import { _decorator, sys } from 'cc';
const { ccclass, property } = _decorator;

/**
 * 玩家数据结构
 */
export interface PlayerData {
    // 基本信息
    playerId: string;
    playerName: string;
    createTime: number;
    lastPlayTime: number;
    totalPlayTime: number;
    
    // 等级和经验
    playerLevel: number;
    experience: number;
    experienceToNext: number;
    
    // 货币系统
    coins: number;           // 金币
    diamonds: number;        // 钻石
    gems: number;           // 宝石
    
    // 关卡进度
    currentLevel: number;
    maxUnlockedLevel: number;
    levelProgress: { [levelId: number]: LevelProgress };
    
    // 道具和装备
    inventory: InventoryData;
    
    // 统计数据
    statistics: GameStatistics;
    
    // 设置
    settings: PlayerSettings;
}

/**
 * 关卡进度数据
 */
export interface LevelProgress {
    levelId: number;
    completed: boolean;
    bestScore: number;
    bestTime: number;
    stars: number;
    attempts: number;
    firstClearTime: number;
    lastPlayTime: number;
    rewards: RewardData[];
}

/**
 * 背包数据
 */
export interface InventoryData {
    weapons: { [weaponId: string]: WeaponData };
    items: { [itemId: string]: ItemData };
    materials: { [materialId: string]: number };
    capacity: number;
    usedSlots: number;
}

/**
 * 武器数据
 */
export interface WeaponData {
    weaponId: string;
    level: number;
    experience: number;
    rarity: string;
    obtainTime: number;
    upgradeCount: number;
    isEquipped: boolean;
}

/**
 * 道具数据
 */
export interface ItemData {
    itemId: string;
    count: number;
    obtainTime: number;
    lastUsedTime: number;
}

/**
 * 奖励数据
 */
export interface RewardData {
    type: 'coins' | 'diamonds' | 'gems' | 'weapon' | 'item' | 'experience';
    id?: string;
    amount: number;
    obtainTime: number;
    source: string; // 获得来源：level_complete, daily_reward, shop_purchase等
}

/**
 * 游戏统计数据
 */
export interface GameStatistics {
    totalGamesPlayed: number;
    totalWins: number;
    totalLosses: number;
    totalScore: number;
    totalEnemiesDefeated: number;
    totalShotsfired: number;
    totalDamageDealt: number;
    totalTimePlayed: number;
    highestLevel: number;
    consecutiveWins: number;
    bestWinStreak: number;
    favoriteWeapon: string;
    weaponsUnlocked: number;
    itemsCollected: number;
}

/**
 * 玩家设置
 */
export interface PlayerSettings {
    soundEnabled: boolean;
    musicEnabled: boolean;
    soundVolume: number;
    musicVolume: number;
    vibrationEnabled: boolean;
    autoSaveEnabled: boolean;
    language: string;
    graphics: 'low' | 'medium' | 'high';
}

/**
 * 存档管理器
 * 负责玩家数据的保存、加载和管理
 */
@ccclass('SaveDataManager')
export class SaveDataManager {
    private static instance: SaveDataManager = null;
    
    private playerData: PlayerData = null;
    private initialized: boolean = false;
    private autoSaveInterval: number = 30; // 自动保存间隔（秒）
    private lastSaveTime: number = 0;
    
    // 存档文件键名
    private readonly SAVE_KEY = 'pong_game_save_data';
    private readonly BACKUP_KEY = 'pong_game_save_data_backup';
    private readonly SETTINGS_KEY = 'pong_game_settings';
    
    private constructor() {
        // 私有构造函数，确保单例模式
    }
    
    public static getInstance(): SaveDataManager {
        if (SaveDataManager.instance === null) {
            SaveDataManager.instance = new SaveDataManager();
        }
        return SaveDataManager.instance;
    }
    
    /**
     * 初始化存档管理器
     */
    public initialize(): void {
        if (this.initialized) return;
        
        this.loadPlayerData();
        this.initialized = true;
    }
    
    /**
     * 加载玩家数据
     */
    private loadPlayerData(): void {
        try {
            const savedData = sys.localStorage.getItem(this.SAVE_KEY);
            
            if (savedData) {
                const data = JSON.parse(savedData);
                this.playerData = this.validateAndMigrateData(data);
                this.playerData.lastPlayTime = Date.now();
            } else {
                this.createNewPlayerData();
            }
        } catch (error) {
            console.error('❌ 存档数据加载失败，尝试加载备份:', error);
            this.loadBackupData();
        }
    }
    
