Implement Save Trip functionality

feature/trip-planner/state/src/main/kotlin/xyz/ksharma/krail/trip_planner/ui/state/timetable/TimeTableState.kt

@@ -6,6 +6,7 @@ import xyz.ksharma.krail.trip_planner.ui.state.TransportModeLine
 
 data class TimeTableState(
     val isLoading: Boolean = false,
+    val isTripSaved: Boolean = false,
     val journeyList: ImmutableList<JourneyCardInfo> = persistentListOf(),
 ) {
     data class JourneyCardInfo(

feature/trip-planner/state/src/main/kotlin/xyz/ksharma/krail/trip_planner/ui/state/timetable/Trip.kt

@@ -1,8 +1,19 @@
 package xyz.ksharma.krail.trip_planner.ui.state.timetable
 
+import kotlinx.serialization.Serializable
+import kotlinx.serialization.json.Json
+
+@Serializable
 data class Trip(
     val fromStopId: String,
     val fromStopName: String,
     val toStopId: String,
     val toStopName: String,
-)
+) {
+    fun toJsonString() = Json.encodeToString(serializer(), this)
+
+    companion object {
+        fun fromJsonString(json: String) =
+            kotlin.runCatching { Json.decodeFromString(serializer(), json) }.getOrNull()
+    }
+}

feature/trip-planner/ui/build.gradle.kts

@@ -13,6 +13,7 @@ dependencies {
     implementation(projects.core.designSystem)
     implementation(projects.feature.tripPlanner.network.api)
     implementation(projects.feature.tripPlanner.state)
+    implementation(projects.sandook.api)
 
     implementation(libs.compose.foundation)
     implementation(libs.compose.navigation)

feature/trip-planner/ui/src/main/kotlin/xyz/ksharma/krail/trip_planner/ui/timetable/TimeTableScreen.kt

@@ -7,7 +7,9 @@ import androidx.compose.animation.fadeOut
 import androidx.compose.animation.scaleIn
 import androidx.compose.animation.shrinkOut
 import androidx.compose.foundation.background
+import androidx.compose.foundation.clickable
 import androidx.compose.foundation.layout.PaddingValues
+import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.lazy.LazyColumn
 import androidx.compose.foundation.lazy.items
@@ -50,6 +52,16 @@ fun TimeTableScreen(
                 Text("Loading...", modifier = Modifier.padding(horizontal = 16.dp))
             }
         } else if (timeTableState.journeyList.isNotEmpty()) {
+            item {
+                Text(
+                    text = if (timeTableState.isTripSaved) "Trip Saved" else "Save Trip Button",
+                    modifier = Modifier
+                        .fillMaxWidth()
+                        .padding(horizontal = 16.dp, vertical = 16.dp)
+                        .clickable(enabled = !timeTableState.isTripSaved) { onEvent(TimeTableUiEvent.SaveTripButtonClicked) }
+                )
+            }
+
             items(timeTableState.journeyList) { journey ->
 
                 AnimatedVisibility(

feature/trip-planner/ui/src/main/kotlin/xyz/ksharma/krail/trip_planner/ui/timetable/TimeTableViewModel.kt

@@ -16,6 +16,7 @@ import kotlinx.coroutines.launch
 import timber.log.Timber
 import xyz.ksharma.krail.core.date_time.DateTimeHelper.calculateTimeDifferenceFromNow
 import xyz.ksharma.krail.core.date_time.DateTimeHelper.toGenericFormattedTimeString
+import xyz.ksharma.krail.sandook.Sandook
 import xyz.ksharma.krail.trip_planner.network.api.repository.TripPlanningRepository
 import xyz.ksharma.krail.trip_planner.ui.state.timetable.TimeTableState
 import xyz.ksharma.krail.trip_planner.ui.state.timetable.TimeTableUiEvent
@@ -28,6 +29,7 @@ import kotlin.time.Duration.Companion.seconds
 @HiltViewModel
 class TimeTableViewModel @Inject constructor(
     private val tripRepository: TripPlanningRepository,
+    private val sandook: Sandook,
 ) : ViewModel() {
 
     private val _uiState: MutableStateFlow<TimeTableState> = MutableStateFlow(TimeTableState())
@@ -52,7 +54,7 @@ class TimeTableViewModel @Inject constructor(
     private val _expandedJourneyId: MutableStateFlow<String?> = MutableStateFlow(null)
     val expandedJourneyId: StateFlow<String?> = _expandedJourneyId
 
-    var trip: Trip? = null
+    private var tripInfo: Trip? = null
 
     fun onEvent(event: TimeTableUiEvent) {
         when (event) {
@@ -64,11 +66,13 @@ class TimeTableViewModel @Inject constructor(
 
     private fun onSaveTripButtonClicked() {
         Timber.d("Save Trip Button Clicked")
-        // TODO: Implement Save Trip Functionality
-        trip?.let {
-            Timber.d("Save Trip: $it")
-            // TODO save trip to cache
-            // TODO update ui with confirmation / error
+        tripInfo?.let { trip ->
+            Timber.d("Save Trip: $trip")
+            sandook.putString(key = trip.fromStopId + trip.toStopId, trip.toJsonString())
+            sandook.getString(key = trip.fromStopId + trip.toStopId)?.let { savedTrip ->
+                Timber.d("Saved Trip (Pref): ${Trip.fromJsonString(savedTrip)}")
+            }
+            updateUiState { copy(isTripSaved = true) }
         }
     }
 
@@ -79,7 +83,7 @@ class TimeTableViewModel @Inject constructor(
 
     private fun onLoadTimeTable(tripInfo: Trip) = with(tripInfo) {
         Timber.d("loadTimeTable API Call- fromStopItem: ${fromStopId}, toStopItem: ${toStopId}")
-        trip = this
+        this@TimeTableViewModel.tripInfo = this
         updateUiState { copy(isLoading = true) }
 
         viewModelScope.launch {

sandook/api/src/main/kotlin/xyz/ksharma/krail/sandook/Sandook.kt

@@ -1,7 +1,5 @@
 package xyz.ksharma.krail.sandook
 
-import kotlin.reflect.KClass
-
 interface Sandook {
 
     fun clear()