package providers

import (
	"crypto/tls"

	"git.wenlab.co/joe/beaconfire"
	gomail "gopkg.in/gomail.v2"
)

const SMTP_NAME = "smtp"

type OptionsSmtp struct {
	Host               string
	Port               int
	InsecureSkipVerify bool
	Username           string
	Password           string
	To                 []string
}

type smtp struct {
	opt *OptionsSmtp
}

var _ beaconfire.BeaconFire = &smtp{}

func NewSmtp(opt *OptionsSmtp) *smtp {
	return &smtp{
		opt: opt,
	}
}

func (c *smtp) Name() string {
	return SMTP_NAME
}

func (c *smtp) Send(bp *beaconfire.BeaconParam) error {
	if len(c.opt.To) <= 0 {
		return beaconfire.ErrNoReceiver
	}

	mail := gomail.NewMessage()
	mail.SetHeader("From", c.opt.Username)
	mail.SetHeader("To", c.opt.To...)
	mail.SetHeader("Subject", bp.Title)
	inHtml := true // format == "html"
	content := bp.FormatHTML()
	if inHtml {
		mail.SetBody("text/html", content)
	} else {
		mail.SetBody("text/plain", bp.Content)
	}

	var d *gomail.Dialer
	if c.opt.Username != "" && c.opt.Password != "" {
		d = gomail.NewDialer(c.opt.Host, c.opt.Port, c.opt.Username, c.opt.Password)
	} else {
		d = &gomail.Dialer{Host: c.opt.Host, Port: c.opt.Port}
	}
	if c.opt.InsecureSkipVerify {
		d.TLSConfig = &tls.Config{InsecureSkipVerify: true}
	}
	return d.DialAndSend(mail)
}