Merge pull request #49 from SELab1/firebaseIntegration

Firebase integration

app/src/main/AndroidManifest.xml

@@ -3,6 +3,7 @@
     xmlns:tools="http://schemas.android.com/tools">
 
     <application
+        android:name=".StudeezHiltApp"
         android:allowBackup="true"
         android:dataExtractionRules="@xml/data_extraction_rules"
         android:fullBackupContent="@xml/backup_rules"

app/src/main/java/be/ugent/sel/studeez/StudeezApp.kt

@@ -0,0 +1,81 @@
+package be.ugent.sel.studeez
+
+import android.content.res.Resources
+import androidx.compose.foundation.layout.padding
+import androidx.compose.material.*
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.ReadOnlyComposable
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.rememberCoroutineScope
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.platform.LocalConfiguration
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.unit.dp
+import androidx.navigation.NavGraphBuilder
+import androidx.navigation.NavHostController
+import androidx.navigation.compose.NavHost
+import androidx.navigation.compose.composable
+import androidx.navigation.compose.rememberNavController
+import be.ugent.sel.studeez.common.snackbar.SnackbarManager
+import be.ugent.sel.studeez.navigation.StudeezDestinations
+import be.ugent.sel.studeez.screens.splash.SplashScreen
+import be.ugent.sel.studeez.ui.theme.StudeezTheme
+import kotlinx.coroutines.CoroutineScope
+
+@Composable
+fun StudeezApp() {
+    StudeezTheme {
+        Surface(color = MaterialTheme.colors.background) {
+            val appState = rememberAppState()
+
+            Scaffold(
+                snackbarHost = {
+                    SnackbarHost(
+                        hostState = it,
+                        modifier = Modifier.padding(8.dp),
+                        snackbar = { snackbarData ->
+                            Snackbar(snackbarData, contentColor = MaterialTheme.colors.onPrimary)
+                        }
+                    )
+                },
+                scaffoldState = appState.scaffoldState
+            ) { innerPaddingModifier ->
+                NavHost(
+                    navController = appState.navController,
+                    startDestination = StudeezDestinations.SPLASH_SCREEN,
+                    modifier = Modifier.padding(innerPaddingModifier)
+                ) {
+                    studeezGraph(appState)
+                }
+            }
+        }
+    }
+}
+
+@Composable
+fun rememberAppState(
+    scaffoldState: ScaffoldState = rememberScaffoldState(),
+    navController: NavHostController = rememberNavController(),
+    snackbarManager: SnackbarManager = SnackbarManager,
+    resources: Resources = resources(),
+    coroutineScope: CoroutineScope = rememberCoroutineScope()
+) =
+    remember(scaffoldState, navController, snackbarManager, resources, coroutineScope) {
+        StudeezAppstate(scaffoldState, navController, snackbarManager, resources, coroutineScope)
+    }
+
+@Composable
+@ReadOnlyComposable
+fun resources(): Resources {
+    LocalConfiguration.current
+    return LocalContext.current.resources
+}
+
+fun NavGraphBuilder.studeezGraph(appState: StudeezAppstate) {
+
+    composable(StudeezDestinations.SPLASH_SCREEN) {
+        SplashScreen(openAndPopUp = { route, popUp -> appState.navigateAndPopUp(route, popUp) })
+    }
+
+
+}

