exception handling

.idea/deploymentTargetDropDown.xml

@@ -1,17 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="deploymentTargetDropDown">
-    <runningDeviceTargetSelectedWithDropDown>
-      <Target>
-        <type value="RUNNING_DEVICE_TARGET" />
-        <deviceKey>
-          <Key>
-            <type value="SERIAL_NUMBER" />
-            <value value="KFRSEQ6DTWWWQOE6" />
-          </Key>
-        </deviceKey>
-      </Target>
-    </runningDeviceTargetSelectedWithDropDown>
-    <timeTargetWasSelectedWithDropDown value="2023-12-17T14:14:18.887820Z" />
-  </component>
-</project>

app/src/main/java/com/example/myapplication/MainComposeActivity.kt

@@ -1,5 +1,6 @@
 package com.example.myapplication
 
+import android.content.Context
 import android.os.Bundle
 import androidx.activity.ComponentActivity
 import androidx.activity.compose.setContent
@@ -20,6 +21,7 @@ class MainComposeActivity : ComponentActivity() {
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         application.deleteDatabase("pmy-db")
+        appContext = applicationContext
         setContent {
             PmudemoTheme(darkTheme = isDarkTheme.value) {
                 LaunchedEffect(key1 = true) {
@@ -40,4 +42,7 @@ class MainComposeActivity : ComponentActivity() {
             }
         }
     }
+    companion object {
+        lateinit var appContext: Context
+    }
 }

app/src/main/java/com/example/myapplication/composeui/Authenticator.kt

@@ -15,21 +15,17 @@ fun Authenticator(
     viewModel: AuthenticatorViewModel = viewModel(factory = AppViewModelProvider.Factory)
 ) {
     val scope = rememberCoroutineScope()
-
     val login = dataStoreManager.getLogin().collectAsState(initial = "").value
 
+    LiveStore.user.value = viewModel.authUiState.user
+
     fun synchronize() {
         scope.launch {
             if (login == "") {
                 LiveStore.user.value = null
                 return@launch
             }
-            val overlap = viewModel.findUserByLogin(login)
+            viewModel.findUserByLogin(login)
-            if (overlap == null) {
-                dataStoreManager.setLogin("")
-                return@launch
-            }
-            LiveStore.user.value = overlap
         }
     }
 

app/src/main/java/com/example/myapplication/composeui/AuthenticatorViewModel.kt

@@ -1,18 +1,27 @@
 package com.example.myapplication.composeui
 
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.setValue
 import com.example.myapplication.database.entities.model.User
 import com.example.myapplication.database.entities.repository.UserRepository
 
 class AuthenticatorViewModel(
     private val userRepository: UserRepository
 ) : MyViewModel() {
-    suspend fun findUserByLogin(login: String): User? {
+    var authUiState by mutableStateOf(AuthenticatorUiState())
-        var user: User? = null
+        private set
+
+    suspend fun findUserByLogin(login: String) {
         runInScope(
             actionSuccess = {
-                user = userRepository.getUser(login)
+                authUiState = AuthenticatorUiState(userRepository.getUser(login))
+            },
+            actionError = {
+                authUiState = AuthenticatorUiState()
             }
         )
-        return user
     }
 }
+
+data class AuthenticatorUiState(val user: User? = null)

app/src/main/java/com/example/myapplication/composeui/Cart.kt

@@ -60,7 +60,6 @@ fun Cart(
     LaunchedEffect(Unit) {
         viewModel.refreshState()
     }
-
     Cart(
         cartUiState = cartUiState,
         modifier = Modifier

app/src/main/java/com/example/myapplication/composeui/CartViewModel.kt

@@ -3,7 +3,6 @@ package com.example.myapplication.composeui
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.setValue
-import androidx.lifecycle.ViewModel
 import com.example.myapplication.LiveStore
 import com.example.myapplication.database.entities.model.Order
 import com.example.myapplication.database.entities.model.OrderSessionCrossRef
@@ -21,15 +20,21 @@ class CartViewModel(
     private val orderRepository: OrderRepository,
     private val orderSessionRepository: OrderSessionRepository,
     private val userRepository: UserRepository,
-) : ViewModel() {
+) : MyViewModel() {
     private var isLoading: Boolean = false
     var cartUiState by mutableStateOf(CartUiState())
         private set
 
