package com.example.demo.user.service.impl;

import cn.hutool.core.util.IdUtil;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.example.demo.common.utils.Md5Util;
import com.example.demo.common.utils.TokenUtils;
import com.example.demo.user.domain.User;
import com.example.demo.user.dto.LoginDto;
import com.example.demo.user.dto.UserDto;
import com.example.demo.user.service.UserService;
import com.example.demo.user.dao.UserMapper;
import com.example.demo.user.vo.ResultVo;
import lombok.extern.slf4j.Slf4j;
import org.redisson.api.RLock;
import org.redisson.api.RedissonClient;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Service;

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

/**
* @author 徐乐
* @description 针对表【user(用户基础信息表)】的数据库操作Service实现
* @createDate 2025-06-04 17:31:35
*/
@Slf4j
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User>
    implements UserService{

    @Autowired
    private UserMapper userMapper;
    @Autowired
    private RedissonClient redissonClient;
    @Autowired
    private RedisTemplate<String,String> redisTemplate;
    @Override
    public ResultVo register(UserDto dto) {
        QueryWrapper<User> userQueryWrapper = new QueryWrapper<>();
        userQueryWrapper.eq("phone", dto.getPhone());
        log.info("加锁");
        RLock lock = redissonClient.getLock(dto.getPhone());
        try {
            log.info("获取锁");
            boolean lockSuccess = lock.tryLock(3, TimeUnit.SECONDS);
            if (!lockSuccess) {
                throw new RuntimeException("操作频繁,请稍后再试");
            }
            User user = userMapper.selectOne(userQueryWrapper);
            if (user != null) {
                return ResultVo.error("用户已存在");
            }
            log.info("注册");
            User u = new User();
            u.setId(IdUtil.getSnowflake().nextId());
            u.setUsername(dto.getUsername());
            //生成盐值
            String uuid = UUID.randomUUID().toString().replaceAll("-", "");
            u.setSalt(uuid);
            //获取密码
            String password = dto.getPassword();
            //加密
            String md5Password = Md5Util.MD5(uuid + password);
            u.setPassword(md5Password);
            u.setEmail(dto.getEmail());
            u.setPhone(dto.getPhone());
            u.setAvatar(dto.getAvatar());
            userMapper.insert(u);
            return ResultVo.success("注册成功");
        } catch (Exception e) {
            e.printStackTrace();
            throw new RuntimeException("注册过程中出现异常,请稍后再试");
        } finally {
            if (lock.isLocked() && lock.isHeldByCurrentThread()) {
                log.info("释放锁");
                lock.unlock();
            }
        }
    }

    @Override
    public ResultVo login(LoginDto dto) {
        QueryWrapper<User> userQueryWrapper = new QueryWrapper<>();
        userQueryWrapper.eq("phone",dto.getPhone());
        User user = userMapper.selectOne(userQueryWrapper);
        if (user==null){
            return ResultVo.error("用户不存在");
        }
        //获取盐值
        String salt = user.getSalt();
        //获取密码
        String password = dto.getPassword();
        //加密
        String encryptedPassword = Md5Util.MD5(salt + password);
        if (encryptedPassword.equals(user.getPassword())){
            String token = TokenUtils.createJwtToken(user.getId().toString());
            redisTemplate.opsForValue().set("userToken:",token);
            return ResultVo.success("登录成功");
        }
        return ResultVo.error("用户名或密码有误");
    }
}