    /**
     * 加载备份数据
     */
    private loadBackupData(): void {
        try {
            const backupData = sys.localStorage.getItem(this.BACKUP_KEY);
            
            if (backupData) {
                const data = JSON.parse(backupData);
                this.playerData = this.validateAndMigrateData(data);
                this.playerData.lastPlayTime = Date.now();
            } else {
                this.createNewPlayerData();
            }
        } catch (error) {
            console.error('❌ 备份数据加载失败，创建新存档:', error);
            this.createNewPlayerData();
        }
    }
    
    /**
     * 创建新的玩家数据
     */
    private createNewPlayerData(): void {
        this.playerData = {
            playerId: this.generatePlayerId(),
            playerName: 'Player',
            createTime: Date.now(),
            lastPlayTime: Date.now(),
            totalPlayTime: 0,
            
            playerLevel: 1,
            experience: 0,
            experienceToNext: 100,
            
            coins: 1000,        // 初始金币
            diamonds: 50,       // 初始钻石
            gems: 0,
            
            currentLevel: 1,
            maxUnlockedLevel: 1,
            levelProgress: {},
            
            inventory: {
                weapons: {},
                items: {},
                materials: {},
                capacity: 50,
                usedSlots: 0
            },
            
            statistics: {
                totalGamesPlayed: 0,
                totalWins: 0,
                totalLosses: 0,
                totalScore: 0,
                totalEnemiesDefeated: 0,
                totalShotsfired: 0,
                totalDamageDealt: 0,
                totalTimePlayed: 0,
                highestLevel: 1,
                consecutiveWins: 0,
                bestWinStreak: 0,
                favoriteWeapon: '',
                weaponsUnlocked: 0,
                itemsCollected: 0
            },
            
            settings: {
                soundEnabled: true,
                musicEnabled: true,
                soundVolume: 0.8,
                musicVolume: 0.6,
                vibrationEnabled: true,
                autoSaveEnabled: true,
                language: 'zh-CN',
                graphics: 'medium'
            }
        };
        
        this.savePlayerData();
    }
    
    /**
     * 验证和迁移数据（用于版本兼容）
     */
    private validateAndMigrateData(data: any): PlayerData {
        // 确保所有必要字段存在
        const defaultData = this.createDefaultPlayerData();
        
        return {
            ...defaultData,
            ...data,
            // 确保嵌套对象也被正确合并
            inventory: { ...defaultData.inventory, ...data.inventory },
            statistics: { ...defaultData.statistics, ...data.statistics },
            settings: { ...defaultData.settings, ...data.settings }
        };
    }
    
    /**
     * 创建默认玩家数据模板
     */
    private createDefaultPlayerData(): PlayerData {
        return {
            playerId: this.generatePlayerId(),
            playerName: 'Player',
            createTime: Date.now(),
            lastPlayTime: Date.now(),
            totalPlayTime: 0,
            playerLevel: 1,
            experience: 0,
            experienceToNext: 100,
            coins: 1000,
            diamonds: 50,
            gems: 0,
            currentLevel: 1,
            maxUnlockedLevel: 1,
            levelProgress: {},
            inventory: {
                weapons: {},
                items: {},
                materials: {},
                capacity: 50,
                usedSlots: 0
            },
            statistics: {
                totalGamesPlayed: 0,
                totalWins: 0,
                totalLosses: 0,
                totalScore: 0,
                totalEnemiesDefeated: 0,
                totalShotsfired: 0,
                totalDamageDealt: 0,
                totalTimePlayed: 0,
                highestLevel: 1,
                consecutiveWins: 0,
                bestWinStreak: 0,
                favoriteWeapon: '',
                weaponsUnlocked: 0,
                itemsCollected: 0
            },
            settings: {
                soundEnabled: true,
                musicEnabled: true,
                soundVolume: 0.8,
                musicVolume: 0.6,
                vibrationEnabled: true,
                autoSaveEnabled: true,
                language: 'zh-CN',
                graphics: 'medium'
            }
        };
    }
    
    /**
     * 保存玩家数据
     */
    public savePlayerData(force: boolean = false): void {
        if (!this.playerData) return;
        
        const currentTime = Date.now();
        
