import routerMap from "@/router/async/router.map";
import { mergeI18nFromRoutes } from "@/utils/i18n";
import Router from "vue-router";
import deepMerge from "deepmerge";
import basicOptions from "@/router/async/config.async";

//应用配置
let appOptions = {
  router: undefined,
  i18n: undefined,
  store: undefined,
};

/**
 * 设置应用配置
 * @param options
 */
function setAppOptions(options) {
  const { router, store, i18n } = options;
  appOptions.router = router;
  appOptions.store = store;
  appOptions.i18n = i18n;
}

/**
 * 根据 路由配置 和 路由组件注册 解析路由
 * @param routesConfig 路由配置
 * @param routerMap 本地路由组件注册配置
 */
function parseRoutes(routesConfig, routerMap) {
  let routes = [];
  routesConfig.forEach((item) => {
    // 获取注册在 routerMap 中的 router，初始化 routeCfg
    let router = undefined,
      routeCfg = {};
    if (typeof item === "string") {
      router = routerMap[item];
      routeCfg = { path: (router && router.path) || item, router: item };
    } else if (typeof item === "object") {
      router = routerMap[item.router];
      routeCfg = item;
    }
    if (!router) {
      // console.warn(`can't find register for router ${routeCfg.router}, please register it in advance.`)
      router = typeof item === "string" ? { path: item, name: item } : item;
    }
    // 从 router 和 routeCfg 解析路由
    const meta = {
      authority: router.authority,
      icon: router.icon,
      page: router.page,
      link: router.link,
      params: router.params,
      query: router.query,
      ...router.meta,
    };
    const cfgMeta = {
      authority: routeCfg.authority,
      icon: routeCfg.icon,
      page: routeCfg.page,
      link: routeCfg.link,
      params: routeCfg.params,
      query: routeCfg.query,
      ...routeCfg.meta,
    };
    Object.keys(cfgMeta).forEach((key) => {
      if (
        cfgMeta[key] === undefined ||
        cfgMeta[key] === null ||
        cfgMeta[key] === ""
      ) {
        delete cfgMeta[key];
      }
    });
    Object.assign(meta, cfgMeta);
    const route = {
      path: routeCfg.path || router.path || routeCfg.router,
      name: routeCfg.name || router.name,
      component: router.component,
      redirect: routeCfg.redirect || router.redirect,
      meta: { ...meta, authority: meta.authority || "*" },
    };
    if (routeCfg.invisible || router.invisible) {
      route.meta.invisible = true;
    }
    if (routeCfg.children && routeCfg.children.length > 0) {
      route.children = parseRoutes(routeCfg.children, routerMap);
    }
    routes.push(route);
  });
  return routes;
}

/**
 * 加载路由
 * @param routesConfig {RouteConfig[]} 路由配置
 */
function loadRoutes(routesConfig) {
  //兼容 0.6.1 以下版本
  /*************** 兼容 version < v0.6.1 *****************/
  if (arguments.length > 0) {
    const arg0 = arguments[0];
    if (arg0.router || arg0.i18n || arg0.store) {
      routesConfig = arguments[1];
      console.error(
        "the usage of signature loadRoutes({router, store, i18n}, routesConfig) is out of date, please use the new signature: loadRoutes(routesConfig)."
      );
      console.error(
        "方法签名 loadRoutes({router, store, i18n}, routesConfig) 的用法已过时, 请使用新的方法签名 loadRoutes(routesConfig)。"
      );
    }
  }
  /*************** 兼容 version < v0.6.1 *****************/

  // 应用配置
  const { router, store, i18n } = appOptions;

  // 如果 routesConfig 有值，则更新到本地，否则从本地获取
  if (routesConfig) {
    store.commit("account/setRoutesConfig", routesConfig);
  } else {
    routesConfig = store.getters["account/routesConfig"];
  }
  // 如果开启了异步路由，则加载异步路由配置
  const asyncRoutes = store.state.setting.asyncRoutes;
  if (asyncRoutes) {
    if (routesConfig && routesConfig.length > 0) {
      const routes = parseRoutes(routesConfig, routerMap);
      const finalRoutes = mergeRoutes(basicOptions.routes, routes);
      formatRoutes(finalRoutes);
      router.options = { ...router.options, routes: finalRoutes };
      router.matcher = new Router({ ...router.options, routes: [] }).matcher;
      router.addRoutes(finalRoutes);
    }
  }
  // 提取路由国际化数据
  mergeI18nFromRoutes(i18n, router.options.routes);
  // 初始化Admin后台菜单数据
  // const rootRoute = router.options.routes.find((item) => item.path === "/");
  // const menuRoutes = rootRoute && rootRoute.children;
  // if (menuRoutes) {
  //   store.commit("setting/setMenuData", menuRoutes);
  // }
}

