4 lab

.idea/inspectionProfiles/Project_Default.xml

@@ -37,5 +37,6 @@
       <option name="composableFile" value="true" />
       <option name="previewFile" value="true" />
     </inspection_tool>
+    <inspection_tool class="UnusedEquals" enabled="false" level="WARNING" enabled_by_default="false" />
   </profile>
 </component>

app/build.gradle.kts

@@ -73,4 +73,9 @@ dependencies {
     androidTestImplementation("androidx.compose.ui:ui-test-junit4")
     debugImplementation("androidx.compose.ui:ui-tooling")
     debugImplementation("androidx.compose.ui:ui-test-manifest")
+
+    // Paging
+    val paging_version = "3.2.0-rc01"
+    implementation("androidx.paging:paging-runtime:$paging_version")
+    implementation("androidx.paging:paging-compose:$paging_version")
 }

app/src/main/AndroidManifest.xml

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

app/src/main/java/com/example/myapplication/MainActivity.kt

@@ -1,5 +1,6 @@
 package com.example.myapplication
 
+import android.content.Context
 import android.content.res.Configuration
 import android.os.Bundle
 import androidx.activity.ComponentActivity
@@ -16,6 +17,7 @@ import com.example.myapplication.ui.theme.MyApplicationTheme
 class MainActivity : ComponentActivity() {
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
+        MainActivity.appContext = applicationContext
         setContent {
             MyApplicationTheme {
                 Surface(
@@ -27,6 +29,11 @@ class MainActivity : ComponentActivity() {
             }
         }
     }
+    companion object {
+
+        lateinit  var appContext: Context
+
+    }
 }
 
 @Preview(name = "Light Mode", showBackground = true, uiMode = Configuration.UI_MODE_NIGHT_NO)

app/src/main/java/com/example/myapplication/MyApplication.kt

@@ -0,0 +1,14 @@
+package com.example.myapplication
+
+import android.app.Application
+import com.example.myapplication.db.database.AppContainer
+import com.example.myapplication.db.database.AppDataContainer
+
+class MyApplication : Application() {
+    lateinit var container: AppContainer
+
+    override fun onCreate() {
+        super.onCreate()
+        container = AppDataContainer(this)
+    }
+}

app/src/main/java/com/example/myapplication/SingletonClass.kt

@@ -0,0 +1,14 @@
+package com.example.myapplication
+
+class SingletonClass{
+    var _userId = 2
+    var _role = "USER"
+    fun getUserId(): Int{ return _userId }
+    fun setUserId(userId: Int){
+        _userId = userId
+    }
+    fun getRole(): String{ return _role }
+    fun setRole(role: String){
+        _role = role
+    }
+}

app/src/main/java/com/example/myapplication/composeui/AppViewModelProvider.kt

@@ -0,0 +1,76 @@
+package com.example.myapplication.composeui
+
+import androidx.lifecycle.ViewModelProvider
+import androidx.lifecycle.createSavedStateHandle
+import androidx.lifecycle.viewmodel.CreationExtras
+import androidx.lifecycle.viewmodel.initializer
+import androidx.lifecycle.viewmodel.viewModelFactory
+import com.example.myapplication.MyApplication
+import com.example.myapplication.composeui.ViewModel.AuthorDropDownViewModel
+import com.example.myapplication.composeui.ViewModel.AuthorEditViewModel
+import com.example.myapplication.composeui.ViewModel.AuthorListViewModel
+import com.example.myapplication.composeui.ViewModel.BookEditViewModel
+import com.example.myapplication.composeui.ViewModel.BookListViewModel
+import com.example.myapplication.composeui.ViewModel.BookPageViewModel
+import com.example.myapplication.composeui.ViewModel.SearchPageViewModel
+import com.example.myapplication.composeui.ViewModel.UserEditViewModel
+import com.example.myapplication.composeui.ViewModel.UserPageViewModel
+
+object AppViewModelProvider {
+    val Factory = viewModelFactory {
+        initializer {
+            UserPageViewModel(
+                this.createSavedStateHandle(),
+                myApplication().container.userRepository
+            )
+        }
+        initializer {
+            UserEditViewModel(
+                this.createSavedStateHandle(),
+                myApplication().container.userRepository
+            )
+        }
+        initializer {
+            SearchPageViewModel(
+                myApplication().container.bookRepository,
+                this.createSavedStateHandle()
+            )
+        }
+        initializer {
+            BookPageViewModel(
+                myApplication().container.bookRepository,
+                this.createSavedStateHandle()
+            )
+        }
+        initializer {
+            BookListViewModel(
+                myApplication().container.bookRepository
+            )
+        }
+        initializer {
+            BookEditViewModel(
+                this.createSavedStateHandle(),
+                myApplication().container.bookRepository
+            )
+        }
+        initializer {
+            AuthorListViewModel(
+                myApplication().container.authorRepository
+            )
+        }
+        initializer {
+            AuthorEditViewModel(
+                this.createSavedStateHandle(),
+                myApplication().container.authorRepository
+            )
+        }
+        initializer {
+            AuthorDropDownViewModel(
+                myApplication().container.authorRepository
+            )
+        }
+    }
+}
+
+fun CreationExtras.myApplication(): MyApplication =
+    (this[ViewModelProvider.AndroidViewModelFactory.APPLICATION_KEY] as MyApplication)

app/src/main/java/com/example/myapplication/composeui/AuthorCell.kt

@@ -0,0 +1,97 @@
+package com.example.myapplication.composeui
+
+import android.util.Log
+import android.widget.Toast
+import androidx.compose.foundation.Image
+import androidx.compose.foundation.border
+import androidx.compose.foundation.clickable
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.PaddingValues
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.requiredSize
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.Create
+import androidx.compose.material.icons.filled.Delete
+import androidx.compose.material3.Button
+import androidx.compose.material3.ButtonDefaults
+import androidx.compose.material3.Icon
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.rememberCoroutineScope
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.clip
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.graphics.asImageBitmap
+import androidx.compose.ui.layout.ContentScale
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.unit.dp
+import androidx.lifecycle.viewmodel.compose.viewModel
+import androidx.navigation.NavController
+import com.example.myapplication.MainActivity
+import com.example.myapplication.composeui.ViewModel.AuthorListViewModel
+import com.example.myapplication.composeui.navigation.Screen
+import com.example.myapplication.db.database.AppDatabase
+import com.example.myapplication.db.model.Author
+import kotlinx.coroutines.flow.first
+import kotlinx.coroutines.flow.firstOrNull
+import kotlinx.coroutines.launch
+import java.lang.Exception
+
+@Composable
+fun AuthorCell(navController: NavController?, author: Author, viewModel: AuthorListViewModel = viewModel(factory = AppViewModelProvider.Factory)){
+    val scope = rememberCoroutineScope()
+    val context = LocalContext.current
+    Column(modifier = Modifier
+        .padding(all = 5.dp)
+        .requiredSize(170.dp, 100.dp)
+        .clip(RoundedCornerShape(10.dp))
+        .border(1.dp, Color.LightGray, shape = RoundedCornerShape(10.dp))
+    ) {
+        Text("${author.name}")
+        Row{
+            Button(
+                modifier = Modifier
+                    .padding(all = 5.dp),
+                onClick = {
+                    val route = Screen.AuthorEdit.route.replace("{id}", author.uid.toString())
+                    navController!!.navigate(route)
+                },
+            ) {
+                Icon(
+                    imageVector = Icons.Default.Create,
+                    contentDescription = "Изменить",
+                    tint = Color.White
+                )
+            }
+            Button(
+                modifier = Modifier
+                    .padding(all = 5.dp),
+                onClick = {
+                    scope.launch {
+                        if (AppDatabase.getInstance(context).bookDao().getByAuthorId(author.uid).firstOrNull().toString() == "[]") {
+                            viewModel.deleteAuthor(author)
+                        } else {
+                            val toast = Toast.makeText(
+                                MainActivity.appContext,
+                                "Невозможно удалить, есть книги данного автора",
+                                Toast.LENGTH_SHORT
+                            )
+                            toast.show()
+                        }
+                    }
+                },
+                colors = ButtonDefaults.buttonColors(containerColor = Color.Red),
+            ) {
+                Icon(
+                    imageVector = Icons.Default.Delete,
+                    contentDescription = "Удалить",
+                    tint = Color.White
+                )
+            }
+        }
+
+    }
+}

app/src/main/java/com/example/myapplication/composeui/AuthorEdit.kt

@@ -0,0 +1,90 @@
+package com.example.myapplication.composeui
+
+import android.graphics.Bitmap
+import androidx.compose.foundation.ScrollState
+import androidx.compose.foundation.background
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.text.KeyboardOptions
+import androidx.compose.foundation.verticalScroll
+import androidx.compose.material3.Button
+import androidx.compose.material3.DropdownMenu
+import androidx.compose.material3.DropdownMenuItem
+import androidx.compose.material3.ExperimentalMaterial3Api
+import androidx.compose.material3.ExposedDropdownMenuBox
+import androidx.compose.material3.ExposedDropdownMenuDefaults
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.OutlinedTextField
+import androidx.compose.material3.Text
+import androidx.compose.material3.TextField
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.rememberCoroutineScope
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.unit.dp
+import androidx.lifecycle.viewmodel.compose.viewModel
+import androidx.navigation.NavController
+import com.example.myapplication.R
+import com.example.myapplication.SingletonClass
+import com.example.myapplication.composeui.ViewModel.AuthorsListUiState
+import com.example.myapplication.composeui.ViewModel.AuthorsUiState
+import com.example.myapplication.composeui.ViewModel.AuthorDetails
+import com.example.myapplication.composeui.ViewModel.AuthorEditViewModel
+import com.example.myapplication.composeui.ViewModel.AuthorUiState
+import com.example.myapplication.composeui.ViewModel.ImageUploader
+import com.example.myapplication.db.model.Author
+import kotlinx.coroutines.launch
+
+@Composable
+fun AuthorEdit(navController: NavController, viewModel: AuthorEditViewModel = viewModel(factory = AppViewModelProvider.Factory)){
+    val coroutineScope = rememberCoroutineScope()
+    AuthorEdit(
+        authorUiState = viewModel.authorUiState,
+        onClick = {
+            coroutineScope.launch {
+                viewModel.saveAuthor()
+                navController.popBackStack()
+            }
+        },
+        onUpdate = viewModel::updateUiState,
+    )
+}
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+private fun AuthorEdit(
+    authorUiState: AuthorUiState,
+    onClick: () -> Unit,
+    onUpdate: (AuthorDetails) -> Unit,
+) {
+    Column(
+        Modifier
+            .fillMaxWidth()
+            .padding(all = 10.dp)
+            .verticalScroll(ScrollState(1))
+    ) {
+        Spacer(modifier = Modifier.size(10.dp))
+        OutlinedTextField(
+            modifier = Modifier.fillMaxWidth(),
+            value = authorUiState.authorDetails.name,
+            onValueChange = { onUpdate(authorUiState.authorDetails.copy(name = it)) },
+            label = { Text("Имя автора") },
+            singleLine = true
+        )
+        Button(
+            onClick = onClick,
+            enabled = authorUiState.isEntryValid,
+            modifier = Modifier.fillMaxWidth()
+        ) {
+            Text(text = "Сохранить")
+        }
+
+    }
+}

app/src/main/java/com/example/myapplication/composeui/BookCell.kt

@@ -0,0 +1,112 @@
+package com.example.myapplication.composeui
+
+import androidx.compose.foundation.Image
+import androidx.compose.foundation.border
+import androidx.compose.foundation.clickable
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.PaddingValues
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.requiredSize
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.Create
+import androidx.compose.material.icons.filled.Delete
+import androidx.compose.material3.Button
+import androidx.compose.material3.ButtonDefaults
+import androidx.compose.material3.Icon
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.rememberCoroutineScope
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.clip
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.graphics.asImageBitmap
+import androidx.compose.ui.layout.ContentScale
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.unit.sp
+import androidx.lifecycle.viewmodel.compose.viewModel
+import androidx.navigation.NavController
+import com.example.myapplication.composeui.ViewModel.BookListViewModel
+import com.example.myapplication.composeui.navigation.Screen
+import com.example.myapplication.db.model.Book
+import kotlinx.coroutines.launch
+
+@Composable
+fun BookCell(navController: NavController?, book: Book, viewModel: BookListViewModel = viewModel(factory = AppViewModelProvider.Factory)){
+    val scope = rememberCoroutineScope()
+    Column(modifier = Modifier
+        .padding(all = 5.dp)
+        .requiredSize(170.dp, 300.dp)
+        .clip(RoundedCornerShape(10.dp))
+        .border(1.dp, Color.LightGray, shape = RoundedCornerShape(10.dp))
+        .clickable(onClick = {
+            navController?.navigate(
+                Screen.BookView.route.replace(
+                    "{id}",
+                    book.uid.toString()
+                )
+            )
+        })
+    ) {
+        Button(modifier = Modifier
+            .fillMaxWidth(),
+            shape = RoundedCornerShape(0.dp),
+            contentPadding = PaddingValues(0.dp),
+            onClick = {
+                navController?.navigate(
+                    Screen.BookView.route.replace(
+                        "{id}",
+                        book.uid.toString()
+                    )
+                )
+            }) {
+            Image(
+                bitmap = book.cover!!.asImageBitmap(),
+                contentDescription = book.title,
+                contentScale = ContentScale.Crop,
+                modifier = Modifier
+                    .requiredSize(170.dp)
+                    .clip(RoundedCornerShape(0.dp))
+            )
+        }
+        Column(modifier = Modifier.padding(all=5.dp)) {
+            Text("${book.title}")
+            Row{
+                Button(
+                    modifier = Modifier
+                        .padding(all = 5.dp),
+                    onClick = {
+                        val route = Screen.BookEdit.route.replace("{id}", book.uid.toString())
+                        navController!!.navigate(route)
+                    },
+                ) {
+                    Icon(
+                        imageVector = Icons.Default.Create,
+                        contentDescription = "Изменить",
+                        tint = Color.White
+                    )
+                }
+                Button(
+                    modifier = Modifier
+                        .padding(all = 5.dp),
+                    onClick = {
+                        scope.launch {
+                            viewModel.deleteBook(book)
+                        }
+                    },
+                    colors = ButtonDefaults.buttonColors(containerColor = Color.Red),
+                ) {
+                    Icon(
+                        imageVector = Icons.Default.Delete,
+                        contentDescription = "Удалить",
+                        tint = Color.White
+                    )
+                }
+            }
+        }
+
+    }
+}

