'use client';

import { useCallback, useEffect, useRef, useState, type ReactNode } from 'react';
import Dice from './dice';
import ChatFeedPanel, { type ChatFeedItem } from './chat-feed';
import { Chessman } from './chessman';
import ChessmanPiece from './chessman-piece';
import { applyLandEvent, type PlaneCell } from './cell-event';
import { getAssets } from './asset-storage';
import { SHOW_DEBUG_UI } from '@/lib/ui/debug';
import {
  buildPlaneCells,
  cellColorFor,
  DEFAULT_PLANE_SIZE,
  diceAreaSpan,
  getOrCreateBoardConfig,
  perimeterLength,
} from './board-config';

const STEP_MS = 280;

function cellLabel(cell: PlaneCell | undefined, index: number) {
  if (!cell) return '';
  return index === 0 ? '시작' : cell.type;
}

export default function DicePlane({
  requireDiceQueue = false,
  diceQueue = 0,
  onConsumeDice,
  chatFeed = [],
  showChatFeed = false,
  settingsButton = null,
}: {
  requireDiceQueue?: boolean;
  diceQueue?: number;
  onConsumeDice?: (count?: number) => Promise<{ ok: boolean; error?: string }>;
  chatFeed?: ChatFeedItem[];
  showChatFeed?: boolean;
  /** 판 안쪽 왼쪽 아래(둘레 칸 밖)에 배치할 설정 버튼 */
  settingsButton?: ReactNode;
}) {
  const [boardReady, setBoardReady] = useState(false);
  const [planeSize, setPlaneSize] = useState<{ width: number; height: number }>({
    width: DEFAULT_PLANE_SIZE.width,
    height: DEFAULT_PLANE_SIZE.height,
  });
  const [dicePlaneArray, setDicePlaneArray] = useState<PlaneCell[]>([]);
  const chessmanRef = useRef(new Chessman(perimeterLength(DEFAULT_PLANE_SIZE.width, DEFAULT_PLANE_SIZE.height)));
  const boardRef = useRef(dicePlaneArray);
  const [chessmanIndex, setChessmanIndex] = useState(0);
  const [chessmanSrc, setChessmanSrc] = useState('/chessman/default.png');
  const [hopKey, setHopKey] = useState(0);
  const [moving, setMoving] = useState(false);
  const [chatOpen, setChatOpen] = useState(false);
  const [landedLabel, setLandedLabel] = useState<string | null>(null);
  const [landedKey, setLandedKey] = useState(0);
  const [statusText, setStatusText] = useState('시계방향');
  const [islandTurnsLeft, setIslandTurnsLeft] = useState(0);
  const [pickingDestination, setPickingDestination] = useState(false);
  const moveTimerRef = useRef<ReturnType<typeof setTimeout> | null>(null);
  const pendingRollRef = useRef(0);

  // SSR/초기 렌더에서 랜덤 판을 쓰지 않고, 브라우저에 저장된 설정을 로드
  useEffect(() => {
    const board = getOrCreateBoardConfig();
    const cells = buildPlaneCells(board);
    chessmanRef.current = new Chessman(cells.length, 0);
    boardRef.current = cells;
    setPlaneSize({ width: board.width, height: board.height });
    setChessmanIndex(0);
    setChessmanSrc(getAssets().chessman);
    setHopKey(0);
    setLandedLabel(null);
    setStatusText('시계방향');
    setIslandTurnsLeft(0);
    setPickingDestination(false);
    setDicePlaneArray(cells);
    setBoardReady(true);
  }, []);

  useEffect(() => {
    boardRef.current = dicePlaneArray;
  }, [dicePlaneArray]);

  useEffect(() => {
    return () => {
      if (moveTimerRef.current) clearTimeout(moveTimerRef.current);
    };
  }, []);

  const showBanner = useCallback((message: string) => {
    setLandedLabel(message);
    setLandedKey((k) => k + 1);
  }, []);

  const applyLanding = useCallback(
    (landIndex: number, roll: number) => {
      const man = chessmanRef.current;
      const result = applyLandEvent({
        chessman: man,
        board: boardRef.current,
        roll,
        landIndex,
      });

      setStatusText(man.facing === 1 ? '시계방향' : '반시계방향');
      setIslandTurnsLeft(man.islandTurnsLeft);

      if (result?.chooseDestination) {
        pendingRollRef.current = roll;
        setPickingDestination(true);
        showBanner(result.message);
        return;
      }

      setPickingDestination(false);

      if (result?.teleportTo != null) {
        setChessmanIndex(result.teleportTo);
        setHopKey((k) => k + 1);
        showBanner(result.message);
        return;
      }

