"""Map ChatPlan JSON ↔ DayPlanPut / BlockFeedback for external AI chat loop."""

from __future__ import annotations

from typing import Any, Literal
from uuid import uuid4

from app.schedule_math import minutes_between, overlaps, validate_blocks
from app.schedule_store import (
    BlockFeedback,
    DayPlan,
    DayPlanPut,
    DayReview,
    ScheduledBlock,
)

KIND_SET = {
    "earn_ship",
    "admin_spain",
    "body_care",
    "move_out",
    "boundary",
    "food_out",
    "stabilize",
    "explore",
    "restore_fun",
    "sleep_window",
    "other",
}
INTENT_SET = {"duty", "explore", "restore_fun", "measure"}
PRIORITY_SET = {"P0", "P1", "P2"}
STATUS_SET = {"planned", "done", "partial", "skipped", "moved", "cancelled"}
DID_SET = {"done", "partial", "skipped"}


class ChatPlanError(Exception):
    """Validation failure with structured messages."""

    def __init__(self, errors: list[str]) -> None:
        self.errors = errors
        Exception.__init__(self, "; ".join(errors))


def _as_list(value: Any) -> list[str]:
    if value is None:
        return []
    if isinstance(value, list):
        return [str(x).strip() for x in value if str(x).strip()]
    text = str(value).strip()
    return [text] if text else []


def _coerce_kind(raw: Any, notes: str) -> tuple[str, str]:
    kind = str(raw or "other").strip() or "other"
    if kind in KIND_SET:
        return kind, notes
    prefix = f"[kind:{kind}]"
    merged = f"{prefix} {notes}".strip() if notes else prefix
    return "other", merged


def _status_from_review(status: str, review: dict[str, Any] | None) -> str:
    if not review:
        return status if status in STATUS_SET else "planned"
    did = review.get("did")
    if did in DID_SET and status in ("planned", "", None):
        return str(did)
    return status if status in STATUS_SET else "planned"


def is_legacy_day_plan_put(payload: dict[str, Any]) -> bool:
    """True when body looks like DayPlanPut (agent format), not ChatPlan."""

    blocks = payload.get("blocks")
    if not isinstance(blocks, list) or not blocks:
        return False
    first = blocks[0] if isinstance(blocks[0], dict) else {}
    has_planned = "planned_min" in first
    chatty = (
        "intention" in payload
        or "day_review" in payload
        or "schema_version" in payload
        or any(isinstance(b, dict) and "review" in b for b in blocks)
    )
    return has_planned and not chatty


def unwrap_import_payload(body: dict[str, Any]) -> tuple[dict[str, Any], Literal["replace", "merge"]]:
    mode_raw = str(body.get("mode") or "replace").lower()
    mode: Literal["replace", "merge"] = "merge" if mode_raw == "merge" else "replace"
    if isinstance(body.get("plan"), dict) and "blocks" in body["plan"]:
        return body["plan"], mode
    if "blocks" in body:
        chat = {k: v for k, v in body.items() if k != "mode"}
        return chat, mode
    raise ChatPlanError(["Expected ChatPlan with blocks (or {plan, mode})"])


def chat_plan_to_day_put(
    chat: dict[str, Any],
    day: str,
    *,
    max_blocks: int = 7,
    previous_blocks: list[dict[str, Any]] | None = None,
    mode: Literal["replace", "merge"] = "replace",
) -> tuple[DayPlanPut, list[BlockFeedback], list[str]]:
    """Map ChatPlan → DayPlanPut + optional feedback rows + warnings."""

