package com.example.building.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.example.building.common.JwtUtil;
import com.example.building.entity.User;
import com.example.building.mapper.UserMapper;
import com.example.building.service.AuthService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Service;

import java.util.HashMap;
import java.util.Map;
import java.util.UUID;
import java.util.concurrent.TimeUnit;

/**
 * 认证服务实现类
 * 支持：手机号验证码登录、微信扫码登录、支付宝扫码登录
 */
@Service
public class AuthServiceImpl implements AuthService {

    @Autowired
    private UserMapper userMapper;

    @Autowired
    private JwtUtil jwtUtil;

    @Autowired
    private RedisTemplate<String, Object> redisTemplate;

    @Value("${jwt.expiration:7200000}")
    private Long expiration;

    /**
     * 发送验证码
     * 实际生产中应调用阿里云短信服务
     */
    @Override
    public void sendCode(String phone) {
        // 生成6位随机验证码
        String code = String.format("%06d", (int) (Math.random() * 1000000));
        // 存入Redis，5分钟有效
        redisTemplate.opsForValue().set("sms:code:" + phone, code, 5, TimeUnit.MINUTES);
        // TODO: 调用短信服务发送验证码
        System.out.println("验证码已发送: " + phone + " - " + code);
    }

    /**
     * 手机号验证码登录
     */
    @Override
    public Map<String, Object> phoneLogin(String phone, String code) {
        // 验证验证码
        String savedCode = (String) redisTemplate.opsForValue().get("sms:code:" + phone);
        if (savedCode == null || !savedCode.equals(code)) {
            throw new RuntimeException("验证码错误或已过期");
        }

        // 查询用户，不存在则创建
        User user = userMapper.selectOne(new LambdaQueryWrapper<User>()
                .eq(User::getPhone, phone));
        if (user == null) {
            user = new User();
            user.setUserId(UUID.randomUUID().toString());
            user.setPhone(phone);
            user.setUsername("用户" + phone.substring(7));
            user.setRole("sales");
            user.setStatus(1);
            userMapper.insert(user);
        }

        // 生成Token
        return generateTokens(user);
    }

    /**
     * 微信扫码登录
     * 实际生产中需要调用微信API获取openid
     */
    @Override
    public Map<String, Object> wechatLogin(String code) {
        // TODO: 调用微信API获取openid
        // String openid = wechatService.getOpenId(code);
        String openid = "wechat_" + code;

        // 查询用户，不存在则创建
        User user = userMapper.selectOne(new LambdaQueryWrapper<User>()
                .eq(User::getWechatOpenid, openid));
        if (user == null) {
            user = new User();
            user.setUserId(UUID.randomUUID().toString());
            user.setWechatOpenid(openid);
            user.setUsername("微信用户");
            user.setRole("sales");
            user.setStatus(1);
            userMapper.insert(user);
        }

        return generateTokens(user);
    }

    /**
     * 支付宝扫码登录
     * 实际生产中需要调用支付宝API获取openid
     */
    @Override
    public Map<String, Object> alipayLogin(String code) {
        // TODO: 调用支付宝API获取openid
        // String openid = alipayService.getOpenId(code);
        String openid = "alipay_" + code;

        // 查询用户，不存在则创建
        User user = userMapper.selectOne(new LambdaQueryWrapper<User>()
                .eq(User::getAlipayOpenid, openid));
        if (user == null) {
            user = new User();
            user.setUserId(UUID.randomUUID().toString());
            user.setAlipayOpenid(openid);
            user.setUsername("支付宝用户");
            user.setRole("sales");
            user.setStatus(1);
            userMapper.insert(user);
        }

        return generateTokens(user);
    }

    /**
     * 刷新Token
     */
    @Override
    public Map<String, Object> refreshToken(String refreshToken) {
        if (!jwtUtil.validateToken(refreshToken)) {
            throw new RuntimeException("刷新Token无效");
        }
        String userId = jwtUtil.getUserId(refreshToken);
        User user = userMapper.selectById(userId);
        if (user == null) {
            throw new RuntimeException("用户不存在");
        }
        return generateTokens(user);
    }

    /**
     * 获取当前用户信息
     */
    @Override
    public Map<String, Object> getCurrentUser(String userId) {
        User user = userMapper.selectById(userId);
        if (user == null) {
            throw new RuntimeException("用户不存在");
        }
        Map<String, Object> result = new HashMap<>();
        result.put("userId", user.getUserId());
        result.put("username", user.getUsername());
        result.put("phone", user.getPhone());
        result.put("role", user.getRole());
        return result;
    }

    /**
     * 退出登录
     */
    @Override
    public void logout(String token) {
        // 将token加入黑名单
        redisTemplate.opsForValue().set("blacklist:" + token, "1", 2, TimeUnit.HOURS);
    }

    /**
     * 生成Token和RefreshToken
     */
    private Map<String, Object> generateTokens(User user) {
        String token = jwtUtil.generateToken(user.getUserId(), user.getUsername(), user.getRole());
        String refreshToken = jwtUtil.generateRefreshToken(user.getUserId());

        Map<String, Object> result = new HashMap<>();
        result.put("token", token);
        result.put("refreshToken", refreshToken);
        result.put("userId", user.getUserId());
        result.put("username", user.getUsername());
        result.put("role", user.getRole());

        return result;
    }
}