package mail

import (
	"errors"
	"fmt"
	"github.com/jordan-wright/email"
	"net/mail"
	"net/smtp"
)

var (
	ErrEmailEmpty   = errors.New("mail is empty")
	ErrEmailInvalid = errors.New("invalid email")
)

// Config menyimpan pengaturan untuk koneksi SMTP.
type Config struct {
	Host     string
	Port     string
	Username string
	Password string
	From     string
}

// SMTP adalah implementasi Sender untuk mengirim mail melalui SMTP
type SMTP struct {
	name              string
	fromEmailAddress  string
	smtpServerAddress string
	smtpAuthAddress   smtp.Auth
}

// New membuat instance baru SMTP dengan konfigurasi.
func New(cfg *Config) (Sender, error) {
	if err := validateEmail(cfg.From); err != nil {
		return nil, fmt.Errorf("invalid from address: %w", err)
	}

	return &SMTP{
		name:              cfg.From,
		fromEmailAddress:  cfg.From,
		smtpServerAddress: fmt.Sprintf("%s:%s", cfg.Host, cfg.Port),
		smtpAuthAddress:   smtp.PlainAuth("", cfg.Username, cfg.Password, cfg.Host),
	}, nil
}

// Send mengirim mail ke penerima dengan subjek, konten HTML, dan data lainnya.
func (s *SMTP) Send(recipient, subject string, htmlContent string, data any) error {
	e := email.NewEmail()
	e.From = s.fromEmailAddress
	e.To = []string{recipient}
	e.Subject = subject
	e.HTML = []byte(htmlContent)
	return s.sendEmail(e)
}

func (s *SMTP) sendEmail(e *email.Email) error {
	return e.Send(s.smtpServerAddress, s.smtpAuthAddress)
}

func validateEmail(email string) error {
	if email == "" {
		return ErrEmailEmpty
	}

	if _, err := mail.ParseAddress(email); err != nil {
		return ErrEmailInvalid
	}

	return nil
}