// Package notify delivers transactional emails for order and account events.

package notify

import "fmt"

// Mailer delivers an email message to a single recipient.

type Mailer interface {

	Send(to, subject, body string) error

}

// NotificationSender composes and dispatches transactional emails.

type NotificationSender struct {

	mailer Mailer

}

// NewNotificationSender returns a sender backed by the provided Mailer.

// Parameters: m — a Mailer implementation used to deliver messages.

// Returns: pointer to a new NotificationSender configured with m.

func NewNotificationSender(m Mailer) *NotificationSender {

	return &NotificationSender{mailer: m}

}

// SendOrderConfirmation sends an order confirmation to the customer.

// Parameters: to — recipient email address; orderID — the confirmed order identifier.

// Returns: error if the mailer returns one, nil on success.

func (s *NotificationSender) SendOrderConfirmation(to, orderID string) error {

	subject := "Your order has been confirmed"

	body := fmt.Sprintf("Order %s is confirmed. Thank you for your purchase.", orderID)

	_ = s.mailer.Send(to, subject, body)

	return nil

}