app/src/main/java/com/example/myapplication/composeui/BookEdit.kt

@@ -0,0 +1,173 @@
+package com.example.myapplication.composeui
+
+import android.graphics.Bitmap
+import androidx.compose.foundation.ScrollState
+import androidx.compose.foundation.background
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.text.KeyboardOptions
+import androidx.compose.foundation.verticalScroll
+import androidx.compose.material3.Button
+import androidx.compose.material3.DropdownMenu
+import androidx.compose.material3.DropdownMenuItem
+import androidx.compose.material3.ExperimentalMaterial3Api
+import androidx.compose.material3.ExposedDropdownMenuBox
+import androidx.compose.material3.ExposedDropdownMenuDefaults
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.OutlinedTextField
+import androidx.compose.material3.Text
+import androidx.compose.material3.TextField
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.rememberCoroutineScope
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.unit.dp
+import androidx.lifecycle.viewmodel.compose.viewModel
+import androidx.navigation.NavController
+import com.example.myapplication.R
+import com.example.myapplication.SingletonClass
+import com.example.myapplication.composeui.ViewModel.AuthorDropDownViewModel
+import com.example.myapplication.composeui.ViewModel.AuthorsListUiState
+import com.example.myapplication.composeui.ViewModel.AuthorsUiState
+import com.example.myapplication.composeui.ViewModel.BookDetails
+import com.example.myapplication.composeui.ViewModel.BookEditViewModel
+import com.example.myapplication.composeui.ViewModel.BookUiState
+import com.example.myapplication.composeui.ViewModel.ImageUploader
+import com.example.myapplication.db.model.Author
+import kotlinx.coroutines.launch
+
+@Composable
+fun BookEdit(navController: NavController, viewModel: BookEditViewModel = viewModel(factory = AppViewModelProvider.Factory), authorViewModel: AuthorDropDownViewModel = viewModel(factory = AppViewModelProvider.Factory)){
+    val coroutineScope = rememberCoroutineScope()
+    authorViewModel.setCurrentAuthor(viewModel.bookUiState.bookDetails.authorId)
+    BookEdit(
+        bookUiState = viewModel.bookUiState,
+        authorUiState = authorViewModel.authorsUiState,
+        onClick = {
+            coroutineScope.launch {
+                viewModel.saveBook()
+                navController.popBackStack()
+            }
+        },
+        authorsListUiState = authorViewModel.authorsListUiState,
+        onUpdate = viewModel::updateUiState,
+        onAuthorUpdate = authorViewModel::updateUiState
+    )
+}
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+private fun AuthorDropDown(
+    authorUiState: AuthorsUiState,
+    authorsListUiState: AuthorsListUiState,
+    onAuthorUpdate: (Author) -> Unit
+) {
+    var expanded: Boolean by remember { mutableStateOf(false) }
+    ExposedDropdownMenuBox(
+        modifier = Modifier
+            .padding(top = 7.dp),
+        expanded = expanded,
+        onExpandedChange = {
+            expanded = !expanded
+        }
+    ) {
+        TextField(
+            value =authorUiState.author?.name ?: stringResource(id = R.string.author_name),
+            onValueChange = {},
+            readOnly = true,
+            modifier = Modifier
+                .fillMaxWidth()
+                .menuAnchor()
+        )
+        DropdownMenu(
+            expanded = expanded,
+            onDismissRequest = { expanded = false },
+            modifier = Modifier
+                .background(Color.White)
+                .exposedDropdownSize()
+        ) {
+            authorsListUiState.authorList.forEach { author ->
+                DropdownMenuItem(
+                    text = {
+                        Text(text = author.name)
+                    },
+                    onClick = {
+                        onAuthorUpdate(author)
+                        expanded = false
+                    }
+                )
+            }
+        }
+    }
+}
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+private fun BookEdit(
+    bookUiState: BookUiState,
+    authorUiState: AuthorsUiState,
+    authorsListUiState: AuthorsListUiState,
+    onClick: () -> Unit,
+    onUpdate: (BookDetails) -> Unit,
+    onAuthorUpdate: (Author) -> Unit
+) {
+    fun handleImageUpload(bitmap: Bitmap) {
+        onUpdate(
+            bookUiState.bookDetails.copy(
+                cover = bitmap
+            )
+        )
+    }
+    var SingletonClass = SingletonClass()
+    onUpdate(bookUiState.bookDetails.copy(userId = SingletonClass.getUserId()))
+    Column(
+        Modifier
+            .fillMaxWidth()
+            .padding(all = 10.dp)
+            .verticalScroll(ScrollState(1))
+    ) {
+        Spacer(modifier = Modifier.size(10.dp))
+        OutlinedTextField(
+            modifier = Modifier.fillMaxWidth(),
+            value = bookUiState.bookDetails.title,
+            onValueChange = { onUpdate(bookUiState.bookDetails.copy(title = it)) },
+            label = { Text("Название книги") },
+            singleLine = true
+        )
+        AuthorDropDown(
+            authorUiState = authorUiState,
+            authorsListUiState = authorsListUiState,
+            onAuthorUpdate = {
+                onUpdate(bookUiState.bookDetails.copy(authorId = it.uid))
+                onAuthorUpdate(it)
+            }
+        )
+        OutlinedTextField(
+            modifier = Modifier.fillMaxWidth(),
+            value = bookUiState.bookDetails.description,
+            onValueChange = { onUpdate(bookUiState.bookDetails.copy(description = it)) },
+            label = { Text("Описание") },
+        )
+        ImageUploader(bitmap = bookUiState.bookDetails.cover, onResult = { bitmap: Bitmap -> handleImageUpload(bitmap)} )
+        OutlinedTextField(
+            modifier = Modifier.fillMaxWidth(),
+            value = bookUiState.bookDetails.content,
+            onValueChange = { onUpdate(bookUiState.bookDetails.copy(content = it)) },
+            label = { Text("Содержание") },
+        )
+        Button(
+            onClick = onClick,
+            enabled = bookUiState.isEntryValid,
+            modifier = Modifier.fillMaxWidth()
+        ) {
+            Text(text = "Сохранить")
+        }
+
+    }
+}

app/src/main/java/com/example/myapplication/composeui/BookRead.kt

@@ -14,9 +14,12 @@ import androidx.compose.ui.Modifier
 import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.unit.dp
 import androidx.compose.material3.Text
+import androidx.compose.runtime.rememberCoroutineScope
 import androidx.compose.ui.tooling.preview.Preview
 import androidx.compose.ui.unit.sp
+import androidx.lifecycle.viewmodel.compose.viewModel
 import androidx.navigation.NavController
+import com.example.myapplication.composeui.ViewModel.BookPageViewModel
 import com.example.myapplication.db.database.AppDatabase
 import com.example.myapplication.db.model.BookWithAuthor
 import com.example.myapplication.ui.theme.MyApplicationTheme
@@ -24,12 +27,12 @@ import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.withContext
 
 @Composable
-fun BookRead(id: Int) {
+fun BookRead(id: Int, viewModel: BookPageViewModel = viewModel(factory = AppViewModelProvider.Factory)) {
-    val context = LocalContext.current
+    val scope = rememberCoroutineScope()
-    val (bookWithAuthor, setBookWithAuthor) = remember { mutableStateOf<BookWithAuthor?>(null) }
+    val book = viewModel.bookPageUiState
     LaunchedEffect(Unit) {
         withContext(Dispatchers.IO) {
-            setBookWithAuthor(AppDatabase.getInstance(context).bookDao().getByUid(id))
+            viewModel.refreshState()
         }
     }
     Column(
@@ -37,7 +40,7 @@ fun BookRead(id: Int) {
             .fillMaxWidth()
             .padding(all = 10.dp)
     ){
-        Text(text = bookWithAuthor?.book?.content ?: "", fontSize=22.sp)
+        Text(text = book?.book?.content ?: "", fontSize=22.sp)
     }
 }
 
@@ -52,4 +55,4 @@ fun BookReadPreview() {
             BookRead(id = 0)
         }
     }
-}
+}

app/src/main/java/com/example/myapplication/composeui/BookSearch.kt

@@ -20,59 +20,36 @@ import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.key
 import androidx.compose.runtime.mutableStateListOf
 import androidx.compose.runtime.remember
+import androidx.compose.runtime.rememberCoroutineScope
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.res.painterResource
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.tooling.preview.Preview
 import androidx.compose.ui.unit.dp
+import androidx.lifecycle.viewmodel.compose.viewModel
 import androidx.navigation.NavController
+import androidx.navigation.compose.rememberNavController
+import androidx.paging.compose.LazyPagingItems
+import androidx.paging.compose.collectAsLazyPagingItems
 import com.example.myapplication.R
+import com.example.myapplication.composeui.ViewModel.SearchPageViewModel
 import com.example.myapplication.composeui.navigation.Screen
 import com.example.myapplication.db.database.AppDatabase
 import com.example.myapplication.db.model.Book
 import com.example.myapplication.ui.theme.MyApplicationTheme
 import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
 
 @Composable
-fun BookSearch(navController: NavController?, text: String) {
+fun BookSearch(navController: NavController, searchStr: String, viewModel: SearchPageViewModel = viewModel(factory = AppViewModelProvider.Factory)) {
-    val context = LocalContext.current
+    val coroutineScope = rememberCoroutineScope()
-    val books = remember { mutableStateListOf<Book>() }
+    val searchPageUiState = viewModel.searchPageUiState
-    LaunchedEffect(Unit) {
+    val searchBook: List<Book> = searchPageUiState.bookList
-        withContext(Dispatchers.IO) {
+    LazyVerticalGrid(columns = GridCells.Adaptive(minSize = 180.dp)) {
-            AppDatabase.getInstance(context).bookDao().getBySearch(text).collect { data ->
+        items(searchBook.size) { index ->
-                books.clear()
+            BookCell(navController = navController, book = searchBook[index]!!.copy())
-                books.addAll(data)
-            }
-        }
-    }
-    Column(Modifier.padding(all = 10.dp)) {
-        LazyVerticalGrid(columns = GridCells.Adaptive(minSize = 180.dp)) {
-            items (books){ book ->
-                key(book.uid) {
-                    val bookId = Screen.BookView.route.replace("{id}", book.uid.toString())
-                    Image(
-                        painter = painterResource(id = book.cover!!),
-                        contentDescription = book.title,
-                        modifier = Modifier
-                            .height(300.dp)
-                            .padding(horizontal = 5.dp)
-                            .clickable(
-                                enabled = true,
-                                onClick = { navController?.navigate(bookId) }
-                            )
-                    )
-                }
-            }
-        }
-        Spacer(Modifier.padding(bottom = 10.dp))
-        Button(
-            modifier = Modifier
-                .fillMaxWidth()
-                .padding(all = 10.dp),
-            onClick = { navController?.navigate(Screen.Loader.route) }) {
-            Text(stringResource(id = R.string.add_book))
         }
     }
 }
@@ -85,7 +62,7 @@ fun BookSearchPreview() {
         Surface(
             color = MaterialTheme.colorScheme.background
         ) {
-            BookSearch(navController = null, "")
+            BookSearch(navController = rememberNavController(), "")
         }
     }
 }

app/src/main/java/com/example/myapplication/composeui/BookView.kt

@@ -1,76 +1,94 @@
 package com.example.myapplication.composeui
 
+import android.content.Context
 import android.content.res.Configuration
+import android.graphics.Bitmap
+import android.graphics.BitmapFactory
+import androidx.compose.foundation.Image
+import androidx.compose.material3.Button
+import androidx.compose.ui.tooling.preview.Preview
+import androidx.compose.material3.Surface
 import androidx.compose.foundation.layout.Column
-import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.padding
-import androidx.compose.material3.Button
+import androidx.compose.foundation.layout.requiredSize
+import androidx.compose.foundation.rememberScrollState
+import androidx.compose.foundation.verticalScroll
 import androidx.compose.material3.ExperimentalMaterial3Api
-import androidx.compose.material3.OutlinedTextField
 import androidx.compose.material3.MaterialTheme
-import androidx.compose.material3.Surface
+import androidx.compose.material3.OutlinedTextField
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
-import androidx.compose.runtime.key
+import androidx.compose.runtime.rememberCoroutineScope
-import androidx.compose.runtime.mutableStateOf
-import androidx.compose.runtime.remember
 import androidx.compose.ui.Modifier
-import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.graphics.asImageBitmap
-import androidx.compose.ui.tooling.preview.Preview
+import androidx.compose.ui.layout.ContentScale
-import androidx.compose.ui.unit.dp
 import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.unit.dp
+import androidx.lifecycle.viewmodel.compose.viewModel
 import androidx.navigation.NavController
 import androidx.navigation.compose.rememberNavController
-import kotlinx.coroutines.withContext
-import kotlinx.coroutines.Dispatchers
-import com.example.myapplication.db.database.AppDatabase;
-import com.example.myapplication.db.model.BookWithAuthor;
 import com.example.myapplication.R
+import com.example.myapplication.composeui.ViewModel.BookPageViewModel
 import com.example.myapplication.composeui.navigation.Screen
 import com.example.myapplication.ui.theme.MyApplicationTheme
 
