<?php

class Navigation_Core
{
    public $navigation;
    public $headings;
    public $subs;

    public function __construct(){

    }

	/**
	 * Creates a new Navigation.
	 *
	 * @return  object
	 */
	public static function factory()
	{
		return new Navigation();
	}

    public static function save(){

        // Get kohana,
        $K = Kohana::instance();

        switch( $K->uri->segment(4) ){

            case 'order' :

                $new = json_decode($K->input->post('menu_new'), true);
                $old = json_decode($K->input->post('menu_old'), true);

                // need to have js not fire ajax when old is empty
                if(count($old) == 0) return;

                foreach($new AS $k => $v){
                    if($v != $old[$k]){
                        $id = str_replace('nid_', '', $k);
                        $o  = str_replace('mo_', '', $v);
                        $nav = ORM::factory('nav', $id);
                        $nav->order_num = $o;
                        $nav->save();
                    } // end if

                } // end foreach
            break;

            default :
                header('Content-type: text/x-javascript');
                echo "alert('bad request')";
                exit();
            break;
        } // end swtich segment(4)

    }

    /**
     * Creates Site Navigation
     *
     *  Separates the top and side navs of site.
     *
     * @todo Set the config var for the sites limit
     * @return object consisting of new top and side
     */

    public function siteMenu(){

        // build it
        $this->_build();

        // get ready for the nav
        $navigation = new stdClass();

        // make the top and side navs seperate
        $length = 5;
        $offset = 0;
        $top  = array_slice($this->navigation, $offset, $length);
        $side = array_slice($this->navigation, $length);

        // turn the arrays into ol for nav
        $navigation->top  = html::ol($top, array('id'=>'top_menu_ol'));
        $navigation->side = html::ol($side, array('id'=>'side_menu_ol'));

        return $navigation;

    } // end get()

    /**
     * Builds the complete HTML ready navigation
     * for the Class
     *
     * @return array of completed navigation
     */

    private function _build(){

        $this->headings = ORM::factory('nav')->getHeadings();
        $this->subs     = ORM::factory('nav')->getSubHeadings();

        // set vars in case empty
        $n = array();
        $s = array();

        // get all the nav with no parents
        $navs = $this->headings;
        foreach($navs AS $nav){

			// used to set the att in the anchors
        	$n_attr = array(
        		'id'    => 'nid_' . $nav->id,
        		'class' => 'menu_heading',
                'rel'   => $nav->window_rel->name,
                'title' => $nav->page->title
        	);

			// check if heading has no link
			empty($nav->page->name) ?                    // no rel tag in spans
            $n[$nav->id] = html::tag($nav->name, 'span', arr::un_set('rel', $n_attr)):
                $n[$nav->id] = html::anchor($nav->page->name, $nav->name, $n_attr);

        }

        // get all sub navs
        $subs = $this->subs;
        foreach($subs AS $sub){

			// used to set the att in the anchors
        	$s_attr = array(
        		'id'    => 'nid_' . $sub->id,
        		'class' => 'menu_sub',
                'rel'   => $sub->window_rel->name,
                'title' => $sub->page->title
        	);

        	// check if heading has no link
        	empty($sub->page->name) ?                                     // no rel tag in spans
            $s[$sub->parent_id][$sub->id] = html::tag($sub->name, 'span', arr::un_set('rel', $s_attr)):
			$s[$sub->parent_id][$sub->id] = html::anchor($sub->page->name, $sub->name, $s_attr);

        }

        // merge the headings with their subs
        foreach($n AS $k => $heading){

        	if(array_key_exists($k, $s)){
        		$navi[$heading] = $s[$k];
        	} else {
        		$navi[] = $heading;
        	}

        }

        // if there is no navi we have a big problem
        if( ! isset($navi) )
            throw new Outland_Exception('System', 'Could not locate your navigation');

            $this->navigation = $navi;
    }

}// end class Navigation