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<?php

namespace WPGMZA;

/**
 * Server side Google Maps geocoding.
 */
class GoogleGeocoder
{
    /**
     * @var The Google API key to be used for geocoding
     */
    public $apiKey;
    
    /**
     * Constructor.
     * @param string $apiKey The Google Maps API key to use for geocoding
     */
    public function __construct($apiKey)
    {
        $this->apiKey = $apiKey;
    }
    
    /**
     * Converts an address to a latitude longitude pair.
     * @param string $address The address to geocode
     * @throws \Exception cURL must be enabled to use this feature
     * @throws \Exception Failed to parse JSON response
     * @throws \Exception Failed to geocode address for reason given by Google
     * @return object An object with the lat and lng of the first coordinate pair returned by Google
     */
    public function getLatLngFromAddress($address)
    {
        if(!function_exists('\curl_init'))
            throw new \Exception('cURL must be enabled to use this feature');
        
        $url = 'https://maps.googleapis.com/maps/api/geocode/json?address=' . urlencode($address) . '&key=' . urlencode($this->apiKey) . '&sensor=false';
        
        $ch = curl_init($url);
        
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_REFERER, $_SERVER['HTTP_HOST']);
        
        $result = curl_exec($ch);
        
        $json = json_decode($result);

        do_action( 'wpgmza_google_maps_geocoded_result', $json );
        
        if(!$json)
        {
            $urlWithKeyHidden = preg_replace('/key=[A-Za-z0-9_\-]+/', '[api key]', $url);
            throw new \Exception("Failed to parse JSON response from $urlWithKeyHidden: " . $result . " (cURL error: " . curl_error($ch) . ")");
        }
        
        if(!property_exists($json, 'results'))
            throw new \Exception('Failed to geocode address "'.$address.'": ' . print_r($json, true));
        
        if($json->status != "OK")
            throw new \Exception('Failed to geocode address: "' . $address . '"');
        
        if(empty($json->results))
            return false;
        
        $result = $json->results[0];
        
        $location = $result->geometry->location;

        do_action( 'wpgmza_google_maps_geocoded_result_location', $location );
        
        return (object)array(
            'lat' => $location->lat, 
            'lng' => $location->lng
        );
    }
}

?>