+private fun getBookImage(context: Context, imageId: String): Bitmap {
+    val inputStream = context.assets.open("${imageId}.jpg")
+    val bitmap = BitmapFactory.decodeStream(inputStream)
+    return bitmap
+}
 @OptIn(ExperimentalMaterial3Api::class)
 @Composable
-fun BookView(navController: NavController?, id: Int) {
+fun BookView(navController: NavController, id: Int, viewModel: BookPageViewModel = viewModel(factory = AppViewModelProvider.Factory)) {
-    val context = LocalContext.current
+    val scope = rememberCoroutineScope()
-    val (bookWithAuthor, setBookWithAuthor) = remember { mutableStateOf<BookWithAuthor?>(null) }
+    val book = viewModel.bookPageUiState
     LaunchedEffect(Unit) {
-        withContext(Dispatchers.IO) {
+        viewModel.refreshState()
-            setBookWithAuthor(AppDatabase.getInstance(context).bookDao().getByUid(id))
-        }
     }
+    val context = LocalContext.current
     Column(
         Modifier
             .fillMaxWidth()
             .padding(all = 10.dp)
+            .verticalScroll(rememberScrollState())
     ) {
-        OutlinedTextField(modifier = Modifier.fillMaxWidth(),
+        Image(
-            value = bookWithAuthor?.book?.title ?: "", onValueChange = {}, readOnly = true,
+            bitmap = book.book?.cover?.asImageBitmap() ?: getBookImage(context, "img").asImageBitmap(),
-            label = {
+            contentDescription = book.book?.title,
-                Text(stringResource(id = R.string.book_title))
+            contentScale = ContentScale.FillBounds,
-            }
-        )
-        OutlinedTextField(modifier = Modifier.fillMaxWidth(),
-            value = bookWithAuthor?.authorName ?: "", onValueChange = {}, readOnly = true,
-            label = {
-                Text(stringResource(id = R.string.author_name))
-            }
-        )
-        OutlinedTextField(modifier = Modifier.fillMaxWidth(),
-            value = bookWithAuthor?.book?.description ?: "", onValueChange = {}, readOnly = true,
-            label = {
-                Text(stringResource(id = R.string.description))
-            }
-        )
-        Spacer(Modifier.padding(bottom = 10.dp))
-        Button(
             modifier = Modifier
+                .fillMaxSize()
+                .requiredSize(400.dp, 400.dp)
+                .padding(0.dp, 10.dp)
+        )
+        Column(
+            Modifier
                 .fillMaxWidth()
-                .padding(all = 10.dp),
+                .padding(all = 10.dp)
-            onClick = { navController?.navigate(Screen.BookRead.route.replace("{id}", id.toString())) }) {
+        ) {
-            Text(stringResource(id = R.string.read_book))
+            OutlinedTextField(modifier = Modifier.fillMaxWidth(),
+                value = book.book?.title ?: "", onValueChange = {}, readOnly = true,
+                label = {
+                    Text(stringResource(id = R.string.book_title))
+                }
+            )
+            OutlinedTextField(modifier = Modifier.fillMaxWidth(),
+                value = book.book?.description ?: "", onValueChange = {}, readOnly = true,
+                label = {
+                    Text(stringResource(id = R.string.description))
+                }
+            )
+            Button(
+                modifier = Modifier
+                    .fillMaxWidth()
+                    .padding(all = 10.dp),
+                onClick = { navController?.navigate(Screen.BookRead.route.replace("{id}", id.toString())) }) {
+                Text(stringResource(id = R.string.read_book))
+            }
         }
     }
 }
@@ -83,7 +101,7 @@ fun BookViewPreview() {
         Surface(
             color = MaterialTheme.colorScheme.background
         ) {
-            BookView(navController = null, id = 0)
+            BookView(navController = rememberNavController(), id = 0)
         }
     }
 }

app/src/main/java/com/example/myapplication/composeui/Catalog.kt

@@ -2,89 +2,70 @@ package com.example.myapplication.composeui
 
 import android.content.res.Configuration
 import androidx.compose.foundation.layout.Column
-import androidx.compose.foundation.layout.Spacer
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.padding
-import androidx.compose.foundation.Image
-import androidx.compose.foundation.clickable
-import androidx.compose.foundation.layout.height
-import androidx.compose.ui.res.painterResource
 import androidx.compose.material3.Button
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Surface
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
-import androidx.compose.runtime.LaunchedEffect
-import androidx.compose.runtime.key
-import androidx.compose.runtime.mutableStateListOf
 import androidx.compose.ui.Modifier
-import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.tooling.preview.Preview
 import androidx.compose.ui.unit.dp
-import androidx.compose.runtime.remember
 import androidx.navigation.NavController
-import kotlinx.coroutines.Dispatchers
-import androidx.compose.ui.platform.LocalContext
-import kotlinx.coroutines.withContext
-import com.example.myapplication.db.database.AppDatabase;
-import com.example.myapplication.db.model.Book;
-import com.example.myapplication.R
 import androidx.compose.foundation.lazy.grid.GridCells
 import androidx.compose.foundation.lazy.grid.LazyVerticalGrid
-import androidx.compose.foundation.lazy.grid.items
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.Add
+import androidx.compose.material3.ButtonDefaults
+import androidx.compose.material3.Icon
+import androidx.compose.runtime.rememberCoroutineScope
+import androidx.lifecycle.viewmodel.compose.viewModel
+import androidx.navigation.compose.rememberNavController
+import androidx.paging.compose.LazyPagingItems
+import androidx.paging.compose.collectAsLazyPagingItems
+import com.example.myapplication.composeui.ViewModel.BookListViewModel
 import com.example.myapplication.composeui.navigation.Screen
+import com.example.myapplication.db.model.Book
 import com.example.myapplication.ui.theme.MyApplicationTheme
 
 @Composable
-fun Catalog(navController: NavController?) {
+fun Catalog(navController: NavController, viewModel: BookListViewModel = viewModel(factory = AppViewModelProvider.Factory)){
-    val context = LocalContext.current
+    val coroutineScope = rememberCoroutineScope()
-    val books = remember { mutableStateListOf<Book>() }
+    val bookListUiState = viewModel.bookListUiState
-    LaunchedEffect(Unit) {
+    val pagingBook: LazyPagingItems<Book> = viewModel.bookPagedData.collectAsLazyPagingItems()
-        withContext(Dispatchers.IO) {
+    Column() {
-            AppDatabase.getInstance(context).bookDao().getAll().collect { data ->
-                books.clear()
-                books.addAll(data)
-            }
-        }
-    }
-    Column(Modifier.padding(all = 10.dp)) {
-        LazyVerticalGrid(columns = GridCells.Adaptive(minSize = 180.dp)) {
-            items (books){ book ->
-                key(book.uid) {
-                    val bookId = Screen.BookView.route.replace("{id}", book.uid.toString())
-                    Image(
-                        painter = painterResource(id = book.cover!!),
-                        contentDescription = book.title,
-                        modifier = Modifier
-                            .height(300.dp)
-                            .padding(horizontal = 5.dp)
-                            .clickable(
-                                enabled = true,
-                                onClick = { navController?.navigate(bookId) }
-                            )
-                    )
-                }
-            }
-        }
         Button(
             modifier = Modifier
                 .fillMaxWidth()
-                .padding(horizontal = 10.dp),
+                .padding(all = 10.dp),
-            onClick = { navController?.navigate(Screen.Loader.route) }) {
+            onClick = {
-            Text(stringResource(id = R.string.add_book))
+                val route = Screen.BookEdit.route.replace("{id}", 0.toString())
+                navController.navigate(route)
+            }
+        ) {
+            Icon(
+                imageVector = Icons.Default.Add,
+                contentDescription = "Добавить",
+            )
+            Text("Добавить")
+        }
+        LazyVerticalGrid(columns = GridCells.Adaptive(minSize = 180.dp)) {
+            items(pagingBook.itemCount) { index ->
+                BookCell(navController = navController, book = pagingBook[index]!!.copy())
+            }
         }
     }
 }
-
+@Preview(name = "Light Mode", uiMode = Configuration.UI_MODE_NIGHT_NO)
-@Preview(name = "Light Mode", showBackground = true, uiMode = Configuration.UI_MODE_NIGHT_NO)
+@Preview(name = "Dark Mode", uiMode = Configuration.UI_MODE_NIGHT_YES)
-@Preview(name = "Dark Mode", showBackground = true, uiMode = Configuration.UI_MODE_NIGHT_YES)
 @Composable
-fun CatalogPreview() {
+private fun CatalogPreview(){
-    MyApplicationTheme {
+    MyApplicationTheme{
         Surface(
             color = MaterialTheme.colorScheme.background
         ) {
-            Catalog(navController = null)
+            Main(navController = rememberNavController())
         }
     }
 }

app/src/main/java/com/example/myapplication/composeui/Enter.kt

@@ -1,6 +1,7 @@
 package com.example.myapplication.composeui
 
 import android.content.res.Configuration
+import android.widget.Toast
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Spacer
 import androidx.compose.foundation.layout.fillMaxWidth
@@ -23,7 +24,11 @@ import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
 import androidx.compose.runtime.setValue
 import androidx.compose.runtime.getValue
+import androidx.compose.runtime.rememberCoroutineScope
 import androidx.compose.ui.platform.LocalContext
+import androidx.navigation.compose.rememberNavController
+import com.example.myapplication.MainActivity
+import com.example.myapplication.SingletonClass
 import com.example.myapplication.composeui.navigation.Screen
 import com.example.myapplication.db.database.AppDatabase
 import com.example.myapplication.db.model.User
@@ -35,16 +40,16 @@ import kotlinx.coroutines.GlobalScope
 
