init

app/src/main/java/org/pupes/mhdrunpathfinder/HaukUtils.kt

@@ -0,0 +1,74 @@
+package org.pupes.mhdrunpathfinder
+
+import android.app.Activity
+import android.os.Handler
+import android.os.Looper
+import android.widget.Toast
+import kotlinx.serialization.json.Json
+import okhttp3.OkHttpClient
+import ovh.plrapps.mapcompose.api.moveMarker
+import java.net.URL
+
+// OkHttpClient for making HTTP requests
+val httpClient = OkHttpClient.Builder()
+    .build()
+
+private val HaukMainHandler = Handler(Looper.getMainLooper())
+private var HaukTrackingThread: Thread? = null
+private var HaukIsTracking = false
+
+private fun fetchHaukPosition(haukUrl: String, callee: Activity) {
+    try {
+        val url = URL(haukUrl)
+        val targetId = url.toString().substringAfter("?")
+
+        val request = okhttp3.Request.Builder()
+            .url("${url.protocol}://${url.host}/api/fetch.php?id=$targetId")
+            .header("User-Agent", "${BuildConfig.APPLICATION_ID}/${BuildConfig.VERSION_NAME} (Android)")
+            .build()
+
+        httpClient.newCall(request).execute().use { response ->
+            var message = if (response.isSuccessful) {
+                response.body?.string() ?: "Empty response"
+            } else {
+                "Error: ${response.code} ${response.message}"
+            }
+
+            message = "{" + message.substringAfter("{");
+            val hauk_response = Json.decodeFromString<HaukResponse>(message)
+
+            HaukMainHandler.post {
+                mapState.moveMarker("target_position", x = longitudeToXNormalized(hauk_response.points.last()[1]), y = latitudeToYNormalized(hauk_response.points.last()[0]))
+            }
+
+        }
+    } catch (e: Exception) {
+        // Post UI update to main thread
+        HaukMainHandler.post {
+            Toast.makeText(callee, e.message ?: "Unknown error", Toast.LENGTH_LONG).show()
+        }
+    }
+}
+
+// Start the timer with a URL:
+fun startHaukTracking(url: String, callee: Activity) {
+    if (HaukIsTracking) return
+
+    HaukIsTracking = true
+    HaukTrackingThread = Thread {
+        while (HaukIsTracking) {
+            fetchHaukPosition(url, callee)
+            try {
+                Thread.sleep(1000) // Wait 1 second between requests
+            } catch (e: InterruptedException) {
+                break
+            }
+        }
+    }.apply { start() }
+}
+
+fun stopHaukTracking() {
+    HaukIsTracking = false
+    HaukTrackingThread?.interrupt()
+    HaukTrackingThread = null
+}

app/src/main/java/org/pupes/mhdrunpathfinder/Helpers.kt

@@ -0,0 +1,25 @@
+package org.pupes.mhdrunpathfinder
+
+import kotlin.math.PI
+import kotlin.math.ln
+import kotlin.math.tan
+
+fun longitudeToXNormalized(longitude: Double): Double {
+    return (longitude + 180.0) / 360.0
+}
+
+
+fun latitudeToYNormalized(latitude: Double): Double {
+    // Clamp latitude to Web Mercator bounds
+    val lat = latitude.coerceIn(-85.05112878, 85.05112878)
+
+    // Convert to radians
+    val latRad = lat * PI / 180.0
+
+    // Web Mercator projection formula
+    val mercatorY = ln(tan(PI / 4.0 + latRad / 2.0))
+
+    // Normalize to 0.0 - 1.0 range
+    // The mercator Y range is approximately -PI to PI
+    return 0.5 - (mercatorY / (2.0 * PI))
+}

