<?php
 
/*
 *    Copyright 2010,2011 Alexander Sadleir 
 
  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at
 
  http://www.apache.org/licenses/LICENSE-2.0
 
  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
 */
include ('../include/common.inc.php');
include_header("MyWay Delta Calculate", "mywayDeltaCalc");
flush();
ob_flush();
 
function abssort($a, $b) {
    if ($a['timeDiff'] == $b['timeDiff']) {
        return 0;
    }
    return (abs($a['timeDiff']) < abs($b['timeDiff'])) ? -1 : 1;
}
 
//collect all observation not in delta
$query = "select * from myway_observations INNER JOIN myway_stops
ON myway_observations.myway_stop=myway_stops.myway_stop 
 WHERE observation_id NOT IN
(
SELECT  observation_id
FROM myway_timingdeltas
)";
debug($query, "database");
$query = $conn->prepare($query);
$query->execute();
if (!$query) {
    databaseError($conn->errorInfo());
    return Array();
}
$uncalcdObservations = $query->fetchAll();
//Display count
echo "<h3>" . sizeof($uncalcdObservations) . " observations not yet processed</h2>";
//foreach observation not in delta
foreach ($uncalcdObservations as $obsv) {
    //var_dump($obsv);
    echo "<h3>Observation {$obsv['observation_id']}:</h1>
<small>{$obsv['myway_stop']} @ {$obsv['time']} on {$obsv['myway_route']}</small><br>";
    // convert timestamp into time of day and date
// timezones from http://www.postgresql.org/docs/8.0/static/datetime-keywords.html
    $time = date("H:i:s", strtotime($obsv['time']));
    $time_tz = date("H:i:s", strtotime($obsv['time'])) . " AESST";
    $search_time = date("H:i:s", strtotime($obsv['time']) - (30 * 60)); // 30 minutes margin
    $date = date("c", strtotime($obsv['time']));
    $timing_period = service_period(strtotime($date));
    if (isset($obsv["stop_id"]) && $obsv["stop_id"] != "" ) {
    $potentialStops = Array(getStop($obsv["stop_id"]));
    } else {
        echo "Potential stops are a bus station<br>";
        $potentialStops = getStops("",  trim(str_replace(Array("Arrival","Arrivals","Arrive Platform 3 Set down only.","Arrive","Set Down Only"), "", $obsv["myway_stop"])));
    }
    //:get myway_stops records
    //:search by starts with stopcode and starts with street if street is not null
    //no result, skip and display error
    if (sizeof($potentialStops) < 1) {
        echo "error, potential stops for stopid {$obsv["stop_id"]} unknown";
        continue;
    }
    //print out stops
    echo "Matched stops: ";
    foreach ($potentialStops as $potentialStop) {
        echo $potentialStop['stop_id'] . " " . $potentialStop['stop_name'] . " ";
    }
    echo "<br>";
    //:get myway_route record
    //no result, skip and display error
    //print out route
    $potentialRoutes = getRoutesByShortName(preg_replace("/[A-Z]/", "", $obsv["myway_route"]));
    if (sizeof($potentialRoutes) < 1) {
        echo "error, route '{$obsv["myway_route"]}' unknown";
        continue;
    }
    $timeDeltas = Array();
    foreach ($potentialRoutes as $potentialRoute) {
        echo "Matched route: {$potentialRoute['route_id']} {$potentialRoute['route_short_name']}{$potentialRoute['route_long_name']} {$timing_period}<br>";
        foreach ($potentialStops as $potentialStop) {
            $stopRoutes = getStopRoutes($potentialStop['stop_id'], $timing_period);
            $foundRoute = Array();
            foreach ($stopRoutes as $stopRoute) {
                //Check if this route stops at each stop
                if ($stopRoute['route_id'] == $potentialRoute['route_id']) {
                    echo "Matching route {$stopRoute['route_id']} found at stop #{$potentialStop['stop_id']}<br>";
                    $foundRoute = $stopRoute;
                    //if does get tripstoptimes for this route
                    $trips = getStopTrips($potentialStop['stop_id'], $timing_period, $search_time);
                    foreach ($trips as $trip) {
                        //echo $trip['route_id']." ".$stopRoute['route_id'].";";
                        if ($trip['route_id'] == $stopRoute['route_id']) {
                            $timedTrip = getTripAtStop($trip['trip_id'], $trip['stop_sequence']);
                            $actual_time = strtotime($time);
                            $trip_time = strtotime($timedTrip['arrival_time']);
                            $timeDiff = $actual_time - $trip_time;
                            //work out time delta, put into array with index of delta
                            $timeDeltas[] = Array(
                                "timeDiff" => $timeDiff,
                                "stop_id" => $potentialStop['stop_id'],
                                "stop_sequence" => $trip['stop_sequence'],
                                "route_name" => "{$potentialRoute['route_short_name']} {$potentialRoute['route_long_name']} {$trip['direction']}",
                                "route_id" => $trip['route_id']
                            );
                            echo "Found trip {$trip['trip_id']} at stop {$potentialStop['stop_id']} (#{$potentialStop['stop_name']}, sequence #{$trip['stop_sequence']})<br>";
                            echo "Arriving at {$timedTrip['arrival_time']}, difference of " . round($timeDiff / 60, 2) . " minutes<br>";
                        }
                    }
                    break; // because have found route
                }
            }
            if (sizeof($foundRoute) < 1) {
                //print out that stops/does not stop
                echo "No matching routes found at {$potentialStop['stop_id']}<br>";
                //var_dump($stopRoutes);
                flush();
            }
        }
    }
    
    //   lowest delta is recorded delta
    usort($timeDeltas, "abssort");
    $lowestDelta = $timeDeltas[0]["timeDiff"];
    if (sizeof($timeDeltas) != 0) {
        if (abs($lowestDelta) > 9999) {
             echo "Difference of " . round($lowestDelta / 60, 2) . " minutes is too high. Will not record this observation<br>";
        } else {
        echo "Lowest difference of " . round($lowestDelta / 60, 2) . " minutes will be recorded for this observation<br>";
        
        $observation_id = $obsv['observation_id'];
        
        $route_name = $timeDeltas[0]["route_name"];
        $route_id = $timeDeltas[0]["route_id"];
        $stop_id = $timeDeltas[0]["stop_id"];
        $myway_stop = $obsv["myway_stop"];
        $stop_sequence = $timeDeltas[0]["stop_sequence"];
        $stmt = $conn->prepare("insert into myway_timingdeltas (observation_id, route_id, stop_id, timing_delta, time, date, timing_period, stop_sequence,myway_stop,route_name)
                                      values (:observation_id, :route_id, :stop_id, :timing_delta, :time, :date, :timing_period, :stop_sequence,:myway_stop,:route_name)");
        $stmt->bindParam(':observation_id', $observation_id);
        $stmt->bindParam(':route_id', $route_id);
        $stmt->bindParam(':route_name', $route_name);
        $stmt->bindParam(':stop_id', $stop_id);
        $stmt->bindParam(':myway_stop', $myway_stop);
        $stmt->bindParam(':timing_delta', $lowestDelta);
        $stmt->bindParam(':time', $time_tz);
        $stmt->bindParam(':date', $date);
        $stmt->bindParam(':timing_period', $timing_period);
        $stmt->bindParam(':stop_sequence', $stop_sequence);
        // insert a record
        $stmt->execute();
        if ($stmt->rowCount() > 0) {
            echo "Recorded.<br>";
        }
        var_dump($conn->errorInfo());
        flush();
        }
    }
    flush();
}