Better error handling

app/src/main/java/net/buzzert/kordophonedroid/KordophoneApplication.kt

@@ -1,16 +1,13 @@
 package net.buzzert.kordophonedroid
 
 import android.app.Application
+import androidx.hilt.navigation.compose.hiltViewModel
 import dagger.hilt.android.HiltAndroidApp
 import net.buzzert.kordophonedroid.data.AppContainer
-import net.buzzert.kordophonedroid.data.AppContainerImpl
 
 @HiltAndroidApp
 class KordophoneApplication : Application() {
-    lateinit var container: AppContainer
-
     override fun onCreate() {
         super.onCreate()
-        container = AppContainerImpl()
     }
 }

app/src/main/java/net/buzzert/kordophonedroid/MainActivity.kt

@@ -4,7 +4,6 @@ import android.os.Bundle
 import androidx.activity.ComponentActivity
 import androidx.activity.compose.setContent
 import dagger.hilt.android.AndroidEntryPoint
-import net.buzzert.kordophonedroid.data.AppContainerImpl
 import net.buzzert.kordophonedroid.ui.KordophoneApp
 
 @AndroidEntryPoint
@@ -12,9 +11,8 @@ class MainActivity : ComponentActivity() {
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
 
-        val container = (application as KordophoneApplication).container
         setContent {
-            KordophoneApp(appContainer = container)
+            KordophoneApp()
         }
     }
 }

app/src/main/java/net/buzzert/kordophonedroid/data/AppContainerImpl.kt

@@ -1,18 +1,15 @@
 package net.buzzert.kordophonedroid.data
 
+import androidx.lifecycle.ViewModel
 import androidx.lifecycle.ViewModelStore
 import androidx.lifecycle.ViewModelStoreOwner
+import dagger.hilt.android.lifecycle.HiltViewModel
 import net.buzzert.kordophone.backend.server.ChatRepository
+import javax.inject.Inject
 
-interface AppContainer: ViewModelStoreOwner {
+@HiltViewModel
+class AppContainer @Inject constructor(
     val repository: ChatRepository
-}
-
-class AppContainerImpl() : AppContainer {
-    override val repository: ChatRepository
-        get() = TODO("Not yet implemented")
-
-    override val viewModelStore: ViewModelStore
-        get() = TODO("Not yet implemented")
-}
+) : ViewModel() {
 
+}

app/src/main/java/net/buzzert/kordophonedroid/ui/KordophoneApp.kt

@@ -1,11 +1,20 @@
 package net.buzzert.kordophonedroid.ui
 
+import androidx.compose.material.AlertDialog
+import androidx.compose.material.Button
 import androidx.compose.material.Text
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
 import androidx.compose.ui.Modifier
+import androidx.hilt.navigation.compose.hiltViewModel
+import androidx.lifecycle.compose.collectAsStateWithLifecycle
 import androidx.navigation.compose.NavHost
 import androidx.navigation.compose.composable
 import androidx.navigation.compose.rememberNavController
+import kotlinx.coroutines.flow.collectLatest
+import net.buzzert.kordophone.backend.server.ChatRepository
 
 import net.buzzert.kordophonedroid.data.AppContainer
 import net.buzzert.kordophonedroid.ui.theme.KordophoneTheme
@@ -19,12 +28,35 @@ sealed class Destination(val route: String) {
     }
 }
 
+@Composable
+fun ErrorDialog(title: String, body: String, onDismiss: () -> Unit) {
+    AlertDialog(
+        onDismissRequest = { onDismiss() },
+        title = { Text(title) },
+        text = { Text(body) },
+        confirmButton = {
+            Button(onClick = { onDismiss() }) {
+                Text("OK")
+            }
+        }
+    )
+}
+
 @Composable
 fun KordophoneApp(
-    appContainer: AppContainer,
+    appContainer: AppContainer = hiltViewModel(),
 ) {
     KordophoneTheme {
         val navController = rememberNavController()
+        val errorVisible = remember { mutableStateOf<ChatRepository.Error?>(null)  }
+        val error = appContainer.repository.errorEncounteredChannel.collectAsStateWithLifecycle(
+            initialValue = null
+        )
+        
+        LaunchedEffect(key1 = error.value) {
+            errorVisible.value = error.value
+        }
+
         NavHost(
             navController = navController,
             startDestination = Destination.ConversationList.route,
@@ -42,5 +74,11 @@ fun KordophoneApp(
                 })
             }
         }
+
+        errorVisible.value?.let {
+            ErrorDialog(title = it.title, body = it.description) {
+                errorVisible.value = null
+            }
+        }
     }
 }