app/src/main/java/org/pupes/mhdrunpathfinder/LocationUtils.kt

@@ -0,0 +1,162 @@
+package org.pupes.mhdrunpathfinder
+
+import android.Manifest
+import android.app.Activity
+import android.content.Context
+import android.content.pm.PackageManager
+import android.location.Location
+import android.location.LocationListener
+import android.location.LocationManager
+import android.os.Handler
+import android.os.Looper
+import android.widget.Toast
+import androidx.core.app.ActivityCompat
+import ovh.plrapps.mapcompose.api.moveMarker
+
+// Handler for main thread operations
+private val LocationMainHandler = Handler(Looper.getMainLooper())
+private var locationManager: LocationManager? = null
+private var locationListener: LocationListener? = null
+private var isLocationTracking = false
+
+// Location update configuration
+private const val MIN_TIME_BETWEEN_UPDATES = 1000L // 1 second in milliseconds
+private const val MIN_DISTANCE_CHANGE = 0f // 0 meters - update on any movement
+
+// LocationListener callback
+private val createLocationListener: (Activity) -> LocationListener = { callee ->
+    LocationListener { location ->
+        handleLocationUpdate(location, callee)
+    }
+}
+
+private fun handleLocationUpdate(location: Location, callee: Activity) {
+    try {
+        val normalizedX = longitudeToXNormalized(location.longitude)
+        val normalizedY = latitudeToYNormalized(location.latitude)
+
+        // Update marker on main thread
+        LocationMainHandler.post {
+            try {
+                mapState.moveMarker(
+                    "current_position",
+                    x = normalizedX,
+                    y = normalizedY
+                )
+            } catch (e: Exception) {
+                // Marker might not exist yet, silently ignore
+            }
+        }
+    } catch (e: Exception) {
+        LocationMainHandler.post {
+            Toast.makeText(callee, "Location error: ${e.message}", Toast.LENGTH_SHORT).show()
+        }
+    }
+}
+
+// Check if location permissions are granted
+private fun hasLocationPermissions(context: Context): Boolean {
+    return ActivityCompat.checkSelfPermission(
+        context,
+        Manifest.permission.ACCESS_FINE_LOCATION
+    ) == PackageManager.PERMISSION_GRANTED ||
+    ActivityCompat.checkSelfPermission(
+        context,
+        Manifest.permission.ACCESS_COARSE_LOCATION
+    ) == PackageManager.PERMISSION_GRANTED
+}
+
+// Start continuous location tracking
+fun startLocationTracking(callee: Activity) {
+    if (isLocationTracking) {
+        Toast.makeText(callee, "Location tracking already active", Toast.LENGTH_SHORT).show()
+        return
+    }
+
+    if (!hasLocationPermissions(callee)) {
+        Toast.makeText(callee, "Location permissions not granted", Toast.LENGTH_LONG).show()
+        // Request permissions
+        ActivityCompat.requestPermissions(
+            callee,
+            arrayOf(
+                Manifest.permission.ACCESS_FINE_LOCATION,
+                Manifest.permission.ACCESS_COARSE_LOCATION
+            ),
+            LOCATION_PERMISSION_REQUEST_CODE
+        )
+        return
+    }
+
+    try {
+        locationManager = callee.getSystemService(Context.LOCATION_SERVICE) as LocationManager
+        locationListener = createLocationListener(callee)
+
+        // Try GPS first, then network provider
+        val providers = listOf(
+            LocationManager.GPS_PROVIDER,
+            LocationManager.NETWORK_PROVIDER
+        )
+
+        var providerFound = false
+        for (provider in providers) {
+            if (locationManager?.isProviderEnabled(provider) == true) {
+                try {
+                    locationManager?.requestLocationUpdates(
+                        provider,
+                        MIN_TIME_BETWEEN_UPDATES,
+                        MIN_DISTANCE_CHANGE,
+                        locationListener!!,
+                        Looper.getMainLooper()
+                    )
+                    providerFound = true
+
+                    // Get last known location and update immediately
+                    locationManager?.getLastKnownLocation(provider)?.let { location ->
+                        handleLocationUpdate(location, callee)
+                    }
+
+                    break
+                } catch (e: SecurityException) {
+                    // Permission denied
+                    Toast.makeText(callee, "Location permission denied", Toast.LENGTH_LONG).show()
+                    return
+                }
+            }
+        }
+
+        if (!providerFound) {
+            Toast.makeText(callee, "No location provider available. Please enable GPS or network location", Toast.LENGTH_LONG).show()
+            return
+        }
+
+        isLocationTracking = true
+        Toast.makeText(callee, "Location tracking started", Toast.LENGTH_SHORT).show()
+
+    } catch (e: Exception) {
+        Toast.makeText(callee, "Failed to start location tracking: ${e.message}", Toast.LENGTH_LONG).show()
+    }
+}
+
+// Stop location tracking
+fun stopLocationTracking() {
+    if (!isLocationTracking) return
+
+    try {
+        locationListener?.let { listener ->
+            locationManager?.removeUpdates(listener)
+        }
+        locationListener = null
+        locationManager = null
+        isLocationTracking = false
+    } catch (e: Exception) {
+        // Silently handle cleanup errors
+    }
+}
+
+// Get current tracking status
+fun isLocationTrackingActive(): Boolean {
+    return isLocationTracking
+}
+
+// Permission request code
+const val LOCATION_PERMISSION_REQUEST_CODE = 1001

