feat: implement two-location speed calculation when native speed unavailable

android/app/src/main/kotlin/dev/fiatcode/tracpulse/service/LocationTrackingService.kt

@@ -13,7 +13,9 @@ import android.net.ConnectivityManager
 import android.location.Location
 import android.os.Binder
 import android.os.Build
+import android.os.Handler
 import android.os.IBinder
+import android.os.Looper
 import android.os.PowerManager
 import androidx.core.app.NotificationCompat
 import dev.fiatcode.tracpulse.BridgeModule
@@ -57,6 +59,9 @@ class LocationTrackingService : Service() {
     private var bypassFilterOnce = false
 
     private var currentConfig: TrackingConfig? = null
+    private var pendingSpeedLocation: Location? = null
+    private var speedRequestPending = false
+    private val SPEED_CALC_DELAY_MS = 2500L
 
     inner class LocalBinder : Binder() {
         fun getService(): LocationTrackingService = this@LocationTrackingService
@@ -143,6 +148,8 @@ class LocationTrackingService : Service() {
 
         isTracking = true
         distanceFilterProcessor.reset()
+        pendingSpeedLocation = null
+        speedRequestPending = false
         prefs.edit().putBoolean("tracking_active", true).apply()
         Log.d(TAG, "startTracking: set tracking_active=true")
 
@@ -226,15 +233,22 @@ class LocationTrackingService : Service() {
         }
         bypassFilterOnce = false
 
+        val nativeSpeed = if (location.hasSpeed()) location.speed else null
+
+        if (nativeSpeed == null || nativeSpeed <= 0) {
+            pendingSpeedLocation = location
+            requestLocationForSpeedCalculation()
+        }
+
         val traccarLocation = TraccarLocation(
             timestamp = location.time,
             latitude = location.latitude,
             longitude = location.longitude,
             accuracy = if (location.hasAccuracy()) location.accuracy else null,
-            speed = if (location.hasSpeed()) location.speed else null,
+            speed = nativeSpeed,
             heading = if (location.hasBearing()) location.bearing else null,
             altitude = if (location.hasAltitude()) location.altitude else null,
-            isMoving = location.speed > 1.0f // Consider moving if speed > 1 m/s
+            isMoving = (nativeSpeed ?: 0f) > 1.0f
         )
 
         logEvent("LOCATION", "Lat: ${location.latitude}, Lon: ${location.longitude}, Speed: ${location.speed}")
@@ -262,12 +276,14 @@ class LocationTrackingService : Service() {
             apply()
         }
 
+        if (nativeSpeed != null && nativeSpeed > 0) {
             if (isNetworkAvailable) {
                 sendLocationToServer(traccarLocation)
             } else {
                 bufferLocation(traccarLocation)
             }
         }
+    }
 
     private fun onHeartbeat() {
         logEvent("HEARTBEAT", "Heartbeat fired")
@@ -276,6 +292,58 @@ class LocationTrackingService : Service() {
         }
     }
 
+    private fun requestLocationForSpeedCalculation() {
+        if (speedRequestPending) return
+
+        speedRequestPending = true
+        Handler(Looper.getMainLooper()).postDelayed({
+            fusedLocationProvider.getLastLocation { location ->
+                location?.let {
+                    val calculatedSpeed = distanceFilterProcessor.getCalculatedSpeed(it)
+                    onSpeedLocationReceived(it, calculatedSpeed)
+                }
+                speedRequestPending = false
+                pendingSpeedLocation = null
+            }
+        }, SPEED_CALC_DELAY_MS)
+    }
+
+    private fun onSpeedLocationReceived(location: Location, calculatedSpeed: Float?) {
+        val config = currentConfig ?: return
+
+        val finalSpeed = if (location.hasSpeed() && location.speed > 0) {
+            location.speed
+        } else {
+            calculatedSpeed
+        }
+
+        if (finalSpeed == null || finalSpeed <= 0) {
+            logEvent("SPEED_CALC", "Speed calculation failed - insufficient data")
+            return
+        }
+
+        val traccarLocation = TraccarLocation(
+            timestamp = location.time,
+            latitude = location.latitude,
+            longitude = location.longitude,
+            accuracy = if (location.hasAccuracy()) location.accuracy else null,
+            speed = finalSpeed,
+            heading = if (location.hasBearing()) location.bearing else null,
+            altitude = if (location.hasAltitude()) location.altitude else null,
+            isMoving = finalSpeed > 1.0f
+        )
+
+        logEvent("LOCATION", "Lat: ${location.latitude}, Lon: ${location.longitude}, Calc Speed: ${finalSpeed}")
+
+        updateNotificationSpeed(location, finalSpeed)
+
+        if (isNetworkAvailable) {
+            sendLocationToServer(traccarLocation)
+        } else {
+            bufferLocation(traccarLocation)
+        }
+    }
+
     private fun sendLocationToServer(location: TraccarLocation) {
         val config = currentConfig ?: return
         val traccarConfig = TraccarConfig(
@@ -407,6 +475,20 @@ class LocationTrackingService : Service() {
         notificationManager.notify(NOTIFICATION_ID, notification)
     }
 
+    private fun updateNotificationSpeed(location: Location, speed: Float) {
+        val content = buildString {
+            append("Lat: %.4f  Lon: %.4f".format(location.latitude, location.longitude))
+            append("\nSpeed: %.0f km/h (calc)".format(speed * 3.6))
+            val time = java.text.SimpleDateFormat("HH:mm:ss", java.util.Locale.getDefault())
+                .format(java.util.Date(location.time))
+            append("\nLast: $time")
+        }
+
+        val notification = createNotification(content)
+        val notificationManager = getSystemService(NotificationManager::class.java)
+        notificationManager.notify(NOTIFICATION_ID, notification)
+    }
+
     private fun acquireWakeLock() {
         val powerManager = getSystemService(Context.POWER_SERVICE) as PowerManager
         wakeLock = powerManager.newWakeLock(