first commit

controllers/levelController.js

@@ -0,0 +1,76 @@
+const Level = require('../models/level');
+const Degree = require('../models/degree');
+
+// GET /admin/level
+exports.index = async (req, res) => {
+  try {
+    const levels = await Level.find();
+    res.render('admin/level/index', {
+      levels,
+      user: req.session.user,
+      layout: 'layouts/admin',
+      title: 'Quản lý Cấp độ'
+    });
+  } catch (err) {
+    console.error('levelController.index error:', err);
+    req.flash('error', 'Đã xảy ra lỗi khi tải danh sách cấp độ');
+    res.redirect('/admin/dashboard');
+  }
+};
+
+// POST /admin/level/create
+exports.create = async (req, res) => {
+  try {
+    const { type } = req.body;
+
+    if (!type) {
+      req.flash('error', 'Type is required');
+      return res.redirect('back');
+    }
+
+    await Level.create({ type });
+    req.flash('success', 'Level created');
+    res.redirect('/admin/level');
+  } catch (err) {
+    console.error('levelController.create error:', err);
+    req.flash('error', 'Đã xảy ra lỗi khi tạo cấp độ');
+    res.redirect('back');
+  }
+};
+
+// POST /admin/level/:id/edit
+exports.update = async (req, res) => {
+  try {
+    const { id } = req.params;
+    const { type } = req.body;
+
+    await Level.findByIdAndUpdate(id, { type });
+    req.flash('success', 'Level updated');
+    res.redirect('/admin/level');
+  } catch (err) {
+    console.error('levelController.update error:', err);
+    req.flash('error', 'Đã xảy ra lỗi khi cập nhật cấp độ');
+    res.redirect('back');
+  }
+};
+
+// POST /admin/level/:id/delete
+exports.destroy = async (req, res) => {
+  try {
+    const { id } = req.params;
+    const count = await Degree.countDocuments({ level: id });
+
+    if (count > 0) {
+      req.flash('error', 'Cannot delete: Level is referenced by existing degrees');
+      return res.redirect('back');
+    }
+
+    await Level.findByIdAndDelete(id);
+    req.flash('success', 'Level deleted');
+    res.redirect('/admin/level');
+  } catch (err) {
+    console.error('levelController.destroy error:', err);
+    req.flash('error', 'Đã xảy ra lỗi khi xóa cấp độ');
+    res.redirect('back');
+  }
+};