/**
 * InteractiveEditor — tabbed editor for one interactive experience.
 *
 * UI-2a placeholder — just renders the project header and a tab
 * strip with the six future sub-panels disabled. The real panel
 * bodies land in UI-3 / UI-4 / UI-5:
 *
 *   UI-3: Graph   — DAG visualizer over ix_nodes + ix_edges
 *         Catalog — action_catalog CRUD with level/scheme gates
 *   UI-4: Rules   — personalization-rule DSL builder
 *         QA      — run checks, render issues
 *         Publish — channel picker + publish flow
 *   UI-5: Analytics — experience + session rollups
 *
 * The editor owns the currently-selected tab in local state;
 * switching tabs never unmounts the project header so the
 * breadcrumb + status badge stay stable.
 */

import React, { useMemo, useState } from "react";
import {
  BarChart3, CheckSquare, GitBranch, ListChecks, Play, Send, Sparkles,
} from "lucide-react";
import { createInteractiveApi } from "./interactive/api";
import { AnalyticsPanel } from "./interactive/AnalyticsPanel";
import { CatalogPanel } from "./interactive/CatalogPanel";
import { GraphPanel } from "./interactive/GraphPanel";
import { PublishPanel } from "./interactive/PublishPanel";
import { QAPanel } from "./interactive/QAPanel";
import { RulesPanel } from "./interactive/RulesPanel";
import type { Experience } from "./interactive/types";
import {
  ErrorBanner, StatusBadge, useAsyncResource,
} from "./interactive/ui";

export interface InteractiveEditorProps {
  backendUrl: string;
  apiKey?: string;
  projectId: string;
  /**
   * Optional callback to launch the player for this experience.
   * Shown as a prominent "Play" button in the editor header when
   * provided. Host decides routing (App.tsx wires it to the same
   * ``interactivePlayId`` state the landing grid Play CTA uses).
   */
  onPlay?: () => void;
}

type TabKey = "graph" | "catalog" | "rules" | "qa" | "publish" | "analytics";

const TABS: Array<{ key: TabKey; label: string; icon: React.ReactNode; description: string }> = [
  { key: "graph",     label: "Graph",     icon: <GitBranch className="w-4 h-4" aria-hidden />,    description: "Scenes, branches, and transitions" },
  { key: "catalog",   label: "Catalog",   icon: <ListChecks className="w-4 h-4" aria-hidden />,   description: "Actions viewers can take" },
  { key: "rules",     label: "Rules",     icon: <Sparkles className="w-4 h-4" aria-hidden />,     description: "Personalization routing" },
  { key: "qa",        label: "QA",        icon: <CheckSquare className="w-4 h-4" aria-hidden />,  description: "Readiness checks" },
  { key: "publish",   label: "Publish",   icon: <Send className="w-4 h-4" aria-hidden />,         description: "Channels + versions" },
  { key: "analytics", label: "Analytics", icon: <BarChart3 className="w-4 h-4" aria-hidden />,    description: "Viewer engagement" },
];

export function InteractiveEditor({
  backendUrl, apiKey, projectId, onPlay,
}: InteractiveEditorProps) {
  const api = useMemo(() => createInteractiveApi(backendUrl, apiKey), [backendUrl, apiKey]);
  const [activeTab, setActiveTab] = useState<TabKey>("graph");

  const exp = useAsyncResource<Experience>(
    (signal) => api.getExperience(projectId, signal),
    [api, projectId],
  );

  // Same shell pattern as the wizard: project header + tab strip
  // are pinned; only the active panel scrolls. Keeps the tab row
  // visible at all times even when a panel (analytics cards,
  // catalog table) is tall.
  return (
    <div className="flex flex-col h-full w-full">
      <header className="shrink-0 border-b border-[#2a2a2a]">
        <div className="max-w-6xl mx-auto px-6 pt-6 pb-3">
          {exp.error ? (
            <ErrorBanner
              title="Couldn't load this project"
              message={exp.error}
              onRetry={exp.reload}
            />
          ) : exp.loading || !exp.data ? (
            <ProjectHeaderSkeleton />
          ) : (
            <ProjectHeader experience={exp.data} onPlay={onPlay} />
          )}
          <div className="mt-4">
            <TabStrip active={activeTab} onChange={setActiveTab} />
          </div>
        </div>
      </header>