     suspend fun refreshState() {
         val userId: Int = LiveStore.user.value?.uid ?: 0
+        runInScope(
+            actionSuccess = {
                 val cart = userRepository.getCartByUser(userId)
                 cartUiState = CartUiState(cart)
+            }, actionError = {
+                cartUiState = CartUiState()
+            }
+        )
     }
 
     suspend fun addToOrder(sessions: List<SessionFromCart>) {
@@ -39,6 +44,8 @@ class CartViewModel(
         val userId: Int = LiveStore.user.value?.uid ?: return
         if (sessions.isEmpty())
             return
+        runInScope(
+            actionSuccess = {
                 val orderId = orderRepository.insertOrder(Order(0, userId, LocalDateTime.now()))
                 sessions.forEach { session ->
                     orderSessionRepository.insertOrderSession(
@@ -53,24 +60,45 @@ class CartViewModel(
                 userSessionRepository.deleteUserSessions(userId)
                 refreshState()
             }
+        )
+    }
 
     suspend fun removeFromCart(session: Session, count: Int = 0) {
         val userId: Int = LiveStore.user.value?.uid ?: return
-        userSessionRepository.deleteUserSession(UserSessionCrossRef(userId, session.uid, count))
+        runInScope(
+            actionSuccess = {
+                userSessionRepository.deleteUserSession(
+                    UserSessionCrossRef(
+                        userId,
+                        session.uid,
+                        count
+                    )
+                )
                 refreshState()
             }
+        )
+    }
 
-    suspend fun updateFromCart(session: Session, count: Int, availableCount: Int): Boolean {
+    suspend fun updateFromCart(session: Session, count: Int, availableCount: Int) {
-        val userId: Int = LiveStore.user.value?.uid ?: return false
+        val userId: Int = LiveStore.user.value?.uid ?: return
         if (count == 0) {
             removeFromCart(session, count)
-            return false
+            return
         }
         if (count > availableCount)
-            return false
+            return
-        userSessionRepository.updateUserSession(UserSessionCrossRef(userId, session.uid, count))
+        runInScope(
+            actionSuccess = {
+                userSessionRepository.updateUserSession(
+                    UserSessionCrossRef(
+                        userId,
+                        session.uid,
+                        count
+                    )
+                )
                 refreshState()
-        return true
+            }
+        )
     }
 }
 

app/src/main/java/com/example/myapplication/composeui/Report.kt

@@ -25,6 +25,7 @@ import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.unit.dp
 import androidx.lifecycle.viewmodel.compose.viewModel
+import com.example.myapplication.api.ApiStatus
 import com.example.myapplication.api.session.ReportRemote
 import com.example.myapplication.database.entities.composeui.AppViewModelProvider
 import kotlinx.coroutines.launch
@@ -39,6 +40,9 @@ fun Report(
     val dateStateStart = rememberDatePickerState(initialDisplayMode = DisplayMode.Input)
     val dateStateEnd = rememberDatePickerState(initialDisplayMode = DisplayMode.Input)
     val coroutineScope = rememberCoroutineScope()
+
+    when (viewModel.apiStatus) {
+        ApiStatus.DONE -> {
             Column(
                 modifier = Modifier
                     .verticalScroll(rememberScrollState())
@@ -93,6 +97,14 @@ fun Report(
             }
         }
 
+        ApiStatus.LOADING -> LoadingPlaceholder()
+        else -> ErrorPlaceholder(
+            message = viewModel.apiError,
+            onBack = { }
+        )
+    }
+}
+
 @Composable
 fun CardScreen(reportData: List<ReportRemote>) {
     val dateFormatter = DateTimeFormatter.ofPattern("dd.MM.yyyy HH:mm")

app/src/main/java/com/example/myapplication/composeui/ReportViewModel.kt

@@ -3,12 +3,11 @@ package com.example.myapplication.composeui
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.setValue
-import androidx.lifecycle.ViewModel
 import com.example.myapplication.api.session.ReportRemote
 import com.example.myapplication.api.session.RestSessionRepository
 import java.util.Date
 
-class ReportViewModel(private val serialRepository: RestSessionRepository) : ViewModel() {
+class ReportViewModel(private val serialRepository: RestSessionRepository) : MyViewModel() {
     var reportUiState by mutableStateOf(ReportUiState())
         private set
 
