Валидация регистрации

app/src/main/java/com/example/shawarma/screens/registration/RegistrationScreen.kt

@@ -9,10 +9,12 @@ import androidx.compose.foundation.layout.size
 import androidx.compose.foundation.rememberScrollState
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.foundation.verticalScroll
+import androidx.compose.material.AlertDialog
 import androidx.compose.material.Button
 import androidx.compose.material.ButtonDefaults
 import androidx.compose.material.Card
 import androidx.compose.material.Text
+import androidx.compose.material.TextButton
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.livedata.observeAsState
 import androidx.compose.runtime.mutableStateOf
@@ -21,6 +23,7 @@ import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.text.TextStyle
+import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.text.input.TextFieldValue
 import androidx.compose.ui.text.style.TextDecoration
 import androidx.compose.ui.unit.dp
@@ -30,6 +33,7 @@ import androidx.hilt.navigation.compose.hiltViewModel
 import androidx.navigation.NavHostController
 import com.example.shawarma.ui.theme.JejuFamily
 import com.example.shawarma.ui.theme.MyLightRed
+import com.example.shawarma.ui.theme.NunitoFamily
 import com.example.shawarma.utils.ScreenPaths
 import com.example.shawarma.viewmodels.UserViewModel
 import com.example.shawarma.widgets.MyTextField
@@ -49,6 +53,8 @@ fun RegistrationCard(navHostController: NavHostController){
     val password = remember { mutableStateOf(TextFieldValue("")) }
     val passwordRepeat = remember { mutableStateOf(TextFieldValue("")) }
 
+    val showError = remember { mutableStateOf(false) }
+
     val userViewModel: UserViewModel = hiltViewModel<UserViewModel>()
 
     if (userViewModel.registrationState.observeAsState().value == true) {
@@ -58,18 +64,56 @@ fun RegistrationCard(navHostController: NavHostController){
             }
         }
     }
+    showError.value = userViewModel.registrationState.observeAsState().value == false
+
+    if (showError.value) {
+        AlertDialog(
+            title = {
+                Text(
+                    text = "Ошибка регистрации",
+                    fontFamily = NunitoFamily,
+                    fontWeight = FontWeight.Bold,
+                    fontSize = 20.sp
+                )
+            },
+            text = {
+                Text(
+                    text = "Проверьте корректность введенных данных",
+                    fontFamily = NunitoFamily,
+                    fontWeight = FontWeight.Normal,
+                    fontSize = 16.sp
+                )
+            },
+            onDismissRequest = {
+               userViewModel.calmRegisterState()
+            },
+            buttons = {
+                    TextButton(
+                        onClick = {
+                            userViewModel.calmRegisterState()
+                        }
+                    ) {
+                        Text("ОК")
+                    }
+
+            }
+        )
+    }
 
     Column(
         horizontalAlignment = Alignment.CenterHorizontally,
         modifier = Modifier
             .zIndex(2f)
             .verticalScroll(rememberScrollState())
-            .imePadding().padding(10.dp)
+            .imePadding()
+            .padding(10.dp)
             .fillMaxHeight()
     ) {
         Card(
             shape = RoundedCornerShape(20.dp),
-            modifier = Modifier.size(275.dp, 380.dp + 72.dp).padding(top = 72.dp)
+            modifier = Modifier
+                .size(275.dp, 380.dp + 72.dp)
+                .padding(top = 72.dp)
         ) {
             Column(
                 horizontalAlignment = Alignment.CenterHorizontally

app/src/main/java/com/example/shawarma/viewmodels/UserViewModel.kt

@@ -40,9 +40,18 @@ class UserViewModel @Inject constructor(
         get() = _registrationState
 
     fun register(login: String, password: String, passwordRepeat: String) {
+        _registrationState.postValue(null)
         if (password != passwordRepeat) {
-            // ругаться в ui
             _registrationState.postValue(false)
+            return
+        }
+        if (login.length < 8 || login.length > 20) {
+            _registrationState.postValue(false)
+            return
+        }
+        if (password.length < 8 || password.length > 20) {
+            _registrationState.postValue(false)
+            return
         }
         viewModelScope.launch {
             withContext(Dispatchers.Main) {
@@ -56,11 +65,17 @@ class UserViewModel @Inject constructor(
                             userRepository.insert(UserModel(null, login, password, "USER"))
                             _registrationState.postValue(true)
                         }
+                    }
+                    else {
+                        _registrationState.postValue(false)
+                    }
+                }
+            }
+        }
+    }
 
-                    }
+    fun calmRegisterState() {
-                }
+        _registrationState.postValue(null)
-            }
-        }
     }
 
 }