/* 应用外壳：左侧菜单 + 顶栏 + 内容区，最后加载并挂载
   （ref / computed / createApp 等已在 util.js 里解构到全局） */

const App = {
  template: `
    <div class="layout">
      <aside class="sidebar">
        <div class="brand">
          <div class="brand-mark">沃</div>
          <div class="brand-text">
            <div class="brand-title">沃林学生管理系统</div>
            <div class="brand-sub">Student Manager</div>
          </div>
        </div>

        <nav class="nav">
          <template v-for="g in groups" :key="g.name">
            <div class="nav-group">{{ g.name }}</div>
            <div v-for="p in g.items" :key="p.key"
                 class="nav-item" :class="{ active: p.key === currentKey }"
                 @click="go(p.key)">
              <span v-html="icon(p.icon)"></span>
              <span>{{ p.title }}</span>
            </div>
          </template>
        </nav>

        <div class="sidebar-foot">
          接口文档：<a :href="docsUrl" target="_blank" style="color:#4F46E5">/docs</a><br>
          后端 127.0.0.1:8001
        </div>
      </aside>

      <div class="main">
        <header class="topbar">
          <div>
            <div class="topbar-title">{{ current.title }}</div>
            <div class="topbar-sub">{{ current.sub }}</div>
          </div>
          <div class="topbar-actions">
            <el-button @click="reload">
              <span style="margin-right:4px">↻</span>刷新本页
            </el-button>
          </div>
        </header>

        <section class="content">
          <component :is="current.component" :key="currentKey + '#' + reloadTick" />
        </section>
      </div>
    </div>
  `,

  setup() {
    const pages = window.PAGES;

    // 分组：按注册顺序把页面归到各自的分组里（总览 / 数据管理 / 统计分析）
    const groups = [];
    pages.forEach(p => {
      const name = p.group || '其他';
      let g = groups.find(x => x.name === name);
      if (!g) { g = { name, items: [] }; groups.push(g); }
      g.items.push(p);
    });

    const fallback = (pages[0] && pages[0].key) || '';
    const currentKey = ref(location.hash.replace(/^#\/?/, '') || fallback);

    // 刷新本页：改 key 让组件重新挂载，页面自己会重新拉数据
    const reloadTick = ref(0);
    const reload = () => { reloadTick.value++; };

    const current = computed(() =>
      pages.find(p => p.key === currentKey.value) || pages[0] || { title: '', sub: '', component: null });

    const go = (key) => {
      if (key === currentKey.value) { reload(); return; }
      location.hash = '#/' + key;
    };

    // 地址栏直接改 hash / 浏览器前进后退也能切页
    const onHash = () => {
      const k = location.hash.replace(/^#\/?/, '');
      if (k && k !== currentKey.value) currentKey.value = k;
    };
    onMounted(() => window.addEventListener('hashchange', onHash));
    onUnmounted(() => window.removeEventListener('hashchange', onHash));

    // 把地址栏补齐，刷新页面能停在当前页
    if (!location.hash) location.hash = '#/' + currentKey.value;

    // 前后端不同源了，/docs 这种站内相对路径会指到前端服务器上，必须用后端地址
    const docsUrl = API_BASE + '/docs';

    return { groups, currentKey, current, go, reload, reloadTick, icon, docsUrl };
  },
};

const app = createApp(App);

// 模板里写错组件名之类的错误，直接在界面上弹出来，比只看控制台快
app.config.errorHandler = (err) => {
  console.error(err);
  toastErr(err && err.message ? err.message : '页面出错了，请按 F12 看控制台');
};

app.use(ElementPlus, { locale: ElementPlusLocaleZhCn });
app.mount('#app');