@@ -32,11 +31,17 @@ class ReportViewModel(private val serialRepository: RestSessionRepository) : Vie
 
     suspend fun getReport() {
         if (validateInput()) {
+            runInScope(
+                actionSuccess = {
                     val temp = serialRepository.getReport(
                         reportUiState.reportDetails.startDate,
                         reportUiState.reportDetails.endDate
                     )
                     reportResultUiState = ReportResultUiState(temp)
+                }, actionError = {
+                    reportResultUiState = ReportResultUiState()
+                }
+            )
         }
     }
 }

app/src/main/java/com/example/myapplication/composeui/navigation/MainNavbar.kt

@@ -93,10 +93,10 @@ fun Topbar(
 
             Spacer(modifier = Modifier.width(16.dp))
 
-            if (currentScreen?.route == Screen.CinemaList.route) {
             Search(
                 initValue = LiveStore.searchRequest.value ?: "",
                 onDone = {
+                    navController.navigate(Screen.CinemaList.route)
                     LiveStore.searchRequest.value = it
                 },
                 modifier = Modifier
@@ -111,7 +111,6 @@ fun Topbar(
         }
     }
 }
-}
 
 @Composable
 fun Navbar(
@@ -188,7 +187,7 @@ fun Navhost(
             Screen.OrderView.route,
             arguments = listOf(navArgument("id") { type = NavType.IntType })
         ) { backStackEntry ->
-            backStackEntry.arguments?.let { OrderView(it.getInt("id")) }
+            backStackEntry.arguments?.let { OrderView(navController) }
         }
         composable(Screen.Report.route) { Report() }
     }

app/src/main/java/com/example/myapplication/database/entities/composeui/CinemaList.kt

@@ -56,7 +56,6 @@ fun CinemaList(
     LaunchedEffect(searchPattern.value) {
         viewModel.refresh()
     }
-
     Scaffold(
         topBar = {},
         floatingActionButton = {
@@ -99,6 +98,7 @@ fun CinemaList(
     }
 }
 
+
 @Composable
 private fun CinemaList(
     modifier: Modifier = Modifier,

app/src/main/java/com/example/myapplication/database/entities/composeui/CinemaListViewModel.kt

@@ -21,12 +21,16 @@ class CinemaListViewModel(
 
     fun refresh() {
         val name = "%${LiveStore.searchRequest.value}%"
+        runInScope(actionSuccess = {
             val pagingSource = cinemaRepository.getAllCinemas(name)
             cinemaPagingFlow = CinemaPagingFlowState(pagingSource.cachedIn(viewModelScope))
+        })
     }
 
     suspend fun deleteCinema(cinema: Cinema) {
+        runInScope(actionSuccess = {
             cinemaRepository.deleteCinema(cinema)
+        })
     }
 }
 

app/src/main/java/com/example/myapplication/database/entities/composeui/CinemaView.kt

@@ -31,6 +31,9 @@ import androidx.compose.ui.unit.sp
 import androidx.lifecycle.viewmodel.compose.viewModel
 import androidx.navigation.NavController
 import com.example.myapplication.LiveStore
+import com.example.myapplication.api.ApiStatus
+import com.example.myapplication.composeui.ErrorPlaceholder
+import com.example.myapplication.composeui.LoadingPlaceholder
 import com.example.myapplication.composeui.navigation.Screen
 import com.example.myapplication.database.entities.model.Cinema
 import com.example.myapplication.database.entities.model.UserRole
@@ -42,11 +45,11 @@ fun CinemaView(
 ) {
     val cinemaUiState = viewModel.cinemaUiState
     val user = LiveStore.user.observeAsState()
-
     LaunchedEffect(Unit) {
         viewModel.refreshState()
     }
-
+    when (viewModel.apiStatus) {
+        ApiStatus.DONE -> {
             Column(
                 modifier = Modifier
                     .padding(16.dp)
@@ -143,3 +146,11 @@ fun CinemaView(
                 }
             }
         }
+
+        ApiStatus.LOADING -> LoadingPlaceholder()
+        else -> ErrorPlaceholder(
+            message = viewModel.apiError,
+            onBack = { navController.popBackStack() }
+        )
+    }
+}

app/src/main/java/com/example/myapplication/database/entities/composeui/CinemaViewModel.kt

