<template>
  <div class="wrapper">
    <!-- 页面头部部分 -->
    <div class="header">
      <div class="logo">学员综合评定管理系统</div>
      <!-- 水平一级菜单 -->
      <div style="float:left;">
        <el-menu
          mode="horizontal"
          text-color="#000000"
          active-text-color="#3989fa"
          :default-active="toIndex"
          @select="handleSelect">
          <el-menu-item v-for="(item, index) in itemList" :index="item.path" :key="index">
            <span slot="title">{{ item.title }}</span>
          </el-menu-item>
        </el-menu>
      </div>

      <div class="header-right">
        <div class="header-user-con">
          <!-- 切换主题 -->
          <div @click="handleChangeStyle()">
            <el-tooltip content="切换主题" placement="bottom">
              <i :class="globalTheme ? 'el-icon-moon' : 'el-icon-sunny'"></i>
            </el-tooltip>
          </div>
          <!-- 用户头像 -->
          <div class="user-avator">
            <img src="../../assets/img/img.jpg"/>
          </div>
          <!-- 用户名下拉菜单 -->
          <el-dropdown class="user-name" trigger="click" @command="handleCommand">
            <span class="el-dropdown-link"> {{ username }} <i class="el-icon-caret-bottom"></i></span>
            <el-dropdown-menu slot="dropdown">
              <el-dropdown-item disabled>修改密码</el-dropdown-item>
              <el-dropdown-item command="loginout">退出登录</el-dropdown-item>
            </el-dropdown-menu>
          </el-dropdown>
        </div>
      </div>
    </div>

    <!-- 页面左侧二级菜单栏，和主体内容区域部分 -->
    <el-main>

    </el-main>

  </div>
</template>

<script>
export default {
  data(){
    return{
      itemList: [    // 水平一级菜单栏的菜单
        { path: '/home', title: '首页' },
        { path: '/personal', title: '个人中心' },
        { path: '/overview', title: '排名总览' },
        { path: '/result', title: '结果公示' },
        { path: '/permission', title: '管理员权限' },
      ],
      globalTheme: false,
    }
  },
  computed: {
    username(){
      return localStorage.getItem('ms_username') || '';
    },
    toIndex(){  // 根据路径绑定到对应的一级菜单，防止页面刷新重新跳回第一个
      return '/' + this.$route.path.split('/')[1];
    },
  },
  created() {
    this.globalTheme = JSON.parse(localStorage.getItem('global_theme'));
    bus.$emit('global_theme', this.globalTheme);  // 将 globalTheme 的值传给父组件
  },
  methods: {
    handleSelect(path){  // 切换菜单栏
      this.$router.push({
        path: path
      });
    },
    handleCommand(command){  // 用户名下拉菜单选择事件
      if(command == 'loginout'){
        localStorage.removeItem('ms_username');
        this.$router.push({
          path: '/Login'
        });
      }
    },
    handleChangeStyle(){  // 切换主题
      this.globalTheme = !this.globalTheme;
      localStorage.setItem('global_theme', this.globalTheme);  // 本地存储选择的 globalTheme
      bus.$emit('global_theme', this.globalTheme);  // 将 globalTheme 的值传给父组件
    }
  }
}
</script>

<style scoped>
.wrapper {
  width: 100%;
  height: 100%;
  background: #f0f0f0;
}
.header {
  position: relative;
  box-sizing: border-box;
  width: 100%;
  height: 20px;
  font-size: 22px;
}
.header .logo {
  float: left;
  margin-left: 50px;
  margin-top: 15px;
  height: 29px;
  width: 220px;
  vertical-align: middle;
}
/* --------------- 用户头像区域的样式 ---------------- */
.header-right {
  float: right;
  padding-right: 50px;
}
.header-user-con {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 60px;
}
.user-avator {
  margin-left: 20px;
}
.user-avator img {
  display: block;
  width: 40px;
  height: 40px;
  border-radius: 50%;
}
.user-name {
  margin-left: 10px;
}
.el-dropdown-link {
  cursor: pointer;
}
.el-dropdown-menu__item {
  text-align: center;
}
/* --------------- 水平一级菜单栏的样式--------------------- */
.el-menu.el-menu--horizontal {
  border-bottom: none !important;
  float: left;
  margin-left: 50px;
  background: transparent;
}
.el-menu--horizontal > .el-menu-item.is-active {
  /* border-bottom: 2px solid #3989fa;
  color: #3989fa; */
  font-weight: bold;
}
.el-menu--horizontal > .el-menu-item {
  font-size: 16px;
  margin: 0 15px;
}
</style>
