package com.bruce.sams.service.impl;

import com.bruce.sams.common.enums.UserStatus;
import com.bruce.sams.common.exception.AccountDisabledException;
import com.bruce.sams.common.exception.PasswordIncorrectException;
import com.bruce.sams.common.exception.UserNotFoundException;
import com.bruce.sams.common.utils.PasswordUtil;
import com.bruce.sams.common.utils.TokenUtil;
import com.bruce.sams.domain.entity.LoginRequest;
import com.bruce.sams.domain.sys.User;
import com.bruce.sams.mapper.RoleMapper;
import com.bruce.sams.mapper.UserMapper;
import com.bruce.sams.service.AuthService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

/**
 * 认证服务类，支持 用户名、学号、邮箱 登录
 */
@Service
public class AuthServiceImpl implements AuthService {

    @Autowired
    private UserMapper userMapper;

    @Autowired
    private RoleMapper roleMapper;

    /**
     * 处理用户认证，支持用户名、学号、邮箱登录
     *
     * @param loginRequest 登录请求体（包含 username / schoolId / email + password）
     * @return JWT 令牌（成功）或 null（失败）
     */
    public String authenticate(LoginRequest loginRequest) {
        User user = null;

        // 根据提供的信息查询用户
        if (!loginRequest.getUsername().isEmpty()) {
            user = userMapper.findByUsername(loginRequest.getUsername());
        } else if (!loginRequest.getSchoolId().isEmpty()) {
            user = userMapper.findBySchoolId(loginRequest.getSchoolId());
        } else if (!loginRequest.getEmail().isEmpty()) {
            user = userMapper.findByEmail(loginRequest.getEmail());
        }
        System.out.println(user);
        // 用户不存在
        if (user == null) {
            throw new UserNotFoundException();
        }

        // 检查密码是否匹配
        if (!PasswordUtil.matches(loginRequest.getPassword(), user.getPassword())) {

            throw new PasswordIncorrectException();
        }

        // 检查账号是否被禁用
        if (UserStatus.BANNED.equals(user.getStatus())) {
            throw new AccountDisabledException();
        }
        List<String> roleKeys = roleMapper.getRoleKeysByUserId(user.getUserId());
        // 生成 JWT 令牌
        return TokenUtil.generateToken(user,roleKeys);
    }
}