ADD file via upload

results.js

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+const Result = require('../models/Result');
+const Exam = require('../models/Exam');
+
+// 提交考试结果
+exports.submitResult = async (req, res, next) => {
+    try {
+        const { examId, answers, timeTaken } = req.body;
+
+        // 验证考试
+        const exam = await Exam.findById(examId);
+        if (!exam) {
+            return res.status(404).json({ message: 'Exam not found' });
+        }
+
+        // 计算分数
+        let totalScore = 0;
+        const answerResults = exam.questions.map(question => {
+            const userAnswer = answers[question._id];
+            let isCorrect = false;
+            let score = 0;
+
+            if (question.type === 'text') {
+                // 简答题默认给一半分
+                if (userAnswer && userAnswer.trim().length > 0) {
+                    isCorrect = true;
+                    score = question.score / 2;
+                }
+            } else if (Array.isArray(question.answer)) {
+                // 多选题
+                const correctAnswers = [...question.answer].sort().toString();
+                const userAns = [...userAnswer].sort().toString();
+                isCorrect = correctAnswers === userAns;
+                score = isCorrect ? question.score : 0;
+            } else {
+                // 单选题
+                isCorrect = userAnswer === question.answer;
+                score = isCorrect ? question.score : 0;
+            }
+
+            totalScore += score;
+
+            return {
+                questionId: question._id,
+                userAnswer,
+                isCorrect,
+                score
+            };
+        });
+
+        // 保存结果
+        const result = new Result({
+            exam: examId,
+            user: req.user.id,
+            answers: answerResults,
+            totalScore,
+            maxScore: exam.questions.reduce((sum, q) => sum + q.score, 0),
+            timeTaken
+        });
+
+        await result.save();
+
+        res.status(201).json(result);
+    } catch (err) {
+        next(err);
+    }
+};
+
+// 获取用户成绩
+exports.getUserResults = async (req, res, next) => {
+    try {
+        const results = await Result.find({ user: req.user.id })
+            .populate('exam', 'title description')
+            .sort({ submittedAt: -1 });
+
+        res.json(results);
+    } catch (err) {
+        next(err);
+    }
+};
+
+// 获取考试所有成绩 (教师/管理员)
+exports.getExamResults = async (req, res, next) => {
+    try {
+        const results = await Result.find({ exam: req.params.id })
+            .populate('user', 'username')
+            .populate('exam', 'title')
+            .sort({ totalScore: -1 });
+
+        res.json(results);
+    } catch (err) {
+        next(err);
+    }
+};