<?php
  /**
   * Copyright (c) 2013 Bart Visscher <bartv@thisnet.nl>
   * This file is licensed under the Affero General Public License version 3 or
   * later.
   * See the COPYING-README file.
   */
  
  namespace OC\Template;
  
  abstract class ResourceLocator {
  	protected $theme;
  	protected $form_factor;
  
  	protected $mapping;
  	protected $serverroot;
  	protected $thirdpartyroot;
  	protected $webroot;
  
  	protected $resources = array();

  	/**
  	 * @param string $theme
  	 * @param string $form_factor
  	 */

  	public function __construct( $theme, $form_factor, $core_map, $party_map ) {
  		$this->theme = $theme;
  		$this->form_factor = $form_factor;
  		$this->mapping = $core_map + $party_map;
  		$this->serverroot = key($core_map);
  		$this->thirdpartyroot = key($party_map);
  		$this->webroot = $this->mapping[$this->serverroot];
  	}
  
  	abstract public function doFind( $resource );
  	abstract public function doFindTheme( $resource );
  
  	public function find( $resources ) {
  		try {
  			foreach($resources as $resource) {
  				$this->doFind($resource);
  			}
  			if (!empty($this->theme)) {
  				foreach($resources as $resource) {
  					$this->doFindTheme($resource);
  				}
  			}
  		} catch (\Exception $e) {
  			throw new \Exception($e->getMessage().' formfactor:'.$this->form_factor
  						.' serverroot:'.$this->serverroot);
  		}
  	}
  
  	/*

  	 * append the $file resource if exist at $root
  	 * @param string $root path to check
  	 * @param string $file the filename
  	 * @param string|null $webroot base for path, default map $root to $webroot

  	 */
  	protected function appendIfExist($root, $file, $webroot = null) {
  		if (is_file($root.'/'.$file)) {
  			if (!$webroot) {
  				$webroot = $this->mapping[$root];
  			}
  			$this->resources[] = array($root, $webroot, $file);
  			return true;
  		}
  		return false;
  	}
  
  	public function getResources() {
  		return $this->resources;
  	}
  }