package com.bycrm.service.impl;

import com.bycrm.common.Constants;
import com.bycrm.dto.ChangePasswordDTO;
import com.bycrm.dto.ResetPasswordDTO;
import com.bycrm.entity.User;
import com.bycrm.exception.BusinessException;
import com.bycrm.mapper.UserMapper;
import com.bycrm.service.UserService;
import com.bycrm.util.JwtUtil;
import com.bycrm.vo.UserInfoVO;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.stereotype.Service;

/**
 * 用户服务实现
 */
@Service
public class UserServiceImpl implements UserService {

    private final UserMapper userMapper;
    private final JwtUtil jwtUtil;
    private final BCryptPasswordEncoder passwordEncoder = new BCryptPasswordEncoder();

    public UserServiceImpl(UserMapper userMapper, JwtUtil jwtUtil) {
        this.userMapper = userMapper;
        this.jwtUtil = jwtUtil;
    }

    @Override
    public String login(com.bycrm.dto.LoginDTO loginDTO) {
        User user = userMapper.selectByUsername(loginDTO.getUsername());
        if (user == null) {
            throw new BusinessException("用户名或密码错误");
        }

        if (user.getStatus() == Constants.USER_STATUS_DISABLED) {
            throw new BusinessException("用户已被禁用");
        }

        if (!passwordEncoder.matches(loginDTO.getPassword(), user.getPassword())) {
            throw new BusinessException("用户名或密码错误");
        }

        return jwtUtil.generateToken(user.getId(), user.getUsername(), user.getRole(), user.getDealerId());
    }

    @Override
    public User getUserById(Long id) {
        return userMapper.selectById(id);
    }

    @Override
    public User getUserByUsername(String username) {
        return userMapper.selectByUsername(username);
    }

    @Override
    public UserInfoVO getCurrentUser(String token) {
        Long userId = jwtUtil.getUserIdFromToken(token);
        User user = userMapper.selectById(userId);
        if (user == null) {
            throw new BusinessException("用户不存在");
        }

        UserInfoVO vo = new UserInfoVO();
        vo.setUserId(user.getId());
        vo.setUsername(user.getUsername());
        vo.setRealName(user.getRealName());
        vo.setDealerId(user.getDealerId());
        vo.setDealerName(user.getDealerName());
        vo.setRole(user.getRole());
        vo.setRoleDesc(user.getRole() == Constants.USER_ROLE_ADMIN ? "管理员" : "经销商用户");
        return vo;
    }

    @Override
    public void changePassword(Long userId, ChangePasswordDTO dto) {
        User user = userMapper.selectById(userId);
        if (user == null) {
            throw new BusinessException("用户不存在");
        }

        // 验证原密码
        if (!passwordEncoder.matches(dto.getOldPassword(), user.getPassword())) {
            throw new BusinessException("原密码错误");
        }

        // 新密码不能与原密码相同
        if (dto.getOldPassword().equals(dto.getNewPassword())) {
            throw new BusinessException("新密码不能与原密码相同");
        }

        // 加密新密码并更新
        String encodedPassword = passwordEncoder.encode(dto.getNewPassword());
        user.setPassword(encodedPassword);
        userMapper.update(user);
    }

    @Override
    public void resetPassword(ResetPasswordDTO dto) {
        User user = userMapper.selectById(dto.getUserId());
        if (user == null) {
            throw new BusinessException("用户不存在");
        }

        // 管理员不能重置自己的密码（应使用修改密码功能）
        if (user.getRole() == Constants.USER_ROLE_ADMIN) {
            throw new BusinessException("不能重置管理员密码");
        }

        // 加密新密码并更新
        String encodedPassword = passwordEncoder.encode(dto.getNewPassword());
        user.setPassword(encodedPassword);
        userMapper.update(user);
    }

    public static void main(String[] args) {
        BCryptPasswordEncoder passwordEncoder = new BCryptPasswordEncoder();
        String rawPassword = "59cce3254e6d76ec6bad2d84ae56b5da3e118b2f22d0d2b2d780356cbe3c0881";
        String encodedPassword = passwordEncoder.encode(rawPassword);
        System.out.println("Encoded Password: " + encodedPassword);
    }
}