<?php
/**
 * Custom Walker
 *
 * @access      public
 * @since       1.0 
 * @return      void
*/

// Exit if accessed directly
if ( ! defined( 'ABSPATH' ) ) {
	exit;
}






class shrk_menu_walker extends Walker_Nav_Menu
{
	/**
	 * @see Walker::start_lvl()
	 * @since 1.0
	 *
	 * @param string $output Passed by reference. Used to append additional content.
	 * @param int $depth Depth of page. Used for padding.
	 */
	function start_lvl( &$output, $depth = 0, $args = Array() ) {
		
		$indent = str_repeat( "\t", $depth );
		if($depth == 0){
			$output    .= "\n$indent<ul class=\"sub-menu ".($args->has_children ? "container" : "")." \">\n";  
		} else {
			$output    .= "\n$indent<ul>\n";  
			
		}
		
	}

	/**
	 * @see Walker::start_el()
	 * @since 1.0
	 *
	 * @param string $output Passed by reference. Used to append additional content.
	 * @param object $item Menu item data object.
	 * @param int $depth Depth of menu item. Used for padding.
	 * @param int $current_page Menu item ID.
	 * @param object $args
	 */
	function start_el( &$output, $item, $depth = 0, $args = array(), $id = 0 ) {
		global $wp_query;
		$indent = ( $depth ) ? str_repeat( "\t", $depth ) : '';

		/**
		 * Dividers & Headers
			 * ==================
		 * Determine whether the item is a Divider, Header, or regular menu item.
		 * To prevent errors we use the strcasecmp() function to so a comparison
		 * that is not case sensitive. The strcasecmp() function returns a 0 if 
		 * the strings are equal.
		 */
		if (strcasecmp($item->title, 'divider') == 0) {
			// Item is a Divider
			$output .= $indent . '<li class="divider">';
		} else if (strcasecmp($item->title, 'divider-vertical') == 0) {
			// Item is a Vertical Divider
			$output .= $indent . '<li class="divider-vertical">';
		} else if (strcasecmp($item->title, 'dropdown-header') == 0) {
			// Item is a Header
			$output .= $indent . '<li class="dropdown-header">' . esc_attr( $item->attr_title );
		} else {

			$class_names = $value = '';
			$classes = empty( $item->classes ) ? array() : (array) $item->classes;
			$classes[] = ( !empty( $item->current ) && $item->current ) ? 'active' : '';
			$classes[] = ( !empty( $item->mmenu_active ) && $item->mmenu_active == '1') ? 'megamenu' : 'no-megamenu';
			$classes[] = ( !empty( $item->mmenu_fullwidth ) && $item->mmenu_fullwidth == '1') ? 'fullwidth' : 'autowidth';
			$classes[] = 'menu-item-' . $item->ID;
			$class_names = join( ' ', apply_filters( 'nav_menu_css_class', array_filter( $classes ), $item, $args ) );

			if ($args->has_children && $depth > 0) {
				$class_names .= ' dropdown-submenu';
			} else if($args->has_children && $depth === 0) {
				$class_names .= ' dropdown';
			}

			$class_names = $class_names ? ' class="' . esc_attr( $class_names ) . '"' : '';

			$id = apply_filters( 'nav_menu_item_id', 'menu-item-'. $item->ID, $item, $args );
			$id = $id ? ' id="' . esc_attr( $id ) . '"' : '';

			$output .= $indent . '<li' . $id . $value . $class_names .'>';

			$attributes = ! empty( $item->target )     ? ' target="' . esc_attr( $item->target     ) .'"' : '';
			$attributes .= ! empty( $item->xfn )        ? ' rel="'    . esc_attr( $item->xfn        ) .'"' : '';
			$attributes .= ! empty( $item->url )        ? ' href="'   . esc_attr( $item->url        ) .'"' : '';
			$attributes .= ($args->has_children)      ? ' data-toggle="dropdown" data-target="#" class="dropdown-toggle"' : '';

			$item_output = $args->before;
			
			/**
			 * Glyphicons
			 * ===========
			 * Since the the menu item is NOT a Divider or Header we check the see
			 * if there is a value in the attr_title property. If the attr_title
			 * property is NOT null we apply it as the class name for the glyphicon.
			 */
			if(! empty( $item->attr_title )){
				$item_output .= '<a'. $attributes .'><i class="' . esc_attr( $item->attr_title ) . '"></i>&nbsp;';
			} else {
				$item_output .= '<a'. $attributes .'>';
			}
			
			$item_output .= $args->link_before . apply_filters( 'the_title', $item->title, $item->ID ) . $args->link_after;
			$item_output .= ($args->has_children && $depth == 0) ? ' <span class="caret"></span></a>' : '</a>';
			$item_output .= $args->after;

			$output .= apply_filters( 'walker_nav_menu_start_el', $item_output, $item, $depth, $args );
		}
	}

	/**
	 * Traverse elements to create list from elements.
	 *
	 * Display one element if the element doesn't have any children otherwise,
	 * display the element and its children. Will only traverse up to the max
	 * depth and no ignore elements under that depth. 
	 *
	 * This method shouldn't be called directly, use the walk() method instead.
	 *
	 * @see Walker::start_el()
	 * @since 1.0
	 *
	 * @param object $element Data object
	 * @param array $children_elements List of elements to continue traversing.
	 * @param int $max_depth Max depth to traverse.
	 * @param int $depth Depth of current element.
	 * @param array $args
	 * @param string $output Passed by reference. Used to append additional content.
	 * @return null Null on failure with no changes to parameters.
	 */
	function display_element( $element, &$children_elements, $max_depth, $depth, $args, &$output ) {
		if ( !$element ) {
			return;
		}

		$id_field = $this->db_fields['id'];

				//display this element
		if ( is_object( $args[0] ) ) {
			$args[0]->has_children = ! empty( $children_elements[$element->$id_field] );
		}

		parent::display_element($element, $children_elements, $max_depth, $depth, $args, $output);
	}
}