import { computed, watch } from 'vue'
import type { IDesktopAppIcon } from '@/ui/types/IDesktopAppIcon.ts'
import { appRegistry } from '@/apps'

/**
 * 动态应用图标管理
 * 合并内置应用和外置应用生成图标列表
 */
export function useDynamicAppIcons() {
  
  // 生成所有可用的应用图标
  const generateAppIcons = (): IDesktopAppIcon[] => {
    const icons: IDesktopAppIcon[] = []
    let position = 1
    
    // 添加内置应用
    const builtInApps = appRegistry.getAllApps()
    for (const app of builtInApps) {
      const x = ((position - 1) % 4) + 1 // 每行4个图标
      const y = Math.floor((position - 1) / 4) + 1
      
      icons.push({
        name: app.manifest.name,
        icon: app.manifest.icon,
        path: app.manifest.id,
        x,
        y
      })
      position++
    }
    
    // 添加外置应用
    // const externalApps = []
    // for (const app of externalApps) {
    //   const x = ((position - 1) % 4) + 1
    //   const y = Math.floor((position - 1) / 4) + 1
    //
    //   icons.push({
    //     name: app.manifest.name,
    //     icon: app.manifest.icon || '📱', // 默认图标
    //     path: app.manifest.id,
    //     x,
    //     y
    //   })
    //   position++
    // }
    
    // 添加系统状态应用
    icons.push({
      name: '系统状态',
      icon: '⚙️',
      path: 'system-status',
      x: ((position - 1) % 4) + 1,
      y: Math.floor((position - 1) / 4) + 1
    })
    
    return icons
  }
  
  // 计算应用图标（响应式）
  const appIcons = computed(() => {
    return generateAppIcons()
  })
  
  // 从本地存储加载位置信息
  const loadIconPositions = (): Record<string, { x: number, y: number }> => {
    try {
      const saved = localStorage.getItem('desktopAppIconPositions')
      return saved ? JSON.parse(saved) : {}
    } catch (error) {
      console.warn('加载图标位置信息失败:', error)
      return {}
    }
  }
  
  // 保存位置信息到本地存储
  const saveIconPositions = (icons: IDesktopAppIcon[]) => {
    try {
      const positions = icons.reduce((acc, icon) => {
        acc[icon.path] = { x: icon.x, y: icon.y }
        return acc
      }, {} as Record<string, { x: number, y: number }>)
      
      localStorage.setItem('desktopAppIconPositions', JSON.stringify(positions))
    } catch (error) {
      console.warn('保存图标位置信息失败:', error)
    }
  }
  
  // 应用保存的位置信息
  const applyIconPositions = (icons: IDesktopAppIcon[]): IDesktopAppIcon[] => {
    const savedPositions = loadIconPositions()
    
    return icons.map(icon => {
      const savedPos = savedPositions[icon.path]
      if (savedPos) {
        return { ...icon, x: savedPos.x, y: savedPos.y }
      }
      return icon
    })
  }
  
  // 获取带位置信息的应用图标
  const getAppIconsWithPositions = (): IDesktopAppIcon[] => {
    const icons = appIcons.value
    return applyIconPositions(icons)
  }
  
  // 刷新应用列表（仅在需要时手动调用）
  const refreshApps = async () => {
    try {
      // 只有在系统服务已启动的情况下才刷新
    } catch (error) {
      console.error('[DynamicAppIcons] 刷新应用列表失败:', error)
    }
  }
  
  return {
    appIcons,
    getAppIconsWithPositions,
    saveIconPositions,
    refreshApps
  }
}

// 获取应用ID映射
export function getAppIdFromIcon(iconInfo: IDesktopAppIcon): string {
  // 特殊处理系统应用
  if (iconInfo.path === 'system-status') {
    return 'system-status'
  }
  
  // 对于其他应用，path就是appId
  return iconInfo.path
}