import type { AppRegistration } from './types/AppManifest'
import { reactive, markRaw } from 'vue'

/**
 * 应用注册中心
 * 管理所有内置应用的注册和获取
 */
export class AppRegistry {
  private static instance: AppRegistry | null = null
  private apps = reactive(new Map<string, AppRegistration>())

  private constructor() {}

  static getInstance(): AppRegistry {
    if (!AppRegistry.instance) {
      AppRegistry.instance = new AppRegistry()
    }
    return AppRegistry.instance
  }

  /**
   * 注册内置应用
   */
  registerApp(registration: AppRegistration): void {
    // 使用 markRaw 标记组件，避免被设为响应式
    // 注意：对于异步组件，我们不立即标记为raw，而是在实际加载时处理
    const safeRegistration = {
      ...registration,
      component: registration.component,
    }
    this.apps.set(registration.manifest.id, safeRegistration)
    console.log(`已注册内置应用: ${registration.manifest.name}`)
  }

  /**
   * 获取应用
   */
  getApp(appId: string): AppRegistration | undefined {
    return this.apps.get(appId)
  }

  /**
   * 获取所有应用
   */
  getAllApps(): AppRegistration[] {
    return Array.from(this.apps.values())
  }

  /**
   * 获取所有内置应用
   */
  getBuiltInApps(): AppRegistration[] {
    return Array.from(this.apps.values()).filter((app) => app.isBuiltIn)
  }

  /**
   * 检查应用是否存在
   */
  hasApp(appId: string): boolean {
    return this.apps.has(appId)
  }

  /**
   * 按类别获取应用
   */
  getAppsByCategory(category: string): AppRegistration[] {
    return Array.from(this.apps.values()).filter((app) => app.manifest.category === category)
  }

  /**
   * 搜索应用
   */
  searchApps(query: string): AppRegistration[] {
    const lowercaseQuery = query.toLowerCase()
    return Array.from(this.apps.values()).filter((app) => {
      const manifest = app.manifest
      return (
        manifest.name.toLowerCase().includes(lowercaseQuery) ||
        manifest.description.toLowerCase().includes(lowercaseQuery) ||
        manifest.keywords?.some((keyword) => keyword.toLowerCase().includes(lowercaseQuery))
      )
    })
  }

  /**
   * 清空所有应用
   */
  clear(): void {
    this.apps.clear()
  }
}

// 导出单例实例
export const appRegistry = AppRegistry.getInstance()