Changed delete behavior, so that deleting a car also removes all maintenance jobs associated to the car

Author: frvnzz

app/src/main/java/com/example/autocaretracker/MainActivity.kt

@@ -27,7 +27,7 @@ import com.example.autocaretracker.data.AutoCareTrackerDatabase
 class MainActivity : ComponentActivity() {
     private val carDao by lazy { AutoCareTrackerDatabase.getDatabase(this).carDao() }
     private val maintenanceDao by lazy { AutoCareTrackerDatabase.getDatabase(this).maintenanceDao() }
-    private val carRepository by lazy { CarRepository(carDao) }
+    private val carRepository by lazy { CarRepository(carDao, maintenanceDao) }
     private val maintenanceRepository by lazy { MaintenanceRepository(maintenanceDao) }
 
     private val requestPermissionLauncher = registerForActivityResult(

app/src/main/java/com/example/autocaretracker/data/CarRepository.kt

@@ -2,7 +2,7 @@ package com.example.autocaretracker.data
 
 import kotlinx.coroutines.flow.Flow
 
-class CarRepository(private val carDao: CarDao) {
+class CarRepository(private val carDao: CarDao, private val maintenanceDao: MaintenanceDao) {
     val allCars: Flow<List<Car>> = carDao.getAllCars()
 
     fun getCarById(carId: Int): Flow<Car?> {
@@ -20,4 +20,9 @@ class CarRepository(private val carDao: CarDao) {
     suspend fun delete(carId: Int) {
         carDao.delete(carId)
     }
+
+    suspend fun deleteCarAndMaintenance(carId: Int) {
+        carDao.delete(carId)
+        maintenanceDao.deleteMaintenanceForCar(carId)
+    }
 }

app/src/main/java/com/example/autocaretracker/data/MaintenanceDao.kt

@@ -15,4 +15,7 @@ interface MaintenanceDao {
 
     @Query("DELETE FROM maintenance WHERE maintenance_id = :maintenanceId")
     suspend fun delete(maintenanceId: Int)
+
+    @Query("DELETE FROM maintenance WHERE car_id = :carId")
+    suspend fun deleteMaintenanceForCar(carId: Int)
 }

app/src/main/java/com/example/autocaretracker/ui/ViewCarDetailScreen.kt

@@ -18,7 +18,6 @@ import androidx.compose.ui.unit.dp
 import androidx.lifecycle.viewmodel.compose.viewModel
 import androidx.navigation.NavController
 import coil.compose.rememberAsyncImagePainter
-import coil.compose.rememberImagePainter
 import com.example.autocaretracker.R
 import com.example.autocaretracker.data.CarRepository
 import com.example.autocaretracker.data.Car
@@ -43,6 +42,7 @@ fun ViewCarDetailScreen(
 
         val car = carState.value
         var showDialog by remember { mutableStateOf(false) }
+        var showDeleteCarDialog by remember { mutableStateOf(false) }
         var maintenanceToDelete by remember { mutableStateOf<Maintenance?>(null) }
 
         ConfirmDialog(
@@ -56,6 +56,25 @@ fun ViewCarDetailScreen(
             text = "Are you sure you want to delete this maintenance item?"
         )
 
+        ConfirmDialog(
+            showDialog = showDeleteCarDialog,
+            onDismiss = { showDeleteCarDialog = false },
+            onConfirm = {
+                car?.let { carViewModel.deleteCarAndMaintenance(it.car_id) }
+                showDeleteCarDialog = false
+                navController.navigate("view_cars") {
+                    popUpTo("view_car_detail/$carId") { inclusive = true }
+                    launchSingleTop = true
+                    anim {
+                        enter = 0
+                        exit = 0
+                    }
+                }
+            },
+            title = "Confirm Delete",
+            text = "Are you sure you want to delete this car and all its maintenance items?"
+        )
+
         car?.let { carDetail: Car ->
             val latestMaintenance = maintenanceItems.value.maxByOrNull { it.date }
             val lastUpdatedDate = latestMaintenance?.let { SimpleDateFormat("dd/MM/yyyy", Locale.getDefault()).format(Date(it.date)) }
@@ -112,7 +131,7 @@ fun ViewCarDetailScreen(
                         )
                     }
                     IconButton(
-                        onClick = { showDialog = true },
+                        onClick = { showDeleteCarDialog = true },
                         modifier = Modifier.size(56.dp)
                     ) {
                         Icon(

app/src/main/java/com/example/autocaretracker/ui/ViewCarsScreen.kt

@@ -53,11 +53,11 @@ fun ViewCarsScreen(navController: NavController, carRepository: CarRepository) {
             showDialog = showDialog,
             onDismiss = { showDialog = false },
             onConfirm = {
-                carToDelete?.let { carViewModel.delete(it) }
+                carToDelete?.let { carViewModel.deleteCarAndMaintenance(it) }
                 showDialog = false
             },
             title = "Confirm Delete",
-            text = "Are you sure you want to delete this car?"
+            text = "Are you sure you want to delete this car and all its maintenance items?"
         )
 
         Box(modifier = Modifier.fillMaxSize()) {

app/src/main/java/com/example/autocaretracker/ui/ViewModels.kt

@@ -28,6 +28,10 @@ class CarViewModel(private val repository: CarRepository) : ViewModel() {
     fun delete(carId: Int) = viewModelScope.launch {
         repository.delete(carId)
     }
+
+    fun deleteCarAndMaintenance(carId: Int) = viewModelScope.launch {
+        repository.deleteCarAndMaintenance(carId)
+    }
 }
 
 class CarViewModelFactory(private val repository: CarRepository) : ViewModelProvider.Factory {