/**
 * Represents a node with its geographic location.
 */
data class LocationNode(
    val node: OrgNode,
    val coordinate: GeoCoordinate,
    val tags: List<String> = emptyList()
)

package computer.whatthefuck.arcology.app.viewmodel

import android.content.Context
import android.content.Intent
import android.net.Uri
import androidx.core.content.FileProvider
import androidx.lifecycle.ViewModel
import androidx.lifecycle.viewModelScope
import computer.whatthefuck.arcology.app.data.AppPreferences
import computer.whatthefuck.arcology.database.RoamRepository
import computer.whatthefuck.arcology.domain.GeoCoordinate
import computer.whatthefuck.arcology.domain.OrgNode
import computer.whatthefuck.arcology.gis.GpxExportService
import kotlinx.coroutines.flow.MutableStateFlow
import kotlinx.coroutines.flow.StateFlow
import kotlinx.coroutines.flow.asStateFlow
import kotlinx.coroutines.launch
import java.io.File

/**
 * Represents a node with its geographic location.
 */
data class LocationNode(
    val node: OrgNode,
    val coordinate: GeoCoordinate,
    val tags: List<String> = emptyList()
)

/**
 * ViewModel for the location map screen.
 */
class MapViewModel(
    private val repository: RoamRepository,
    private val gpxExportServiceFactory: (Uri) -> GpxExportService,
    private val appPreferences: AppPreferences
) : ViewModel() {

    private val _locationNodes = MutableStateFlow<List<LocationNode>>(emptyList())
    val locationNodes: StateFlow<List<LocationNode>> = _locationNodes.asStateFlow()

    private val _isLoading = MutableStateFlow(false)
    val isLoading: StateFlow<Boolean> = _isLoading.asStateFlow()

    private val _selectedNode = MutableStateFlow<LocationNode?>(null)
    val selectedNode: StateFlow<LocationNode?> = _selectedNode.asStateFlow()

    private val _filterTags = MutableStateFlow<Set<String>>(emptySet())
    val filterTags: StateFlow<Set<String>> = _filterTags.asStateFlow()

    private val _availableTags = MutableStateFlow<List<String>>(emptyList())
    val availableTags: StateFlow<List<String>> = _availableTags.asStateFlow()

    init {
        loadLocations()
    }

    /**
     * Refresh location data from the database.
     */
    fun refresh() {
        loadLocations()
    }

    /**
     * Get saved map camera state.
     */
    fun getMapCameraState(): Triple<Double, Double, Float>? {
        return appPreferences.getMapCameraState()
    }

    /**
     * Save map camera state for restoration.
     */
    fun saveMapCameraState(latitude: Double, longitude: Double, scale: Float) {
        appPreferences.setMapCameraState(latitude, longitude, scale)
    }

    /**
     * Load all nodes that have location data.
     */
    fun loadLocations() {
        viewModelScope.launch {
            _isLoading.value = true
            try {
                val nodesWithLocation = repository.getNodesWithLocation()

                val locationNodes = nodesWithLocation.map { (node, coord) ->
                    val tags = repository.getTagsByNode(node.id)
                    LocationNode(node, coord, tags)
                }

                _locationNodes.value = locationNodes

                // Extract all unique tags for filtering
                val allTags = locationNodes.flatMap { it.tags }.distinct().sorted()
                _availableTags.value = allTags
            } finally {
                _isLoading.value = false
            }
        }
    }

    /**
     * Filter nodes by tags.
     */
    fun setTagFilter(tags: Set<String>) {
        _filterTags.value = tags
    }

    /**
     * Toggle a tag in the filter.
     */
    fun toggleTagFilter(tag: String) {
        _filterTags.value = if (tag in _filterTags.value) {
            _filterTags.value - tag
        } else {
            _filterTags.value + tag
        }
    }

    /**
     * Clear all tag filters.
     */
    fun clearTagFilter() {
        _filterTags.value = emptySet()
    }