 @OptIn(ExperimentalMaterial3Api::class)
 @Composable
-fun Enter(navController: NavController?) {
+fun Enter(navController: NavController) {
+    var SingletonClass = SingletonClass()
+    val scope = rememberCoroutineScope()
+    val context = LocalContext.current
     var login by remember{mutableStateOf("")}
     var password by remember{mutableStateOf("")}
-    val context = LocalContext.current
+    Column(
-    LaunchedEffect(Unit) {
+        Modifier
-        withContext(Dispatchers.IO) {
+            .fillMaxWidth()
-            AppDatabase.getInstance(context).userDao().getAll()
+            .padding(all = 40.dp)) {
-        }
-    }
-    Column(Modifier.fillMaxWidth().padding(all = 40.dp)) {
         Text(stringResource(id = R.string.login))
         OutlinedTextField(modifier = Modifier.fillMaxWidth(),
             value = login, onValueChange = { login = it  },
@@ -60,17 +65,15 @@ fun Enter(navController: NavController?) {
                 .fillMaxWidth()
                 .padding(all = 10.dp),
             onClick = {
-                var user: User?
+                scope.launch {if( AppDatabase.getInstance(context).userDao().tryLogin(login.toString(), password.toString()) != null){
-                GlobalScope.launch (Dispatchers.Main) {
+                    SingletonClass.setUserId(AppDatabase.getInstance(context).userDao().tryLogin(login.toString(), password.toString())?.uid!!)
-                    user = AppDatabase.getInstance(context).userDao().tryLogin(login, password)
+                    SingletonClass.setRole(AppDatabase.getInstance(context).userDao().tryLogin(login.toString(), password.toString())?.role!!)
-                    if (user != null) {
+                    navController?.navigate(Screen.Profile.route)
-                       //AppDatabase.getInstance(context).userDao().setLogined(user!!.uid!!)
-                        navController?.navigate(Screen.Profile.route)
-                    } else {
-                        password = ""
-                        login = "Неверный логин или пароль"
-                    }
                 }
+                else{
+                    val toast = Toast.makeText(MainActivity.appContext, "Неверный логин или пароль", Toast.LENGTH_SHORT)
+                    toast.show()
+                }}
             }) {
             Text(stringResource(id = R.string.enter))
         }
@@ -85,7 +88,7 @@ fun EnterPreview() {
         Surface(
             color = MaterialTheme.colorScheme.background
         ) {
-            Enter(navController = null)
+            Enter(navController = rememberNavController())
         }
     }
 }

app/src/main/java/com/example/myapplication/composeui/ListAuthors.kt

@@ -2,68 +2,69 @@ package com.example.myapplication.composeui
 
 import android.content.res.Configuration
 import androidx.compose.foundation.layout.Column
-import androidx.compose.foundation.layout.Spacer
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.lazy.grid.GridCells
+import androidx.compose.foundation.lazy.grid.LazyVerticalGrid
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.Add
 import androidx.compose.material3.Button
+import androidx.compose.material3.Icon
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Surface
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
-import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.rememberCoroutineScope
-import androidx.compose.runtime.key
-import androidx.compose.runtime.mutableStateListOf
-import androidx.compose.runtime.remember
 import androidx.compose.ui.Modifier
-import androidx.compose.ui.platform.LocalContext
-import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.tooling.preview.Preview
 import androidx.compose.ui.unit.dp
-import androidx.compose.ui.unit.sp
+import androidx.lifecycle.viewmodel.compose.viewModel
-import com.example.myapplication.R
+import androidx.navigation.NavController
+import androidx.navigation.compose.rememberNavController
+import androidx.paging.compose.LazyPagingItems
+import androidx.paging.compose.collectAsLazyPagingItems
+import com.example.myapplication.composeui.ViewModel.AuthorListViewModel
 import com.example.myapplication.composeui.navigation.Screen
-import com.example.myapplication.db.database.AppDatabase
 import com.example.myapplication.db.model.Author
 import com.example.myapplication.ui.theme.MyApplicationTheme
-import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.withContext
 
 @Composable
-fun ListAuthors() {
+fun ListAuthors(navController: NavController, viewModel: AuthorListViewModel = viewModel(factory = AppViewModelProvider.Factory)){
-    val context = LocalContext.current
+    val coroutineScope = rememberCoroutineScope()
-    val authors = remember { mutableStateListOf<Author>() }
+    val authorListUiState = viewModel.authorListUiState
-    LaunchedEffect(Unit) {
+    val pagingAuthor: LazyPagingItems<Author> = viewModel.authorPagedData.collectAsLazyPagingItems()
-        withContext(Dispatchers.IO) {
+    Column() {
-            AppDatabase.getInstance(context).authorDao().getAll().collect { data ->
-                authors.clear()
-                authors.addAll(data)
-            }
-        }
-    }
-    Column(Modifier.padding(all = 10.dp)) {
-        authors.forEach{ author ->
-            Text(author.name, fontSize = 20.sp)
-        }
-        Spacer(Modifier.padding(bottom = 10.dp))
         Button(
             modifier = Modifier
                 .fillMaxWidth()
                 .padding(all = 10.dp),
-            onClick = {}) {
+            onClick = {
-            Text(stringResource(id = R.string.add_book))
+                val route = Screen.AuthorEdit.route.replace("{id}", 0.toString())
+                navController.navigate(route)
+            }
+        ) {
+            Icon(
+                imageVector = Icons.Default.Add,
+                contentDescription = "Добавить",
+            )
+            Text("Добавить")
+        }
+        LazyVerticalGrid(columns = GridCells.Adaptive(minSize = 180.dp)) {
+            items(pagingAuthor.itemCount) { index ->
+                AuthorCell(navController = navController, author = pagingAuthor[index]!!.copy())
+            }
         }
     }
 }
-
+@Preview(name = "Light Mode", uiMode = Configuration.UI_MODE_NIGHT_NO)
-@Preview(name = "Light Mode", showBackground = true, uiMode = Configuration.UI_MODE_NIGHT_NO)
+@Preview(name = "Dark Mode", uiMode = Configuration.UI_MODE_NIGHT_YES)
-@Preview(name = "Dark Mode", showBackground = true, uiMode = Configuration.UI_MODE_NIGHT_YES)
 @Composable
-fun ListAuthorsPreview() {
+private fun ListAuthorsPreview(){
-    MyApplicationTheme {
+    MyApplicationTheme{
         Surface(
             color = MaterialTheme.colorScheme.background
         ) {
-            ListAuthors()
+            Main(navController = rememberNavController())
         }
     }
 }

app/src/main/java/com/example/myapplication/composeui/Loader.kt

@@ -1,67 +0,0 @@
-package com.example.myapplication.composeui
-
-import android.content.res.Configuration
-import androidx.compose.foundation.layout.Column
-import androidx.compose.foundation.layout.Spacer
-import androidx.compose.foundation.layout.fillMaxWidth
-import androidx.compose.foundation.layout.padding
-import androidx.compose.material3.Button
-import androidx.compose.material3.ExperimentalMaterial3Api
-import androidx.compose.material3.MaterialTheme
-import androidx.compose.material3.OutlinedTextField
-import androidx.compose.material3.Surface
-import androidx.compose.material3.Text
-import androidx.compose.runtime.Composable
-import androidx.compose.runtime.mutableStateOf
-import androidx.compose.runtime.remember
-import androidx.compose.ui.Modifier
-import androidx.compose.ui.graphics.Color
-import androidx.compose.ui.res.stringResource
-import androidx.compose.ui.tooling.preview.Preview
-import androidx.compose.ui.unit.dp
-import com.example.myapplication.R
-import androidx.compose.foundation.BorderStroke
-import androidx.compose.material3.ButtonDefaults
-import com.example.myapplication.ui.theme.MyApplicationTheme
-
-@OptIn(ExperimentalMaterial3Api::class)
-@Composable
-fun Loader() {
-    Column(Modifier.fillMaxWidth().padding(all = 40.dp)) {
-        Text(stringResource(id = R.string.help_me_pls))
-        Spacer(Modifier.padding(bottom = 20.dp))
-        val titleStr = remember{ mutableStateOf("") }
-        Text(stringResource(id = R.string.book_title))
-        OutlinedTextField(modifier = Modifier.fillMaxWidth(),
-            value = titleStr.value, onValueChange = { newText -> titleStr.value = newText },
-        )
-        Spacer(Modifier.padding(bottom = 10.dp))
-        val authorStr = remember{ mutableStateOf("") }
-        Text(stringResource(id = R.string.author_name))
-        OutlinedTextField(modifier = Modifier.fillMaxWidth(),
-            value = authorStr.value, onValueChange = { newText -> authorStr.value = newText },
-        )
-        Spacer(Modifier.padding(bottom = 20.dp))
-        Button(
-            modifier = Modifier
-                .fillMaxWidth()
-                .padding(all = 10.dp),
-            onClick = {}, colors = ButtonDefaults.buttonColors(containerColor = Color.LightGray, contentColor = Color.Black),
-            border = BorderStroke(3.dp, Color.DarkGray)) {
-            Text(stringResource(id = R.string.load_book))
-        }
-    }
-}
-
-@Preview(name = "Light Mode", showBackground = true, uiMode = Configuration.UI_MODE_NIGHT_NO)
-@Preview(name = "Dark Mode", showBackground = true, uiMode = Configuration.UI_MODE_NIGHT_YES)
-@Composable
-fun LoaderPreview() {
-    MyApplicationTheme {
-        Surface(
-            color = MaterialTheme.colorScheme.background
-        ) {
-            Loader()
-        }
-    }
-}

app/src/main/java/com/example/myapplication/composeui/Main.kt

@@ -25,9 +25,10 @@ import androidx.compose.ui.res.painterResource
 import androidx.compose.ui.unit.sp
 import com.example.myapplication.R
 import androidx.compose.ui.layout.ContentScale
+import androidx.navigation.compose.rememberNavController
 
 @Composable
-fun Main(navController: NavController?) {
+fun Main(navController: NavController) {
     Column(Modifier.padding(all = 40.dp)) {
         Text(stringResource(id = R.string.welcome), modifier = Modifier.fillMaxWidth(), fontSize = 24.sp, textAlign = TextAlign.Center)
         Spacer(Modifier.padding(bottom = 20.dp))
@@ -64,7 +65,7 @@ fun MainPreview() {
         Surface(
             color = MaterialTheme.colorScheme.background
         ) {
-            Main(navController = null)
+            Main(navController = rememberNavController())
         }
     }
 }

app/src/main/java/com/example/myapplication/composeui/Profile.kt

@@ -1,7 +1,10 @@
 package com.example.myapplication.composeui
 
+import android.annotation.SuppressLint
 import android.content.res.Configuration
 import androidx.compose.foundation.BorderStroke
+import androidx.compose.foundation.Image
+import androidx.compose.foundation.clickable
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Spacer
 import androidx.compose.foundation.layout.fillMaxWidth
@@ -29,223 +32,55 @@ import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
+import androidx.compose.runtime.rememberCoroutineScope
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.layout.ContentScale
 import androidx.compose.ui.platform.LocalContext
+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.style.TextAlign
 import androidx.compose.ui.tooling.preview.Preview
 import androidx.compose.ui.unit.dp
+import androidx.lifecycle.viewmodel.compose.viewModel
 import androidx.navigation.NavController
+import androidx.navigation.compose.rememberNavController
 import com.example.myapplication.composeui.navigation.Screen
 import com.example.myapplication.db.database.AppDatabase
 import com.example.myapplication.db.model.User
 import com.example.myapplication.R
+import com.example.myapplication.SingletonClass
+import com.example.myapplication.composeui.ViewModel.UserPageViewModel
 import com.example.myapplication.ui.theme.MyApplicationTheme
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.withContext
 
