feat: preliminary run info panel, and heavy refactoring

composeApp/src/androidMain/kotlin/moe/lava/banksia/native/maps/Maps.android.kt

@@ -43,6 +43,8 @@ import kotlinx.coroutines.flow.Flow
 import moe.lava.banksia.R
 import moe.lava.banksia.api.ptv.structures.ComposableRouteIcon
 import moe.lava.banksia.native.BanksiaTheme
+import moe.lava.banksia.ui.BanksiaEvent
+import moe.lava.banksia.ui.state.MapState
 import moe.lava.banksia.util.BoxedValue
 import com.google.android.gms.maps.model.CameraPosition as GoogleCameraPosition
 
@@ -64,8 +66,8 @@ actual fun getScreenHeight(): Int {
 @Composable
 actual fun Maps(
     modifier: Modifier,
-    markers: List<Marker>,
+    state: MapState,
-    polylines: List<Polyline>,
+    onEvent: (BanksiaEvent) -> Unit,
     cameraPositionFlow: Flow<BoxedValue<CameraPosition>>,
     setLastKnownLocation: (Point) -> Unit,
     extInsets: WindowInsets,
@@ -115,33 +117,46 @@ actual fun Maps(
         contentPadding = WindowInsets.safeDrawing.add(extInsets).asPaddingValues()
     ) {
         // [TODO]: Slight lag when routes with many stops such as the 901 bus is set
-        for (marker in markers) {
+        for (marker in state.stops) {
             val state = rememberMarkerState()
             state.position = marker.point.toLatLng()
             MarkerComposable(
-                keys = arrayOf(marker.data),
+                keys = arrayOf(marker),
-                zIndex = if (marker.data is Marker.Data.Vehicle) 1f else 0f,
+                zIndex = 0f,
                 state = state,
-                onClick = { marker.onClick() }
+                onClick = {
+                    onEvent(BanksiaEvent.SelectStop(marker.type to marker.id))
+                    false
+                }
             ) {
-                when (marker.data) {
-                    is Marker.Data.Stop ->
                 Box(
                     modifier = Modifier
                         .size(12.dp)
                         .clip(CircleShape)
                         .background(BanksiaTheme.colors.surface)
-                                .border(2.dp, marker.data.colour, CircleShape)
+                        .border(2.dp, marker.colour, CircleShape)
                 )
-                    is Marker.Data.Vehicle ->
+            }
+        }
+        for (marker in state.vehicles) {
+            val state = rememberMarkerState()
+            state.position = marker.point.toLatLng()
+            MarkerComposable(
+                keys = arrayOf(marker),
+                zIndex = 1f,
+                state = state,
+                onClick = {
+                    onEvent(BanksiaEvent.SelectRun(marker.ref))
+                    false
+                }
+            ) {
                 ComposableRouteIcon(
                     size = 30.dp,
-                            routeType = marker.data.type,
+                    routeType = marker.type,
                 )
             }
         }
-        }
+        for (polyline in state.polylines) {
-        for (polyline in polylines) {
             Polyline(
                 points = polyline.points.map { it.toLatLng() },
                 color = polyline.colour

composeApp/src/commonMain/kotlin/moe/lava/banksia/App.kt

@@ -136,13 +136,13 @@ fun App(
         ) {
             Maps(
                 modifier = Modifier.fillMaxSize(),
+                state = mapState,
+                onEvent = viewModel::handleEvent,
                 cameraPositionFlow = viewModel.cameraChangeEmitter,
                 extInsets = WindowInsets(top = with(LocalDensity.current) {
                     SearchBarDefaults.InputFieldHeight.roundToPx()
                 }, bottom = extInsets),
-                markers = mapState.stops + mapState.vehicles,
                 setLastKnownLocation = viewModel::setLastKnownLocation,
-                polylines = mapState.polylines,
             )
             Searcher(
                 state = searchState,

composeApp/src/commonMain/kotlin/moe/lava/banksia/native/maps/Maps.kt

@@ -7,17 +7,25 @@ import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.Color
 import kotlinx.coroutines.flow.Flow
 import moe.lava.banksia.api.ptv.structures.PtvRouteType
+import moe.lava.banksia.ui.BanksiaEvent
+import moe.lava.banksia.ui.state.MapState
 import moe.lava.banksia.util.BoxedValue
 