app/src/main/java/be/ugent/sel/studeez/StudeezAppstate.kt

@@ -0,0 +1,51 @@
+package be.ugent.sel.studeez
+
+import android.content.res.Resources
+import androidx.compose.material.ScaffoldState
+import androidx.compose.runtime.Stable
+import androidx.navigation.NavHostController
+import be.ugent.sel.studeez.common.snackbar.SnackbarManager
+import be.ugent.sel.studeez.common.snackbar.SnackbarMessage.Companion.toMessage
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.flow.filterNotNull
+import kotlinx.coroutines.launch
+
+@Stable
+class StudeezAppstate(
+    val scaffoldState: ScaffoldState,
+    val navController: NavHostController,
+    private val snackbarManager: SnackbarManager,
+    private val resources: Resources,
+    coroutineScope: CoroutineScope
+) {
+    init {
+        coroutineScope.launch {
+            snackbarManager.snackbarMessages.filterNotNull().collect { snackbarMessage ->
+                val text = snackbarMessage.toMessage(resources)
+                scaffoldState.snackbarHostState.showSnackbar(text)
+            }
+        }
+    }
+
+    fun popUp() {
+        navController.popBackStack()
+    }
+
+    fun navigate(route: String) {
+        navController.navigate(route) { launchSingleTop = true }
+    }
+
+    fun navigateAndPopUp(route: String, popUp: String) {
+        navController.navigate(route) {
+            launchSingleTop = true
+            popUpTo(popUp) { inclusive = true }
+        }
+    }
+
+    fun clearAndNavigate(route: String) {
+        navController.navigate(route) {
+            launchSingleTop = true
+            popUpTo(0) { inclusive = true }
+        }
+    }
+}

app/src/main/java/be/ugent/sel/studeez/StudeezHiltApp.kt

@@ -0,0 +1,7 @@
+package be.ugent.sel.studeez
+
+import android.app.Application
+import dagger.hilt.android.HiltAndroidApp
+
+@HiltAndroidApp
+class StudeezHiltApp : Application()

app/src/main/java/be/ugent/sel/studeez/activities/MainActivity.kt

@@ -10,8 +10,11 @@ import androidx.compose.material.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.tooling.preview.Preview
+import be.ugent.sel.studeez.StudeezApp
 import be.ugent.sel.studeez.ui.theme.StudeezTheme
+import dagger.hilt.android.AndroidEntryPoint
 
+@AndroidEntryPoint
 class MainActivity : ComponentActivity() {
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
@@ -22,7 +25,7 @@ class MainActivity : ComponentActivity() {
                     modifier = Modifier.fillMaxSize(),
                     color = MaterialTheme.colors.background
                 ) {
-                    Greeting("Android")
+                    StudeezApp()
                 }
             }
         }

app/src/main/java/be/ugent/sel/studeez/common/composable/ButtonComposable.kt

@@ -0,0 +1,46 @@
+package be.ugent.sel.studeez.common.composable
+
+import androidx.annotation.StringRes
+import androidx.compose.material.*
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.unit.sp
+
+@Composable
+fun BasicTextButton(@StringRes text: Int, modifier: Modifier, action: () -> Unit) {
+    TextButton(onClick = action, modifier = modifier) { Text(text = stringResource(text)) }
+}
+
+@Composable
+fun BasicButton(@StringRes text: Int, modifier: Modifier, action: () -> Unit) {
+    Button(
+        onClick = action,
+        modifier = modifier
+    ) {
+        Text(text = stringResource(text), fontSize = 16.sp)
+    }
+}
+
+@Composable
+fun DialogConfirmButton(@StringRes text: Int, action: () -> Unit) {
+    Button(
+        onClick = action
+    ) {
+        Text(text = stringResource(text))
+    }
+}
+
+@Composable
+fun DialogCancelButton(@StringRes text: Int, action: () -> Unit) {
+    Button(
+        onClick = action,
+        colors =
+        ButtonDefaults.buttonColors(
+            backgroundColor = MaterialTheme.colors.onPrimary,
+            contentColor = MaterialTheme.colors.primary
+        )
+    ) {
+        Text(text = stringResource(text))
+    }
+}

