import type { AppRouteModule, AppRouteRecordRaw } from '/@/router/types';
import type { Router, RouteRecordNormalized } from 'vue-router';

import { getParentLayout, LAYOUT } from '/@/router/constant';
import { cloneDeep } from 'lodash-es';
import { warn } from '/@/utils/log';
import { createRouter, createWebHashHistory } from 'vue-router';

export type LayoutMapKey = 'LAYOUT';

const LayoutMap = new Map<LayoutMapKey, () => Promise<typeof import('*.vue')>>();

let dynamicViewsModules: Record<string, () => Promise<Recordable>>;

// Dynamic introduction
function asyncImportRoute(routes: AppRouteRecordRaw[] | undefined) {
  dynamicViewsModules = dynamicViewsModules || import.meta.glob('../../views/**/*.{vue,tsx}');
  if (!routes) return;
  routes.forEach((item) => {
    const { component, name } = item;
    const { children } = item;
    if (component) {
      item.component = dynamicImport(dynamicViewsModules, component as string);
    } else if (name) {
      item.component = getParentLayout();
    }
    children && asyncImportRoute(children);
  });
}

function dynamicImport(
  dynamicViewsModules: Record<string, () => Promise<Recordable>>,
  component: string
) {
  const keys = Object.keys(dynamicViewsModules);
  const matchKeys = keys.filter((key) => {
    let k = key.replace('../../views', '');
    const lastIndex = k.lastIndexOf('.');
    k = k.substring(0, lastIndex);
    return k === component;
  });
  if (matchKeys?.length === 1) {
    const matchKey = matchKeys[0];
    return dynamicViewsModules[matchKey];
  }
  if (matchKeys?.length > 1) {
    warn(
      'Please do not create `.vue` and `.TSX` files with the same file name in the same hierarchical directory under the views folder. This will cause dynamic introduction failure'
    );
    return;
  }
}

// Turn background objects into routing objects
export function transformObjToRoute<T = AppRouteModule>(routeList: AppRouteModule[]): T[] {
  LayoutMap.set('LAYOUT', LAYOUT);

  routeList.forEach((route) => {
    if (route.component) {
      if ((route.component as string).toUpperCase() === 'LAYOUT') {
        //route.component = LayoutMap.get(route.component as LayoutMapKey);
        route.component = LayoutMap.get((route.component as string).toUpperCase() as LayoutMapKey);
      } else {
        route.children = [cloneDeep(route)];
        route.component = LAYOUT;
        route.name = `${route.name}Parent`;
        route.path = '';
        const meta = route.meta || {};
        meta.single = true;
        meta.affix = false;
        route.meta = meta;
      }
    }
    route.children && asyncImportRoute(route.children);
  });
  return (routeList as unknown) as T[];
}

/**
 * Convert multi-level routing to level 2 routing
 */
export function flatRoutes(routeModules: AppRouteModule[]) {
  for (let index = 0; index < routeModules.length; index++) {
    const routeModule = routeModules[index];
    if (!isMultipleRoute(routeModule)) {
      continue;
    }
    promoteRouteLevel(routeModule);
  }
}

// Routing level upgrade
function promoteRouteLevel(routeModule: AppRouteModule) {
  // Use vue-router to splice menus
  let router: Router | null = createRouter({
    routes: [routeModule as any],
    history: createWebHashHistory(),
  });

  const routes = router.getRoutes();
  const children = cloneDeep(routeModule.children);
  addToChildren(routes, children || [], routeModule);
  router = null;

  routeModule.children = routeModule.children?.filter((item) => !item.children?.length);
}

// Add all sub-routes to the secondary route
function addToChildren(
  routes: RouteRecordNormalized[],
  children: AppRouteRecordRaw[],
  routeModule: AppRouteModule
) {
  for (let index = 0; index < children.length; index++) {
    const child = children[index];
    const route = routes.find((item) => item.name === child.name);
    if (route) {
      routeModule.children = routeModule.children || [];
      routeModule.children?.push(route as any);
      if (child.children?.length) {
        addToChildren(routes, child.children, routeModule);
      }
    }
  }
}

// Determine whether the level exceeds 2 levels
function isMultipleRoute(routeModule: AppRouteModule) {
  if (!routeModule || !Reflect.has(routeModule, 'children') || !routeModule.children?.length) {
    return false;
  }

  const children = routeModule.children;

  let flag = false;
  for (let index = 0; index < children.length; index++) {
    const child = children[index];
    if (child.children?.length) {
      flag = true;
      break;
    }
  }
  return flag;
}