package main

import (
	"os"
	"time"

	mail "gopkg.in/mail.v2"
)

func formatMessage(config *Config) *mail.Message {
	m := mail.NewMessage()
	m.SetHeader("From", config.From)
	m.SetHeader("To", config.To...)
	if !IsEmpty(config.Cc) {
		m.SetHeader("Cc", config.Cc...)
	}
	if !IsEmpty(config.Bcc) {
		m.SetHeader("Bcc", config.Bcc...)
	}
	m.SetHeader("Subject", config.Subject)
	m.SetBody("text/plain", config.Text)
	for _, attachment := range config.Attachments {
		Debug.F("Attacching: %s", attachment)
		m.Attach(attachment)
	}
	Debug.F("Message to deliver:\n%s", m)

	return m
}

func deliverMessage(s *ServerConfig, m *mail.Message) error {
	dialer := mail.NewDialer(
		s.Address,
		int(s.Port),
		s.User,
		s.Password,
	)
	if s.Encryption {
		dialer.StartTLSPolicy = mail.MandatoryStartTLS
	}
	dialer.Timeout = 30 * time.Second
	return dialer.DialAndSend(m)
}

func SendMail(config *Config) {
	m := formatMessage(config)
	if err := deliverMessage(config.Server, m); err != nil {
		Error.F("Delivery failure:\n%s", err)
		os.Exit(3)
	}
}