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bitchat-android/app/src/main/java/com/bitchat/android/ui/LocationChannelsSheet.kt
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2025-10-17 00:55:50 +02:00

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package com.bitchat.android.ui
import android.content.Intent
import android.net.Uri
import android.provider.Settings
import androidx.compose.animation.core.animateFloatAsState
import androidx.compose.foundation.background
import androidx.compose.foundation.layout.*
import androidx.compose.foundation.lazy.LazyColumn
import androidx.compose.foundation.lazy.items
import androidx.compose.foundation.lazy.rememberLazyListState
import androidx.compose.foundation.text.BasicTextField
import androidx.compose.material.icons.Icons
import androidx.compose.material.icons.filled.Bookmark
import androidx.compose.material.icons.filled.Check
import androidx.compose.material.icons.filled.Map
import androidx.compose.material.icons.filled.PinDrop
import androidx.compose.material.icons.outlined.BookmarkBorder
import androidx.compose.material3.*
import androidx.compose.runtime.*
import androidx.compose.runtime.livedata.observeAsState
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.focus.onFocusChanged
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.platform.LocalContext
import androidx.compose.ui.text.font.FontFamily
import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.unit.dp
import androidx.compose.ui.unit.sp
import androidx.activity.compose.rememberLauncherForActivityResult
import androidx.activity.result.contract.ActivityResultContracts
import com.bitchat.android.geohash.ChannelID
import kotlinx.coroutines.launch
import com.bitchat.android.geohash.GeohashChannel
import com.bitchat.android.geohash.GeohashChannelLevel
import com.bitchat.android.geohash.LocationChannelManager
import com.bitchat.android.geohash.GeohashBookmarksStore
import com.bitchat.android.ui.theme.BASE_FONT_SIZE
import androidx.compose.ui.res.stringResource
import com.bitchat.android.R
/**
* Location Channels Sheet for selecting geohash-based location channels
* Direct port from iOS LocationChannelsSheet for 100% compatibility
*/
@OptIn(ExperimentalMaterial3Api::class)
@Composable
fun LocationChannelsSheet(
isPresented: Boolean,
onDismiss: () -> Unit,
viewModel: ChatViewModel,
modifier: Modifier = Modifier
) {
val context = LocalContext.current
val locationManager = LocationChannelManager.getInstance(context)
val bookmarksStore = remember { GeohashBookmarksStore.getInstance(context) }
// Observe location manager state
val permissionState by locationManager.permissionState.observeAsState()
val availableChannels by locationManager.availableChannels.observeAsState(emptyList())
val selectedChannel by locationManager.selectedChannel.observeAsState()
val locationNames by locationManager.locationNames.observeAsState(emptyMap())
val locationServicesEnabled by locationManager.locationServicesEnabled.observeAsState(false)
// Observe bookmarks state
val bookmarks by bookmarksStore.bookmarks.observeAsState(emptyList())
val bookmarkNames by bookmarksStore.bookmarkNames.observeAsState(emptyMap())
// Observe reactive participant counts
val geohashParticipantCounts by viewModel.geohashParticipantCounts.observeAsState(emptyMap())
// UI state
var customGeohash by remember { mutableStateOf("") }
var customError by remember { mutableStateOf<String?>(null) }
var isInputFocused by remember { mutableStateOf(false) }
// Bottom sheet state
val sheetState = rememberModalBottomSheetState(
skipPartiallyExpanded = true
)
val coroutineScope = rememberCoroutineScope()
// Scroll state for LazyColumn with animated top bar
val listState = rememberLazyListState()
val isScrolled by remember {
derivedStateOf {
listState.firstVisibleItemIndex > 0 || listState.firstVisibleItemScrollOffset > 0
}
}
