const express = require('express');
const router = express.Router();
const friendsStore = require('../store/friendsStore');

/**
 * 简单的认证中间件
 * 从 Authori-zation 头获取用户ID（实际项目应验证 JWT）
 */
function authMiddleware(req, res, next) {
  const token = req.headers['authori-zation'] || req.headers['authorization'];
  
  if (!token) {
    return res.status(401).json({
      code: 401,
      message: '请先登录'
    });
  }
  
  // 简单模拟：从 token 中提取用户ID
  // 实际项目应该验证 JWT 并解析用户信息
  // 这里假设 token 格式为 "Bearer userId" 或直接是 userId
  let userId;
  if (token.startsWith('Bearer ')) {
    userId = parseInt(token.substring(7), 10);
  } else {
    userId = parseInt(token, 10);
  }
  
  if (isNaN(userId)) {
    // 如果无法解析，默认使用用户ID 1
    userId = 1;
  }
  
  req.userId = userId;
  next();
}

/**
 * GET /api/front/users/search - 搜索用户
 */
router.get('/users/search', authMiddleware, (req, res) => {
  try {
    const { keyword, page = 1, pageSize = 20 } = req.query;
    
    if (!keyword || keyword.trim() === '') {
      return res.json({
        code: 200,
        message: 'success',
        data: { list: [], total: 0, page: 1, pageSize: 20 }
      });
    }
    
    const result = friendsStore.searchUsers(
      keyword.trim(),
      req.userId,
      parseInt(page, 10),
      parseInt(pageSize, 10)
    );
    
    res.json({
      code: 200,
      message: 'success',
      data: result
    });
  } catch (error) {
    console.error('搜索用户失败:', error);
    res.status(500).json({
      code: 500,
      message: '搜索失败'
    });
  }
});

/**
 * GET /api/front/friends - 获取好友列表
 */
router.get('/friends', authMiddleware, (req, res) => {
  try {
    const { page = 1, pageSize = 100 } = req.query;
    
    const result = friendsStore.getFriendList(
      req.userId,
      parseInt(page, 10),
      parseInt(pageSize, 10)
    );
    
    res.json({
      code: 200,
      message: 'success',
      data: result
    });
  } catch (error) {
    console.error('获取好友列表失败:', error);
    res.status(500).json({
      code: 500,
      message: '获取好友列表失败'
    });
  }
});

/**
 * POST /api/front/friends/request - 发送好友请求
 */
router.post('/friends/request', authMiddleware, (req, res) => {
  try {
    const { targetUserId, message = '' } = req.body;
    
    if (!targetUserId) {
      return res.status(400).json({
        code: 400,
        message: '请指定目标用户'
      });
    }
    
    if (targetUserId === req.userId) {
      return res.status(400).json({
        code: 400,
        message: '不能添加自己为好友'
      });
    }
    
    const result = friendsStore.sendFriendRequest(
      req.userId,
      parseInt(targetUserId, 10),
      message
    );
    
    if (result.success) {
      res.json({
        code: 200,
        message: '好友请求已发送',
        data: { requestId: result.requestId }
      });
    } else {
      res.status(400).json({
        code: 400,
        message: result.message
      });
    }
  } catch (error) {
    console.error('发送好友请求失败:', error);
    res.status(500).json({
      code: 500,
      message: '发送好友请求失败'
    });
  }
});

/**
 * GET /api/front/friends/requests - 获取好友请求列表
 */
router.get('/friends/requests', authMiddleware, (req, res) => {
  try {
    const { page = 1, pageSize = 100 } = req.query;
    
    const result = friendsStore.getFriendRequests(
      req.userId,
      parseInt(page, 10),
      parseInt(pageSize, 10)
    );
    
    res.json({
      code: 200,
      message: 'success',
      data: result
    });
  } catch (error) {
    console.error('获取好友请求失败:', error);
    res.status(500).json({
      code: 500,
      message: '获取好友请求失败'
    });
  }
});

/**
 * POST /api/front/friends/requests/:requestId/handle - 处理好友请求
 */
router.post('/friends/requests/:requestId/handle', authMiddleware, (req, res) => {
  try {
    const { requestId } = req.params;
    const { accept } = req.body;
    
    if (typeof accept !== 'boolean') {
      return res.status(400).json({
        code: 400,
        message: '请指定是否接受请求'
      });
    }
    
    const result = friendsStore.handleFriendRequest(
      parseInt(requestId, 10),
      req.userId,
      accept
    );
    
    if (result.success) {
      res.json({
        code: 200,
        message: accept ? '已添加好友' : '已拒绝请求'
      });
    } else {
      res.status(400).json({
        code: 400,
        message: result.message
      });
    }
  } catch (error) {
    console.error('处理好友请求失败:', error);
    res.status(500).json({
      code: 500,
      message: '处理好友请求失败'
    });
  }
});

/**
 * DELETE /api/front/friends/:friendId - 删除好友
 */
router.delete('/friends/:friendId', authMiddleware, (req, res) => {
  try {
    const { friendId } = req.params;
    
    const result = friendsStore.removeFriend(
      req.userId,
      parseInt(friendId, 10)
    );
    
    if (result.success) {
      res.json({
        code: 200,
        message: '已删除好友'
      });
    } else {
      res.status(400).json({
        code: 400,
        message: result.message || '删除失败'
      });
    }
  } catch (error) {
    console.error('删除好友失败:', error);
    res.status(500).json({
      code: 500,
      message: '删除好友失败'
    });
  }
});

module.exports = router;