<?php
namespace Consiva\Consent\Integrations\Forms;

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

/**
 * The form adapters this site can use (Plugin §10.1).
 */
final class Registry {

	/** Most forms per form plugin listed on the Forms screen. */
	const MAX_FORMS = 2000;

	/**
	 * @var AdapterInterface[]|null
	 */
	private static $adapters = null;

	/**
	 * Registers hooks for every available adapter. Runs on init, once form plugins have loaded.
	 *
	 * @return void
	 */
	public function register() {
		add_action(
			'init',
			static function () {
				foreach ( self::available() as $adapter ) {
					$adapter->register_hooks();
				}
			},
			20
		);
	}

	/**
	 * Adapters whose form plugin is active.
	 *
	 * @return AdapterInterface[]
	 */
	public static function available() {
		return array_values(
			array_filter(
				self::all(),
				static function ( $adapter ) {
					return $adapter->is_available();
				}
			)
		);
	}

	/**
	 * Every known adapter, including ones added by other code.
	 *
	 * @return AdapterInterface[]
	 */
	public static function all() {
		if ( null === self::$adapters ) {
			/**
			 * Form adapters. Add an AdapterInterface instance to support another form plugin.
			 *
			 * @param AdapterInterface[] $adapters Adapters.
			 */
			$adapters       = apply_filters( 'consiva_consent_form_adapters', array( new ContactForm7(), new WPForms() ) );
			self::$adapters = array_values(
				array_filter(
					(array) $adapters,
					static function ( $adapter ) {
						return $adapter instanceof AdapterInterface;
					}
				)
			);
		}
		return self::$adapters;
	}

	/**
	 * @param string $id Adapter ID.
	 * @return AdapterInterface|null
	 */
	public static function get( $id ) {
		foreach ( self::all() as $adapter ) {
			if ( $adapter->id() === $id ) {
				return $adapter;
			}
		}
		return null;
	}

	/**
	 * Published forms stored as a post type, by title. Loaded 100 at a time, up to MAX_FORMS: admin
	 * screens only, never on a front-end page.
	 *
	 * @param string $post_type Post type.
	 * @return array<int,array{id:int,title:string}>
	 */
	public static function published_forms( $post_type ) {
		$out   = array();
		$pages = (int) ( self::MAX_FORMS / 100 );
		for ( $page = 1; $page <= $pages; $page++ ) {
			$posts = get_posts(
				array(
					'post_type'              => $post_type,
					'post_status'            => 'publish',
					'posts_per_page'         => 100,
					'paged'                  => $page,
					'orderby'                => 'title',
					'order'                  => 'ASC',
					'no_found_rows'          => true,
					'update_post_meta_cache' => false,
					'update_post_term_cache' => false,
				)
			);
			foreach ( $posts as $post ) {
				$out[] = array(
					'id'    => (int) $post->ID,
					'title' => $post->post_title,
				);
			}
			if ( count( $posts ) < 100 ) {
				break;
			}
		}
		return $out;
	}
}