import Phaser from 'phaser';
import type { OnitamaState, PlayerType, Pawn } from '@/game/onitama';
import { prompts } from '@/game/onitama';
import { GameHostScene } from 'boardgame-phaser';
import { spawnEffect } from 'boardgame-phaser';
import { effect } from '@preact/signals-core';
import type { MutableSignal } from 'boardgame-core';
import { PawnSpawner, CardSpawner, BOARD_OFFSET, CELL_SIZE, CARD_WIDTH, CARD_HEIGHT, boardToScreen, BOARD_SIZE } from '@/spawners';
import type { HighlightData } from '@/spawners/HighlightSpawner';
import { createOnitamaUIState, clearSelection, selectPiece, selectCard, deselectCard, setValidMoves } from '@/state';
import type { OnitamaUIState, ValidMove } from '@/state';

export class OnitamaScene extends GameHostScene<OnitamaState> {
  private boardContainer!: Phaser.GameObjects.Container;
  private gridGraphics!: Phaser.GameObjects.Graphics;
  private infoText!: Phaser.GameObjects.Text;
  private winnerOverlay?: Phaser.GameObjects.Container;
  private cardLabelContainers: Map<string, Phaser.GameObjects.Text> = new Map();
  
  // UI State managed by MutableSignal
  public uiState!: MutableSignal<OnitamaUIState>;
  private highlightContainers: Map<string, Phaser.GameObjects.GameObject> = new Map();
  private highlightDispose?: () => void;

  constructor() {
    super('OnitamaScene');
  }

  create(): void {
    super.create();

    // Create UI state signal
    this.uiState = createOnitamaUIState();

    // Cleanup effect on scene shutdown
    this.events.once('shutdown', () => {
      if (this.highlightDispose) {
        this.highlightDispose();
      }
    });

    this.boardContainer = this.add.container(0, 0);
    this.gridGraphics = this.add.graphics();
    this.drawBoard();

    // Add spawners
    this.disposables.add(spawnEffect(new PawnSpawner(this)));
    this.disposables.add(spawnEffect(new CardSpawner(this)));

    // Create card labels
    this.createCardLabels();

    // Setup highlight effect - react to validMoves changes
    this.highlightDispose = effect(() => {
      const validMoves = this.uiState.value.validMoves;
      this.updateHighlights(validMoves);
    });

    // Winner overlay effect
    this.addEffect(() => {
      const winner = this.state.winner;
      if (winner) {
        this.showWinner(winner);
      } else if (this.winnerOverlay) {
        this.winnerOverlay.destroy();
        this.winnerOverlay = undefined;
      }
    });

    // Info text
    this.infoText = this.add.text(
      BOARD_OFFSET.x + (BOARD_SIZE * CELL_SIZE) / 2,
      BOARD_OFFSET.y + BOARD_SIZE * CELL_SIZE + 30,
      '',
      {
        fontSize: '20px',
        fontFamily: 'Arial',
        color: '#4b5563',
      }
    ).setOrigin(0.5);

    // Update info text when UI state changes
    this.addEffect(() => {
      this.updateInfoText();
    });

    // Input handling
    this.setupInput();
  }

  private createCardLabels(): void {
    const boardLeft = BOARD_OFFSET.x;
    const boardTop = BOARD_OFFSET.y;
    const boardRight = BOARD_OFFSET.x + BOARD_SIZE * CELL_SIZE;

    // Red cards label
    const redLabel = this.add.text(
      boardLeft - CARD_WIDTH - 60 + CARD_WIDTH / 2,
      boardTop + 50 + 2 * (CARD_HEIGHT + 15) + 10,
      "RED's Cards",
      {
        fontSize: '16px',
        fontFamily: 'Arial',
        color: '#ef4444',
      }
    ).setOrigin(0.5, 0);
    this.cardLabelContainers.set('red', redLabel);

    // Black cards label
    const blackLabel = this.add.text(
      boardRight + 60 + CARD_WIDTH / 2,
      boardTop + 50 + 2 * (CARD_HEIGHT + 15) + 10,
      "BLACK's Cards",
      {
        fontSize: '16px',
        fontFamily: 'Arial',
        color: '#3b82f6',
      }
    ).setOrigin(0.5, 0);
    this.cardLabelContainers.set('black', blackLabel);