      showBanner(result?.message ?? cellLabel(boardRef.current[landIndex], landIndex));
    },
    [showBanner],
  );

  const onCellPick = useCallback(
    (index: number) => {
      if (!pickingDestination || moving) return;
      const man = chessmanRef.current;
      man.teleport(index);
      setChessmanIndex(index);
      setHopKey((k) => k + 1);
      setPickingDestination(false);
      applyLanding(index, pendingRollRef.current);
    },
    [pickingDestination, moving, applyLanding],
  );

  const animateMove = useCallback(
    (steps: number, roll: number) => {
      const amount = Math.max(0, Math.trunc(steps));
      if (amount === 0) {
        setMoving(false);
        return;
      }

      setMoving(true);
      let remaining = amount;

      const stepOnce = () => {
        const next = chessmanRef.current.moveOne();
        setChessmanIndex(next);
        setHopKey((k) => k + 1);
        remaining -= 1;

        if (remaining > 0) {
          moveTimerRef.current = setTimeout(stepOnce, STEP_MS);
        } else {
          moveTimerRef.current = null;
          setMoving(false);
          applyLanding(next, roll);
        }
      };

      stepOnce();
    },
    [applyLanding],
  );

  const onDiceRolled = useCallback(
    (rollResult: { sum: number; faces: number[] }) => {
      const roll = Math.max(0, Math.trunc(rollResult.sum));
      if (roll === 0) return;

      setLandedLabel(null);
      setPickingDestination(false);
      const man = chessmanRef.current;

      if (man.isOnIsland) {
        const outcome = man.resolveIslandRoll(roll, rollResult.faces);
        setIslandTurnsLeft(man.islandTurnsLeft);
        if (outcome === 'wait') {
          showBanner(
            man.isOnIsland
              ? `무인도 대기 (남은 ${man.islandTurnsLeft}턴)`
              : '무인도 3턴 종료!',
          );
          return;
        }
        showBanner('무인도 탈출!');
      }

      animateMove(roll, roll);
    },
    [animateMove, showBanner],
  );

  const chessmanCell = dicePlaneArray[chessmanIndex] ?? dicePlaneArray[0];
  const diceSpan = diceAreaSpan(planeSize.width, planeSize.height);

  if (!boardReady || dicePlaneArray.length === 0) {
    return (
      <div
        style={{
          position: 'relative',
          width: '100%',
          height: '100%',
          display: 'flex',
          alignItems: 'center',
          justifyContent: 'center',
          color: 'rgba(255,255,255,0.7)',
          fontSize: 14,
        }}
      >
        판 불러오는 중…
      </div>
    );
  }

  return (
    <div style={{ position: 'relative', width: '100%', height: '100%' }}>
      <div
        style={{
          display: 'grid',
          gridTemplateColumns: `repeat(${planeSize.width}, minmax(0, 1fr))`,
          gridTemplateRows: `repeat(${planeSize.height}, minmax(0, 1fr))`,
          gap: 'clamp(6px, 1vw, 12px)',
          padding: 'clamp(8px, 1.2vw, 16px)',
          width: '100%',
          height: '100%',
          boxSizing: 'border-box',
        }}
      >
        {dicePlaneArray.map((plane, index) => {
          const isStart = index === 0;
          const isLanded = !moving && index === chessmanIndex && landedLabel != null;
          const showText = plane.contentVisible !== false;
          return (
            <div
              key={plane.id}
              role={pickingDestination ? 'button' : undefined}
              tabIndex={pickingDestination ? 0 : undefined}
              onClick={() => onCellPick(index)}
              onKeyDown={(e) => {
                if (!pickingDestination) return;
                if (e.key === 'Enter' || e.key === ' ') {
                  e.preventDefault();
                  onCellPick(index);
                }
              }}
              style={{
                gridColumn: plane.x + 1,
                gridRow: plane.y + 1,
                display: 'flex',
                alignItems: 'center',
                justifyContent: 'center',
                backgroundColor: cellColorFor(plane.eventId, index),
                backgroundImage: plane.imageSrc ? `url(${plane.imageSrc})` : undefined,
                backgroundSize: 'cover',
                backgroundPosition: 'center',
                color: 'white',
                borderRadius: 8,
                fontSize: 'clamp(11px, 1.6vw, 16px)',
                fontWeight: 600,
                textAlign: 'center',
                padding: 4,
                boxShadow: isLanded
                  ? '0 0 0 3px #fde68a, 0 0 18px rgba(253, 224, 71, 0.75)'
                  : pickingDestination
                    ? '0 0 0 2px rgba(125, 211, 252, 0.85)'
                    : isStart
                      ? 'inset 0 0 0 2px #a7f3d0'
                      : undefined,
                transform: isLanded ? 'scale(1.04)' : undefined,
                transition: 'box-shadow 180ms ease, transform 180ms ease',
                zIndex: pickingDestination ? 8 : isLanded ? 4 : undefined,
                cursor: pickingDestination ? 'pointer' : undefined,
                pointerEvents: pickingDestination ? 'auto' : undefined,
                textShadow: plane.imageSrc ? '0 1px 3px rgba(0,0,0,0.85)' : undefined,
              }}
            >
              {showText ? (isStart ? '시작' : plane.type) : null}
            </div>
          );
        })}

