const express = require('express');
const router = express.Router();
const Customer = require('../models/Customer');

// 获取所有客户
router.get('/', 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', 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
router.post('/', 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', 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
router.delete('/:id', 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', 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
router.patch('/:id/credit', 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;