    /**
     * Get the currently filtered nodes.
     */
    fun getFilteredNodes(): List<LocationNode> {
        val tags = _filterTags.value
        return if (tags.isEmpty()) {
            _locationNodes.value
        } else {
            _locationNodes.value.filter { node ->
                node.tags.any { it in tags }
            }
        }
    }

    /**
     * Select a node (for showing details popup).
     */
    fun selectNode(node: LocationNode?) {
        _selectedNode.value = node
    }

    /**
     * Export filtered locations to GPX (OsmAnd favorites format).
     *
     * Builds the service against the currently selected org tree (bodies are
     * read from the files). Suspend: the composable launches it from a
     * rememberCoroutineScope around the share FAB.
     *
     * @param context Android context for file operations
     * @param documentName Name for the GPX metadata
     * @return Intent for sharing the GPX file, or null on failure
     */
    suspend fun exportToGpx(context: Context, documentName: String = "Arcology Locations"): Intent? =
        // bodies read per file + 200 points of node building: off the UI
        // thread, or the share FAB freezes the map screen mid-export
        kotlinx.coroutines.withContext(kotlinx.coroutines.Dispatchers.IO) {
            exportToGpxInternal(context, documentName)
        }

    private suspend fun exportToGpxInternal(
        context: Context,
        documentName: String
    ): Intent? {
        val nodes = getFilteredNodes()
        if (nodes.isEmpty()) return null
        val treeUri = appPreferences.getSelectedDirectoryUri() ?: return null
        val service = gpxExportServiceFactory(treeUri)

        val export = service.exportToGpx(
            nodes = nodes.map { it.node to it.coordinate },
            documentName = documentName,
            documentDescription = "Exported from Arcology"
        )

        return try {
            // Create temp file
            val file = File(context.cacheDir, "export.gpx")
            file.writeText(export.content)

            // Create share intent
            val uri = FileProvider.getUriForFile(
                context,
                "${context.packageName}.fileprovider",
                file
            )

            Intent(Intent.ACTION_SEND).apply {
                type = GpxExportService.GPX_MIME_TYPE
                putExtra(Intent.EXTRA_STREAM, uri)
                addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
            }
        } catch (e: Exception) {
            null
        }
    }
}

package computer.whatthefuck.arcology.app.ui.screens

import android.Manifest
import android.content.Intent
import androidx.activity.compose.rememberLauncherForActivityResult
import androidx.activity.result.contract.ActivityResultContracts
import androidx.compose.foundation.background
import androidx.compose.foundation.border
import androidx.compose.foundation.clickable
import androidx.compose.foundation.horizontalScroll
import androidx.compose.foundation.layout.*
import androidx.compose.foundation.rememberScrollState
import androidx.compose.foundation.shape.CircleShape
import androidx.compose.foundation.shape.RoundedCornerShape
import androidx.compose.material.icons.Icons
import androidx.compose.material.icons.filled.Close
import androidx.compose.material.icons.filled.FilterList
import androidx.compose.material.icons.filled.MyLocation
import androidx.compose.material.icons.filled.Place
import androidx.compose.material.icons.filled.Share
import androidx.compose.material3.*
import androidx.compose.runtime.*
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.draw.clip
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.platform.LocalContext
import androidx.compose.ui.text.style.TextOverflow
import androidx.compose.ui.unit.dp
import computer.whatthefuck.arcology.app.data.LocationService
import computer.whatthefuck.arcology.app.map.MapUtils
import computer.whatthefuck.arcology.app.map.OsmTileProvider
import computer.whatthefuck.arcology.domain.GeoCoordinate
import computer.whatthefuck.arcology.app.viewmodel.LocationNode
import computer.whatthefuck.arcology.app.viewmodel.MapViewModel
import kotlinx.coroutines.launch
import org.koin.androidx.compose.koinViewModel
import org.koin.compose.koinInject
import ovh.plrapps.mapcompose.api.*
import ovh.plrapps.mapcompose.ui.MapUI
import ovh.plrapps.mapcompose.ui.state.MapState
import ovh.plrapps.mapcompose.ui.state.markers.model.RenderingStrategy
import kotlin.math.pow

