package mailer

import "fmt"

/*
	use AddTemplate and AddKeyedTemplate to make repeatable emails
*/

// Template creates a repeatable template of your subject/body
func (m Mailer) AddTemplate(name string, subject string, body string) {
	m.Send[name] = func(user string) {
		m.sendNoKey(user, subject, body)
	}
}

// TemplateKeyed returns a function that sends keyed emails
func (m Mailer) AddKeyedTemplate(name, subject, explanation, baseurl, notyou string) {
	m.SendKeyed[name] = func(username string, code string) {
		m.sendKeyed(username, subject, explanation, baseurl, code, notyou)
	}
}

// pasting body together
func (m Mailer) sendKeyed(username string, subject string, explanation string, baseurl string, code string, notyou string) {
	fmt.Println("send keyed: " + subject + " " + code + " to " + username)
	message := explanation + "\n" +
		baseurl + code + "\n\n" +
		notyou + "\n\n"
	msg := m.assemble(username, subject, message)
	m.internal_mail(username, msg)
}

func (m Mailer) sendNoKey(username string, subject string, body string) {
	message := body + "\n\n"
	msg := m.assemble(username, subject, message)
	m.internal_mail(username, msg)
}

// asemble adds the unsubscribe codes and footer to an email
func (m Mailer) assemble(to string, subj string, message string) []byte {
	code := m.UnsubscribeCodeFn(to)
	msg := []byte("To: " + to + "\r\n" +
		"From: " + m.From + "\r\n" +
		"Subject: " + subj + "\r\n" +
		"List-Unsubscribe post: List-Unsubscribe=One click; \r\n" +
		"List-Unsubscribe: <" + m.UnsubscribeUrl + code + ">\r\n" +
		"\r\n" +
		message +
		m.Footer +
		"If you want to unsubscribe, reply to this email or use this link:\n\n" +
		m.UnsubscribeUrl + code + "\n\n" +
		"\r\n" + "\r\n",
	)
	return msg
}