<?php


class td_demo_base {


	/**
	 * Checks if one of the needles from $needle_array is found in the $haystack
	 * @param $haystack
	 * @param $needle_array
	 *
	 * @return bool
	 */
	protected static function multi_instring($haystack, $needle_array) {
		foreach ($needle_array as $needle) {
			if (strpos($haystack, $needle) !== false) {
				return $needle;
			}
		}

		return false;
	}


	/**
	 * If one of the $requiered_keys is missing from the $received_array we will kill the execution
	 * @param $class - the calling __CLASS__
	 * @param $function - the calling __FUNCTION__
	 * @param $received_array - the array of parameter_key => 'value' received from the caller
	 * @param $requiered_keys - the expected array of parameter_key => 'error_string'
	 */
	protected static function check_params($class, $function, $received_array, $requiered_keys) {
		foreach ($requiered_keys as $requiered_key => $requiered_msg) {
			if (empty($received_array[$requiered_key])) {
				self::kill($class, $function, $requiered_key . ' - ' . $requiered_msg, $received_array);
			}
		}
	}


	/**
	 * kill the execution and show an error message
	 * @param $class
	 * @param $function
	 * @param $msg
	 * @param string $additional_info
	 */
	protected static function kill($class, $function, $msg, $additional_info = '') {
		echo PHP_EOL . 'ERROR - '. $class . '::' . $function . ' - ' . $msg;

		if (!empty($additional_info)) {
			if (is_array($additional_info)) {
				echo PHP_EOL . 'More info:' . PHP_EOL;
				foreach ($additional_info as $key => $value) {
					echo $key . ' - ' . $value . PHP_EOL;
				}
			}
		}

		die;
	}
}


/**
 * Class td_demo_history - saves and restores a history point for our demos.
 */
class td_demo_history extends td_demo_base {
    private $td_demo_history = array();

    /**
     * read the current history
     */
    function __construct() {
        $this->td_demo_history = get_option(TD_THEME_NAME . '_demo_history');
    }


	/**
	 * saves one demo history ONLY. If we already have one saved, it will do nothing
	 */
    function save_all() {

	    // do not save another demo history if we already have one
        if (isset($this->td_demo_history['demo_settings_date'])) {
            return;
        }

        $local_td_demo_history = array();

        $local_td_demo_history['page_on_front'] = get_option('page_on_front');
        $local_td_demo_history['show_on_front'] = get_option('show_on_front');
        $local_td_demo_history['nav_menu_locations'] = get_theme_mod('nav_menu_locations');

        $sidebar_widgets = get_option('sidebars_widgets');
        $local_td_demo_history['sidebars_widgets'] = $sidebar_widgets;

        $used_widgets = $this->get_used_widgets($sidebar_widgets);


        if (is_array($used_widgets)) {
            foreach ($used_widgets as $used_widget) {
                $local_td_demo_history['used_widgets'][$used_widget] = get_option('widget_' . $used_widget);
            }
        }

        $local_td_demo_history['theme_options'] = get_option(TD_THEME_OPTIONS_NAME);
        $local_td_demo_history['td_social_networks'] = get_option('td_social_networks');
        $local_td_demo_history['demo_settings_date'] = time();
        update_option(TD_THEME_NAME . '_demo_history', $local_td_demo_history);
    }


	/**
	 * Restores a demo history point. After the restore, the saved state is deleted from the database
	 */
    function restore_all() {
        update_option('page_on_front', $this->td_demo_history['page_on_front']);
        update_option('show_on_front',  $this->td_demo_history['show_on_front']);
        set_theme_mod('nav_menu_locations', $this->td_demo_history['nav_menu_locations']);
        update_option('sidebars_widgets', $this->td_demo_history['sidebars_widgets']);

        if (isset($this->td_demo_history['used_widgets']) and is_array($this->td_demo_history['used_widgets'])) {
            foreach ($this->td_demo_history['used_widgets'] as $used_widget => $used_widget_value) {
                update_option('widget_' . $used_widget, $used_widget_value);
            }
        }


	    $td_options = &td_options::get_all_by_ref();

		// put the old theme settings back
	    $td_options = $this->td_demo_history['theme_options'];

	    td_options::schedule_save();

	    //update_option(TD_THEME_OPTIONS_NAME, td_global::$td_options);