@@ -4,13 +4,13 @@ import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.setValue
 import androidx.lifecycle.SavedStateHandle
-import androidx.lifecycle.ViewModel
+import com.example.myapplication.composeui.MyViewModel
 import com.example.myapplication.database.entities.model.CinemaWithSessions
 import com.example.myapplication.database.entities.repository.CinemaRepository
 
 class CinemaViewModel(
     savedStateHandle: SavedStateHandle, private val cinemaRepository: CinemaRepository
-) : ViewModel() {
+) : MyViewModel() {
     private val cinemaUid: Int = checkNotNull(savedStateHandle["id"])
 
     var cinemaUiState by mutableStateOf(CinemaUiState())
@@ -18,7 +18,11 @@ class CinemaViewModel(
 
     suspend fun refreshState() {
         if (cinemaUid > 0) {
+            runInScope(actionSuccess = {
                 cinemaUiState = CinemaUiState(cinemaRepository.getCinema(cinemaUid))
+            }, actionError = {
+                cinemaUiState = CinemaUiState()
+            })
         }
     }
 }

app/src/main/java/com/example/myapplication/database/entities/composeui/OrderListViewModel.kt

@@ -1,7 +1,7 @@
 package com.example.myapplication.database.entities.composeui
 
-import androidx.lifecycle.ViewModel
 import androidx.paging.PagingData
+import com.example.myapplication.composeui.MyViewModel
 import com.example.myapplication.database.entities.model.Order
 import com.example.myapplication.database.entities.repository.OrderRepository
 import kotlinx.coroutines.flow.Flow
@@ -9,10 +9,12 @@ import kotlinx.coroutines.flow.emptyFlow
 
 class OrderListViewModel(
     private val orderRepository: OrderRepository
-) : ViewModel() {
+) : MyViewModel() {
     var orderListUiState: Flow<PagingData<Order>> = emptyFlow()
 
     fun refreshState(userId: Int = 0) {
+        runInScope(actionSuccess = {
             orderListUiState = orderRepository.getAllOrders(userId)
+        })
     }
 }

app/src/main/java/com/example/myapplication/database/entities/composeui/OrderView.kt

@@ -1,6 +1,5 @@
 package com.example.myapplication.database.entities.composeui
 
-import android.content.res.Configuration
 import android.graphics.BitmapFactory
 import androidx.compose.foundation.Image
 import androidx.compose.foundation.background
@@ -15,37 +14,41 @@ import androidx.compose.foundation.lazy.LazyColumn
 import androidx.compose.foundation.lazy.items
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.material3.MaterialTheme
-import androidx.compose.material3.Surface
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
-import androidx.compose.runtime.collectAsState
+import androidx.compose.runtime.LaunchedEffect
-import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableIntStateOf
-import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
-import androidx.compose.runtime.rememberCoroutineScope
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.clip
 import androidx.compose.ui.graphics.asImageBitmap
-import androidx.compose.ui.tooling.preview.Preview
 import androidx.compose.ui.unit.dp
 import androidx.lifecycle.viewmodel.compose.viewModel
-import com.example.myapplication.ui.theme.PmudemoTheme
+import androidx.navigation.NavController
+import com.example.myapplication.api.ApiStatus
+import com.example.myapplication.composeui.ErrorPlaceholder
+import com.example.myapplication.composeui.LoadingPlaceholder
 import org.threeten.bp.format.DateTimeFormatter
 
 @Composable
 fun OrderView(
-    id: Int,
+    navController: NavController,
     viewModel: OrderViewModel = viewModel(factory = AppViewModelProvider.Factory)
 ) {
-    val coroutineScope = rememberCoroutineScope()
+    val orderUiState = viewModel.orderUiState
-    val orderUiState by viewModel.orderUiState.collectAsState()
+
+    LaunchedEffect(Unit) {
+        viewModel.refreshState()
+    }
+    when (viewModel.apiStatus) {
+        ApiStatus.DONE -> {
             LazyColumn(
                 modifier = Modifier
                     .padding(10.dp)
             ) {
                 items(orderUiState.sessionList) { session ->
-            val count = remember { mutableStateOf(session.count) }
+                    val count = remember { mutableIntStateOf(session.count) }
                     val dateFormatter = DateTimeFormatter.ofPattern("dd.MM.yyyy HH:mm")
                     val formattedDate = dateFormatter.format(session.dateTime)
 
