<?php
/**
 * The Strangecode Codebase - a general application development framework for PHP
 * For details visit the project site: <http://trac.strangecode.com/codebase/>
 * Copyright 2001-2012 Strangecode, LLC
 * 
 * This file is part of The Strangecode Codebase.
 *
 * The Strangecode Codebase is free software: you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as published by the
 * Free Software Foundation, either version 3 of the License, or (at your option)
 * any later version.
 * 
 * The Strangecode Codebase 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 General Public License for more
 * details.
 * 
 * You should have received a copy of the GNU General Public License along with
 * The Strangecode Codebase. If not, see <http://www.gnu.org/licenses/>.
 */

/**
 * Google_API.inc.php
 *
 * Interface to the Google API using SOAP/Client.php.
 *
 * @author  Quinn Comendant <quinn@strangecode.com>
 * @version 1.1
 */

// Example of use:
//
// require_once 'Google_API.php';
// $google = new Google_API('your license key');
// $result = $google->search(
//   array(
//     'query' => 'sebastian bergmann'
//   )
// );
// if (false !== $result) {
//   print_r($result);
// } else {
//   echo 'Query failed.';
// }

require_once 'SOAP/Client.php';

class Google_API {

    /**
     * @var    string
     * @access private
     */
    var $_licenseKey = '';

    /**
     * @var    object
     * @access private
     */
    var $_soapClient = NULL;

    /**
     * Constructor.
     *
     * @param  string
     * @access public
     */
    function Google_API($licenseKey)
    {
        $this->_licenseKey = $licenseKey;
        $this->_soapClient = new SOAP_Client(
          'http://api.google.com/search/beta2'
        );
    }

    /**
     * Retrieves a page by URL from the Google Cache.
     *
     * @param  string
     * @return mixed
     * @access public
     */
    function getCachedPage($url)
    {
        $result = $this->_performAPICall(
            'doGetCachedPage',
            array(
                'key' => $this->_licenseKey,
                'url' => $url
            )
        );
        if ($result) {
            $result = base64_decode($result);
        }
        return $result;
    }

    /**
     * Retrieves a spelling suggestion for a phrase.
     *
     * @param  string
     * @return mixed
     * @access public
     */
    function getSpellingSuggestion($phrase)
    {
        return $this->_performAPICall(
            'doSpellingSuggestion',
            array(
                'key'    => $this->_licenseKey,
                'phrase' => $phrase
            )
        );
    }

    /**
     * Performs a web search.
     *
     * @param  array
     * @return mixed
     * @access public
     */
    function search($parameters = array())
    {
        if (!isset($parameters['query'])) {
            return false;
        }
        return $this->_performAPICall(
            'doGoogleSearch',
            array(
                'key'         => $this->_licenseKey,
                'q'           => $parameters['query'],
                'start'       => isset($parameters['start'])      ? $parameters['start']      : 0,
                'maxResults'  => isset($parameters['maxResults']) ? $parameters['maxResults'] : 10,
                'filter'      => isset($parameters['filter'])     ? $parameters['filter']     : false,
                'restrict'    => isset($parameters['restrict'])   ? $parameters['restrict']   : '',
                'safeSearch'  => isset($parameters['safeSearch']) ? $parameters['safeSearch'] : false,
                'lr'          => isset($parameters['lr'])         ? $parameters['lr']         : '',
                'ie'          => isset($parameters['ie'])         ? $parameters['ie']         : '',
                'oe'          => isset($parameters['oe'])         ? $parameters['oe']         : ''
            )
        );
    }

    /**
     * @param  string
     * @param  array
     * @return mixed
     * @access private
     */
    function _performAPICall($apiCall, $parameters)
    {
        $app =& App::getInstance();
        
        $result = $this->_soapClient->call(
            $apiCall,
            $parameters,
            'urn:GoogleSearch'
        );
        if (!PEAR::isError($result)) {
            return $result;
        } else {
            $app->logMsg(sprintf('Soap Pear error: %s', $result->getMessage()), LOG_NOTICE, __FILE__, __LINE__);
            return false;
        }
    }
}
?>