	    // ?
        update_option('td_social_networks', $this->td_demo_history['td_social_networks']);

        // delete the demo history
        delete_option(TD_THEME_NAME . '_demo_history');
    }


	/**
	 * returns the widget names used on each sidebar .... not 100% sure
	 * @param $sidebar_widgets_option
	 * @return array
	 */
    private function get_used_widgets($sidebar_widgets_option) {
        $used_widgets = array();
        if ( is_array($sidebar_widgets_option) ) {
            foreach ( $sidebar_widgets_option as $sidebar => $widgets ) {
                if ( is_array($widgets) ) {
                    foreach ( $widgets as $widget ) {
                        $used_widgets[]= $this->_get_widget_id_base($widget);
                    }
                }
            }
        }

        return array_unique($used_widgets);
    }

    private function _get_widget_id_base($id) {
        return preg_replace( '/-[0-9]+$/', '', $id );
    }
}






/**
 * Class td_demo_state - keeps the demo state. What demo is installed and how it's installed (full or no_content). We have a similar function in
 * @see td_util::get_loaded_demo_id for the front end
 */
class td_demo_state extends td_demo_base {


	/**
	 * updates the current installed demo state
	 * @param $demo_id string - the demo id that is installed
	 * @param $demo_install_type string "empty"|full|no_content  (full - a full install, no_content - a settings only install)
	 */
    static function update_state($demo_id, $demo_install_type) {
        $new_state = array(
            'demo_id' => $demo_id,
            'demo_install_type' => $demo_install_type
        );
        update_option(TD_THEME_NAME . '_demo_state', $new_state);
    }



    /**
     * @return bool|array
     *  false - if there is no demo installed
     *  array - array(
	                    'demo_id' => '',
	                    'demo_install_type' => ''    "empty"|full|no_content
                    );
     */
    static function get_installed_demo() {
        $demo_state = get_option(TD_THEME_NAME . '_demo_state');
        if (isset($demo_state['demo_install_type']) and $demo_state['demo_install_type'] != '') {
            return $demo_state;
        }
        return false;
    }
}






/**
 * Class td_demo_misc - misc stuff for demos. All the settings form here are removed via the td_demo_history when the theme settings are loaded back.
 */
class td_demo_misc extends td_demo_base {

    /**
     * updates the logo of the site, will be rollback via the td_demo_history when the theme settings are loaded back
     * @param $logo_params array
     */
    static function update_logo($logo_params) {

        if(empty($logo_params['normal'])) {
            td_util::update_option('tds_logo_upload', '');
        } else {
            td_util::update_option('tds_logo_upload', td_demo_media::get_image_url_by_td_id($logo_params['normal']));
        }

        if (empty($logo_params['retina'])) {
            td_util::update_option('tds_logo_upload_r', '');
        } else {
            td_util::update_option('tds_logo_upload_r', td_demo_media::get_image_url_by_td_id($logo_params['retina']));
        }

        if (empty($logo_params['mobile'])) {
            td_util::update_option('tds_logo_menu_upload', '');
        } else {
            td_util::update_option('tds_logo_menu_upload', td_demo_media::get_image_url_by_td_id($logo_params['mobile']));
        }
    }


	/**
	 * Adds the social icons to the panel.
	 * @param $social_icons
	 */
    static function add_social_buttons($social_icons) {
        td_util::update_option('td_social_networks', $social_icons);
    }


	/**
	 * remove all the ads from the theme options. Must be called before adding custom ads
	 */
    static function clear_all_ads() {
        td_util::update_option('td_ads', '');
    }


	/**
	 * ads an ad image via a td_pic_id to an ad spot
	 * @param $ad_spot_name - the adspot id that you want to use. You should get this from the panel or other demos
	 * @param $td_image_id
	 */
    static function add_ad_image($ad_spot_name, $td_image_id) {
        $td_ad_spots = td_util::get_option('td_ads');
        $new_ad_spot['ad_code']= '<div class="td-all-devices"><a href="#"><img src="' . td_demo_media::get_image_url_by_td_id($td_image_id) . '"/></a></div>';
        $new_ad_spot['current_ad_type']= 'other';
        $td_ad_spots[strtolower($ad_spot_name)] = $new_ad_spot;
        td_util::update_option('td_ads', $td_ad_spots);
    }




