const express = require('express');
const router = express.Router();
const {
    getQuestions,
    createQuestion,
    addAnswer,
    deleteQuestion,
    deleteAnswer
} = require('../utils/qa-utils');

// 认证中间件
const authMiddleware = (req, res, next) => {
    if (!req.session.user) {
        return res.status(401).json({
            success: false,
            message: '未登录'
        });
    }
    next();
};

// 获取所有问题
router.get('/questions', (req, res) => {
    try {
        const questions = getQuestions();
        res.json({ success: true, questions });
    } catch (error) {
        console.error('获取问题列表失败:', error);
        res.status(500).json({ success: false, message: '获取问题列表失败', error: error.message });
    }
});

// 创建新问题
router.post('/questions', authMiddleware, (req, res) => {
    try {
        const { title, content } = req.body;
        const username = req.session.user.username;

        if (!title || !content) {
            return res.status(400).json({ success: false, message: '标题和内容不能为空' });
        }

        const result = createQuestion(title, content, username);
        res.status(201).json(result);
    } catch (error) {
        console.error('创建问题失败:', error);
        res.status(500).json({ success: false, message: '创建问题失败', error: error.message });
    }
});

// 添加回答
router.post('/questions/:questionId/answers', authMiddleware, (req, res) => {
    try {
        const { questionId } = req.params;
        const { content } = req.body;
        const username = req.session.user.username;
        const accessLevel = req.session.user.access_level;

        if (!content) {
            return res.status(400).json({ success: false, message: '回答内容不能为空' });
        }

        // 检查用户权限
        if (!accessLevel || accessLevel < 2) {
            return res.status(403).json({ success: false, message: '权限不足，需要开发者及以上权限' });
        }

        const result = addAnswer(questionId, content, username);
        res.status(201).json(result);
    } catch (error) {
        console.error('添加回答失败:', error);
        res.status(500).json({ success: false, message: '添加回答失败', error: error.message });
    }
});

// 删除问题
router.delete('/questions/:questionId', authMiddleware, (req, res) => {
    try {
        const { questionId } = req.params;
        const accessLevel = req.session.user.access_level;

        // 检查用户权限
        if (!accessLevel || accessLevel < 3) {
            return res.status(403).json({ success: false, message: '权限不足，需要组长及以上权限' });
        }

        const result = deleteQuestion(questionId);
        res.json(result);
    } catch (error) {
        console.error('删除问题失败:', error);
        res.status(500).json({ success: false, message: '删除问题失败', error: error.message });
    }
});

// 删除回答
router.delete('/answers/:answerId', authMiddleware, (req, res) => {
    try {
        const { answerId } = req.params;
        const accessLevel = req.session.user.access_level;

        // 检查用户权限
        if (!accessLevel || accessLevel < 3) {
            return res.status(403).json({ success: false, message: '权限不足，需要组长及以上权限' });
        }

        const result = deleteAnswer(answerId);
        res.json(result);
    } catch (error) {
        console.error('删除回答失败:', error);
        res.status(500).json({ success: false, message: '删除回答失败', error: error.message });
    }
});

module.exports = router;