import formProvider from '@ohos.app.form.formProvider';
import formBindingData from '@ohos.app.form.formBindingData';
import preferences from '@ohos.data.preferences';
import { hilog } from '@kit.PerformanceAnalysisKit';
import { WidgetData, WidgetSize, WidgetTheme, FormattedWidgetData, PreferencesData, CacheStats } from './WidgetTypes';

const TAG = 'WidgetDataManager';
const WIDGET_PREFERENCES_NAME = 'widget_data_prefs';
const CACHE_EXPIRY_TIME = 30 * 1000; // 30秒缓存过期时间

/**
 * 缓存项接口
 */
interface CacheItem {
  data: WidgetData;
  timestamp: number;
  expiry: number;
}

/**
 * 卡片数据管理器
 * 负责卡片数据的持久化存储、缓存和更新
 */
export class WidgetDataManager {
  private preferencesStore: preferences.Preferences | null = null;
  private dataCache: Map<string, CacheItem> = new Map();
  private lastUpdateTime: number = 0;
  private context: object | null = null;

  constructor(context?: object) {
    this.context = context || null;
    this.initPreferences();
    this.startCacheCleanup();
  }

  /**
   * 初始化数据存储
   */
  private async initPreferences(): Promise<void> {
    try {
      if (this.context) {
        const store = await preferences.getPreferences(this.context as Context, WIDGET_PREFERENCES_NAME);
        this.preferencesStore = store;
        hilog.info(0x0000, TAG, 'Preferences initialized successfully with context');
      } else {
        hilog.warn(0x0000, TAG, 'No context provided, preferences initialization skipped');
      }
    } catch (error) {
      hilog.error(0x0000, TAG, `Failed to initialize preferences: ${error}`);
    }
  }

  /**
   * 获取初始卡片数据
   */
  getInitialWidgetData(): WidgetData {
    const initialData: WidgetData = {
      playState: {
        isPlaying: false,
        isPaused: true,
        isLoading: false
      },
      currentSong: {
        id: '',
        title: '暂无播放',
        artist: '未知艺术家',
        album: '未知专辑',
        coverImagePath: '',
        duration: 0
      },
      progress: {
        currentPosition: 0,
        duration: 0,
        percentage: 0,
        currentTimeText: '00:00',
        totalTimeText: '00:00'
      },
      playlist: {
        hasNext: false,
        hasPrevious: false,
        currentIndex: 0,
        totalCount: 0
      },
      config: {
        size: WidgetSize.MEDIUM,
        theme: WidgetTheme.AUTO,
        showProgress: true,
        showCover: true
      }
    };
    return initialData;
  }

  /**
   * 保存卡片数据
   */
  async saveWidgetData(formId: string, data: WidgetData | FormattedWidgetData): Promise<void> {
    try {
      if (!this.preferencesStore) {
        await this.initPreferences();
      }
      
      const dataKey = `widget_${formId}`;
      await this.preferencesStore?.put(dataKey, JSON.stringify(data));
      await this.preferencesStore?.flush();
      
      hilog.info(0x0000, TAG, `Widget data saved for form: ${formId}`);
    } catch (error) {
      hilog.error(0x0000, TAG, `Failed to save widget data: ${error}`);
    }
  }

  /**
   * 获取卡片数据
   */
  async getWidgetData(formId: string): Promise<WidgetData> {
    try {
      if (!this.preferencesStore) {
        await this.initPreferences();
      }
      
      const dataKey = `widget_${formId}`;
      const dataStr = await this.preferencesStore?.get(dataKey, '') as string;
      
      if (dataStr) {
        return JSON.parse(dataStr) as WidgetData;
      } else {
        return this.getInitialWidgetData() as WidgetData;
      }
    } catch (error) {
      hilog.error(0x0000, TAG, `Failed to get widget data: ${error}`);
      return this.getInitialWidgetData() as WidgetData;
    }
  }

  /**
   * 更新卡片显示
   */
  async updateWidget(formId: string, data: WidgetData | FormattedWidgetData): Promise<void> {
    try {
      hilog.info(0x0000, TAG, `Updating widget ${formId} with data type check`);
      
      let formattedData: FormattedWidgetData;
      