@@ -89,7 +92,7 @@ fun OrderView(
                                 Text(
                                     text = "${session.cinema.name}, ${session.cinema.year}\n" +
                                             "Цена: ${session.frozenPrice}\n" +
-                                    "Количество: ${count.value}",
+                                            "Количество: $count",
                                     color = MaterialTheme.colorScheme.onSecondary
                                 )
                             }
@@ -99,16 +102,10 @@ fun OrderView(
             }
         }
 
-
+        ApiStatus.LOADING -> LoadingPlaceholder()
-@Preview(name = "Light Mode", showBackground = true, uiMode = Configuration.UI_MODE_NIGHT_NO)
+        else -> ErrorPlaceholder(
-@Preview(name = "Dark Mode", showBackground = true, uiMode = Configuration.UI_MODE_NIGHT_YES)
+            message = viewModel.apiError,
-@Composable
+            onBack = { navController.popBackStack() }
-fun OrderViewPreview() {
+        )
-    PmudemoTheme {
-        Surface(
-            color = MaterialTheme.colorScheme.background
-        ) {
-            OrderView(id = 1)
-        }
     }
 }

app/src/main/java/com/example/myapplication/database/entities/composeui/OrderViewModel.kt

@@ -1,31 +1,29 @@
 package com.example.myapplication.database.entities.composeui
 
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.setValue
 import androidx.lifecycle.SavedStateHandle
-import androidx.lifecycle.ViewModel
+import com.example.myapplication.composeui.MyViewModel
-import androidx.lifecycle.viewModelScope
-import com.example.myapplication.database.AppContainer
 import com.example.myapplication.database.entities.model.SessionFromOrder
 import com.example.myapplication.database.entities.repository.OrderRepository
-import kotlinx.coroutines.flow.SharingStarted
-import kotlinx.coroutines.flow.StateFlow
-import kotlinx.coroutines.flow.flow
-import kotlinx.coroutines.flow.map
-import kotlinx.coroutines.flow.stateIn
 
 class OrderViewModel(
     savedStateHandle: SavedStateHandle,
     private val orderRepository: OrderRepository
-) : ViewModel() {
+) : MyViewModel() {
     private val orderUid: Int = checkNotNull(savedStateHandle["id"])
 
-    val orderUiState: StateFlow<OrderUiState> =
+    var orderUiState by mutableStateOf(OrderUiState())
-        flow { emit(orderRepository.getOrder(orderUid)) }.map {
+        private set
-            OrderUiState(it)
+
-        }.stateIn(
+    suspend fun refreshState() {
-            scope = viewModelScope,
+        runInScope(actionSuccess = {
-            started = SharingStarted.WhileSubscribed(stopTimeoutMillis = AppContainer.TIMEOUT),
+            orderUiState = OrderUiState(orderRepository.getOrder(orderUid))
-            initialValue = OrderUiState()
+        }, actionError = {
-        )
+            orderUiState = OrderUiState()
+        })
+    }
 }
 
 data class OrderUiState(val sessionList: List<SessionFromOrder> = listOf())

app/src/main/java/com/example/myapplication/database/entities/composeui/SessionListViewModel.kt

@@ -1,7 +1,7 @@
 package com.example.myapplication.database.entities.composeui
 
-import androidx.lifecycle.ViewModel
 import com.example.myapplication.LiveStore
+import com.example.myapplication.composeui.MyViewModel
 import com.example.myapplication.database.entities.model.Session
 import com.example.myapplication.database.entities.model.SessionFromCinema
 import com.example.myapplication.database.entities.model.UserSessionCrossRef
@@ -11,8 +11,9 @@ import com.example.myapplication.database.entities.repository.UserSessionReposit
 class SessionListViewModel(
     private val sessionRepository: SessionRepository,
     private val userSessionRepository: UserSessionRepository
-) : ViewModel() {
+) : MyViewModel() {
     suspend fun deleteSession(session: SessionFromCinema) {
+        runInScope(actionSuccess = {
             sessionRepository.deleteSession(
                 Session(
                     uid = session.uid,
@@ -22,14 +23,23 @@ class SessionListViewModel(
                     cinemaId = 0
                 )
             )
+        })
     }
 
     suspend fun addSessionInCart(sessionId: Int, count: Int = 1) {
-        try {
         val userId: Int = LiveStore.user.value?.uid ?: return
-            userSessionRepository.insertUserSession(UserSessionCrossRef(userId, sessionId, count))
+        runInScope(actionSuccess = {
+            try {
+                userSessionRepository.insertUserSession(
+                    UserSessionCrossRef(
+                        userId,
+                        sessionId,
+                        count
+                    )
+                )
             } catch (_: Exception) {
 
