import { computed, nextTick, ref, shallowRef } from 'vue';
import type { RouteRecordRaw } from 'vue-router';
import { defineStore } from 'pinia';
import { useBoolean } from '@sa/hooks';
import type { CustomRoute, ElegantConstRoute, LastLevelRouteKey, RouteKey, RouteMap } from '@elegant-router/types';
import { fetchGetUserRoutes, fetchIsRouteExist } from '@/service/api';
import { SetupStoreId } from '@/enum';
import { getRouteName, getRoutePath } from '@/router/elegant/transform';
import { getGlobalRouter } from '@/router/instance';
import { useAuthStore } from '../auth';
import { useDictStore } from '../dict';
import { useTabStore } from '../tab';
import {
  filterAuthRoutesByRoles,
  getBreadcrumbsByRoute,
  getCacheRouteNames,
  getGlobalMenusByAuthRoutes,
  getSelectedMenuKeyPathByKey,
  isRouteExistByRouteName,
  sortRoutesByOrder,
  transformMenuToSearchMenus,
  updateLocaleOfGlobalMenus
} from './shared';

type RouteModule = typeof import('@/router/routes');

async function loadRouteModule(): Promise<RouteModule> {
  return import('@/router/routes');
}

function createRootRoute(redirect: string): CustomRoute {
  return {
    name: 'root',
    path: '/',
    redirect,
    meta: {
      title: 'root',
      constant: true
    }
  };
}

export const useRouteStore = defineStore(SetupStoreId.Route, () => {
  const authStore = useAuthStore();
  const dictStore = useDictStore();
  const tabStore = useTabStore();
  const { bool: isInitConstantRoute, setBool: setIsInitConstantRoute } = useBoolean();
  const { bool: isInitAuthRoute, setBool: setIsInitAuthRoute } = useBoolean();

  /**
   * 权限路由模式
   *
   * 建议开发环境先使用 static，生产环境再切换到 dynamic。
   * 在 static 模式下，权限路由由前端结合 "@elegant-router/vue" 自动生成。
   */
  const authRouteMode = ref(import.meta.env.VITE_AUTH_ROUTE_MODE);

  /** 首页路由 key */
  const routeHome = ref(import.meta.env.VITE_ROUTE_HOME);

  /**
   * 设置首页路由
   *
   * @param routeKey 路由 key
   */
  function setRouteHome(routeKey: LastLevelRouteKey) {
    routeHome.value = routeKey;
  }

  /** 常量路由 */
  const constantRoutes = shallowRef<ElegantConstRoute[]>([]);

  function addConstantRoutes(routes: ElegantConstRoute[]) {
    const constantRoutesMap = new Map<string, ElegantConstRoute>([]);

    routes.forEach(route => {
      constantRoutesMap.set(route.name, route);
    });

    constantRoutes.value = Array.from(constantRoutesMap.values());
  }

  /** 权限路由 */
  const authRoutes = shallowRef<ElegantConstRoute[]>([]);

  function addAuthRoutes(routes: ElegantConstRoute[]) {
    const authRoutesMap = new Map<string, ElegantConstRoute>([]);

    routes.forEach(route => {
      authRoutesMap.set(route.name, route);
    });

    authRoutes.value = Array.from(authRoutesMap.values());
  }

  const removeRouteFns: (() => void)[] = [];

  /** 全局菜单 */
  const menus = ref<App.Global.Menu[]>([]);
  const searchMenus = computed(() => transformMenuToSearchMenus(menus.value));

  /** 生成全局菜单 */
  function getGlobalMenus(routes: ElegantConstRoute[]) {
    menus.value = getGlobalMenusByAuthRoutes(routes);
  }

  /** 根据当前语言更新全局菜单文案 */
  function updateGlobalMenusByLocale() {
    menus.value = updateLocaleOfGlobalMenus(menus.value);
  }

  /** 需要缓存的路由 */
  const cacheRoutes = ref<RouteKey[]>([]);

  /**
   * 排除缓存的路由
   *
   * 用于重置指定路由缓存
   */
  const excludeCacheRoutes = ref<RouteKey[]>([]);

  /**
   * 提取需要缓存的路由
   *
   * @param routes Vue 路由
   */
  function getCacheRoutes(routes: RouteRecordRaw[]) {
    cacheRoutes.value = getCacheRouteNames(routes);
  }

  /**
   * 重置路由缓存
   *
   * @default router.currentRoute.value.name 当前路由名
   * @param routeKey
   */
  async function resetRouteCache(routeKey?: RouteKey) {
    const routeName = routeKey || (getGlobalRouter().currentRoute.value.name as RouteKey);

    excludeCacheRoutes.value.push(routeName);

    await nextTick();

    excludeCacheRoutes.value = [];
  }

  /** 全局面包屑 */
  const breadcrumbs = computed(() => getBreadcrumbsByRoute(getGlobalRouter().currentRoute.value, menus.value));

  /** 重置 store */
  async function resetStore() {
    // setup store 没有内置 $reset，需要显式重置内部状态。
    // 否则 isInitConstantRoute / isInitAuthRoute 一直停在 true，导致下面 initConstantRoute 早返，
    // 路由被 resetVueRoutes 摘掉后无法重新注册，菜单和导航都会失效。
    setIsInitConstantRoute(false);
    setIsInitAuthRoute(false);
    constantRoutes.value = [];
    authRoutes.value = [];
    menus.value = [];
    cacheRoutes.value = [];
    excludeCacheRoutes.value = [];

    resetVueRoutes();

    // 重置后需要重新初始化常量路由
    await initConstantRoute();
  }

  /** 重置已注册到 Vue Router 的路由 */
  function resetVueRoutes() {
    removeRouteFns.forEach(fn => fn());
    removeRouteFns.length = 0;
  }

