MyWay timeliness study data collection
[busui.git] / include / db / trip-dao.inc.php
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<?php
function getTrip($tripID)
{
        global $conn;
        $query = "Select * from trips
        join routes on trips.route_id = routes.route_id
        where trip_id = :tripID
        LIMIT 1";
        debug($query, "database");
        $query = $conn->prepare($query);
        $query->bindParam(":tripID", $tripID);
        $query->execute();
        if (!$query) {
                databaseError($conn->errorInfo());
                return Array();
        }
        return $query->fetch(PDO::FETCH_ASSOC);
}
function getTripShape($tripID)
{
        global $conn;
        $query = "SELECT ST_AsKML(ST_MakeLine(geometry(a.position))) as the_route
FROM (SELECT position,
        stop_sequence, trips.trip_id
FROM stop_times
join trips on trips.trip_id = stop_times.trip_id
join stops on stops.stop_id = stop_times.stop_id
WHERE trips.trip_id = :tripID ORDER BY stop_sequence) as a group by a.trip_id";
        debug($query, "database");
        $query = $conn->prepare($query);
        $query->bindParam(":tripID", $tripID);
        $query->execute();
        if (!$query) {
                databaseError($conn->errorInfo());
                return Array();
        }
        return $query->fetchColumn(0);
}
function getTimeInterpolatedTrip($tripID, $range = "")
{
        global $conn;
        $query = "SELECT stop_times.trip_id,arrival_time,stop_times.stop_id,stop_lat,stop_lon,stop_name,stop_code,
        stop_sequence,service_id,trips.route_id,route_short_name,route_long_name
FROM stop_times
join trips on trips.trip_id = stop_times.trip_id
join routes on trips.route_id = routes.route_id
join stops on stops.stop_id = stop_times.stop_id
WHERE trips.trip_id = :tripID $range ORDER BY stop_sequence";
        debug($query, "database");
        $query = $conn->prepare($query);
        $query->bindParam(":tripID", $tripID);
        $query->execute();
        if (!$query) {
                databaseError($conn->errorInfo());
                return Array();
        }
        $stopTimes = $query->fetchAll();
        $cur_timepoint = Array();
        $next_timepoint = Array();
        $distance_between_timepoints = 0.0;
        $distance_traveled_between_timepoints = 0.0;
        $rv = Array();
        foreach ($stopTimes as $i => $stopTime) {
                if ($stopTime['arrival_time'] != "") {
                        // is timepoint
                        $cur_timepoint = $stopTime;
                        $distance_between_timepoints = 0.0;
                        $distance_traveled_between_timepoints = 0.0;
                        if ($i + 1 < sizeof($stopTimes)) {
                                $k = $i + 1;
                                $distance_between_timepoints+= distance($stopTimes[$k - 1]["stop_lat"], $stopTimes[$k - 1]["stop_lon"], $stopTimes[$k]["stop_lat"], $stopTimes[$k]["stop_lon"]);
                                while ($stopTimes[$k]["arrival_time"] == "" && $k + 1 < sizeof($stopTimes)) {
                                        $k+= 1;
                                        //echo "k".$k;
                                        $distance_between_timepoints+= distance($stopTimes[$k - 1]["stop_lat"], $stopTimes[$k - 1]["stop_lon"], $stopTimes[$k]["stop_lat"], $stopTimes[$k]["stop_lon"]);
                                }
                                $next_timepoint = $stopTimes[$k];
                                $rv[] = $stopTime;
                        }
                }
                else {
                        // is untimed point
                        //echo "i".$i;
                        $distance_traveled_between_timepoints+= distance($stopTimes[$i - 1]["stop_lat"], $stopTimes[$i - 1]["stop_lon"], $stopTimes[$i]["stop_lat"], $stopTimes[$i]["stop_lon"]);
                        //echo "$distance_traveled_between_timepoints / $distance_between_timepoints<br>";
                        $distance_percent = $distance_traveled_between_timepoints / $distance_between_timepoints;
                        if ($next_timepoint["arrival_time"] != "") {
                                $total_time = strtotime($next_timepoint["arrival_time"]) - strtotime($cur_timepoint["arrival_time"]);
                                //echo strtotime($next_timepoint["arrival_time"])." - ".strtotime($cur_timepoint["arrival_time"])."<br>";
                                $time_estimate = ($distance_percent * $total_time) + strtotime($cur_timepoint["arrival_time"]);
                                $stopTime["arrival_time"] = date("H:i:s", $time_estimate);
                        }
                        else {
                                $stopTime["arrival_time"] = $cur_timepoint["arrival_time"];
                        }
