package email

import (
	"github.com/spf13/viper"
	"github.com/wneessen/go-mail"
)

// SMTPMailer is a SMTP mailer.
type SMTPMailer struct {
	client *mail.Client
	from   Email
}

// NewMailer returns a configured SMTP Mailer.
func NewMailer() (Mailer, error) {
	if err := parseTemplates(); err != nil {
		return nil, err
	}

	smtp := struct {
		Host     string
		Port     int
		User     string
		Password string
	}{
		viper.GetString("email_smtp_host"),
		viper.GetInt("email_smtp_port"),
		viper.GetString("email_smtp_user"),
		viper.GetString("email_smtp_password"),
	}

	if smtp.Host == "" {
		return NewMockMailer(), nil
	}

	client, err := mail.NewClient(smtp.Host, mail.WithPort(smtp.Port),
		mail.WithSMTPAuth(mail.SMTPAuthPlain),
		mail.WithUsername(smtp.User), mail.WithPassword(smtp.Password))
	if err != nil {
		return nil, err
	}
	s := &SMTPMailer{
		client: client,
		from:   NewEmail(viper.GetString("email_from_name"), viper.GetString("email_from_address")),
	}
	return s, nil
}

// Send sends the mail via smtp.
func (m *SMTPMailer) Send(email Message) error {
	if err := email.parse(); err != nil {
		return err
	}

	msg := mail.NewMsg()
	msg.SetAddrHeader("From", email.From.Address, email.From.Name)
	msg.SetAddrHeader("To", email.To.Address, email.To.Name)
	msg.Subject(email.Subject)
	msg.SetBodyString("text/plain", email.text)
	msg.SetBodyString("text/html", email.html)

	return m.client.DialAndSend(msg)
}