-@OptIn(ExperimentalMaterial3Api::class)
 @Composable
-fun Profile(navController: NavController?) {
+fun Profile(navController: NavController) {
-    val openDialogEdit = remember { mutableStateOf(false) }
+    var SingletonClass = SingletonClass()
-    val openDialogExit = remember { mutableStateOf(false) }
+    Column(Modifier.padding(all = 40.dp)) {
-    val openDialogDelete = remember { mutableStateOf(false) }
+        Image(
-    val context = LocalContext.current
+            painter = painterResource(id = R.drawable.user),
-    val user = remember { mutableStateOf<User>(User("", "", "", "USER")) }
+            contentDescription = "logo",
-    val userOldPsswd = remember { mutableStateOf("") }
+            contentScale = ContentScale.FillWidth,
-    val userNewPsswd = remember { mutableStateOf("") }
+            modifier = Modifier.fillMaxWidth()
-    val userNewPsswdConf = remember { mutableStateOf("") }
+                .clickable(
-    LaunchedEffect(Unit) {
+                    enabled = true,
-        withContext(Dispatchers.IO) {
-            user.value = AppDatabase.getInstance(context).userDao().getByUid(2)
-        }
-    }
-    Column(Modifier.padding(all = 10.dp), horizontalAlignment = Alignment.CenterHorizontally) {
-        OutlinedTextField(modifier = Modifier.fillMaxWidth(),
-            value = user.value.login, onValueChange = {user.value.login = it},
-            label = {
-                Text(stringResource(id = R.string.login))
-            },
-            keyboardOptions = KeyboardOptions(keyboardType = KeyboardType.Text)
-        )
-        OutlinedTextField(modifier = Modifier.fillMaxWidth(),
-            value = user.value.password, onValueChange = {user.value.password = it},
-            label = {
-                Text(stringResource(id = R.string.password))
-            },
-            keyboardOptions = KeyboardOptions(keyboardType = KeyboardType.Text)
-        )
-        OutlinedTextField(modifier = Modifier.fillMaxWidth(),
-            value = user.value.email, onValueChange = {user.value.email = it},
-            label = {
-                Text(stringResource(id = R.string.email))
-            },
-            keyboardOptions = KeyboardOptions(keyboardType = KeyboardType.Text)
-        )
-        Spacer(modifier = Modifier.padding(all = 20.dp))
-        Button(
-            onClick = { openDialogEdit.value = true },
-            shape = CircleShape,
-            modifier = Modifier.fillMaxWidth(fraction = 0.75f),
-            colors = ButtonDefaults.buttonColors(
-                containerColor = MaterialTheme.colorScheme.primaryContainer,
-                contentColor = MaterialTheme.colorScheme.primary
-            )
-        ) {
-            // Inner content including an icon and a text label
-            Icon(
-                imageVector = Icons.Default.Create,
-                contentDescription = "Favorite",
-                modifier = Modifier.size(20.dp)
-            )
-            Spacer(Modifier.size(ButtonDefaults.IconSpacing))
-            Text(text = "Редактировать")
-        }
-        Button(
-            onClick = { openDialogExit.value = true },
-            shape = CircleShape,
-            modifier = Modifier.fillMaxWidth(fraction = 0.75f),
-            colors = ButtonDefaults.buttonColors(
-                containerColor = MaterialTheme.colorScheme.errorContainer,
-                contentColor = MaterialTheme.colorScheme.error
-            )
-        ) {
-            // Inner content including an icon and a text label
-            Icon(
-                imageVector = Icons.Default.Close,
-                contentDescription = "Favorite",
-                modifier = Modifier.size(20.dp)
-            )
-            Spacer(Modifier.size(ButtonDefaults.IconSpacing))
-            Text(text = "Выход")
-        }
-        OutlinedButton(
-            onClick = { openDialogDelete.value = true },
-            shape = CircleShape,
-            modifier = Modifier.fillMaxWidth(fraction = 0.75f),
-            border= BorderStroke(1.dp, MaterialTheme.colorScheme.error),
-            colors = ButtonDefaults.buttonColors(
-                containerColor = Color.Transparent,
-                contentColor = MaterialTheme.colorScheme.error
-            )
-        ) {
-            // Inner content including an icon and a text label
-            Icon(
-                imageVector = Icons.Outlined.Clear,
-                contentDescription = "Удалить",
-                modifier = Modifier.size(20.dp)
-            )
-            Spacer(Modifier.size(ButtonDefaults.IconSpacing))
-            Text(text = "Удалить аккаунт")
-        }
-    }
-    if (openDialogEdit.value) {
-        AlertDialog(
-            icon = {
-                Icon(Icons.Default.Edit, contentDescription = "Example Icon")
-            },
-            title = {
-                Text(text = "Подтверждение")
-            },
-            text = {
-                Text(text = "Вы хотите применить изменения?")
-            },
-            onDismissRequest = {
-                openDialogEdit.value = false
-            },
-            confirmButton = {
-                TextButton(
                     onClick = {
-                        openDialogEdit.value = false
+                        navController?.navigate(
-                        /* TODO */
+                            Screen.ProfileEdit.route.replace(
+                                "{id}",
+                                SingletonClass.getUserId().toString()
+                            )
+                        )
                     }
-                ) {
+                )
-                    Text("Да")
-                }
-            },
-            dismissButton = {
-                TextButton(
-                    onClick = {
-                        openDialogEdit.value = false
-                    }
-                ) {
-                    Text("Нет")
-                }
-            }
-        )
-    }
-    if (openDialogExit.value) {
-        AlertDialog(
-            icon = {
-                Icon(Icons.Default.Close, contentDescription = "Example Icon")
-            },
-            title = {
-                Text(text = "Подтверждение")
-            },
-            text = {
-                Text(text = "Вы хотите выйти из аккаунта?")
-            },
-            onDismissRequest = {
-                openDialogExit.value = false
-            },
-            confirmButton = {
-                TextButton(
-                    onClick = {
-                        openDialogExit.value = false
-                        navController?.navigate(Screen.Enter.route)
-                    }
-                ) {
-                    Text("Да")
-                }
-            },
-            dismissButton = {
-                TextButton(
-                    onClick = {
-                        openDialogExit.value = false
-                    }
-                ) {
-                    Text("Нет")
-                }
-            }
-        )
-    }
-    if (openDialogDelete.value) {
-        AlertDialog(
-            icon = {
-                Icon(Icons.Default.Close, contentDescription = "Example Icon")
-            },
-            title = {
-                Text(text = "Подтверждение")
-            },
-            text = {
-                Text(text = "Вы хотите удалить аккаунт?")
-            },
-            onDismissRequest = {
-                openDialogDelete.value = false
-            },
-            confirmButton = {
-                TextButton(
-                    onClick = {
-                        openDialogDelete.value = false
-                        /* TODO */
-                    }
-                ) {
-                    Text("Да")
-                }
-            },
-            dismissButton = {
-                TextButton(
-                    onClick = {
-                        openDialogDelete.value = false
-                    }
-                ) {
-                    Text("Нет")
-                }
-            }
         )
+        Spacer (Modifier.padding(bottom = 10.dp))
+        Text("Открыть профиль", modifier = Modifier.fillMaxWidth(), textAlign = TextAlign.Center)
     }
 }
 
@@ -258,7 +93,7 @@ fun ProfilePreview() {
         Surface(
             color = MaterialTheme.colorScheme.background
         ) {
-            Profile(navController = null)
+            Profile(navController = rememberNavController())
         }
     }
 }

app/src/main/java/com/example/myapplication/composeui/ProfileEdit.kt

@@ -0,0 +1,115 @@
+package com.example.myapplication.composeui
+
+import android.annotation.SuppressLint
+import android.content.res.Configuration
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.lazy.LazyColumn
+import androidx.compose.foundation.text.KeyboardOptions
+import androidx.compose.material3.Button
+import androidx.compose.material3.ButtonDefaults
+import androidx.compose.material3.ExperimentalMaterial3Api
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.OutlinedTextField
+import androidx.compose.material3.Surface
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.rememberCoroutineScope
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.text.input.KeyboardType
+import androidx.compose.ui.tooling.preview.Preview
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.unit.sp
+import androidx.lifecycle.viewmodel.compose.viewModel
+import androidx.navigation.NavController
+import androidx.navigation.compose.rememberNavController
+import com.example.myapplication.R
+import com.example.myapplication.composeui.ViewModel.UserDetails
+import com.example.myapplication.composeui.ViewModel.UserEditViewModel
+import com.example.myapplication.composeui.ViewModel.UserPageViewModel
+import com.example.myapplication.composeui.ViewModel.UserUiState
+import com.example.myapplication.composeui.navigation.Screen
+import com.example.myapplication.ui.theme.MyApplicationTheme
+import kotlinx.coroutines.launch
+
+@Composable
+fun ProfileEdit(navController: NavController, viewModel: UserEditViewModel = viewModel(factory = AppViewModelProvider.Factory)){
+    val scope = rememberCoroutineScope()
+    viewModel.userUiState.userDetails.login.isBlank()
+    ProfileEdit(
+        navController = navController,
+        userUiState = viewModel.userUiState,
+        onClick = {
+            scope.launch {
+                viewModel.saveUser()
+                navController.popBackStack()
+            }
+        },
+        onUpdate = viewModel::updateUiState
+    )
+}
+
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+private fun ProfileEdit(
+    navController: NavController,
+    userUiState: UserUiState,
+    onClick: () -> Unit,
+    onUpdate: (UserDetails) -> Unit
+){
+    LazyColumn() {
+        item {
+            OutlinedTextField(
+                value = userUiState.userDetails.email,
+                onValueChange = { onUpdate(userUiState.userDetails.copy(email = it)) },
+                singleLine = true,
+                label = { Text("Почта", fontSize = 20.sp) },
+                modifier = Modifier
+                    .fillMaxWidth()
+                    .padding(10.dp, 5.dp)
+            )
+            OutlinedTextField(
+                value = userUiState.userDetails.login,
+                onValueChange = { onUpdate(userUiState.userDetails.copy(login = it)) },
+                label = { Text("Логин", fontSize = 20.sp) },
+                modifier = Modifier
+                    .fillMaxWidth()
+                    .padding(10.dp, 5.dp)
+            )
+            OutlinedTextField(
+                value = userUiState.userDetails.password,
+                onValueChange = { onUpdate(userUiState.userDetails.copy(password = it)) },
+                singleLine = true,
+                label = { Text("Пароль", fontSize = 20.sp) },
+                modifier = Modifier
+                    .fillMaxWidth()
+                    .padding(10.dp, 5.dp)
+            )
+            Button(
+                onClick = onClick,
+                enabled = userUiState.isEntryValid,
+                modifier = Modifier.fillMaxWidth()
+                    .padding(10.dp, 0.dp),
+            ) {
+                    Text("Изменить")
+            }
+            Button(
+                onClick = { navController.popBackStack() },
+                modifier = Modifier
+                    .fillMaxWidth()
+                    .padding(10.dp, 0.dp),
+                colors = ButtonDefaults.buttonColors(containerColor = Color.LightGray, contentColor = Color.Black))
+             {
+                Text("Назад")
+            }
+
+        }
+    }
+}

app/src/main/java/com/example/myapplication/composeui/Registration.kt

@@ -18,38 +18,53 @@ import androidx.compose.ui.tooling.preview.Preview
 import androidx.compose.ui.unit.dp
 import androidx.navigation.NavController
 import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.setValue
+import androidx.compose.runtime.getValue
 import androidx.compose.runtime.remember
+import androidx.compose.runtime.rememberCoroutineScope
+import androidx.compose.ui.platform.LocalContext
+import androidx.navigation.compose.rememberNavController
 import com.example.myapplication.composeui.navigation.Screen
 import com.example.myapplication.ui.theme.MyApplicationTheme
 import com.example.myapplication.R
+import com.example.myapplication.db.database.AppDatabase
+import com.example.myapplication.db.model.User
+import kotlinx.coroutines.launch
 
 @OptIn(ExperimentalMaterial3Api::class)
 @Composable
-fun Registration(navController: NavController?) {
+fun Registration(navController: NavController) {
+    val scope = rememberCoroutineScope()
+    val context = LocalContext.current
     Column(Modifier.fillMaxWidth().padding(all = 40.dp)) {
-        val mailStr = remember{mutableStateOf("")}
+        var mail by remember{mutableStateOf("")}
         Text(stringResource(id = R.string.email))
         OutlinedTextField(modifier = Modifier.fillMaxWidth(),
-            value = mailStr.value, onValueChange = { newText -> mailStr.value = newText },
+            value = mail, onValueChange = { mail = it },
         )
         Spacer(Modifier.padding(bottom = 10.dp))
-        val loginStr = remember{mutableStateOf("")}
+        var login by remember{mutableStateOf("")}
         Text(stringResource(id = R.string.login))
         OutlinedTextField(modifier = Modifier.fillMaxWidth(),
-            value = loginStr.value, onValueChange = { newText -> loginStr.value = newText },
+            value = login, onValueChange = { login = it },
         )
         Spacer(Modifier.padding(bottom = 10.dp))
-        val passwordStr = remember{mutableStateOf("")}
+        var password by remember{mutableStateOf("")}
         Text(stringResource(id = R.string.password))
         OutlinedTextField(modifier = Modifier.fillMaxWidth(),
-            value = passwordStr.value, onValueChange = { newText -> passwordStr.value = newText },
+            value = password, onValueChange = { password = it },
         )
         Spacer(Modifier.padding(bottom = 20.dp))
         Button(
             modifier = Modifier
                 .fillMaxWidth()
                 .padding(all = 10.dp),
-            onClick = { navController?.navigate(Screen.Enter.route) }) {
+            onClick = {
+                scope.launch{
+                    //AppDatabase.getInstance(context).userDao().insert(User(0, login.toString(), password.toString(), mail.toString(), "USER"))
+                }
+                navController?.navigate(Screen.Enter.route)
+            }) {
             Text(stringResource(id = R.string.create_acc))
         }
     }
@@ -63,7 +78,7 @@ fun RegistrationPreview() {
         Surface(
             color = MaterialTheme.colorScheme.background
         ) {
-            Registration(navController = null)
+            Registration(navController = rememberNavController())
         }
     }
 }

app/src/main/java/com/example/myapplication/composeui/Search.kt

@@ -27,6 +27,7 @@ import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.res.colorResource
 import androidx.compose.ui.unit.sp
 import androidx.navigation.NavController
+import androidx.navigation.compose.rememberNavController
 import com.example.myapplication.composeui.navigation.Screen
 import com.example.myapplication.R
 import com.example.myapplication.ui.theme.MyApplicationTheme
@@ -39,7 +40,10 @@ fun Search(navController: NavController?) {
         Modifier
             .fillMaxWidth()
             .padding(all = 40.dp)) {
-        Column(Modifier.background(color = colorResource(R.color.green_200)).padding(all = 20.dp)) {
+        Column(
+            Modifier
+                .background(color = colorResource(R.color.green_200))
+                .padding(all = 20.dp)) {
             Text(stringResource(id = R.string.welcome), color = Color.White)
             Text(stringResource(id = R.string.book_world), color = Color.White)
         }
@@ -57,7 +61,7 @@ fun Search(navController: NavController?) {
                 if(!searchStr.isEmpty()){
                     navController?.navigate(
                         Screen.BookSearch.route.replace(
-                            "{text}",
+                            "{searchStr}",
                             searchStr
                         )
                     )
@@ -76,7 +80,7 @@ fun SearchPreview() {
         Surface(
             color = MaterialTheme.colorScheme.background
         ) {
-            Search(navController=null)
+            Search(navController = rememberNavController())
         }
     }
 }

app/src/main/java/com/example/myapplication/composeui/ViewModel/AuthorDropDownViewModel.kt