app/src/main/java/be/ugent/sel/studeez/common/composable/TextFieldComposable.kt

@@ -0,0 +1,102 @@
+package be.ugent.sel.studeez.common.composable
+
+import androidx.annotation.StringRes
+import androidx.compose.foundation.text.KeyboardOptions
+import androidx.compose.material.Icon
+import androidx.compose.material.IconButton
+import androidx.compose.material.OutlinedTextField
+import androidx.compose.material.Text
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.Email
+import androidx.compose.material.icons.filled.Lock
+import androidx.compose.runtime.*
+import be.ugent.sel.studeez.R.string as AppText
+import be.ugent.sel.studeez.R.drawable as AppIcon
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.res.painterResource
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.text.input.KeyboardType
+import androidx.compose.ui.text.input.PasswordVisualTransformation
+import androidx.compose.ui.text.input.VisualTransformation
+
+@Composable
+fun BasicField(
+    @StringRes text: Int,
+    value: String,
+    onNewValue: (String) -> Unit,
+    modifier: Modifier = Modifier
+) {
+    OutlinedTextField(
+        singleLine = true,
+        modifier = modifier,
+        value = value,
+        onValueChange = { onNewValue(it) },
+        placeholder = { Text(stringResource(text)) }
+    )
+}
+
+@Composable
+fun EmailField(
+    value: String,
+    onNewValue: (String) -> Unit,
+    modifier: Modifier = Modifier
+) {
+    OutlinedTextField(
+        singleLine = true,
+        modifier = modifier,
+        value = value,
+        onValueChange = { onNewValue(it) },
+        placeholder = { Text(stringResource(AppText.email)) },
+        leadingIcon = { Icon(imageVector = Icons.Default.Email, contentDescription = "Email") }
+    )
+}
+
+@Composable
+fun PasswordField(
+    value: String,
+    onNewValue: (String) -> Unit,
+    modifier: Modifier = Modifier
+) {
+    PasswordField(value, AppText.password, onNewValue, modifier)
+}
+
+@Composable
+fun RepeatPasswordField(
+    value: String,
+    onNewValue: (String) -> Unit,
+    modifier: Modifier = Modifier
+) {
+    PasswordField(value, AppText.repeat_password, onNewValue, modifier)
+}
+
+@Composable
+private fun PasswordField(
+    value: String,
+    @StringRes placeholder: Int,
+    onNewValue: (String) -> Unit,
+    modifier: Modifier = Modifier
+) {
+    var isVisible by remember { mutableStateOf(false) }
+
+    val icon =
+        if (isVisible) painterResource(AppIcon.ic_visibility_on)
+        else painterResource(AppIcon.ic_visibility_off)
+
+    val visualTransformation =
+        if (isVisible) VisualTransformation.None else PasswordVisualTransformation()
+
+    OutlinedTextField(
+        modifier = modifier,
+        value = value,
+        onValueChange = { onNewValue(it) },
+        placeholder = { Text(text = stringResource(placeholder)) },
+        leadingIcon = { Icon(imageVector = Icons.Default.Lock, contentDescription = "Lock") },
+        trailingIcon = {
+            IconButton(onClick = { isVisible = !isVisible }) {
+                Icon(painter = icon, contentDescription = "Visibility")
+            }
+        },
+        keyboardOptions = KeyboardOptions(keyboardType = KeyboardType.Password),
+        visualTransformation = visualTransformation
+    )
+}

app/src/main/java/be/ugent/sel/studeez/common/ext/ModifierExt.kt

@@ -0,0 +1,42 @@
+package be.ugent.sel.studeez.common.ext
+
+import androidx.compose.foundation.layout.*
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.unit.dp
+
+fun Modifier.textButton(): Modifier {
+    return this.fillMaxWidth().padding(16.dp, 8.dp, 16.dp, 0.dp)
+}
+
+fun Modifier.basicButton(): Modifier {
+    return this.fillMaxWidth().padding(16.dp, 8.dp)
+}
+
+fun Modifier.card(): Modifier {
+    return this.padding(16.dp, 0.dp, 16.dp, 8.dp)
+}
+
+fun Modifier.contextMenu(): Modifier {
+    return this.wrapContentWidth()
+}
+
+fun Modifier.dropdownSelector(): Modifier {
+    return this.fillMaxWidth()
+}
+
+fun Modifier.fieldModifier(): Modifier {
+    return this.fillMaxWidth().padding(16.dp, 4.dp)
+}
+
+fun Modifier.toolbarActions(): Modifier {
+    return this.wrapContentSize(Alignment.TopEnd)
+}
+
+fun Modifier.spacer(): Modifier {
+    return this.fillMaxWidth().padding(12.dp)
+}
+
+fun Modifier.smallSpacer(): Modifier {
+    return this.fillMaxWidth().height(8.dp)
+}