app/src/main/java/org/pupes/mhdrunpathfinder/MainActivity.kt

@@ -0,0 +1,153 @@
+package org.pupes.mhdrunpathfinder
+
+import android.R.attr.onClick
+import android.os.Bundle
+import androidx.activity.ComponentActivity
+import androidx.activity.compose.setContent
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.size
+import androidx.compose.material3.Icon
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.OutlinedButton
+import androidx.compose.material3.Surface
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.res.painterResource
+import androidx.compose.ui.tooling.preview.Preview
+import androidx.compose.ui.unit.dp
+import kotlinx.serialization.Serializable
+import ovh.plrapps.mapcompose.api.addLayer
+import ovh.plrapps.mapcompose.api.addMarker
+import ovh.plrapps.mapcompose.api.scrollTo
+import ovh.plrapps.mapcompose.core.TileStreamProvider
+import ovh.plrapps.mapcompose.ui.MapUI
+import ovh.plrapps.mapcompose.ui.state.MapState
+import java.net.URL
+
+@Serializable
+data class HaukResponse(
+    val type: Int,
+    val expire: Long,
+    val serverTime: Double,
+    val interval: Int,
+    val points: List<List<Double>>,
+    val encrypted: Boolean,
+    val salt: String? = null
+)
+
+// MapState configuration for OpenStreetMap
+// Max zoom level is 18, tile size is 256x256
+// At zoom level 18, there are 2^18 = 262144 tiles in each dimension
+// So fullWidth/Height = 256 * 262144
+val mapState = MapState(
+    levelCount = 19, // zoom levels 0-18
+    fullWidth = 67108864, // 256 * 2^18
+    fullHeight = 67108864,
+    tileSize = 256
+)
+
+
+
+
+class MainActivity : ComponentActivity() {
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+
+
+        setContent {
+            MaterialTheme {
+                Surface(
+                    modifier = Modifier.fillMaxSize(),
+                    color = MaterialTheme.colorScheme.background
+                ) {
+                    OpenStreetMapScreen()
+                    AddButton()
+                }
+            }
+        }
+        startHaukTracking("https://hauk.limit6.eu/?M4SJ-SH7I",this)
+        startLocationTracking(this)
+
+    }
+
+    override fun onDestroy() {
+        super.onDestroy()
+        stopHaukTracking()
+        stopLocationTracking()
+    }
+}
+
+@Preview
+@Composable
+// When a composable with parameters is used with @Preview,
+// a default value must be provided for the preview to render.
+fun AddButton(onClick: () -> Unit = {}) {
+    OutlinedButton(onClick = { onClick() }) {
+        Text("Outlined")
+    }
+}
+
+@Preview
+@Composable
+fun OpenStreetMapScreen() {
+    // Create tile stream provider for OpenStreetMap with User-Agent
+    val tileStreamProvider = TileStreamProvider { row, col, zoomLvl ->
+        try {
+            val url = URL("https://tile.openstreetmap.org/$zoomLvl/$col/$row.png")
+            val connection = url.openConnection()
+            // Set User-Agent header as required by OSM tile usage policy
+            // Format: AppId/Version (Platform) (Contact: email)
+            val userAgent = "${BuildConfig.APPLICATION_ID}/${BuildConfig.VERSION_NAME} (Android) (Contact: poliecho@pupes.org)"
+            connection.setRequestProperty("User-Agent", userAgent)
+            connection.getInputStream()
+        } catch (e: Exception) {
+            e.printStackTrace()
+            null
+        }
+    }
+
+
+
+    /* Add a marker at the center of the map */
+    mapState.addMarker("target_position", x = longitudeToXNormalized(14.4058031), y = latitudeToYNormalized(50.0756083)) {
+        Icon(
+            painter = painterResource(id = R.drawable.target),
+            contentDescription = null,
+            modifier = Modifier.size(20.dp),
+            tint = Color(0xFFFF0000)
+        )
+    }
+
+    /* Add a marker for current position */
+    mapState.addMarker("current_position", x = longitudeToXNormalized(14.4378), y = latitudeToYNormalized(50.0755)) {
+        Icon(
+            painter = painterResource(id = R.drawable.user_location),
+            contentDescription = null,
+            modifier = Modifier.size(20.dp),
+            tint = Color(0xFF0000FF) // Blue color for current position
+        )
+    }
+
+    // Add the tile layer and set initial position
+    LaunchedEffect(Unit) {
+        mapState.addLayer(tileStreamProvider)
+
+        // Scroll to Prague, Czech Republic
+        // Prague coordinates: latitude 50.0755, longitude 14.4378
+        val normalizedX = longitudeToXNormalized(14.4378)
+        val normalizedY = latitudeToYNormalized(50.0755)
+
+        // Use a higher scale to zoom in more (closer to 1.0 = more zoomed in)
+        mapState.scrollTo(normalizedX, normalizedY, destScale = 0.8)
+    }
+
+    // Display the map
+    MapUI(
+        modifier = Modifier.fillMaxSize(),
+        state = mapState
+    )
+}
+

