Rework inputs to registration screen component

app/app/src/main/java/ing/bikeshedengineer/debtpirate/app/host/MainActivity.kt

@@ -13,6 +13,8 @@ import androidx.compose.animation.fadeIn
 import androidx.compose.animation.fadeOut
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.collectAsState
+import androidx.hilt.navigation.compose.hiltViewModel
 import androidx.lifecycle.Lifecycle
 import androidx.lifecycle.compose.LocalLifecycleOwner
 import androidx.lifecycle.lifecycleScope
@@ -26,7 +28,9 @@ import dagger.hilt.android.AndroidEntryPoint
 import ing.bikeshedengineer.debtpirate.app.screen.auth.presentation.confirm.ConfirmationData
 import ing.bikeshedengineer.debtpirate.app.screen.auth.presentation.confirm.ConfirmationScreen
 import ing.bikeshedengineer.debtpirate.app.screen.auth.presentation.login.LoginScreen
+import ing.bikeshedengineer.debtpirate.app.screen.auth.presentation.login.LoginScreenViewModel
 import ing.bikeshedengineer.debtpirate.app.screen.auth.presentation.register.RegistrationScreen
+import ing.bikeshedengineer.debtpirate.app.screen.auth.presentation.register.RegistrationScreenViewModel
 import ing.bikeshedengineer.debtpirate.app.screen.home.presentation.overview.OverviewScreen
 import ing.bikeshedengineer.debtpirate.domain.usecase.GetStoredTokensUseCase
 import ing.bikeshedengineer.debtpirate.navigation.Destination
@@ -96,8 +100,42 @@ class MainActivity : ComponentActivity() {
                     navigation<Destination.AuthGraph>(
                         startDestination = Destination.AuthLogin
                     ) {
-                        composable<Destination.AuthLogin> { LoginScreen() }
+                        composable<Destination.AuthLogin> {
-                        composable<Destination.AuthRegistration> { RegistrationScreen() }
+                            val viewModel = hiltViewModel<LoginScreenViewModel>()
+
+                            LoginScreen(
+                                emailAddress = viewModel.emailAddress.collectAsState(""),
+                                isEmailAddressValid = viewModel.isEmailAddressValid.collectAsState(true),
+                                password = viewModel.password.collectAsState(""),
+                                isPasswordValid = viewModel.isPasswordValid.collectAsState(true),
+                                toastMessages = viewModel.toastMessages.collectAsState(""),
+                                onAction = viewModel::onAction,
+                                handleCredentialManagerSignIn = viewModel::handleCredentialManagerSignIn,
+                                onRegisterButtonClick = viewModel::onRegisterButtonClick
+                            )
+                        }
+                        composable<Destination.AuthRegistration> {
+                            val viewModel = hiltViewModel<RegistrationScreenViewModel>()
+
+                            RegistrationScreen(
+                                emailAddress = viewModel.emailAddress.collectAsState(""),
+                                emailAddressError = viewModel.emailAddressError.collectAsState(""),
+                                isEmailAddressValid = viewModel.isEmailAddressValid.collectAsState(true),
+                                name = viewModel.name.collectAsState(""),
+                                nameError = viewModel.nameError.collectAsState(""),
+                                isNameValid = viewModel.isNameValid.collectAsState(true),
+                                password = viewModel.password.collectAsState(""),
+                                passwordError = viewModel.passwordError.collectAsState(""),
+                                isPasswordValid = viewModel.isPasswordValid.collectAsState(true),
+                                confirmPassword = viewModel.confirmPassword.collectAsState(""),
+                                confirmPasswordError = viewModel.confirmPasswordError.collectAsState(""),
+                                isConfirmPasswordValid = viewModel.isConfirmPasswordValid.collectAsState(true),
+                                onAction = viewModel::onAction,
+                                onRegistrationMessage = viewModel.onRegistrationComplete.collectAsState(null),
+                                navigateToConfirmationScreen = viewModel::navigateToConfirmationScreen,
+                                onNavigateUp = viewModel::navigateUp
+                            )
+                        }
                         composable<Destination.AuthRegistrationConfirmation> {
                             val (emailAddress) = it.toRoute<Destination.AuthRegistrationConfirmation>()
                             ConfirmationScreen(

app/app/src/main/java/ing/bikeshedengineer/debtpirate/app/screen/auth/presentation/login/LoginScreen.kt

