<?php
/**
 * Email Message Data Transfer Object
 *
 * Type-safe container for email data between Newsletter and queue system.
 *
 * @package ROBOTSTXT_SMTP_Newsletter
 * @since 2.2.0
 */

namespace Robotstxt_SMTP_Newsletter;

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

/**
 * Email Message DTO class.
 *
 * Encapsulates email message data for type safety and standardization.
 */
class Email_Message {

	/**
	 * Sender email address.
	 *
	 * @var string
	 */
	public $from;

	/**
	 * Sender display name.
	 *
	 * @var string
	 */
	public $from_name;

	/**
	 * Recipient email address.
	 *
	 * @var string
	 */
	public $to;

	/**
	 * Recipient display name.
	 *
	 * @var string
	 */
	public $to_name;

	/**
	 * Email subject.
	 *
	 * @var string
	 */
	public $subject;

	/**
	 * Email body (HTML).
	 *
	 * @var string
	 */
	public $body;

	/**
	 * Email body (plain text).
	 *
	 * @var string
	 */
	public $body_text;

	/**
	 * Additional headers.
	 *
	 * @var array<string, string>
	 */
	public $headers;

	/**
	 * Newsletter campaign ID.
	 *
	 * @var int|null
	 */
	public $newsletter_id;

	/**
	 * Campaign display name.
	 *
	 * @var string|null
	 */
	public $campaign_name;

	/**
	 * Reply-To email address.
	 *
	 * @var string|null
	 */
	public $reply_to;

	/**
	 * Email provider identifier.
	 *
	 * @var string|null
	 */
	public $provider;

	/**
	 * Create from Newsletter message object.
	 *
	 * Converts TNP_Mailer_Message to our standardized format.
	 *
	 * @param \TNP_Mailer_Message $msg Newsletter message object.
	 *
	 * @return self
	 */
	public static function from_newsletter_message( $msg ) {
		$instance = new self();

		// Basic sender/recipient.
		$instance->from      = $msg->from ?? '';
		$instance->from_name = $msg->from_name ?? '';
		$instance->to        = $msg->to ?? '';
		$instance->to_name   = $msg->to_name ?? '';

		// Subject and body.
		$instance->subject   = $msg->subject ?? '';
		$instance->body      = $msg->body ?? '';
		$instance->body_text = $msg->body_text ?? '';

		// Headers and reply-to.
		$instance->headers  = is_array( $msg->headers ?? null ) ? $msg->headers : array();
		$instance->reply_to = $msg->reply_to ?? null;

		// Campaign identification.
		// Newsletter uses 'id' property for the email ID (not campaign).
		// We'll try to extract campaign info from the message if available.
		$instance->newsletter_id = $msg->id ?? null;
		$instance->campaign_name = $msg->subject ?? __( 'Unnamed Campaign', 'robotstxt-smtp-newsletter' );

		// Detect provider.
		$instance->provider = self::detect_provider();

		return $instance;
	}

	/**
	 * Detect current email provider.
	 *
	 * @return string Provider identifier.
	 */
	private static function detect_provider() {
		if ( ! class_exists( '\Robotstxt_SMTP\Plugin' ) ) {
			return 'unknown';
		}

		$is_ses = \Robotstxt_SMTP\Plugin::is_amazon_ses_integration_active();

		return $is_ses ? 'amazonses' : 'postfix';
	}
}