cg-type-title">Change field</span>
              <div className="cg-field-hint">
                Show a different field in this column — the current one is hidden, not lost.
              </div>
              <div className="cg-column-swap">
                {/* Item 20 — the ONE picker on this surface that keeps its groups, and it is
                    not a contradiction of the filter list's flatness: those three headings
                    separate DIFFERENT KINDS OF ACT (show a pre-set column · show one of yours ·
                    make a new one), not three flavours of the same noun. The type mark does
                    the work the "New field" labels were doing on their own. */}
                <FieldSelectButton
                  className="cg-swap-select"
                  ariaLabel="Change this column to another field"
                  placeholder="Choose a field…"
                  // Focus falls here when the pane has no editable Name (a read-only source
                  // field): the swap picker is then the pane's first live control.
                  overlayAutofocus={!onRename}
                  value={swapTo || undefined}
                  onChange={setSwapTo}
                  fields={[
                    ...presetSwap.map((f) => ({
                      key: f.key, label: f.label, type: f.type, group: "Pre-set fields",
                    })),
                    ...yourSwap.map((f) => ({
                      key: f.key, label: f.label, type: f.type, group: "Your fields",
                    })),
                    ...FIELD_TYPES.map((t) => ({
                      key: NEW_PREFIX + t.value,
                      label: t.label,
                      type: t.value,
                      group: "New field",
                    })),
                  ]}
                />
                {!swapToNewType && (
                  <button
                    type="button"
                    className="cg-btn cg-btn--primary"
                    disabled={!swapTo}
                    onClick={() => {
                      onChangeField(swapTo);
                      onClose();
                    }}
                  >
                    Change
                  </button>
                )}
              </div>
              {/* The "New field" half: name it (and give it choices/its formula/its stars
                  when the type needs them), then create-and-swap in one motion. */}
              {swapToNewType && (
                <div className="cg-column-create cg-swap-create">
                  <label>
                    <span>New {TYPE_LABELS[swapToNewType].toLowerCase()} field</span>
                    <input
                      className="cg-input"
                      autoFocus
                      value={swapLabel}
                      placeholder="Field name"
                      onChange={(event) => setSwapLabel(event.target.value)}
                      onKeyDown={(event) => event.key === "Enter" && createAndSwap()}
                    />
                  </label>
                  <ExtraTypeEditor
                    kind={swapToNewType}
                    fields={fields}
                    formulaText={swapFormulaText}
                    onFormulaText={setSwapFormulaText}
                    formulaError={
                      swapFormulaCheck.ok ? null : swapFormulaCheck.error ?? null
                    }
                    maxValue={swapMaxValue}
                    onMaxValue={setSwapMaxValue}
                    codeLanguage={swapCodeLanguage}
                    onCodeLanguage={setSwapCodeLanguage}
                    idPrefix="cg-swap"
                  />
                  {needsOptions(swapToNewType) && (
                    <OptionsEditor
                      idPrefix="cg-swap-option"
                      drafts={swapOptionDrafts}
                      onDrafts={setSwapOptionDrafts}
                      colorCode={swapColorCode}
                      onColorCode={setSwapColorCode}
                      type={swapToNewType}
                    />
                  )}
                  {swapToNewType === "user" && (
                    <div className="cg-field-hint">
                      {userOptions.length
                        ? `${userOptions.length} people can be assigned.`
                        : "No user list was supplied by the host yet."}
                    </div>
                  )}
                  {scopeChoice && (
                    <ScopeControl value={scopeDraft} onValue={setScopeDraft} />
                  )}
                  <div className="cg-form-actions">
                    <button
                      type="button"
                      className="cg-btn cg-btn--primary"
                      disabled={!canCreateSwap}
                      onClick={createAndSwap}
                    >
                      Create and change
                    </button>
                    <button
                      type="button"
                      className="cg-btn"
                      onClick={() => setSwapTo("")}
                    >
                      Cancel
                    </button>
                  </div>
                </div>
              )}
            </div>
          )}
        </div>
      </AnchoredOverlay>
    );
  }

