<?php

namespace Yoast\WP\SEO\Services\Importing;

use Yoast\WP\SEO\Actions\Importing\Importing_Action_Interface;

/**
 * Detects if any data from other SEO plugins is available for importing.
 */
class Importable_Detector {

	use Importer_Action_Filter_Trait;

	/**
	 * All known import actions
	 *
	 * @var array|Importing_Action_Interface[]
	 */
	protected $importers;

	/**
	 * Importable_Detector constructor.
	 *
	 * @param Importing_Action_Interface ...$importers All of the known importers.
	 */
	public function __construct( Importing_Action_Interface ...$importers ) {
		$this->importers = $importers;
	}

	/**
	 * Returns the detected importers that have data to work with.
	 *
	 * @param string $plugin The plugin name of the importer.
	 * @param string $type   The type of the importer.
	 *
	 * @return array The detected importers that have data to work with.
	 */
	public function detect( $plugin = null, $type = null ) {
		$detectors = $this->filter_actions( $this->importers, $plugin, $type );

		$detected = [];
		foreach ( $detectors as $detector ) {
			if ( $detector->get_limited_unindexed_count( 1 ) > 0 ) {
				$detected[ $detector->get_plugin() ][] = $detector->get_type();
			}
		}

		return $detected;
	}
}