@@ -3,7 +3,7 @@ package ing.bikeshedengineer.debtpirate.app.screen.auth.presentation.login
 import android.annotation.SuppressLint
 import android.util.Log
 import android.widget.Toast
-import androidx.activity.ComponentActivity
+import androidx.activity.compose.LocalActivity
 import androidx.compose.foundation.background
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
@@ -31,10 +31,8 @@ import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.State
-import androidx.compose.runtime.collectAsState
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
-import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.text.TextStyle
 import androidx.compose.ui.text.input.ImeAction
 import androidx.compose.ui.text.input.KeyboardCapitalization
@@ -44,6 +42,7 @@ import androidx.compose.ui.text.style.TextAlign
 import androidx.compose.ui.unit.dp
 import androidx.credentials.CredentialManager
 import androidx.credentials.GetCredentialRequest
+import androidx.credentials.GetCredentialResponse
 import androidx.credentials.GetPasswordOption
 import androidx.credentials.exceptions.GetCredentialException
 import androidx.credentials.exceptions.NoCredentialException
@@ -52,9 +51,16 @@ import androidx.hilt.navigation.compose.hiltViewModel
 @SuppressLint("UnusedMaterial3ScaffoldPaddingParameter")
 @Composable
 fun LoginScreen(
-    viewModel: LoginScreenViewModel = hiltViewModel<LoginScreenViewModel>()
+    emailAddress: State<String>,
+    isEmailAddressValid: State<Boolean>,
+    password: State<String>,
+    isPasswordValid: State<Boolean>,
+    toastMessages: State<String>,
+    onAction: (LoginScreenStateAction) -> Unit,
+    handleCredentialManagerSignIn: (GetCredentialResponse) -> Unit,
+    onRegisterButtonClick: () -> Unit,
 ) {
-    val context = LocalContext.current as ComponentActivity
+    val context = LocalActivity.current!!
     val credentialManager = CredentialManager.create(context)
     LaunchedEffect(Unit) {
         try {
@@ -64,7 +70,7 @@ fun LoginScreen(
                 )
             )
 
-            viewModel.handleCredentialManagerSignIn(result)
+            handleCredentialManagerSignIn(result)
         } catch (err: GetCredentialException) {
             when (err) {
                 is NoCredentialException -> {
@@ -79,7 +85,6 @@ fun LoginScreen(
         }
     }
 
-    val toastMessages = viewModel.toastMessages.collectAsState("")
     LaunchedEffect(toastMessages.value) {
         val message = toastMessages.value
 
@@ -103,37 +108,28 @@ fun LoginScreen(
                     .weight(3f)
                     .padding(16.dp)
             ) {
-                val emailAddress = viewModel.emailAddress.collectAsState()
-                val isValidEmailAddress = viewModel.isValidEmailAddress.collectAsState(true)
-
-                val password = viewModel.password.collectAsState()
-                val isValidPassword = viewModel.isValidPassword.collectAsState(true)
-
                 LoginComponent(
                     emailAddress,
                     onUpdateEmailAddress = {
-                        viewModel.onAction(
+                        onAction(
                             LoginScreenStateAction.UpdateEmailAddress(
                                 it
                             )
                         )
                     },
-                    isValidEmailAddress,
+                    isEmailAddressValid,
                     password,
                     onUpdatePassword = {
-                        viewModel.onAction(
+                        onAction(
                             LoginScreenStateAction.UpdatePassword(
                                 it
                             )
                         )
                     },
-                    isValidPassword,
+                    isPasswordValid,
                     submitLoginRequest = {
-                        viewModel.onAction(
+                        onAction(
-                            LoginScreenStateAction.ValidateCredentials(
+                            LoginScreenStateAction.ValidateCredentials
-                                emailAddress.value,
-                                password.value
-                            )
                         )
                     }
                 )
@@ -147,7 +143,7 @@ fun LoginScreen(
                     )
                 )
 
-                RegisterButton(viewModel = viewModel)
+                RegisterButton(onRegisterButtonClick)
             }
         }
     }
@@ -258,9 +254,9 @@ private fun Separator(modifier: Modifier = Modifier) {
 }
 
 @Composable
-private fun RegisterButton(viewModel: LoginScreenViewModel) {
+private fun RegisterButton(onRegisterButtonClick: () -> Unit) {
     OutlinedButton(
-        onClick = { viewModel.onRegisterButtonClick() },
+        onClick = { onRegisterButtonClick() },
         modifier = Modifier
             .fillMaxWidth()
     ) {

app/app/src/main/java/ing/bikeshedengineer/debtpirate/app/screen/auth/presentation/login/LoginScreenState.kt

@@ -0,0 +1,10 @@
+package ing.bikeshedengineer.debtpirate.app.screen.auth.presentation.login
+
+data class LoginScreenState(
+    val emailAddress: String,
+    val password: String,
+    val isEmailAddressPristine: Boolean,
+    val isPasswordPristine: Boolean,
+    val isEmailAddressValid: Boolean,
+    val isPasswordValid: Boolean,
+)

app/app/src/main/java/ing/bikeshedengineer/debtpirate/app/screen/auth/presentation/login/LoginScreenStateAction.kt

