package utils

import (
	"bytes"
	"fmt"
	"html/template"
	"log"
	"net/smtp"
	"os"
)

const (
	format = "From: %v\r\n" +
		"To: %v\r\n" +
		"Subject: %v\r\n" +
		"Content-Type: text/html; charset=UTF-8\r\n" +
		"MIME-version: 1.0;\r\n\r\n" +
		"%v\r\n"
)

var mailAuth = smtp.PlainAuth("", os.Getenv("MAIL_USERNAME"), os.Getenv("MAIL_PASSWORD"), os.Getenv("MAIL_HOST"))

func SendMail(to string, subject string, body string) {
	msg := []byte(fmt.Sprintf(format, os.Getenv("MAIL_USERNAME"), to, subject, body))
	err := smtp.SendMail(os.Getenv("MAIL_HOST")+":587", mailAuth, os.Getenv("MAIL_USERNAME"), []string{to}, msg)
	if err != nil {
		log.Println(err)
	}
}

func SendMailTemplate(to string, subject string, name string, data interface{}) {
	wd, err := os.Getwd()
	if err != nil {
		log.Println(err)
	}
	t, err := template.ParseFiles(wd + `/mail_templates/` + name)
	if err != nil {
		log.Println(err)
	}
	buf := new(bytes.Buffer)
	if err := t.Execute(buf, data); err != nil {
		log.Println(err)
	}
	body := buf.String()
	SendMail(to, subject, body)
}