<?php

class MC4WP_Form_Previewer {
	
	public function add_hooks() {
		add_action( 'parse_request', array( $this, 'listen' ) );
	}

	public function listen() {
		if( empty( $_GET['mc4wp_preview_form'] ) ) {
            return;
        }

        try {
            $form = mc4wp_get_form( $_GET['mc4wp_preview_form'] );
        } catch( Exception $e ) {
            return;
        }  

        show_admin_bar(false);
        add_filter( 'pre_handle_404', '__return_true' );
        remove_all_actions( 'template_redirect' );
        add_action( 'template_redirect', array( $this, 'load_preview' ) );
	}

	public function load_preview() {
		 // clear output, some plugin or hooked code might have thrown errors by now.
        if( ob_get_level() > 0 ) {
            ob_end_clean();
        }

        $form_id = (int) $_GET['mc4wp_preview_form'];
        status_header(200);
        require dirname( __FILE__ ) . '/views/preview.php';
        exit;
	}
}