    static function update_background($td_image_id, $stretch = true) {
        if ($td_image_id == '') {
            td_util::update_option('tds_site_background_image', '');
        }
        td_util::update_option('tds_site_background_image', td_demo_media::get_image_url_by_td_id($td_image_id));

        if ($stretch === true) {
            td_util::update_option('tds_stretch_background', 'yes');
        }
    }


    static function update_background_footer($td_image_id) {
        if ($td_image_id == '') {
            td_util::update_option('tds_footer_background_image', '');
        }
        td_util::update_option('tds_footer_background_image', td_demo_media::get_image_url_by_td_id($td_image_id));
    }


    static function update_background_mobile($td_image_id) {
        if ($td_image_id == '') {
            td_util::update_option('tds_mobile_background_image', '');
        }
        td_util::update_option('tds_mobile_background_image', td_demo_media::get_image_url_by_td_id($td_image_id));
    }


    /**
     * updates the text form the footer
     * @param $new_text
     */
    static function update_footer_text($new_text) {
        td_util::update_option('tds_footer_text', $new_text);
    }


    /**
     * updates the footer logo, this one can also clear the logo
     * @param $logo_params
     */
    static function update_footer_logo($logo_params) {
        if (empty($logo_params['normal'])) {
            td_util::update_option('tds_footer_logo_upload', '');
        } else {
            td_util::update_option('tds_footer_logo_upload', td_demo_media::get_image_url_by_td_id($logo_params['normal']));
        }

        if (empty($logo_params['retina'])) {
            td_util::update_option('tds_footer_retina_logo_upload', '');
        } else {
            td_util::update_option('tds_footer_retina_logo_upload', td_demo_media::get_image_url_by_td_id($logo_params['retina']));
        }
    }
}






class td_demo_category extends td_demo_base {


    static function add_category($params_array) {

    	// it's probably safe to also schedule a save here
	    $td_options = &td_options::get_all_by_ref();


		self::check_params(__CLASS__, __FUNCTION__, $params_array, array(
		    'category_name' => 'Param is requiered!',
		));


	    if (empty($params_array['parent_id'])) {
		    $new_cat_id = wp_create_category($params_array['category_name']);
	    } else {
		    $new_cat_id = wp_create_category($params_array['category_name'], $params_array['parent_id']);
	    }



        //update category descriptions
        if(!empty($params_array['description'])) {
            wp_update_term($new_cat_id, 'category', array(
                'description' => $params_array['description']
            ));
        }


        // update the category top post style
        if (!empty($params_array['top_posts_style'])) {
	        $td_options['category_options'][$new_cat_id]['tdc_category_top_posts_style'] = $params_array['top_posts_style'];
        }


        // update the category top post grid style
        if (!empty($params_array['tdc_category_td_grid_style'])) {
	        $td_options['category_options'][$new_cat_id]['tdc_category_td_grid_style'] = $params_array['tdc_category_td_grid_style'];
        }

        if (!empty($params_array['tdc_color'])) {
	        $td_options['category_options'][$new_cat_id]['tdc_color'] = $params_array['tdc_color'];
        }


        // update the category template
        if (!empty($params_array['category_template'])) {
	        $td_options['category_options'][$new_cat_id]['tdc_category_template'] = $params_array['category_template'];
        }


        // update the background if needed
        if (!empty($params_array['background_td_pic_id'])) {
	        $td_options['category_options'][$new_cat_id]['tdc_image'] = td_demo_media::get_image_url_by_td_id($params_array['background_td_pic_id']);
	        $td_options['category_options'][$new_cat_id]['tdc_bg_repeat'] = 'stretch';
        }


        // update the sidebar if needed
        if (!empty($params_array['sidebar_id'])) {
	        $td_options['category_options'][$new_cat_id]['tdc_sidebar_name'] = $params_array['sidebar_id'];
        }

        // moduel id to sue 123456 (NO MODULE JUST THE NUMBER)
        if (!empty($params_array['tdc_layout'])) {
	        $td_options['category_options'][$new_cat_id]['tdc_layout'] = $params_array['tdc_layout'];
        }

        // update the sidebar position
        // sidebar_left, sidebar_right, no_sidebar
        if (!empty($params_array['tdc_sidebar_pos'])) {
	        $td_options['category_options'][$new_cat_id]['tdc_sidebar_pos'] = $params_array['tdc_sidebar_pos'];
        }