@@ -3,6 +3,6 @@ package ing.bikeshedengineer.debtpirate.app.screen.auth.presentation.login
 sealed interface LoginScreenStateAction {
     data class UpdateEmailAddress(val emailAddress: String) : LoginScreenStateAction
     data class UpdatePassword(val password: String) : LoginScreenStateAction
-    data class ValidateCredentials(val emailAddress: String, val password: String) : LoginScreenStateAction
+    data object ValidateCredentials : LoginScreenStateAction
-    data class SubmitLoginRequest(val emailAddress: String, val password: String) : LoginScreenStateAction
+    data object SubmitLoginRequest : LoginScreenStateAction
 }

app/app/src/main/java/ing/bikeshedengineer/debtpirate/app/screen/auth/presentation/login/LoginScreenViewModel.kt

@@ -1,6 +1,7 @@
 package ing.bikeshedengineer.debtpirate.app.screen.auth.presentation.login
 
 import android.util.Log
+import android.util.Patterns
 import androidx.credentials.GetCredentialResponse
 import androidx.credentials.PasswordCredential
 import androidx.lifecycle.ViewModel
@@ -17,9 +18,11 @@ import ing.bikeshedengineer.debtpirate.navigation.Navigator
 import kotlinx.coroutines.flow.MutableSharedFlow
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.asSharedFlow
-import kotlinx.coroutines.flow.asStateFlow
+import kotlinx.coroutines.flow.distinctUntilChangedBy
-import kotlinx.coroutines.flow.combine
+import kotlinx.coroutines.flow.launchIn
 import kotlinx.coroutines.flow.map
+import kotlinx.coroutines.flow.onEach
+import kotlinx.coroutines.flow.update
 import kotlinx.coroutines.launch
 import javax.inject.Inject
 
@@ -30,19 +33,48 @@ class LoginScreenViewModel @Inject constructor(
     private val validateLoginCredentials: ValidateLoginCredentialsUseCase,
     private val updateStoreData: UpdateStoreDataUseCase
 ) : ViewModel() {
-    private val _isEmailAddressPristine = MutableStateFlow(true)
+    private val _state = MutableStateFlow(
-    private val _emailAddress = MutableStateFlow("")
+        LoginScreenState(
-    val emailAddress = _emailAddress.asStateFlow()
+            emailAddress = "",
-    val isValidEmailAddress =
+            password = "",
-        _isEmailAddressPristine.combine(_emailAddress.map { it.isNotBlank() }) { isPristine, isValid ->
+            isEmailAddressPristine = true,
-            isPristine || isValid
+            isPasswordPristine = true,
-        }
+            isEmailAddressValid = true,
+            isPasswordValid = true,
+        )
+    )
 
-    private val _isPasswordPristine = MutableStateFlow(true)
+    val emailAddress = _state.map { it.emailAddress }
-    private val _password = MutableStateFlow("")
+    val password = _state.map { it.password }
-    val password = _password.asStateFlow()
+    val isEmailAddressPristine = _state.map { it.isEmailAddressPristine }
-    val isValidPassword = _isPasswordPristine.combine(_password.map { it.isNotBlank() }) { isPristine, isValid ->
+    val isPasswordPristine = _state.map { it.isPasswordPristine }
-        isPristine || isValid
+    val isEmailAddressValid = _state.map { it.isEmailAddressValid }
+    val isPasswordValid = _state.map { it.isPasswordValid }
+
+    init {
+        _state.distinctUntilChangedBy { it.emailAddress }
+            .map { it.emailAddress.isNotBlank() && Patterns.EMAIL_ADDRESS.matcher(it.emailAddress).matches() }
+            .onEach { isEmailAddressValid ->
+                _state.update {
+                    it.copy(
+                        isEmailAddressPristine = false,
+                        isEmailAddressValid = it.isEmailAddressPristine || isEmailAddressValid
+                    )
+                }
+            }
+            .launchIn(viewModelScope)
+
+        _state.distinctUntilChangedBy { it.password }
+            .map { it.password.isNotBlank() }
+            .onEach { isPasswordValid ->
+                _state.update {
+                    it.copy(
+                        isPasswordPristine = false,
+                        isPasswordValid = it.isPasswordPristine || isPasswordValid
+                    )
+                }
+            }
+            .launchIn(viewModelScope)
     }
 
     private val _toastMessages = MutableSharedFlow<String>()
@@ -51,37 +83,32 @@ class LoginScreenViewModel @Inject constructor(
     fun onAction(action: LoginScreenStateAction) {
         when (action) {
             is LoginScreenStateAction.UpdateEmailAddress -> {
-                _emailAddress.value = action.emailAddress
+                _state.update { it.copy(emailAddress = action.emailAddress) }
-                _isEmailAddressPristine.value = false
             }
 
             is LoginScreenStateAction.UpdatePassword -> {
-                _password.value = action.password
+                _state.update { it.copy(password = action.password) }
-                _isPasswordPristine.value = false
             }
 
