<?php
  /**
   * ownCloud
   *
   * @author Frank Karlitschek
   * @copyright 2012 Frank Karlitschek frank@owncloud.org
   *
   * This library is free software; you can redistribute it and/or
   * modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
   * License as published by the Free Software Foundation; either
   * version 3 of the License, or any later version.
   *
   * This library is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU AFFERO GENERAL PUBLIC LICENSE for more details.
   *
   * You should have received a copy of the GNU Affero General Public
   * License along with this library.  If not, see <http://www.gnu.org/licenses/>.
   *
   */

  namespace OC;
  use OCP\Search\Provider;
  use OCP\ISearch;

  
  /**

   * Provide an interface to all search providers

   */

  class Search implements ISearch {

  	private $providers = array();
  	private $registeredProviders = array();

  
  	/**

  	 * Search all providers for $query
  	 * @param string $query
  	 * @return array An array of OC\Search\Result's

  	 */

  	public function search($query) {
  		$this->initProviders();
  		$results = array();
  		foreach($this->providers as $provider) {
  			/** @var $provider Provider */
  			$results = array_merge($results, $provider->search($query));
  		}
  		return $results;

  	}
  
  	/**

  	 * Remove all registered search providers

  	 */

  	public function clearProviders() {
  		$this->providers=array();
  		$this->registeredProviders=array();

  	}
  
  	/**

  	 * Remove one existing search provider
  	 * @param string $provider class name of a OC\Search\Provider

  	 */

  	public function removeProvider($provider) {
  		$this->registeredProviders = array_filter(
  			$this->registeredProviders,
  			function ($element) use ($provider) {
  				return ($element['class'] != $provider);
  			}

  		);
  		// force regeneration of providers on next search

  		$this->providers=array();

  	}

  	/**
  	 * Register a new search provider to search with
  	 * @param string $class class name of a OC\Search\Provider
  	 * @param array $options optional
  	 */
  	public function registerProvider($class, $options=array()) {
  		$this->registeredProviders[]=array('class'=>$class, 'options'=>$options);
  	}

  
  	/**

  	 * Create instances of all the registered search providers

  	 */

  	private function initProviders() {
  		if(count($this->providers)>0) {

  			return;
  		}

  		foreach($this->registeredProviders as $provider) {
  			$class = $provider['class'];
  			$options = $provider['options'];
  			$this->providers[]=new $class($options);

  		}
  	}

  }