  // ------------------------------------------------------------------ NOTE pane (item 2)
  // "Edit field description" edits the USER's note — the canonical `description` is the
  // contract's default and is shown as context, never written from here.
  if (pane === "note") {
    return (
      <AnchoredOverlay
        anchor={state.anchor}
        className="cg-column-menu"
        onDismiss={onClose}
        role="dialog"
        ariaLabel={`Edit description for ${field.label}`}
        initialFocus="[data-overlay-autofocus]"
        dataKind="column-menu"
      >
        <PaneHead title="Edit field description" sub={field.label} onClose={onClose} />
        <div className="cg-column-create">
          {field.description && (
            <div className="cg-field-hint cg-desc-default">
              Default description: {field.description}
            </div>
          )}
          <label>
            <span>Your description</span>
            <textarea
              className="cg-input"
              data-overlay-autofocus
              autoFocus
              rows={4}
              value={note}
              placeholder={
                field.description
                  ? "Write your own to replace the default…"
                  : "Explain how this field should be used…"
              }
              onChange={(event) => setNote(event.target.value)}
            />
          </label>
          <div className="cg-form-actions">
            <button
              type="button"
              className="cg-btn cg-btn--primary"
              disabled={note === (field.note ?? "")}
              onClick={() => {
                onNote(note);
                onClose();
              }}
            >
              Save
            </button>
            <button type="button" className="cg-btn" onClick={() => setPane("menu")}>
              Back
            </button>
          </div>
        </div>
      </AnchoredOverlay>
    );
  }

  // ------------------------------------------------------------- PERMISSIONS pane (item 1)
  if (pane === "permissions") {
    return (
      <AnchoredOverlay
        anchor={state.anchor}
        className="cg-column-menu"
        onDismiss={onClose}
        role="dialog"
        ariaLabel={`Edit permissions for ${field.label}`}
        initialFocus="[data-overlay-autofocus]"
        dataKind="column-menu"
      >
        <PaneHead title="Edit field permissions" sub={field.label} onClose={onClose} />
        <div className="cg-column-create">
          <div className="cg-field-hint">
            Who can edit this field's values{field.createdBy ? ` (created by ${field.createdBy})` : ""}.
          </div>
          {(
            [
              ["everyone", "Everyone"],
              ["creator", "Only the creator"],
              ["admins", "Only admins"],
            ] as const
          ).map(([value, text]) => (
            <label key={value} className="cg-radio-row">
              <input
                type="radio"
                name="cg-perm"
                data-overlay-autofocus={value === "everyone" ? true : undefined}
                checked={permDraft === value}
                onChange={() => setPermDraft(value)}
              />
              <span>{text}</span>
            </label>
          ))}
          <div className="cg-form-actions">
            <button
              type="button"
              className="cg-btn cg-btn--primary"
              disabled={permDraft === (field.permissions?.edit ?? "everyone")}
              onClick={() => {
                onPermissions?.(permDraft);
                onClose();
              }}
            >
              Save
            </button>
            <button type="button" className="cg-btn" onClick={() => setPane("menu")}>
              Back
            </button>
          </div>
        </div>
      </AnchoredOverlay>
    );
  }

  // ------------------------------------------------------------------ FORMAT pane (item 10)
  /**
   * ⭐⭐ WAVE-29 T33 (owner item 17) — THE COLUMN SUMMARY PANE.
   *
   * A flat list of the six aggregates plus "None", because that is the whole decision — there is
   * no draft to reconcile and no Save button to press, so the click IS the answer and the pane
   * closes on it (the same shape as Sort, one group up, and unlike Format, which composes four
   * settings into one bag).
   *
   * ⛔ THE OPTIONS COME FROM `aggOptions`, never from a list written here. `sum · average ·
   * median · min · max` are numeric-only and `count` counts ROWS, so a text column offers exactly
   * one row — and it offers it, rather than hiding the pane, because "how many records is this
   * group" is the summary a text column CAN answer.
   */
  if (pane === "summary" && onAggregate) {
    const options = aggOptions(field);
    return (
      <AnchoredOverlay
        anchor={state.anchor}
        className="cg-column-menu"
        onDismiss={onClose}
        role="dialog"
        ariaLabel={`Summarize ${field.label}`}
        initialFocus="[data-overlay-autofocus]"
        dataKind="column-menu"
      >
        <PaneHead title="Summarize" sub={field.label} onClose={onClose} />
        <div className="cg-menu-list" role="none">
          <button
            type="button"
            data-overlay-autofocus={field.agg ? undefined : true}
            aria-pressed={!field.agg}
            onClick={() => {
              onAggregate(undefined);
              onClose();
            }}
          >
            <MenuLabel icon="off" text="None" />
          </button>
          {options.map((name) => (
            <button
              key={name}
              type="button"
              data-overlay-autofocus={field.agg === name ? true : undefined}
              aria-pressed={field.agg === name}
              onClick={() => {
                onAggregate(name);
                onClose();
              }}
            >
              <MenuLabel icon="format" text={AGG_LABELS[name]} />
            </button>
          ))}
        </div>
      </AnchoredOverlay>
    );
  }