@OptIn(ExperimentalMaterial3Api::class, ExperimentalLayoutApi::class)
@Composable
fun LocationMapScreen(
    viewModel: MapViewModel = koinViewModel(),
    onNodeSelected: (nodeId: String) -> Unit
) {
    val context = LocalContext.current
    val scope = rememberCoroutineScope()
    val locationService: LocationService = koinInject()

    val locationNodes by viewModel.locationNodes.collectAsState()
    val isLoading by viewModel.isLoading.collectAsState()
    val selectedNode by viewModel.selectedNode.collectAsState()
    val filterTags by viewModel.filterTags.collectAsState()
    val availableTags by viewModel.availableTags.collectAsState()

    var showFilterSheet by remember { mutableStateOf(false) }
    var isLocating by remember { mutableStateOf(false) }
    var hasLocationPermission by remember { mutableStateOf(locationService.hasLocationPermission()) }

    // Track whether we have a saved camera state to skip auto-fit
    val savedCameraState = remember { viewModel.getMapCameraState() }

    // Create tile provider
    val tileProvider = remember { OsmTileProvider(context) }

    // Create map state with clustering
    val mapState = remember {
        MapState(
            levelCount = OsmTileProvider.MAX_ZOOM + 1,
            fullWidth = OsmTileProvider.TILE_SIZE * 2.0.pow(OsmTileProvider.MAX_ZOOM.toDouble()).toInt(),
            fullHeight = OsmTileProvider.TILE_SIZE * 2.0.pow(OsmTileProvider.MAX_ZOOM.toDouble()).toInt(),
            workerCount = 4
        ).apply {
            addLayer(tileProvider)
            // Add clusterer for grouping nearby markers
            addClusterer("locations") { ids ->
                { ClusterMarker(count = ids.count()) }
            }
            // Start with saved scale or default world view
            scale = savedCameraState?.third?.toDouble() ?: 0.0001
        }
    }

    // Permission launcher - must be after mapState definition
    val locationPermissionLauncher = rememberLauncherForActivityResult(
        contract = ActivityResultContracts.RequestMultiplePermissions()
    ) { permissions ->
        hasLocationPermission = permissions[Manifest.permission.ACCESS_FINE_LOCATION] == true ||
                               permissions[Manifest.permission.ACCESS_COARSE_LOCATION] == true
        if (hasLocationPermission) {
            // Fetch location after permission granted
            scope.launch {
                isLocating = true
                val location = locationService.getCurrentLocation()
                if (location != null) {
                    val (x, y) = MapUtils.geoToNormalized(location)
                    // Set scale first, then scroll
                    mapState.scale = 0.01 // City level zoom
                    mapState.scrollTo(x, y)
                }
                isLocating = false
            }
        }
    }

    // Restore camera position on load
    LaunchedEffect(Unit) {
        savedCameraState?.let { (lat, lon, _) ->
            val (x, y) = MapUtils.geoToNormalized(GeoCoordinate(lat, lon))
            mapState.scrollTo(x, y)
        }
    }

    // Save camera position on exit
    DisposableEffect(Unit) {
        onDispose {
            val coord = MapUtils.normalizedToGeo(mapState.centroidX, mapState.centroidY)
            viewModel.saveMapCameraState(coord.latitude, coord.longitude, mapState.scale.toFloat())
        }
    }

    // Get filtered nodes
    val filteredNodes = remember(locationNodes, filterTags) {
        viewModel.getFilteredNodes()
    }

    // Track if this is the first load (for auto-fit logic)
    var isFirstLoad by remember { mutableStateOf(true) }

    // Add markers for nodes
    LaunchedEffect(filteredNodes) {
        // Clear existing markers
        mapState.removeAllMarkers()

