<?php

/**
 * WordPress Menu Utilities
 * to support BEM class namings
 * conventions
 *
 * @author Max G J Panas <http://maxpanas.com>
 */

/**
 * Class MOZ_Menu
 *
 */
class MOZ_Menu {

	/**
	 * Print a wp nav menu for
	 * the given theme location
	 * using some sensible defaults
	 *
	 * @param string $theme_location
	 * @param array  $extras
	 */
	public static function nav_menu( $theme_location = 'primary', $extras = array (), $cacheTime = 0 ) {
		echo self::get_nav_menu( $theme_location, $extras, $cacheTime );
	}

	/**
	 * Return a wp nav menu for
	 * the given theme location
	 * using some sensible defaults
	 *
	 * @param string $theme_location
	 * @param array  $extras
	 *
	 * @returns string
	 */
	public static function get_nav_menu( $theme_location = 'primary', $extras = array (), $cacheTime = 0 ) {
		$menu_class = isset( $extras['menu_class'] ) && !empty( $extras['menu_class'] ) ? $extras['menu_class'] : 'menu';

		$container_class = 'menu' === $menu_class ? "$menu_class $menu_class--$theme_location" : $menu_class;

		$show_level_class = isset( $extras['show_level_class'] ) ? ( bool ) $extras['show_level_class'] : true;

		$wrap_class = "{$menu_class}__list";
		if ( $show_level_class ) {
			$wrap_class .= " {$menu_class}__list--level-0";
		}

		if ( $cacheTime > 0 ) {
			$cacheKey = MOZ_Cache::create_page_key( $theme_location, $extras );
			$cachedOutput = MOZ_Cache::read( $cacheKey );
		} else {
			$cachedOutput = FALSE;
		}

		if ( $cachedOutput === FALSE ) {
			$navOutput = wp_nav_menu( array_merge( array (
				'echo' => false,
				'theme_location' => $theme_location,
				'container' => 'div',
				'container_class' => $container_class,
				'menu_class' => $menu_class,
				'show_level_class' => $show_level_class,
				'items_wrap' => "<ul class=\"{$wrap_class}\">%3\$s</ul>",
				'fallback_cb' => false,
				'walker' => new MOZ_Walker_Nav_Menu
							), $extras ) );
		} else {
			$navOutput = $cachedOutput;
		}

		if ( $cacheTime > 0 ) {
			MOZ_Cache::write( $cacheKey, $navOutput, $cacheTime );
		}

		return $navOutput;
	}

	/**
	 * Get menu items for a given
	 * menu location
	 *
	 * @param string $theme_location
	 *
	 * @return array|bool|false
	 */
	public static function get_menu_items( $theme_location = 'primary' ) {
		$locations = get_nav_menu_locations();

		if ( !isset( $locations[$theme_location] ) ) {
			return false;
		}

		$menu_id = $locations[$theme_location];
		if ( function_exists( 'wpml_object_id' ) ) {
			$menu_id = wpml_object_id( ( int ) $menu_id, 'nav_menu' );
		}

		return wp_get_nav_menu_items( $menu_id );
	}

	/**
	 * Get a menu item given
	 * an object_id
	 *
	 * @param array|string $menu array of menu items, or menu location id
	 * @param int          $item_id
	 *
	 * @return bool
	 */
	public static function get_menu_item( $menu = 'primary', $item_id = 0 ) {
		if ( is_string( $menu ) ) {
			$menu = self::get_menu_items( $menu );
		}

		if ( !$item_id ) {
			$item_id = get_queried_object_id();
		}

		foreach ( ( array ) $menu as $item ) {
			if ( ( int ) $item_id === ( int ) $item->object_id ) {
				return $item;
			}
		}

		return false;
	}

	/**
	 * Get the parent menu items
	 * given an object_id
	 *
	 * @param array|string $menu array of menu items, or menu location id
	 * @param int          $item_id
	 *
	 * @return array|bool
	 */
	public static function get_parent_menu_items( $menu = 'primary', $item_id = 0 ) {
		if ( is_string( $menu ) ) {
			$menu = self::get_menu_items( $menu );
		}

		if ( !$menu ) {
			return $menu;
		}

		if ( !$item_id ) {
			$item_id = get_queried_object_id();
		}

		$parent_id = $item_id;
		$parents = array ();
		foreach ( array_reverse( ( array ) $menu ) as $menu_item ) {
			if ( $menu_item->object_id == $parent_id || $menu_item->ID == $parent_id ) {
				if ( $parent_id != $item_id ) {
					$parents[] = $menu_item;
				}

				if ( !( $parent_id = $menu_item->menu_item_parent ) ) {
					return array_reverse( $parents );
				}
			}
		}

		return array ();
	}

}