val topBarAlpha by animateFloatAsState(
targetValue = if (isScrolled) 0.95f else 0f,
label = "topBarAlpha"
)
val mapPickerLauncher = rememberLauncherForActivityResult(
contract = ActivityResultContracts.StartActivityForResult()
) { result ->
if (result.resultCode == android.app.Activity.RESULT_OK) {
val gh = result.data?.getStringExtra(GeohashPickerActivity.EXTRA_RESULT_GEOHASH)
if (!gh.isNullOrBlank()) {
customGeohash = gh
customError = null
}
}
}
// iOS system colors (matches iOS exactly)
val colorScheme = MaterialTheme.colorScheme
val isDark = colorScheme.background.red + colorScheme.background.green + colorScheme.background.blue < 1.5f
val standardGreen = if (isDark) Color(0xFF32D74B) else Color(0xFF248A3D) // iOS green
val standardBlue = Color(0xFF007AFF) // iOS blue
if (isPresented) {
ModalBottomSheet(
modifier = modifier.statusBarsPadding(),
onDismissRequest = onDismiss,
sheetState = sheetState,
containerColor = MaterialTheme.colorScheme.background,
dragHandle = null
) {
Box(modifier = Modifier.fillMaxWidth()) {
LazyColumn(
state = listState,
modifier = Modifier.fillMaxSize(),
contentPadding = PaddingValues(top = 48.dp, bottom = 16.dp)
) {
// Header Section
item(key = "header") {
Column(
modifier = Modifier
.fillMaxWidth()
.padding(horizontal = 24.dp)
.padding(bottom = 8.dp),
verticalArrangement = Arrangement.spacedBy(4.dp)
) {
Text(
text = stringResource(R.string.location_channels_title),
style = MaterialTheme.typography.headlineSmall,
fontFamily = FontFamily.Monospace,
fontWeight = FontWeight.Bold,
color = MaterialTheme.colorScheme.onBackground
)
Text(
text = stringResource(R.string.location_channels_desc),
fontSize = 12.sp,
fontFamily = FontFamily.Monospace,
color = MaterialTheme.colorScheme.onBackground.copy(alpha = 0.7f)
)
}
}
// Permission controls if services enabled
if (locationServicesEnabled) {
item(key = "permissions") {
Column(
modifier = Modifier
.fillMaxWidth()
.padding(horizontal = 24.dp)
.padding(bottom = 8.dp),
verticalArrangement = Arrangement.spacedBy(4.dp)
) {
when (permissionState) {
LocationChannelManager.PermissionState.NOT_DETERMINED -> {
Button(
onClick = { locationManager.enableLocationChannels() },
colors = ButtonDefaults.buttonColors(
containerColor = standardGreen.copy(alpha = 0.12f),
contentColor = standardGreen
),
modifier = Modifier.fillMaxWidth()
) {
Text(
text = stringResource(R.string.grant_location_permission),
fontSize = 12.sp,
fontFamily = FontFamily.Monospace
)
}
}
LocationChannelManager.PermissionState.DENIED,
LocationChannelManager.PermissionState.RESTRICTED -> {
Column(verticalArrangement = Arrangement.spacedBy(4.dp)) {
Text(
text = stringResource(R.string.location_permission_denied),
fontSize = 11.sp,
fontFamily = FontFamily.Monospace,
color = Color.Red.copy(alpha = 0.8f)
)
TextButton(
onClick = {
val intent = Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS).apply {
data = Uri.fromParts("package", context.packageName, null)
}
context.startActivity(intent)
}
) {
Text(
text = stringResource(R.string.open_settings),
fontSize = 11.sp,
fontFamily = FontFamily.Monospace
)
}
}
}
LocationChannelManager.PermissionState.AUTHORIZED -> {
Text(
text = stringResource(R.string.location_permission_granted),
fontSize = 11.sp,
fontFamily = FontFamily.Monospace,
color = standardGreen
)
}
null -> {
Row(
horizontalArrangement = Arrangement.spacedBy(4.dp),
verticalAlignment = Alignment.CenterVertically
) {
CircularProgressIndicator(modifier = Modifier.size(12.dp))
Text(
text = stringResource(R.string.checking_permissions),
fontSize = 11.sp,
fontFamily = FontFamily.Monospace,
color = MaterialTheme.colorScheme.onSurface.copy(alpha = 0.7f)
)
}
}
}
}
}
}
// Mesh option first
item(key = "mesh") {
ChannelRow(
title = meshTitleWithCount(viewModel),
subtitle = stringResource(R.string.location_bluetooth_subtitle, bluetoothRangeString()),
isSelected = selectedChannel is ChannelID.Mesh,
