import routerMap from "@/router/async/router.map";
import { mergeI18nFromRoutes } from "@/utils/i18nUtil";
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 route = {
            path: routeCfg.path || router.path || routeCfg.router,
            name: routeCfg.name || router.name,
            component: router.component,
            redirect: routeCfg.redirect || router.redirect,
            meta: {
                authority:
                    routeCfg.authority || router.authority || routeCfg.meta?.authority || router.meta?.authority || "*",
                icon: routeCfg.icon || router.icon || routeCfg.meta?.icon || router.meta?.icon,
                page: routeCfg.page || router.page || routeCfg.meta?.page || router.meta?.page,
                link: routeCfg.link || router.link || routeCfg.meta?.link || router.meta?.link,
            },
        };
        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) {
    
    // 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("accountModule/setRoutesConfig", routesConfig);
    } else {
        routesConfig = store.getters["accountModule/routesConfig"];
    }
    // 如果开启了异步路由，则加载异步路由配置
    const asyncRoutes = store.state.settingModule.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("settingModule/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,
};
