package com.backend.webbackend.Tools;
import com.backend.webbackend.mapper.UserMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.stereotype.Service;
import org.springframework.web.multipart.MultipartFile;

import java.util.regex.Pattern;

@Service
public class Tools {

    private static final Pattern CN_MOBILE_PATTERN = Pattern.compile("^1[3-9]\\d{9}$");
    // 定义编码器，解决 PASSWORD_ENCODER 无法解析
    private static final BCryptPasswordEncoder PASSWORD_ENCODER = new BCryptPasswordEncoder();

    @Autowired
    private final UserMapper userMapper;

    public Tools(UserMapper userMapper) {
        this.userMapper = userMapper;
    }

    //校验用户名唯一性
    public boolean checkUsernameUnique(String username) {
        return userMapper.countByUsername(username)==0;
    }

    //校验手机号格式合法性
    public boolean checkPhoneUnique(String phone) {
        if (phone == null) {
            return false;
        }
        String p = phone.trim();
        return CN_MOBILE_PATTERN.matcher(p).matches();
    }

    // 用户名密码加密处理（BCrypt：加盐慢哈希）
    public String encryptPassword(String password) {
        if (password == null || password.trim().isEmpty()) {
            throw new IllegalArgumentException("密码不能为空");
        }
        return PASSWORD_ENCODER.encode(password);
    }

    // 校验明文密码是否匹配已加密密码
    public boolean matchesPassword(String rawPassword, String encodedPassword) {
        if (rawPassword == null || encodedPassword == null) {
            return false;
        }
        return PASSWORD_ENCODER.matches(rawPassword, encodedPassword);
    }

    //文件保存
    public String saveIcoFile(MultipartFile icoFile){

        return "";
    }
}