import { reactive } from 'vue'
import type { ResourceService } from './ResourceService'
import type { ApplicationSandboxEngine } from './ApplicationSandboxEngine'
import { v4 as uuidv4 } from 'uuid'
import { externalAppDiscovery } from './ExternalAppDiscovery'
import type { WindowFormService } from '@/services/WindowFormService.ts'

/**
 * 应用状态枚举
 */
export enum AppLifecycleState {
  INSTALLING = 'installing',
  INSTALLED = 'installed',
  STARTING = 'starting',
  RUNNING = 'running',
  SUSPENDED = 'suspended',
  STOPPING = 'stopping',
  STOPPED = 'stopped',
  UNINSTALLING = 'uninstalling',
  ERROR = 'error',
  CRASHED = 'crashed',
  AVAILABLE = 'available' // 外置应用可用但未注册状态
}

/**
 * 应用清单文件接口
 */
export interface AppManifest {
  id: string
  name: string
  version: string
  description: string
  author: string
  homepage?: string
  icon: string
  entryPoint: string // 入口文件路径
  permissions: string[]
  minSystemVersion?: string
  dependencies?: Record<string, string>
  window?: {
    width: number
    height: number
    minWidth?: number
    minHeight?: number
    maxWidth?: number
    maxHeight?: number
    resizable?: boolean
    center?: boolean
  }
  background?: {
    persistent?: boolean
    scripts?: string[]
  }
  contentSecurity?: {
    policy?: string
    allowedDomains?: string[]
  }
}

/**
 * 应用实例接口
 */
export interface AppInstance {
  id: string
  manifest: AppManifest
  state: AppLifecycleState
  windowId?: string
  sandboxId?: string
  processId: string
  installedAt: Date
  startedAt?: Date
  lastActiveAt?: Date
  stoppedAt?: Date
  errorCount: number
  crashCount: number
  memoryUsage: number
  cpuUsage: number
  version: string
  autoStart: boolean
  persistent: boolean
}

/**
 * 应用启动选项
 */
export interface AppStartOptions {
  windowConfig?: {
    x?: number
    y?: number
    width?: number
    height?: number
    state?: 'normal' | 'minimized' | 'maximized'
  }
  args?: Record<string, any>
  background?: boolean
}

/**
 * 应用生命周期事件
 */
export interface AppLifecycleEvents {
  onInstalled: (appId: string, manifest: AppManifest) => void
  onUninstalled: (appId: string) => void
  onStarted: (appId: string, processId: string) => void
  onStopped: (appId: string, processId: string) => void
  onSuspended: (appId: string, processId: string) => void
  onResumed: (appId: string, processId: string) => void
  onError: (appId: string, error: Error) => void
  onCrashed: (appId: string, reason: string) => void
  onStateChanged: (appId: string, newState: AppLifecycleState, oldState: AppLifecycleState) => void
}

/**
 * 应用生命周期管理器
 */
export class ApplicationLifecycleManager {
  private installedApps = reactive(new Map<string, AppInstance>())
  private runningProcesses = reactive(new Map<string, AppInstance>())
  private appFiles = new Map<string, Map<string, Blob | string>>() // 应用文件存储

  private windowFormService: WindowFormService
  private resourceService: ResourceService
  private sandboxEngine: ApplicationSandboxEngine

  constructor(
    windowFormService: WindowFormService,
    resourceService: ResourceService,
    sandboxEngine: ApplicationSandboxEngine
  ) {
    this.windowFormService = windowFormService
    this.resourceService = resourceService
    this.sandboxEngine = sandboxEngine
  }

  /**
   * 启动应用
   */
  async startApp(appId: string, options: AppStartOptions = {}): Promise<string> {
    let app = this.installedApps.get(appId)

    console.log('-----------------------------')

    // 如果应用未安装，检查是否为外置应用
    let isExternalApp = false
    if (!app) {
      const externalApp = externalAppDiscovery.getApp(appId)
      if (externalApp) {
        console.log(`[LifecycleManager] 发现外置应用 ${appId}`)
        isExternalApp = true

        // 为外部应用创建临时实例
        const now = new Date()
        app = {
          id: externalApp.manifest.id,
          manifest: externalApp.manifest,
          state: AppLifecycleState.INSTALLED,
          processId: '',
          installedAt: now,
          errorCount: 0,
          crashCount: 0,
          memoryUsage: 0,
          cpuUsage: 0,
          version: externalApp.manifest.version,
          autoStart: false,
          persistent: false
        }
      }
    }

    if (!app) {
      throw new Error(`应用 ${appId} 未安装且未发现`)
    }

    if (app.state === AppLifecycleState.RUNNING) {
      throw new Error(`应用 ${appId} 已在运行`)
    }

    try {
      const processId = uuidv4()
      app.processId = processId

      this.updateAppState(app, AppLifecycleState.STARTING)

