package repository

import (
	"backend/pkg/notification/config"
	"backend/pkg/notification/domain"
	"backend/pkg/notification/domain/repository"
	"context"
	"fmt"

	"backend/pkg/library/errs"
	"backend/pkg/library/errs/code"

	"github.com/zeromicro/go-zero/core/logx"
	"gopkg.in/gomail.v2"
)

type SMTPMailUseCaseParam struct {
	Conf config.SMTPConfig
}

type SMTPMailRepository struct {
	Client *gomail.Dialer
}

func MustSMTPUseCase(param SMTPMailUseCaseParam) repository.MailRepository {
	return &SMTPMailRepository{
		Client: gomail.NewDialer(
			param.Conf.Host,
			param.Conf.Port,
			param.Conf.Username,
			param.Conf.Password,
		),
	}
}

func (repo *SMTPMailRepository) SendMail(ctx context.Context, req repository.MailReq) error {
	// 檢查 context 是否已取消
	if ctx.Err() != nil {
		return ctx.Err()
	}

	// 構建郵件
	m := gomail.NewMessage()
	m.SetHeader("From", req.From)
	m.SetHeader("To", req.To...)
	m.SetHeader("Subject", req.Subject)
	m.SetBody("text/html", req.Body)

	// 直接發送，不使用 goroutine pool
	// 讓 delivery usecase 統一管理重試和超時
	if err := repo.Client.DialAndSend(m); err != nil {
		return errs.ThirdPartyErrorL(
			code.CloudEPNotification,
			domain.FailedToSendEmailErrorCode,
			logx.WithContext(ctx),
			[]logx.LogField{
				{Key: "func", Value: "SMTPMailRepository.SendMail"},
				{Key: "req", Value: req},
				{Key: "err", Value: err.Error()},
			},
			fmt.Sprintf("failed to send mail by smtp: %v", err)).Wrap(err)
	}

	logx.WithContext(ctx).Infof("Email sent successfully via SMTP to %v", req.To)
	return nil
}