createBooking: change checkout date based on property policy while editing checking date

app/src/main/java/com/android/trisolarispms/data/api/model/BookingModels.kt

@@ -112,6 +112,22 @@ data class BookingBillableNightsResponse(
     val billableNights: Long? = null
 )
 
+data class BookingExpectedCheckoutPreviewRequest(
+    val checkInAt: String,
+    val billableNights: Int? = null,
+    val billingMode: BookingBillingMode? = null,
+    val billingCheckinTime: String? = null,
+    val billingCheckoutTime: String? = null
+)
+
+data class BookingExpectedCheckoutPreviewResponse(
+    val expectedCheckOutAt: String? = null,
+    val billableNights: Int? = null,
+    val billingMode: BookingBillingMode? = null,
+    val billingCheckinTime: String? = null,
+    val billingCheckoutTime: String? = null
+)
+
 data class BookingDetailsResponse(
     val id: String? = null,
     val status: String? = null,

app/src/main/java/com/android/trisolarispms/data/api/service/BookingApi.kt

@@ -13,6 +13,8 @@ import com.android.trisolarispms.data.api.model.BookingListItem
 import com.android.trisolarispms.data.api.model.BookingBulkCheckInRequest
 import com.android.trisolarispms.data.api.model.BookingBillableNightsRequest
 import com.android.trisolarispms.data.api.model.BookingBillableNightsResponse
+import com.android.trisolarispms.data.api.model.BookingExpectedCheckoutPreviewRequest
+import com.android.trisolarispms.data.api.model.BookingExpectedCheckoutPreviewResponse
 import com.android.trisolarispms.data.api.model.BookingExpectedDatesRequest
 import com.android.trisolarispms.data.api.model.BookingDetailsResponse
 import com.android.trisolarispms.data.api.model.BookingBalanceResponse
@@ -69,6 +71,12 @@ interface BookingApi {
         @Body body: BookingBillableNightsRequest
     ): Response<BookingBillableNightsResponse>
 
+    @POST("properties/{propertyId}/bookings/expected-checkout-preview")
+    suspend fun previewExpectedCheckout(
+        @Path("propertyId") propertyId: String,
+        @Body body: BookingExpectedCheckoutPreviewRequest
+    ): Response<BookingExpectedCheckoutPreviewResponse>
+
     @POST("properties/{propertyId}/bookings/{bookingId}/billing-policy")
     suspend fun updateBookingBillingPolicy(
         @Path("propertyId") propertyId: String,

app/src/main/java/com/android/trisolarispms/ui/booking/BookingCreateScreen.kt

@@ -66,24 +66,36 @@ fun BookingCreateScreen(
     val transportOptions = listOf("CAR", "BIKE", "TRAIN", "PLANE", "BUS", "FOOT", "CYCLE", "OTHER")
     val billingModeMenuExpanded = remember { mutableStateOf(false) }
     val displayFormatter = remember { DateTimeFormatter.ofPattern("dd-MM-yy HH:mm") }
+    val timeFormatter = remember { DateTimeFormatter.ofPattern("HH:mm") }
     val phoneCountryMenuExpanded = remember { mutableStateOf(false) }
     val phoneCountries = remember { phoneCountryOptions() }
     val phoneCountrySearch = remember { mutableStateOf("") }
 
+    val applyCheckInSelection: (LocalDate, String) -> Unit = { date, time ->
+        checkInDate.value = date
+        checkInTime.value = time
+        val checkInAt = formatBookingIso(date, time)
+        viewModel.onExpectedCheckInAtChange(checkInAt)
+        viewModel.autoSetBillingFromCheckIn(checkInAt)
+        viewModel.refreshExpectedCheckoutPreview(propertyId)
+    }
+
     LaunchedEffect(propertyId) {
         viewModel.reset()
         viewModel.loadBillingPolicy(propertyId)
         val now = OffsetDateTime.now()
-        checkInDate.value = now.toLocalDate()
-        checkInTime.value = now.format(DateTimeFormatter.ofPattern("HH:mm"))
-        val nowIso = now.format(DateTimeFormatter.ISO_OFFSET_DATE_TIME)
-        viewModel.onExpectedCheckInAtChange(nowIso)
-        viewModel.autoSetBillingFromCheckIn(nowIso)
         checkInNow.value = true
         val defaultCheckoutDate = now.toLocalDate().plusDays(1)
         checkOutDate.value = defaultCheckoutDate
         checkOutTime.value = "11:00"
         viewModel.onExpectedCheckOutAtChange(formatBookingIso(defaultCheckoutDate, checkOutTime.value))
+        applyCheckInSelection(now.toLocalDate(), now.format(timeFormatter))
+    }
+
+    LaunchedEffect(state.expectedCheckOutAt) {
+        val parsed = runCatching { OffsetDateTime.parse(state.expectedCheckOutAt) }.getOrNull() ?: return@LaunchedEffect
+        checkOutDate.value = parsed.toLocalDate()
+        checkOutTime.value = parsed.format(timeFormatter)
     }
 
