<?php
/**
 * Email queueing.
 *
 * @package HostKhata
 */

namespace HostKhata\Domain\Email;

defined( 'ABSPATH' ) || exit;

use HostKhata\Database\Repositories\EmailRepository;
use HostKhata\Settings\Settings;

/**
 * Puts emails on the queue. Nothing is sent here; {@see QueueRunner} sends the
 * queue in small batches so a slow mail server never slows a page down.
 *
 * @since 0.1.0
 */
final class Mailer {

	/**
	 * Templates.
	 *
	 * @var EmailTemplates
	 */
	private $templates;

	/**
	 * Renderer.
	 *
	 * @var EmailRenderer
	 */
	private $renderer;

	/**
	 * Queue.
	 *
	 * @var EmailRepository
	 */
	private $emails;

	/**
	 * Settings.
	 *
	 * @var Settings
	 */
	private $settings;

	/**
	 * Constructor.
	 *
	 * @param EmailTemplates  $templates Templates.
	 * @param EmailRenderer   $renderer  Renderer.
	 * @param EmailRepository $emails    Queue.
	 * @param Settings        $settings  Settings.
	 */
	public function __construct( EmailTemplates $templates, EmailRenderer $renderer, EmailRepository $emails, Settings $settings ) {
		$this->templates = $templates;
		$this->renderer  = $renderer;
		$this->emails    = $emails;
		$this->settings  = $settings;
	}

	/**
	 * Renders a template and queues it for one recipient.
	 *
	 * @since 0.1.0
	 *
	 * @param string                $key          Template key.
	 * @param string                $to_email     Recipient address.
	 * @param string                $to_name      Recipient name.
	 * @param array<string, scalar> $vars         Merge tag values.
	 * @param string                $related_type Related object type, for the log.
	 * @param int                   $related_id   Related object id.
	 * @return int Queue id, or 0 when nothing was queued (template off, bad address, or failure).
	 */
	public function queue( string $key, string $to_email, string $to_name, array $vars, string $related_type = '', int $related_id = 0 ): int {
		$template = $this->templates->get( $key );

		if ( null === $template || ! $template['enabled'] || ! is_email( $to_email ) ) {
			return 0;
		}

		$rendered = $this->renderer->render( $key, $vars );

		if ( null === $rendered ) {
			return 0;
		}

		$id = $this->emails->enqueue(
			array(
				'to_email'     => $to_email,
				'to_name'      => $to_name,
				'subject'      => $rendered['subject'],
				'body_html'    => $rendered['html'],
				'body_text'    => $rendered['text'],
				'template_key' => $key,
				'related_type' => $related_type,
				'related_id'   => $related_id,
			)
		);

		/**
		 * Fires after an email was queued.
		 *
		 * @since 0.1.0
		 *
		 * @param int    $id  Queue id.
		 * @param string $key Template key.
		 */
		do_action( 'hostkhata_email_queued', $id, $key );

		return $id;
	}

	/**
	 * Queues a copy for the admin address from the settings.
	 *
	 * @since 0.1.0
	 *
	 * @param string                $key          Template key.
	 * @param array<string, scalar> $vars         Merge tag values.
	 * @param string                $related_type Related object type.
	 * @param int                   $related_id   Related object id.
	 * @return int Queue id, or 0.
	 */
	public function queue_to_admin( string $key, array $vars, string $related_type = '', int $related_id = 0 ): int {
		return $this->queue( $key, (string) $this->settings->get( 'email_admin_recipient' ), '', $vars, $related_type, $related_id );
	}
}