  /** 初始化常量路由 */
  async function initConstantRoute() {
    if (isInitConstantRoute.value) return;

    const { createStaticRoutes } = await loadRouteModule();
    const staticRoute = createStaticRoutes();

    addConstantRoutes(staticRoute.constantRoutes);

    await handleConstantAndAuthRoutes();

    setIsInitConstantRoute(true);

    tabStore.initHomeTab();
  }

  /** 初始化权限路由 */
  async function initAuthRoute() {
    // 先确保用户信息已经初始化
    if (!authStore.userInfo.userId) {
      await authStore.initUserInfo();
    }

    await dictStore.initDictCache();

    if (authRouteMode.value === 'static') {
      await initStaticAuthRoute();
    } else {
      await initDynamicAuthRoute();
    }

    tabStore.initHomeTab();
  }

  /** 初始化静态权限路由 */
  async function initStaticAuthRoute() {
    const { createStaticRoutes } = await loadRouteModule();
    const { authRoutes: staticAuthRoutes } = createStaticRoutes();

    if (authStore.isStaticSuper) {
      addAuthRoutes(staticAuthRoutes);
    } else {
      const filteredAuthRoutes = filterAuthRoutesByRoles(staticAuthRoutes, authStore.userInfo.roles);

      addAuthRoutes(filteredAuthRoutes);
    }

    await handleConstantAndAuthRoutes();

    setIsInitAuthRoute(true);
  }

  /** 初始化动态权限路由 */
  async function initDynamicAuthRoute() {
    const { data, error } = await fetchGetUserRoutes();

    if (!error) {
      const { routes, home } = data;

      addAuthRoutes(routes);

      await handleConstantAndAuthRoutes();

      setRouteHome(home);

      await handleUpdateRootRouteRedirect(home);

      setIsInitAuthRoute(true);
    } else {
      // 获取用户路由失败时，重置认证状态
      authStore.resetStore();
    }
  }

  /** 统一处理常量路由和权限路由 */
  async function handleConstantAndAuthRoutes() {
    const { getAuthVueRoutes } = await loadRouteModule();
    // 常量路由优先：动态权限路由中与常量路由 name 重复的项剔除，避免菜单出现重复入口（如 workbench）
    const constantRouteNames = new Set(constantRoutes.value.map(route => route.name));
    const dedupedAuthRoutes = authRoutes.value.filter(route => !constantRouteNames.has(route.name));
    const allRoutes = [...constantRoutes.value, ...dedupedAuthRoutes];

    const sortRoutes = sortRoutesByOrder(allRoutes);

    const vueRoutes = getAuthVueRoutes(sortRoutes);

    resetVueRoutes();

    addRoutesToVueRouter(vueRoutes);

    getGlobalMenus(sortRoutes);

    getCacheRoutes(vueRoutes);
  }

  /**
   * 将路由注册到 Vue Router
   *
   * @param routes Vue 路由
   */
  function addRoutesToVueRouter(routes: RouteRecordRaw[]) {
    routes.forEach(route => {
      const removeFn = getGlobalRouter().addRoute(route);
      addRemoveRouteFn(removeFn);
    });
  }

  /**
   * 记录移除路由的方法
   *
   * @param fn
   */
  function addRemoveRouteFn(fn: () => void) {
    removeRouteFns.push(fn);
  }

  /**
   * 在动态权限路由模式下更新根路由的重定向
   *
   * @param redirectKey 重定向目标路由 key
   */
  async function handleUpdateRootRouteRedirect(redirectKey: LastLevelRouteKey) {
    const redirect = getRoutePath(redirectKey);

    if (redirect) {
      const { getAuthVueRoutes } = await loadRouteModule();
      const rootRoute = createRootRoute(redirect);
      const router = getGlobalRouter();

      router.removeRoute(rootRoute.name);

      const [rootVueRoute] = getAuthVueRoutes([rootRoute]);

      router.addRoute(rootVueRoute);
    }
  }

  /**
   * 判断权限路由是否存在
   *
   * @param routePath 路由路径
   */
  async function getIsAuthRouteExist(routePath: RouteMap[RouteKey]) {
    const routeName = getRouteName(routePath);

    if (!routeName) {
      return false;
    }

    if (authRouteMode.value === 'static') {
      const { createStaticRoutes } = await loadRouteModule();
      const { authRoutes: staticAuthRoutes } = createStaticRoutes();
      return isRouteExistByRouteName(routeName, staticAuthRoutes);
    }

    const { data } = await fetchIsRouteExist(routeName);

    return data;
  }

  /**
   * 获取当前选中菜单的 key 路径
   *
   * @param selectedKey 当前选中的菜单 key
   */
  function getSelectedMenuKeyPath(selectedKey: string) {
    return getSelectedMenuKeyPathByKey(selectedKey, menus.value);
  }

  async function onRouteSwitchWhenLoggedIn() {
    await authStore.initUserInfo();
  }

  async function onRouteSwitchWhenNotLoggedIn() {
    // 这里可以放未登录情况下也需要执行的全局初始化逻辑
  }

  return {
    resetStore,
    routeHome,
    authRoutes,
    menus,
    searchMenus,
    updateGlobalMenusByLocale,
    cacheRoutes,
    excludeCacheRoutes,
    resetRouteCache,
    breadcrumbs,
    initConstantRoute,
    isInitConstantRoute,
    initAuthRoute,
    isInitAuthRoute,
    setIsInitAuthRoute,
    getIsAuthRouteExist,
    getSelectedMenuKeyPath,
    onRouteSwitchWhenLoggedIn,
    onRouteSwitchWhenNotLoggedIn
  };
});