@@ -0,0 +1,46 @@
+package com.example.myapplication.composeui.ViewModel
+
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.setValue
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.viewModelScope
+import com.example.myapplication.db.model.Author
+import kotlinx.coroutines.launch
+import com.example.myapplication.db.respository.AuthorRepository
+
+class AuthorDropDownViewModel(
+    private val authorRepository: AuthorRepository
+) : ViewModel() {
+    var authorsListUiState by mutableStateOf(AuthorsListUiState())
+        private set
+
+    var authorsUiState by mutableStateOf(AuthorsUiState())
+        private set
+
+    init {
+        viewModelScope.launch {
+            authorsListUiState = AuthorsListUiState(authorRepository.getAllDrop())
+        }
+    }
+
+    fun setCurrentAuthor(authorId: Int) {
+        val author: Author? =
+            authorsListUiState.authorList.firstOrNull { author -> author.uid == authorId }
+        author?.let { updateUiState(it) }
+    }
+
+    fun updateUiState(author: Author) {
+        authorsUiState = AuthorsUiState(
+            author = author
+        )
+    }
+}
+
+data class AuthorsListUiState(val authorList: List<Author> = listOf())
+
+data class AuthorsUiState(
+    val author: Author? = null
+)
+
+fun Author.toUiState() = AuthorsUiState(author = Author(uid = uid, name = name))

app/src/main/java/com/example/myapplication/composeui/ViewModel/AuthorEditViewModel.kt

@@ -0,0 +1,71 @@
+package com.example.myapplication.composeui.ViewModel
+
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.setValue
+import androidx.lifecycle.SavedStateHandle
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.viewModelScope
+import com.example.myapplication.db.model.Author
+import com.example.myapplication.db.respository.AuthorRepository
+import kotlinx.coroutines.launch
+
+class AuthorEditViewModel(savedStateHandle: SavedStateHandle,
+                        private val authorRepository: AuthorRepository
+) : ViewModel(){
+    var authorUiState by mutableStateOf(AuthorUiState())
+        private set
+
+    private val authorUid: Int = checkNotNull(savedStateHandle["id"])
+    init {
+        viewModelScope.launch {
+            if (authorUid > 0) {
+                authorUiState = authorRepository.getByUid(authorUid)
+                    .toUiState(true)
+            }
+        }
+    }
+
+    fun updateUiState(authorDetails: AuthorDetails) {
+        authorUiState = AuthorUiState(
+            authorDetails = authorDetails,
+            isEntryValid = validateInput(authorDetails)
+        )
+    }
+
+    suspend fun saveAuthor() {
+        if (validateInput()) {
+            if (authorUid > 0) {
+                authorRepository.update(authorUiState.authorDetails.toAuthor(authorUid))
+            } else {
+                authorRepository.insert(authorUiState.authorDetails.toAuthor())
+            }
+        }
+    }
+
+    private fun validateInput(uiState: AuthorDetails = authorUiState.authorDetails): Boolean {
+        return with(uiState) {
+            name.isNotBlank()
+        }
+    }
+}
+data class AuthorUiState(
+    val authorDetails: AuthorDetails = AuthorDetails(),
+    val isEntryValid: Boolean = false
+)
+data class AuthorDetails(
+    val name: String = ""
+)
+fun AuthorDetails.toAuthor(uid: Int = 0): Author = Author(
+    uid = uid,
+    name = name
+)
+
+fun Author.toDetails(): AuthorDetails = AuthorDetails(
+    name = name
+)
+
+fun Author.toUiState(isEntryValid: Boolean = false): AuthorUiState = AuthorUiState(
+    authorDetails = this.toDetails(),
+    isEntryValid = isEntryValid
+)

app/src/main/java/com/example/myapplication/composeui/ViewModel/AuthorListViewModel.kt

@@ -0,0 +1,32 @@
+package com.example.myapplication.composeui.ViewModel
+
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.setValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.viewModelScope
+import androidx.paging.PagingData
+import com.example.myapplication.db.model.Author
+import com.example.myapplication.db.respository.AuthorRepository
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.launch
+
+class AuthorListViewModel(
+    private val authorRepository: AuthorRepository
+) : ViewModel(){
+    var authorListUiState by mutableStateOf(AuthorListUiState())
+        private set
+    init {
+        viewModelScope.launch {
+            refreshState()
+        }
+    }
+    suspend fun refreshState() {
+        authorListUiState = AuthorListUiState(authorRepository.getAll())
+    }
+    val authorPagedData: Flow<PagingData<Author>> = authorRepository.loadAllAuthorsPaged()
+    suspend fun deleteAuthor(author: Author) {
+        authorRepository.delete(author)
+    }
+}
+data class AuthorListUiState(val authorList: List<Author> = listOf())

app/src/main/java/com/example/myapplication/composeui/ViewModel/BookEditViewModel.kt

@@ -0,0 +1,91 @@
+package com.example.myapplication.composeui.ViewModel
+
+import android.graphics.Bitmap
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.setValue
+import androidx.lifecycle.SavedStateHandle
+import androidx.lifecycle.ViewModel
+import com.example.myapplication.db.respository.BookRepository
+import androidx.lifecycle.viewModelScope
+import com.example.myapplication.db.model.Book
+import kotlinx.coroutines.launch
+
+class BookEditViewModel(savedStateHandle: SavedStateHandle,
+                           private val bookRepository: BookRepository) : ViewModel(){
+    var bookUiState by mutableStateOf(BookUiState())
+        private set
+
+    private val bookUid: Int = checkNotNull(savedStateHandle["id"])
+    init {
+        viewModelScope.launch {
+            if (bookUid > 0) {
+                bookUiState = bookRepository.getByUid(bookUid)
+                    .toUiState(true)
+            }
+        }
+    }
+
+    fun updateUiState(bookDetails: BookDetails) {
+        bookUiState = BookUiState(
+            bookDetails = bookDetails,
+            isEntryValid = validateInput(bookDetails)
+        )
+    }
+
+    suspend fun saveBook() {
+        if (validateInput()) {
+            if (bookUid > 0) {
+                bookRepository.update(bookUiState.bookDetails.toBook(bookUid))
+            } else {
+                bookRepository.insert(bookUiState.bookDetails.toBook())
+            }
+        }
+    }
+
+    private fun validateInput(uiState: BookDetails = bookUiState.bookDetails): Boolean {
+        return with(uiState) {
+            title.isNotBlank()
+                    && description.isNotBlank()
+                    && content.isNotBlank()
+                    && cover != null
+                    && authorId >= 0
+                    && userId >= 0
+        }
+    }
+}
+data class BookUiState(
+    val bookDetails: BookDetails = BookDetails(),
+    val isEntryValid: Boolean = false
+)
+data class BookDetails(
+    val title: String = "",
+    val description: String = "",
+    val content: String = "",
+    val cover: Bitmap? = null,
+    val authorId: Int = 0,
+    val userId: Int = 0,
+)
+fun BookDetails.toBook(uid: Int = 0): Book = Book(
+    uid = uid,
+    title = title,
+    description = description,
+    content = content,
+    cover = cover,
+    authorId = authorId,
+    userId = userId
+)
+
+fun Book.toDetails(): BookDetails = BookDetails(
+    title = title,
+    description = description,
+    content = content,
+    cover = cover,
+    authorId = authorId,
+    userId = userId
+)
+
+fun Book.toUiState(isEntryValid: Boolean = false): BookUiState = BookUiState(
+    bookDetails = this.toDetails(),
+    isEntryValid = isEntryValid
+)

app/src/main/java/com/example/myapplication/composeui/ViewModel/BookListViewModel.kt

@@ -0,0 +1,33 @@
+package com.example.myapplication.composeui.ViewModel
+
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.setValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.viewModelScope
+import androidx.paging.PagingData
+import com.example.myapplication.db.model.Book
+import com.example.myapplication.db.respository.BookRepository
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.flow.Flow
+
+class BookListViewModel(
+    private val bookRepository: BookRepository
+) : ViewModel() {
+    var bookListUiState by mutableStateOf(BookListUiState())
+        private set
+    init {
+        viewModelScope.launch {
+            refreshState()
+        }
+    }
+    suspend fun refreshState() {
+        bookListUiState = BookListUiState(bookRepository.getAll())
+    }
+    val bookPagedData: Flow<PagingData<Book>> = bookRepository.loadAllBooksPaged()
+    suspend fun deleteBook(book: Book) {
+        bookRepository.delete(book)
+    }
+}
+
+data class BookListUiState(val bookList: List<Book> = listOf())

app/src/main/java/com/example/myapplication/composeui/ViewModel/BookPageViewModel.kt

@@ -0,0 +1,33 @@
+package com.example.myapplication.composeui.ViewModel
+
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.setValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.viewModelScope
+import androidx.lifecycle.SavedStateHandle
+import com.example.myapplication.db.model.Book
+import com.example.myapplication.db.model.BookWithAuthor
+import com.example.myapplication.db.respository.BookRepository
+import kotlinx.coroutines.launch
+
+class BookPageViewModel(private val bookRespository: BookRepository, savedStateHandle: SavedStateHandle) : ViewModel(){
+    private val bookId: Int = checkNotNull(savedStateHandle["id"])
+    var bookPageUiState by mutableStateOf(BookPageUiState())
+        private set
+    init {
+        viewModelScope.launch {
+            if (bookId > 0) {
+                refreshState()
+            }
+        }
+    }
+    suspend fun refreshState() {
+        bookPageUiState = BookPageUiState(bookRespository.getByUid(bookId))
+    }
+    suspend fun deleteBook(book: Book) {
+        bookRespository.delete(book)
+    }
+}
+
+data class BookPageUiState(val book: Book? = null)

app/src/main/java/com/example/myapplication/composeui/ViewModel/ImageUploader.kt

@@ -0,0 +1,126 @@
+package com.example.myapplication.composeui.ViewModel
+
+import android.content.res.Configuration
+import android.graphics.Bitmap
+import android.graphics.BitmapFactory
+import android.net.Uri
+import androidx.activity.compose.rememberLauncherForActivityResult
+import androidx.activity.result.contract.ActivityResultContracts
+import androidx.compose.foundation.Image
+import androidx.compose.foundation.background
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.IntrinsicSize
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.aspectRatio
+import androidx.compose.foundation.layout.fillMaxHeight
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.width
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material3.Button
+import androidx.compose.material3.Icon
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.asImageBitmap
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.res.painterResource
+import androidx.compose.ui.tooling.preview.Preview
+import androidx.compose.ui.unit.dp
+import com.example.myapplication.R
+
+@Composable
+fun ImageUploader(
+    bitmap: Bitmap?,
+    onResult: (Bitmap) -> Unit
+) {
+    val context = LocalContext.current
+    val title: String = if (bitmap == null) {
+        "Не загружено"
+    } else {
+        "Размер: " + bitmap.width + " " + bitmap.height
+    }
+
+    val launcher = rememberLauncherForActivityResult(
+        contract = ActivityResultContracts.GetContent(),
+        onResult = { uri: Uri? ->
+            uri?.let {
+                val inputStream = context.contentResolver.openInputStream(uri)
+                val newBitmap: Bitmap = BitmapFactory.decodeStream(inputStream)
+                val scaledBitmap = resizeBitmapWithAspectRatio(newBitmap, 200)
+                onResult(scaledBitmap)
+            }
+        }
+    )
+
+    Row(
+        modifier = Modifier.height(IntrinsicSize.Min)
+    ) {
+        Box(
+            contentAlignment = Alignment.Center,
+            modifier = Modifier
+                .background(
+                    color = MaterialTheme.colorScheme.surface,
+                    shape = RoundedCornerShape(10.dp)
+                )
+                .weight(0.25F)
+                .aspectRatio(1F)
+        ) {
+            if (bitmap != null) {
+                Image(
+                    bitmap = bitmap.asImageBitmap(),
+                    contentDescription = null,
+                    modifier = Modifier.width(100.dp)
+                )
+            } else {
+                Icon(
+                    painter = painterResource(R.drawable.ic_camera),
+                    contentDescription = null,
+                    tint = MaterialTheme.colorScheme.onBackground
+                )
+            }
+        }
+        Spacer(modifier = Modifier.width(10.dp))
+        Column(
+            modifier = Modifier
+                .background(
+                    color = MaterialTheme.colorScheme.surface,
+                    shape = RoundedCornerShape(10.dp)
+                )
+                .fillMaxHeight()
+                .padding(10.dp)
+                .weight(0.75F)
+        ) {
+            Text(
+                text = title,
+                color = MaterialTheme.colorScheme.onBackground,
+                style = MaterialTheme.typography.labelMedium
+            )
+            Spacer(modifier = Modifier.weight(1F))
+            Button(
+                onClick = { launcher.launch("image/*") },
+            ){
+                Text(text = "+")
+            }
+        }
+    }
+}
+fun resizeBitmapWithAspectRatio(bitmap: Bitmap, maxHeight: Int): Bitmap {
+    if (bitmap.height <= maxHeight) {
+        return bitmap
+    }
+
+    val aspectRatio = bitmap.width.toFloat() / bitmap.height
+    val newWidth = (maxHeight * aspectRatio).toInt()
+
+    return Bitmap.createScaledBitmap(bitmap, newWidth, maxHeight, true)
+}
+@Preview(name = "Light Mode", uiMode = Configuration.UI_MODE_NIGHT_NO)
+@Preview(name = "Dark Mode", uiMode = Configuration.UI_MODE_NIGHT_YES)
+@Composable
+private fun CuteImageLoaderPreview() {
+}

app/src/main/java/com/example/myapplication/composeui/ViewModel/SearchPageViewModel.kt