titleColor = standardBlue,
titleBold = meshCount(viewModel) > 0,
trailingContent = null,
onClick = {
locationManager.select(ChannelID.Mesh)
onDismiss()
}
)
}
// Nearby options (only show if location services are enabled)
if (availableChannels.isNotEmpty() && locationServicesEnabled) {
items(availableChannels) { channel ->
val coverage = coverageString(channel.geohash.length)
val nameBase = locationNames[channel.level]
val namePart = nameBase?.let { formattedNamePrefix(channel.level) + it }
val subtitlePrefix = "#${channel.geohash}$coverage"
val participantCount = geohashParticipantCounts[channel.geohash] ?: 0
val highlight = participantCount > 0
val isBookmarked = bookmarksStore.isBookmarked(channel.geohash)
ChannelRow(
title = geohashTitleWithCount(channel, participantCount),
subtitle = subtitlePrefix + (namePart?.let { " • $it" } ?: ""),
isSelected = isChannelSelected(channel, selectedChannel),
titleColor = standardGreen,
titleBold = highlight,
trailingContent = {
IconButton(onClick = { bookmarksStore.toggle(channel.geohash) }) {
Icon(
imageVector = if (isBookmarked) Icons.Filled.Bookmark else Icons.Outlined.BookmarkBorder,
contentDescription = if (isBookmarked) stringResource(R.string.cd_remove_bookmark) else stringResource(R.string.cd_add_bookmark),
tint = MaterialTheme.colorScheme.onSurface.copy(alpha = 0.8f),
)
}
},
onClick = {
// Selecting a suggested nearby channel is not a teleport
locationManager.setTeleported(false)
locationManager.select(ChannelID.Location(channel))
onDismiss()
}
)
}
} else if (permissionState == LocationChannelManager.PermissionState.AUTHORIZED && locationServicesEnabled) {
item {
Row(
horizontalArrangement = Arrangement.spacedBy(4.dp),
verticalAlignment = Alignment.CenterVertically
) {
CircularProgressIndicator(modifier = Modifier.size(16.dp))
Text(
text = stringResource(R.string.finding_nearby_channels),
fontSize = 12.sp,
fontFamily = FontFamily.Monospace
)
}
}
}
// Bookmarked geohashes
if (bookmarks.isNotEmpty()) {
item(key = "bookmarked_header") {
Text(
text = stringResource(R.string.bookmarked),
style = MaterialTheme.typography.labelLarge,
fontFamily = FontFamily.Monospace,
color = MaterialTheme.colorScheme.onBackground.copy(alpha = 0.7f),
modifier = Modifier
.fillMaxWidth()
.padding(horizontal = 24.dp)
.padding(top = 8.dp, bottom = 4.dp)
)
}
items(bookmarks) { gh ->
val level = levelForLength(gh.length)
val channel = GeohashChannel(level = level, geohash = gh)
val coverage = coverageString(gh.length)
val subtitlePrefix = "#${gh}$coverage"
val name = bookmarkNames[gh]
val subtitle = subtitlePrefix + (name?.let { " • ${formattedNamePrefix(level)}$it" } ?: "")
val participantCount = geohashParticipantCounts[gh] ?: 0
val title = geohashHashTitleWithCount(gh, participantCount)
ChannelRow(
title = title,
subtitle = subtitle,
isSelected = isChannelSelected(channel, selectedChannel),
titleColor = null,
titleBold = participantCount > 0,
trailingContent = {
IconButton(onClick = { bookmarksStore.toggle(gh) }) {
Icon(
imageVector = Icons.Filled.Bookmark,
contentDescription = stringResource(R.string.cd_remove_bookmark),
tint = MaterialTheme.colorScheme.onSurface.copy(alpha = 0.8f),
)
}
},
onClick = {
// For bookmarked selection, mark teleported based on regional membership
val inRegional = availableChannels.any { it.geohash == gh }
if (!inRegional && availableChannels.isNotEmpty()) {
locationManager.setTeleported(true)
} else {
locationManager.setTeleported(false)
}
locationManager.select(ChannelID.Location(channel))
onDismiss()
}
)
LaunchedEffect(gh) { bookmarksStore.resolveNameIfNeeded(gh) }
}
}
// Custom geohash teleport (iOS-style inline form)
item(key = "custom_geohash") {
Surface(
color = Color.Transparent,
shape = MaterialTheme.shapes.medium,
modifier = Modifier
.fillMaxWidth()
.padding(horizontal = 24.dp, vertical = 2.dp)
) {
Row(
modifier = Modifier
.fillMaxWidth()