        //update once the category options
	    td_options::schedule_save();

	    //update_option(TD_THEME_OPTIONS_NAME, td_global::$td_options);



        // keep a list of installed category ids so we can delete them later if needed
        // ths is NOT IN WP_011, it's a WordPress option
        $td_stacks_demo_categories_id = get_option('td_demo_categories_id');
        $td_stacks_demo_categories_id []= $new_cat_id;
        update_option('td_demo_categories_id', $td_stacks_demo_categories_id);



        return $new_cat_id;
    }

    static function remove() {
        $td_stacks_demo_categories_id = get_option('td_demo_categories_id');
        if (is_array($td_stacks_demo_categories_id)) {
            foreach ($td_stacks_demo_categories_id as $td_stacks_demo_category_id) {
                wp_delete_category($td_stacks_demo_category_id);
            }
        }
    }
}






class td_demo_content extends td_demo_base {


    static private function parse_content_file($file_path) {

	    if (!file_exists($file_path)) {
		    self::kill(__CLASS__, __FUNCTION__, 'file not found: ' . $file_path);
	    }

        $file_content = file_get_contents($file_path);

	    $search_in_file = self::multi_instring($file_content, array(
			'0div',
		    'localhost',
		    '192.168.0.'
	    ));

		if ($search_in_file !== false) {
			self::kill(__CLASS__, __FUNCTION__, 'found in file content: ' . $search_in_file);
		}




        preg_match_all("/xxx_(.*)_xxx/U", $file_content, $matches, PREG_PATTERN_ORDER);
        /*
        $matches =
        [0] => Array
        (
            [0] => xxx_td_pic_5:300x200_xxx
            [1] => xxx_td_pic_5_xxx
        )

        [1] => Array
        (
            [0] => td_pic_5:300x200
            [1] => td_pic_5
        )
        */
        if (!empty($matches) and is_array($matches)) {
            foreach ($matches[1] as $index => $match) {
                $size = ''; //default image size
                //try to read the size form the match - NOT USED 29.05.2015
                if (strpos($match, ':') !== false) {
                    $match_parts = explode(':', $match);
                    $match = $match_parts[0];
                    $size = explode('x', $match_parts[1]);
                    //print_r($size);
                }
                $file_content = str_replace($matches[0][$index], td_demo_media::get_image_url_by_td_id($match, $size), $file_content);
            }
        }


        unset($matches);
        preg_match_all("/iii_(.*)_iii/U", $file_content, $matches, PREG_PATTERN_ORDER);

        if (!empty($matches) and is_array($matches)) {
            foreach ($matches[1] as $index => $match) {

                $file_content = str_replace($matches[0][$index], td_demo_media::get_by_td_id($match), $file_content);
            }
        }

        return $file_content;
    }


	/**
	 * @param $params
	 * @return int|WP_Error
	 */
    static function add_post($params) {


	    self::check_params(__CLASS__, __FUNCTION__, $params, array(
		    'title' => 'Param is requiered!',
		    'file' => 'Param is requiered!',
		    'categories_id_array' => 'Param is requiered!',
		    'featured_image_td_id' => 'Param is requiered!',
	    ));



        $new_post = array(
            'post_title' => $params['title'],
            'post_status' => 'publish',
            'post_type' => 'post',
            'post_content' => self::parse_content_file($params['file']),
            'comment_status' => 'open',
            'post_category' => $params['categories_id_array'], //adding category to this post
            'guid' => td_global::td_generate_unique_id()
        );

        //new post / page
        $post_id = wp_insert_post($new_post);

        // add our demo custom meta field, using this field we will delete all the pages
        update_post_meta($post_id, 'td_demo_content', true);

        if(!empty($params['post_format'])) {
            set_post_format($post_id, $params['post_format']);
        }

        set_post_thumbnail($post_id, td_demo_media::get_by_td_id($params['featured_image_td_id']));

        // set the post template
        if (!empty($params['template'])) {
            $td_post_theme_settings['td_post_template'] = $params['template'];
        }

        // set the smart list  ex: td_smart_list_3    td_smart_list_1    etc
        if (!empty($params['smart_list'])) {
            $td_post_theme_settings['smart_list_template'] = $params['smart_list'];
        }