app/src/main/java/be/ugent/sel/studeez/common/ext/StringExt.kt

@@ -0,0 +1,25 @@
+package be.ugent.sel.studeez.common.ext
+
+import android.util.Patterns
+import java.util.regex.Pattern
+
+private const val MIN_PASS_LENGTH = 6
+private const val PASS_PATTERN = "^(?=.*\\d)(?=.*[a-z])(?=.*[A-Z])(?=\\S+$).{4,}$"
+
+fun String.isValidEmail(): Boolean {
+    return this.isNotBlank() && Patterns.EMAIL_ADDRESS.matcher(this).matches()
+}
+
+fun String.isValidPassword(): Boolean {
+    return this.isNotBlank() &&
+            this.length >= MIN_PASS_LENGTH &&
+            Pattern.compile(PASS_PATTERN).matcher(this).matches()
+}
+
+fun String.passwordMatches(repeated: String): Boolean {
+    return this == repeated
+}
+
+fun String.idFromParameter(): String {
+    return this.substring(1, this.length - 1)
+}

app/src/main/java/be/ugent/sel/studeez/common/snackbar/SnackBarManager.kt

@@ -0,0 +1,20 @@
+package be.ugent.sel.studeez.common.snackbar
+
+import androidx.annotation.StringRes
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.asStateFlow
+
+object SnackbarManager {
+    private val messages: MutableStateFlow<SnackbarMessage?> = MutableStateFlow(null)
+    val snackbarMessages: StateFlow<SnackbarMessage?>
+        get() = messages.asStateFlow()
+
+    fun showMessage(@StringRes message: Int) {
+        messages.value = SnackbarMessage.ResourceSnackbar(message)
+    }
+
+    fun showMessage(message: SnackbarMessage) {
+        messages.value = message
+    }
+}

app/src/main/java/be/ugent/sel/studeez/common/snackbar/SnackBarMessage.kt

@@ -0,0 +1,25 @@
+package be.ugent.sel.studeez.common.snackbar
+
+import android.content.res.Resources
+import androidx.annotation.StringRes
+import be.ugent.sel.studeez.R.string as AppText
+
+sealed class SnackbarMessage {
+    class StringSnackbar(val message: String) : SnackbarMessage()
+    class ResourceSnackbar(@StringRes val message: Int) : SnackbarMessage()
+
+    companion object {
+        fun SnackbarMessage.toMessage(resources: Resources): String {
+            return when (this) {
+                is StringSnackbar -> this.message
+                is ResourceSnackbar -> resources.getString(this.message)
+            }
+        }
+
+        fun Throwable.toSnackbarMessage(): SnackbarMessage {
+            val message = this.message.orEmpty()
+            return if (message.isNotBlank()) StringSnackbar(message)
+            else ResourceSnackbar(AppText.generic_error)
+        }
+    }
+}

app/src/main/java/be/ugent/sel/studeez/di/DatabaseModule.kt

@@ -0,0 +1,19 @@
+package be.ugent.sel.studeez.di
+
+import be.ugent.sel.studeez.domain.AccountDAO
+import be.ugent.sel.studeez.domain.LogService
+import be.ugent.sel.studeez.domain.implementation.FirebaseAccountDAO
+import be.ugent.sel.studeez.domain.implementation.LogServiceImpl
+import dagger.Binds
+import dagger.Module
+import dagger.hilt.InstallIn
+import dagger.hilt.components.SingletonComponent
+
+@Module
+@InstallIn(SingletonComponent::class)
+abstract class DatabaseModule {
+    @Binds abstract fun provideAccountDAO(impl: FirebaseAccountDAO): AccountDAO
+
+    @Binds abstract fun provideLogService(impl: LogServiceImpl): LogService
+
+}