             is LoginScreenStateAction.ValidateCredentials -> {
-                val (emailAddress, password) = action
+                onValidateLoginCredentials(_state.value.emailAddress, _state.value.password)
-                onValidateLoginCredentials(emailAddress, password)
             }
 
             is LoginScreenStateAction.SubmitLoginRequest -> {
                 viewModelScope.launch {
-                    val (emailAddress, password) = action
+                    onSubmitLoginRequest(_state.value.emailAddress, _state.value.password)
-                    onSubmitLoginRequest(emailAddress, password)
                 }
             }
         }
     }
 
     private fun onValidateLoginCredentials(emailAddress: String, password: String) {
-        _isEmailAddressPristine.value = false
+        _state.update { it.copy(isEmailAddressPristine = true, isPasswordPristine = true) }
-        _isPasswordPristine.value = false
 
         val validationResult = validateLoginCredentials(emailAddress, password)
         when (validationResult) {
             is LoginCredentialsValidationResult.ValidCredentials -> {
-                onAction(LoginScreenStateAction.SubmitLoginRequest(emailAddress, password))
+                onAction(LoginScreenStateAction.SubmitLoginRequest)
             }
 
             else -> {
@@ -131,7 +158,7 @@ class LoginScreenViewModel @Inject constructor(
                 val emailAddress = credentials.id
                 val password = credentials.password
 
-                onAction(LoginScreenStateAction.SubmitLoginRequest(emailAddress, password))
+                onAction(LoginScreenStateAction.SubmitLoginRequest)
             }
 
             else -> {

app/app/src/main/java/ing/bikeshedengineer/debtpirate/app/screen/auth/presentation/register/RegistrationScreen.kt

@@ -29,7 +29,6 @@ import androidx.compose.material3.rememberTopAppBarState
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.State
-import androidx.compose.runtime.collectAsState
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.input.nestedscroll.nestedScroll
@@ -49,17 +48,32 @@ import androidx.compose.ui.unit.sp
 import androidx.credentials.CreatePasswordRequest
 import androidx.credentials.CredentialManager
 import androidx.credentials.exceptions.CreateCredentialException
-import androidx.hilt.navigation.compose.hiltViewModel
 
 @OptIn(ExperimentalMaterial3Api::class)
 @Composable()
 fun RegistrationScreen(
-    viewModel: RegistrationScreenViewModel = hiltViewModel<RegistrationScreenViewModel>()
+    emailAddress: State<String>,
+    emailAddressError: State<String>,
+    isEmailAddressValid: State<Boolean>,
+    name: State<String>,
+    nameError: State<String>,
+    isNameValid: State<Boolean>,
+    password: State<String>,
+    passwordError: State<String>,
+    isPasswordValid: State<Boolean>,
+    confirmPassword: State<String>,
+    confirmPasswordError: State<String>,
+    isConfirmPasswordValid: State<Boolean>,
+    onAction: (RegistrationScreenAction) -> Unit,
+    onRegistrationMessage: State<Pair<String, String>?>,
+    navigateToConfirmationScreen: (String) -> Unit,
+    onNavigateUp: () -> Unit,
 ) {
     val localContext = LocalContext.current
-    val onRegistrationMessage = viewModel.onRegistrationComplete.collectAsState(null)
+
     LaunchedEffect(onRegistrationMessage.value) {
         val message = onRegistrationMessage.value
+
         if (message != null) {
             val (username, password) = message
             val credentialManager = CredentialManager.create(localContext)
@@ -72,13 +86,13 @@ fun RegistrationScreen(
                 // TODO: Display a toast...
             }
 
-            viewModel.navigateToConfirmationScreen(username)
+            navigateToConfirmationScreen(username)
         }
     }
 
     val scrollBehavior = TopAppBarDefaults.pinnedScrollBehavior(rememberTopAppBarState())
     Scaffold(
-        topBar = { RegistrationTopAppBar(onNavigateUp = viewModel::navigateUp) },
+        topBar = { RegistrationTopAppBar(onNavigateUp) },
         modifier = Modifier
             .fillMaxSize()
             .nestedScroll(scrollBehavior.nestedScrollConnection)
@@ -89,7 +103,19 @@ fun RegistrationScreen(
                 .padding(16.dp)
         ) {
             RegistrationComponent(
-                viewModel,
+                emailAddress = emailAddress,
+                emailAddressError = emailAddressError,
+                isEmailAddressValid = isEmailAddressValid,
+                name = name,
+                nameError = nameError,
+                isNameValid = isNameValid,
+                password = password,
+                passwordError = passwordError,
+                isPasswordValid = isPasswordValid,
+                confirmPassword = confirmPassword,
+                confirmPasswordError = confirmPasswordError,
+                isConfirmPasswordValid = isConfirmPasswordValid,
+                onAction = onAction
             )
         }
     }
@@ -126,25 +152,21 @@ private fun RegistrationTopAppBar(onNavigateUp: () -> Unit, modifier: Modifier =
 
