/**
 * 屏幕尺寸缓存模块
 * 缓存屏幕宽度和高度，避免重复调用系统API
 */

class ScreenCache {
  constructor() {
    this.cache = {
      windowWidth: 0,
      windowHeight: 0,
      screenWidth: 0,
      screenHeight: 0,
      statusBarHeight: 0,
      pixelRatio: 1,
      timestamp: 0
    }
    this.initialized = false
  }

  /**
   * 初始化屏幕尺寸缓存
   */
  init() {
    if (this.initialized) {
      return this.cache
    }

    try {
      const systemInfo = uni.getSystemInfoSync()
      
      this.cache = {
        windowWidth: systemInfo.windowWidth || 375,
        windowHeight: systemInfo.windowHeight || 667,
        screenWidth: systemInfo.screenWidth || 375,
        screenHeight: systemInfo.screenHeight || 667,
        statusBarHeight: systemInfo.statusBarHeight || 0,
        pixelRatio: systemInfo.pixelRatio || 1,
        timestamp: Date.now()
      }
      
      this.initialized = true
      console.log('[屏幕缓存] 初始化完成:', this.cache)
      
    } catch (error) {
      console.error('[屏幕缓存] 初始化失败:', error)
      // 使用默认值
      this.cache = {
        windowWidth: 375,
        windowHeight: 667,
        screenWidth: 375,
        screenHeight: 667,
        statusBarHeight: 0,
        pixelRatio: 1,
        timestamp: Date.now()
      }
    }

    return this.cache
  }

  /**
   * 获取窗口宽度
   * @returns {number} 窗口宽度（px）
   */
  getWindowWidth() {
    if (!this.initialized) {
      this.init()
    }
    return this.cache.windowWidth
  }

  /**
   * 获取窗口高度
   * @returns {number} 窗口高度（px）
   */
  getWindowHeight() {
    if (!this.initialized) {
      this.init()
    }
    return this.cache.windowHeight
  }

  /**
   * 获取屏幕宽度
   * @returns {number} 屏幕宽度（px）
   */
  getScreenWidth() {
    if (!this.initialized) {
      this.init()
    }
    return this.cache.screenWidth
  }

  /**
   * 获取屏幕高度
   * @returns {number} 屏幕高度（px）
   */
  getScreenHeight() {
    if (!this.initialized) {
      this.init()
    }
    return this.cache.screenHeight
  }

  /**
   * 获取状态栏高度
   * @returns {number} 状态栏高度（px）
   */
  getStatusBarHeight() {
    if (!this.initialized) {
      this.init()
    }
    return this.cache.statusBarHeight
  }

  /**
   * 获取像素比
   * @returns {number} 像素比
   */
  getPixelRatio() {
    if (!this.initialized) {
      this.init()
    }
    return this.cache.pixelRatio
  }

  /**
   * 获取所有缓存数据
   * @returns {Object} 缓存数据对象
   */
  getAll() {
    if (!this.initialized) {
      this.init()
    }
    return { ...this.cache }
  }

  /**
   * 刷新缓存（屏幕方向改变时调用）
   */
  refresh() {
    this.initialized = false
    return this.init()
  }

  /**
   * 清除缓存
   */
  clear() {
    this.cache = {
      windowWidth: 0,
      windowHeight: 0,
      screenWidth: 0,
      screenHeight: 0,
      statusBarHeight: 0,
      pixelRatio: 1,
      timestamp: 0
    }
    this.initialized = false
    console.log('[屏幕缓存] 已清除')
  }
}

// 创建单例实例
const screenCache = new ScreenCache()

// 导出单例实例和便捷方法
export default screenCache

export const getWindowWidth = () => screenCache.getWindowWidth()
export const getWindowHeight = () => screenCache.getWindowHeight()
export const getScreenWidth = () => screenCache.getScreenWidth()
export const getScreenHeight = () => screenCache.getScreenHeight()
export const getStatusBarHeight = () => screenCache.getStatusBarHeight()
export const getPixelRatio = () => screenCache.getPixelRatio()
export const refreshScreenCache = () => screenCache.refresh()
export const clearScreenCache = () => screenCache.clear()