app/src/main/java/be/ugent/sel/studeez/di/FireBaseModule.kt

@@ -0,0 +1,21 @@
+package be.ugent.sel.studeez.di
+
+import com.google.firebase.auth.FirebaseAuth
+import com.google.firebase.auth.ktx.auth
+import com.google.firebase.firestore.FirebaseFirestore
+import com.google.firebase.firestore.ktx.firestore
+import com.google.firebase.ktx.Firebase
+import dagger.Module
+import dagger.Provides
+import dagger.hilt.InstallIn
+import dagger.hilt.components.SingletonComponent
+
+@Module
+@InstallIn(SingletonComponent::class)
+object FirebaseModule {
+    @Provides
+    fun auth(): FirebaseAuth = Firebase.auth
+
+    @Provides
+    fun firestore(): FirebaseFirestore = Firebase.firestore
+}

app/src/main/java/be/ugent/sel/studeez/domain/AccountDAO.kt

@@ -25,10 +25,9 @@ interface AccountDAO {
 
     val currentUser: Flow<User>
 
-    suspend fun authenticate(email: String, password: String)
+    suspend fun signInWithEmailAndPassword(email: String, password: String)
     suspend fun sendRecoveryEmail(email: String)
-    suspend fun createAnonymousAccount()
-    suspend fun linkAccount(email: String, password: String)
+    suspend fun signUpWithEmailAndPassword(email: String, password: String)
     suspend fun deleteAccount()
     suspend fun signOut()
 }

app/src/main/java/be/ugent/sel/studeez/domain/LogService.kt

@@ -0,0 +1,5 @@
+package be.ugent.sel.studeez.domain
+
+interface LogService {
+    fun logNonFatalCrash(throwable: Throwable)
+}

app/src/main/java/be/ugent/sel/studeez/domain/implementation/FirebaseAccountDAO.kt

@@ -47,7 +47,7 @@ class FirebaseAccountDAO @Inject constructor(
             awaitClose { auth.removeAuthStateListener(listener) }
         }
 
-    override suspend fun authenticate(email: String, password: String) {
+    override suspend fun signInWithEmailAndPassword(email: String, password: String) {
         auth.signInWithEmailAndPassword(email, password).await()
     }
 
@@ -55,14 +55,8 @@ class FirebaseAccountDAO @Inject constructor(
         auth.sendPasswordResetEmail(email).await()
     }
 
-    override suspend fun createAnonymousAccount() {
-        auth.signInAnonymously().await()
-    }
-
-    override suspend fun linkAccount(email: String, password: String): Unit =
-        trace(LINK_ACCOUNT_TRACE) {
-            val credential = EmailAuthProvider.getCredential(email, password)
-            auth.currentUser!!.linkWithCredential(credential).await()
+    override suspend fun signUpWithEmailAndPassword(email: String, password: String) {
+        auth.createUserWithEmailAndPassword(email, password).await()
     }
 
     override suspend fun deleteAccount() {
@@ -70,16 +64,6 @@ class FirebaseAccountDAO @Inject constructor(
     }
 
     override suspend fun signOut() {
-        if (auth.currentUser!!.isAnonymous) {
-            auth.currentUser!!.delete()
-        }
         auth.signOut()
-
-        // Sign the user back in anonymously.
-        createAnonymousAccount()
-    }
-
-    companion object {
-        private const val LINK_ACCOUNT_TRACE = "linkAccount"
     }
 }

app/src/main/java/be/ugent/sel/studeez/domain/implementation/LogServiceImpl.kt

@@ -0,0 +1,14 @@
+package be.ugent.sel.studeez.domain.implementation
+
+import be.ugent.sel.studeez.domain.LogService
+import com.google.firebase.crashlytics.ktx.crashlytics
+import com.google.firebase.ktx.Firebase
+import javax.inject.Inject
+
+class LogServiceImpl @Inject constructor() : LogService {
+    override fun logNonFatalCrash(throwable: Throwable) {
+        Firebase.crashlytics.recordException(throwable)
+    }
+
+
+}