 @Composable
 private fun RegistrationComponent(
-    viewModel: RegistrationScreenViewModel,
+    emailAddress: State<String>,
+    emailAddressError: State<String>,
+    isEmailAddressValid: State<Boolean>,
+    name: State<String>,
+    nameError: State<String>,
+    isNameValid: State<Boolean>,
+    password: State<String>,
+    passwordError: State<String>,
+    isPasswordValid: State<Boolean>,
+    confirmPassword: State<String>,
+    confirmPasswordError: State<String>,
+    isConfirmPasswordValid: State<Boolean>,
+    onAction: (RegistrationScreenAction) -> Unit,
     modifier: Modifier = Modifier
 ) {
-    val emailAddress = viewModel.emailAddress.collectAsState()
-    val emailAddressError = viewModel.emailAddressError.collectAsState()
-    val isInvalidEmailAddress = viewModel.isInvalidEmailAddress.collectAsState(false)
-
-    val name = viewModel.name.collectAsState()
-    val nameError = viewModel.nameError.collectAsState()
-    val isInvalidName = viewModel.isInvalidName.collectAsState(false)
-
-    val password = viewModel.password.collectAsState()
-    val passwordError = viewModel.passwordError.collectAsState()
-    val isInvalidPassword = viewModel.isInvalidPassword.collectAsState(false)
-
-    val confirmPassword = viewModel.confirmPassword.collectAsState()
-    val confirmPasswordError = viewModel.confirmPasswordError.collectAsState()
-    val isInvalidConfirmPassword = viewModel.isInvalidConfirmPassword.collectAsState(false)
-
     Column(modifier = modifier.verticalScroll(rememberScrollState())) {
         OutlinedTextField(
             value = emailAddress.value,
@@ -153,13 +175,13 @@ private fun RegistrationComponent(
             supportingText = { Text(text = emailAddressError.value) },
             leadingIcon = { Icon(Icons.Outlined.Mail, "Email") },
             singleLine = true,
-            isError = isInvalidEmailAddress.value,
+            isError = !isEmailAddressValid.value,
             keyboardOptions = KeyboardOptions(
                 capitalization = KeyboardCapitalization.None,
                 keyboardType = KeyboardType.Email,
                 imeAction = ImeAction.Next
             ),
-            onValueChange = { viewModel.onAction(RegistrationScreenAction.UpdateEmailAddress(it)) },
+            onValueChange = { onAction(RegistrationScreenAction.UpdateEmailAddress(it)) },
             modifier = Modifier.fillMaxWidth()
         )
 
@@ -170,13 +192,13 @@ private fun RegistrationComponent(
             supportingText = { Text(text = nameError.value) },
             leadingIcon = { Icon(Icons.Outlined.Person, "Name") },
             singleLine = true,
-            isError = isInvalidName.value,
+            isError = !isNameValid.value,
             keyboardOptions = KeyboardOptions(
                 capitalization = KeyboardCapitalization.Words,
                 keyboardType = KeyboardType.Text,
                 imeAction = ImeAction.Next
             ),
-            onValueChange = { viewModel.onAction(RegistrationScreenAction.UpdateName(it)) },
+            onValueChange = { onAction(RegistrationScreenAction.UpdateName(it)) },
             modifier = Modifier
                 .fillMaxWidth()
                 .padding(PaddingValues(top = 4.dp))
@@ -194,14 +216,14 @@ private fun RegistrationComponent(
                 )
             },
             singleLine = true,
-            isError = isInvalidPassword.value,
+            isError = !isPasswordValid.value,
             visualTransformation = PasswordVisualTransformation(),
             keyboardOptions = KeyboardOptions(
                 capitalization = KeyboardCapitalization.None,
                 keyboardType = KeyboardType.Password,
                 imeAction = ImeAction.Next
             ),
-            onValueChange = { viewModel.onAction(RegistrationScreenAction.UpdatePassword(it)) },
+            onValueChange = { onAction(RegistrationScreenAction.UpdatePassword(it)) },
             modifier = Modifier
                 .fillMaxWidth()
                 .padding(PaddingValues(top = 4.dp))
@@ -219,22 +241,17 @@ private fun RegistrationComponent(
                 )
             },
             singleLine = true,
-            isError = isInvalidConfirmPassword.value,
+            isError = !isConfirmPasswordValid.value,
             visualTransformation = PasswordVisualTransformation(),
             keyboardOptions = KeyboardOptions(
                 capitalization = KeyboardCapitalization.None,
                 keyboardType = KeyboardType.Password,
                 imeAction = ImeAction.Send
             ),
-            onValueChange = { viewModel.onAction(RegistrationScreenAction.UpdateConfirmPassword(it)) },
+            onValueChange = { onAction(RegistrationScreenAction.UpdateConfirmPassword(it)) },
             keyboardActions = KeyboardActions(
                 onSend = {
-                    viewModel.registerNewAccount(
+                    onAction(RegistrationScreenAction.RegisterNewUser)
-                        emailAddress.value,
-                        name.value,
-                        password.value,
-                        confirmPassword.value
-                    )
                 }
             ),
             modifier = Modifier
@@ -266,31 +283,18 @@ private fun RegistrationComponent(
         )
 