        // 检查是否需要保存（避免频繁保存）
        if (!force && currentTime - this.lastSaveTime < 5000) {
            return;
        }
        
        try {
            // 更新最后保存时间
            this.playerData.lastPlayTime = currentTime;
            
            // 创建备份
            const currentData = sys.localStorage.getItem(this.SAVE_KEY);
            if (currentData) {
                sys.localStorage.setItem(this.BACKUP_KEY, currentData);
            }
            
            // 保存当前数据
            const dataToSave = JSON.stringify(this.playerData);
            sys.localStorage.setItem(this.SAVE_KEY, dataToSave);
            
            this.lastSaveTime = currentTime;
        } catch (error) {
            console.error('❌ 玩家数据保存失败:', error);
        }
    }
    
    /**
     * 自动保存检查
     */
    public checkAutoSave(): void {
        if (!this.playerData || !this.playerData.settings.autoSaveEnabled) return;
        
        const currentTime = Date.now();
        if (currentTime - this.lastSaveTime > this.autoSaveInterval * 1000) {
            this.savePlayerData();
        }
    }
    
    // === 玩家基本信息管理 ===
    
    public getPlayerData(): PlayerData {
        return this.playerData;
    }
    
    public getPlayerLevel(): number {
        return this.playerData?.playerLevel || 1;
    }
    
    public getCurrentLevel(): number {
        return this.playerData?.currentLevel || 1;
    }
    
    public getMaxUnlockedLevel(): number {
        return this.playerData?.maxUnlockedLevel || 1;
    }
    
    public getCoins(): number {
        return this.playerData?.coins || 0;
    }
    
    public getDiamonds(): number {
        return this.playerData?.diamonds || 0;
    }
    
    public getGems(): number {
        return this.playerData?.gems || 0;
    }
    
    // === 关卡进度管理 ===
    
    /**
     * 完成关卡
     */
    public completeLevel(levelId: number, score: number, time: number, stars: number): void {
        if (!this.playerData) return;
        
        // 更新关卡进度
        if (!this.playerData.levelProgress[levelId]) {
            this.playerData.levelProgress[levelId] = {
                levelId: levelId,
                completed: false,
                bestScore: 0,
                bestTime: 0,
                stars: 0,
                attempts: 0,
                firstClearTime: 0,
                lastPlayTime: 0,
                rewards: []
            };
        }
        
        const progress = this.playerData.levelProgress[levelId];
        progress.attempts += 1;
        progress.lastPlayTime = Date.now();
        
        // 首次完成
        if (!progress.completed) {
            progress.completed = true;
            progress.firstClearTime = Date.now();
            
            // 解锁下一关
            if (levelId === this.playerData.maxUnlockedLevel) {
                this.playerData.maxUnlockedLevel = levelId + 1;
            }
        }
        
        // 更新最佳记录
        if (score > progress.bestScore) {
            progress.bestScore = score;
        }
        
        if (time > 0 && (progress.bestTime === 0 || time < progress.bestTime)) {
            progress.bestTime = time;
        }
        
        if (stars > progress.stars) {
            progress.stars = stars;
        }
        
        // 更新统计数据
        this.playerData.statistics.totalGamesPlayed += 1;
        this.playerData.statistics.totalWins += 1;
        this.playerData.statistics.totalScore += score;
        this.playerData.statistics.consecutiveWins += 1;
        
        if (this.playerData.statistics.consecutiveWins > this.playerData.statistics.bestWinStreak) {
            this.playerData.statistics.bestWinStreak = this.playerData.statistics.consecutiveWins;
        }
        
        if (levelId > this.playerData.statistics.highestLevel) {
            this.playerData.statistics.highestLevel = levelId;
        }
        
        // 给予经验值
        this.addExperience(score / 10 + stars * 20);
        
        // 计算并给予奖励
        this.giveCompletionRewards(levelId, stars);
        
        this.savePlayerData();
    }
    
    /**
     * 关卡失败
     */
    public failLevel(levelId: number): void {
        if (!this.playerData) return;
        
        // 更新关卡进度
        if (!this.playerData.levelProgress[levelId]) {
            this.playerData.levelProgress[levelId] = {
                levelId: levelId,
                completed: false,
                bestScore: 0,
                bestTime: 0,
                stars: 0,
                attempts: 0,
                firstClearTime: 0,
                lastPlayTime: 0,
                rewards: []
            };
        }
        
        const progress = this.playerData.levelProgress[levelId];
        progress.attempts += 1;
        progress.lastPlayTime = Date.now();
        