-data class Marker(
+sealed class Marker {
-    val point: Point,
+    abstract val point: Point
-    val data: Data,
+
-    val onClick: () -> Boolean,
+    data class Stop(
-) {
+        override val point: Point,
-    sealed class Data {
+        val id: Int,
-        data class Stop(val colour: Color) : Data()
+        val type: PtvRouteType,
-        data class Vehicle(val type: PtvRouteType) : Data()
+        val colour: Color,
-    }
+    ) : Marker()
+
+    data class Vehicle(
+        override val point: Point,
+        val ref: String,
+        val type: PtvRouteType,
+    ) : Marker()
 }
 data class Point(val lat: Double, val lng: Double)
 data class Polyline(val points: List<Point>, val colour: Color)
@@ -35,8 +43,8 @@ expect fun getScreenHeight(): Int
 @Composable
 expect fun Maps(
     modifier: Modifier = Modifier,
-    markers: List<Marker> = listOf(),
+    state: MapState,
-    polylines: List<Polyline> = listOf(),
+    onEvent: (BanksiaEvent) -> Unit,
     cameraPositionFlow: Flow<BoxedValue<CameraPosition>>,
     setLastKnownLocation: (Point) -> Unit,
     extInsets: WindowInsets,

composeApp/src/commonMain/kotlin/moe/lava/banksia/ui/BanksiaViewModel.kt

@@ -10,7 +10,9 @@ import kotlinx.coroutines.flow.asSharedFlow
 import kotlinx.coroutines.flow.asStateFlow
 import kotlinx.coroutines.flow.launchIn
 import kotlinx.coroutines.flow.onEach
+import kotlinx.coroutines.flow.takeWhile
 import kotlinx.coroutines.flow.update
+import kotlinx.coroutines.flow.updateAndGet
 import kotlinx.coroutines.launch
 import kotlinx.datetime.Clock
 import kotlinx.datetime.Instant
@@ -34,12 +36,31 @@ sealed class BanksiaEvent {
     data object DismissState : BanksiaEvent()
 
     data class SelectRoute(val id: Int?) : BanksiaEvent()
-    data class SelectStop(val routeType: PtvRouteType, val stopId: Int?) : BanksiaEvent()
+    data class SelectRun(val ref: String?) : BanksiaEvent()
+    data class SelectStop(val typeAndId: Pair<PtvRouteType, Int>) : BanksiaEvent()
 
     data class SearchUpdate(val text: String) : BanksiaEvent()
 }
 
+data class InternalState(
+    val route: Int? = null,
+    val stop: Pair<PtvRouteType, Int>? = null,
+    val run: String? = null,
+)
+
 class BanksiaViewModel : ViewModel() {
+    private var state = InternalState()
+        set(value) {
+            val last = field
+            field = value
+            if (value.route != last.route)
+                viewModelScope.launch { switchRoute(value.route) }
+            if (value.stop != last.stop)
+                viewModelScope.launch { switchStop(value.stop) }
+            if (value.run != last.run)
+                switchRun(value.run)
+        }
+
     private val iInfoState = MutableStateFlow<InfoPanelState>(InfoPanelState.None)
     val infoState = iInfoState.asStateFlow()
 
@@ -64,7 +85,8 @@ class BanksiaViewModel : ViewModel() {
             when (event) {
                 is BanksiaEvent.DismissState -> dismissState()
                 is BanksiaEvent.SelectRoute -> switchRoute(event.id)
-                is BanksiaEvent.SelectStop -> switchStop(event.routeType, event.stopId)
+                is BanksiaEvent.SelectRun -> switchRun(event.ref)
+                is BanksiaEvent.SelectStop -> switchStop(event.typeAndId)
                 is BanksiaEvent.SearchUpdate -> searchUpdate(event.text)
             }
         }
@@ -135,18 +157,49 @@ class BanksiaViewModel : ViewModel() {
         }
 
         viewModelScope.launch { buildPolylines(route) }
-        viewModelScope.launch { buildRuns(route) }
         viewModelScope.launch { buildStops(route) }
-//            viewModelScope.launch { buildDepartures() }
+        buildRuns(route)
-//            viewModelScope.launch { buildRuns() }
     }
 
-    // [TODO]: Cleanup
+    private fun switchRun(ref: String?) {
-    private suspend fun switchStop(routeType: PtvRouteType, stopId: Int?) {
+        if (ref == null) {
-        if (stopId == null) {
             iInfoState.update { InfoPanelState.None }
             return
         }
+
+        var lastState = iInfoState.value
+        var routeName: String? = null
+        ptvService.runFlow(ref, firstWithCache = true)
+            .takeWhile { lastState == iInfoState.value }
+            .onEach { run ->
+                if (routeName == null) {
+                    lastState = iInfoState.updateAndGet {
+                        InfoPanelState.Run(
+                            direction = run.destinationName,
+                            type = run.routeType,
+                        )
+                    }
+                    routeName = ptvService.route(run.routeId).routeName
+                }
+
+                lastState = iInfoState.updateAndGet {
+                    InfoPanelState.Run(
+                        direction = run.destinationName,
+                        type = run.routeType,
+                        routeName = routeName,
+                    )
+                }
+            }
+            .launchIn(viewModelScope)
+    }
+
+    // [TODO]: Cleanup
+    private suspend fun switchStop(typeAndId: Pair<PtvRouteType, Int>?) {
+        if (typeAndId == null) {
+            iInfoState.update { InfoPanelState.None }
+            return
+        }
+        val (routeType, stopId) = typeAndId
         val stop = ptvService.stop(routeType, stopId)
         val split = stop.stopName.split("/")
         val name = split[0]
@@ -229,39 +282,30 @@ class BanksiaViewModel : ViewModel() {
         newCameraPosition?.let { iCameraChangeEmitter.emit(it.box()) }
     }
 
