import { RouteRecordRaw, RouteLocationNormalized } from 'vue-router';
import { getDeviceType, DeviceType } from './deviceUtils';

/**
 * 路由适配器接口
 */
export interface RouteAdapter {
  original: () => Promise<any>; // web桌面端
  mobile?: () => Promise<any>;  // h5移动端
}

/**
 * 移动端路由映射表
 */
export const MOBILE_ROUTES_MAP: Record<string, string> = {
  // User Views
  '/home': '@/views/user/home/HomeView.mobile.vue',
  '/resource-center': '@/views/user/resource-center/ResourceCenterView.mobile.vue',
  '/resource-hot': '@/views/user/resource-center/HotResourceView.mobile.vue',
  '/search': '@/views/user/resource-center/SearchView.mobile.vue',
  '/course-center': '@/views/user/study-plan/CourseCenterView.mobile.vue',
  '/course-detail': '@/views/user/study-plan/CourseDetailView.mobile.vue',
  '/course-study': '@/views/user/study-plan/CourseStudyView.mobile.vue',
  '/study-tasks': '@/views/user/study-plan/StudyTasksView.mobile.vue',
  '/learning-task-detail': '@/views/user/study-plan/LearningTaskDetailView.mobile.vue',
  '/user-center': '@/views/user/user-center/UserCenterLayout.mobile.vue',
  '/personal-info': '@/views/user/user-center/profile/PersonalInfoView.mobile.vue',
  '/account-settings': '@/views/user/user-center/profile/AccountSettingsView.mobile.vue',
  '/my-achievements': '@/views/user/user-center/MyAchievementsView.mobile.vue',
  '/my-favorites': '@/views/user/user-center/MyFavoritesView.mobile.vue',
  '/learning-records': '@/views/user/user-center/LearningRecordsView.mobile.vue',
  '/my-messages': '@/views/user/message/MyMessageListView.mobile.vue',
  '/message-detail': '@/views/user/message/MyMessageDetailView.mobile.vue',
  
  // Public Views  
  '/login': '@/views/public/login/Login.mobile.vue',
  '/register': '@/views/public/login/Register.mobile.vue',
  '/forgot-password': '@/views/public/login/ForgotPassword.mobile.vue',
  '/article-show': '@/views/public/article/ArticleShowView.mobile.vue',
  '/article-add': '@/views/public/article/ArticleAddView.mobile.vue'
};

/**
 * Layout映射表
 */
export const LAYOUT_MAP: Record<string, Record<DeviceType, string>> = {
  'NavigationLayout': {
    [DeviceType.MOBILE]: '@/layouts/MobileLayout.vue',  // h5移动端
    [DeviceType.DESKTOP]: '@/layouts/NavigationLayout.vue' // web桌面端
  },
  'SidebarLayout': {
    [DeviceType.MOBILE]: '@/layouts/MobileLayout.vue',  // h5移动端
    [DeviceType.DESKTOP]: '@/layouts/SidebarLayout.vue' // web桌面端
  },
  'BasicLayout': {
    [DeviceType.MOBILE]: '@/layouts/MobileLayout.vue',  // h5移动端
    [DeviceType.DESKTOP]: '@/layouts/BasicLayout.vue'   // web桌面端
  },
  'BlankLayout': {
    [DeviceType.MOBILE]: '@/layouts/BlankLayout.vue',   // h5移动端
    [DeviceType.DESKTOP]: '@/layouts/BlankLayout.vue'   // web桌面端
  },
  'PageLayout': {
    [DeviceType.MOBILE]: '@/layouts/MobileLayout.vue',  // h5移动端
    [DeviceType.DESKTOP]: '@/layouts/PageLayout.vue'    // web桌面端
  }
};

/**
 * 创建响应式路由组件
 */
export function createResponsiveRoute(adapter: RouteAdapter): () => Promise<any> {
  return async () => {
    const deviceType = getDeviceType();
    
    try {
      // 尝试加载设备特定的组件
      if (deviceType === DeviceType.MOBILE && adapter.mobile) {
        return await adapter.mobile();
      }
    } catch (error) {
      console.warn(`Failed to load device-specific component for ${deviceType}, falling back to original:`, error);
    }
    
