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<?php

/**
 * Handler for the types_query_groups filter.
 *
 * @since 2.2
 */
class Types_Api_Handler_Query_Groups implements Types_Api_Handler_Interface {

public function __construct() { }

/**
	 * @param array $arguments Original action/filter arguments.
	 *
	 * @return mixed
	 */
	function process_call( $arguments ) {

$query = wpcf_getarr( $arguments, 1, array() );

$domain = wpcf_getarr( $query, 'domain', 'all' );
		unset( $query['domain'] );

// Sanitize input
		if ( ! is_string( $domain )  || ! is_array( $query ) ) {
			return null;
		}

if ( 'all' == $domain ) {

// Separate query for each available domain.
			$groups_by_domain = array();
			$domains = Types_Field_Utils::get_domains();
			foreach( $domains as $field_domain ) {
				$groups_by_domain[ $field_domain ] = $this->query_specific_domain( $field_domain, $query );
			}

return $groups_by_domain;

} else {
			return $this->query_specific_domain( $domain, $query );
		}

}

/**
	 * Query field groups from a single domain.
	 *
	 * @param string $domain One of the valid field domains. Legacy "meta type" values will be also accepted.
	 * @param array $query Query arguments for Types_Field_Group_Factory::query_groups().
	 *
	 * @return null|Types_Field_Group[] Array of field groups or null on error.
	 * @since m2m
	 */
	private function query_specific_domain( $domain, $query ) {

// Make sure we have a valid domain string.
		$valid_domains = Types_Field_Utils::get_domains();
		if( !in_array( $domain, $valid_domains ) ) {
			$domain = Types_Field_Utils::legacy_meta_type_to_domain( $domain );
		}

// Pass the group query to the proper factory class.
		try {
			$group_factory = Types_Field_Group_Factory::get_factory_by_domain( $domain );
			$groups = $group_factory->query_groups( $query );
		} catch( Exception $e ) {
			// We don't care, it's a failure.
			return null;
		}

return $groups;

}