        {chessmanCell && (
          <ChessmanPiece
            x={chessmanCell.x}
            y={chessmanCell.y}
            hopKey={hopKey}
            src={chessmanSrc}
          />
        )}

        <div
          style={{
            gridColumn: `2 / ${2 + diceSpan}`,
            gridRow: `2 / ${2 + diceSpan}`,
            minWidth: 0,
            minHeight: 0,
            zIndex: 6,
            position: 'relative',
          }}
        >
          <Dice
            onRolled={onDiceRolled}
            disabled={moving || pickingDestination}
            requireDiceQueue={requireDiceQueue}
            diceQueue={diceQueue}
            onConsumeDice={onConsumeDice}
          />
        </div>

        {settingsButton && (
          <div
            style={{
              // 둘레 칸 밖: 안쪽 영역 왼쪽 아래
              gridColumn: 2,
              gridRow: Math.max(3, planeSize.height - 1),
              zIndex: 8,
              display: 'flex',
              alignItems: 'flex-end',
              justifyContent: 'flex-start',
              padding: 4,
              boxSizing: 'border-box',
              minWidth: 0,
              minHeight: 0,
              pointerEvents: 'none',
            }}
          >
            <div style={{ pointerEvents: 'auto' }}>{settingsButton}</div>
          </div>
        )}

        {showChatFeed && (
          <div
            style={{
              // 주사위 영역(왼쪽)과 겹치지 않는 안쪽 오른쪽 위 칸만 사용
              gridColumn: `${Math.max(2 + diceSpan, planeSize.width - 2)} / ${planeSize.width}`,
              gridRow: `2 / ${Math.min(4, planeSize.height)}`,
              zIndex: 7,
              minWidth: 0,
              minHeight: 0,
              display: 'flex',
              flexDirection: 'column',
              alignItems: 'stretch',
              gap: 4,
              padding: 4,
              boxSizing: 'border-box',
              overflow: 'hidden',
            }}
          >
            <label
              style={{
                alignSelf: 'flex-end',
                display: 'inline-flex',
                alignItems: 'center',
                gap: 5,
                margin: 0,
                padding: '3px 7px',
                borderRadius: 7,
                background: 'rgba(0,0,0,0.55)',
                color: '#fff',
                fontSize: 11,
                fontWeight: 600,
                cursor: 'pointer',
                userSelect: 'none',
                flexShrink: 0,
              }}
            >
              <input
                type="checkbox"
                checked={chatOpen}
                onChange={(e) => setChatOpen(e.target.checked)}
              />
              채팅
            </label>

            {chatOpen && (
              <div style={{ minHeight: 0, flex: 1, overflow: 'hidden' }}>
                <ChatFeedPanel items={chatFeed} visible compact />
              </div>
            )}
          </div>
        )}
      </div>

      {SHOW_DEBUG_UI && (
        <div className="pointer-events-none absolute bottom-3 left-3 z-20 rounded bg-black/65 px-3 py-1 text-sm text-white">
          {statusText}
          {islandTurnsLeft > 0 ? ` · 무인도 ${islandTurnsLeft}턴` : ''}
        </div>
      )}

      {landedLabel && (
        <div
          className="pointer-events-none absolute inset-0 z-30 flex items-center justify-center"
          aria-live="polite"
        >
          <div
            key={landedKey}
            style={{
              padding: 'clamp(12px, 2vw, 28px) clamp(20px, 4vw, 48px)',
              borderRadius: 16,
              background: 'rgba(15, 23, 42, 0.78)',
              color: '#fff7ed',
              fontSize: 'clamp(1.6rem, 6vw, 4rem)',
              fontWeight: 800,
              letterSpacing: '0.04em',
              textShadow: '0 4px 24px rgba(0,0,0,0.45)',
              boxShadow: '0 12px 40px rgba(0,0,0,0.35)',
              animation: 'drinkmarble-landed-pop 420ms ease-out',
              maxWidth: '80%',
              textAlign: 'center',
            }}
          >
            {landedLabel}
          </div>
        </div>
      )}
    </div>
  );
}