<?php

namespace MapBundle\Util;

class GeoDecode
{
    /**
     * Calcula la distancia cartografica (NO TOPOGRAFICA) entre 2 coordenadas.
     * @param $lat1
     * @param $lng1
     * @param $lat2
     * @param $lng2
     * @param bool $km Me dice si quiero la distancia en kilometros. Por defecto esta en metros.
     * @return float|int Retorna la distancia en metros
     */
    public function distanceGeoPoints($lat1, $lng1, $lat2, $lng2, $km = false)
    {
        // curvatura de la tierra
        $earthRadius = 3958.75;

        $dLat = deg2rad($lat2 - $lat1);
        $dLng = deg2rad($lng2 - $lng1);

        $a = sin($dLat / 2) * sin($dLat / 2) +
            cos(deg2rad($lat1)) * cos(deg2rad($lat2)) *
            sin($dLng / 2) * sin($dLng / 2);
        $c = 2 * atan2(sqrt($a), sqrt(1 - $a));
        $dist = $earthRadius * $c;

        // from miles
        $meterConversion = 1609;
        $geopointDistance = $dist * $meterConversion;

        return round(($km ? ($geopointDistance / 1000) : $geopointDistance), 3, PHP_ROUND_HALF_UP);
    }

    /**
     * Busca la latitud y longitud de acuerdo a la direccion que se pasa como parametro.
     * @param string $address Contiene la direccion.
     * @param string $city Contiene la ciudad.
     * @param string $state Contiene la  provincia.
     * @param string $country Contiene el pais.
     * @param string $region Contiene el codigo de la region.
     * @return array Retorna un array con la latitud y longitud.
     */
    public function searchLatLng($address, $city, $state, $country, $region)
    {

        $url = "http://maps.google.com/maps/api/geocode/json?";
        $add = "address=" . $address . "," . $city . "," . $state . "," . $country;
        $add .= "&components=country:" . $region;
        $arrAddress = explode(" ", $add);
        $address = implode("+", $arrAddress);
        $url .= $address;
        $nc = 0;
        while ($nc < 5) {
            $json = $this->curl($url);
            if (strtoupper($json['status']) == 'OVER_QUERY_LIMIT') {
                sleep(1);
            } else if (strtoupper($json['status']) == 'ZERO_RESULTS') {
                break;
            } else if (strtoupper($json['status']) == 'OK') {
                break;
            }
            $nc++;
        }
        if (isset($json['results']) &&
            isset($json['results'][0]) &&
            isset($json['results'][0]['geometry']) &&
            isset($json['results'][0]['geometry']['location']) &&
            isset($json['results'][0]['geometry']['location']['lat']) &&
            isset($json['results'][0]['geometry']['location']['lng'])
        ) {
            return ['address' => $address,
                'lat' => $json['results'][0]['geometry']['location']['lat'],
                'lng' => $json['results'][0]['geometry']['location']['lng']];
        } else {
            return null;
        }
    }

    /**
     * @param string $url Contiene la url a buscar.
     * @return mixed Retorna un array con los datos del json.
     */
    private function curl($url)
    {
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_URL, $url);
        $result = curl_exec($ch);

        return json_decode($result, true);
    }
}