@@ -0,0 +1,31 @@
+package com.example.myapplication.composeui.ViewModel
+
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.setValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.lifecycle.SavedStateHandle
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.viewModelScope
+import androidx.paging.PagingData
+import com.example.myapplication.db.model.Book
+import com.example.myapplication.db.respository.BookRepository
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.flow.Flow
+
+class SearchPageViewModel(private val bookRepository: BookRepository, savedStateHandle: SavedStateHandle) : ViewModel(){
+    private val searchStr: String = checkNotNull(savedStateHandle["searchStr"])
+    var searchPageUiState by mutableStateOf(SearchPageUiState())
+        private set
+    init {
+        viewModelScope.launch {
+            refreshState()
+        }
+    }
+    suspend fun refreshState() {
+        searchPageUiState = SearchPageUiState(bookRepository.getBySearch(searchStr))
+    }
+
+    val bookPagedData: Flow<PagingData<Book>> = bookRepository.loadAllBooksPaged()
+}
+
+data class SearchPageUiState(val bookList: List<Book> = listOf())

app/src/main/java/com/example/myapplication/composeui/ViewModel/UserEditViewModel.kt

@@ -0,0 +1,84 @@
+package com.example.myapplication.composeui.ViewModel
+
+import android.graphics.Bitmap
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.setValue
+import androidx.lifecycle.SavedStateHandle
+import androidx.lifecycle.ViewModel
+import com.example.myapplication.db.respository.UserRepository
+import androidx.lifecycle.viewModelScope
+import com.example.myapplication.db.model.User
+import kotlinx.coroutines.launch
+
+class UserEditViewModel(savedStateHandle: SavedStateHandle,
+                        private val userRepository: UserRepository
+) : ViewModel(){
+    var userUiState by mutableStateOf(UserUiState())
+        private set
+
+    private val userUid: Int = checkNotNull(savedStateHandle["id"])
+    init {
+        viewModelScope.launch {
+            if (userUid > 0) {
+                userUiState = userRepository.getByUid(userUid)
+                    .toUiState(true)
+            }
+        }
+    }
+
+    fun updateUiState(userDetails: UserDetails) {
+        userUiState = UserUiState(
+            userDetails = userDetails,
+            isEntryValid = validateInput(userDetails)
+        )
+    }
+
+    suspend fun saveUser() {
+        if (validateInput()) {
+            if (userUid > 0) {
+                userRepository.update(userUiState.userDetails.toUser(userUid))
+            } else {
+                userRepository.insert(userUiState.userDetails.toUser())
+            }
+        }
+    }
+
+    private fun validateInput(uiState: UserDetails = userUiState.userDetails): Boolean {
+        return with(uiState) {
+            login.isNotBlank()
+                    && password.isNotBlank()
+                    && email.isNotBlank()
+                    && role.isNotBlank()
+        }
+    }
+}
+data class UserUiState(
+    val userDetails: UserDetails = UserDetails(),
+    val isEntryValid: Boolean = false
+)
+data class UserDetails(
+    val login: String = "",
+    val password: String = "",
+    val email: String = "",
+    val role: String = ""
+)
+fun UserDetails.toUser(uid: Int = 0): User = User(
+    uid = uid,
+    login = login,
+    password = password,
+    email = email,
+    role = role
+)
+
+fun User.toDetails(): UserDetails = UserDetails(
+    login = login,
+    password = password,
+    email = email,
+    role = role
+)
+
+fun User.toUiState(isEntryValid: Boolean = false): UserUiState = UserUiState(
+    userDetails = this.toDetails(),
+    isEntryValid = isEntryValid
+)

app/src/main/java/com/example/myapplication/composeui/ViewModel/UserPageViewModel.kt

@@ -0,0 +1,31 @@
+package com.example.myapplication.composeui.ViewModel
+
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.setValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.viewModelScope
+import androidx.lifecycle.SavedStateHandle
+import com.example.myapplication.db.model.User
+import kotlinx.coroutines.launch
+import com.example.myapplication.db.respository.UserRepository
+
+
+class UserPageViewModel(savedStateHandle: SavedStateHandle, private val userRepository: UserRepository) : ViewModel(){
+    private val userId: Int = checkNotNull(savedStateHandle["id"])
+    var userPageUiState by mutableStateOf(UserPageUiState())
+        private set
+    init {
+        viewModelScope.launch {
+            if (userId > 0) {
+                refreshState()
+            }
+        }
+    }
+    suspend fun refreshState() {
+        userPageUiState = UserPageUiState(userRepository.getByUid(userId))
+    }
+
+}
+
+data class UserPageUiState(val user: User? = null)

app/src/main/java/com/example/myapplication/composeui/navigation/MainNavbar.kt

@@ -5,6 +5,7 @@ import androidx.compose.foundation.layout.PaddingValues
 import androidx.compose.foundation.layout.padding
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.ArrowBack
+import androidx.compose.foundation.layout.Box
 import androidx.compose.material3.ExperimentalMaterial3Api
 import androidx.compose.material3.Icon
 import androidx.compose.material3.IconButton
@@ -19,8 +20,10 @@ import androidx.compose.material3.TopAppBarDefaults
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.getValue
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.shadow
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.tooling.preview.Preview
+import androidx.compose.ui.unit.dp
 import androidx.navigation.NavDestination
 import androidx.navigation.NavDestination.Companion.hierarchy
 import androidx.navigation.NavGraph.Companion.findStartDestination
@@ -37,13 +40,15 @@ import com.example.myapplication.composeui.Main
 import com.example.myapplication.composeui.Registration
 import com.example.myapplication.composeui.Enter
 import com.example.myapplication.composeui.Profile
+import com.example.myapplication.composeui.ProfileEdit
 import com.example.myapplication.composeui.Search
-import com.example.myapplication.composeui.Loader
 import com.example.myapplication.composeui.Catalog
 import com.example.myapplication.composeui.BookView
 import com.example.myapplication.composeui.BookRead
+import com.example.myapplication.composeui.BookEdit
 import com.example.myapplication.composeui.BookSearch
 import com.example.myapplication.composeui.ListAuthors
+import com.example.myapplication.composeui.AuthorEdit
 
 @OptIn(ExperimentalMaterial3Api::class)
 @Composable
@@ -51,29 +56,31 @@ fun Topbar(
     navController: NavHostController,
     currentScreen: Screen?
 ) {
-    TopAppBar(
+    Box(modifier = Modifier.shadow(1.dp)) {
-        colors = TopAppBarDefaults.smallTopAppBarColors(
+        TopAppBar(
-            containerColor = MaterialTheme.colorScheme.primary,
+            colors = TopAppBarDefaults.smallTopAppBarColors(
-            titleContentColor = MaterialTheme.colorScheme.onPrimary,
+                containerColor = MaterialTheme.colorScheme.primary,
-        ),
+                titleContentColor = MaterialTheme.colorScheme.onPrimary,
-        title = {
+            ),
-            Text(stringResource(currentScreen?.resourceId ?: R.string.app_name))
+            title = {
-        },
+                Text(stringResource(currentScreen?.resourceId ?: R.string.app_name))
-        navigationIcon = {
+            },
-            if (
+            navigationIcon = {
-                navController.previousBackStackEntry != null
+                if (
-                && (currentScreen == null || !currentScreen.showInBottomBar)
+                    navController.previousBackStackEntry != null
-            ) {
+                    && (currentScreen == null || !currentScreen.showInBottomBar)
-                IconButton(onClick = { navController.navigateUp() }) {
+                ) {
-                    Icon(
+                    IconButton(onClick = { navController.navigateUp() }) {
-                        imageVector = Icons.Filled.ArrowBack,
+                        Icon(
-                        contentDescription = null,
+                            imageVector = Icons.Filled.ArrowBack,
-                        tint = MaterialTheme.colorScheme.onPrimary
+                            contentDescription = null,
-                    )
+                            tint = MaterialTheme.colorScheme.onPrimary
+                        )
+                    }
                 }
             }
-        }
+        )
-    )
+    }
 }
 
 @Composable
@@ -117,10 +124,14 @@ fun Navhost(
         composable(Screen.Registration.route) { Registration(navController) }
         composable(Screen.Enter.route) { Enter(navController) }
         composable(Screen.Profile.route) { Profile(navController) }
+        composable(
+            Screen.ProfileEdit.route,
+            arguments = listOf(navArgument("id") { type = NavType.IntType })
+        ) { backStackEntry ->
+            backStackEntry.arguments?.let { ProfileEdit(navController) }
+        }
         composable(Screen.Search.route) { Search(navController) }
-        composable(Screen.Loader.route) { Loader() }
         composable(Screen.Catalog.route) { Catalog(navController) }
-        composable(Screen.ListAuthors.route) { ListAuthors() }
         composable(
             Screen.BookView.route,
             arguments = listOf(navArgument("id") { type = NavType.IntType })
@@ -134,10 +145,23 @@ fun Navhost(
             backStackEntry.arguments?.let { BookRead(it.getInt("id")) }
         }
         composable(
-            Screen.BookSearch.route,
+            Screen.BookEdit.route,
-            arguments = listOf(navArgument("text") { type = NavType.StringType })
+            arguments = listOf(navArgument("id") { type = NavType.IntType })
         ) { backStackEntry ->
-            backStackEntry.arguments?.let { BookSearch(navController = navController ,it.getString ("text", "")) }
+            backStackEntry.arguments?.let { BookEdit(navController) }
+        }
+        composable(Screen.ListAuthors.route) { ListAuthors(navController) }
+        composable(
+            Screen.AuthorEdit.route,
+            arguments = listOf(navArgument("id") { type = NavType.IntType })
+        ) { backStackEntry ->
+            backStackEntry.arguments?.let { AuthorEdit(navController) }
+        }
+        composable(
+            Screen.BookSearch.route,
+            arguments = listOf(navArgument("searchStr") { type = NavType.StringType })
+        ) { backStackEntry ->
+            backStackEntry.arguments?.let { BookSearch(navController = navController ,it.getString ("searchStr", "")) }
         }
     }
 }

app/src/main/java/com/example/myapplication/composeui/navigation/Screen.kt

@@ -28,6 +28,9 @@ enum class Screen(
     Profile(
         "profile", R.string.profile, Icons.Filled.AccountCircle
     ),
+    ProfileEdit(
+        "profile-edit/{id}", R.string.profile, showInBottomBar = false
+    ),
     Search(
         "search", R.string.search, Icons.Filled.Search
     ),
@@ -37,15 +40,18 @@ enum class Screen(
     ListAuthors(
         "listauthors", R.string.listauthors, Icons.Filled.Face
     ),
-    Loader(
+    AuthorEdit(
-        "loader", R.string.loader, showInBottomBar = false
+        "author-edit/{id}", R.string.book_view_title, showInBottomBar = false
     ),
     BookSearch(
-        "book-search/{text}", R.string.search, showInBottomBar = false
+        "book-search/{searchStr}", R.string.search, showInBottomBar = false
     ),
     BookView(
         "book-view/{id}", R.string.book_view_title, showInBottomBar = false
     ),
+    BookEdit(
+        "book-edit/{id}", R.string.book_view_title, showInBottomBar = false
+    ),
     BookRead(
         "book-read/{id}", R.string.book_view_title, showInBottomBar = false
     );

app/src/main/java/com/example/myapplication/db/dao/AuthorDao.kt

@@ -1,18 +1,24 @@
 package com.example.myapplication.db.dao
 
+import androidx.paging.PagingSource
 import androidx.room.Dao
 import androidx.room.Delete
 import androidx.room.Insert
 import androidx.room.Query
 import androidx.room.Update
-import com.example.myapplication.db.model.Author;
+import com.example.myapplication.db.model.Author
-import com.example.myapplication.db.model.Book
 import kotlinx.coroutines.flow.Flow
 
 @Dao
 interface AuthorDao {
     @Query("select * from authors order by author_name collate nocase asc")
-    fun getAll(): Flow<List<Author>>
+    suspend fun getAll(): List<Author>
+    @Query("select * from authors order by author_name collate nocase asc")
+    suspend fun getAllDrop(): List<Author>
+    @Query("select * from authors where authors.uid = :uid")
+    suspend fun getByUid(uid: Int): Author
+    @Query("select * from authors order by author_name collate nocase asc")
+    fun loadAllAuthorsPaged(): PagingSource<Int, Author>
 