  if (pane === "format" && formatKind) {
    return (
      <AnchoredOverlay
        anchor={state.anchor}
        className="cg-column-menu"
        onDismiss={onClose}
        role="dialog"
        ariaLabel={`Format ${field.label}`}
        initialFocus="[data-overlay-autofocus]"
        dataKind="column-menu"
      >
        <PaneHead title="Field format" sub={field.label} onClose={onClose} />
        <div className="cg-column-create">
          {formatKind === "number" ? (
            <>
              <label className="cg-radio-row">
                <input
                  type="checkbox"
                  data-overlay-autofocus
                  checked={fmtDraft.thousands !== false}
                  onChange={(e) =>
                    setFmtDraft((d) => ({ ...d, thousands: e.target.checked }))
                  }
                />
                <span>Thousands separator (12,345)</span>
              </label>
              <label>
                <span>Decimal places</span>
                <select
                  className="cg-select"
                  value={
                    Number.isInteger(fmtDraft.decimals) ? String(fmtDraft.decimals) : ""
                  }
                  aria-label="Decimal places"
                  onChange={(e) =>
                    setFmtDraft((d) => {
                      const next = { ...d };
                      if (e.target.value === "") delete next.decimals;
                      else next.decimals = Number(e.target.value);
                      return next;
                    })
                  }
                >
                  <option value="">As entered</option>
                  {[0, 1, 2, 3, 4].map((n) => (
                    <option key={n} value={n}>
                      {n}
                    </option>
                  ))}
                </select>
              </label>
              <label className="cg-radio-row">
                <input
                  type="checkbox"
                  checked={fmtDraft.abbrev === true}
                  onChange={(e) =>
                    setFmtDraft((d) => ({ ...d, abbrev: e.target.checked }))
                  }
                />
                <span>Abbreviate large numbers (34.0M)</span>
              </label>
            </>
          ) : (
            <>
              <label className="cg-radio-row">
                <input
                  type="checkbox"
                  data-overlay-autofocus
                  checked={fmtDraft.time ?? field.type === "created_time"}
                  onChange={(e) => setFmtDraft((d) => ({ ...d, time: e.target.checked }))}
                />
                <span>Include the time of day</span>
              </label>
              <label>
                <span>Time zone</span>
                <select
                  className="cg-select"
                  value={fmtDraft.tz === "utc" ? "utc" : "local"}
                  aria-label="Time zone"
                  onChange={(e) =>
                    setFmtDraft((d) => ({ ...d, tz: e.target.value as "local" | "utc" }))
                  }
                >
                  <option value="local">Your local time</option>
                  <option value="utc">UTC</option>
                </select>
              </label>
            </>
          )}
          <div className="cg-form-actions">
            <button
              type="button"
              className="cg-btn cg-btn--primary"
              disabled={JSON.stringify(fmtDraft) === JSON.stringify(field.format ?? {})}
              onClick={() => {
                onFormat?.(fmtDraft);
                onClose();
              }}
            >
              Save
            </button>
            <button type="button" className="cg-btn" onClick={() => setPane("menu")}>
              Back
            </button>
          </div>
        </div>
      </AnchoredOverlay>
    );
  }

  // ------------------------------------------------------------------ the MENU pane
  // Wave-5 items 1/2/3: a flat action list. Editors open their OWN windows (the panes above);
  // nothing edits inline here. Conditional entries render IFF they apply to the current view.
  const canPermissions =
    !!onPermissions &&
    !!viewer &&
    (viewer.isAdmin || (field.createdBy != null && field.createdBy === viewer.name));

  return (
    <AnchoredOverlay
      anchor={state.anchor}
      className="cg-column-menu"
      onDismiss={onClose}
      role="dialog"
      ariaLabel={`Column settings for ${field.label}`}
      initialFocus="[data-overlay-autofocus]"
      dataKind="column-menu"
    >
      <PaneHead title={field.label} sub={typeLine} onClose={onClose} />

