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<?php
/**
 * Gravity Wiz // Gravity Forms // Total Shortcode
 *
 * Get the total sold or donated per form.
 *
 * @version      1.1
 * @author       David Smith <david@gravitywiz.com>
 * @license      GPL-2.0+
 * @link         http://gravitywiz.com/
 */
class GW_Total_Shortcode {

	public function __construct( $args = array() ) {

		// do version check in the init to make sure if GF is going to be loaded, it is already loaded
		add_action( 'init', array( $this, 'init' ) );

	}

	public function init() {

		// make sure we're running the required minimum version of Gravity Forms
		if ( !property_exists( 'GFCommon', 'version' ) || !version_compare( GFCommon::$version, '1.8', '>=' ) ) {
			return;
		}

		// carry on
		add_filter( 'gform_shortcode_total', array( $this, 'shortcode_total' ), 10, 2 );

	}

	public function shortcode_total( $output, $atts ) {
		global $wpdb;

		$atts = shortcode_atts(
			array(
				'id'     => false,
				'format' => 'currency' // accepted values: false, 'currency', 'comma', 'decimal'
			), $atts
		);

		extract( $atts ); // gives us $id

		$form_ids = array_map( 'intval', array_filter( explode( ',', $id ) ) );

		$query = array(
			'select' => 'SELECT sum( e.payment_amount )',
			'from'   => "FROM {$wpdb->prefix}gf_entry e",
			'where'  => 'WHERE e.status = "active"'
		);

		if ( !empty( $form_ids ) ) {
			$query['where'] .= $wpdb->prepare( ' AND e.form_id IN( %d )', implode( ', ', $form_ids ) );
		}

		$sql   = implode( "\n", $query );
		$value = round( floatval( $wpdb->get_var( $sql ) ), 2 );

		switch ( $format ) {
			case 'comma':
			case 'decimal':
				$thousands = $format == 'decimal' ? '.' : ',';
				$decimals  = $format == 'decimal' ? ',' : '.';
				$output    = number_format( $value, 2, $decimals, $thousands );
				break;
			case 'currency':
				$output = GFCommon::to_money( $value );
				break;
			default:
				$output = $value;
				break;
		}

		return $output;
	}

}

# Configuration

new GW_Total_Shortcode();