package main

import (
	"crypto/tls"
	"fmt"
	"html/template"
	"net/mail"
	"net/smtp"
	"os"
	"strings"
)

// "Send As" information

func main() {
	var (
		username  = os.Getenv("PLUGIN_USER")
		password  = os.Getenv("PLUGIN_PASSWORD")
		to        = os.Getenv("PLUGIN_TO")
		subject   = os.Getenv("PLUGIN_SUBJECT")
		body      = os.Getenv("PLUGIN_TEXT")
		from_addr = os.Getenv("PLUGIN_FROM")
		from_name = os.Getenv("PLUGIN_FROM_NAME")
	)

	if username == "" || password == "" || to == "" || subject == "" || body == "" {
		panic("'user', 'password', 'to', 'subject', and 'text' are mandatory!")
	}

	if username == "" || password == "" || to == "" || subject == "" || body == "" {
		panic("'user', 'password', 'to', 'subject', and 'text' are mandatory!")
	}

	const gmail = "smtp.gmail.com:587"

	sanitizedBody := template.HTMLEscapeString(body)

	fmt.Println("Authenticateing...")
	auth := smtp.PlainAuth("", username, password, "smtp.gmail.com")
	smtpConnection, err := smtp.Dial(gmail)
	if err != nil {
		panic(err)
	}
	if err := smtpConnection.StartTLS(&tls.Config{ServerName: "smtp.gmail.com"}); err != nil {

		panic(err)
	}
	if err := smtpConnection.Auth(auth); err != nil {
		panic(err)
	}

	from := mail.Address{Name: from_name, Address: from_addr}

	header := make(map[string]string)
	header["From"] = from.String()
	header["To"] = to
	header["Subject"] = subject

	// Convert the header map to a string and attach the body to it
	var message string
	for key, value := range header {
		message += fmt.Sprintf("%s: %s\r\n", key, value)
	}
	message += "\r\n" + sanitizedBody + "\r\n"

	fmt.Println("Senting an email to user")

	rcpts := strings.Split(to, ",")
	err = smtp.SendMail(gmail, auth, from_addr, rcpts, []byte(message))
	if err != nil {
		panic(err)
	}

	smtpConnection.Quit()
	fmt.Println("Done")
}