.padding(horizontal = 16.dp, vertical = 6.dp),
horizontalArrangement = Arrangement.spacedBy(8.dp),
verticalAlignment = Alignment.CenterVertically
) {
Text(
text = stringResource(R.string.hash_symbol),
fontSize = BASE_FONT_SIZE.sp,
fontFamily = FontFamily.Monospace,
color = MaterialTheme.colorScheme.onSurface.copy(alpha = 0.6f)
)
BasicTextField(
value = customGeohash,
onValueChange = { newValue ->
// iOS-style geohash validation (base32 characters only)
val allowed = "0123456789bcdefghjkmnpqrstuvwxyz".toSet()
val filtered = newValue
.lowercase()
.replace("#", "")
.filter { it in allowed }
.take(12)
customGeohash = filtered
customError = null
},
textStyle = androidx.compose.ui.text.TextStyle(
fontSize = BASE_FONT_SIZE.sp,
fontFamily = FontFamily.Monospace,
color = MaterialTheme.colorScheme.onSurface
),
modifier = Modifier
.weight(1f)
.onFocusChanged { focusState ->
isInputFocused = focusState.isFocused
if (focusState.isFocused) {
coroutineScope.launch {
sheetState.expand()
// Scroll to bottom to show input and remove button
listState.animateScrollToItem(
index = listState.layoutInfo.totalItemsCount - 1
)
}
}
},
singleLine = true,
decorationBox = { innerTextField ->
if (customGeohash.isEmpty()) {
Text(
text = stringResource(R.string.geohash_placeholder),
fontSize = BASE_FONT_SIZE.sp,
fontFamily = FontFamily.Monospace,
color = MaterialTheme.colorScheme.onSurface.copy(alpha = 0.4f)
)
}
innerTextField()
}
)
val normalized = customGeohash.trim().lowercase().replace("#", "")
// Map picker button
IconButton(onClick = {
val initial = when {
normalized.isNotBlank() -> normalized
selectedChannel is ChannelID.Location -> (selectedChannel as ChannelID.Location).channel.geohash
else -> ""
}
val intent = Intent(context, GeohashPickerActivity::class.java).apply {
putExtra(GeohashPickerActivity.EXTRA_INITIAL_GEOHASH, initial)
}
mapPickerLauncher.launch(intent)
}) {
Icon(
imageVector = Icons.Filled.Map,
contentDescription = stringResource(R.string.cd_open_map),
tint = MaterialTheme.colorScheme.onSurface.copy(alpha = 0.8f)
)
}
val isValid = validateGeohash(normalized)
// iOS-style teleport button
Button(
onClick = {
if (isValid) {
val level = levelForLength(normalized.length)
val channel = GeohashChannel(level = level, geohash = normalized)
// Mark this selection as a manual teleport
locationManager.setTeleported(true)
locationManager.select(ChannelID.Location(channel))
onDismiss()
} else {
customError = context.getString(R.string.invalid_geohash)
}
},
enabled = isValid,
colors = ButtonDefaults.buttonColors(
containerColor = MaterialTheme.colorScheme.secondary.copy(alpha = 0.12f),
contentColor = MaterialTheme.colorScheme.onSurface
)
) {
Row(
horizontalArrangement = Arrangement.spacedBy(4.dp),
verticalAlignment = Alignment.CenterVertically
) {
Text(
text = stringResource(R.string.teleport),
fontSize = BASE_FONT_SIZE.sp,
fontFamily = FontFamily.Monospace
)
Icon(
imageVector = Icons.Filled.PinDrop,
contentDescription = stringResource(R.string.cd_teleport),
modifier = Modifier.size(14.dp),
tint = MaterialTheme.colorScheme.onSurface
)
}
}
}
}
}
// Error message for custom geohash
if (customError != null) {
item(key = "geohash_error") {
Text(
text = customError!!,
fontSize = 12.sp,
fontFamily = FontFamily.Monospace,
color = Color.Red,
modifier = Modifier
.fillMaxWidth()
.padding(horizontal = 24.dp)
)
}
}
// Location services toggle button
item(key = "location_toggle") {
Column(
modifier = Modifier
.fillMaxWidth()
.padding(horizontal = 24.dp)
.padding(top = 8.dp)
) {
Button(
onClick = {
if (locationServicesEnabled) {
locationManager.disableLocationServices()
} else {
locationManager.enableLocationServices()
}
},
colors = ButtonDefaults.buttonColors(
containerColor = if (locationServicesEnabled) {
Color.Red.copy(alpha = 0.08f)
} else {
standardGreen.copy(alpha = 0.12f)
},
contentColor = if (locationServicesEnabled) {
Color(0xFFBF1A1A)
} else {
