package com.example.catchTheLetters.service.impl;

import com.example.catchTheLetters.service.EmailService;
import com.example.catchTheLetters.utils.R;
import jakarta.annotation.Resource;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.mail.javamail.JavaMailSenderImpl;
import org.springframework.mail.javamail.MimeMessageHelper;
import org.springframework.stereotype.Service;
import org.springframework.util.StringUtils;

import java.util.Date;
import java.util.UUID;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

@Service
public class EmailServiceImpl implements EmailService {

    /**
     * 注入邮件工具类
     */
    @Resource
    JavaMailSenderImpl javaMailSender;

    String str = "^([a-zA-Z0-9_\\.\\-])+\\@(([a-zA-Z0-9\\-])+\\.)+([a-zA-Z0-9]{2,4})+$";
    Pattern pattern = Pattern.compile(str);

    @Resource
    RedisServiceImpl redisService;

    @Value("${spring.mail.username}")
    private String sendMailer;


    @Override
    public R<String> sendEmail(String email) {
        try {
            if (!StringUtils.hasText(email)) {
                return R.fail("邮箱为空");
            }
            Matcher m = pattern.matcher(email);
            if (!m.matches()){
                return R.fail("格式错误，请重试");
            }
            //生成邮箱验证码
            String emailCode = UUID.randomUUID().toString().replaceAll("-", "").toUpperCase().substring(3, 9);
            //新建邮件对象
            MimeMessageHelper mimeMessageHelper = new MimeMessageHelper(javaMailSender.createMimeMessage(), true);
            //邮件发信人
            mimeMessageHelper.setFrom(sendMailer);
            //邮件收信人
            mimeMessageHelper.setTo(email);
            //邮件内容
            mimeMessageHelper.setText("你的验证码为：" + emailCode);
            //邮件信息
            mimeMessageHelper.setSentDate(new Date());

            //发送邮件
            javaMailSender.send(mimeMessageHelper.getMimeMessage());
            //将验证码和注册邮箱存入redis
            redisService.set(email,emailCode);
            return R.ok( "发送成功");
        }catch (Exception e){
            e.printStackTrace();
            return R.fail("邮箱异常，请重试");
        }
    }

    @Override
    public R<String> verifyEmail(String email, String emailCode) {
        String verify = redisService.get(emailCode).toString();
        if (verify.equals(email)){
            return R.ok("验证通过");
        }
        return R.fail("验证失败，请重试");
    }
}