         RegisterButton(
-            emailAddress,
+            onAction = onAction
-            name,
-            password,
-            confirmPassword,
-            registerNewAccount = viewModel::registerNewAccount
         )
     }
 }
 
 @Composable
 private fun RegisterButton(
-    emailAddress: State<String>,
+    onAction: (RegistrationScreenAction) -> Unit
-    name: State<String>,
-    password: State<String>,
-    confirmPassword: State<String>,
-    registerNewAccount: (String, String, String, String) -> Unit
 ) {
     Button(
         onClick = {
-            registerNewAccount(
+            onAction(RegistrationScreenAction.RegisterNewUser)
-                emailAddress.value,
-                name.value,
-                password.value,
-                confirmPassword.value
-            )
         },
         modifier = Modifier
             .fillMaxWidth()

app/app/src/main/java/ing/bikeshedengineer/debtpirate/app/screen/auth/presentation/register/RegistrationScreenAction.kt

@@ -6,10 +6,5 @@ sealed interface RegistrationScreenAction {
     data class UpdatePassword(val password: String) : RegistrationScreenAction
     data class UpdateConfirmPassword(val confirmPassword: String) : RegistrationScreenAction
     data object ResetFields : RegistrationScreenAction
-    data class RegisterNewUser(
+    data object RegisterNewUser : RegistrationScreenAction
-        val emailAddress: String,
-        val name: String,
-        val password: String,
-        val confirmPassword: String
-    ) : RegistrationScreenAction
 }

app/app/src/main/java/ing/bikeshedengineer/debtpirate/app/screen/auth/presentation/register/RegistrationScreenState.kt

@@ -0,0 +1,20 @@
+package ing.bikeshedengineer.debtpirate.app.screen.auth.presentation.register
+
+data class RegistrationScreenState(
+    val emailAddress: String,
+    val name: String,
+    val password: String,
+    val confirmPassword: String,
+    val isEmailAddressPristine: Boolean,
+    val isNamePristine: Boolean,
+    val isPasswordPristine: Boolean,
+    val isConfirmPasswordPristine: Boolean,
+    val emailAddressError: String,
+    val nameError: String,
+    val passwordError: String,
+    val confirmPasswordError: String,
+    val isEmailAddressValid: Boolean,
+    val isNameValid: Boolean,
+    val isPasswordValid: Boolean,
+    val isConfirmPasswordValid: Boolean
+)

app/app/src/main/java/ing/bikeshedengineer/debtpirate/app/screen/auth/presentation/register/RegistrationScreenViewModel.kt

@@ -1,6 +1,6 @@
 package ing.bikeshedengineer.debtpirate.app.screen.auth.presentation.register
 
-import androidx.credentials.CreatePasswordRequest
+import android.util.Patterns
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
 import dagger.hilt.android.lifecycle.HiltViewModel
@@ -13,8 +13,11 @@ import ing.bikeshedengineer.debtpirate.navigation.Navigator
 import kotlinx.coroutines.flow.MutableSharedFlow
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.asSharedFlow
-import kotlinx.coroutines.flow.asStateFlow
+import kotlinx.coroutines.flow.distinctUntilChangedBy
+import kotlinx.coroutines.flow.launchIn
 import kotlinx.coroutines.flow.map
+import kotlinx.coroutines.flow.onEach
+import kotlinx.coroutines.flow.update
 import kotlinx.coroutines.launch
 import javax.inject.Inject
 
