"use client";

import { X } from "lucide-react";
import { useEffect, useRef } from "react";
import {
  groupWindowTransitions,
  houseTableToNorthIndianChart,
  rectificationBoardPeekCopy,
  workingRectificationTime,
  type RectificationBoardDiff,
} from "@/lib/rectification-board-model";
import { engineMeaningToDisplayCopy } from "@/lib/rectification-agentic/user-copy";
import {
  workingRectificationHouseTable,
  type RectificationCandidateResult,
} from "@/lib/rectification-candidate-result";
import {
  windowScanLayerLabel,
  type WindowScanLayer,
} from "@/lib/rectification-agentic/v9/refinement-packet";
import { rectificationBoardEmptyCopy } from "@/lib/rectification-surface-state";
import { VedicChartSvg } from "@/components/personal-report/vedic-chart-svg";
import { RectificationHouseTableView } from "./rectification-house-table";
import { ConfirmationGateDisclosure, TechniqueAuditDisclosure } from "./technique-audit-disclosure";

function LayerChips({ layers }: Readonly<{ layers: readonly WindowScanLayer[] }>) {
  if (layers.length === 0) return null;
  return (
    <ul className="rectification-board__chips">
      {layers.map((layer) => (
        <li key={layer}>
          <span className="rectification-board__chip">{windowScanLayerLabel(layer)}</span>
        </li>
      ))}
    </ul>
  );
}

function RectificationBoardBody({
  result,
  declaredTime,
  birthTimeSource,
  savedStatus,
  diff,
  compact,
  titleId,
  onClose,
}: Readonly<{
  result: RectificationCandidateResult | null;
  declaredTime: string | null;
  birthTimeSource?: string | null;
  savedStatus: "accepted" | "confirmed" | null;
  diff: RectificationBoardDiff;
  compact: boolean;
  titleId: string;
  onClose: () => void;
}>) {
  const table = result ? workingRectificationHouseTable(result) : null;
  const workingTime = workingRectificationTime(result);
  const emptyCopy = rectificationBoardEmptyCopy(declaredTime, birthTimeSource);
  const grouped = result ? groupWindowTransitions(result.windowTransitions) : [];
  const scoringMinutes = grouped.filter((row) => row.scoringLayers.length > 0);
  const displayMinutes = grouped.filter((row) => row.displayLayers.length > 0);
  const changedHouses = new Set(diff.houseNumbers);
  const changedMinutes = new Set(diff.transitionMinutes);
  const stage = result?.precisionStage?.user_meaning
    ?? result?.natalRecast?.user_meaning
    ?? null;
  const ledger = result?.eventDashaLedger ?? [];
  const contrast = result?.lagnaContrast ?? null;
  const agreement = result?.dashaAgreement ?? null;
  const nakshatra = result?.nakshatraBoundary ?? null;
  // Two sections, not five (D10). Nothing was dropped in the regrouping — the
  // minutes moved under 候选分钟, and the house table, the confirmation gate,
  // the technique audit, the two-lagna split, the event/dasha ledger with its
  // dual-track agreement line and the nakshatra note all moved under 参数与口径.
  // Each block keeps the render condition it had, so a state that showed
  // nothing before still shows nothing: the gate and the audit stay behind
  // `table`, exactly as when they sat inside `.rectification-snapshot`.
  const hasMinuteDetail = scoringMinutes.length > 0 || displayMinutes.length > 0;
  const hasParameterDetail = Boolean(
    table
    || contrast
    || ledger.length > 0
    || (nakshatra?.near_boundary && nakshatra.user_meaning),
  );

