const express = require('express');
const router = express.Router();
const Customer = require('../models/Customer');
const { authMiddleware, requireRole } = require('../middleware/auth');
const { validate } = require('../middleware/validate');
const { schemas } = require('../middleware/validate');

// 获取所有客户（admin 或 store 可查）
router.get('/', authMiddleware, requireRole('admin', 'store'), async (req, res) => {
  try {
    const customers = await Customer.find();
    res.json({ success: true, data: customers });
  } catch (error) {
    res.status(500).json({ success: false, message: error.message });
  }
});

// 获取单个客户
router.get('/:id', authMiddleware, requireRole('admin', 'store'), async (req, res) => {
  try {
    const customer = await Customer.findById(req.params.id);
    if (!customer) return res.status(404).json({ success: false, message: '客户不存在' });
    res.json({ success: true, data: customer });
  } catch (error) {
    res.status(500).json({ success: false, message: error.message });
  }
});

// 创建客户（admin 或 store）
router.post('/', authMiddleware, requireRole('admin', 'store'), validate(schemas.customer), async (req, res) => {
  try {
    const customer = new Customer(req.body);
    await customer.save();
    res.status(201).json({ success: true, data: customer });
  } catch (error) {
    res.status(400).json({ success: false, message: error.message });
  }
});

// 更新客户
router.put('/:id', authMiddleware, requireRole('admin', 'store'), async (req, res) => {
  try {
    const customer = await Customer.findByIdAndUpdate(req.params.id, req.body, { new: true, runValidators: true });
    if (!customer) return res.status(404).json({ success: false, message: '客户不存在' });
    res.json({ success: true, data: customer });
  } catch (error) {
    res.status(400).json({ success: false, message: error.message });
  }
});

// 删除客户（仅 admin）
router.delete('/:id', authMiddleware, requireRole('admin'), async (req, res) => {
  try {
    const customer = await Customer.findByIdAndDelete(req.params.id);
    if (!customer) return res.status(404).json({ success: false, message: '客户不存在' });
    res.json({ success: true, message: '客户已删除' });
  } catch (error) {
    res.status(500).json({ success: false, message: error.message });
  }
});

// 搜索客户
router.get('/search/:keyword', authMiddleware, requireRole('admin', 'store'), async (req, res) => {
  try {
    const keyword = req.params.keyword;
    const customers = await Customer.find({
      $or: [
        { name: { $regex: keyword, $options: 'i' } },
        { phone: { $regex: keyword, $options: 'i' } },
        { customerId: { $regex: keyword, $options: 'i' } }
      ]
    });
    res.json({ success: true, data: customers });
  } catch (error) {
    res.status(500).json({ success: false, message: error.message });
  }
});

// 更新客户信用评分（admin 或 store）
router.patch('/:id/credit', authMiddleware, requireRole('admin', 'store'), async (req, res) => {
  try {
    const { creditScore } = req.body;
    let creditLevel = '优秀';
    if (creditScore < 60) creditLevel = '较差';
    else if (creditScore < 80) creditLevel = '一般';
    else if (creditScore < 90) creditLevel = '良好';

    const customer = await Customer.findByIdAndUpdate(
      req.params.id,
      { creditScore, creditLevel },
      { new: true }
    );
    if (!customer) return res.status(404).json({ success: false, message: '客户不存在' });
    res.json({ success: true, data: customer });
  } catch (error) {
    res.status(400).json({ success: false, message: error.message });
  }
});

module.exports = router;