package com.bruce.sams.service.impl;

import com.baomidou.mybatisplus.core.toolkit.Wrappers;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.bruce.sams.Entity.SysUser;
import com.bruce.sams.Exception.User.IncorrectPasswordException;
import com.bruce.sams.Exception.User.UserNotFoundException;
import com.bruce.sams.Utils.PasswordEncoder;
import com.bruce.sams.Utils.TokenUtil;
import com.bruce.sams.mapper.SysUserMapper;
import com.bruce.sams.service.SysLoginService;
import jakarta.annotation.Resource;
import org.springframework.stereotype.Service;

@Service
public class SysLoginServiceImpl extends ServiceImpl<SysUserMapper, SysUser>
        implements SysLoginService {

    @Resource
    private PasswordEncoder passwordEncoder;

    /**
     * 用户登录验证
     * @param schoolId 学号
     * @param password 原始密码
     * @return 如果登录成功返回用户信息和Token，否则返回null
     */
    @Override
    public String login(String schoolId, String password) {
        // 查找用户
        SysUser user = this.getOne(Wrappers.<SysUser>lambdaQuery().eq(SysUser::getSchoolId, schoolId));

        //如果用户不存在，抛出用户未找到异常
        if (user == null) {
            throw new UserNotFoundException("用户不存在");
        }

        // 检查密码是否正确
        if (!passwordEncoder.matches(password, user.getPasswd())) {
            throw new IncorrectPasswordException("密码错误");
        }

        // 登录成功，生成Token

        // 返回Token
        return TokenUtil.generateToken(user.getUserId().toString());
    }

}