-    private suspend fun buildRuns(route: PtvRoute) {
+    var runsRouteKey: Int? = null
-        val runs = ptvService.runs(route.routeId)
+    private fun buildRuns(route: PtvRoute) {
-
+        runsRouteKey = route.routeId
-        val markers = runs.mapNotNull { it.vehiclePosition }
+        ptvService
-            .distinctBy { it.latitude to it.longitude }
+            .runsFlow(route.routeId)
-            .map {
+            .takeWhile { route.routeId == runsRouteKey }
-                Marker(
+            .onEach { runs ->
-                    Point(it.latitude, it.longitude),
+                val markers = runs
-                    onClick = { false },
+                    .filter { it.vehiclePosition != null }
-                    data = Marker.Data.Vehicle(route.routeType)
+                    .map { it to it.vehiclePosition!! }
+                    .distinctBy { (_, pos) -> pos.latitude to pos.longitude }
+                    .map { (run, pos) ->
+                        Marker.Vehicle(
+                            Point(pos.latitude, pos.longitude),
+                            ref = run.runRef,
+                            type = route.routeType,
                         )
                     }
 
                 iMapState.update { it.copy(vehicles = markers) }
             }
+            .launchIn(viewModelScope)
 
-//    private suspend fun buildDepartures(route: PtvRoute) {
+    }
-//        val directions = ptvService.directionsByRoute(route.routeId)
-//
-//        iState.update {
-//            it.copy(routeState = it.routeState?.copy(directions = directions))
-//        }
-//    }
-//
-//    private suspend fun buildRuns() {
-//        val route = iState.value.routeState?.route ?: return
-//
-//        val directions = ptvService.directionsByRoute(route.routeId)
-//
-//        iState.update {
-//            it.copy(routeState = it.routeState?.copy(directions = directions))
-//        }
-//    }
 
     private suspend fun buildStops(route: PtvRoute) {
         val stops = ptvService.stopsByRoute(route.routeId, route.routeType)
@@ -270,13 +314,11 @@ class BanksiaViewModel : ViewModel() {
         val markers = stops
             .filter { it.stopLatitude != null && it.stopLongitude != null }
             .map { stop ->
-                Marker(
+                Marker.Stop(
                     point = Point(stop.stopLatitude!!, stop.stopLongitude!!),
-                    data = Marker.Data.Stop(colour),
+                    id = stop.stopId,
-                    onClick = {
+                    colour = colour,
-                        viewModelScope.launch { switchStop(route.routeType, stop.stopId) }
+                    type = route.routeType,
-                        false
-                    }
                 )
             }
 

composeApp/src/commonMain/kotlin/moe/lava/banksia/ui/InfoPanel.kt

@@ -57,7 +57,8 @@ fun InfoPanel(
             when (state) {
                 is InfoPanelState.Route -> RouteInfoPanel(state, onEvent)
                 is InfoPanelState.Stop -> StopInfoPanel(state, onEvent)
-                else -> throw UnsupportedOperationException()
+                is InfoPanelState.Run -> RunInfoPanel(state, onEvent)
+                is InfoPanelState.None -> throw UnsupportedOperationException()
             }
 
             if (state.loading)
@@ -87,6 +88,24 @@ private inline fun RouteInfoPanel(
     }
 }
 
+@Composable
+private inline fun RunInfoPanel(
+    state: InfoPanelState.Run,
+    onEvent: (BanksiaEvent) -> Unit,
+) {
+    Column(Modifier.fillMaxWidth()) {
+        Row {
+            ComposableRouteIcon(routeType = state.type)
+            Text(
+                "${state.direction} via ${state.routeName ?: "..."}",
+                style = MaterialTheme.typography.titleLarge,
+                fontWeight = FontWeight.SemiBold,
+                textAlign = TextAlign.Start
+            )
+        }
+    }
+}
+
 @Composable
 private inline fun StopInfoPanel(
     state: InfoPanelState.Stop,

composeApp/src/commonMain/kotlin/moe/lava/banksia/ui/state/InfoPanelState.kt

@@ -16,6 +16,14 @@ sealed class InfoPanelState {
         override val loading = false
     }
 
