<?php

declare(strict_types=1);

namespace FlexatechTableReservations\Notifications;

use FlexatechTableReservations\Reservations\Repository;
use FlexatechTableReservations\Reservations\Reservation;
use FlexatechTableReservations\Support\Settings;
use FlexatechTableReservations\Support\SingletonTrait;

defined( 'ABSPATH' ) || exit;

/**
 * Posts reservation events to a configured webhook URL (settings.webhook_url)
 * so external systems (Zapier, n8n, a CRM...) can react. Fire-and-forget.
 *
 * The JSON is { event, reservation } with the reservation as it is now. A
 * status change adds `previous_status`, a move adds `previous` with the old
 * date and time.
 */
final class Webhook {

	use SingletonTrait;

	public function register(): void {
		add_action( 'fxtr_reservation_created', [ $this, 'on_created' ], 20 );
		add_action( 'fxtr_reservation_status_changed', [ $this, 'on_status_changed' ], 20, 3 );
		add_action( 'fxtr_reservation_moved', [ $this, 'on_moved' ], 20, 3 );
	}

	public function on_created( int $id ): void {
		$reservation = ( new Repository() )->find( $id );
		if ( null !== $reservation ) {
			$this->post( 'reservation.created', $reservation );
		}
	}

	// phpcs:ignore Generic.CodeAnalysis.UnusedFunctionParameter.FoundBeforeLastUsed -- the hook passes it.
	public function on_status_changed( int $id, mixed $reservation, string $old_status = '' ): void {
		if ( $reservation instanceof Reservation ) {
			$this->post( 'reservation.status_changed', $reservation, [ 'previous_status' => $old_status ] );
		}
	}

	// phpcs:ignore Generic.CodeAnalysis.UnusedFunctionParameter.FoundBeforeLastUsed -- the hook passes it.
	public function on_moved( int $id, mixed $reservation, mixed $before = null ): void {
		if ( ! $reservation instanceof Reservation ) {
			return;
		}

		$extra = $before instanceof Reservation ? [
			'previous' => [
				'date' => $before->date,
				'time' => $before->time,
			],
		] : [];
		$this->post( 'reservation.moved', $reservation, $extra );
	}

	/**
	 * @param array<string,mixed> $extra
	 */
	private function post( string $event, Reservation $reservation, array $extra = [] ): void {
		$url = (string) Settings::get( 'webhook_url', '' );
		if ( '' === $url ) {
			return;
		}

		$payload = [
			'event'       => $event,
			'reservation' => $reservation->to_array(),
		] + $extra;

		wp_safe_remote_post(
			$url,
			[
				'timeout'  => 5,
				'blocking' => false,
				'headers'  => [ 'Content-Type' => 'application/json' ],
				'body'     => (string) wp_json_encode( $payload ),
			]
		);
	}
}