     SaveTopBarScaffold(
@@ -111,11 +123,7 @@ fun BookingCreateScreen(
                         checkInNow.value = enabled
                         if (enabled) {
                             val now = OffsetDateTime.now()
-                            checkInDate.value = now.toLocalDate()
+                            applyCheckInSelection(now.toLocalDate(), now.format(timeFormatter))
-                            checkInTime.value = now.format(DateTimeFormatter.ofPattern("HH:mm"))
-                            val nowIso = now.format(DateTimeFormatter.ISO_OFFSET_DATE_TIME)
-                            viewModel.onExpectedCheckInAtChange(nowIso)
-                            viewModel.autoSetBillingFromCheckIn(nowIso)
                         } else {
                             viewModel.onExpectedCheckInAtChange("")
                         }
@@ -181,6 +189,7 @@ fun BookingCreateScreen(
                             onClick = {
                                 billingModeMenuExpanded.value = false
                                 viewModel.onBillingModeChange(mode)
+                                viewModel.refreshExpectedCheckoutPreview(propertyId)
                             }
                         )
                     }
@@ -191,7 +200,10 @@ fun BookingCreateScreen(
                 BookingTimePickerTextField(
                     value = state.billingCheckoutTime,
                     label = { Text("Billing check-out (HH:mm)") },
-                    onTimeSelected = viewModel::onBillingCheckoutTimeChange,
+                    onTimeSelected = { selectedTime ->
+                        viewModel.onBillingCheckoutTimeChange(selectedTime)
+                        viewModel.refreshExpectedCheckoutPreview(propertyId)
+                    },
                     modifier = Modifier.fillMaxWidth()
                 )
             }
@@ -481,10 +493,7 @@ fun BookingCreateScreen(
             minDate = LocalDate.now(),
             onDismiss = { showCheckInPicker.value = false },
             onConfirm = { date, time ->
-                checkInDate.value = date
+                applyCheckInSelection(date, time)
-                checkInTime.value = time
-                val formatted = formatBookingIso(date, time)
-                viewModel.onExpectedCheckInAtChange(formatted)
                 showCheckInPicker.value = false
             }
         )

app/src/main/java/com/android/trisolarispms/ui/booking/BookingCreateViewModel.kt

@@ -6,6 +6,7 @@ import com.android.trisolarispms.data.api.core.ApiClient
 import com.android.trisolarispms.data.api.model.BookingBillingMode
 import com.android.trisolarispms.data.api.model.BookingCreateRequest
 import com.android.trisolarispms.data.api.model.BookingCreateResponse
+import com.android.trisolarispms.data.api.model.BookingExpectedCheckoutPreviewRequest
 import com.android.trisolarispms.data.api.model.GuestDto
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
@@ -14,10 +15,16 @@ import kotlinx.coroutines.launch
 import java.time.OffsetDateTime
 
 class BookingCreateViewModel : ViewModel() {
+    private companion object {
+        const val DEFAULT_PREVIEW_BILLABLE_NIGHTS = 1
+    }
+
     private val _state = MutableStateFlow(BookingCreateState())
     val state: StateFlow<BookingCreateState> = _state
+    private var expectedCheckoutPreviewRequestId: Long = 0
 
     fun reset() {
+        expectedCheckoutPreviewRequestId = 0
         _state.value = BookingCreateState()
     }
 
@@ -76,6 +83,50 @@ class BookingCreateViewModel : ViewModel() {
         _state.update { it.copy(billingCheckoutTime = value, error = null) }
     }
 
+    fun refreshExpectedCheckoutPreview(propertyId: String) {
+        if (propertyId.isBlank()) return
+        val requestBody = buildExpectedCheckoutPreviewRequest(_state.value) ?: return
+        val requestId = ++expectedCheckoutPreviewRequestId
+        viewModelScope.launch {
+            try {
+                val api = ApiClient.create()
+                val response = api.previewExpectedCheckout(
+                    propertyId = propertyId,
+                    body = requestBody
+                )
+                val expectedCheckOutAt = response.body()?.expectedCheckOutAt?.trim().orEmpty()
+                if (!response.isSuccessful || expectedCheckOutAt.isBlank() || requestId != expectedCheckoutPreviewRequestId) {
+                    return@launch
+                }
+                _state.update { current ->
+                    if (requestId != expectedCheckoutPreviewRequestId) {
+                        current
+                    } else {
+                        current.copy(expectedCheckOutAt = expectedCheckOutAt, error = null)
+                    }
+                }
+            } catch (_: Exception) {
+                // Keep user-entered check-out on preview failures.
+            }
+        }
+    }
+
+    private fun buildExpectedCheckoutPreviewRequest(state: BookingCreateState): BookingExpectedCheckoutPreviewRequest? {
+        val expectedCheckInAt = state.expectedCheckInAt.trim()
+        if (expectedCheckInAt.isBlank()) return null
+        val customBillingCheckoutTime = state.billingCheckoutTime.trim().ifBlank { null }
+        return BookingExpectedCheckoutPreviewRequest(
+            checkInAt = expectedCheckInAt,
+            billableNights = DEFAULT_PREVIEW_BILLABLE_NIGHTS,
+            billingMode = state.billingMode,
+            billingCheckoutTime = if (state.billingMode == BookingBillingMode.CUSTOM_WINDOW) {
+                customBillingCheckoutTime
+            } else {
+                null
+            }
+        )
+    }
+
     fun onPhoneCountryChange(value: String) {
         val option = findPhoneCountryOption(value)
         _state.update { current ->