    // 回退到原始组件(桌面端/web)
    return await adapter.original();
  };
}

/**
 * 获取响应式Layout组件
 */
export function getResponsiveLayout(layoutName: string): () => Promise<any> {
  const deviceType = getDeviceType();
  const layoutMap = LAYOUT_MAP[layoutName];
  
  if (!layoutMap) {
    console.warn(`Unknown layout: ${layoutName}, using original`);
    // 使用具体的导入路径
    switch (layoutName) {
      case 'BlankLayout':
        return () => import('@/layouts/BlankLayout.vue');
      case 'NavigationLayout':
        return () => import('@/layouts/NavigationLayout.vue');
      case 'SidebarLayout':
        return () => import('@/layouts/SidebarLayout.vue');
      case 'BasicLayout':
        return () => import('@/layouts/BasicLayout.vue');
      case 'PageLayout':
        return () => import('@/layouts/PageLayout.vue');
      default:
        throw new Error(`Unknown layout: ${layoutName}`);
    }
  }
  
  const targetLayout = layoutMap[deviceType];
  
  return async () => {
    try {
      // 使用具体的导入路径而不是动态路径
      switch (targetLayout) {
        case '@/layouts/BlankLayout.vue':
          return await import('@/layouts/BlankLayout.vue');
        case '@/layouts/NavigationLayout.vue':
          return await import('@/layouts/NavigationLayout.vue');
        case '@/layouts/SidebarLayout.vue':
          return await import('@/layouts/SidebarLayout.vue');
        case '@/layouts/BasicLayout.vue':
          return await import('@/layouts/BasicLayout.vue');
        case '@/layouts/MobileLayout.vue':
          return await import('@/layouts/MobileLayout.vue');
        case '@/layouts/PageLayout.vue':
          return await import('@/layouts/PageLayout.vue');
        default:
          throw new Error(`Unknown layout path: ${targetLayout}`);
      }
    } catch (error) {
      console.warn(`Failed to load responsive layout ${targetLayout}, falling back to original:`, error);
      // 回退到原始layout
      switch (layoutName) {
        case 'BlankLayout':
          return await import('@/layouts/BlankLayout.vue');
        case 'NavigationLayout':
          return await import('@/layouts/NavigationLayout.vue');
        case 'SidebarLayout':
          return await import('@/layouts/SidebarLayout.vue');
        case 'BasicLayout':
          return await import('@/layouts/BasicLayout.vue');
        case 'PageLayout':
          return await import('@/layouts/PageLayout.vue');
        default:
          throw new Error(`Unknown layout: ${layoutName}`);
      }
    }
  };
}

/**
 * 创建自适应路由配置
 */
export function createAdaptiveRoute(
  path: string,
  originalComponent: string,
  layoutName?: string,
  meta?: any
): RouteRecordRaw {
  // 创建具体的导入函数而不是使用动态路径
  const getOriginalComponent = () => {
    switch (originalComponent) {
      case '@/views/public/login/Login.vue':
        return import('@/views/public/login/Login.vue');
      case '@/views/public/login/Register.vue':
        return import('@/views/public/login/Register.vue');
      case '@/views/public/login/ForgotPassword.vue':
        return import('@/views/public/login/ForgotPassword.vue');
      default:
        throw new Error(`Unknown component: ${originalComponent}`);
    }
  };
  
  const getMobileComponent = (): (() => Promise<any>) | null => {
    const mobilePath = MOBILE_ROUTES_MAP[path];
    if (!mobilePath) return null;
    
    switch (mobilePath) {
      case '@/views/public/login/Login.mobile.vue':
        return () => import('@/views/public/login/Login.mobile.vue');
      case '@/views/public/login/Register.mobile.vue':
        return () => import('@/views/public/login/Register.mobile.vue');
      case '@/views/public/login/ForgotPassword.mobile.vue':
        return () => import('@/views/public/login/ForgotPassword.mobile.vue');
      default:
        return null;
    }
  };

  const adapter: RouteAdapter = {
    original: getOriginalComponent
  };
  
  // 检查是否有移动端版本
  const mobileImportFunction = getMobileComponent();
  if (mobileImportFunction) {
    adapter.mobile = mobileImportFunction;
  }
  
  // 如果指定了Layout，应用响应式Layout
  if (layoutName) {
    const route: RouteRecordRaw = {
      path,
      component: getResponsiveLayout(layoutName),
      children: [
        {
          path: '',
          component: createResponsiveRoute(adapter),
          meta
        }
      ],
      meta
    };
    return route;
  }
  
  const route: RouteRecordRaw = {
    path,
    component: createResponsiveRoute(adapter),
    meta
  };
  
  return route;
}

/**
 * 监听屏幕尺寸变化，重新加载路由
 */
export function setupRouteWatcher(router: any) {
  let currentDeviceType = getDeviceType();
  
  const handleResize = () => {
    const newDeviceType = getDeviceType();
    if (newDeviceType !== currentDeviceType) {
      currentDeviceType = newDeviceType;
      // 重新加载当前路由以应用新的组件
      const currentRoute = router.currentRoute.value;
      router.replace({
        ...currentRoute,
        query: { 
          ...currentRoute.query, 
          _refresh: Date.now() // 强制重新加载
        }
      });
    }
  };
  
  window.addEventListener('resize', handleResize);
  
  // 返回清理函数
  return () => {
    window.removeEventListener('resize', handleResize);
  };
}