/* Generates predicted joruney times based on historic average and real time measurements */
func getPredictedJourneyTime(stopPoints []string) (time.Duration, error) {
adjacentStops := make(map[string]map[string]bool)
for i := 0; i < len(stopPoints)-1; i++ {
fromStop := stopPoints[i]
toStop := stopPoints[i+1]
fromStopMap, fromStopExists := adjacentStops[fromStop]
if !fromStopExists {
fromStopMap = make(map[string]bool)
}
fromStopMap[toStop] = true
adjacentStops[fromStop] = fromStopMap
}
currentEstimates, _, _, _, _, err := selectdb.SelectCurrentEstimates(adjacentStops)
if err != nil {
return 0, err
}
counterInit := time.Time{}
counter := counterInit
for _, details := range currentEstimates {
for _, duration := range details {
counter = counter.Add(duration)
}
}
return counter.Sub(counterInit), nil
}
/* Returns our prediction of how long it takes (mixed/historic/real time) for a given line to travel from a stop to another */
func updateBusPrediction(line, bound string, intermediateStopsOrdered []string, departureTime time.Time) (time.Duration, time.Duration, time.Duration, map[string]map[string]time.Duration, error) {
intermediateStops := make(map[string]map[string]bool)
for i := 0; i < len(intermediateStopsOrdered)-1; i++ {
fromStop := intermediateStopsOrdered[i]
toStop := intermediateStopsOrdered[i+1]
intermediateStops[fromStop] = map[string]bool{
toStop: true,
}
}
/* Short circut if departure time is found to be recent, and use current_estimates instead */
if departureTime.Before(time.Now().Add(time.Hour)) {
logger.GetLogger().Info("Case 1")
_, historicEstimates, realTimeEstimates, expectedLastingTimes, delayCounts, err := selectdb.SelectCurrentEstimates(intermediateStops)
prediction := time.Duration(0)
historicPrediction := time.Duration(0)
realTimePrediction := time.Duration(0)
predictionAdjacentStops := make(map[string]map[string]time.Duration)
for i := 0; i < len(intermediateStopsOrdered)-1; i++ {
fromStop := intermediateStopsOrdered[i]
toStop := intermediateStopsOrdered[i+1]
expectedLastingTime := expectedLastingTimes[fromStop][toStop]
delayCount := delayCounts[fromStop][toStop]
var estimate time.Duration
if delayCount >= 3 ||
time.Now().Add(expectedLastingTime).After(departureTime.Add(prediction)) {
estimate = realTimeEstimates[fromStop][toStop]
} else {
estimate = historicEstimates[fromStop][toStop]
}
prediction += estimate
historicPrediction += historicEstimates[fromStop][toStop]
realTimePrediction += realTimeEstimates[fromStop][toStop]
predictionAdjacentStops[fromStop] = map[string]time.Duration{
toStop: estimate,
}
}
return prediction, historicPrediction, realTimePrediction, predictionAdjacentStops, err
} else {
logger.GetLogger().Info("Case 2")
estimates2, historicEstimates2, realTimeEstimates2, err := performanceeval.PredictJourneyWithMixedData(performanceeval.DefaultMethod(), line, bound, intermediateStops, intermediateStopsOrdered, departureTime)
if err != nil {
return 0, 0, 0, nil, err
}
/* Convert data structures */
estimates := castEstimates(estimates2)
historicEstimates := castEstimates(historicEstimates2)
realTimeEstimates := castEstimates(realTimeEstimates2)
prediction := time.Duration(0)
historicPrediction := time.Duration(0)
realTimePrediction := time.Duration(0)
predictionAdjacentStops := make(map[string]map[string]time.Duration)
for i := 0; i < len(intermediateStopsOrdered)-1; i++ {
fromStop := intermediateStopsOrdered[i]
toStop := intermediateStopsOrdered[i+1]
historicPrediction += historicEstimates[fromStop][toStop]
realTimePrediction += realTimeEstimates[fromStop][toStop]
prediction += estimates[fromStop][toStop]
predictionAdjacentStops[fromStop] = map[string]time.Duration{
toStop: estimates[fromStop][toStop],
}
}
return prediction, historicPrediction, realTimePrediction, predictionAdjacentStops, err
}
}
/* Get durations, historic and real time for all routes
map (line =>
(bound =>
("duration" => duration
"historicDuration" => historic duration
"realTimeDuration" => real time duration))) */
func getRouteDurations(lineBounds map[string]map[string]bool) map[string]map[string]map[string]time.Duration {
allLineStopPoints := selectdb.SelectMultipleLineStopPoints(lineBounds)
adjacentStops := extractAdjacentStops(allLineStopPoints)
currentEstimates, currentHistoricEstimates, currentRealTimeEstimates, _, delayCounts, _ := selectdb.SelectCurrentEstimates(adjacentStops)
routeDurations := make(map[string]map[string]map[string]time.Duration)
for line, lineDetails := range lineBounds {
for bound, _ := range lineDetails {
duration, historicDuration, realTimeDuration, err := getRouteDuration(line, bound, allLineStopPoints[line][bound],
currentEstimates, currentHistoricEstimates, currentRealTimeEstimates, delayCounts)
if err != nil {
logger.GetLogger().Error("Failed to get route duartion for line %v (%v): %v", line, bound, err.Error())
continue
}
_, exists := routeDurations[line]
if !exists {
routeDurations[line] = make(map[string]map[string]time.Duration)
}
routeDurations[line][bound] = map[string]time.Duration{
"duration": duration,
"historicDuration": historicDuration,
"realTimeDuration": realTimeDuration,
}
}
}
return routeDurations
}
