package mgmailer

import (
	"context"
	"fmt"
	"sync/atomic"
	"time"

	"github.com/mailgun/mailgun-go/v4"
)

type Config struct {
	MailgunDomain string
	MailgunAPIKey string
	SenderEmail   string
	SenderName    string
}

type Mailer struct {
	conf atomic.Pointer[Config]
	mg   atomic.Pointer[mailgun.MailgunImpl]
}

func (m *Mailer) Update(conf Config) {
	m.conf.Store(&conf)
	m.mg.Store(mailgun.NewMailgun(conf.MailgunDomain, conf.MailgunAPIKey))
}

func (m *Mailer) Send(subject, body, to string) error {
	mg := m.mg.Load()
	conf := m.conf.Load()
	message := mailgun.NewMessage(
		fmt.Sprintf("%s <%s>", conf.SenderName, conf.SenderEmail),
		subject,
		body,
		to)

	ctx, cancel := context.WithTimeout(context.Background(), time.Second*10)
	defer cancel()

	_, _, err := mg.Send(ctx, message)
	return err
}