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<?php
require_once 'vendor/autoload.php';
 
use transit_realtime\FeedMessage;
 
class IdMapper {
    private $jsonTrips = [];
    private $gtfsTrips = [];
    
    private $specialNames = [
        'Zjazd do zajezdni',
        'Przejazd techniczny',
        'Wyjazd na trasę',
    ];
    
    public static function convertTripId($tripId) {
        $tripId = explode('_', $tripId);
        if($tripId[0] != 'block') return;
        if($tripId[2] != 'trip') return;
        return 4096 * (int)$tripId[1] + (int)$tripId[3];
    }
    
    public function loadJson($file) {
        $json = json_decode(file_get_contents($file));
        foreach($json->vehicles as $vehicle) {
            if(isset($vehicle->isDeleted) && $vehicle->isDeleted) continue;
            if(!isset($vehicle->tripId) || !$vehicle->tripId) continue;
            if(!isset($vehicle->name) || !$vehicle->name) continue;
            if(!isset($vehicle->latitude) || !$vehicle->latitude) continue;
            if(!isset($vehicle->longitude) || !$vehicle->longitude) continue;
            foreach($this->specialNames as $name) {
                if(substr($vehicle->name, -strlen($name)) == $name) {
                    continue;
                }
            }
            $this->jsonTrips[(int)$vehicle->tripId] = [
                'id' => $vehicle->id,
                'latitude' => (float)$vehicle->latitude / 3600000.0,
                'longitude' => (float)$vehicle->longitude / 3600000.0,
            ];
        }
        ksort($this->jsonTrips);
    }
    
    public function loadGtfs($file) {
        $data = file_get_contents($file);
        $feed = new FeedMessage();
        $feed->parse($data);
        foreach ($feed->getEntityList() as $entity) {
            $vehiclePosition = $entity->getVehicle();
            $position = $vehiclePosition->getPosition();
            $vehicle = $vehiclePosition->getVehicle();
            $trip = $vehiclePosition->getTrip();
            $tripId = $trip->getTripId();
            $this->gtfsTrips[self::convertTripId($tripId)] = [
                'num' => $vehicle->getLicensePlate(),
                'tripId' => $tripId,
                'latitude' => $position->getLatitude(),
                'longitude' => $position->getLongitude(),
            ];
        }
        ksort($this->gtfsTrips);
    }
    
    public function findOffset() {
        if(count($this->jsonTrips) == 0 || count($this->gtfsTrips) == 0) {
            return NULL;
        }
        
        $jsonTripIds = array_keys($this->jsonTrips);
        $gtfsTripIds = array_keys($this->gtfsTrips);
        
        $possibleOffsets = [];
        for($i = 0; $i < count($this->jsonTrips); $i++) {
            for($j = 0; $j < count($this->gtfsTrips); $j++) {
                $possibleOffsets[$jsonTripIds[$i] - $gtfsTripIds[$j]] = TRUE;
            }
        }
        $possibleOffsets = array_keys($possibleOffsets);
        
        $bestOffset = 0;
        $maxMatched = 0;
        $options = 0;
        
        foreach($possibleOffsets as $offset) {
            $matched = 0;
            
            foreach($gtfsTripIds as $tripId) {
                $tripId += $offset;
                if(isset($this->jsonTrips[$tripId])) {
                    $matched++;
                }
            }
            
            if($matched > $maxMatched) {
                $bestOffset = $offset;
                $maxMatched = $matched;
                $options = 1;
            } elseif($matched == $maxMatched) {
                $options++;
            }
        }
        
        if($options != 1) {
            return FALSE;
        }
        return $bestOffset;
    }
    
    public function getMapping($offset) {
        $result = [];
        foreach($this->gtfsTrips as $gtfsTripId => $gtfsTrip) {
            $jsonTripId = $gtfsTripId + $offset;
            if(isset($this->jsonTrips[$jsonTripId])) {
                $result[$jsonTripId] = [
                    'num' => $gtfsTrip['num'],
                ];
            }
        }
        return $result;
    }
}
 
$mapper = new IdMapper();
$mapper->loadJson('./data/vehicles_A.json');
$mapper->loadGtfs('./data/VehiclePositions_A.pb');
$offset = $mapper->findOffset();
if($offset) {
    echo json_encode($mapper->getMapping($offset));
}