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

/// 拼图块数据模型
class PuzzlePiece {
  final int id; // 唯一标识
  final int correctPosition; // 正确位置
  int currentPosition; // 当前位置
  final ImageProvider image; // 图片块

  PuzzlePiece({
    required this.id,
    required this.correctPosition,
    required this.currentPosition,
    required this.image,
  });

  bool get isCorrect => currentPosition == correctPosition;

  PuzzlePiece copyWith({
    int? id,
    int? correctPosition,
    int? currentPosition,
    ImageProvider? image,
  }) {
    return PuzzlePiece(
      id: id ?? this.id,
      correctPosition: correctPosition ?? this.correctPosition,
      currentPosition: currentPosition ?? this.currentPosition,
      image: image ?? this.image,
    );
  }
}

/// 游戏模式
enum GameMode {
  classic, // 经典模式（滑动）
  challenge, // 挑战模式（限时）
  casual, // 休闲模式（无限制）
}

/// 游戏难度
enum GameDifficulty {
  easy(3, '简单', '3x3'),
  medium(4, '中等', '4x4'),
  hard(5, '困难', '5x5'),
  expert(6, '专家', '6x6');

  final int gridSize;
  final String label;
  final String description;

  const GameDifficulty(this.gridSize, this.label, this.description);
}

/// 拼图游戏状态
class PuzzleGame implements IPuzzleGame {
  List<PuzzlePiece> pieces;
  int moves;
  Duration elapsedTime;
  GameDifficulty difficulty;
  GameMode mode;
  bool isComplete;
  int? emptyPosition; // 空格位置（仅滑动模式）

  PuzzleGame({
    required this.pieces,
    this.moves = 0,
    this.elapsedTime = Duration.zero,
    required this.difficulty,
    this.mode = GameMode.classic,
    this.isComplete = false,
    this.emptyPosition,
  });

  int get gridSize => difficulty.gridSize;
  int get totalPieces => gridSize * gridSize;

  @override
  String get difficultyLabel => difficulty.label;

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

  /// 获取星级评分（1-3星）
  @override
  int getStarRating() {
    if (!isComplete) return 0;

    final optimalMoves = totalPieces * 2; // 理想步数
    final optimalTime = Duration(minutes: difficulty.gridSize); // 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;
  }

  PuzzleGame copyWith({
    List<PuzzlePiece>? pieces,
    int? moves,
    Duration? elapsedTime,
    GameDifficulty? difficulty,
    GameMode? mode,
    bool? isComplete,
    int? emptyPosition,
  }) {
    return PuzzleGame(
      pieces: pieces ?? this.pieces,
      moves: moves ?? this.moves,
      elapsedTime: elapsedTime ?? this.elapsedTime,
      difficulty: difficulty ?? this.difficulty,
      mode: mode ?? this.mode,
      isComplete: isComplete ?? this.isComplete,
      emptyPosition: emptyPosition ?? this.emptyPosition,
    );
  }
}

/// 游戏记录
class GameRecord {
  final String imageId;
  final GameDifficulty difficulty;
  final Duration time;
  final int moves;
  final int stars;
  final DateTime completedAt;

  GameRecord({
    required this.imageId,
    required this.difficulty,
    required this.time,
    required this.moves,
    required this.stars,
    required this.completedAt,
  });

  Map<String, dynamic> toJson() {
    return {
      'imageId': imageId,
      'difficulty': difficulty.name,
      'time': time.inSeconds,
      'moves': moves,
      'stars': stars,
      'completedAt': completedAt.toIso8601String(),
    };
  }

  factory GameRecord.fromJson(Map<String, dynamic> json) {
    return GameRecord(
      imageId: json['imageId'],
      difficulty: GameDifficulty.values.firstWhere(
        (d) => d.name == json['difficulty'],
      ),
      time: Duration(seconds: json['time']),
      moves: json['moves'],
      stars: json['stars'],
      completedAt: DateTime.parse(json['completedAt']),
    );
  }
}