/**
 * 该插件可根据菜单配置自动生成 ANTD menu组件
 * menuOptions示例：
 * [
 *  {
 *    name: '菜单名称',
 *    path: '菜单路由',
 *    meta: {
 *      icon: '菜单图标',
 *      invisible: 'boolean, 是否不可见, 默认 false',
 *    },
 *    children: [子菜单配置]
 *  },
 *  {
 *    name: '菜单名称',
 *    path: '菜单路由',
 *    meta: {
 *      icon: '菜单图标',
 *      invisible: 'boolean, 是否不可见, 默认 false',
 *    },
 *    children: [子菜单配置]
 *  }
 * ]
 *
 * i18n: 国际化配置。系统默认会根据 options route配置的 path 和 name 生成英文以及中文的国际化配置，如需自定义或增加其他语言，配置
 * 此项即可。如：
 * i18n: {
 *   messages: {
 *     zh_CN: {dashboard: {name: '监控中心'}}
 *      
 *   }
 * }
 **/
import Menu from "ant-design-vue/es/menu";
import Icon from "ant-design-vue/es/icon";
import fastEqual from "fast-deep-equal";
import {getI18nKey} from '@/utils/routerUtil'

const { Item, SubMenu } = Menu;

export default {
    name: "IMenu",
    props: {
        options: {
            type: Array,
            required: true,
        },
        theme: {
            type: String,
            required: false,
            default: "dark",
        },
        mode: {
            type: String,
            required: false,
            default: "inline",
        },
        collapsed: {
            type: Boolean,
            required: false,
            default: false,
        },
        i18n: Object,
        openKeys: Array,
    },
    data() {
        return {
            selectedKeys: [],
            sOpenKeys: [],
            cachedOpenKeys: [],
        };
    },
    computed: {
        menuTheme() {
            return this.theme == "light" ? this.theme : "dark";
        },
    },
    created() {
      this.updateMenu();
        if (this.options.length > 0 && !this.options[0].fullPath) {
            this.formatOptions(this.options, "");
        }
        // 自定义国际化配置
        if (this.i18n && this.i18n.messages) {
            const messages = this.i18n.messages;
            Object.keys(messages).forEach((key) => {
                this.$i18n.mergeLocaleMessage(key, messages[key]);
            });
        }
    },
    watch: {
        options(val) {
            if (val.length > 0 && !val[0].fullPath) {
                this.formatOptions(this.options, "");
            }
        },
        i18n(val) {
            if (val && val.messages) {
                const messages = this.i18n.messages;
                Object.keys(messages).forEach((key) => {
                    this.$i18n.mergeLocaleMessage(key, messages[key]);
                });
            }
        },
        collapsed(val) {
            if (val) {
                this.cachedOpenKeys = this.sOpenKeys;
                this.sOpenKeys = [];
            } else {
                this.sOpenKeys = this.cachedOpenKeys;
            }
        },
        $route: function() {
            this.updateMenu();
        },
        sOpenKeys(val) {
            this.$emit("openChange", val);
            this.$emit("update:openKeys", val);
        },
    },
    methods: {
        renderIcon: function(h, icon, key) {
            if (this.$scopedSlots.icon && icon && icon !== "none") {
                const vnodes = this.$scopedSlots.icon({ icon, key });
                vnodes.forEach((vnode) => {
                    vnode.data.class = vnode.data.class ? vnode.data.class : [];
                    vnode.data.class.push("anticon");
                });
                return vnodes;
            }
            return !icon || icon == "none" ? null : h(Icon, { props: { type: icon } });
        },
        renderMenuItem: function(h, menu) {
            let tag = "router-link";
            let config = {
                props: { to: menu.fullPath },
                attrs: { style: "overflow:hidden;white-space:normal;text-overflow:clip;" },
            };
            if (menu.meta && menu.meta.link) {
                tag = "a";
                config = {
                    attrs: {
                        style: "overflow:hidden;white-space:normal;text-overflow:clip;",
                        href: menu.meta.link,
                        target: "_blank",
                    },
                };
            }
            return h(Item, { key: menu.fullPath }, [
                h(tag, config, [
                    this.renderIcon(h, menu.meta ? menu.meta.icon : "none", menu.fullPath),
                    this.$t(getI18nKey(menu.fullPath)),
                ]),
            ]);
        },
        renderSubMenu: function(h, menu) {
            let this_ = this;
            let subItem = [
                h(
                    "span",
                    { slot: "title", attrs: { style: "overflow:hidden;white-space:normal;text-overflow:clip;" } },
                    [
                        this.renderIcon(h, menu.meta ? menu.meta.icon : "none", menu.fullPath),
                        this.$t(getI18nKey(menu.fullPath)),
                    ]
                ),
            ];
            let itemArr = [];
            menu.children.forEach(function(item) {
                itemArr.push(this_.renderItem(h, item));
            });
            return h(SubMenu, { key: menu.fullPath }, subItem.concat(itemArr));
        },
        renderItem: function(h, menu) {
            const meta = menu.meta;
            if (!meta || !meta.invisible) {
                let renderChildren = false;
                const children = menu.children;
                if (children != undefined) {
                    for (let i = 0; i < children.length; i++) {
                        const childMeta = children[i].meta;
                        if (!childMeta || !childMeta.invisible) {
                            renderChildren = true;
                            break;
                        }
                    }
                }
                return menu.children && renderChildren ? this.renderSubMenu(h, menu) : this.renderMenuItem(h, menu);
            }
        },
        renderMenu: function(h, menuTree) {
            let this_ = this;
            let menuArr = [];
            menuTree.forEach(function(menu, i) {
                menuArr.push(this_.renderItem(h, menu, "0", i));
            });
            return menuArr;
        },
      formatOptions(options, parentPath) {
          
            options.forEach((route) => {
                let isFullPath = route.path.substring(0, 1) == "/";
                route.fullPath = isFullPath ? route.path : parentPath + "/" + route.path;
                if (route.children) {
                    this.formatOptions(route.children, route.fullPath);
                }
            });
        
        },
        updateMenu() {
            const matchedRoutes = this.$route.matched.filter((item) => item.path !== "");
            this.selectedKeys = this.getSelectedKey(this.$route);
            let openKeys = matchedRoutes.map((item) => item.path);
            openKeys = openKeys.slice(0, openKeys.length - 1);
            if (!fastEqual(openKeys, this.sOpenKeys)) {
                this.collapsed || this.mode === "horizontal"
                    ? (this.cachedOpenKeys = openKeys)
                    : (this.sOpenKeys = openKeys);
            }
        },
        getSelectedKey(route) {
            return route.matched.map((item) => item.path);
        },
    },
    render(h) {
        return h(
            Menu,
            {
                props: {
                    theme: this.menuTheme,
                    mode: this.$props.mode,
                    selectedKeys: this.selectedKeys,
                    openKeys: this.openKeys ? this.openKeys : this.sOpenKeys,
                },
                on: {
                    "update:openKeys": (val) => {
                        this.sOpenKeys = val;
                    },
                    click: (obj) => {
                        obj.selectedKeys = [obj.key];
                        this.$emit("select", obj);
                    },
                },
            },
            this.renderMenu(h, this.options)
        );
    },
};