  return (
    <>
      {compact ? <div className="rectification-board__handle" aria-hidden="true" /> : null}
      <header className="rectification-board__header">
        <div className="rectification-board__title-row">
          <h2 id={titleId}>当前盘面</h2>
          {workingTime
            ? <span className="rectification-board__clock">{workingTime}</span>
            : emptyCopy.clock
              ? <span className="rectification-board__clock is-declared">{emptyCopy.clock}</span>
              : null}
          {compact && (
            <button
              className="rectification-board__close"
              type="button"
              aria-label="关闭盘面"
              onClick={onClose}
            >
              <X aria-hidden="true" strokeWidth={2} />
            </button>
          )}
        </div>
        {stage ? <p className="rectification-board__stage">{engineMeaningToDisplayCopy(stage)}</p> : null}
      </header>
      <div className="rectification-board__body">
        <p className="sr-only" role="status" aria-live="polite" aria-atomic="true">{diff.liveMessage}</p>
        {!table && (
          <div className="rectification-board__empty">
            {emptyCopy.lines.map((line) => <p key={line}>{line}</p>)}
          </div>
        )}
        {table && (
          <div className="rectification-snapshot">
            <figure className="rectification-board__chart">
              <VedicChartSvg
                chart={houseTableToNorthIndianChart(table)}
                ariaLabel={`当前本命盘，上升${table.lagna}`}
                highlightHouseNumbers={new Set([
                  ...changedHouses,
                  ...(diff.lagnaChanged ? [1] : []),
                ])}
              />
            </figure>
          </div>
        )}
        {hasMinuteDetail && (
          <details className="technique-audit" aria-label="候选分钟">
            <summary>
              候选分钟
              <small>{grouped.length} 个时刻</small>
            </summary>
            {scoringMinutes.length > 0 && (
            <>
            <p className="rectification-board__group">换升时刻</p>
            <ol className="rectification-board__minutes">
              {scoringMinutes.map((row) => {
                const changed = changedMinutes.has(row.at);
                const working = row.at === workingTime;
                return (
                  <li
                    key={row.at}
                    className={[
                      "rectification-board__minute",
                      changed ? "is-changed" : "",
                      working ? "is-working" : "",
                    ].filter(Boolean).join(" ")}
                  >
                    <time dateTime={row.at}>{row.at}</time>
                    {working ? <span className="rectification-board__minute-note">当前时间</span> : null}
                    {changed ? <span className="rectification-board__minute-note">已更新</span> : null}
                    <LayerChips layers={row.scoringLayers} />
                  </li>
                );
              })}
            </ol>
            </>
            )}
            {displayMinutes.length > 0 && (
              <details className="technique-audit">
                <summary>
                  次级候选
                  <small>{displayMinutes.length} 个时刻</small>
                </summary>
                <ol className="rectification-board__minutes">
                  {displayMinutes.map((row) => (
                    <li
                      key={`display-${row.at}`}
                      className={changedMinutes.has(row.at) ? "rectification-board__minute is-changed" : "rectification-board__minute"}
                    >
                      <time dateTime={row.at}>{row.at}</time>
                      {changedMinutes.has(row.at) ? <span className="rectification-board__minute-note">已更新</span> : null}
                      <LayerChips layers={row.displayLayers} />
                    </li>
                  ))}
                </ol>
              </details>
            )}
          </details>
        )}
        {hasParameterDetail && (
          <details className="technique-audit" aria-label="参数与口径">
            <summary>参数与口径</summary>
            {table && (
              <>
                <details className="technique-audit">
                  <summary>本命宫位表</summary>
                  <RectificationHouseTableView
                    table={table}
                    changedHouses={changedHouses}
                    lagnaChanged={diff.lagnaChanged}
                  />
                </details>
                {result && <ConfirmationGateDisclosure gate={result.confirmationGate} />}
                {savedStatus === "accepted" && result && result.techniqueAudit.length > 0 && (
                  <TechniqueAuditDisclosure rows={result.techniqueAudit} />
                )}
              </>
            )}
            {contrast && (
              <details className="technique-audit">
                <summary>两段本命上升</summary>
                <div className="rectification-board__disclosure">
                  <p>{engineMeaningToDisplayCopy(contrast.user_meaning)}</p>
                  <ul>
                    {contrast.intervals.map((interval) => (
                      <li key={`${interval.start}-${interval.end}`}>
                        {interval.start}-{interval.end}：{interval.lagna}
                        {interval.lords.l1 ? `；一/四/七/十宫主 ${[interval.lords.l1, interval.lords.l4, interval.lords.l7, interval.lords.l10].filter(Boolean).join("、")}` : ""}
                      </li>
                    ))}
                  </ul>
                </div>
              </details>
            )}
            {ledger.length > 0 && (
              <details className="technique-audit">
                <summary>
                  经历与大运对照
                  <small>{ledger.length} 项</small>
                </summary>
                <ul className="rectification-board__disclosure">
                  {ledger.map((item) => (
                    <li key={item.summary}>{engineMeaningToDisplayCopy(item.user_meaning)}</li>
                  ))}
                </ul>
                {agreement ? <p className="rectification-board__disclosure">{engineMeaningToDisplayCopy(agreement.user_meaning)}</p> : null}
              </details>
            )}
            {nakshatra?.near_boundary && nakshatra.user_meaning && (
              <details className="technique-audit">
                <summary>交界节奏</summary>
                <p className="rectification-board__disclosure">{engineMeaningToDisplayCopy(nakshatra.user_meaning)}</p>
              </details>
            )}
          </details>
        )}
      </div>
    </>
  );
}