        // update the post metadata only if we have something new
        if (!empty($td_post_theme_settings)) {
            update_post_meta($post_id, 'td_post_theme_settings', $td_post_theme_settings, true);
        }


        if (!empty($params['featured_video_url'])) {
            $tmp_meta['td_video'] = $params['featured_video_url'];
            update_post_meta($post_id, 'td_post_video', $tmp_meta);
        }





        return $post_id;
    }


    static function add_page($params) {

	    self::check_params(__CLASS__, __FUNCTION__, $params, array(
		    'title' => 'Param is requiered!',
		    'file' => 'Param is requiered!',
	    ));


        $new_post = array(
            'post_title' => $params['title'],
            'post_status' => 'publish',
            'post_type' => 'page',
            'post_content' => self::parse_content_file($params['file']),
            'comment_status' => 'open',
            'guid' => td_global::td_generate_unique_id()
        );

        //new post / page
        $page_id = wp_insert_post ($new_post);

	    if (is_wp_error($page_id)) {
		    self::kill(__CLASS__, __FUNCTION__, $page_id->get_error_message());
	    }

	    if ($page_id === 0) {
		    self::kill(__CLASS__, __FUNCTION__, 'wp_insert_post returned 0. Not ok! Page title: ' . $params['title']);
	    }

        // add our demo custom meta field, using this field we will delete all the pages
        update_post_meta($page_id, 'td_demo_content', true);

        // set the page template if we have one
        if (!empty($params['template'])) {
            update_post_meta($page_id, '_wp_page_template', $params['template']);
        }


	    $td_homepage_loop = array();
	    $td_page = array();

        // on homepage latest articles
        if (!empty($params['td_layout'])) {
	        $td_homepage_loop['td_layout'] = $params['td_layout'];
        }
        if (!empty($params['list_custom_title_show'])) {
	        $td_homepage_loop['list_custom_title_show'] = $params['list_custom_title_show'];
        }

        if (!empty($params['sidebar_id'])) {
	        $td_homepage_loop['td_sidebar'] = $params['sidebar_id'];
	        $td_page['td_sidebar'] = $params['sidebar_id'];
        }



        // set as homepage?
        if (!empty($params['homepage']) and $params['homepage'] === true) {
            update_option( 'page_on_front', $page_id);
            update_option( 'show_on_front', 'page' );
        }


        if (!empty($params['sidebar_position'])) {
	        $td_page['td_sidebar_position'] = $params['sidebar_position'];
	        $td_homepage_loop['td_sidebar_position'] = $params['sidebar_position'];
        }


        if (!empty($params['limit'])) {
	        $td_homepage_loop['limit'] = $params['limit'];
        }


	    // update td_homepage_loop metadata
	    if (!empty($td_homepage_loop)) {
		    update_post_meta($page_id, 'td_homepage_loop', $td_homepage_loop);
	    }

	    // update td_page
	    if (!empty($td_page)) {
		    update_post_meta($page_id, 'td_page', $td_page);
	    }

        return $page_id;
    }


    static function remove() {
        $args = array(
            'post_type' => array('page', 'post'),
            'meta_key'  => 'td_demo_content',
            'posts_per_page' => '-1'
        );
        $query = new WP_Query( $args );
        if (!empty($query->posts)) {
            foreach ($query->posts as $post) {
                wp_delete_post($post->ID, true);
            }
       }
    }
}






class td_demo_widgets extends td_demo_base {

    private static $last_widget_instance = 70;
    private static $last_sidebar_widget_position = 0;



	private static $hard_coded_sidebars = array (
		'td-default',
		'td-footer-1',
		'td-footer-2',
		'td-footer-3'
	);




    /**
     * adds a new sidebar
     * @param $sidebar_name string - must begin with td_demo_
     */
    static function add_sidebar($sidebar_name) {
        if (substr($sidebar_name, 0, 8) != 'td_demo_') {
	        self::kill(__CLASS__, __FUNCTION__, 'All sidebars used in the demo must begin with td_demo_');
        }
        $tmp_sidebars = td_util::get_option('sidebars');
        $tmp_sidebars[]= $sidebar_name;
        td_util::update_option('sidebars', $tmp_sidebars);
    }