        // Add markers for each node with clustering
        filteredNodes.forEach { locationNode ->
            val (x, y) = MapUtils.geoToNormalized(locationNode.coordinate)
            mapState.addMarker(
                id = locationNode.node.id,
                x = x,
                y = y,
                renderingStrategy = RenderingStrategy.Clustering("locations")
            ) {
                MarkerPin(
                    title = locationNode.node.title ?: "Location",
                    isSelected = selectedNode?.node?.id == locationNode.node.id,
                    onClick = { viewModel.selectNode(locationNode) }
                )
            }
        }

        // If we have nodes and no saved camera state, fit the map to show them all
        // Only do this on first load to avoid jumping when filter changes
        if (filteredNodes.isNotEmpty() && isFirstLoad && savedCameraState == null) {
            val coords = filteredNodes.map { it.coordinate }
            MapUtils.boundingBox(coords)?.let { (sw, ne) ->
                val center = MapUtils.center(sw, ne)
                val (cx, cy) = MapUtils.geoToNormalized(center)
                mapState.scrollTo(cx, cy)
            }
        }
        isFirstLoad = false
    }

    Box(modifier = Modifier.fillMaxSize()) {
        // Map
        MapUI(
            modifier = Modifier.fillMaxSize(),
            state = mapState
        )

        // Loading indicator
        if (isLoading) {
            CircularProgressIndicator(
                modifier = Modifier
                    .align(Alignment.Center)
                    .size(48.dp)
            )
        }

        // Top bar with filter and export buttons
        Row(
            modifier = Modifier
                .fillMaxWidth()
                .padding(16.dp)
                .align(Alignment.TopCenter),
            horizontalArrangement = Arrangement.SpaceBetween
        ) {
            // Location count
            Surface(
                shape = RoundedCornerShape(8.dp),
                color = MaterialTheme.colorScheme.surface.copy(alpha = 0.9f)
            ) {
                Text(
                    text = "${filteredNodes.size} locations",
                    modifier = Modifier.padding(horizontal = 12.dp, vertical = 8.dp),
                    style = MaterialTheme.typography.labelLarge
                )
            }

            Row(horizontalArrangement = Arrangement.spacedBy(8.dp)) {
                // Filter button
                if (availableTags.isNotEmpty()) {
                    FloatingActionButton(
                        onClick = { showFilterSheet = true },
                        containerColor = if (filterTags.isNotEmpty())
                            MaterialTheme.colorScheme.primary
                        else
                            MaterialTheme.colorScheme.surface
                    ) {
                        Icon(Icons.Default.FilterList, contentDescription = "Filter")
                    }
                }

                // Export button
                FloatingActionButton(
                    onClick = {
                        scope.launch {
                            val intent = viewModel.exportToGpx(context)
                            if (intent != null) {
                                context.startActivity(Intent.createChooser(intent, "Share GPX"))
                            }
                        }
                    },
                    containerColor = MaterialTheme.colorScheme.surface
                ) {
                    Icon(Icons.Default.Share, contentDescription = "Export GPX")
                }
            }
        }

        // Tag filter chips (if any tags are selected)
        if (filterTags.isNotEmpty()) {
            Row(
                modifier = Modifier
                    .fillMaxWidth()
                    .padding(horizontal = 16.dp)
                    .padding(top = 80.dp)
                    .align(Alignment.TopStart)
                    .horizontalScroll(rememberScrollState()),
                horizontalArrangement = Arrangement.spacedBy(8.dp)
            ) {
                filterTags.forEach { tag ->
                    FilterChip(
                        selected = true,
                        onClick = { viewModel.toggleTagFilter(tag) },
                        label = { Text(tag) },
                        trailingIcon = {
                            Icon(
                                Icons.Default.Close,
                                contentDescription = "Remove filter",
                                modifier = Modifier.size(16.dp)
                            )
                        }
                    )
                }
                TextButton(onClick = { viewModel.clearTagFilter() }) {
                    Text("Clear all")
                }
            }
        }