export function RectificationBoard({
  result,
  declaredTime,
  birthTimeSource,
  savedStatus,
  diff,
  compact,
  open,
  boardId,
  titleId,
  onClose,
}: Readonly<{
  result: RectificationCandidateResult | null;
  declaredTime: string | null;
  birthTimeSource?: string | null;
  savedStatus: "accepted" | "confirmed" | null;
  diff: RectificationBoardDiff;
  compact: boolean;
  open: boolean;
  boardId: string;
  titleId: string;
  onClose: () => void;
}>) {
  const sheetRef = useRef<HTMLElement>(null);

  useEffect(() => {
    if (!compact || !open) return;
    /* preventScroll for the same reason as the choice options: this sheet
       lives in the panel's grid cell, and the browser would scroll the
       panel to reach it. */
    sheetRef.current?.focus({ preventScroll: true });
    const handleKey = (event: KeyboardEvent) => {
      if (event.key === "Escape") onClose();
    };
    window.addEventListener("keydown", handleKey);
    return () => window.removeEventListener("keydown", handleKey);
  }, [compact, open, onClose]);

  if (compact && !open) return null;

  const sheet = (
    <aside
      ref={sheetRef}
      id={boardId}
      className={`rectification-board${compact ? " is-sheet" : ""}`}
      aria-labelledby={titleId}
      role={compact ? "dialog" : undefined}
      aria-modal={compact ? true : undefined}
      tabIndex={compact ? -1 : undefined}
    >
      <RectificationBoardBody
        result={result}
        declaredTime={declaredTime}
        birthTimeSource={birthTimeSource}
        savedStatus={savedStatus}
        diff={diff}
        compact={compact}
        titleId={titleId}
        onClose={onClose}
      />
    </aside>
  );

  if (!compact) return sheet;

  return (
    <div className="rectification-board-overlay">
      <div className="rectification-board-scrim" aria-hidden="true" onClick={onClose} />
      {sheet}
    </div>
  );
}

export function RectificationBoardPeek({
  result,
  declaredTime = null,
  birthTimeSource,
  expanded,
  boardId,
  onOpen,
}: Readonly<{
  result: RectificationCandidateResult | null;
  declaredTime?: string | null;
  birthTimeSource?: string | null;
  expanded: boolean;
  boardId: string;
  onOpen: () => void;
}>) {
  const peek = rectificationBoardPeekCopy(result, declaredTime, birthTimeSource);
  return (
    <button
      className="rectification-board-peek"
      type="button"
      aria-label={peek.detail ? `${peek.title}，${peek.detail}` : peek.title}
      aria-expanded={expanded}
      aria-controls={boardId}
      onClick={onOpen}
    >
      <strong>{peek.title}</strong>
      <span>{peek.detail}</span>
    </button>
  );
}