@@ -25,6 +28,144 @@ class RegistrationScreenViewModel @Inject constructor(
     private val submitAccountRegistrationRequest: SubmitAccountRegistrationRequestUseCase,
     private val updateStoreData: UpdateStoreDataUseCase,
 ) : ViewModel() {
+    private val _state = MutableStateFlow(
+        RegistrationScreenState(
+            emailAddress = "",
+            name = "",
+            password = "",
+            confirmPassword = "",
+            isEmailAddressPristine = true,
+            isNamePristine = true,
+            isPasswordPristine = true,
+            isConfirmPasswordPristine = true,
+            emailAddressError = "",
+            nameError = "",
+            passwordError = "",
+            confirmPasswordError = "",
+            isEmailAddressValid = false,
+            isNameValid = false,
+            isPasswordValid = false,
+            isConfirmPasswordValid = false
+        )
+    )
+
+    val emailAddress = _state.map { it.emailAddress }
+    val name = _state.map { it.name }
+    val password = _state.map { it.password }
+    val confirmPassword = _state.map { it.confirmPassword }
+
+    val isEmailAddressPristine = _state.map { it.isEmailAddressPristine }
+    val isNamePristine = _state.map { it.isNamePristine }
+    val isPasswordPristine = _state.map { it.isPasswordPristine }
+    val isConfirmPasswordPristine = _state.map { it.isConfirmPasswordPristine }
+
+    val emailAddressError = _state.map { it.emailAddressError }
+    val nameError = _state.map { it.nameError }
+    val passwordError = _state.map { it.passwordError }
+    val confirmPasswordError = _state.map { it.confirmPasswordError }
+
+    val isEmailAddressValid = _state.map { it.isEmailAddressValid }
+    val isNameValid = _state.map { it.isNameValid }
+    val isPasswordValid = _state.map { it.isPasswordValid }
+    val isConfirmPasswordValid = _state.map { it.isConfirmPasswordValid }
+
+    private val _onRegistrationComplete = MutableSharedFlow<Pair<String, String>?>()
+    val onRegistrationComplete = _onRegistrationComplete.asSharedFlow()
+
+    init {
+        _state.distinctUntilChangedBy { it.emailAddress }
+            .map { it.emailAddress.isNotBlank() && Patterns.EMAIL_ADDRESS.matcher(it.emailAddress).matches() }
+            .onEach { isEmailAddressValid ->
+                _state.update {
+                    it.copy(
+                        isEmailAddressPristine = false,
+                        isEmailAddressValid = it.isEmailAddressPristine || isEmailAddressValid
+                    )
+                }
+            }
+            .launchIn(viewModelScope)
+
+        _state.distinctUntilChangedBy { it.name }
+            .map { it.name.isNotBlank() }
+            .onEach { isNameValid ->
+                _state.update {
+                    it.copy(
+                        isNamePristine = false,
+                        isNameValid = it.isNamePristine || isNameValid
+                    )
+                }
+            }
+            .launchIn(viewModelScope)
+
+        _state.distinctUntilChangedBy { it.password }
+            .map { it.password.isNotBlank() }
+            .onEach { isPasswordValid ->
+                _state.update {
+                    it.copy(
+                        isPasswordPristine = false,
+                        isPasswordValid = it.isPasswordPristine || isPasswordValid
+                    )
+                }
+            }
+            .launchIn(viewModelScope)
+
+        _state.distinctUntilChangedBy { it.confirmPassword }
+            .map { it.confirmPassword.isNotBlank() }
+            .onEach { isConfirmPasswordValid ->
+                _state.update {
+                    it.copy(
+                        isConfirmPasswordPristine = false,
+                        isConfirmPasswordValid = it.isConfirmPasswordPristine || isConfirmPasswordValid
+                    )
+                }
+            }
+            .launchIn(viewModelScope)
+    }
+
+    fun onAction(action: RegistrationScreenAction) {
+        when (action) {
+            is RegistrationScreenAction.UpdateEmailAddress -> {
+                _state.update { it.copy(emailAddress = action.emailAddress) }
+            }
+
+            is RegistrationScreenAction.UpdateName -> {
+                _state.update { it.copy(name = action.name) }
+            }
+
+            is RegistrationScreenAction.UpdatePassword -> {
+                _state.update { it.copy(password = action.password) }
+            }
+
+            is RegistrationScreenAction.UpdateConfirmPassword -> {
+                _state.update { it.copy(confirmPassword = action.confirmPassword) }
+            }
+
+            is RegistrationScreenAction.ResetFields -> {
+                _state.update {
+                    it.copy(
+                        emailAddress = "",
+                        isEmailAddressPristine = true,
+                        name = "",
+                        isNamePristine = true,
+                        password = "",
+                        isPasswordPristine = true,
+                        confirmPassword = "",
+                        isConfirmPasswordPristine = true
+                    )
+                }
+            }
+
+            is RegistrationScreenAction.RegisterNewUser -> {
+                registerNewAccount(
+                    _state.value.emailAddress,
+                    _state.value.name,
+                    _state.value.password,
+                    _state.value.confirmPassword
+                )
+            }
+        }
+    }
+
     fun navigateUp() {
         viewModelScope.launch {
             navigator.navigateUp()
@@ -37,70 +178,6 @@ class RegistrationScreenViewModel @Inject constructor(
         }
     }
 