app/src/main/java/org/pupes/mhdrunpathfinder/ui/theme/Color.kt

@@ -0,0 +1,11 @@
+package org.pupes.mhdrunpathfinder.ui.theme
+
+import androidx.compose.ui.graphics.Color
+
+val Purple80 = Color(0xFFD0BCFF)
+val PurpleGrey80 = Color(0xFFCCC2DC)
+val Pink80 = Color(0xFFEFB8C8)
+
+val Purple40 = Color(0xFF6650a4)
+val PurpleGrey40 = Color(0xFF625b71)
+val Pink40 = Color(0xFF7D5260)

app/src/main/java/org/pupes/mhdrunpathfinder/ui/theme/Theme.kt

@@ -0,0 +1,58 @@
+package org.pupes.mhdrunpathfinder.ui.theme
+
+import android.app.Activity
+import android.os.Build
+import androidx.compose.foundation.isSystemInDarkTheme
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.darkColorScheme
+import androidx.compose.material3.dynamicDarkColorScheme
+import androidx.compose.material3.dynamicLightColorScheme
+import androidx.compose.material3.lightColorScheme
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.platform.LocalContext
+
+private val DarkColorScheme = darkColorScheme(
+    primary = Purple80,
+    secondary = PurpleGrey80,
+    tertiary = Pink80
+)
+
+private val LightColorScheme = lightColorScheme(
+    primary = Purple40,
+    secondary = PurpleGrey40,
+    tertiary = Pink40
+
+    /* Other default colors to override
+    background = Color(0xFFFFFBFE),
+    surface = Color(0xFFFFFBFE),
+    onPrimary = Color.White,
+    onSecondary = Color.White,
+    onTertiary = Color.White,
+    onBackground = Color(0xFF1C1B1F),
+    onSurface = Color(0xFF1C1B1F),
+    */
+)
+
+@Composable
+fun MHDRunPathfinderTheme(
+    darkTheme: Boolean = isSystemInDarkTheme(),
+    // Dynamic color is available on Android 12+
+    dynamicColor: Boolean = true,
+    content: @Composable () -> Unit
+) {
+    val colorScheme = when {
+        dynamicColor && Build.VERSION.SDK_INT >= Build.VERSION_CODES.S -> {
+            val context = LocalContext.current
+            if (darkTheme) dynamicDarkColorScheme(context) else dynamicLightColorScheme(context)
+        }
+
+        darkTheme -> DarkColorScheme
+        else -> LightColorScheme
+    }
+
+    MaterialTheme(
+        colorScheme = colorScheme,
+        typography = Typography,
+        content = content
+    )
+}

app/src/main/java/org/pupes/mhdrunpathfinder/ui/theme/Type.kt

@@ -0,0 +1,34 @@
+package org.pupes.mhdrunpathfinder.ui.theme
+
+import androidx.compose.material3.Typography
+import androidx.compose.ui.text.TextStyle
+import androidx.compose.ui.text.font.FontFamily
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.unit.sp
+
+// Set of Material typography styles to start with
+val Typography = Typography(
+    bodyLarge = TextStyle(
+        fontFamily = FontFamily.Default,
+        fontWeight = FontWeight.Normal,
+        fontSize = 16.sp,
+        lineHeight = 24.sp,
+        letterSpacing = 0.5.sp
+    )
+    /* Other default text styles to override
+    titleLarge = TextStyle(
+        fontFamily = FontFamily.Default,
+        fontWeight = FontWeight.Normal,
+        fontSize = 22.sp,
+        lineHeight = 28.sp,
+        letterSpacing = 0.sp
+    ),
+    labelSmall = TextStyle(
+        fontFamily = FontFamily.Default,
+        fontWeight = FontWeight.Medium,
+        fontSize = 11.sp,
+        lineHeight = 16.sp,
+        letterSpacing = 0.5.sp
+    )
+    */
+)