It's working!!!

compose/app/src/main/java/ru/ulstu/is/pmu/tank/composeui/edit/TankEditViewModel.kt

@@ -40,6 +40,10 @@ class TankEditViewModel(
         }
     }
 
+    fun getTankId(): Long{
+        return tankUid;
+    }
+
     fun updateUiState(tankDetails: TankDetails) {
         tankUiState = TankUiState(
             tankDetails = tankDetails,
@@ -58,6 +62,14 @@ class TankEditViewModel(
         }
     }
 
+    suspend fun deleteTank() {
+        if (validateInput()) {
+            if (tankUid > 0) {
+                tankRepository.deleteTank(tankUiState.tankDetails.toTank(tankUid))
+            }
+        }
+    }
+
     private fun validateInput(uiState: TankDetails = tankUiState.tankDetails): Boolean {
         return with(uiState) {
             name.isNotBlank()

compose/app/src/main/java/ru/ulstu/is/pmu/tank/database/AppDatabase.kt

@@ -34,7 +34,7 @@ abstract class AppDatabase : RoomDatabase() {
     abstract fun tankImageDao() : TankImageDao
 
     companion object {
-        private const val DB_NAME: String = "18-db"
+        private const val DB_NAME: String = "19-db"
 
         @Volatile
         private var INSTANCE: AppDatabase? = null

compose/app/src/main/java/ru/ulstu/is/pmu/tanks/composeui/Constructor.kt

@@ -42,6 +42,7 @@ import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
 import androidx.lifecycle.viewmodel.compose.viewModel
 import androidx.navigation.NavController
+import com.application.ui.getEmptyBitmap
 import com.application.ui.miniatureBound
 import com.application.ui.resize
 import com.application.ui.tankImageBound
@@ -75,11 +76,14 @@ fun Constructor(
     nationDropDownViewModel: NationDropDownViewModel = viewModel(factory = AppViewModelProvider.Factory)
 ){
     val coroutineScope = rememberCoroutineScope()
+
+    val tankId = tankEditViewModel.getTankId()
     
     levelDropDownViewModel.setCurrentLevel(tankEditViewModel.tankUiState.tankDetails.levelId ?: 1)
     nationDropDownViewModel.setCurrentNation(tankEditViewModel.tankUiState.tankDetails.nationId ?: 1)
 
     Constructor(
+        tankId = tankId,
         tankViewModel = tankEditViewModel,
         tankUiState = tankEditViewModel.tankUiState,
         levelUiState = levelDropDownViewModel.levelUiState,
@@ -88,12 +92,18 @@ fun Constructor(
         nationUiState = nationDropDownViewModel.nationUiState,
         nationsListUiState = nationDropDownViewModel.nationsListUiState,
         onNationUpdate = nationDropDownViewModel::updateUiState,
-        onClick = {
+        onClickSave = {
             coroutineScope.launch {
                 tankEditViewModel.saveTank()
                 navController.popBackStack()
             }
         },
+        onClickDelete = {
+            coroutineScope.launch {
+                tankEditViewModel.deleteTank()
+                navController.popBackStack()
+            }
+        },
         onUpdate = tankEditViewModel::updateUiState
     )
 }
@@ -200,6 +210,7 @@ private fun NationDropDown(
 @OptIn(ExperimentalMaterial3Api::class)
 @Composable
 private fun Constructor(
+    tankId: Long,
     tankViewModel: TankEditViewModel,
     tankUiState: TankUiState,
     levelUiState: LevelUiState,
@@ -208,7 +219,8 @@ private fun Constructor(
     nationUiState: NationUiState,
     nationsListUiState: NationsListUiState,
     onNationUpdate: (Nation) -> Unit,
-    onClick: () -> Unit,
+    onClickSave: () -> Unit,
+    onClickDelete: () -> Unit,
     onUpdate: (TankDetails) -> Unit
 ) {
     fun handleImageUpload(bitmap: Bitmap) {
@@ -344,7 +356,7 @@ private fun Constructor(
                 }
                 Spacer(Modifier.height(10.dp))
                 Row(
-                    horizontalArrangement = Arrangement.Center,
+                    horizontalArrangement = Arrangement.SpaceAround,
                     modifier = Modifier
                         .fillMaxWidth()
                         .padding(10.dp, 10.dp)
@@ -358,11 +370,27 @@ private fun Constructor(
                             contentColor = Color.Black
                         ),
                         enabled = tankUiState.isEntryValid,
-                        onClick = onClick
+                        onClick = onClickSave
                     ) {
                         //"${student.firstName} ${student.lastName}"
                         Text(text = stringResource(id = R.string.save_account_button), fontSize = 20.sp, fontWeight = FontWeight.Bold)
                     }
+                    if(tankId != 0L){
+                        Button(
+                            modifier = Modifier
+                                .width(200.dp)
+                                .height(50.dp),
+                            colors = ButtonDefaults.buttonColors(
+                                containerColor = CustomOrange,
+                                contentColor = Color.Black
+                            ),
+                            enabled = tankUiState.isEntryValid,
+                            onClick = onClickDelete
+                        ) {
+                            //"${student.firstName} ${student.lastName}"
+                            Text(text = stringResource(id = R.string.delete_account_button), fontSize = 20.sp, fontWeight = FontWeight.Bold)
+                        }
+                    }
                 }
             }
         }
@@ -467,7 +495,7 @@ private fun Constructor(
                             containerColor = CustomOrange,
                             contentColor = Color.Black
                         ),
-                        onClick = onClick
+                        onClick = onClickSave
                     ) {
                         //"${student.firstName} ${student.lastName}"
                         Text(text = stringResource(id = R.string.create_account_button), fontSize = 20.sp, fontWeight = FontWeight.Bold)
@@ -488,6 +516,7 @@ fun ConstructorEditPreview() {
             color = CustomDark
         ) {
             Constructor(
+                tankId = 0L,
                 tankViewModel = viewModel(factory = AppViewModelProvider.Factory),
                 tankUiState = Tank.getTank().toUiState(true),
                 levelUiState = Level.DEMO_LEVEL.toUiState(),
@@ -496,7 +525,8 @@ fun ConstructorEditPreview() {
                 nationUiState = Nation.DEMO_NATION.toUiState(),
                 nationsListUiState = NationsListUiState(listOf()),
                 onNationUpdate = { },
-                onClick = { },
+                onClickSave = { },
+                onClickDelete = { },
                 onUpdate = { },
             )
         }

compose/app/src/main/res/values/strings.xml

@@ -13,6 +13,7 @@
     <string name="login_button">Войти</string>
     <string name="create_account_button">Создать</string>
     <string name="save_account_button">Сохранить</string>
+    <string name="delete_account_button">Удалить</string>
     <string name="register_button">Регистрация</string>
     <string name="student_firstname">Имя</string>
     <string name="student_lastname">Фамилия</string>