        // Locate me FAB
        FloatingActionButton(
            onClick = {
                if (!hasLocationPermission) {
                    locationPermissionLauncher.launch(
                        arrayOf(
                            Manifest.permission.ACCESS_FINE_LOCATION,
                            Manifest.permission.ACCESS_COARSE_LOCATION
                        )
                    )
                } else {
                    scope.launch {
                        isLocating = true
                        val location = locationService.getCurrentLocation()
                        if (location != null) {
                            // Center map on current location with city-level zoom
                            val (x, y) = MapUtils.geoToNormalized(location)
                            // Set scale first, then scroll
                            mapState.scale = 0.01 // City level zoom
                            mapState.scrollTo(x, y)
                        }
                        isLocating = false
                    }
                }
            },
            modifier = Modifier
                .align(Alignment.BottomEnd)
                .padding(16.dp)
                .padding(bottom = if (selectedNode != null) 200.dp else 0.dp),
            containerColor = MaterialTheme.colorScheme.primaryContainer
        ) {
            if (isLocating) {
                CircularProgressIndicator(
                    modifier = Modifier.size(24.dp),
                    strokeWidth = 2.dp
                )
            } else {
                Icon(
                    Icons.Default.MyLocation,
                    contentDescription = "Locate me"
                )
            }
        }

        // Selected node details
        selectedNode?.let { node ->
            NodeDetailsCard(
                locationNode = node,
                onClose = { viewModel.selectNode(null) },
                onOpen = { onNodeSelected(node.node.id) },
                modifier = Modifier
                    .align(Alignment.BottomCenter)
                    .padding(16.dp)
            )
        }
    }

    // Filter bottom sheet
    if (showFilterSheet) {
        ModalBottomSheet(
            onDismissRequest = { showFilterSheet = false }
        ) {
            Column(
                modifier = Modifier
                    .fillMaxWidth()
                    .padding(16.dp)
            ) {
                Text(
                    "Filter by tags",
                    style = MaterialTheme.typography.titleMedium,
                    modifier = Modifier.padding(bottom = 16.dp)
                )

                FlowRow(
                    modifier = Modifier.fillMaxWidth(),
                    horizontalArrangement = Arrangement.spacedBy(8.dp),
                    verticalArrangement = Arrangement.spacedBy(8.dp)
                ) {
                    availableTags.forEach { tag ->
                        FilterChip(
                            selected = tag in filterTags,
                            onClick = { viewModel.toggleTagFilter(tag) },
                            label = { Text(tag) }
                        )
                    }
                }

                Spacer(modifier = Modifier.height(32.dp))
            }
        }
    }
}

@Composable
private fun MarkerPin(
    title: String,
    isSelected: Boolean,
    onClick: () -> Unit
) {
    Column(
        horizontalAlignment = Alignment.CenterHorizontally,
        modifier = Modifier.clickable(onClick = onClick)
    ) {
        Icon(
            Icons.Default.Place,
            contentDescription = title,
            tint = if (isSelected) MaterialTheme.colorScheme.primary else Color.Red,
            modifier = Modifier.size(if (isSelected) 40.dp else 32.dp)
        )
        if (isSelected) {
            Surface(
                shape = RoundedCornerShape(4.dp),
                color = MaterialTheme.colorScheme.surface.copy(alpha = 0.9f)
            ) {
                Text(
                    text = title,
                    style = MaterialTheme.typography.labelSmall,
                    modifier = Modifier.padding(4.dp),
                    maxLines = 1,
                    overflow = TextOverflow.Ellipsis
                )
            }
        }
    }
}