	/**
	 * adds a widget to a sidebar
	 * WARNING "td-" is automatically added to the sidebar name
	 * @param $sidebar_id
	 *          - default - to add to the default sidebar
	 *          - footer-1 - to add to the footer 1
	 *          - footer-2 - to add to the footer 2
	 *          - footer-3 - to add to the footer 3
	 *          - OR any custom sidebar created with @see td_demo_widgets::add_sidebar()
	 * @param $widget_name - the id of the widget
	 * @param $atts
	 */
    static function add_widget_to_sidebar($sidebar_id, $widget_name, $atts) {

        $tmp_sidebars = td_util::get_option('sidebars');
	    if (empty($tmp_sidebars)) {
		    $tmp_sidebars = array();
	    }


        if (
            !in_array('td-' . $sidebar_id, self::$hard_coded_sidebars) and
            !in_array($sidebar_id, $tmp_sidebars)
        ) {
	        self::kill(__CLASS__, __FUNCTION__, 'td_demo_widgets::add_widget_to_sidebar - No sidebar with the name provided! - td-' . $sidebar_id . ' (note that "td-" is automatically added to the sidebars name). Current registered sidebars: ', array_merge(self::$hard_coded_sidebars, $tmp_sidebars));
        }

        $widget_instances = get_option('widget_' . $widget_name);
        //in the demo mode, all the widgets will have an istance id of 70+
        $widget_instances[self::$last_widget_instance] = $atts;

        //add the widget instance to the database
        update_option('widget_' . $widget_name, $widget_instances);

        //print_r($widget_instances);
        $sidebars_widgets = get_option( 'sidebars_widgets' );

        //print_r($sidebars_widgets);
        $sidebars_widgets['td-' . td_util::sidebar_name_to_id($sidebar_id)][self::$last_sidebar_widget_position] = $widget_name . '-' . self::$last_widget_instance;
        //print_r($sidebars_widgets);
        update_option('sidebars_widgets', $sidebars_widgets);


        self::$last_sidebar_widget_position++;
        self::$last_widget_instance++;

    }


	/**
	 * Removes all widgets from the default sidebar.
	 * @param $sidebar_id - one of the following: default, footer-1, footer-2, footer-3
	 */
    static function remove_widgets_from_sidebar($sidebar_id = 'default') {

	    if (!in_array('td-' . $sidebar_id, self::$hard_coded_sidebars)) {
		    self::kill(__CLASS__, __FUNCTION__, 'You can only remove widgets from the hardcoded sidebars. For custom made sidebars during the import, there is no need to remove the widgets', self::$hard_coded_sidebars);
	    }


        $sidebar_id = td_util::sidebar_name_to_id($sidebar_id);
        $sidebars_widgets = get_option( 'sidebars_widgets' );

        if (isset($sidebars_widgets['td-' . $sidebar_id])) {
            //empty the default sidebar
            $sidebars_widgets['td-' . $sidebar_id] = array();
            update_option('sidebars_widgets', $sidebars_widgets);
        }
    }


    /**
     * remove the sidebars that begin with td_demo_
     */
    static function remove() {
        $tmp_sidebars = td_util::get_option('sidebars');
        if (!empty($tmp_sidebars)) {
            foreach ($tmp_sidebars as $index => $sidebar) {
                if (substr($sidebar, 0, 8) == 'td_demo_') {
                    unset($tmp_sidebars[$index]);
                }
            }
	        td_util::update_option('sidebars', $tmp_sidebars);
        }

    }
}


/**
 * tagDiv menu creating class
 * Class td_demo_menus
 */
class td_demo_menus extends td_demo_base {


    private static $allowed_menu_names = array(
        'td-demo-top-menu',
        'td-demo-header-menu',
        'td-demo-footer-menu',
    );



    /**
     * creates a menu and adds it to a location of the theme
     * @param $menu_name
     * @param $location
     * @return int menu id
     */
    static function create_menu($menu_name, $location) {
        if (!in_array($menu_name, self::$allowed_menu_names)) {
	        self::kill(__CLASS__, __FUNCTION__, 'menu_name is not in allowed_menu_names. Menu name must be one of: ', self::$allowed_menu_names);
        }

	    $menu_exists = wp_get_nav_menu_object( $menu_name );
		if ($menu_exists === false) { // check if the menu already exists
			$menu_id = wp_create_nav_menu($menu_name);
			if (is_wp_error($menu_id)) {
				self::kill(__CLASS__, __FUNCTION__, $menu_id->get_error_message());
			}

