<?php
/*
 * Vaguely based on code by MK Safi
 * http://msafi.com/fix-yet-another-related-posts-plugin-yarpp-widget-and-add-it-to-the-sidebar/
 */
class YARPP_Widget extends WP_Widget {

	public function __construct() {
		parent::__construct(false, 'Related Posts (YARPP)', array('description' => 'Related Posts and/or Sponsored Content'));
	}

	public function widget($args, $instance) {
        if (!is_singular()) return;

		global $yarpp;
		extract($args);

		/* Compatibility with pre-3.5 settings: */
		if (isset($instance['use_template'])) {
			$instance['template'] = ($instance['use_template']) ? ($instance['template_file']) : false;
        }

		$title = apply_filters('widget_title', $instance['title']);
        $output = $before_widget;
        if (!$instance['template']) {
            $output .= $before_title;
            $output .= $title;
            $output .= $after_title;
        }
        $instance['domain'] = 'widget';
        $output .= $yarpp->display_related(null, $instance, false);
        $output .= $after_widget;
        echo $output;
	}

	public function update($new_instance, $old_instance) {
        $instance = array(
            'template'           => false,
            'title'              => $new_instance['title'],
            'thumbnails_heading' => $new_instance['thumbnails_heading'],
            'use_pro'            => false,
            'pro_dpid'           => null,
            'promote_yarpp'      => false,
        );

		if ($new_instance['use_template'] === 'thumbnails')   $instance['template'] = 'thumbnails';
        else if ($new_instance['use_template'] === 'custom' ) $instance['template'] = $new_instance['template_file'];
		
		return $instance;
	}

	public function form($instance) {
		global $yarpp;
        $id = rtrim($this->get_field_id(null), '-');
		$instance = wp_parse_args(
            $instance,
            array(
                'title'                 => 'Related Posts (YARPP)',
                'thumbnails_heading'    => $yarpp->get_option('thumbnails_heading'),
                'template'              => false,
                'use_pro'               => false,
                'pro_dpid'              => null,
                'promote_yarpp'         => false,
            )
        );
	
		/* TODO: Deprecate
		 * Compatibility with pre-3.5 settings
		 */
		if (isset($instance['use_template'])) $instance['template'] = $instance['template_file'];
	
		$choice = ($instance['template']) ? (($instance['template'] === 'thumbnails') ? 'thumbnails' : 'custom') : 'builtin';

		/* Check if YARPP templates are installed */
		$templates = $yarpp->get_templates();

		if (!$yarpp->diagnostic_custom_templates() && $choice === 'custom') $choice = 'builtin';

		include(YARPP_DIR.'/includes/phtmls/yarpp_widget_form.phtml');
	}
}

/**
 * @since 2.0 Add as a widget
 */
function yarpp_widget_init() {
    register_widget('YARPP_Widget');
}

add_action('widgets_init', 'yarpp_widget_init');