package mail

import (
	"bytes"
	"crypto/tls"
	"text/template"

	"git.andreafazzi.eu/andrea/oef/config"
	"gopkg.in/gomail.v2"
)

type Subscriber interface {
	NameForMail() string
	Username() string
	Password() string
	To() string
	Cc() string
}

type MailSender struct {
	BodyTemplate string

	mailTpl *template.Template
	config  *config.ConfigT
}

func NewMailSender(config *config.ConfigT, mailBody string) *MailSender {
	ms := new(MailSender)

	ms.config = config
	ms.mailTpl = template.Must(template.New("subscription_mail").Parse(mailBody))

	return ms
}

func (ms *MailSender) SendSubscriptionMail(rcv Subscriber) error {
	var body bytes.Buffer

	m := gomail.NewMessage()
	m.SetHeader("Subject", ms.config.Smtp.Subject)
	m.SetHeader("From", ms.config.Smtp.From)
	m.SetHeader("To", rcv.To())
	m.SetHeader("Cc", rcv.Cc())
	m.SetHeader("Bcc", ms.config.Smtp.Bcc)

	err := ms.mailTpl.Execute(&body, rcv)
	if err != nil {
		return err
	}

	m.SetBody("text/plain", body.String())

	dialer := gomail.NewDialer(
		ms.config.Smtp.Host,
		ms.config.Smtp.Port,
		ms.config.Smtp.Username,
		ms.config.Smtp.Password,
	)
	dialer.TLSConfig = &tls.Config{InsecureSkipVerify: true}

	if err := dialer.DialAndSend(m); err != nil {
		return err
	}

	return nil

}