      // 检查数据类型，如果已经是格式化数据则直接使用
      if (this.isFormattedWidgetData(data)) {
        hilog.info(0x0000, TAG, `Data is already formatted for widget ${formId}`);
        formattedData = data as FormattedWidgetData;
        
        // 如果是格式化数据，需要转换回WidgetData进行存储
        const widgetData = this.convertToWidgetData(formattedData);
        await this.saveWidgetData(formId, widgetData);
      } else {
        hilog.info(0x0000, TAG, `Formatting raw data for widget ${formId}`);
        // 保存原始数据到本地存储
        await this.saveWidgetData(formId, data as WidgetData);
        
        // 格式化数据用于卡片显示
        formattedData = this.formatDataForWidget(data as WidgetData);
      }
      
      hilog.info(0x0000, TAG, `Final formatted data for ${formId}: isPlaying=${formattedData.isPlaying}, hasNext=${formattedData.hasNext}, hasPrevious=${formattedData.hasPrevious}, title=${formattedData.songTitle}, coverImage=${formattedData.coverImage ? 'present' : 'empty'}, showCover=${formattedData.showCover}`);
      
      // 创建卡片绑定数据
      const formData = formBindingData.createFormBindingData(formattedData);
      
      // 更新卡片
      await formProvider.updateForm(formId, formData);
      
      hilog.info(0x0000, TAG, `Widget updated successfully: ${formId}`);
    } catch (error) {
      hilog.error(0x0000, TAG, `Failed to update widget: ${error}`);
    }
  }

  /**
   * 批量更新所有卡片
   */
  async updateAllWidgets(data?: WidgetData): Promise<void> {
    try {
      if (!this.preferencesStore) {
        await this.initPreferences();
      }
      
      // 获取所有卡片ID
      const allKeys = await this.preferencesStore?.getAll();
      const emptyPrefs: PreferencesData = {};
      const widgetKeys = Object.keys(allKeys || emptyPrefs).filter(key => key.startsWith('widget_'));
      
      for (const key of widgetKeys) {
        const formId: string = key.replace('widget_', '');
        const widgetData: WidgetData = data || await this.getWidgetData(formId);
        await this.updateWidget(formId, widgetData);
      }
      
      hilog.info(0x0000, TAG, `Updated ${widgetKeys.length} widgets`);
    } catch (error) {
      hilog.error(0x0000, TAG, `Failed to update all widgets: ${error}`);
    }
  }

  /**
   * 删除卡片数据
   */
  async removeWidgetData(formId: string): Promise<void> {
    try {
      if (!this.preferencesStore) {
        await this.initPreferences();
      }
      
      const dataKey = `widget_${formId}`;
      await this.preferencesStore?.delete(dataKey);
      await this.preferencesStore?.flush();
      
      hilog.info(0x0000, TAG, `Widget data removed for form: ${formId}`);
    } catch (error) {
      hilog.error(0x0000, TAG, `Failed to remove widget data: ${error}`);
    }
  }

  /**
   * 格式化数据用于卡片显示
   */
  public formatDataForWidget(data: WidgetData): FormattedWidgetData {
    hilog.info(0x0000, TAG, `Formatting data for widget: hasNext=${data.playlist.hasNext}, hasPrevious=${data.playlist.hasPrevious}, currentIndex=${data.playlist.currentIndex}, totalCount=${data.playlist.totalCount}`);
    
    // 修复按钮状态：基于当前索引和总数重新计算正确的按钮状态
    let hasNext = data.playlist.hasNext;
    let hasPrevious = data.playlist.hasPrevious;
    
    hilog.info(0x0000, TAG, `Original button states: hasNext=${hasNext}, hasPrevious=${hasPrevious}, currentIndex=${data.playlist.currentIndex}, totalCount=${data.playlist.totalCount}`);
    
    // 如果有播放列表，重新计算按钮状态
    if (data.playlist.totalCount > 1) {
      const correctHasNext = data.playlist.currentIndex < data.playlist.totalCount - 1;
      const correctHasPrevious = data.playlist.currentIndex > 0;
      