      <div className="flex-1 min-h-0 overflow-y-auto">
        <div className="max-w-6xl mx-auto px-6 py-6">
        {activeTab === "graph" && <GraphPanel api={api} projectId={projectId} />}
        {activeTab === "catalog" && <CatalogPanel api={api} projectId={projectId} />}
        {activeTab === "rules" && <RulesPanel api={api} projectId={projectId} />}
        {activeTab === "qa" && <QAPanel api={api} projectId={projectId} />}
        {activeTab === "publish" && <PublishPanel api={api} projectId={projectId} />}
        {activeTab === "analytics" && <AnalyticsPanel api={api} projectId={projectId} />}
        </div>
      </div>
    </div>
  );
}

// ────────────────────────────────────────────────────────────────
// Project header (title, status, description)
// ────────────────────────────────────────────────────────────────

function ProjectHeader({
  experience, onPlay,
}: {
  experience: Experience;
  onPlay?: () => void;
}) {
  return (
    <header className="flex items-start justify-between gap-4 flex-wrap">
      <div className="min-w-0">
        <div className="flex items-center gap-3 flex-wrap">
          <h1 className="text-2xl font-medium truncate">
            {experience.title || "(untitled)"}
          </h1>
          <StatusBadge status={experience.status} />
        </div>
        {(experience.description || experience.objective) && (
          <p className="text-sm text-[#aaa] mt-1 max-w-2xl">
            {experience.description || experience.objective}
          </p>
        )}
        <div className="mt-2 text-xs text-[#777] flex flex-wrap gap-3">
          <span>mode: <span className="text-[#cfd8dc]">{experience.experience_mode}</span></span>
          <span>profile: <span className="text-[#cfd8dc]">{experience.policy_profile_id}</span></span>
          {typeof experience.branch_count === "number" && (
            <span>{experience.branch_count} {experience.branch_count === 1 ? "branch" : "branches"}</span>
          )}
          {typeof experience.max_depth === "number" && (
            <span>depth {experience.max_depth}</span>
          )}
        </div>
      </div>
      {onPlay && (
        <button
          type="button"
          onClick={onPlay}
          aria-label="Play this experience"
          className={[
            "inline-flex items-center gap-2 shrink-0",
            "rounded-full px-4 py-2 text-sm font-semibold",
            "bg-gradient-to-r from-[#ec4899] to-[#8b5cf6] text-white",
            "hover:brightness-110 active:scale-[0.98] transition-all",
            "shadow-lg shadow-[#8b5cf6]/20",
            "focus:outline-none focus-visible:ring-2 focus-visible:ring-[#8b5cf6] focus-visible:ring-offset-2 focus-visible:ring-offset-[#0f0f0f]",
          ].join(" ")}
        >
          <Play className="w-4 h-4 fill-current" aria-hidden />
          Play
        </button>
      )}
    </header>
  );
}

function ProjectHeaderSkeleton() {
  return (
    <div className="flex flex-col gap-2 animate-pulse" aria-busy="true">
      <div className="h-7 bg-[#1f1f1f] rounded w-2/3 max-w-md" />
      <div className="h-4 bg-[#1f1f1f] rounded w-full max-w-2xl" />
      <div className="h-3 bg-[#1f1f1f] rounded w-1/3 max-w-xs mt-1" />
    </div>
  );
}

// ────────────────────────────────────────────────────────────────
// Tab strip
// ────────────────────────────────────────────────────────────────

function TabStrip({
  active, onChange,
}: {
  active: TabKey;
  onChange: (key: TabKey) => void;
}) {
  return (
    <nav
      aria-label="Editor sections"
      className="flex gap-1 border-b border-[#3f3f3f] overflow-x-auto -mx-2 px-2"
    >
      {TABS.map((tab) => {
        const selected = active === tab.key;
        return (
          <button
            key={tab.key}
            type="button"
            role="tab"
            aria-selected={selected}
            onClick={() => onChange(tab.key)}
            className={[
              "inline-flex items-center gap-2 px-3 py-2 text-sm font-medium whitespace-nowrap",
              "border-b-2 -mb-px transition-colors",
              "focus:outline-none focus-visible:ring-2 focus-visible:ring-[#3ea6ff]",
              selected
                ? "border-[#3ea6ff] text-[#3ea6ff]"
                : "border-transparent text-[#aaa] hover:text-[#f1f1f1] hover:border-[#555]",
            ].join(" ")}
          >
            {tab.icon}
            {tab.label}
          </button>
        );
      })}
    </nav>
  );
}