import type { RouteRecordNormalized } from 'vue-router';

import { useRouter } from 'vue-router';

import { isHttpUrl, openRouteInNewWindow, openWindow } from '@easyflow/utils';

function useNavigation() {
  const router = useRouter();
  const routeMetaMap = new Map<string, RouteRecordNormalized>();
  const prefetchedPaths = new Set<string>();
  const prefetchingPaths = new Set<string>();

  // 初始化路由映射
  const initRouteMetaMap = () => {
    const routes = router.getRoutes();
    routes.forEach((route) => {
      routeMetaMap.set(route.path, route);
    });
  };

  initRouteMetaMap();

  // 监听路由变化
  router.afterEach(() => {
    initRouteMetaMap();
  });

  // 检查是否应该在新窗口打开
  const shouldOpenInNewWindow = (path: string): boolean => {
    if (isHttpUrl(path)) {
      return true;
    }
    const route = routeMetaMap.get(path);
    // 如果有外链或者设置了在新窗口打开，返回 true
    return !!(route?.meta?.link || route?.meta?.openInNewWindow);
  };

  const resolveHref = (path: string): string => {
    return router.resolve(path).href;
  };

  const prefetch = (path: string) => {
    if (
      isHttpUrl(path) ||
      prefetchedPaths.has(path) ||
      prefetchingPaths.has(path)
    ) {
      return;
    }
    const { matched } = router.resolve(path);
    if (matched.length === 0) {
      return;
    }

    const componentLoadTasks: Array<Promise<unknown>> = [];
    matched.forEach((route) => {
      const component = route.components?.default;
      if (typeof component !== 'function' || component.length > 0) {
        return;
      }

      try {
        const loaded = (component as () => unknown)();
        if (loaded && typeof (loaded as Promise<unknown>).then === 'function') {
          componentLoadTasks.push(loaded as Promise<unknown>);
        }
      } catch {
        // 预取失败不影响正常导航
      }
    });

    if (componentLoadTasks.length === 0) {
      prefetchedPaths.add(path);
      return;
    }

    prefetchingPaths.add(path);
    void Promise.allSettled(componentLoadTasks)
      .then(() => {
        prefetchedPaths.add(path);
      })
      .finally(() => {
        prefetchingPaths.delete(path);
      });
  };

  const navigation = async (path: string) => {
    try {
      const route = routeMetaMap.get(path);
      const { openInNewWindow = false, query = {}, link } = route?.meta ?? {};

      // 检查是否有外链
      if (link && typeof link === 'string') {
        openWindow(link, { target: '_blank' });
        return;
      }

      if (isHttpUrl(path)) {
        openWindow(path, { target: '_blank' });
      } else if (openInNewWindow) {
        openRouteInNewWindow(resolveHref(path));
      } else {
        prefetch(path);
        await router.push({
          path,
          query,
        });
      }
    } catch (error) {
      console.error('Navigation failed:', error);
      throw error;
    }
  };

  const willOpenedByWindow = (path: string) => {
    return shouldOpenInNewWindow(path);
  };

  return { navigation, prefetch, willOpenedByWindow };
}

export { useNavigation };