Add BookingTypeFilterViewModel

Adds a new `BookingTypeFilterViewModel` to manage the state for the booking type filter.
This ViewModel handles the initial selected type and updates the UI state when a new type is selected.

Author: irfano

WooCommerce/src/main/kotlin/com/woocommerce/android/ui/bookings/filter/type/BookingTypeFilterViewModel.kt

@@ -0,0 +1,40 @@
+package com.woocommerce.android.ui.bookings.filter.type
+
+import androidx.lifecycle.SavedStateHandle
+import com.woocommerce.android.viewmodel.ScopedViewModel
+import dagger.assisted.Assisted
+import dagger.assisted.AssistedFactory
+import dagger.assisted.AssistedInject
+import dagger.hilt.android.lifecycle.HiltViewModel
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.update
+import org.wordpress.android.fluxc.network.rest.wpcom.wc.bookings.BookingsFilterOption
+
+@HiltViewModel(assistedFactory = BookingTypeFilterViewModel.Factory::class)
+class BookingTypeFilterViewModel @AssistedInject constructor(
+    @Assisted private val initialType: BookingsFilterOption.BookingType,
+    @Assisted private val onTypeFilterChanged: (BookingsFilterOption.BookingType) -> Unit,
+    savedStateHandle: SavedStateHandle
+) : ScopedViewModel(savedStateHandle) {
+
+    private val _uiState = MutableStateFlow(
+        BookingTypeFilterUiState(selectedType = initialType, onTypeSelected = ::onTypeSelected)
+    )
+    val uiState: StateFlow<BookingTypeFilterUiState> = _uiState
+
+    private fun onTypeSelected(type: BookingsFilterOption.BookingType) {
+        if (_uiState.value.selectedType != type) {
+            _uiState.update { current -> current.copy(selectedType = type) }
+        }
+        onTypeFilterChanged(type)
+    }
+
+    @AssistedFactory
+    interface Factory {
+        fun create(
+            initialType: BookingsFilterOption.BookingType,
+            onTypeFilterChanged: (BookingsFilterOption.BookingType) -> Unit
+        ): BookingTypeFilterViewModel
+    }
+}