			$menu_spots_array = get_theme_mod('nav_menu_locations');
			// activate the menu only if it's not already active
			if (!isset($menu_spots_array[$location]) or $menu_spots_array[$location] != $menu_id) {
				$menu_spots_array[$location] = $menu_id;
				set_theme_mod('nav_menu_locations', $menu_spots_array);
			}

			return $menu_id;
		} else {
			return $menu_exists->term_id;
		}
    }


	/**
	 * Adds a link to a menu
	 * @param $menu_params
	 * @return int|WP_Error
	 */
    static function add_link($menu_params) {
	    // requiered parameters
	    self::check_params(__CLASS__, __FUNCTION__, $menu_params, array(
		    'title' => 'Param is requiered!',
		    'url' => 'Param is requiered!',
		    'add_to_menu_id' => 'A menu id generated by td_demo_menus::create_menu is requiered'
	    ));


	    $itemData =  array (
            'menu-item-object' => '',
            'menu-item-type'      => 'custom',
            'menu-item-title'    => $menu_params['title'],
            'menu-item-url' => $menu_params['url'],
            'menu-item-status'    => 'publish'
        );

        if (!empty($menu_params['parent_id'])) {
            $itemData['menu-item-parent-id'] = $menu_params['parent_id'];
        }

        $menu_item_id = wp_update_nav_menu_item($menu_params['add_to_menu_id'], 0, $itemData);
        return $menu_item_id;
    }


	/**
	 * @param $menu_params
	 *  - requiered -
	 *      - page_id
	 *      - add_to_menu_id
	 *  - optional -
	 *      - parent_id -
	 */
    static function add_page($menu_params) {

	    // requiered parameters
	    self::check_params(__CLASS__, __FUNCTION__, $menu_params, array(
			'page_id' => 'To add a page to the menu, you need a page_ID. To add links or empty items, use td_demo_menus::add_link()',
		    'add_to_menu_id' => 'A menu id generated by td_demo_menus::create_menu is requiered'
	    ));


        //$menu_id, $title='', $page_id, $parent_id = ''
        $itemData =  array(
            'menu-item-object-id' => $menu_params['page_id'],
            'menu-item-parent-id' => 0,
            'menu-item-object' => 'page',
            'menu-item-type'      => 'post_type',
            'menu-item-status'    => 'publish'
        );

        if (!empty($menu_params['parent_id'])) {
            $itemData['menu-item-parent-id'] = $menu_params['parent_id'];
        }

	    // if no titlte is provided, wordpress will show the title of the page
        if (!empty($menu_params['title'])) {
            $itemData['menu-item-title'] = $menu_params['title'];
        }

		// we do not use the menu id anywhere for now
        $menu_item_id = wp_update_nav_menu_item($menu_params['add_to_menu_id'], 0, $itemData);
    }


    /**
     * adds a mega menu to a menu
     * @param $menu_params
     * @return int|WP_Error
     */
    static function add_mega_menu($menu_params) {

	    // requiered parameters
	    self::check_params(__CLASS__, __FUNCTION__, $menu_params, array(
		    'title' => 'Param is requiered!',
		    'category_id' => 'Param is requiered! - this is the category id that will be used to generate the mega menu',
		    'add_to_menu_id' => 'A menu id generated by td_demo_menus::create_menu is requiered'
	    ));



	    $itemData =  array(
            'menu-item-object' => '',
            'menu-item-type'      => 'custom',
            'menu-item-title'    => $menu_params['title'],
            'menu-item-url' => '#',
            'menu-item-status'    => 'publish'
        );

        $menu_item_id =  wp_update_nav_menu_item($menu_params['add_to_menu_id'], 0, $itemData);
        update_post_meta($menu_item_id, 'td_mega_menu_cat', $menu_params['category_id']);
        return $menu_item_id;
    }


	/**
	 * adds a category to a menu
	 * @param $menu_params
	 */
    static function add_category($menu_params) {

	    // requiered parameters
	    self::check_params(__CLASS__, __FUNCTION__, $menu_params, array(
		    'title' => 'Param is requiered!',
		    'category_id' => 'Param is requiered! - this is the category id that will be used to generate the mega menu',
		    'add_to_menu_id' => 'A menu id generated by td_demo_menus::create_menu is requiered'
	    ));


