<?php

namespace App\Service;

use GuzzleHttp\Client as GuzzleClient;
use CrEOF\Spatial\PHP\Types\Geometry\Point;

use Doctrine\ORM\EntityManagerInterface;

class MapTools
{
    const URL_DISTANCE_MATRIX       = 'https://maps.googleapis.com/maps/api/distancematrix/json';

    // entity manager
    protected $em;

    // google maps api key
    protected $gmaps_api_key;

    // customer distance limit
    protected $cust_dist_limit;

    public function __construct(EntityManagerInterface $em, $gmaps_api_key,
                                $cust_dist_limit)
    {
        $this->em = $em;
        $this->gmaps_api_key = $gmaps_api_key;
        $this->cust_dist_limit = $cust_dist_limit;
    }

    protected function mapGetDistances(Point $point, $hubs)
    {
        $client = new GuzzleClient();

        // origins
        $origins_value = $point->getLatitude() . ',' . $point->getLongitude();

        // destinations
        $dests = [];
        foreach ($hubs as $hub)
        {
            $coord = $hub->getCoordinates();
            $dests[] = round($coord->getLatitude(),5) . ',' . round($point->getLongitude(), 5);
        }
        $dests_value = implode('|', $dests);

        // google maps url
        $maps_url = self::URL_DISTANCE_MATRIX;

        // parameters
        $gmaps_params = [
            'origins' => $origins_value,
            'destinations' => $dests_value,
        ];

        //error_log(print_r($gmaps_params, true));


        // query google maps api
        $res = $client->request('GET', $maps_url, [
            'query' => $gmaps_params,
            'curl' => [
                CURLOPT_IPRESOLVE => CURL_IPRESOLVE_V4
            ],
        ]);

        return $res->getBody();
    }

    public function getClosestHubs(Point $point, $limit, $time = false)
    {
        // get closest hubs based on st_distance function from db
        $query = $this->em->createQuery('SELECT h, st_distance(h.coordinates, point(:lng, :lat)) as dist FROM App\Entity\Hub h' . ($time ? ' WHERE :time BETWEEN h.time_open AND h.time_close' : '') . ' ORDER BY dist')
            ->setParameter('lat', $point->getLatitude())
            ->setParameter('lng', $point->getLongitude());

        if ($time) {
            $query->setParameter('time', $time);
        }

        $query->setMaxResults($limit);

        // error_log($query->getSql());
        $result = $query->getResult();

        $hubs = [];
        $final_data = [];
        foreach ($result as $row)
        {
            //error_log($row[0]->getName() . ' - ' . $row['dist']);
            $hubs[] = $row[0];

            // get coordinates of hub
            $hub_coordinates = $row[0]->getCoordinates();

            $cust_lat = $point->getLatitude();
            $cust_lng = $point->getLongitude();

            $hub_lat = $hub_coordinates->getLatitude();
            $hub_lng = $hub_coordinates->getLongitude();

            // get distance in kilometers from customer point to hub point
            $dist = $this->distance($cust_lat, $cust_lng, $hub_lat, $hub_lng);

            $final_data[] = [
                'hub' => $row[0],
                'db_distance' => $row['dist'],
                'distance' => $dist,
                'duration' => 0,
            ];
        }

        return $final_data;

        /*
        // get actual distance details with eta from google maps api
        $raw_res = $this->mapGetDistances($point, $hubs);
        $res = json_decode($raw_res, true);
        //error_log(print_r($res, true));

        // check if status is ok
        if ($res['status'] != 'OK')
        {
            return $final_data;
            // error_log('status not ok');
        }

        // check that the elements array is there
        if (!isset($res['rows'][0]['elements']))
        {
            // error_log('no elements');
            return $final_data;
        }
                
        foreach($res['rows'][0]['elements'] as $index => $gm_row)
        {
            // check status
            if (isset($gm_row['status']) && $gm_row['status'] != 'OK')
            {
                // error_log('element row status not ok');
                continue;
            }

            // set distance
            if (isset($gm_row['distance']['value']))
                $final_data[$index]['distance'] = $gm_row['distance']['value'];

            // set duration
            if (isset($gm_row['duration']['value']))
                $final_data[$index]['duration'] = $gm_row['duration']['value'];
        }

        return $final_data;
        */
    }
   
    // NOTE: only the API calls this 
    public function getClosestOpenHubs(Point $point, $limit, $time = false)
    {
        // get closest hubs based on st_distance function from db
        $query = $this->em->createQuery('SELECT h, st_distance(h.coordinates, point(:lng, :lat)) as dist FROM App\Entity\Hub h' . ($time ? ' WHERE h.status_open = true AND :time BETWEEN h.time_open AND h.time_close' : '') . ' ORDER BY dist')
            ->setParameter('lat', $point->getLatitude())
            ->setParameter('lng', $point->getLongitude());

        if ($time) {
            $query->setParameter('time', $time);
        }

        $query->setMaxResults($limit);

        // error_log($query->getSql());
        $result = $query->getResult();

        $hubs = [];
        $final_data = [];
        foreach ($result as $row)
        {
            //error_log($row[0]->getName() . ' - ' . $row['dist']);
            $hubs[] = $row[0];

            // get coordinates of hub
            $hub_coordinates = $row[0]->getCoordinates();

            $cust_lat = $point->getLatitude();
            $cust_lng = $point->getLongitude();

            $hub_lat = $hub_coordinates->getLatitude();
            $hub_lng = $hub_coordinates->getLongitude();

            // get distance in kilometers from customer point to hub point
            $dist = $this->distance($cust_lat, $cust_lng, $hub_lat, $hub_lng);

            if ($dist < $this->cust_dist_limit)
            {
                $final_data[] = [
                    'hub' => $row[0],
                    'db_distance' => $row['dist'],
                    'distance' => $dist,
                    'duration' => 0,
                ];
            }
        }

        error_log('nearest open hubs count: ' . count($final_data));
        return $final_data;
    }

    protected function distance($lat1, $lon1, $lat2, $lon2) 
    {
        if (($lat1 == $lat2) && ($lon1 == $lon2)) 
            return 0;
    
        $theta = $lon1 - $lon2;
        $dist = sin(deg2rad($lat1)) * sin(deg2rad($lat2)) +  cos(deg2rad($lat1)) * cos(deg2rad($lat2)) * cos(deg2rad($theta));
        $dist = acos($dist);
        $dist = rad2deg($dist);
        $miles = $dist * 60 * 1.1515;

        return round(($miles * 1.609344), 1);
    }
}