package main

import (
	"fmt"
	"net/smtp"
	"os"
	"strings"
)

const (
	SMTPServer string = "smtp.ionos.fr"
	SMTPUser   string = "admin@thegux.fr"
	SMTPPort   string = "25"
)

type Email struct {
	Sender    string
	Receivers []string
	Subject   string
	Content   string
}

func NewEmail(sender string, receivers []string, subject, content string) Email {
	return Email{
		Sender:    sender,
		Receivers: receivers,
		Subject:   subject,
		Content:   content,
	}
}

func (e Email) Generate() []byte {
	mail := fmt.Sprintf(
		"To: %s\nFrom: %s\nContent-Type: text/html\nSubject: %s\n\n%s",
		strings.Join(e.Receivers, ","),
		e.Sender,
		e.Sender,
		e.Content,
	)
	return []byte(mail)
}

func main() {
	fmt.Println("sending Thegux email test...")

	content := fmt.Sprintf("Hi!<br/><br/>This is an e-mail test, please do not reply.<br/><br/>Thegux Administrator<br/>%s", `<hr/>visit the website: <a href="https://thegux.fr">thegux.fr</a>`)
	email := NewEmail(SMTPUser, []string{"receiver@receiver.com"}, "e-mail test", content)

	auth := smtp.PlainAuth("", SMTPUser, "<password>", SMTPServer)
	fmt.Println("authentication: ok")

	if err := smtp.SendMail(SMTPServer+":"+SMTPPort, auth, email.Sender, email.Receivers, email.Generate()); err != nil {
		fmt.Printf("error while sending email, err=%v\n", err)
		os.Exit(1)
	}

	fmt.Println("email send successfully")
}