    errors: list[str] = []
    warnings: list[str] = []

    if chat.get("date") and str(chat["date"]) != day:
        errors.append(f"date mismatch: JSON {chat['date']} vs URL {day}")

    blocks_in = chat.get("blocks")
    if not isinstance(blocks_in, list) or len(blocks_in) == 0:
        errors.append("blocks must be a non-empty array")
        raise ChatPlanError(errors)

    if is_legacy_day_plan_put(chat):
        put = DayPlanPut.model_validate({**chat, "source": chat.get("source") or "cursor"})
        for block in put.blocks:
            block.date = day
        return put, [], warnings

    mapped: list[ScheduledBlock] = []
    feedbacks: list[BlockFeedback] = []

    for raw in blocks_in:
        if not isinstance(raw, dict):
            errors.append("each block must be an object")
            continue
        start = str(raw.get("start") or "").strip()
        end = str(raw.get("end") or "").strip()
        title = str(raw.get("title") or "").strip() or "Untitled"
        notes = str(raw.get("notes") or "")
        kind, notes = _coerce_kind(raw.get("kind"), notes)
        if str(raw.get("kind") or "") and str(raw.get("kind")) not in KIND_SET:
            warnings.append(f"unknown kind coerced to other: {raw.get('kind')}")
        intent = str(raw.get("intent") or "duty")
        if intent not in INTENT_SET:
            intent = "duty"
        priority = str(raw.get("priority") or "P1")
        if priority not in PRIORITY_SET:
            priority = "P1"
        review = raw.get("review") if isinstance(raw.get("review"), dict) else None
        status = _status_from_review(str(raw.get("status") or "planned"), review)
        try:
            planned = int(raw.get("planned_min") or 0)
            if planned <= 0:
                planned = max(1, minutes_between(start, end))
        except Exception:  # noqa: BLE001
            errors.append(f"invalid times for block {title}")
            continue
        block_id = str(raw.get("id") or "").strip() or str(uuid4())
        locked = bool(raw.get("locked")) if raw.get("locked") is not None else priority == "P0"
        block = ScheduledBlock(
            id=block_id,
            date=day,
            start=start,
            end=end,
            title=title[:200],
            kind=kind,  # type: ignore[arg-type]
            intent=intent,  # type: ignore[arg-type]
            priority=priority,  # type: ignore[arg-type]
            planned_min=planned,
            status=status,  # type: ignore[arg-type]
            source="chat",
            locked=locked,
            notes=notes,
        )
        mapped.append(block)
        if review and review.get("did") in DID_SET:
            minutes = review.get("minutes")
            intensity = review.get("intensity")
            try:
                intensity_i = int(intensity) if intensity is not None else None
            except (TypeError, ValueError):
                intensity_i = None
            try:
                actual = int(minutes) if minutes is not None else None
            except (TypeError, ValueError):
                actual = None
            skip = review.get("skip_reason")
            feedbacks.append(
                BlockFeedback(
                    block_id=block_id,
                    date=day,
                    did=str(review["did"]),  # type: ignore[arg-type]
                    actual_min=actual,
                    quality=review.get("quality"),
                    fun=review.get("fun"),
                    energy_after=review.get("energy_after"),
                    note=str(review.get("comment") or ""),
                    emotions=_as_list(review.get("emotions")),
                    fse_event=str(review.get("fse_event") or ""),
                    intensity=intensity_i,
                    skip_reason=skip if skip in {
                        "time", "fear", "fse", "locks", "boring", "urge", "other"
                    } else None,
                )
            )

    if mode == "merge" and previous_blocks:
        kept = list(previous_blocks)
        for block in mapped:
            conflict = False
            for prev in kept:
                if overlaps(
                    block.start,
                    block.end,
                    str(prev.get("start")),
                    str(prev.get("end")),
                ):
                    errors.append(
                        f"overlap merge conflict: {block.title} vs {prev.get('title')}"
                    )
                    conflict = True
                    break
            if not conflict:
                kept.append(block.model_dump())
        # Rebuild mapped from kept
        mapped = [ScheduledBlock.model_validate({**b, "date": day}) for b in kept]

    val_errors, soft = validate_blocks(
        [b.model_dump() for b in mapped],
        max_blocks=max_blocks,
        previous_p0=None,
        allow_p0_move=True,
        must_include_explore_or_restore=False,
        capacity_hint=None,
    )
    errors.extend(val_errors)
    warnings.extend(soft)
    if errors:
        raise ChatPlanError(errors)

