/* 成绩管理：按学号查成绩，再做增删改
   成绩模块的五个接口都用业务学号 stu_no，参数字段是 query 不是 JSON body，
   这里通过 ScoreApi 调用，不再关心细节 */

window.PAGES.push({
  key: 'scores',
  title: '成绩管理',
  sub: '按学生维护每次考核的成绩',
  group: '数据管理',
  icon: 'score',

  component: {
    name: 'ScoresPage',
    template: `
      <div>
        <div class="card">
          <div class="filters">
            <el-select v-model="stuNo" placeholder="请选择学生（可按学号/姓名搜索）" filterable clearable
                       style="width:320px" @change="onPickStudent">
              <el-option v-for="s in students" :key="s.stu_no" :label="studentLabel(s)" :value="s.stu_no" />
            </el-select>
            <el-button @click="load" :disabled="!stuNo">刷新</el-button>
            <el-button type="primary" :disabled="!stuNo" @click="openCreate">＋ 新增成绩</el-button>
          </div>

          <template v-if="stuNo">
            <div class="card-head">
              <div>
                <div class="card-title">{{ currentName }} 的成绩</div>
                <div class="card-hint">
                  学号 {{ stuNo }} · 共 {{ rows.length }} 次考核<span v-if="rows.length">
                  · 平均 {{ avgScore }} 分</span>
                </div>
              </div>
            </div>

            <el-table :data="rows" v-loading="loading" border stripe>
              <el-table-column prop="exam_order" label="考核序次" width="120" />
              <el-table-column label="成绩" width="140">
                <template #default="{ row }">
                  <!-- 60 分是后端统计不及格时用的固定阈值，这里跟着一起标红 -->
                  <span :style="{ color: row.score < 60 ? '#E34948' : '', fontWeight: row.score < 60 ? 600 : 400 }">
                    {{ row.score }}
                  </span>
                  <el-tag v-if="row.score < 60" size="small" type="danger" effect="plain" style="margin-left:8px">
                    不及格
                  </el-tag>
                </template>
              </el-table-column>
              <el-table-column label="操作" width="140">
                <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-empty v-if="!loading && !rows.length" description="该学生暂无成绩记录" />
          </template>

          <el-empty v-else description="请先在上方选择一个学生" />
        </div>

        <el-dialog v-model="dialog" :title="editing ? '编辑成绩' : '新增成绩'" width="480px" destroy-on-close>
          <el-form ref="formRef" :model="form" :rules="rules" label-width="88px">
            <el-form-item label="学生">
              <el-input :model-value="currentName + '（' + form.stu_no + '）'" disabled />
            </el-form-item>
            <el-form-item label="考核序次" prop="exam_order">
              <el-input-number v-model="form.exam_order" :min="1" :max="999"
                               controls-position="right" :disabled="!!editing" style="width:100%" />
            </el-form-item>
            <el-form-item label="成绩" prop="score">
              <el-input-number v-model="form.score" :min="0" :max="100" :precision="1" :step="0.5"
                               controls-position="right" style="width:100%" />
            </el-form-item>
            <el-alert v-if="editing" type="info" :closable="false" show-icon
                      title="学号和考核序次是联合主键，只能在新增时确定，编辑只改分数" />
          </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 students = ref([]);
      const stuNo = ref(null);
      const dialog = ref(false);
      const editing = ref(null);
      const formRef = ref(null);
      const form = ref({ stu_no: null, exam_order: 1, score: 80 });

      const rules = {
        exam_order: [{ required: true, message: '请填写考核序次', trigger: 'blur' }],
        score: [{ required: true, message: '请填写成绩', trigger: 'blur' }],
      };

      const currentName = computed(() => {
        const s = students.value.find(x => x.stu_no === stuNo.value);
        return s ? (s.stu_name || '未命名') : '';
      });

      const avgScore = computed(() => {
        if (!rows.value.length) return 0;
        const sum = rows.value.reduce((a, r) => a + Number(r.score || 0), 0);
        return Math.round((sum / rows.value.length) * 10) / 10;
      });

      const load = async () => {
        if (!stuNo.value) { rows.value = []; return; }
        loading.value = true;
        try {
          rows.value = await ScoreApi.listByStuNo(stuNo.value);
          rows.value.sort((a, b) => a.exam_order - b.exam_order);
        } catch (e) { toastErr(e); }
        finally { loading.value = false; }
      };

      const onPickStudent = () => { load(); };

      const openCreate = () => {
        editing.value = null;
        // 序次默认接着最后一条往后排，省得每次手填
        const next = rows.value.length
          ? Math.max.apply(null, rows.value.map(r => r.exam_order)) + 1 : 1;
        form.value = { stu_no: stuNo.value, exam_order: next, score: 80 };
        dialog.value = true;
      };

      const openEdit = (row) => {
        editing.value = { stu_no: row.stu_no, exam_order: row.exam_order };
        form.value = { stu_no: row.stu_no, exam_order: row.exam_order, score: row.score };
        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 ScoreApi.update(form.value.stu_no, form.value.exam_order, form.value.score);
            toastOk('修改成功');
          } else {
            await ScoreApi.add(form.value.stu_no, form.value.exam_order, form.value.score);
            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(
            `确定删除第 ${row.exam_order} 次考核的成绩（${row.score} 分）吗？`,
            '删除确认', { type: 'warning', confirmButtonText: '确定删除', cancelButtonText: '取消' });
        } catch (e) { return; }
        try {
          await ScoreApi.del(row.stu_no || stuNo.value, row.exam_order);
          toastOk('删除成功');
          await load();
        } catch (e) { toastErr(e); }
      };

      onMounted(async () => {
        try { students.value = await Cache.loadStudents(); }
        catch (e) { toastErr(e); }
      });

      return { loading, saving, rows, students, stuNo, dialog, editing, formRef, form, rules,
               currentName, avgScore, load, onPickStudent, openCreate, openEdit, submit, remove,
               studentLabel };
    },
  },
});