@Composable
private fun NodeDetailsCard(
    locationNode: LocationNode,
    onClose: () -> Unit,
    onOpen: () -> Unit,
    modifier: Modifier = Modifier
) {
    Card(
        modifier = modifier.fillMaxWidth(),
        elevation = CardDefaults.cardElevation(defaultElevation = 8.dp)
    ) {
        Column(
            modifier = Modifier.padding(16.dp)
        ) {
            Row(
                modifier = Modifier.fillMaxWidth(),
                horizontalArrangement = Arrangement.SpaceBetween,
                verticalAlignment = Alignment.CenterVertically
            ) {
                Text(
                    text = locationNode.node.title ?: "Untitled",
                    style = MaterialTheme.typography.titleMedium,
                    modifier = Modifier.weight(1f),
                    maxLines = 2,
                    overflow = TextOverflow.Ellipsis
                )
                IconButton(onClick = onClose) {
                    Icon(Icons.Default.Close, contentDescription = "Close")
                }
            }

            if (locationNode.node.outlinePath.isNotEmpty()) {
                Text(
                    text = locationNode.node.outlinePath.joinToString(" > "),
                    style = MaterialTheme.typography.bodySmall,
                    color = MaterialTheme.colorScheme.onSurfaceVariant,
                    maxLines = 1,
                    overflow = TextOverflow.Ellipsis
                )
            }

            Text(
                text = "%.4f, %.4f".format(
                    locationNode.coordinate.latitude,
                    locationNode.coordinate.longitude
                ),
                style = MaterialTheme.typography.bodySmall,
                color = MaterialTheme.colorScheme.onSurfaceVariant
            )

            if (locationNode.tags.isNotEmpty()) {
                Row(
                    modifier = Modifier
                        .fillMaxWidth()
                        .padding(top = 8.dp)
                        .horizontalScroll(rememberScrollState()),
                    horizontalArrangement = Arrangement.spacedBy(4.dp)
                ) {
                    locationNode.tags.forEach { tag ->
                        SuggestionChip(
                            onClick = { },
                            label = { Text(tag, style = MaterialTheme.typography.labelSmall) }
                        )
                    }
                }
            }

            Spacer(modifier = Modifier.height(8.dp))

            Button(
                onClick = onOpen,
                modifier = Modifier.fillMaxWidth()
            ) {
                Text("Open")
            }
        }
    }
}

@Composable
private fun ClusterMarker(count: Int) {
    Box(
        modifier = Modifier
            .size(40.dp)
            .clip(CircleShape)
            .background(MaterialTheme.colorScheme.primary)
            .border(2.dp, MaterialTheme.colorScheme.onPrimary, CircleShape),
        contentAlignment = Alignment.Center
    ) {
        Text(
            text = if (count > 99) "99+" else count.toString(),
            color = MaterialTheme.colorScheme.onPrimary,
            style = MaterialTheme.typography.labelMedium
        )
    }
}

<<map-viewmodel>>

<<mapscreen-preamble>>

<<mapscreen-composable>>

<<mapscreen-markerpin>>

<<mapscreen-nodedetails>>

<<mapscreen-clustermarker>>

import computer.whatthefuck.arcology.domain.GeoCoordinate
import kotlin.math.*

object MapUtils {

    const val MAX_LATITUDE = 85.0511287798

    fun geoToNormalized(coord: GeoCoordinate): Pair<Double, Double> {
        return geoToNormalized(coord.latitude, coord.longitude)
    }

    fun geoToNormalized(latitude: Double, longitude: Double): Pair<Double, Double> {
        val lat = latitude.coerceIn(-MAX_LATITUDE, MAX_LATITUDE)
        val x = (longitude + 180.0) / 360.0
        val latRad = Math.toRadians(lat)
        val mercatorY = ln(tan(PI / 4 + latRad / 2))
        val y = (1.0 - mercatorY / PI) / 2.0
        return x to y
    }

    fun normalizedToGeo(x: Double, y: Double): GeoCoordinate {
        val longitude = x * 360.0 - 180.0
        val mercatorY = (1.0 - 2.0 * y) * PI
        val latitude = Math.toDegrees(2 * atan(exp(mercatorY)) - PI / 2)
        return GeoCoordinate(latitude, longitude)
    }

