/* 班级管理：新增 / 修改 / 逻辑删除
   班级表只有「编号 + 开课时间」两列，没有班级名，所以界面上一律显示成 "编号1 · 2026-09-01 开班" */

window.PAGES.push({
  key: 'classes',
  title: '班级管理',
  sub: '班级开课时间，班主任与任课老师来自老师模块',
  group: '数据管理',
  icon: 'class',

  component: {
    name: 'ClassesPage',
    template: `
      <div>
        <div class="card">
          <div class="card-head">
            <div>
              <div class="card-title">班级列表</div>
              <div class="card-hint">
                共 {{ rows.length }} 个班级；班主任和任课老师由老师模块反查得到
              </div>
            </div>
            <div class="card-tools">
              <el-button @click="load">刷新</el-button>
              <el-button type="primary" @click="openCreate">＋ 新增班级</el-button>
            </div>
          </div>

          <el-table :data="rows" v-loading="loading" border stripe row-key="class_id">
            <el-table-column prop="class_id" label="班级编号" width="100" />
            <el-table-column label="开课时间" width="140">
              <template #default="{ row }">{{ dash(fmtDate(row.start_time)) }}</template>
            </el-table-column>
            <el-table-column label="班主任" width="130">
              <template #default="{ row }">
                <span :class="{ muted: !row.head_teacher_name || row.head_teacher_name === '暂无' }">
                  {{ row.head_teacher_name || '暂无' }}
                </span>
              </template>
            </el-table-column>
            <el-table-column label="任课老师">
              <template #default="{ row }">
                <span :class="{ muted: !row.course_teacher_names || row.course_teacher_names === '暂无' }">
                  {{ row.course_teacher_names || '暂无' }}
                </span>
              </template>
            </el-table-column>
            <el-table-column label="操作" width="140" fixed="right">
              <template #default="{ row }">
                <el-button link type="primary" @click="openEdit(row)">编辑</el-button>
                <el-button link type="danger" @click="remove(row)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>

          <el-alert class="mt12" type="info" :closable="false" show-icon
                    title="删除保护：班里还有学生或老师时不允许删除，后端会返回中文提示" />
        </div>

        <el-dialog v-model="dialog" :title="editing ? '编辑班级' : '新增班级'" width="480px" destroy-on-close>
          <el-form ref="formRef" :model="form" :rules="rules" label-width="88px">
            <el-form-item label="开课时间" prop="start_time">
              <el-date-picker v-model="form.start_time" type="date" value-format="YYYY-MM-DD"
                              placeholder="选择开课日期" style="width:100%" />
            </el-form-item>
            <el-alert type="info" :closable="false" show-icon
                      title="开课时间会用来生成学生学号的前八位，请认真填写" />
          </el-form>
          <template #footer>
            <el-button @click="dialog = false">取消</el-button>
            <el-button type="primary" :loading="saving" @click="submit">保存</el-button>
          </template>
        </el-dialog>
      </div>
    `,

    setup() {
      const loading = ref(false);
      const saving = ref(false);
      const rows = ref([]);
      const dialog = ref(false);
      const editing = ref(null);
      const formRef = ref(null);
      const form = ref({ start_time: null });

      const rules = {
        start_time: [{ required: true, message: '请选择开课时间', trigger: 'change' }],
      };

      // 一定要重新拉列表：新增/修改接口返回的班主任和任课老师永远是"暂无"，
      // 那两个字段是 DAO 在列表查询里才挂上去的。
      // 顺便把结果写回共享缓存，别的页面的班级下拉/名称映射也就跟着更新了。
      const load = async () => {
        loading.value = true;
        try {
          rows.value = await ClassApi.list({ limit: 1000 });
          Cache.classes = rows.value;
          Cache.loaded.classes = true;
        } catch (e) { toastErr(e); }
        finally { loading.value = false; }
      };

      const openCreate = () => {
        editing.value = null;
        form.value = { start_time: null };
        dialog.value = true;
      };

      const openEdit = (row) => {
        editing.value = row.class_id;
        // 回参是 "2026-09-01T00:00:00"，日期选择器只认前半段
        form.value = { start_time: fmtDate(row.start_time) || null };
        dialog.value = true;
      };

      const submit = async () => {
        if (!formRef.value) return;
        try { await formRef.value.validate(); } catch (e) { return; }
        saving.value = true;
        try {
          if (editing.value) {
            await ClassApi.update(editing.value, form.value);
            toastOk('修改成功');
          } else {
            await ClassApi.create(form.value);
            toastOk('新增成功');
          }
          dialog.value = false;
          await load();
        } catch (e) { toastErr(e); }
        finally { saving.value = false; }
      };

      const remove = async (row) => {
        try {
          await ElementPlus.ElMessageBox.confirm(
            `确定删除班级「编号${row.class_id}」吗？`,
            '删除确认', { type: 'warning', confirmButtonText: '确定删除', cancelButtonText: '取消' });
        } catch (e) { return; }
        try {
          await ClassApi.remove(row.class_id);
          toastOk('删除成功');
          await load();
        } catch (e) { toastErr(e); }
      };

      onMounted(load);

      return { loading, saving, rows, dialog, editing, formRef, form, rules,
               load, openCreate, openEdit, submit, remove, dash, fmtDate };
    },
  },
});