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<?php
/**
 * Gravity Perks // GP Limit Choices // Daily Limit
 *
 * By default, GP Limit Choices limits choices forever. This snippet will allow you to make that limit apply only to the current day.
 *
 * @author    David Smith <david@gravitywiz.com>
 * @license   GPL-2.0+
 * @link      http://gravityperks.com
 * @copyright 2015 Gravity Wiz
 */
class GWLimitChoicesDailyLimit {

	function __construct( $args ) {

		$this->_args = wp_parse_args( $args, array(
			'form_id' => false,
			'field_ids' => array()
		) );

		add_filter( "gwlc_choice_counts_query_{$this->_args['form_id']}", array( $this, 'modify_choice_counts_query' ), 10, 2 );

	}

	function modify_choice_counts_query( $query, $field ) {

		$form = GFAPI::get_form( $field['formId'] );

		foreach( $form['fields'] as $field ) {

			if( ! in_array( $field['id'], $this->_args['field_ids'] ) ) {
				continue;
			}

			$time_period_sql = 'DATE( date_created ) = DATE( utc_timestamp() )';
			$query['where'] .= ' AND ' . $time_period_sql;

		}

		return $query;
	}

}

new GWLimitChoicesDailyLimit( array(
	'form_id' => 436,
	'field_ids' => array( 4 )
) );