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<?php
/**
* Gravity Wiz // Gravity Perks // GP Limit Choices // Shortcodes
* 
* Provides several shortcodes providing the ability to display the number of times a choice has been selected,
* the total number of times a choice can be selected, and the remaining number of times a choice can be selected.
* 
* @version	 1.0
* @author    David Smith <david@gravitywiz.com>
* @license   GPL-2.0+
* @link      http://gravitywiz.com/...
* @copyright 2014 Gravity Wiz
*/
class GPLC_Shortcode {

    private static $instance = null;

    public static function get_instance() {
        if( null == self::$instance )
            self::$instance = new self;
        return self::$instance;
    }

    private function __construct() {

        if( ! class_exists( 'GFForms' ) || ! class_exists( 'GWLimitChoices' ) )
            return;

        add_shortcode( 'gplimitchoices', array( $this, 'do_shortcode' ) );

    }

    public function do_shortcode( $atts, $content = null ) {

        extract( shortcode_atts( array(
            'action'   => false, // supports "limit", "available",
            'form_id'  => false,
            'field_id' => false,
            'choice'   => false
        ), $atts ) );

        if( ! $action )
            $action = 'available';

        $return = '';

        switch( $action ) {
            case 'count':
                $return = $this->get_choice_count( $form_id, $field_id, $choice );
                break;
            case 'available':
                $return = $this->get_choice_available( $form_id, $field_id, $choice );
                break;
            case 'limit':
                $return = $this->get_choice_limit( $form_id, $field_id, $choice );
                break;
        }

        return $return;
    }

    public function get_choice_available( $form_id, $field_id, $value ) {

        $count = $this->get_choice_count( $form_id, $field_id, $value );
        $limit = $this->get_choice_limit( $form_id, $field_id, $value );

        if( $count === false || $limit === false )
            return false;

        $available = $limit - $count;

        return $available >= 0 ? $available : 0;
    }

    public function get_choice_count( $form_id, $field_id, $value ) {

        $choice = $this->get_choice( $form_id, $field_id, $value );
        if( $choice === false || ! isset( $choice['limit'] ) )
            return false;

        $form  = GFAPI::get_form( $form_id );
        $field = GFFormsModel::get_field( $form, $field_id );
        $count = GWLimitChoices::get_choice_count( $value, $field, $form_id );

        return $count;
    }

    public function get_choice_limit( $form_id, $field_id, $value ) {

        $choice = $this->get_choice( $form_id, $field_id, $value );
        if( $choice === false || ! isset( $choice['limit'] ) )
            return false;

        return $choice['limit'];
    }

    public function get_choice( $form_id, $field_id, $value ) {

        $form  = GFAPI::get_form( $form_id );
        $field = GFFormsModel::get_field( $form, $field_id );

        foreach( $field['choices'] as $choice ) {
            if( $choice['value'] == $value )
                return $choice;
        }

        return false;
    }

}

function gplc_shortcode() {
    return GPLC_Shortcode::get_instance();
}

gplc_shortcode();



# Usage

## Shortcodes

// count: number of times this choice has been selected
# [gplimitchoices action="count" form_id="436" field_id="1" choice="The Big Option" /]

// limit: the total number of times this choice can be selected (specified via the UI)
# [gplimitchoices action="limit" form_id="436" field_id="1" choice="The Big Option" /]

// available: the remaining number of times this option can be selected
# [gplimitchoices action="available" form_id="436" field_id="1" choice="The Big Option" /]

// default: defaults to "available" if not "action" is provided
# [gplimitchoices form_id="436" field_id="1" choice="The Big Option" /]

## Functions

// count
# gplc_shortcode()->get_choice_count( $form_id, $field_id, $value );

// limit
# gplc_shortcode()->get_choice_limit( $form_id, $field_id, $value );

// available
# gplc_shortcode()->get_choice_available( $form_id, $field_id, $value );