standardGreen
}
),
modifier = Modifier.fillMaxWidth()
) {
Text(
text = if (locationServicesEnabled) stringResource(R.string.disable_location_services) else stringResource(R.string.enable_location_services),
fontSize = 12.sp,
fontFamily = FontFamily.Monospace
)
}
}
}
}
// TopBar (animated)
Box(
modifier = Modifier
.align(Alignment.TopCenter)
.fillMaxWidth()
.height(56.dp)
.background(MaterialTheme.colorScheme.background.copy(alpha = topBarAlpha))
) {
TextButton(
onClick = onDismiss,
modifier = Modifier
.align(Alignment.CenterEnd)
.padding(horizontal = 16.dp)
) {
Text(
text = stringResource(R.string.close_plain),
style = MaterialTheme.typography.labelMedium.copy(fontWeight = FontWeight.Bold),
color = MaterialTheme.colorScheme.onBackground
)
}
}
}
}
}
// Lifecycle management: when presented, sample both nearby and bookmarked geohashes
LaunchedEffect(isPresented, availableChannels, bookmarks) {
if (isPresented) {
if (permissionState == LocationChannelManager.PermissionState.AUTHORIZED && locationServicesEnabled) {
locationManager.refreshChannels()
}
if (locationServicesEnabled) {
locationManager.beginLiveRefresh()
}
val geohashes = (availableChannels.map { it.geohash } + bookmarks).toSet().toList()
viewModel.beginGeohashSampling(geohashes)
} else {
locationManager.endLiveRefresh()
viewModel.endGeohashSampling()
}
}
// React to permission changes
LaunchedEffect(permissionState) {
if (permissionState == LocationChannelManager.PermissionState.AUTHORIZED && locationServicesEnabled) {
locationManager.refreshChannels()
}
}
// React to location services enable/disable
LaunchedEffect(locationServicesEnabled) {
if (locationServicesEnabled && permissionState == LocationChannelManager.PermissionState.AUTHORIZED) {
locationManager.refreshChannels()
}
}
}
@Composable
private fun ChannelRow(
title: String,
subtitle: String,
isSelected: Boolean,
titleColor: Color? = null,
titleBold: Boolean = false,
trailingContent: (@Composable (() -> Unit))? = null,
onClick: () -> Unit
) {
// iOS-style list row (plain button, no card background)
Surface(
onClick = onClick,
color = if (isSelected) {
MaterialTheme.colorScheme.primaryContainer.copy(alpha = 0.15f)
} else {
Color.Transparent
},
shape = MaterialTheme.shapes.medium,
modifier = Modifier
.fillMaxWidth()
.padding(horizontal = 24.dp, vertical = 2.dp)
) {
Row(
modifier = Modifier
.fillMaxWidth()
.padding(horizontal = 16.dp, vertical = 6.dp),
horizontalArrangement = Arrangement.SpaceBetween,
verticalAlignment = Alignment.CenterVertically
) {
Column(
modifier = Modifier.weight(1f),
verticalArrangement = Arrangement.spacedBy(2.dp)
) {
// Split title to handle count part with smaller font (iOS style)
val (baseTitle, countSuffix) = splitTitleAndCount(title)
Row(horizontalArrangement = Arrangement.spacedBy(4.dp)) {
Text(
text = baseTitle,
fontSize = BASE_FONT_SIZE.sp,
fontFamily = FontFamily.Monospace,
fontWeight = if (titleBold) FontWeight.Bold else FontWeight.Normal,
color = titleColor ?: MaterialTheme.colorScheme.onSurface
)
countSuffix?.let { count ->
Text(
text = count,
fontSize = 11.sp,
fontFamily = FontFamily.Monospace,
color = MaterialTheme.colorScheme.onSurface.copy(alpha = 0.6f)
)
}
}
Text(
text = subtitle,
fontSize = 12.sp,
fontFamily = FontFamily.Monospace,
color = MaterialTheme.colorScheme.onSurface.copy(alpha = 0.6f)
)
}
Row(verticalAlignment = Alignment.CenterVertically) {
if (isSelected) {
Icon(
imageVector = Icons.Filled.Check,
contentDescription = stringResource(R.string.cd_selected),
tint = Color(0xFF32D74B), // iOS green for checkmark
modifier = Modifier.size(20.dp)
)
}
if (trailingContent != null) {
trailingContent()
}
}
}
}
}
// MARK: - Helper Functions (matching iOS implementation)
private fun splitTitleAndCount(title: String): Pair<String, String?> {
val lastBracketIndex = title.lastIndexOf('[')
return if (lastBracketIndex != -1) {
val prefix = title.substring(0, lastBracketIndex).trim()