app/src/main/java/be/ugent/sel/studeez/navigation/StudeezDestinations.kt

@@ -0,0 +1,8 @@
+package be.ugent.sel.studeez.navigation
+
+object StudeezDestinations {
+    const val SPLASH_SCREEN = "splash"
+    const val SIGN_UP_SCREEN = "signup"
+    const val LOGIN_SCREEN = "login"
+
+}

app/src/main/java/be/ugent/sel/studeez/screens/StudeezViewModel.kt

@@ -0,0 +1,23 @@
+package be.ugent.sel.studeez.screens
+
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.viewModelScope
+import be.ugent.sel.studeez.common.snackbar.SnackbarManager
+import be.ugent.sel.studeez.common.snackbar.SnackbarMessage.Companion.toSnackbarMessage
+import be.ugent.sel.studeez.domain.LogService
+import kotlinx.coroutines.CoroutineExceptionHandler
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.launch
+
+open class StudeezViewModel(private val logService: LogService) : ViewModel() {
+    fun launchCatching(snackbar: Boolean = true, block: suspend CoroutineScope.() -> Unit) =
+        viewModelScope.launch(
+            CoroutineExceptionHandler { _, throwable ->
+                if (snackbar) {
+                    SnackbarManager.showMessage(throwable.toSnackbarMessage())
+                }
+                logService.logNonFatalCrash(throwable)
+            },
+            block = block
+        )
+}

app/src/main/java/be/ugent/sel/studeez/screens/splash/SplashScreen.kt

@@ -0,0 +1,55 @@
+package be.ugent.sel.studeez.screens.splash
+
+import androidx.compose.foundation.background
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.fillMaxHeight
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.rememberScrollState
+import androidx.compose.foundation.verticalScroll
+import androidx.compose.material.CircularProgressIndicator
+import androidx.compose.material.MaterialTheme
+import androidx.compose.material.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.res.stringResource
+import androidx.hilt.navigation.compose.hiltViewModel
+import be.ugent.sel.studeez.common.composable.BasicButton
+import be.ugent.sel.studeez.common.ext.basicButton
+import kotlinx.coroutines.delay
+import be.ugent.sel.studeez.R.string as AppText
+
+private const val SPLASH_TIMEOUT = 1000L
+
+@Composable
+fun SplashScreen(
+    openAndPopUp: (String, String) -> Unit,
+    modifier: Modifier = Modifier,
+    viewModel: SplashViewModel = hiltViewModel()
+) {
+    Column(
+        modifier =
+        modifier
+            .fillMaxWidth()
+            .fillMaxHeight()
+            .background(color = MaterialTheme.colors.background)
+            .verticalScroll(rememberScrollState()),
+        verticalArrangement = Arrangement.Center,
+        horizontalAlignment = Alignment.CenterHorizontally
+    ) {
+        if (viewModel.showError.value) {
+            Text(text = stringResource(AppText.generic_error))
+
+            BasicButton(AppText.try_again, Modifier.basicButton()) { viewModel.onAppStart(openAndPopUp) }
+        } else {
+            CircularProgressIndicator(color = MaterialTheme.colors.onBackground)
+        }
+    }
+
+    LaunchedEffect(true) {
+        delay(SPLASH_TIMEOUT)
+        viewModel.onAppStart(openAndPopUp)
+    }
+}

app/src/main/java/be/ugent/sel/studeez/screens/splash/SplashViewModel.kt

@@ -0,0 +1,26 @@
+package be.ugent.sel.studeez.screens.splash
+
+import androidx.compose.runtime.mutableStateOf
+import be.ugent.sel.studeez.domain.AccountDAO
+import be.ugent.sel.studeez.domain.LogService
+import be.ugent.sel.studeez.screens.StudeezViewModel
+import dagger.hilt.android.lifecycle.HiltViewModel
+import javax.inject.Inject
+
+@HiltViewModel
+class SplashViewModel @Inject constructor(
+    private val accountDAO: AccountDAO,
+    logService: LogService
+) : StudeezViewModel(logService) {
+    val showError = mutableStateOf(false)
+
+    fun onAppStart(openAndPopUp: (String, String) -> Unit) {
+
+        showError.value = false
+        if (accountDAO.hasUser) {
+            // openAndPopUp( <homeScreen>, SPLASH_SCREEN)
+        } else{
+            // openAndPopUp(<login>, SPLASH_SCREEN)
+        }
+    }
+}

