package email

import (
	"crypto/tls"
	"fmt"
	"time"

	"apocapoc-api/internal/domain/services"

	"gopkg.in/mail.v2"
)

type SMTPConfig struct {
	Host         string
	Port         int
	Username     string
	Password     string
	From         string
	SupportEmail string
}

type SMTPService struct {
	config SMTPConfig
}

func NewSMTPService(config SMTPConfig) *SMTPService {
	return &SMTPService{
		config: config,
	}
}

func (s *SMTPService) Send(message services.EmailMessage) error {
	m := mail.NewMessage()
	m.SetHeader("From", s.config.From)
	m.SetHeader("To", message.To)
	m.SetHeader("Subject", message.Subject)

	if message.IsHTML {
		m.SetBody("text/html", message.Body)
	} else {
		m.SetBody("text/plain", message.Body)
	}

	dialer := mail.NewDialer(s.config.Host, s.config.Port, s.config.Username, s.config.Password)
	dialer.TLSConfig = &tls.Config{
		ServerName: s.config.Host,
	}

	if err := s.sendWithRetry(dialer, m); err != nil {
		return fmt.Errorf("failed to send email: %w", err)
	}

	return nil
}

func (s *SMTPService) sendWithRetry(dialer *mail.Dialer, message *mail.Message) error {
	maxRetries := 3
	var lastErr error

	for i := 0; i < maxRetries; i++ {
		if err := dialer.DialAndSend(message); err == nil {
			return nil
		} else {
			lastErr = err
			if i < maxRetries-1 {
				time.Sleep(time.Second * time.Duration(i+1))
			}
		}
	}

	return lastErr
}

func (s *SMTPService) GetConfig() SMTPConfig {
	return s.config
}