      // 检查是否为内置应用
      let isBuiltInApp = true

      // 创建窗体（如果不是后台应用）
      let windowId: string | undefined
      if (!options.background && !app.manifest.background?.scripts) {
        const windowConfig = {
          title: app.manifest.name,
          width: options.windowConfig?.width || app.manifest.window?.width || 800,
          height: options.windowConfig?.height || app.manifest.window?.height || 600,
          x: options.windowConfig?.x,
          y: options.windowConfig?.y,
          resizable: app.manifest.window?.resizable !== false,
          minWidth: app.manifest.window?.minWidth,
          minHeight: app.manifest.window?.minHeight,
          maxWidth: app.manifest.window?.maxWidth,
          maxHeight: app.manifest.window?.maxHeight
        }

        const windowInstance = await this.windowFormService.createWindow(appId, windowConfig)
        windowId = windowInstance.id
        app.windowId = windowId
      }

      // 对于外置应用，需要创建沙箱；内置应用跳过沙箱
      if (isExternalApp && !isBuiltInApp) {
        // 为外置应用创建沙箱
        const sandboxConfig = {
          securityLevel: 2, // HIGH
          allowScripts: true,
          allowSameOrigin: false, // 安全考虑：不允许同源访问以防止沙箱逃逸
          allowForms: true,
          networkTimeout: 15000, // 增加超时时间到15秒
          csp:
            app.manifest.contentSecurity?.policy ||
            "default-src 'self'; script-src 'self' 'unsafe-inline'; style-src 'self' 'unsafe-inline'; img-src 'self' data: blob:; connect-src 'self';"
        }

        const sandbox = await this.sandboxEngine.createSandbox(
          appId,
          windowId || 'background',
          sandboxConfig
        )
        app.sandboxId = sandbox.id

        // 为外置应用加载代码
        await this.loadExternalAppInSandbox(app, sandbox.id)
      } else if (isBuiltInApp) {
        console.log(`[LifecycleManager] 内置应用 ${appId} 跳过沙箱创建和代码加载`)
      } else {
        console.warn(`[LifecycleManager] 未知应用类型: ${appId}`)
      }

      // 更新状态
      const now = new Date()
      app.startedAt = now
      app.lastActiveAt = now
      this.updateAppState(app, AppLifecycleState.RUNNING)

      // 添加到运行进程列表
      this.runningProcesses.set(processId, app)

      // 注意：状态变更消息由updateAppState方法自动发送，不需要手动发送

      console.log(`应用 ${app.manifest.name} (${appId}) 启动成功，进程ID: ${processId}`)
      return processId
    } catch (error) {
      this.updateAppState(app, AppLifecycleState.ERROR)
      app.errorCount++

      console.error('应用启动失败:', error)
      throw error
    }
  }

  /**
   * 停止应用
   */
  async stopApp(appId: string): Promise<boolean> {
    // 首先从已安装应用中查找
    let app = this.installedApps.get(appId)

    // 如果未找到，从运行进程列表中查找（可能是外部应用的临时实例）
    if (!app) {
      for (const runningApp of this.runningProcesses.values()) {
        if (runningApp.id === appId) {
          app = runningApp
          break
        }
      }
    }

    if (!app) {
      throw new Error(`应用 ${appId} 未安装或未运行`)
    }

    if (app.state !== AppLifecycleState.RUNNING && app.state !== AppLifecycleState.SUSPENDED) {
      return true
    }

    try {
      this.updateAppState(app, AppLifecycleState.STOPPING)

      // 销毁沙箱
      if (app.sandboxId) {
        this.sandboxEngine.destroySandbox(app.sandboxId)
        app.sandboxId = undefined
      }

      // 关闭窗体（如果还存在）
      if (app.windowId) {
        const window = this.windowFormService.getWindow(app.windowId)
        if (window) {
          await this.windowFormService.destroyWindow(app.windowId)
        }
        app.windowId = undefined
      }

      // 更新状态
      app.stoppedAt = new Date()
      this.updateAppState(app, AppLifecycleState.STOPPED)

      // 从运行进程列表中移除
      if (app.processId) {
        this.runningProcesses.delete(app.processId)
        app.processId = ''
      }

      // 注意：状态变更消息由updateAppState方法自动发送，不需要手动发送

      console.log(`应用 ${appId} 停止成功`)
      return true
    } catch (error) {
      console.error('应用停止失败:', error)
      return false
    }
  }

  /**
   * 获取应用信息
   */
  getApp(appId: string): AppInstance | undefined {
    return this.installedApps.get(appId)
  }

  /**
   * 获取所有已安装应用
   */
  getAllApps(): AppInstance[] {
    return Array.from(this.installedApps.values())
  }

