package mail

import (
	"crypto/tls"
	"fmt"
	"net/mail"
	"net/smtp"

	"git.acooldomain.co/server-manager/backend-kubernetes-go/models"
)

const EMAIL_SERVER_ENV_VAR = "EMAIL_SERVER"
const FROM_EMAIL_ENV_VAR = "FROM_EMAIL"

var auth *smtp.Auth
var mailConfig *models.EmailConfig

func InitializeClient(config models.EmailConfig) error {
	simpleAuth := smtp.PlainAuth("", config.Username, config.Password, config.Server)
	auth = &simpleAuth
	mailConfig = &config
	return nil
}

func SendMail(
	recipient string,
	subject string,
	content string,
) error {
	if auth == nil {
		return fmt.Errorf("mail not initialized")
	}
	if mailConfig == nil {
		return fmt.Errorf("mail not initialized")
	}
	from := mail.Address{Name: "", Address: mailConfig.FromEmail}
	to := mail.Address{Name: "", Address: recipient}

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

	message := ""
	for k, v := range headers {
		message += fmt.Sprintf("%s: %s\r\n", k, v)
	}
	message += "\r\n" + content

	conn, err := tls.Dial("tcp", mailConfig.Server+":465", &tls.Config{ServerName: mailConfig.Server})
	if err != nil {
		return err
	}

	client, err := smtp.NewClient(conn, mailConfig.Server)
	if err != nil {
		return err
	}

	if err = client.Auth(*auth); err != nil {
		return err
	}

	if err = client.Mail(mailConfig.FromEmail); err != nil {
		return err
	}

	if err = client.Rcpt(recipient); err != nil {
		return err
	}

	writer, err := client.Data()
	if err != nil {
		return err
	}

	_, err = writer.Write([]byte(message))
	if err != nil {
		return err
	}

	if err = writer.Close(); err != nil {
		return err
	}

	return client.Quit()
}