        $itemData =  array(
            'menu-item-title' => $menu_params['title'],
            'menu-item-object-id' => $menu_params['category_id'],
            'menu-item-db-id' => 0,
            'menu-item-url' => get_category_link($menu_params['category_id']),
            'menu-item-type' => 'taxonomy', //taxonomy
            'menu-item-status' => 'publish',
            'menu-item-object' => 'category',
        );

        if (!empty($menu_params['parent_id'])) {
            $itemData['menu-item-parent-id'] = $menu_params['parent_id'];
        }

        wp_update_nav_menu_item($menu_params['add_to_menu_id'], 0, $itemData);
    }


    /**
     * removes all the menus, used by uninstall
     */
    static function remove() {
        foreach (self::$allowed_menu_names as $menu_name) {
            wp_delete_nav_menu($menu_name);
        }
    }
}






//$td_stacks_media->td_media_sideload_image('http://demo.tagdiv.com/newsmag/wp-content/uploads/2014/08/38.jpg', '');
class td_demo_media extends td_demo_base {
    /**
     * Download an image from the specified URL and attach it to a post.
     *
     * @since 2.6.0
     *
     * @param string $file The URL of the image to download
     * @param int $post_id The post ID the media is to be associated with
     * @param string $desc Optional. Description of the image
     * @return string|WP_Error Populated HTML img tag on success
     */
    static function add_image_to_media_gallery($td_attachment_id, $file, $post_id = '', $desc = null ) {

        require_once(ABSPATH . 'wp-admin/includes/media.php');
        require_once(ABSPATH . 'wp-admin/includes/file.php');
        require_once(ABSPATH . 'wp-admin/includes/image.php');


        // Set variables for storage, fix file filename for query strings.
        preg_match( '/[^\?]+\.(jpe?g|jpe|gif|png)\b/i', $file, $matches );
        $file_array = array();
        $file_array['name'] = basename( $matches[0] );

        // Download file to temp location.
        $file_array['tmp_name'] = download_url( $file );

        // If error storing temporarily, return the error.
        if ( is_wp_error( $file_array['tmp_name'] ) ) {
            @unlink($file_array['tmp_name']);
            echo 'is_wp_error $file_array: ' . $file;
            print_r($file_array['tmp_name']);
            return $file_array['tmp_name'];
        }

        // Do the validation and storage stuff.
        $id = media_handle_sideload( $file_array, $post_id, $desc ); //$id of attachement or wp_error

        // If error storing permanently, unlink.
        if ( is_wp_error( $id ) ) {
            @unlink( $file_array['tmp_name'] );
            echo 'is_wp_error $id: ' . $id->get_error_messages() . ' ' . $file;
            return $id;
        }


        update_post_meta($id, 'td_demo_attachment', $td_attachment_id);

        return $id;
    }



    static function remove() {
        $args = array(
            'post_type' => array('attachment'),
            'post_status' => 'inherit',
            'meta_key'  => 'td_demo_attachment',
            'posts_per_page' => '-1'
        );
        $query = new WP_Query( $args );


        if (!empty($query->posts)) {
            foreach ($query->posts as $post) {
                $return_value = wp_delete_attachment($post->ID, true);
                if ($return_value === false) {
                    echo 'td_demo_media::remove - failed to delete image id:' . $post->ID ;
                }
                //echo 'deleting: ' . $post->ID;
            }
        }
    }


    static function get_by_td_id($td_id) {
        $args = array(
            'post_type' => array('attachment'),
            'post_status' => 'inherit',
            'meta_key'  => 'td_demo_attachment',
            'posts_per_page' => '-1'
        );

        //@todo big problem here - we rely on the wp_cache from get_post_meta too much
        $query = new WP_Query( $args );
        if (!empty($query->posts)) {
            foreach ($query->posts as $post) {
                //search for our td_id in the post meta
                $pic_td_id = get_post_meta($post->ID, 'td_demo_attachment', true);
                if ($pic_td_id == $td_id) {
                    return $post->ID;
                    break;
                }
            }
        }
        return false;
    }


    static function get_image_url_by_td_id($td_id, $size = 'full') {
        $image_id = self::get_by_td_id($td_id);
        if($image_id !== false) {
            $attachement_array = wp_get_attachment_image_src($image_id, $size, false );
            if (!empty($attachement_array[0])) {
                return $attachement_array[0];
            }

        }
        return false;
    }


}