import 'package:flutter/material.dart';
import 'package:aesthetica_wallpaper/models/puzzle_game_interface.dart';

/// 拖拽式拼图块数据模型
class DragPuzzlePiece {
  final int id; // 唯一标识
  final int correctRow; // 正确的行位置
  final int correctCol; // 正确的列位置
  final ImageProvider image; // 图片块
  bool isPlaced; // 是否已放置到正确位置
  int? currentRow; // 当前行位置（如果已放置）
  int? currentCol; // 当前列位置（如果已放置）

  DragPuzzlePiece({
    required this.id,
    required this.correctRow,
    required this.correctCol,
    required this.image,
    this.isPlaced = false,
    this.currentRow,
    this.currentCol,
  });

  bool get isCorrectlyPlaced =>
      isPlaced && currentRow == correctRow && currentCol == correctCol;

  DragPuzzlePiece copyWith({
    int? id,
    int? correctRow,
    int? correctCol,
    ImageProvider? image,
    bool? isPlaced,
    int? currentRow,
    int? currentCol,
  }) {
    return DragPuzzlePiece(
      id: id ?? this.id,
      correctRow: correctRow ?? this.correctRow,
      correctCol: correctCol ?? this.correctCol,
      image: image ?? this.image,
      isPlaced: isPlaced ?? this.isPlaced,
      currentRow: currentRow ?? this.currentRow,
      currentCol: currentCol ?? this.currentCol,
    );
  }
}

/// 拖拽式拼图游戏状态
class DragPuzzleGame implements IPuzzleGame {
  final List<DragPuzzlePiece> pieces; // 所有拼图块
  final int gridRows; // 网格行数
  final int gridCols; // 网格列数
  final Duration elapsedTime; // 已用时间
  final int moves; // 移动次数
  final bool isComplete; // 是否完成
  final String imagePath; // 原图路径

  DragPuzzleGame({
    required this.pieces,
    required this.gridRows,
    required this.gridCols,
    this.elapsedTime = Duration.zero,
    this.moves = 0,
    this.isComplete = false,
    required this.imagePath,
  });

  /// 获取未放置的拼图块
  List<DragPuzzlePiece> get unplacedPieces =>
      pieces.where((piece) => !piece.isPlaced).toList();

  /// 获取已放置的拼图块
  List<DragPuzzlePiece> get placedPieces =>
      pieces.where((piece) => piece.isPlaced).toList();

  /// 检查游戏是否完成
  bool checkComplete() {
    return pieces.every((piece) => piece.isCorrectlyPlaced);
  }

  /// 获取指定位置的拼图块
  DragPuzzlePiece? getPieceAt(int row, int col) {
    try {
      return pieces.firstWhere(
        (piece) =>
            piece.isPlaced &&
            piece.currentRow == row &&
            piece.currentCol == col,
      );
    } catch (e) {
      return null;
    }
  }

  @override
  String get difficultyLabel {
    return '${gridRows}x$gridCols';
  }

  /// 获取星级评分
  @override
  int getStarRating() {
    if (!isComplete) return 0;

    final totalPieces = gridRows * gridCols;
    final optimalMoves = totalPieces; // 理想情况下每个块只移动一次
    final optimalTime = Duration(minutes: totalPieces ~/ 4); // 理想时间

    int stars = 1;
    if (moves <= optimalMoves && elapsedTime <= optimalTime) {
      stars = 3;
    } else if (moves <= optimalMoves * 1.5 ||
        elapsedTime <= optimalTime * 1.5) {
      stars = 2;
    }

    return stars;
  }

  DragPuzzleGame copyWith({
    List<DragPuzzlePiece>? pieces,
    int? gridRows,
    int? gridCols,
    Duration? elapsedTime,
    int? moves,
    bool? isComplete,
    String? imagePath,
  }) {
    return DragPuzzleGame(
      pieces: pieces ?? this.pieces,
      gridRows: gridRows ?? this.gridRows,
      gridCols: gridCols ?? this.gridCols,
      elapsedTime: elapsedTime ?? this.elapsedTime,
      moves: moves ?? this.moves,
      isComplete: isComplete ?? this.isComplete,
      imagePath: imagePath ?? this.imagePath,
    );
  }
}

/// 拖拽式拼图难度
enum DragPuzzleDifficulty {
  beginner(2, 2, 'Beginner', '2x2'),
  easy(3, 2, 'Easy', '3x2'),
  medium(4, 3, 'Medium', '4x3'),
  hard(5, 4, 'Hard', '5x4'),
  expert(6, 5, 'Expert', '6x5');

  final int rows;
  final int cols;
  final String label;
  final String description;

  const DragPuzzleDifficulty(
    this.rows,
    this.cols,
    this.label,
    this.description,
  );

  int get totalPieces => rows * cols;
}