    review_raw = chat.get("day_review") if isinstance(chat.get("day_review"), dict) else {}
    day_review = DayReview(
        comment=str(review_raw.get("comment") or ""),
        emotions=_as_list(review_raw.get("emotions")),
        fse_events=str(review_raw.get("fse_events") or ""),
        what_moved=str(review_raw.get("what_moved") or ""),
        what_avoided=str(review_raw.get("what_avoided") or ""),
        tomorrow_change=str(review_raw.get("tomorrow_change") or ""),
    )
    put = DayPlanPut(
        blocks=mapped,
        source="chat",
        notes=str(chat.get("notes") or ""),
        title=str(chat.get("title") or ""),
        intention=str(chat.get("intention") or ""),
        constraints=_as_list(chat.get("constraints")),
        day_review=day_review,
        force_p0_move=True,
    )
    return put, feedbacks, warnings


def plan_and_feedback_to_chat_plan(
    plan: DayPlan | dict[str, Any],
    feedbacks_by_block_id: dict[str, dict[str, Any]],
) -> dict[str, Any]:
    """Build ChatPlan for export (includes summary)."""

    if isinstance(plan, DayPlan):
        pdata = plan.model_dump(mode="json")
    else:
        pdata = plan

    blocks_out: list[dict[str, Any]] = []
    blocks_done = 0
    blocks_skipped = 0
    p0_done = 0
    p0_total = 0
    planned_sum = 0
    actual_sum = 0

    for block in pdata.get("blocks") or []:
        bid = str(block.get("id") or "")
        fb = feedbacks_by_block_id.get(bid) or block.get("feedback") or {}
        status = str(block.get("status") or "planned")
        did = fb.get("did") if fb.get("did") in DID_SET else (
            status if status in DID_SET else None
        )
        if status == "done" or did == "done":
            blocks_done += 1
        if status == "skipped" or did == "skipped":
            blocks_skipped += 1
        if block.get("priority") == "P0":
            p0_total += 1
            if status == "done" or did == "done":
                p0_done += 1
        planned_sum += int(block.get("planned_min") or 0)
        if fb.get("actual_min") is not None:
            actual_sum += int(fb.get("actual_min") or 0)

        blocks_out.append(
            {
                "id": bid,
                "start": block.get("start"),
                "end": block.get("end"),
                "title": block.get("title"),
                "priority": block.get("priority"),
                "kind": block.get("kind"),
                "intent": block.get("intent"),
                "notes": block.get("notes") or "",
                "locked": bool(block.get("locked")),
                "status": status if status in STATUS_SET else "planned",
                "review": {
                    "did": did,
                    "minutes": fb.get("actual_min"),
                    "quality": fb.get("quality"),
                    "fun": fb.get("fun"),
                    "energy_after": fb.get("energy_after"),
                    "comment": fb.get("note") or "",
                    "emotions": list(fb.get("emotions") or []),
                    "fse_event": fb.get("fse_event") or "",
                    "intensity": fb.get("intensity"),
                    "skip_reason": fb.get("skip_reason"),
                },
            }
        )

    day_review = pdata.get("day_review") or {}
    if hasattr(day_review, "model_dump"):
        day_review = day_review.model_dump()

    return {
        "schema_version": 1,
        "date": pdata.get("date"),
        "title": pdata.get("title") or "",
        "intention": pdata.get("intention") or "",
        "constraints": list(pdata.get("constraints") or []),
        "blocks": blocks_out,
        "day_review": {
            "comment": day_review.get("comment") or "",
            "emotions": list(day_review.get("emotions") or []),
            "fse_events": day_review.get("fse_events") or "",
            "what_moved": day_review.get("what_moved") or "",
            "what_avoided": day_review.get("what_avoided") or "",
            "tomorrow_change": day_review.get("tomorrow_change") or "",
        },
        "summary": {
            "blocks_total": len(blocks_out),
            "blocks_done": blocks_done,
            "blocks_skipped": blocks_skipped,
            "p0_done": p0_done,
            "p0_total": p0_total,
            "planned_min_sum": planned_sum,
            "actual_min_sum": actual_sum,
        },
    }