    // Spare card label
    const boardCenterX = boardLeft + (BOARD_SIZE * CELL_SIZE) / 2;
    const spareLabel = this.add.text(
      boardCenterX,
      boardTop - 50,
      'Spare Card',
      {
        fontSize: '16px',
        fontFamily: 'Arial',
        color: '#6b7280',
      }
    ).setOrigin(0.5, 0);
    this.cardLabelContainers.set('spare', spareLabel);
  }

  private updateInfoText(): void {
    const currentPlayer = this.state.currentPlayer;
    const selectedCard = this.uiState.value.selectedCard;
    const selectedPiece = this.uiState.value.selectedPiece;
    
    if (this.state.winner) {
      this.infoText.setText(`${this.state.winner} wins!`);
    } else if (!selectedCard) {
      this.infoText.setText(`${currentPlayer}'s turn - Select a card first`);
    } else if (!selectedPiece) {
      this.infoText.setText(`Card: ${selectedCard} - Select a piece to move`);
    } else {
      this.infoText.setText(`${currentPlayer}'s turn (Turn ${this.state.turn + 1})`);
    }
  }

  private drawBoard(): void {
    const g = this.gridGraphics;
    g.lineStyle(2, 0x6b7280);

    for (let i = 0; i <= BOARD_SIZE; i++) {
      g.lineBetween(
        BOARD_OFFSET.x + i * CELL_SIZE,
        BOARD_OFFSET.y,
        BOARD_OFFSET.x + i * CELL_SIZE,
        BOARD_OFFSET.y + BOARD_SIZE * CELL_SIZE
      );
      g.lineBetween(
        BOARD_OFFSET.x,
        BOARD_OFFSET.y + i * CELL_SIZE,
        BOARD_OFFSET.x + BOARD_SIZE * CELL_SIZE,
        BOARD_OFFSET.y + i * CELL_SIZE
      );
    }

    g.strokePath();

    this.add.text(
      BOARD_OFFSET.x + (BOARD_SIZE * CELL_SIZE) / 2,
      BOARD_OFFSET.y - 40,
      'Onitama',
      {
        fontSize: '28px',
        fontFamily: 'Arial',
        color: '#1f2937',
      }
    ).setOrigin(0.5);
  }

  private setupInput(): void {
    // Board cell clicks
    for (let row = 0; row < BOARD_SIZE; row++) {
      for (let col = 0; col < BOARD_SIZE; col++) {
        const pos = boardToScreen(col, row);

        const zone = this.add.zone(pos.x, pos.y, CELL_SIZE, CELL_SIZE).setInteractive();

        zone.on('pointerdown', () => {
          if (this.state.winner) return;
          this.handleCellClick(col, row);
        });
      }
    }
  }

  private handleCellClick(x: number, y: number): void {
    const pawn = this.getPawnAtPosition(x, y);

    // 如果没有选中卡牌，提示先选卡牌
    if (!this.uiState.value.selectedCard) {
      console.log('请先选择一张卡牌');
      return;
    }

    if (this.uiState.value.selectedPiece) {
      // 已经选中了棋子
      if (pawn && pawn.owner === this.state.currentPlayer) {
        // 点击了自己的另一个棋子，更新选择
        selectPiece(this.uiState, x, y);
        this.updateValidMoves();
        return;
      }

      const fromX = this.uiState.value.selectedPiece.x;
      const fromY = this.uiState.value.selectedPiece.y;

      if (pawn && pawn.owner === this.state.currentPlayer) {
        return;
      }

      // 尝试移动到目标位置，必须使用选中的卡牌
      const validMoves = this.getValidMovesForPiece(fromX, fromY, [this.uiState.value.selectedCard]);
      
      const targetMove = validMoves.find(m => m.toX === x && m.toY === y);
      if (targetMove) {
        this.executeMove(targetMove);
      }
    } else {
      // 还没有选中棋子
      if (pawn && pawn.owner === this.state.currentPlayer) {
        selectPiece(this.uiState, x, y);
        this.updateValidMoves();
      }
    }
  }

  public onCardClick(cardId: string): void {
    // 只能选择当前玩家的手牌
    const currentPlayer = this.state.currentPlayer;
    const playerCards = currentPlayer === 'red' ? this.state.redCards : this.state.blackCards;
    
    if (!playerCards.includes(cardId)) {
      return;
    }

    selectCard(this.uiState, cardId);
    // 如果已经选中了棋子，更新有效移动
    if (this.uiState.value.selectedPiece) {
      this.updateValidMoves();
    }
  }

  private updateValidMoves(): void {
    const selectedPiece = this.uiState.value.selectedPiece;
    const selectedCard = this.uiState.value.selectedCard;
    
    if (!selectedPiece || !selectedCard) {
      setValidMoves(this.uiState, []);
      return;
    }