        // 更新统计数据
        this.playerData.statistics.totalGamesPlayed += 1;
        this.playerData.statistics.totalLosses += 1;
        this.playerData.statistics.consecutiveWins = 0;
        
        this.savePlayerData();
    }
    
    /**
     * 获取关卡进度
     */
    public getLevelProgress(levelId: number): LevelProgress | null {
        return this.playerData?.levelProgress[levelId] || null;
    }
    
    /**
     * 检查关卡是否已解锁
     */
    public isLevelUnlocked(levelId: number): boolean {
        return levelId <= (this.playerData?.maxUnlockedLevel || 1);
    }
    
    /**
     * 检查关卡是否已完成
     */
    public isLevelCompleted(levelId: number): boolean {
        const progress = this.getLevelProgress(levelId);
        return progress?.completed || false;
    }
    
    // === 货币管理 ===
    
    /**
     * 添加金币
     */
    public addCoins(amount: number, source: string = 'unknown'): boolean {
        if (!this.playerData || amount <= 0) return false;
        
        this.playerData.coins += amount;
        this.addReward('coins', '', amount, source);
        
        return true;
    }
    
    /**
     * 消费金币
     */
    public spendCoins(amount: number): boolean {
        if (!this.playerData || amount <= 0 || this.playerData.coins < amount) {
            return false;
        }
        
        this.playerData.coins -= amount;
        return true;
    }
    
    /**
     * 添加钻石
     */
    public addDiamonds(amount: number, source: string = 'unknown'): boolean {
        if (!this.playerData || amount <= 0) return false;
        
        this.playerData.diamonds += amount;
        this.addReward('diamonds', '', amount, source);
        
        return true;
    }
    
    /**
     * 消费钻石
     */
    public spendDiamonds(amount: number): boolean {
        if (!this.playerData || amount <= 0 || this.playerData.diamonds < amount) {
            return false;
        }
        
        this.playerData.diamonds -= amount;
        return true;
    }
    
    /**
     * 添加宝石
     */
    public addGems(amount: number, source: string = 'unknown'): boolean {
        if (!this.playerData || amount <= 0) return false;
        
        this.playerData.gems += amount;
        this.addReward('gems', '', amount, source);
        
        return true;
    }
    
    // === 经验和等级管理 ===
    
    /**
     * 添加经验值
     */
    public addExperience(amount: number): boolean {
        if (!this.playerData || amount <= 0) return false;
        
        this.playerData.experience += amount;
        
        // 检查是否升级
        while (this.playerData.experience >= this.playerData.experienceToNext) {
            this.levelUp();
        }
        
        return true;
    }
    
    /**
     * 玩家升级
     */
    private levelUp(): void {
        this.playerData.experience -= this.playerData.experienceToNext;
        this.playerData.playerLevel += 1;
        
        // 计算下一级所需经验值
        this.playerData.experienceToNext = this.calculateExperienceToNext(this.playerData.playerLevel);
        
        // 升级奖励
        const coinReward = this.playerData.playerLevel * 100;
        const diamondReward = Math.floor(this.playerData.playerLevel / 5);
        
        this.addCoins(coinReward, 'level_up');
        if (diamondReward > 0) {
            this.addDiamonds(diamondReward, 'level_up');
        }
    }
    
    /**
     * 计算升级所需经验值
     */
    private calculateExperienceToNext(level: number): number {
        return 100 + (level - 1) * 50;
    }
    
    // === 道具和武器管理 ===
    
    /**
     * 添加武器
     */
    public addWeapon(weaponId: string, rarity: string = 'common'): boolean {
        if (!this.playerData) return false;
        
        if (!this.playerData.inventory.weapons[weaponId]) {
            this.playerData.inventory.weapons[weaponId] = {
                weaponId: weaponId,
                level: 1,
                experience: 0,
                rarity: rarity,
                obtainTime: Date.now(),
                upgradeCount: 0,
                isEquipped: false
            };
            
            this.playerData.statistics.weaponsUnlocked += 1;
            this.addReward('weapon', weaponId, 1, 'drop');
            
            return true;
        }
        
        return false;
    }
    
    /**
     * 添加道具
     */
    public addItem(itemId: string, count: number = 1): boolean {
        if (!this.playerData || count <= 0) return false;
        
