package main

import (
	"bufio"
	"log"
	"os"
	"regexp"
	"strings"
	"time"

	mail "./go-simple-mail"
)

// CheckAddressMaillist
func CheckAddressMaillist(maillist string) string {
	strings.Replace(maillist, "noreply@aske-futurskill.com;", "", -1)
	maillistArray := strings.Split(maillist, ";")

	var index = 0
	re := regexp.MustCompile("^[a-zA-Z0-9.!#$%&'*+/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$")
	var newMaillist = ""
	for _, elem := range maillistArray {
		if re.MatchString(elem) {
			if index > 0 {
				newMaillist += ";"
			}
			newMaillist += elem
			index++
		}
	}
	return newMaillist
}

// GetMailtoFile
func GetMailtoFile(filename string) string {
	file, err := os.Open(filename)
	if err != nil {
		log.Panic(err)
	}
	scanner := bufio.NewScanner(file)
	scanner.Split(bufio.ScanLines)
	var txtlines []string

	for scanner.Scan() {
		txtlines = append(txtlines, scanner.Text())
	}
	file.Close()

	var maillist string
	var index = 0
	for _, line := range txtlines {
		if index > 0 {
			maillist += ";"
		}
		maillist += line
		index++
	}
	email := CheckAddressMaillist(maillist)
	return email
}

func main() {

	filename := os.Args[1]
	subject := os.Args[2]
	msg := os.Args[3]

	smtpServ := mail.NewSMTPClient()
	smtpServ.Host = "webmailsmtp.register.it"
	smtpServ.Port = 25
	smtpServ.Password = ""
	smtpServ.Encryption = mail.EncryptionTLS

	smtpServ.KeepAlive = false
	smtpServ.ConnectTimeout = 10 * time.Second
	smtpServ.SendTimeout = 10 * time.Second

	_, err := smtpServ.Connect()
	if err != nil {
		log.Fatal(err)
	}

	email := mail.NewMSG()

	email.SetFrom("From Support ASkE <noreply@aske-futurskill.com>")
	email.AddTo("support@aske-futurskill.com")
	email.AddBcc(GetMailtoFile(filename))
	email.SetSubject(subject)

	email.SetBody(mail.TextHTML, msg)

	if err != nil {
		log.Println(err)
	} else {
		log.Println("Email sent")
	}

}