             }
+        })
     }
 }

app/src/main/java/com/example/myapplication/database/entities/composeui/UserProfile.kt

@@ -34,6 +34,7 @@ import androidx.compose.ui.unit.dp
 import androidx.lifecycle.viewmodel.compose.viewModel
 import androidx.navigation.NavController
 import com.example.myapplication.LiveStore
+import com.example.myapplication.composeui.navigation.Screen
 import com.example.myapplication.datastore.DataStoreManager
 import kotlinx.coroutines.launch
 
@@ -47,11 +48,15 @@ fun UserProfile(
     var isRegistration by remember { mutableStateOf(false) }
     val coroutine = rememberCoroutineScope()
     val errorStringId: Int? = viewModel.userUiState.errorId
-    val errorMessage = if (errorStringId == null) "" else stringResource(errorStringId)
+    val errorMessage =
+        if (errorStringId == null || errorStringId == 0) "" else stringResource(errorStringId)
     val user = LiveStore.user.observeAsState()
 
     LazyColumn {
         item {
+            if (errorStringId == 0) {
+                navController.navigate(Screen.CinemaList.route)
+            }
             if (user.value != null) {
                 Column(
                     modifier = Modifier
@@ -151,7 +156,7 @@ fun UserProfile(
 
                     if (isRegistration) {
                         Button(
-                            onClick = { coroutine.launch { isRegistration = !viewModel.signUp() } },
+                            onClick = { coroutine.launch { viewModel.signUp() } },
                             modifier = Modifier
                                 .fillMaxWidth()
                                 .padding(8.dp)
@@ -169,13 +174,7 @@ fun UserProfile(
                         )
                     } else {
                         Button(
-                            onClick = {
+                            onClick = { coroutine.launch { viewModel.signIn(dataStoreManager) } },
-                                coroutine.launch {
-                                    if (viewModel.signIn(dataStoreManager)) {
-                                        navController.popBackStack()
-                                    }
-                                }
-                            },
                             modifier = Modifier
                                 .fillMaxWidth()
                                 .padding(8.dp)

app/src/main/java/com/example/myapplication/database/entities/composeui/UserProfileViewModel.kt

@@ -1,17 +1,19 @@
 package com.example.myapplication.database.entities.composeui
 
+import android.widget.Toast
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.setValue
-import androidx.lifecycle.ViewModel
+import com.example.myapplication.MainComposeActivity
 import com.example.myapplication.R
+import com.example.myapplication.composeui.MyViewModel
 import com.example.myapplication.database.entities.model.User
 import com.example.myapplication.database.entities.repository.UserRepository
 import com.example.myapplication.datastore.DataStoreManager
 
 class UserProfileViewModel(
     private val userRepository: UserRepository
-) : ViewModel() {
+) : MyViewModel() {
     var userUiState by mutableStateOf(UserUiState())
         private set
 
@@ -22,28 +24,36 @@ class UserProfileViewModel(
         )
     }
 
-    suspend fun signIn(dataStoreManager: DataStoreManager): Boolean {
+    suspend fun signIn(dataStoreManager: DataStoreManager) {
         userUiState.details.passwordConfirm = userUiState.details.password
         var errorId: Int? = validateInput(userUiState.details)
+        runInScope(
+            actionSuccess = {
                 if (errorId == null) {
-            val overlap = userRepository.getUser(userUiState.details.login)
+                    val overlap: User? = userRepository.getUser(userUiState.details.login)
                     if (overlap == null || userUiState.details.password != overlap.password) {
                         errorId = R.string.err_04
+                    } else {
+                        dataStoreManager.setLogin(userUiState.details.login)
+                        errorId = 0
                     }
                 }
                 userUiState = UserUiState(
                     details = userUiState.details,
                     errorId = errorId
                 )
-        if (errorId == null) {
+            }, actionError = {
-            dataStoreManager.setLogin(userUiState.details.login)
+                errorId = R.string.err_06
-            return true
+                userUiState = UserUiState(
-        }
+                    details = userUiState.details,
-        return false
+                    errorId = errorId
+                )
+            })
     }
 