app/src/main/res/drawable/ic_visibility_off.xml

@@ -0,0 +1,10 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24"
+    android:tint="?attr/colorControlNormal">
+  <path
+      android:fillColor="@android:color/white"
+      android:pathData="M12,7c2.76,0 5,2.24 5,5 0,0.65 -0.13,1.26 -0.36,1.83l2.92,2.92c1.51,-1.26 2.7,-2.89 3.43,-4.75 -1.73,-4.39 -6,-7.5 -11,-7.5 -1.4,0 -2.74,0.25 -3.98,0.7l2.16,2.16C10.74,7.13 11.35,7 12,7zM2,4.27l2.28,2.28 0.46,0.46C3.08,8.3 1.78,10.02 1,12c1.73,4.39 6,7.5 11,7.5 1.55,0 3.03,-0.3 4.38,-0.84l0.42,0.42L19.73,22 21,20.73 3.27,3 2,4.27zM7.53,9.8l1.55,1.55c-0.05,0.21 -0.08,0.43 -0.08,0.65 0,1.66 1.34,3 3,3 0.22,0 0.44,-0.03 0.65,-0.08l1.55,1.55c-0.67,0.33 -1.41,0.53 -2.2,0.53 -2.76,0 -5,-2.24 -5,-5 0,-0.79 0.2,-1.53 0.53,-2.2zM11.84,9.02l3.15,3.15 0.02,-0.16c0,-1.66 -1.34,-3 -3,-3l-0.17,0.01z"/>
+</vector>

app/src/main/res/drawable/ic_visibility_on.xml

@@ -0,0 +1,10 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24"
+    android:tint="?attr/colorControlNormal">
+  <path
+      android:fillColor="@android:color/white"
+      android:pathData="M12,4.5C7,4.5 2.73,7.61 1,12c1.73,4.39 6,7.5 11,7.5s9.27,-3.11 11,-7.5c-1.73,-4.39 -6,-7.5 -11,-7.5zM12,17c-2.76,0 -5,-2.24 -5,-5s2.24,-5 5,-5 5,2.24 5,5 -2.24,5 -5,5zM12,9c-1.66,0 -3,1.34 -3,3s1.34,3 3,3 3,-1.34 3,-3 -1.34,-3 -3,-3z"/>
+</vector>

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

@@ -1,3 +1,26 @@
 <resources>
+    <!-- Common -->
     <string name="app_name">Studeez</string>
+    <string name="email">Email</string>
+    <string name="password">Password</string>
+    <string name="repeat_password">Repeat password</string>
+    <string name="generic_error">Something wrong happened. Please try again.</string>
+    <string name="email_error">Please insert a valid email.</string>
+    <string name="cancel">Cancel</string>
+    <string name="try_again">Try again</string>
+
+    <!-- SignUpScreen -->
+    <string name="create_account">Create account</string>
+    <string name="password_error">Your password should have at least six characters and include one digit, one lower case letter and one upper case letter.</string>
+    <string name="password_match_error">Passwords do not match.</string>
+    <string name="already_user">Already have an account? Log in.</string>
+
+    <!-- LoginScreen -->
+    <string name="not_already_user">Don\'t have an account yet? Sign up.</string>
+    <string name="sign_in">Sign in</string>
+    <string name="login_details">Enter your login details</string>
+    <string name="forgot_password">Forgot password? Click to get recovery email</string>
+    <string name="recovery_email_sent">Check your inbox for the recovery email.</string>
+    <string name="empty_password_error">Password cannot be empty.</string>
+
 </resources>