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<?php
/**
 * Gravity Perks // GP Limit Choices // Limit Per User
 *
 * By default, GP Limit Choices limits apply to all users. Use this snippet to 
 * apply limits per user.
 *
 * @author    David Smith <david@gravitywiz.com>
 * @license   GPL-2.0+
 * @link      http://gravityperks.com
 * @copyright 2015 Gravity Wiz
 */
class GWLimitChoicesPerUser {

    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 ) {
	    global $wpdb;

        if( ! is_user_logged_in() ) {
            return $query;
        }

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

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

            if( empty( $this->_args['field_ids'] ) || in_array( $field['id'], $this->_args['field_ids'] ) ) {
	            $per_user_sql    = $wpdb->prepare( 'created_by = %d', get_current_user_id() );
	            $query['where'] .= ' AND ' . $per_user_sql;
            }

        }

        return $query;
    }

}

new GWLimitChoicesPerUser( array(
    'form_id' => 436,
    'field_ids' => array( 7 )
) );