-    suspend fun signUp(): Boolean {
+    suspend fun signUp() {
         var errorId: Int? = validateInput(userUiState.details)
+        runInScope(actionSuccess = {
             if (errorId == null) {
                 val overlap = userRepository.getUser(userUiState.details.login)
                 if (overlap != null) {
@@ -56,9 +66,20 @@ class UserProfileViewModel(
             )
             if (errorId == null) {
                 userRepository.insertUser(userUiState.details.toUser())
-            return true
+                val toast = Toast.makeText(
+                    MainComposeActivity.appContext,
+                    "Вы зарегистрированы",
+                    Toast.LENGTH_SHORT
+                )
+                toast.show()
             }
-        return false
+        }, actionError = {
+            errorId = R.string.err_06
+            userUiState = UserUiState(
+                details = userUiState.details,
+                errorId = errorId
+            )
+        })
     }
 
     private fun validateInput(details: UserDetails = userUiState.details): Int? {

app/src/main/java/com/example/myapplication/database/entities/composeui/edit/CinemaEdit.kt

@@ -22,6 +22,9 @@ import androidx.compose.ui.unit.dp
 import androidx.lifecycle.viewmodel.compose.viewModel
 import androidx.navigation.NavController
 import com.example.myapplication.R
+import com.example.myapplication.api.ApiStatus
+import com.example.myapplication.composeui.ErrorPlaceholder
+import com.example.myapplication.composeui.LoadingPlaceholder
 import com.example.myapplication.database.entities.composeui.AppViewModelProvider
 import com.example.myapplication.ui.theme.PmudemoTheme
 import kotlinx.coroutines.launch
@@ -32,7 +35,8 @@ fun CinemaEdit(
     viewModel: CinemaEditViewModel = viewModel(factory = AppViewModelProvider.Factory),
 ) {
     val coroutineScope = rememberCoroutineScope()
-
+    when (viewModel.apiStatus) {
+        ApiStatus.DONE -> {
             CinemaEdit(
                 cinemaUiState = viewModel.cinemaUiState,
                 onClick = {
@@ -44,6 +48,13 @@ fun CinemaEdit(
                 onUpdate = viewModel::updateUiState,
             )
         }
+        ApiStatus.LOADING -> LoadingPlaceholder()
+        else -> ErrorPlaceholder(
+            message = viewModel.apiError,
+            onBack = { navController.popBackStack() }
+        )
+    }
+}
 
 @Composable
 private fun CinemaEdit(

app/src/main/java/com/example/myapplication/database/entities/composeui/edit/SessionEdit.kt

@@ -24,6 +24,9 @@ import androidx.compose.ui.unit.dp
 import androidx.lifecycle.viewmodel.compose.viewModel
 import androidx.navigation.NavController
 import com.example.myapplication.R
+import com.example.myapplication.api.ApiStatus
+import com.example.myapplication.composeui.ErrorPlaceholder
+import com.example.myapplication.composeui.LoadingPlaceholder
 import com.example.myapplication.database.entities.composeui.AppViewModelProvider
 import kotlinx.coroutines.launch
 import org.threeten.bp.Instant
@@ -39,6 +42,8 @@ fun SessionEdit(
     viewModel: SessionEditViewModel = viewModel(factory = AppViewModelProvider.Factory),
 ) {
     val coroutineScope = rememberCoroutineScope()
+    when (viewModel.apiStatus) {
+        ApiStatus.DONE -> {
             SessionEdit(
                 sessionUiState = viewModel.sessionUiState,
                 onClick = {
@@ -51,6 +56,14 @@ fun SessionEdit(
             )
         }
 
+        ApiStatus.LOADING -> LoadingPlaceholder()
+        else -> ErrorPlaceholder(
+            message = viewModel.apiError,
+            onBack = { navController.popBackStack() }
+        )
+    }
+}
+
 fun Long.toLocalDate(): org.threeten.bp.LocalDate {
     val instant = Instant.ofEpochMilli(this)
     return instant.atZone(ZoneId.systemDefault()).toLocalDate()

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

@@ -25,6 +25,7 @@
     <string name="err_03">Логин занят</string>
     <string name="err_04">Неверный логин или пароль</string>
     <string name="err_05">Не совпадают пароли</string>
+    <string name="err_06">Ошибка сети</string>
     <string name="back">Назад</string>
     <string name="loading">Загрузка…</string>
 </resources>