val suffix = title.substring(lastBracketIndex)
Pair(prefix, suffix)
} else {
Pair(title, null)
}
}
@Composable
private fun meshTitleWithCount(viewModel: ChatViewModel): String {
val meshCount = meshCount(viewModel)
val ctx = androidx.compose.ui.platform.LocalContext.current
val peopleText = ctx.resources.getQuantityString(com.bitchat.android.R.plurals.people_count, meshCount, meshCount)
val meshLabel = stringResource(com.bitchat.android.R.string.mesh_label)
return "$meshLabel [$peopleText]"
}
private fun meshCount(viewModel: ChatViewModel): Int {
val myID = viewModel.meshService.myPeerID
return viewModel.connectedPeers.value?.count { peerID ->
peerID != myID
} ?: 0
}
@Composable
private fun geohashTitleWithCount(channel: GeohashChannel, participantCount: Int): String {
val ctx = androidx.compose.ui.platform.LocalContext.current
val peopleText = ctx.resources.getQuantityString(com.bitchat.android.R.plurals.people_count, participantCount, participantCount)
val levelName = when (channel.level) {
com.bitchat.android.geohash.GeohashChannelLevel.BUILDING -> "Building" // iOS: precision 8 for location notes
com.bitchat.android.geohash.GeohashChannelLevel.BLOCK -> stringResource(com.bitchat.android.R.string.location_level_block)
com.bitchat.android.geohash.GeohashChannelLevel.NEIGHBORHOOD -> stringResource(com.bitchat.android.R.string.location_level_neighborhood)
com.bitchat.android.geohash.GeohashChannelLevel.CITY -> stringResource(com.bitchat.android.R.string.location_level_city)
com.bitchat.android.geohash.GeohashChannelLevel.PROVINCE -> stringResource(com.bitchat.android.R.string.location_level_province)
com.bitchat.android.geohash.GeohashChannelLevel.REGION -> stringResource(com.bitchat.android.R.string.location_level_region)
}
return "$levelName [$peopleText]"
}
@Composable
private fun geohashHashTitleWithCount(geohash: String, participantCount: Int): String {
val ctx = androidx.compose.ui.platform.LocalContext.current
val peopleText = ctx.resources.getQuantityString(com.bitchat.android.R.plurals.people_count, participantCount, participantCount)
return "#$geohash [$peopleText]"
}
private fun isChannelSelected(channel: GeohashChannel, selectedChannel: ChannelID?): Boolean {
return when (selectedChannel) {
is ChannelID.Location -> selectedChannel.channel == channel
else -> false
}
}
private fun validateGeohash(geohash: String): Boolean {
if (geohash.isEmpty() || geohash.length > 12) return false
val allowed = "0123456789bcdefghjkmnpqrstuvwxyz".toSet()
return geohash.all { it in allowed }
}
private fun levelForLength(length: Int): GeohashChannelLevel {
return when (length) {
in 0..2 -> GeohashChannelLevel.REGION
in 3..4 -> GeohashChannelLevel.PROVINCE
5 -> GeohashChannelLevel.CITY
6 -> GeohashChannelLevel.NEIGHBORHOOD
7 -> GeohashChannelLevel.BLOCK
8 -> GeohashChannelLevel.BUILDING // iOS: precision 8 for building-level
else -> if (length > 8) GeohashChannelLevel.BUILDING else GeohashChannelLevel.BLOCK
}
}
private fun coverageString(precision: Int): String {
// Approximate max cell dimension at equator for a given geohash length
val maxMeters = when (precision) {
2 -> 1_250_000.0
3 -> 156_000.0
4 -> 39_100.0
5 -> 4_890.0
6 -> 1_220.0
7 -> 153.0
8 -> 38.2
9 -> 4.77
10 -> 1.19
else -> if (precision <= 1) 5_000_000.0 else 1.19 * Math.pow(0.25, (precision - 10).toDouble())
}
// Use metric system for simplicity (could be made locale-aware)
val km = maxMeters / 1000.0
return "~${formatDistance(km)} km"
}
private fun formatDistance(value: Double): String {
return when {
value >= 100 -> String.format("%.0f", value)
value >= 10 -> String.format("%.1f", value)
else -> String.format("%.1f", value)
}
}
private fun bluetoothRangeString(): String {
// Approximate Bluetooth LE range for typical mobile devices
return "~1050 m"
}
private fun formattedNamePrefix(level: GeohashChannelLevel): String {
return "~"
}