make it work for my tram board

adds webserer with endpoint /line?number=3

you need to specify a post body text using b64-encoded, semicolon-separated names of the stops

index of stop name corresponds to returned value (led index)

cmd/tracker/main.go

@@ -1,37 +1,62 @@
 package main
 
 import (
+	// "fmt"
 	"log"
-	"shellixa/puvetra/internal/maps"
+	// "maps"
+	trmaps "shellixa/puvetra/internal/maps"
 	"shellixa/puvetra/internal/types"
+	/*"slices"
+	"strings" */
+	"time"
 )
 
 func main() {
 
 	log.Printf("Starting up..\n")
-	trips := maps.GetTrips()
+	trams := trmaps.GetTrips()
 
 	var allTrams []types.MapTrip
 
-	for _, t := range trips {
+	for _, t := range trams {
-		if t.Mode == "TRAM" {
+		if t.Mode == "TRAM" && t.Trips[0].RouteShortName == "3" {
 			allTrams = append(allTrams, t)
 		}
 	}
 
-	var traminfo []map[string]string
+	var traminfo = make(map[string]types.MapTrip)
 
+	now := time.Now()
 	for _, tr := range allTrams {
-		data := map[string]string{}
+		// Überschreibe [tripId] nur, wenn (OR)
-		data["line"] = tr.Trips[0].RouteShortName
+		// - [tripId] == nil
-		data["currentStation"] = tr.From.Name
+		// - departure < now && arrival > [tripId].departure
-		data["nextStation"] = tr.To.Name
+		storedTram := traminfo[tr.Trips[0].TripId]
-		data["departure"] = tr.Departure
+
-		data["arrival"] = tr.Arrival
+		if tr.Departure.Sub(now).Abs() < storedTram.Departure.Sub(now).Abs() {
-		traminfo = append(traminfo, data)
+			// Current is past now, Stored is future now
+			traminfo[tr.Trips[0].TripId] = tr
+		}
 	}
 
 	log.Printf("%+v\n", traminfo)
 	log.Printf("%d", len(traminfo))
-}
+	/*
 
+	   activeLights := make(map[int]bool)
+
+	   	for _, tram := range allTrams {
+	   		// Calculate current Station name depending on current time
+	   		realStation := tram.From
+	   		if now.Sub(depTime) > arrTime.Sub(now) {
+	   			//		log.Printf(">  %v, %v\n", now.Sub(tram.Departure), tram.Arrival.Sub(now))
+	   			realStation = tram.To
+	   		}
+	   		// log.Printf("From='%s' To='%s' Real='%s'\n", tram.From.Name, tram.To.Name, realStation.Name)
+	   		activeLights[stationLookupTable[strings.ToLower(realStation.Name)]] = true
+
+	   }
+
+	   fmt.Println(slices.Collect(maps.Keys(activeLights)))
+	*/
+}

cmd/web/main.go

@@ -0,0 +1,98 @@
+package main
+
+import (
+	"encoding/base64"
+	"encoding/json"
+	"io"
+	"log"
+	"maps"
+	"net/http"
+	trmaps "shellixa/puvetra/internal/maps"
+	"shellixa/puvetra/internal/types"
+	"slices"
+	"strings"
+	"time"
+)
+
+func main() {
+
+	mux := http.NewServeMux()
+
+	server := &http.Server{
+		Handler: mux,
+		Addr:    ":8080",
+	}
+
+	mux.HandleFunc("POST /line", GetLineTrams)
+
+	err := server.ListenAndServe()
+	if err != nil {
+		log.Println(err)
+	}
+}
+
+func GetLineTrams(w http.ResponseWriter, r *http.Request) {
+
+	// log.Printf("%+v\n", r)
+	b64Body := base64.NewDecoder(base64.StdEncoding, r.Body)
+	defer r.Body.Close()
+
+	body, _ := io.ReadAll(b64Body)
+
+	stationSeq := strings.Split(string(body), ";")
+
+	tramLine := r.URL.Query().Get("number")
+
+	trams := trmaps.GetTrips()
+
+	var allTrams []types.MapTrip
+
+	for _, t := range trams {
+		if t.Mode == "TRAM" && t.Trips[0].RouteShortName == tramLine {
+			allTrams = append(allTrams, t)
+		}
+	}
+
+
+	var traminfo = make(map[string]types.MapTrip)
+
+	now := time.Now()
+	for _, tr := range allTrams {
+		// Überschreibe [tripId] nur, wenn (OR)
+		// - [tripId] == nil
+		// - departure < now && arrival > [tripId].departure
+		storedTram := traminfo[tr.Trips[0].TripId]
+
+		if tr.Departure.Sub(now).Abs() < storedTram.Departure.Sub(now).Abs() {
+			// Current is past now, Stored is future now
+			traminfo[tr.Trips[0].TripId] = tr
+		}
+	}
+
+	stationLookupTable := make(map[string]int)
+	for i, v := range stationSeq {
+		stationLookupTable[strings.ToLower(v)] = i
+	}
+
+	activeLights := make(map[int]bool)
+	for _, tram := range slices.Collect(maps.Values(traminfo)) {
+		// Calculate current Station name depending on current time
+		realStation := tram.From
+		if tram.Departure.Sub(now).Abs() > tram.Arrival.Sub(now).Abs() {
+			//		log.Printf(">  %v, %v\n", now.Sub(depTime), arrTime.Sub(now))
+			realStation = tram.To
+		}
+		// log.Printf("From='%s' To='%s' Real='%s'\n", tram.From.Name, tram.To.Name, realStation.Name)
+		activeLights[stationLookupTable[strings.ToLower(realStation.Name)]] = true
+
+	}
+
+	lightIds := slices.Collect(maps.Keys(activeLights))
+	// log.Println(lightIds)
+
+	enc := json.NewEncoder(w)
+	err := enc.Encode(lightIds)
+	if err != nil {
+		log.Println(err)
+	}
+}