      {/* Item 8c — any measure-carrying column exposes its PERIOD, the property that defines
          it. Item 21 (2026-08-02) moved the EDITOR into the Edit-field pane; what stays here
          is one line that STATES the period and opens that pane, because the window is the
          first thing you want to know about a metric column and the menu had become the only
          place it was written down. A row, not a control: the menu pane edits nothing inline. */}
      {canPeriod && !schemaLocked && (
        <button
          type="button"
          className="cg-column-periodline"
          onClick={() => {
            setRenameDraft(field.label);
            setPane("edit");
          }}
        >
          <span className="cg-swap-label">Period</span>
          <span className="cg-column-periodval">{windowLabel(field.measure!.window)}</span>
        </button>
      )}

      {/* Wave-7 item W4 (contract C6): Airtable's grouping, thin dividers between groups,
          an icon on EVERY action. Presentation only — every handler and event is the one it
          was before; entries not in Airtable's list slot into the nearest sensible group. */}
      <div className="cg-column-actions">
        {/* Owner item 8 (2026-07-31) — EDIT FIELD sits at the very top, above Duplicate:
            the one window for the field's name, type (with per-type choices/stars/formula)
            and the Change-field control. Offered on EVERY field — what a read-only field
            cannot change, the pane says honestly instead of hiding the door. */}
        {!schemaLocked && (
          <button type="button" data-overlay-autofocus onClick={() => {
            setRenameDraft(field.label);
            setPane("edit");
          }}>
            <MenuLabel icon="rename" text="Edit field" />
          </button>
        )}

        <div className="cg-menu-sep" role="separator" aria-hidden />

        {/* Group 1 — Duplicate · Insert left · Insert right (+ Add at end, same family). */}
        {!schemaLocked && onDuplicate && (
          <button type="button" onClick={() => { onDuplicate(); onClose(); }}>
            <MenuLabel icon="duplicate" text="Duplicate field" />
          </button>
        )}
        <button type="button" onClick={() => setPosition("left")}>
          <MenuLabel icon="insertLeft" text="Insert field left" />
        </button>
        <button type="button" onClick={() => setPosition("right")}>
          <MenuLabel icon="insertRight" text="Insert field right" />
        </button>
        <button type="button" onClick={() => setPosition("end")}>
          <MenuLabel icon="addEnd" text="Add field at end" />
        </button>

        <div className="cg-menu-sep" role="separator" aria-hidden />

        {/* Group 2 — the rest of the def-editing family: description · permissions · format.
            Rename and Change field live INSIDE Edit field now (owner item 8) — their old
            rows are gone, not duplicated. */}
        {!schemaLocked && (
          <button type="button" onClick={() => setPane("note")}>
            <MenuLabel icon="description" text="Edit field description" />
          </button>
        )}
        {!schemaLocked && canPermissions && (
          <button type="button" onClick={() => setPane("permissions")}>
            <MenuLabel icon="permissions" text="Edit field permissions" />
          </button>
        )}
        {!schemaLocked && formatKind && (
          <button type="button" onClick={() => setPane("format")}>
            <MenuLabel icon="format" text="Field format" />
          </button>
        )}
        {/* ⭐ WAVE-29 T33 (owner item 17) — the COLUMN SUMMARY. Offered on every column, because
            `count` applies to any type; the numeric folds are filtered per type inside the pane
            by `aggOptions`. ⚠ NOT gated on `schemaLocked`: a summary is a reading of the column,
            not a change to its schema, so it belongs on a pre-set column too — the same reason
            Sort and Filter sit below without that gate. */}
        {onAggregate && (
          <button type="button" onClick={() => setPane("summary")}>
            <MenuLabel
              icon="format"
              text={field.agg ? `Summary: ${AGG_LABELS[field.agg]}` : "Summarize this column"}
            />
          </button>
        )}