      // 如果计算出的状态与当前状态不一致，进行修复
      if (hasNext !== correctHasNext || hasPrevious !== correctHasPrevious) {
        hasNext = correctHasNext;
        hasPrevious = correctHasPrevious;
        hilog.info(0x0000, TAG, `Fixed button states: hasNext=${hasNext}, hasPrevious=${hasPrevious}, currentIndex=${data.playlist.currentIndex}, totalCount=${data.playlist.totalCount}`);
      } else {
        hilog.info(0x0000, TAG, `Button states are correct: hasNext=${hasNext}, hasPrevious=${hasPrevious}`);
      }
    } else if (data.playlist.totalCount <= 1) {
      // 如果只有一首歌或没有歌，按钮都应该禁用
      hasNext = false;
      hasPrevious = false;
      hilog.info(0x0000, TAG, `Single or no song, buttons disabled: totalCount=${data.playlist.totalCount}`);
    }
    
    const formattedData: FormattedWidgetData = {
      // 播放状态
      isPlaying: data.playState.isPlaying,
      isPaused: data.playState.isPaused,
      isLoading: data.playState.isLoading,
      
      // 歌曲信息
      songTitle: this.truncateText(data.currentSong.title, 20),
      songArtist: this.truncateText(data.currentSong.artist, 15),
      songAlbum: this.truncateText(data.currentSong.album, 15),
      coverImage: data.currentSong.coverImagePath && data.currentSong.coverImagePath.trim() !== '' ? data.currentSong.coverImagePath : '',
      
      // 播放进度
      currentTime: data.progress.currentTimeText,
      totalTime: data.progress.totalTimeText,
      progressPercentage: data.progress.percentage,
      
      // 控制按钮状态（使用修复后的值）
      hasNext: hasNext,
      hasPrevious: hasPrevious,
      
      // 卡片配置
      showProgress: data.config.showProgress,
      showCover: data.config.showCover,
      widgetSize: data.config.size as string,
      
      // 时间戳用于强制更新
      timestamp: Date.now()
    };
    
    hilog.info(0x0000, TAG, `Formatted widget data: isPlaying=${formattedData.isPlaying}, hasNext=${formattedData.hasNext}, hasPrevious=${formattedData.hasPrevious}, title=${formattedData.songTitle}`);
    return formattedData;
  }

  /**
   * 截断文本
   */
  private truncateText(text: string, maxLength: number): string {
    if (text.length <= maxLength) {
      return text;
    }
    return text.substring(0, maxLength - 1) + '…';
  }

  /**
   * 启动缓存清理定时器
   */
  private startCacheCleanup(): void {
    setInterval(() => {
      this.cleanExpiredCache();
    }, 60 * 1000); // 每分钟清理一次过期缓存
  }

  /**
   * 清理过期缓存
   */
  private cleanExpiredCache(): void {
    const now = Date.now();
    const expiredKeys: string[] = [];
    
    this.dataCache.forEach((item: CacheItem, key: string) => {
      if (now > item.expiry) {
        expiredKeys.push(key);
      }
    });
    
    expiredKeys.forEach((key: string) => {
      this.dataCache.delete(key);
    });
    
    if (expiredKeys.length > 0) {
      hilog.info(0x0000, TAG, `Cleaned ${expiredKeys.length} expired cache items`);
    }
  }

  /**
   * 从缓存获取数据
   */
  private getCachedData(formId: string): WidgetData | null {
    const cacheKey = `cache_${formId}`;
    const cacheItem = this.dataCache.get(cacheKey);
    
    if (cacheItem && Date.now() < cacheItem.expiry) {
      hilog.info(0x0000, TAG, `Cache hit for form: ${formId}`);
      return cacheItem.data;
    }
    
    if (cacheItem) {
      // 缓存已过期，删除
      this.dataCache.delete(cacheKey);
      hilog.info(0x0000, TAG, `Cache expired for form: ${formId}`);
    }
    
    return null;
  }

  /**
   * 设置缓存数据
   */
  private setCachedData(formId: string, data: WidgetData): void {
    const cacheKey = `cache_${formId}`;
    const now = Date.now();
    
    const cacheItem: CacheItem = {
      data: data,
      timestamp: now,
      expiry: now + CACHE_EXPIRY_TIME
    };
    
    this.dataCache.set(cacheKey, cacheItem);
    hilog.info(0x0000, TAG, `Data cached for form: ${formId}`);
  }

  /**
   * 获取卡片数据（带缓存）
   */
  async getWidgetDataWithCache(formId: string): Promise<WidgetData> {
    // 先尝试从缓存获取
    const cachedData = this.getCachedData(formId);
    if (cachedData) {
      return cachedData;
    }
    