internal/maps/trips.go

@@ -2,6 +2,7 @@ package maps
 
 import (
 	"encoding/json"
+	"io"
 	"log"
 	"net/http"
 	"shellixa/puvetra/internal/types"
@@ -16,9 +17,12 @@ func GetTrips() []types.MapTrip {
 	}
 	q := req.URL.Query()
 
-	now := time.Now().Format(time.RFC3339)
+	now := time.Now()
-  q.Add("startTime", now)
+	delta := time.Minute * 5
-  q.Add("endTime", now)
+	lowerBound := now.Add(-delta).Format(time.RFC3339)
+	upperBound := now.Add(delta).Format(time.RFC3339)
+  q.Add("startTime", lowerBound)
+  q.Add("endTime", upperBound)
 	q.Add("min", "51.1626,13.5609")
 	q.Add("max", "50.9973,13.8596")
 	q.Add("zoom", "14")
@@ -34,9 +38,11 @@ func GetTrips() []types.MapTrip {
 	defer response.Body.Close()
 
 	var trips []types.MapTrip 
-	if err := json.NewDecoder(response.Body).Decode(&trips); err != nil {
+	buffer, _ := io.ReadAll(response.Body)
+	if err = json.Unmarshal(buffer, &trips); err != nil {
 		log.Fatal(err)
 	}
+	log.Printf("component='Transitous API' message='Response was %d bytes'", len(buffer))
 
 	return trips
 

internal/timetable/trips.go

@@ -0,0 +1,34 @@
+package timetable
+
+import (
+	"encoding/json"
+	"fmt"
+	"log"
+	"net/http"
+	"shellixa/puvetra/internal/types"
+)
+
+func GetTrip(tripId string) types.Trip {
+	client := http.Client{}
+	url := fmt.Sprintf("https://api.transitous.org/api/v6/trip?tripId=%s", tripId)
+	req, err := http.NewRequest("GET", url, nil)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	response, err := client.Do(req)
+
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	defer response.Body.Close()
+
+	var trip types.Trip
+	if err := json.NewDecoder(response.Body).Decode(&trip); err != nil {
+		log.Fatal(err)
+	}
+
+	return trip
+
+}

internal/types/types.go

@@ -1,5 +1,7 @@
 package types
 
+import "time"
+
 
 type TripMeta struct {
 	TripId string
@@ -12,20 +14,20 @@ type MapTrip struct {
 	RouteColor string
 	Mode string
 	Distance float32
-	Departure string
+	Departure time.Time 
-	Arrival string
+	Arrival time.Time
 	From Place
 	To Place
-	ScheduledDeparture string
+	ScheduledDeparture time.Time
-	ScheduledArrival string
+	ScheduledArrival time.Time
 	RealTime bool
 	Polyline string
 }
 
 type Trip struct {
 	Duration int64
-	StartTime string
+	StartTime time.Time
-	EndTine string
+	EndTine time.Time
 	Transfers int
 	Id string
 	Legs []TripLeg
@@ -36,10 +38,10 @@ type TripLeg struct {
 	From Place
 	To Place
 	Duration int64
-	StartTime string
+	StartTime time.Time
-	EndTime string
+	EndTime time.Time
-	ScheduledStartTime string
+	ScheduledStartTime time.Time
-	ScheduledEndTime string
+	ScheduledEndTime time.Time
 	RealTime bool
 	Scheduled bool
 	Distance float32
@@ -53,8 +55,8 @@ type Place struct {
 	StopId string
 	Lat float32
 	Lon float32
-	Arrival string
+	Arrival time.Time
-	Departure string
+	Departure time.Time
 	Track string
 	StopCode string
 	Description string