        <div className="cg-menu-sep" role="separator" aria-hidden />

        {/* Group 3 — sort. Direction wording stays the shipped per-type directionLabel. */}
        <button type="button" onClick={() => { onSort("asc"); onClose(); }}>
          <MenuLabel
            icon="sortAsc"
            text={`Sort ${directionLabel(field.type, "asc")}`}
          />
        </button>
        <button type="button" onClick={() => { onSort("desc"); onClose(); }}>
          <MenuLabel
            icon="sortDesc"
            text={`Sort ${directionLabel(field.type, "desc")}`}
          />
        </button>
        {sortedDir != null && (
          <button type="button" onClick={() => { onClearSort(); onClose(); }}>
            <MenuLabel icon="off" text="Don't sort by this field" />
          </button>
        )}

        <div className="cg-menu-sep" role="separator" aria-hidden />
        {/* Group 4 — the view-config group: filter · group (+ pin, which also shapes
            the view). */}
        {/* Item 6c: a measure-carrying column's Filter-by seeds the equivalent MEASURE
            condition — the designed replacement for filtering the (filterable:false)
            column itself (offered only while the host serves measures, the same
            availability rule as measure conditions). Everything else keeps the plain
            filterable check. */}
        {(field.filterable !== false ||
          (field.measure != null && measures.length > 0)) && (
          <button type="button" onClick={() => { onFilterBy(); onClose(); }}>
            <MenuLabel icon="filter" text="Filter by this field" />
          </button>
        )}
        {isFiltered && (
          <button type="button" onClick={() => { onClearFilter(); onClose(); }}>
            <MenuLabel icon="off" text="Don't filter by this field" />
          </button>
        )}
        {groupable && !isGrouped && (
          <button type="button" onClick={() => { onGroupByField(); onClose(); }}>
            <MenuLabel icon="group" text="Group by this field" />
          </button>
        )}
        {isGrouped && (
          <button type="button" onClick={() => { onClearGroup(); onClose(); }}>
            <MenuLabel icon="off" text="Don't group by this field" />
          </button>
        )}
        {/* Item 11c — pin: freeze the columns up to this one; Unpin restores the identity
            column alone. */}
        {onPinTo && !pinnedTo && (
          <button type="button" onClick={() => { onPinTo(); onClose(); }}>
            <MenuLabel icon="pin" text="Pin up to this field" />
          </button>
        )}
        {onUnpin && (
          <button type="button" onClick={() => { onUnpin(); onClose(); }}>
            <MenuLabel icon="unpin" text="Unpin all fields" />
          </button>
        )}

        <div className="cg-menu-sep" role="separator" aria-hidden />

        {/* Group 5 — hide · delete. */}
        <button
          type="button"
          disabled={locked}
          title={locked ? "The primary field stays visible" : undefined}
          onClick={onHide}
        >
          <MenuLabel icon="hide" text="Hide field" />
        </button>
        {!schemaLocked && onDelete && (
          <button
            type="button"
            className="is-danger"
            title={
              /**
               * ⭐ 2026-08-10 — THE PRE-SET ROLLUP COMES BACK, and the honest place to say so is
               * here rather than in a tombstone.
               *
               * A pre-set column carries `automation.preset`, and BOTH reconcilers
               * (`_reconcile_ig_graph_fields`, `odoo_relational`'s forward migration) re-declare
               * every field they own on the next run. RECONFIGURING one sticks — the custody
               * stamp (`userEdited`) switches the reconciler off for that column — but DELETING
               * one leaves nothing behind to carry a stamp, so it is re-added within a tick.
               * ⛔ NOT FIXED WITH A TOMBSTONE, deliberately: that is a new store key two
               * reconcilers must both consult, and the custody stamp is the precedent for how
               * that goes wrong when only one of them reads it. The delete is not broken — it is
               * a delete of something the product re-declares, and the user is told which.
               */
              field.measure
                ? "Removes this formula column from the workspace."
                : field.automation?.preset === true
                ? "Part of this database's built-in schema — it will be re-created on the " +
                  "next run. Hide it to keep it off the grid."
                : field.type === "rollup" || field.type === "link" ||
                  field.type === "formula"
                ? "Removes this column. No values are lost — it holds none of its own."
                : "Removes this field AND its values on every row."
            }
            onClick={() => (confirmDelete ? onDelete() : setConfirmDelete(true))}
          >
            <MenuLabel
              icon="trash"
              text={confirmDelete ? "Delete permanently?" : "Delete field"}
            />
          </button>
        )}
      </div>
    </AnchoredOverlay>
  );
}