                        $rv[] = $stopTime;
                        //var_dump($rv);
                        
                }
        }
        return $rv;
}
function getTripPreviousTimePoint($tripID, $stop_sequence)
{
        global $conn;
        $query = " SELECT trip_id,stop_id,
        stop_sequence
FROM stop_times
WHERE trip_id = :tripID and stop_sequence < :stop_sequence
and stop_times.arrival_time IS NOT NULL ORDER BY stop_sequence DESC LIMIT 1";
        debug($query, "database");
        $query = $conn->prepare($query);
        $query->bindParam(":tripID", $tripID);
        $query->bindParam(":stop_sequence", $stop_sequence);
        $query->execute();
        if (!$query) {
                databaseError($conn->errorInfo());
                return Array();
        }
        return $query->fetch(PDO::FETCH_ASSOC);
}
function getTripNextTimePoint($tripID, $stop_sequence)
{
        global $conn;
        $query = " SELECT trip_id,stop_id,
        stop_sequence
FROM stop_times
WHERE trip_id = :tripID and stop_sequence > :stop_sequence
and stop_times.arrival_time IS NOT NULL ORDER BY stop_sequence LIMIT 1";
        debug($query, "database");
        $query = $conn->prepare($query);
        $query->bindParam(":tripID", $tripID);
        $query->bindParam(":stop_sequence", $stop_sequence);
        $query->execute();
        if (!$query) {
                databaseError($conn->errorInfo());
                return Array();
        }
        return $query->fetch(PDO::FETCH_ASSOC);
}
function getTimeInterpolatedTripAtStop($tripID, $stop_sequence)
{
        global $conn;
        // limit interpolation to between nearest actual points.
        $prevTimePoint = getTripPreviousTimePoint($tripID, $stop_sequence);
        $nextTimePoint = getTripNextTimePoint($tripID, $stop_sequence);
        $range = "AND stop_sequence >= '{$prevTimePoint['stop_sequence']}' AND stop_sequence <= '{$nextTimePoint['stop_sequence']}'";
        foreach (getTimeInterpolatedTrip($tripID, $range) as $tripStop) {
                if ($tripStop['stop_sequence'] == $stop_sequence) return $tripStop;
        }
        return Array();
}
function getTripStartTime($tripID)
{
        global $conn;
        $query = "Select * from stop_times
        where trip_id = :tripID
        AND arrival_time IS NOT NULL
        AND stop_sequence = '1'";
        debug($query, "database");
        $query = $conn->prepare($query);
        $query->bindParam(":tripID", $tripID);
        $query->execute();
        if (!$query) {
                databaseError($conn->errorInfo());
                return Array();
        }
        $r = $query->fetch(PDO::FETCH_ASSOC);
        return $r['arrival_time'];
}
function getActiveTrips($time)
{
        global $conn;
        if ($time == "") $time = current_time();
        $query = "Select distinct stop_times.trip_id, start_times.arrival_time as start_time, end_times.arrival_time as end_time from stop_times, (SELECT trip_id,arrival_time from stop_times WHERE stop_times.arrival_time IS NOT NULL
AND stop_sequence = '1') as start_times, (SELECT trip_id,max(arrival_time) as arrival_time from stop_times WHERE stop_times.arrival_time IS NOT NULL group by trip_id) as end_times
WHERE start_times.trip_id = end_times.trip_id AND stop_times.trip_id = end_times.trip_id AND :time > start_times.arrival_time  AND :time < end_times.arrival_time";
        debug($query, "database");
        $query = $conn->prepare($query);
        $query->bindParam(":time", $time);
        $query->execute();
        if (!$query) {
                databaseError($conn->errorInfo());
                return Array();
        }
        return $query->fetchAll();
}
function viaPoints($tripID, $stop_sequence = "")
{
        global $conn;
        $query = "SELECT stops.stop_id, stop_name, arrival_time
FROM stop_times join stops on stops.stop_id = stop_times.stop_id
WHERE stop_times.trip_id = :tripID
" . ($stop_sequence != "" ? " AND stop_sequence > :stop_sequence " : "") . "AND substr(stop_code,1,2) != 'Wj' ORDER BY stop_sequence";
        debug($query, "database");
        $query = $conn->prepare($query);
        if ($stop_sequence != "") $query->bindParam(":stop_sequence", $stop_sequence);
        $query->bindParam(":tripID", $tripID);
        $query->execute();
        if (!$query) {
                databaseError($conn->errorInfo());
                return Array();
        }
        return $query->fetchAll();
}
function viaPointNames($tripid, $stop_sequence = "")
{
        $viaPointNames = Array();
        foreach (viaPoints($tripid, $stop_sequence) as $point) {
                $viaPointNames[] = $point['stop_name'];
        }
        if (sizeof($viaPointNames) > 0) {
                return r_implode(", ", $viaPointNames);
        }
        else {
                return "";
        }
}
?>