+    data class Run(
+        val direction: String,
+        val type: PtvRouteType,
+        val routeName: String? = null,
+    ) : InfoPanelState() {
+        override val loading = routeName == null
+    }
+
     data class Stop(
         val id: Int,
         val name: String,

composeApp/src/commonMain/kotlin/moe/lava/banksia/ui/state/MapState.kt

@@ -4,7 +4,7 @@ import moe.lava.banksia.native.maps.Marker
 import moe.lava.banksia.native.maps.Polyline
 
 data class MapState(
-    val stops: List<Marker> = listOf(),
+    val stops: List<Marker.Stop> = listOf(),
-    val vehicles: List<Marker> = listOf(),
+    val vehicles: List<Marker.Vehicle> = listOf(),
     val polylines: List<Polyline> = listOf(),
 )

composeApp/src/iosMain/kotlin/moe/lava/banksia/native/maps/Maps.ios.kt

@@ -7,6 +7,8 @@ import androidx.compose.ui.ExperimentalComposeUiApi
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.platform.LocalWindowInfo
 import kotlinx.coroutines.flow.Flow
+import moe.lava.banksia.ui.BanksiaEvent
+import moe.lava.banksia.ui.state.MapState
 import moe.lava.banksia.util.BoxedValue
 
 @OptIn(ExperimentalComposeUiApi::class)
@@ -19,8 +21,8 @@ actual fun getScreenHeight(): Int {
 @Composable
 actual fun Maps(
     modifier: Modifier,
-    markers: List<Marker>,
+    state: MapState,
-    polylines: List<Polyline>,
+    onEvent: (BanksiaEvent) -> Unit,
     cameraPositionFlow: Flow<BoxedValue<CameraPosition>>,
     setLastKnownLocation: (Point) -> Unit,
     extInsets: WindowInsets,

shared/src/commonMain/kotlin/moe/lava/banksia/api/ptv/PtvService.kt

@@ -10,6 +10,9 @@ import io.ktor.client.request.get
 import io.ktor.client.request.parameter
 import io.ktor.http.appendPathSegments
 import io.ktor.serialization.kotlinx.json.json
+import kotlinx.coroutines.delay
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.flow
 import kotlinx.serialization.Serializable
 import kotlinx.serialization.json.Json
 import moe.lava.banksia.Constants
@@ -44,12 +47,12 @@ object Responses {
     data class PtvDirectionsResponse(val directions: List<PtvDirection>)
 }
 
-
 class PtvService {
     class PtvCache(
         private val service: PtvService,
         private val directions: HashMap<Pair<Int, Int>, PtvDirection> = HashMap(),
         private val routes: HashMap<Int, PtvRoute> = HashMap(),
+        private val runs: HashMap<String, PtvRun> = HashMap(),
         private val stops: HashMap<Int, PtvStop> = HashMap(),
     ) {
         suspend fun direction(directionID: Int, routeID: Int): PtvDirection? {
@@ -79,6 +82,14 @@ class PtvService {
         }
 
         fun getStop(stopId: Int) = stops[stopId]
+
+        fun addRuns(runs: Iterable<PtvRun>) {
+            runs.forEach {
+                this.runs[it.runRef] = it
+            }
+        }
+
+        fun getRun(runRef: String) = runs[runRef]
     }
 
     val cache = PtvCache(this)
@@ -133,8 +144,29 @@ class PtvService {
         return response.routes
     }
 
-    suspend fun runs(routeId: Int): List<PtvRun> {
+    fun runFlow(ref: String, firstWithCache: Boolean = false, intervalMillis: Long = 5000): Flow<PtvRun> = flow {
-        val response: Responses.PtvRunsResponse = client.get() {
+        val cached = cache.getRun(ref)
+        if (firstWithCache && cached != null)
+            emit(cached)
+
+        while (true) {
+            val response: Responses.PtvRunsResponse = client.get {
+                url {
+                    appendPathSegments(
+                        "runs",
+                        ref,
+                    )
+                }
+            }.body()
+            cache.addRuns(response.runs)
+            emit(response.runs[0])
+            delay(intervalMillis)
+        }
+    }
+
+    fun runsFlow(routeId: Int, intervalMillis: Long = 5000): Flow<List<PtvRun>> = flow {
+        while (true) {
+            val response: Responses.PtvRunsResponse = client.get {
                 url {
                     appendPathSegments(
                         "runs",
@@ -144,7 +176,10 @@ class PtvService {
                     parameter("expand", "VehiclePosition")
                 }
             }.body()
-        return response.runs
+            cache.addRuns(response.runs)
+            emit(response.runs)
+            delay(intervalMillis)
+        }
     }
 
     suspend fun stopsByRoute(routeId: Int, routeType: PtvRouteType): List<PtvStop> {