    const moves = this.getValidMovesForPiece(selectedPiece.x, selectedPiece.y, [selectedCard]);
    setValidMoves(this.uiState, moves);
  }

  public onHighlightClick(data: HighlightData): void {
    clearSelection(this.uiState);
    this.executeMove({
      card: data.card,
      fromX: data.fromX,
      fromY: data.fromY,
      toX: data.toX,
      toY: data.toY,
    });
  }

  private executeMove(move: { card: string; fromX: number; fromY: number; toX: number; toY: number }): void {
    const error = this.gameHost.tryAnswerPrompt(
      prompts.move,
      this.state.currentPlayer,
      move.card,
      move.fromX,
      move.fromY,
      move.toX,
      move.toY
    );
    if (error) {
      console.warn('Invalid move:', error);
    }
  }

  private updateHighlights(validMoves: ValidMove[]): void {
    // Clear old highlights
    for (const [, circle] of this.highlightContainers) {
      circle.destroy();
    }
    this.highlightContainers.clear();

    // Create new highlights
    for (const move of validMoves) {
      const key = `${move.card}-${move.toX}-${move.toY}`;
      const pos = boardToScreen(move.toX, move.toY);

      const circle = this.add.circle(pos.x, pos.y, CELL_SIZE / 3, 0x3b82f6, 0.3).setDepth(100);
      circle.setInteractive({ useHandCursor: true });
      circle.on('pointerdown', () => {
        this.onHighlightClick({
          key,
          x: pos.x,
          y: pos.y,
          card: move.card,
          fromX: move.fromX,
          fromY: move.fromY,
          toX: move.toX,
          toY: move.toY,
        });
      });

      this.highlightContainers.set(key, circle as Phaser.GameObjects.GameObject);
    }
  }

  private getValidMovesForPiece(
    fromX: number,
    fromY: number,
    cardNames: string[]
  ): ValidMove[] {
    const moves: ValidMove[] = [];
    const player = this.state.currentPlayer;

    for (const cardName of cardNames) {
      const card = this.state.cards[cardName];
      if (!card) continue;

      for (const move of card.moveCandidates) {
        const toX = fromX + move.dx;
        const toY = fromY + move.dy;

        if (this.isValidMove(fromX, fromY, toX, toY, player)) {
          moves.push({ card: cardName, fromX, fromY, toX, toY });
        }
      }
    }

    return moves;
  }

  private isValidMove(fromX: number, fromY: number, toX: number, toY: number, player: PlayerType): boolean {
    if (toX < 0 || toX >= BOARD_SIZE || toY < 0 || toY >= BOARD_SIZE) {
      return false;
    }

    const targetPawn = this.getPawnAtPosition(toX, toY);
    if (targetPawn && targetPawn.owner === player) {
      return false;
    }

    const pawn = this.getPawnAtPosition(fromX, fromY);
    if (!pawn || pawn.owner !== player) {
      return false;
    }

    return true;
  }

  private getPawnAtPosition(x: number, y: number): Pawn | null {
    const key = `${x},${y}`;
    const pawnId = this.state.regions.board.partMap[key];
    return pawnId ? this.state.pawns[pawnId] : null;
  }

  private showWinner(winner: string): void {
    if (this.winnerOverlay) {
      this.winnerOverlay.destroy();
    }

    this.winnerOverlay = this.add.container();

    const text = winner === 'draw' ? "It's a draw!" : `${winner} wins!`;

    const bg = this.add.rectangle(
      BOARD_OFFSET.x + (BOARD_SIZE * CELL_SIZE) / 2,
      BOARD_OFFSET.y + (BOARD_SIZE * CELL_SIZE) / 2,
      BOARD_SIZE * CELL_SIZE,
      BOARD_SIZE * CELL_SIZE,
      0x000000,
      0.6
    ).setInteractive({ useHandCursor: true });

    bg.on('pointerdown', () => {
      this.gameHost.start();
    });

    this.winnerOverlay.add(bg);

    const winText = this.add.text(
      BOARD_OFFSET.x + (BOARD_SIZE * CELL_SIZE) / 2,
      BOARD_OFFSET.y + (BOARD_SIZE * CELL_SIZE) / 2,
      text,
      {
        fontSize: '36px',
        fontFamily: 'Arial',
        color: '#fbbf24',
      }
    ).setOrigin(0.5);

    this.winnerOverlay.add(winText);

    this.tweens.add({
      targets: winText,
      scale: 1.2,
      duration: 500,
      yoyo: true,
      repeat: 1,
    });
  }
}