const express = require('express');
const router = express.Router();
const jwt = require('jsonwebtoken');
const rateLimit = require('express-rate-limit');
const Rider = require('../models/Rider');
const Order = require('../models/Order');
const { comparePassword } = require('../utils/password');
const { authMiddleware, requireRole } = require('../middleware/auth');
const { validate } = require('../middleware/validate');
const { schemas } = require('../middleware/validate');

// 登录限流（单独，更严格）
const loginLimiter = rateLimit({
  windowMs: 15 * 60 * 1000,
  max: 20,
  standardHeaders: true,
  legacyHeaders: false,
  message: { success: false, message: '登录尝试过于频繁，请15分钟后再试' }
});

// 骑手登录（无需鉴权）
router.post('/login', loginLimiter, validate(schemas.login), async (req, res) => {
  try {
    const { phone, password } = req.body;

    // 用 select(false) 主动拉取 password 字段
    const rider = await Rider.findOne({ phone }).select('+password');
    if (!rider) {
      return res.status(401).json({ success: false, message: '手机号或密码错误' });
    }

    // bcrypt 比对密码
    const isMatch = await comparePassword(password, rider.password);
    if (!isMatch) {
      return res.status(401).json({ success: false, message: '手机号或密码错误' });
    }

    // 签发 JWT（包含 id、role、jti）
    const token = jwt.sign(
      { id: rider._id, role: rider.role, type: 'rider', phone: rider.phone, jti: Math.random().toString(36) },
      process.env.JWT_SECRET,
      { expiresIn: process.env.JWT_EXPIRES_IN || '7d' }
    );

    res.json({
      success: true,
      data: {
        id: rider._id,
        riderId: rider.riderId,
        name: rider.name,
        phone: rider.phone,
        status: rider.status,
        role: rider.role,
        rating: rider.rating,
        totalOrders: rider.totalOrders,
        totalIncome: rider.totalIncome,
        token
      }
    });
  } catch (error) {
    res.status(500).json({ success: false, message: "服务器内部错误" });
  }
});

// 获取骑手信息（需登录，且只能查看自己；admin/store 可查看任意骑手）
router.get('/:id', authMiddleware, async (req, res) => {
  try {
    const isSelf = req.params.id === req.user.id;
    const isPrivileged = ['admin', 'store'].includes(req.user.role);
    if (!isSelf && !isPrivileged) {
      return res.status(403).json({ success: false, message: '无权查看该骑手信息' });
    }
    const rider = await Rider.findById(req.params.id);
    if (!rider) {
      return res.status(404).json({ success: false, message: '骑手不存在' });
    }
    res.json({ success: true, data: rider });
  } catch (error) {
    res.status(500).json({ success: false, message: "服务器内部错误" });
  }
});

// 更新骑手信息（需登录本人，或 admin/store）
router.put('/:id', authMiddleware, async (req, res) => {
  try {
    const isSelf = req.params.id === req.user.id;
    const isPrivileged = ['admin', 'store'].includes(req.user.role);
    if (!isSelf && !isPrivileged) {
      return res.status(403).json({ success: false, message: '无权修改该骑手信息' });
    }
    // 不允许通过 PUT 修改密码和 role（仅 admin 可改 role）
    const { password, ...safeBody } = req.body;
    if (req.body.role && !isPrivileged) {
      return res.status(403).json({ success: false, message: '无权修改角色' });
    }
    const updateData = isPrivileged ? req.body : safeBody;
    const rider = await Rider.findByIdAndUpdate(
      req.params.id,
      updateData,
      { new: true, runValidators: true }
    );
    if (!rider) {
      return res.status(404).json({ success: false, message: '骑手不存在' });
    }
    res.json({ success: true, data: rider });
  } catch (error) {
    res.status(400).json({ success: false, message: "服务器内部错误" });
  }
});

// 获取骑手的订单（需登录本人，或 admin/store）
router.get('/:id/orders', authMiddleware, async (req, res) => {
  try {
    const isSelf = req.params.id === req.user.id;
    const isPrivileged = ['admin', 'store'].includes(req.user.role);
    if (!isSelf && !isPrivileged) {
      return res.status(403).json({ success: false, message: '无权查看该骑手的订单' });
    }
    const orders = await Order.find({ rider: req.params.id })
      .populate('customer', 'name phone')
      .populate('vehicle', 'vehicleId model color')
      .sort({ createdAt: -1 });
    res.json({ success: true, data: orders });
  } catch (error) {
    res.status(500).json({ success: false, message: "服务器内部错误" });
  }
});

module.exports = router;