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bus_arrival.go
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bus_arrival.go
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package main
import (
"fmt"
"log"
"os"
"strings"
"time"
"github.com/yi-jiayu/datamall/v3"
)
// Returns negative if arrival time is unknown
func getMinutesFromNow(arrivingBus datamall.ArrivingBus) float64 {
if arrivingBus.EstimatedArrival.IsZero() {
return -1
}
delta := arrivingBus.EstimatedArrival.Sub(time.Now()).Minutes()
if delta < 1 {
return 0
}
return delta
}
// NextBusMinutes, NextBusMinutes2, NextBusMinutes3 will contain negative value
// if arrival information is not available
type busArrivalInformation struct {
BusStopCode string
BusServiceNo string
NextBusMinutes float64
NextBusMinutes2 float64
NextBusMinutes3 float64
}
func (busArrivalInformation busArrivalInformation) toMessageString() string {
stringBuilder := strings.Builder{}
stringBuilder.WriteString(busArrivalInformation.BusServiceNo)
stringBuilder.WriteString(" @ ")
busStopDesc := refDataDB.GetBusStopByBusStopCode(busArrivalInformation.BusStopCode).Description
stringBuilder.WriteString(fmt.Sprintf("%s (%s)", busStopDesc, busArrivalInformation.BusStopCode))
stringBuilder.WriteString(" | ")
if busArrivalInformation.NextBusMinutes == 0 {
stringBuilder.WriteString("Arr")
} else {
stringBuilder.WriteString(fmt.Sprintf("%.0f mins", busArrivalInformation.NextBusMinutes))
}
if busArrivalInformation.NextBusMinutes2 > 0 {
stringBuilder.WriteString(" | ")
stringBuilder.WriteString(fmt.Sprintf("%.0f mins", busArrivalInformation.NextBusMinutes2))
}
if busArrivalInformation.NextBusMinutes3 > 0 {
stringBuilder.WriteString(" | ")
stringBuilder.WriteString(fmt.Sprintf("%.0f mins", busArrivalInformation.NextBusMinutes3))
}
return stringBuilder.String()
}
func fetchBusArrivalInformation(busStopCode string, busServiceNo string) busArrivalInformation {
ltaToken := os.Getenv("LTA_API_TOKEN")
apiClient := datamall.NewDefaultClient(ltaToken)
resPayload, err := apiClient.GetBusArrival(busStopCode, busServiceNo)
if err != nil {
log.Fatalln(err)
}
busArrivalInfo := busArrivalInformation{}
busArrivalInfo.BusStopCode = resPayload.BusStopCode
busArrivalInfo.BusServiceNo = resPayload.Services[0].ServiceNo
busArrivalInfo.NextBusMinutes = getMinutesFromNow(resPayload.Services[0].NextBus)
busArrivalInfo.NextBusMinutes2 = getMinutesFromNow(resPayload.Services[0].NextBus2)
busArrivalInfo.NextBusMinutes3 = getMinutesFromNow(resPayload.Services[0].NextBus3)
return busArrivalInfo
}