added login viewmodel

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

@@ -0,0 +1,69 @@
+package be.ugent.sel.studeez.screens.sign_in
+
+import androidx.compose.runtime.mutableStateOf
+import be.ugent.sel.studeez.common.ext.isValidEmail
+import be.ugent.sel.studeez.common.snackbar.SnackbarManager
+import be.ugent.sel.studeez.domain.AccountDAO
+import be.ugent.sel.studeez.domain.LogService
+import be.ugent.sel.studeez.navigation.StudeezDestinations
+import be.ugent.sel.studeez.navigation.StudeezDestinations.LOGIN_SCREEN
+import be.ugent.sel.studeez.navigation.StudeezDestinations.SIGN_UP_SCREEN
+import be.ugent.sel.studeez.screens.StudeezViewModel
+import dagger.hilt.android.lifecycle.HiltViewModel
+import javax.inject.Inject
+import be.ugent.sel.studeez.R.string as AppText
+
+@HiltViewModel
+class LoginViewModel @Inject constructor(
+    private val accountDAO: AccountDAO,
+    logService: LogService
+) : StudeezViewModel(logService) {
+    var uiState = mutableStateOf(LoginUiState())
+        private set
+
+    private val email
+        get() = uiState.value.email
+    private val password
+        get() = uiState.value.password
+
+    fun onEmailChange(newValue: String) {
+        uiState.value = uiState.value.copy(email = newValue)
+    }
+
+    fun onPasswordChange(newValue: String) {
+        uiState.value = uiState.value.copy(password = newValue)
+    }
+
+    fun onSignInClick(openAndPopUp: (String, String) -> Unit) {
+        if (!email.isValidEmail()) {
+            SnackbarManager.showMessage(AppText.email_error)
+            return
+        }
+
+        if (password.isBlank()) {
+            SnackbarManager.showMessage(AppText.empty_password_error)
+            return
+        }
+
+        launchCatching {
+            accountDAO.signInWithEmailAndPassword(email, password)
+            openAndPopUp(SIGN_UP_SCREEN, LOGIN_SCREEN) // Is not reached when error occurs.
+        }
+    }
+
+    fun onForgotPasswordClick() {
+        if (!email.isValidEmail()) {
+            SnackbarManager.showMessage(AppText.email_error)
+            return
+        }
+
+        launchCatching {
+            accountDAO.sendRecoveryEmail(email)
+            SnackbarManager.showMessage(AppText.recovery_email_sent)
+        }
+    }
+
+    fun onNotAlreadyUser(openAndPopUp: (String, String) -> Unit) {
+        openAndPopUp(SIGN_UP_SCREEN, LOGIN_SCREEN)
+    }
+}