<template>
    <div>
        
        <el-menu
            class="sidebar-el-menu"
            :default-active="onRoutes"
            :collapse="collapse"
            background-color="#324157"
            text-color="#bfcbd9"
            active-text-color="#9278FF"
            unique-opened
            mode="horizontal"
            router
        >
            <template v-for="item in menus">
                <template v-if="item.subs">
                    <el-submenu :index="item.index" :key="item.index">
                        <template slot="title">
                            <i :class="item.icon"></i>
                            <span slot="title">{{ item.title }}</span>
                        </template>
                        <template v-for="subItem in item.subs">
                            <el-submenu
                                v-if="subItem.subs"
                                :index="subItem.index"
                                :key="subItem.index"
                            >
                                <template slot="title">{{ subItem.title }}</template>
                                <el-menu-item
                                    v-for="(threeItem,i) in subItem.subs"
                                    :key="i"
                                    :index="threeItem.index"
                                >{{ threeItem.title }}</el-menu-item>
                            </el-submenu>
                            <el-menu-item
                                v-else
                                :index="subItem.index"
                                :key="subItem.index"
                            >{{ subItem.title }}</el-menu-item>
                        </template>
                    </el-submenu>
                </template>
                <template v-else>
                    <el-menu-item :index="item.index" :key="item.index">
                        <i :class="item.icon"></i>
                        <span slot="title">{{ item.title }}</span>
                    </el-menu-item>
                </template>
            </template>
        </el-menu>
    </div>
</template>

<script>
import bus from '../common/bus';
export default {
    data() {
        return {
            collapse: false,
            defaultMenus: [
                {
                    icon: 'el-icon-takeaway-box',
                    index: 'dashboard',
                    title: '考核管理'
                },
                {
                    icon: 'el-icon-collection',
                    index: 'achievement',
                    title: '成绩管理'
                },
                {
                    icon: 'el-icon-receiving',
                    index: 'evaluation',
                    title: '测评管理'
                },
                {
                    icon: 'el-icon-postcard',
                    index: 'project',
                    title: '实验项目管理'
                },
                {
                    icon: 'el-icon-user',
                    index: 'student',
                    title: '学生管理'
                },
                {
                    icon: 'el-icon-office-building',
                    index: 'backstage',
                    title: '业务后台'
                },
                {
                    icon: 'el-icon-setting',
                    index: 'system',
                    title: '系统设置'
                }
            ],
            menus: [],
            actives: {
                dashboard: ['addclass'],
                achievement: ['experiment','experimentVir','experimentTeach','addexperiment','addexperimentoptions','showExperiment','showExperimentoption','showExperimentoptions'],
                project: ['addproject','program','programOption','programOptions'],
                backstage: ['report']
            }
        };
    },
    computed: {
        onRoutes() {
            let actives = this.actives
            let path = this.$route.path.replace('/', '')
            for(let i in this.actives){
                if(actives[i].includes(path)) return i
            }
            return path
        }
    },
    created() {
        this.initMenu()
        // 通过 Event Bus 进行组件间通信，来折叠侧边栏
        bus.$on('collapse', msg => {
            this.collapse = msg;
            bus.$emit('collapse-content', msg);
        });
    },
    methods: {
        initMenu(){
            if(this.$config.dynamicRoute){
                let routes = this.$store.state.routes[1].children
                let menus = []
                this.defaultMenus.map(e => {
                    routes.find(n => n.path == e.index) && menus.push(e)
                })
                this.menus = menus
            }else{
                this.menus = this.defaultMenus
            }
        },
    }
};
</script>

<style scoped>
.sidebar::-webkit-scrollbar {
    width: 0;
}
.sidebar-el-menu:not(.el-menu--collapse) {
    width: 100%;
}
.el-menu.el-menu--horizontal{
    border-bottom: none;
}
.sidebar > ul {
    height: 100%;
}
</style>
