<?php

class Qs_GeoCode
{
    protected $_format = 'json';
    protected $_sensor = false;
    protected $_url = 'http://maps.googleapis.com/maps/api/geocode';
    protected $_cachePath;
    protected $_logPath;
    protected $_logFileName;
    protected $_cache;

    public function __construct()
    {
        $this->_cachePath = BASE_PATH . '/tmp/geocode/cache';
        $this->_logPath = BASE_PATH . '/tmp/geocode/log';
        $this->_logFileName = $this->_logPath . '/' . date('Y-m-d') . '.log';
        $this->_initPath($this->_cachePath);
        $this->_initPath($this->_logPath);
        $frontendOptions = array('automatic_serialization' => true, 'lifetime' => null);
        $backendOptions  = array(
            'cache_dir'         => $this->_cachePath . '/',
            'cache_file_perm'  => 0664,
        );
        $this->_cache = Zend_Cache::factory('Core', 'File', $frontendOptions, $backendOptions);
    }

    protected function _initPath($path)
    {
        if (!file_exists($path)) {
            umask(0);
            if (false === mkdir($path, 0777, true)) {
                throw new Exception('Can not create path');
            }
        }
    }

    public function findAddress($address)
    {
        $this->_cache->getBackend()->setOption('file_name_prefix', 'address');
        $cacheId = preg_replace('/[^a-zA-Z0-9_]/', '', $address);
        if (empty($cacheId)) {
            return false;
        }
        if (false !== ($response = $this->_cache->load($cacheId))) {
            return $response['results'];
        }
        $query = array(
            'sensor'  => json_encode($this->_sensor),
            'address' => $address
        );
        $url = $this->_url . '/' . $this->_format . '?' . http_build_query($query);
        try {
            $client = new Zend_Http_Client($url);
            $httpResponse = $client->request();
            $body = $httpResponse->getBody();
            $response = Zend_Json::decode($body);
            if (0 === strcasecmp($response['status'], 'OK')) {
                $this->_cache->save($response, $cacheId);
                return $response['results'];
            } else {
                $this->log('Invalid Response: see detail in file ' . $this->logResponse($httpResponse));
            }
        } catch (Exception $e) {
            $this->log('Exception: ' . $e->getMessage());
        }
        return false;
    }

    public function findAddressLocation($address)
    {
        if (false !== ($results = $this->findAddress($address))) {
            $firstResult = reset($results);
            return Qs_Array::get($firstResult, 'geometry[location]', false);
        }
        return false;
    }

    public function log($text)
    {
        if (false === ($handle = fopen($this->_logFileName, 'w+'))) {
            return $this;
        }
        fwrite($handle, date('Y-m-d H:i:s') . "\t" . $_SERVER['REMOTE_ADDR'] . "\t" . $text. "\n");
        fclose($handle);
        return $this;
    }

    public function logResponse(Zend_Http_Response $httpResponse)
    {
        $fileName = $this->_logPath . '/response' . date('H-i:s') . '.log';
        $handle = fopen($fileName, 'w+');
        fwrite($handle, $httpResponse->getRawBody());
        fclose($handle);
        return basename($fileName);
    }
}