        if (!this.playerData.inventory.items[itemId]) {
            this.playerData.inventory.items[itemId] = {
                itemId: itemId,
                count: 0,
                obtainTime: Date.now(),
                lastUsedTime: 0
            };
        }
        
        this.playerData.inventory.items[itemId].count += count;
        this.playerData.statistics.itemsCollected += count;
        this.addReward('item', itemId, count, 'drop');
        
        return true;
    }
    
    /**
     * 使用道具
     */
    public useItem(itemId: string, count: number = 1): boolean {
        if (!this.playerData || count <= 0) return false;
        
        const item = this.playerData.inventory.items[itemId];
        if (!item || item.count < count) {
            return false;
        }
        
        item.count -= count;
        item.lastUsedTime = Date.now();
        
        if (item.count === 0) {
            delete this.playerData.inventory.items[itemId];
        }
        
        return true;
    }
    
    // === 奖励管理 ===
    
    /**
     * 添加奖励记录
     */
    private addReward(type: RewardData['type'], id: string, amount: number, source: string): void {
        if (!this.playerData) return;
        
        const reward: RewardData = {
            type: type,
            id: id,
            amount: amount,
            obtainTime: Date.now(),
            source: source
        };
        
        // 这里可以添加到全局奖励历史记录中
        // 暂时不实现，避免数据过大
    }
    
    /**
     * 给予关卡完成奖励
     */
    private giveCompletionRewards(levelId: number, stars: number): void {
        // 基础金币奖励
        const baseCoins = levelId * 50;
        const starBonus = stars * 25;
        const totalCoins = baseCoins + starBonus;
        
        this.addCoins(totalCoins, `level_${levelId}_complete`);
        
        // 钻石奖励（3星才给）
        if (stars >= 3) {
            const diamonds = Math.max(1, Math.floor(levelId / 3));
            this.addDiamonds(diamonds, `level_${levelId}_perfect`);
        }
        
        // 特殊关卡额外奖励
        if (levelId % 10 === 0) {
            this.addGems(1, `level_${levelId}_milestone`);
        }
    }
    
    // === 统计数据更新 ===
    
    public updateStatistic(key: keyof GameStatistics, value: number): void {
        if (!this.playerData) return;
        
        if (typeof this.playerData.statistics[key] === 'number') {
            (this.playerData.statistics[key] as number) += value;
        }
    }
    
    // === 设置管理 ===
    
    public updateSetting<K extends keyof PlayerSettings>(key: K, value: PlayerSettings[K]): void {
        if (!this.playerData) return;
        
        this.playerData.settings[key] = value;
        this.savePlayerData();
    }
    
    public getSetting<K extends keyof PlayerSettings>(key: K): PlayerSettings[K] {
        return this.playerData?.settings[key];
    }
    
    // === 工具方法 ===
    
    /**
     * 生成唯一玩家ID
     */
    private generatePlayerId(): string {
        return `player_${Date.now()}_${Math.random().toString(36).substr(2, 9)}`;
    }
    
    /**
     * 重置所有数据
     */
    public resetAllData(): void {
        sys.localStorage.removeItem(this.SAVE_KEY);
        sys.localStorage.removeItem(this.BACKUP_KEY);
        this.createNewPlayerData();
    }
    
    /**
     * 导出存档数据（用于调试）
     */
    public exportSaveData(): string {
        return JSON.stringify(this.playerData, null, 2);
    }
    
    /**
     * 导入存档数据（用于调试）
     */
    public importSaveData(dataString: string): boolean {
        try {
            const data = JSON.parse(dataString);
            this.playerData = this.validateAndMigrateData(data);
            this.savePlayerData(true);
            return true;
        } catch (error) {
            console.error('❌ 存档数据导入失败:', error);
            return false;
        }
    }
    
    /**
     * 获取存档摘要信息
     */
    public getSaveSummary(): string {
        if (!this.playerData) return '无存档数据';
        
        return `玩家等级: ${this.playerData.playerLevel} | ` +
               `当前关卡: ${this.playerData.currentLevel} | ` +
               `最高关卡: ${this.playerData.maxUnlockedLevel} | ` +
               `金币: ${this.playerData.coins} | ` +
               `钻石: ${this.playerData.diamonds} | ` +
               `游戏次数: ${this.playerData.statistics.totalGamesPlayed}`;
    }
}