  /**
   * 获取正在运行的应用
   */
  getRunningApps(): AppInstance[] {
    return Array.from(this.runningProcesses.values())
  }

  /**
   * 检查应用是否正在运行
   */
  isAppRunning(appId: string): boolean {
    // 首先从已安装应用中查找
    let app = this.installedApps.get(appId)

    // 如果未找到，从运行进程列表中查找（可能是外部应用的临时实例）
    if (!app) {
      for (const runningApp of this.runningProcesses.values()) {
        if (runningApp.id === appId) {
          app = runningApp
          break
        }
      }
    }

    return app?.state === AppLifecycleState.RUNNING || app?.state === AppLifecycleState.SUSPENDED
  }

  /**
   * 获取应用统计信息
   */
  getAppStats(appId: string) {
    const app = this.installedApps.get(appId)
    if (!app) return null

    return {
      state: app.state,
      errorCount: app.errorCount,
      crashCount: app.crashCount,
      memoryUsage: app.memoryUsage,
      cpuUsage: app.cpuUsage,
      startedAt: app.startedAt,
      lastActiveAt: app.lastActiveAt,
      uptime: app.startedAt ? Date.now() - app.startedAt.getTime() : 0
    }
  }

  /**
   * 检查权限
   */
  private async checkPermissions(permissions: string[]): Promise<void> {
    for (const permission of permissions) {
      // 这里可以添加权限检查逻辑
      // 目前简单允许所有权限
      console.log(`检查权限: ${permission}`)
    }
  }

  /**
   * 为外置应用加载代码到沙箱
   */
  private async loadExternalAppInSandbox(app: AppInstance, sandboxId: string): Promise<void> {
    try {
      const externalApp = externalAppDiscovery.getApp(app.id)
      if (!externalApp) {
        throw new Error('外置应用信息未找到')
      }

      // 直接使用外置应用的入口URL
      const entryUrl = externalApp.entryPath

      console.log(`[LifecycleManager] 加载外置应用: ${app.id} from ${entryUrl}`)

      // 在沙箱中加载应用
      await this.sandboxEngine.loadApplication(sandboxId, entryUrl)
    } catch (error) {
      console.error(`[LifecycleManager] 加载外置应用到沙箱失败:`, error)
      throw error
    }
  }

  /**
   * 获取所有可用应用（包括内置和外置）
   */
  getAllAvailableApps(): (AppInstance & { isExternal?: boolean })[] {
    const apps: (AppInstance & { isExternal?: boolean })[] = []

    // 添加已安装的应用
    for (const app of this.installedApps.values()) {
      apps.push(app)
    }

    // 添加未注册的外置应用
    for (const externalApp of externalAppDiscovery.getDiscoveredApps()) {
      if (!this.installedApps.has(externalApp.id)) {
        const appInstance: AppInstance & { isExternal: boolean } = {
          id: externalApp.manifest.id,
          manifest: externalApp.manifest,
          state: AppLifecycleState.AVAILABLE,
          processId: '',
          installedAt: externalApp.lastScanned,
          errorCount: 0,
          crashCount: 0,
          memoryUsage: 0,
          cpuUsage: 0,
          version: externalApp.manifest.version,
          autoStart: false,
          persistent: false,
          isExternal: true
        }
        apps.push(appInstance)
      }
    }

    return apps
  }

  /**
   * 刷新外置应用列表
   */
  async refreshExternalApps(): Promise<void> {
    try {
      await externalAppDiscovery.refresh()
      console.log('[LifecycleManager] 外置应用列表已刷新')
    } catch (error) {
      console.error('[LifecycleManager] 刷新外置应用列表失败:', error)
    }
  }

  /**
   * 处理应用错误
   */
  private handleAppError(appId: string, error: Error): void {
    const app = this.installedApps.get(appId)
    if (!app) return

    app.errorCount++

    console.error(`应用 ${appId} 发生错误:`, error)
  }

  /**
   * 处理应用崩溃
   */
  private handleAppCrash(appId: string, reason: string): void {
    const app = this.installedApps.get(appId)
    if (!app) return

    app.crashCount++
    this.updateAppState(app, AppLifecycleState.CRASHED)

    // 清理资源
    if (app.processId) {
      this.runningProcesses.delete(app.processId)
    }

    // 注意：状态变更消息由updateAppState方法自动发送，不需要手动发送

    console.error(`应用 ${appId} 崩溃: ${reason}`)
  }

  /**
   * 更新应用状态
   */
  private updateAppState(app: AppInstance, newState: AppLifecycleState): void {
    const oldState = app.state
    app.state = newState

    // 移除事件服务消息发送
    // this.eventService.sendMessage('system', 'app-lifecycle', {
    //   type: 'stateChanged',
    //   appId: app.id,
    //   newState,
    //   oldState
    // })
  }
}