const mongoose = require('mongoose');

const answerSchema = new mongoose.Schema({
    questionId: {
        type: mongoose.Schema.Types.ObjectId,
        required: true
    },
    userAnswer: mongoose.Schema.Types.Mixed,
    isCorrect: {
        type: Boolean,
        required: true
    },
    score: {
        type: Number,
        required: true
    }
});

const resultSchema = new mongoose.Schema({
    exam: {
        type: mongoose.Schema.Types.ObjectId,
        ref: 'Exam',
        required: true
    },
    user: {
        type: mongoose.Schema.Types.ObjectId,
        ref: 'User',
        required: true
    },
    answers: [answerSchema],
    totalScore: {
        type: Number,
        required: true
    },
    maxScore: {
        type: Number,
        required: true
    },
    timeTaken: { // 用时(秒)
        type: Number,
        required: true
    },
    submittedAt: {
        type: Date,
        default: Date.now
    }
});

module.exports = mongoose.model('Result', resultSchema);