    // 缓存未命中，从持久化存储获取
    const data = await this.getWidgetData(formId);
    
    // 设置缓存
    this.setCachedData(formId, data);
    
    return data;
  }

  /**
   * 更新卡片数据（带缓存）
   */
  async updateWidgetWithCache(formId: string, data: WidgetData): Promise<void> {
    // 更新缓存
    this.setCachedData(formId, data);
    
    // 更新卡片显示
    await this.updateWidget(formId, data);
  }

  /**
   * 清除指定卡片的缓存
   */
  clearWidgetCache(formId: string): void {
    const cacheKey = `cache_${formId}`;
    if (this.dataCache.has(cacheKey)) {
      this.dataCache.delete(cacheKey);
      hilog.info(0x0000, TAG, `Cache cleared for form: ${formId}`);
    }
  }

  /**
   * 清除所有缓存
   */
  clearAllCache(): void {
    const cacheSize = this.dataCache.size;
    this.dataCache.clear();
    hilog.info(0x0000, TAG, `All cache cleared, ${cacheSize} items removed`);
  }

  /**
   * 获取缓存统计信息
   */
  getCacheStats(): CacheStats {
    const stats: CacheStats = {
      size: this.dataCache.size,
      hitRate: 0, // 可以在实际使用中统计命中率
      lastUpdate: this.lastUpdateTime
    };
    return stats;
  }

  /**
   * 预热缓存
   */
  async preloadCache(): Promise<void> {
    try {
      if (!this.preferencesStore) {
        await this.initPreferences();
      }
      
      const allKeys = await this.preferencesStore?.getAll();
      const emptyPrefs: PreferencesData = {};
      const widgetKeys = Object.keys(allKeys || emptyPrefs).filter(key => key.startsWith('widget_'));
      
      for (const key of widgetKeys) {
        const formId: string = key.replace('widget_', '');
        const data: WidgetData = await this.getWidgetData(formId);
        this.setCachedData(formId, data);
      }
      
      hilog.info(0x0000, TAG, `Cache preloaded for ${widgetKeys.length} widgets`);
    } catch (error) {
      hilog.error(0x0000, TAG, `Failed to preload cache: ${error}`);
    }
  }

  /**
   * 检查是否为格式化的卡片数据
   */
  private isFormattedWidgetData(data: WidgetData | FormattedWidgetData): boolean {
    // FormattedWidgetData有timestamp字段，而WidgetData没有
    return (data as FormattedWidgetData).timestamp !== undefined && typeof (data as FormattedWidgetData).timestamp === 'number';
  }

  /**
   * 将格式化数据转换为WidgetData
   */
  private convertToWidgetData(formattedData: FormattedWidgetData): WidgetData {
    const widgetData: WidgetData = {
      playState: {
        isPlaying: formattedData.isPlaying,
        isPaused: formattedData.isPaused,
        isLoading: formattedData.isLoading
      },
      currentSong: {
        id: '', // FormattedWidgetData中没有id，使用空字符串
        title: formattedData.songTitle,
        artist: formattedData.songArtist,
        album: formattedData.songAlbum,
        coverImagePath: formattedData.coverImage,
        duration: 0 // FormattedWidgetData中没有duration，使用0
      },
      progress: {
        currentPosition: 0, // 需要从时间文本反推，这里简化处理
        duration: 0,
        percentage: formattedData.progressPercentage,
        currentTimeText: formattedData.currentTime,
        totalTimeText: formattedData.totalTime
      },
      playlist: {
        hasNext: formattedData.hasNext,
        hasPrevious: formattedData.hasPrevious,
        currentIndex: 0,
        totalCount: 0
      },
      config: {
        size: this.parseWidgetSize(formattedData.widgetSize),
        theme: WidgetTheme.AUTO,
        showProgress: formattedData.showProgress,
        showCover: formattedData.showCover
      }
    };
    return widgetData;
  }

  /**
   * 解析卡片尺寸字符串
   */
  private parseWidgetSize(sizeStr: string): WidgetSize {
    switch (sizeStr.toLowerCase()) {
      case 'small':
        return WidgetSize.SMALL;
      case 'large':
        return WidgetSize.LARGE;
      case 'medium':
      default:
        return WidgetSize.MEDIUM;
    }
  }
}