    fun boundingBox(coords: List<GeoCoordinate>): Pair<GeoCoordinate, GeoCoordinate>? {
        if (coords.isEmpty()) return null
        var minLat = Double.MAX_VALUE
        var maxLat = Double.MIN_VALUE
        var minLon = Double.MAX_VALUE
        var maxLon = Double.MIN_VALUE
        for (coord in coords) {
            minLat = minOf(minLat, coord.latitude)
            maxLat = maxOf(maxLat, coord.latitude)
            minLon = minOf(minLon, coord.longitude)
            maxLon = maxOf(maxLon, coord.longitude)
        }
        return GeoCoordinate(minLat, minLon) to GeoCoordinate(maxLat, maxLon)
    }

    fun center(sw: GeoCoordinate, ne: GeoCoordinate): GeoCoordinate {
        return GeoCoordinate(
            latitude = (sw.latitude + ne.latitude) / 2,
            longitude = (sw.longitude + ne.longitude) / 2
        )
    }
}

package computer.whatthefuck.arcology.app.map

<<map-utils>>

import android.content.Context
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.withContext
import ovh.plrapps.mapcompose.core.TileStreamProvider
import java.io.File
import java.io.InputStream
import java.net.HttpURLConnection
import java.net.URL

class OsmTileProvider(
    private val context: Context,
    private val userAgent: String = "Arcology/1.0 (Android)",
    private val tileServerUrl: String = "https://tile.openstreetmap.org"
) : TileStreamProvider {

    private val cacheDir: File by lazy {
        File(context.cacheDir, "osm_tiles").also { it.mkdirs() }
    }

    override suspend fun getTileStream(row: Int, col: Int, zoomLvl: Int): InputStream? = withContext(Dispatchers.IO) {
        val x = col
        val y = row
        val z = zoomLvl

        val cacheFile = getCacheFile(z, x, y)
        if (cacheFile.exists() && cacheFile.length() > 0) {
            return@withContext try {
                cacheFile.inputStream()
            } catch (e: Exception) {
                null
            }
        }

        return@withContext try {
            fetchAndCacheTile(z, x, y, cacheFile)
        } catch (e: Exception) {
            null
        }
    }

    private fun getCacheFile(z: Int, x: Int, y: Int): File {
        val dir = File(cacheDir, "$z/$x")
        dir.mkdirs()
        return File(dir, "$y.png")
    }

    private fun fetchAndCacheTile(z: Int, x: Int, y: Int, cacheFile: File): InputStream? {
        val url = URL("$tileServerUrl/$z/$x/$y.png")
        val connection = url.openConnection() as HttpURLConnection

        return try {
            connection.apply {
                requestMethod = "GET"
                setRequestProperty("User-Agent", userAgent)
                connectTimeout = 10000
                readTimeout = 10000
            }

            if (connection.responseCode == HttpURLConnection.HTTP_OK) {
                val bytes = connection.inputStream.readBytes()

                try {
                    cacheFile.parentFile?.mkdirs()
                    cacheFile.writeBytes(bytes)
                } catch (e: Exception) {
                }

                bytes.inputStream()
            } else {
                null
            }
        } finally {
            connection.disconnect()
        }
    }

    suspend fun clearCache() = withContext(Dispatchers.IO) {
        cacheDir.deleteRecursively()
        cacheDir.mkdirs()
    }

    suspend fun getCacheSize(): Long = withContext(Dispatchers.IO) {
        cacheDir.walkTopDown()
            .filter { it.isFile }
            .sumOf { it.length() }
    }

    companion object {
        const val MIN_ZOOM = 0
        const val MAX_ZOOM = 19
        const val TILE_SIZE = 256
    }
}

package computer.whatthefuck.arcology.app.map

<<map-osmtileprovider>>