/**
 * 合并路由
 * @param target {Route[]}
 * @param source {Route[]}
 * @returns {Route[]}
 */
function mergeRoutes(target, source) {
  const routesMap = {};
  target.forEach((item) => (routesMap[item.path] = item));
  source.forEach((item) => (routesMap[item.path] = item));
  return Object.values(routesMap);
}

/**
 * 深度合并路由
 * @param target {Route[]}
 * @param source {Route[]}
 * @returns {Route[]}
 */
function deepMergeRoutes(target, source) {
  // 映射路由数组
  const mapRoutes = (routes) => {
    const routesMap = {};
    routes.forEach((item) => {
      routesMap[item.path] = {
        ...item,
        children: item.children ? mapRoutes(item.children) : undefined,
      };
    });
    return routesMap;
  };
  const tarMap = mapRoutes(target);
  const srcMap = mapRoutes(source);

  // 合并路由
  const merge = deepMerge(tarMap, srcMap);

  // 转换为 routes 数组
  const parseRoutesMap = (routesMap) => {
    return Object.values(routesMap).map((item) => {
      if (item.children) {
        item.children = parseRoutesMap(item.children);
      } else {
        delete item.children;
      }
      return item;
    });
  };
  return parseRoutesMap(merge);
}

/**
 * 格式化路由
 * @param routes 路由配置
 */
function formatRoutes(routes) {
  routes.forEach((route) => {
    const { path } = route;
    if (!path.startsWith("/") && path !== "*") {
      route.path = "/" + path;
    }
  });

  formatAuthority(routes);
}

/**
 * 格式化路由的权限配置
 * @param routes 路由
 * @param pAuthorities 父级路由权限配置集合
 */
function formatAuthority(routes, pAuthorities = []) {
  routes.forEach((route) => {
    const meta = route.meta;
    const defaultAuthority = pAuthorities[pAuthorities.length - 1] || {
      permission: "*",
    };
    if (meta) {
      let authority = {};
      if (!meta.authority) {
        authority = defaultAuthority;
      } else if (typeof meta.authority === "string") {
        authority.permission = meta.authority;
      } else if (typeof meta.authority === "object") {
        authority = meta.authority;
        const { role } = authority;
        if (typeof role === "string") {
          authority.role = [role];
        }
        if (!authority.permission && !authority.role) {
          authority = defaultAuthority;
        }
      }
      meta.authority = authority;
    } else {
      const authority = defaultAuthority;
      route.meta = { authority };
    }
    route.meta.pAuthorities = pAuthorities;
    if (route.children) {
      formatAuthority(route.children, [...pAuthorities, route.meta.authority]);
    }
  });
}

/**
 * 从路由 path 解析 i18n key
 * @param path
 * @returns {*}
 */
function getI18nKey(path) {
  const keys = path
    .split("/")
    .filter((item) => !item.startsWith(":") && item != "");
  keys.push("name");
  return keys.join(".");
}

/**
 * 加载导航守卫
 * @param guards
 * @param options
 */
function loadGuards(guards, options) {
  const { beforeEach, afterEach } = guards;
  const { router } = options;
  beforeEach.forEach((guard) => {
    if (guard && typeof guard === "function") {
      router.beforeEach((to, from, next) => guard(to, from, next, options));
    }
  });
  afterEach.forEach((guard) => {
    if (guard && typeof guard === "function") {
      router.afterEach((to, from) => guard(to, from, options));
    }
  });
}

export {
  parseRoutes,
  loadRoutes,
  formatAuthority,
  getI18nKey,
  loadGuards,
  deepMergeRoutes,
  formatRoutes,
  setAppOptions,
};