-    private val _emailAddress = MutableStateFlow("")
-    val emailAddress = _emailAddress.asStateFlow()
-
-    private val _emailAddressError = MutableStateFlow("")
-    val emailAddressError = _emailAddressError.asStateFlow()
-    val isInvalidEmailAddress = _emailAddressError.asStateFlow().map { it.isNotEmpty() }
-
-    private val _name = MutableStateFlow("")
-    val name = _name.asStateFlow()
-
-    private val _nameError = MutableStateFlow("")
-    val nameError = _nameError.asStateFlow()
-    val isInvalidName = _nameError.asStateFlow().map { it.isNotEmpty() }
-
-    private val _password = MutableStateFlow("")
-    val password = _password.asStateFlow()
-
-    private val _passwordError = MutableStateFlow("")
-    val passwordError = _passwordError.asStateFlow()
-    val isInvalidPassword = _passwordError.asStateFlow().map { it.isNotEmpty() }
-
-    private val _confirmPassword = MutableStateFlow("")
-    val confirmPassword = _confirmPassword.asStateFlow()
-
-    private val _confirmPasswordError = MutableStateFlow("")
-    val confirmPasswordError = _confirmPasswordError.asStateFlow()
-    val isInvalidConfirmPassword = _confirmPasswordError.asStateFlow().map { it.isNotEmpty() }
-
-    private val _onRegistrationComplete = MutableSharedFlow<Pair<String, String>>()
-    val onRegistrationComplete = _onRegistrationComplete.asSharedFlow()
-
-    fun onAction(action: RegistrationScreenAction) {
-        when (action) {
-            is RegistrationScreenAction.UpdateEmailAddress -> {
-                _emailAddress.value = action.emailAddress
-            }
-
-            is RegistrationScreenAction.UpdateName -> {
-                _name.value = action.name
-            }
-
-            is RegistrationScreenAction.UpdatePassword -> {
-                _password.value = action.password
-            }
-
-            is RegistrationScreenAction.UpdateConfirmPassword -> {
-                _confirmPassword.value = action.confirmPassword
-            }
-
-            is RegistrationScreenAction.ResetFields -> {
-                resetFields()
-            }
-
-            is RegistrationScreenAction.RegisterNewUser -> {
-                registerNewAccount(
-                    action.emailAddress,
-                    action.name,
-                    action.password,
-                    action.confirmPassword
-                )
-            }
-        }
-    }
-
     fun registerNewAccount(
         emailAddress: String,
         name: String,
@@ -140,37 +217,43 @@ class RegistrationScreenViewModel @Inject constructor(
         val validationResults = validateNewAccount(emailAddress, name, password, confirmPassword)
         validationResults.forEach {
             if (it == NewAccountRegistrationValidationResult.EmptyEmailAddressField) {
-                _emailAddressError.value = "Enter an email address"
+                _state.update {
+                    it.copy(emailAddressError = "Enter an email address")
+                }
             } else if (it == NewAccountRegistrationValidationResult.InvalidEmailAddress) {
-                _emailAddressError.value = "Enter a valid email address"
+                _state.update {
+                    it.copy(emailAddressError = "Enter a valid email address")
+                }
             } else if (it == NewAccountRegistrationValidationResult.ValidEmailAddress) {
-                _emailAddressError.value = ""
+                _state.update {
+                    it.copy(emailAddressError = "")
+                }
             }
 
             if (it == NewAccountRegistrationValidationResult.EmptyNameField) {
-                _nameError.value = "Enter your name"
+                _state.update { it.copy(nameError = "Enter your name") }
             } else if (it == NewAccountRegistrationValidationResult.ValidName) {
-                _nameError.value = ""
+                _state.update { it.copy(nameError = "") }
             }
 
             if (it == NewAccountRegistrationValidationResult.EmptyPasswordField) {
-                _passwordError.value = "Enter a password"
+                _state.update { it.copy(passwordError = "Enter a password") }
             } else if (it == NewAccountRegistrationValidationResult.PasswordTooShort) {
-                _passwordError.value = "Password must be more than 8 characters"
+                _state.update { it.copy(passwordError = "Password must be more than 8 characters long") }
             } else if (it == NewAccountRegistrationValidationResult.ValidPassword) {
-                _passwordError.value = ""
+                _state.update { it.copy(passwordError = "") }
             }
 
             if (it == NewAccountRegistrationValidationResult.EmptyConfirmPasswordField) {
-                _confirmPasswordError.value = "Enter a password"
+                _state.update { it.copy(confirmPasswordError = "Enter a password") }
             } else if (it == NewAccountRegistrationValidationResult.PasswordsDontMatch) {
-                _confirmPasswordError.value = "Passwords don't match"
+                _state.update { it.copy(confirmPasswordError = "Passwords don't match") }
             } else if (it == NewAccountRegistrationValidationResult.ValidConfirmPassword) {
-                _confirmPasswordError.value = ""
+                _state.update { it.copy(confirmPasswordError = "") }
             }
         }
 
-        return validationResults.filter {
+        return validationResults.none {
             when (it) {
                 NewAccountRegistrationValidationResult.ValidEmailAddress,
                 NewAccountRegistrationValidationResult.ValidName,
@@ -180,13 +263,6 @@ class RegistrationScreenViewModel @Inject constructor(
 
                 else -> true
             }
-        }.isEmpty()
+        }
-    }
-
-    private fun resetFields() {
-        _emailAddress.value = ""
-        _name.value = ""
-        _password.value = ""
-        _confirmPassword.value = ""
     }
 }