1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
<?php
require('vendor/autoload.php');
require('common.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)] = [
                'id' => $entity->getId(),
                '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($options != 1) {
            fwrite(STDERR, 'Found '.$options.' possible mappings!'."\n");
            return FALSE;
        }
        return $bestOffset;
    }
    
    public function getMapping($offset) {
        $result = [];
        foreach($this->gtfsTrips as $gtfsTripId => $gtfsTrip) {
            $jsonTripId = $gtfsTripId + $offset;
            if(isset($this->jsonTrips[$jsonTripId])) {
                $data = numToTypeB($gtfsTrip['id']);
                $num = $gtfsTrip['num'];
                if($data['num'] != $num) {
                    // Ignore due to incorrect depot markings in the data
                    //fwrite(STDERR, 'Got '.$num.', database has '.$data['num']."\n");
                }
                $result[$jsonTripId] = $data;
            }
        }
        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));
}