     @Insert
     suspend fun insert(author: Author)

app/src/main/java/com/example/myapplication/db/dao/BookDao.kt

@@ -1,5 +1,6 @@
 package com.example.myapplication.db.dao
 
+import androidx.paging.PagingSource
 import androidx.room.Dao
 import androidx.room.Delete
 import androidx.room.Insert
@@ -12,13 +13,13 @@ import com.example.myapplication.db.model.BookWithAuthor;
 @Dao
 interface BookDao {
     @Query("select * from books order by title collate nocase asc")
-    fun getAll(): Flow<List<Book>>
+    suspend fun getAll(): List<Book>
 
-    @Query("select * from books left join authors on books.author_id = authors.uid where books.uid = :uid")
+    @Query("select * from books where books.uid = :uid")
-    suspend fun getByUid(uid: Int): BookWithAuthor
+    suspend fun getByUid(uid: Int): Book
 
     @Query("select * from books where books.title LIKE '%' || :searchStr || '%'")
-    fun getBySearch(searchStr: String): Flow<List<Book>>
+    suspend fun getBySearch(searchStr: String): List<Book>
 
     @Query("select * from books where books.user_id = :userId")
     fun getByUserId(userId: Int): Flow<List<Book>>
@@ -26,6 +27,9 @@ interface BookDao {
     @Query("select * from books where books.author_id = :authorId")
     fun getByAuthorId(authorId: Int): Flow<List<Book>>
 
+    @Query("select * from books order by title collate nocase asc")
+    fun loadAllBooksPaged(): PagingSource<Int, Book>
+
     @Insert
     suspend fun insert(book: Book)
 

app/src/main/java/com/example/myapplication/db/dao/UserDao.kt

@@ -7,18 +7,22 @@ import androidx.room.Query
 import androidx.room.Update
 import kotlinx.coroutines.flow.Flow
 import com.example.myapplication.db.model.User;
+import com.example.myapplication.db.model.Book;
 
 @Dao
 interface UserDao {
     @Query("select * from users")
     fun getAll(): Flow<List<User>>
 
-    @Query("select * from users where login = :login and password = :password")
-    suspend fun tryLogin(login: String, password: String): User?
-
     @Query("select * from users where users.uid = :uid")
     suspend fun getByUid(uid: Int): User
 
+    @Query("select * from books where books.user_id = :userid")
+    fun getUserBooks(userid: Int): Flow<List<Book>>
+
+    @Query("select * from users where login = :login and password = :password")
+    suspend fun tryLogin(login: String, password: String): User?
+
     @Insert
     suspend fun insert(user: User)
 

app/src/main/java/com/example/myapplication/db/database/AppContainer.kt

@@ -0,0 +1,38 @@
+package com.example.myapplication.db.database
+
+import android.content.Context
+import com.example.myapplication.db.dao.BookDao
+import com.example.myapplication.db.dao.AuthorDao
+import com.example.myapplication.db.dao.UserDao
+import com.example.myapplication.db.respository.BookRepository
+import com.example.myapplication.db.respository.AuthorRepository
+import com.example.myapplication.db.respository.UserRepository
+import com.example.myapplication.db.respository.OfflineBookRepository
+import com.example.myapplication.db.respository.OfflineAuthorRepository
+import com.example.myapplication.db.respository.OfflineUserRepository
+
+interface AppContainer {
+    val bookRepository: BookRepository
+    val authorRepository: AuthorRepository
+    val userRepository: UserRepository
+    companion object {
+        const val TIMEOUT = 5000L
+        const val LIMIT = 10
+    }
+}
+
+class AppDataContainer(private val context: Context) : AppContainer {
+    override val bookRepository: BookRepository by lazy {
+        OfflineBookRepository(AppDatabase.getInstance(context).bookDao())
+    }
+    override val authorRepository: AuthorRepository by lazy {
+        OfflineAuthorRepository(AppDatabase.getInstance(context).authorDao())
+    }
+    override val userRepository: UserRepository by lazy {
+        OfflineUserRepository(AppDatabase.getInstance(context).userDao())
+    }
+
+    companion object {
+        const val TIMEOUT = 5000L
+    }
+}

app/src/main/java/com/example/myapplication/db/database/AppDatabase.kt

@@ -1,9 +1,12 @@
 package com.example.myapplication.db.database
 
 import android.content.Context
+import android.graphics.Bitmap
+import android.graphics.BitmapFactory
 import androidx.room.Database
 import androidx.room.Room
 import androidx.room.RoomDatabase
+import androidx.room.TypeConverters
 import androidx.sqlite.db.SupportSQLiteDatabase
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
@@ -17,18 +20,19 @@ import com.example.myapplication.db.model.Author;
 import com.example.myapplication.R
 
 @Database(entities = [Book::class, Author::class, User::class], version = 1, exportSchema = false)
+@TypeConverters(Converters::class)
 abstract class AppDatabase : RoomDatabase() {
     abstract fun bookDao(): BookDao
     abstract fun authorDao(): AuthorDao
     abstract fun userDao(): UserDao
 
     companion object {
-        private const val DB_NAME: String = "PMU"
+        private const val DB_NAME: String = "PMU1"
 
         @Volatile
         private var INSTANCE: AppDatabase? = null
 
-        private suspend fun populateDatabase() {
+        private suspend fun populateDatabase(context: Context) {
             INSTANCE?.let { database ->
                 //Users
                 val userDao = database.userDao()
@@ -46,10 +50,10 @@ abstract class AppDatabase : RoomDatabase() {
                 authorDao.insert(author3)
                 // Books
                 val bookDao = database.bookDao()
-                val book1 = Book(1,"1984", "Роман о том, как репрессивная машина тоталитарного государства может уничтожить любую личность.", "Был холодный ясный апрельский день, и часы пробили тринадцать.\n" + "Уинстон Смит, прижав подбородок к груди и ежась от омерзительного ветра, быстро скользнул в стеклянные двери Дома Победы, но все же вихрь песка и пыли успел ворваться вместе с ним.", R.drawable.or1984, 1, 1)
+                val book1 = Book(1,"1984", "Роман о том, как репрессивная машина тоталитарного государства может уничтожить любую личность.", "Был холодный ясный апрельский день, и часы пробили тринадцать.\n" + "Уинстон Смит, прижав подбородок к груди и ежась от омерзительного ветра, быстро скользнул в стеклянные двери Дома Победы, но все же вихрь песка и пыли успел ворваться вместе с ним.", getBookImage(context,"or1984"), 1, 1)
-                val book2 = Book(2,"Собачье сердце", "Роман о бродячем псе Шарике, превращенном в человека.", "У‑у-у-у-у-гу-гуг-гуу! О, гляньте на меня, я погибаю.\n" + "Вьюга в подворотне ревёт мне отходную, и я вою с ней.\n" + "Пропал я, пропал.", R.drawable.dogsheart, 2, 1)
+                val book2 = Book(2,"Собачье сердце", "Роман о бродячем псе Шарике, превращенном в человека.", "У‑у-у-у-у-гу-гуг-гуу! О, гляньте на меня, я погибаю.\n" + "Вьюга в подворотне ревёт мне отходную, и я вою с ней.\n" + "Пропал я, пропал.", getBookImage(context,"dogsheart"), 2, 1)
-                val book3 = Book(3,"Вельд", "Рассказ о зависимости от технических устройств, потере человечности.", "— Джорджи, пожалуйста, посмотри детскую комнату.\n" + "— А что с ней?\n" + "— Не знаю.\n" + "— Так в чем же дело?", R.drawable.veld, 3, 1)
+                val book3 = Book(3,"Вельд", "Рассказ о зависимости от технических устройств, потере человечности.", "— Джорджи, пожалуйста, посмотри детскую комнату.\n" + "— А что с ней?\n" + "— Не знаю.\n" + "— Так в чем же дело?", getBookImage(context,"veld"), 3, 1)
-                val book4 = Book(4,"Роковые яйца", "Рассказ, критикующий стремление к прогрессу без учета последствий.","16 апреля 1928 года, вечером, профессор зоологии IV государственного университета и директор зооинститута в Москве Персиков вошел в свой кабинет, помещающийся в зооинституте, что на улице Герцена.\n" + "Профессор зажег верхний матовый шар и огляделся.", R.drawable.eggs, 2, 2)
+                val book4 = Book(4,"Роковые яйца", "Рассказ, критикующий стремление к прогрессу без учета последствий.","16 апреля 1928 года, вечером, профессор зоологии IV государственного университета и директор зооинститута в Москве Персиков вошел в свой кабинет, помещающийся в зооинституте, что на улице Герцена.\n" + "Профессор зажег верхний матовый шар и огляделся.", getBookImage(context,"eggs"), 2, 2)
                 bookDao.insert(book1)
                 bookDao.insert(book2)
                 bookDao.insert(book3)
@@ -68,7 +72,7 @@ abstract class AppDatabase : RoomDatabase() {
                         override fun onCreate(db: SupportSQLiteDatabase) {
                             super.onCreate(db)
                             CoroutineScope(Dispatchers.IO).launch {
-                                populateDatabase()
+                                populateDatabase(appContext)
                             }
                         }
                     })
@@ -76,5 +80,10 @@ abstract class AppDatabase : RoomDatabase() {
                     .also { INSTANCE = it }
             }
         }
+        private fun getBookImage(context: Context, imageId: String): Bitmap {
+            val inputStream = context.assets.open("${imageId}.jpg")
+            val bitmap = BitmapFactory.decodeStream(inputStream)
+            return bitmap
+        }
     }
 }

app/src/main/java/com/example/myapplication/db/database/Converters.kt

@@ -0,0 +1,20 @@
+package com.example.myapplication.db.database
+
+import android.graphics.Bitmap
+import android.graphics.BitmapFactory
+import androidx.room.TypeConverter
+import java.io.ByteArrayOutputStream
+
+class Converters {
+    @TypeConverter
+    fun fromBitmap(bitmap: Bitmap): ByteArray {
+        val outputStream = ByteArrayOutputStream()
+        bitmap.compress(Bitmap.CompressFormat.JPEG, 1, outputStream)
+        return outputStream.toByteArray()
+    }
+
+    @TypeConverter
+    fun toBitmap(byteArray: ByteArray): Bitmap {
+        return BitmapFactory.decodeByteArray(byteArray, 0, byteArray.size)
+    }
+}

app/src/main/java/com/example/myapplication/db/model/Author.kt

@@ -8,14 +8,10 @@ import androidx.room.PrimaryKey
 @Entity(tableName = "authors")
 data class Author(
     @PrimaryKey(autoGenerate = true)
-    val uid: Int?,
+    val uid: Int = 0,
     @ColumnInfo(name = "author_name")
     val name: String
 ) {
-    @Ignore
-    constructor(
-        name: String
-    ) : this(null, name)
     override fun equals(other: Any?): Boolean {
         if (this === other) return true
         if (javaClass != other?.javaClass) return false

app/src/main/java/com/example/myapplication/db/model/Book.kt

@@ -1,5 +1,6 @@
 package com.example.myapplication.db.model
 
+import android.graphics.Bitmap
 import androidx.annotation.DrawableRes
 import androidx.room.ColumnInfo
 import androidx.room.Entity
@@ -20,14 +21,14 @@ import androidx.room.Ignore
             entity = User::class,
             parentColumns = ["uid"],
             childColumns = ["user_id"],
-            onDelete = ForeignKey.RESTRICT,
+            onDelete = ForeignKey.CASCADE,
-            onUpdate = ForeignKey.RESTRICT
+            onUpdate = ForeignKey.CASCADE
         )
     ]
 )
 data class Book(
     @PrimaryKey(autoGenerate = true)
-    val uid: Int?,
+    val uid: Int = 0,
     @ColumnInfo(name = "title")
     val title: String,
     @ColumnInfo(name = "description")
@@ -35,21 +36,12 @@ data class Book(
     @ColumnInfo(name = "content")
     val content: String,
     @ColumnInfo(name = "cover")
-    @DrawableRes val cover: Int?,
+    val cover: Bitmap?,
     @ColumnInfo(name = "author_id", index = true)
-    val authorId: Int?,
+    val authorId: Int,
     @ColumnInfo(name = "user_id", index = true)
-    val userId: Int?
+    val userId: Int
 ) {
-    @Ignore
-    constructor(
-        title: String,
-        description: String,
-        content: String,
-        cover: Int?,
-        authorId: Int?,
-        userId: Int?
-    ) : this(null, title, description, content, cover, authorId, userId)
 
     override fun equals(other: Any?): Boolean {
         if (this === other) return true

app/src/main/java/com/example/myapplication/db/model/User.kt

@@ -9,7 +9,7 @@ import androidx.room.Index
 @Entity(tableName = "users", indices = [(Index(value = ["login"], unique = true))])
 data class User(
     @PrimaryKey(autoGenerate = true)
-    val uid: Int?,
+    val uid: Int = 0,
     @ColumnInfo(name = "login")
     var login: String,
     @ColumnInfo(name = "password")
@@ -19,13 +19,6 @@ data class User(
     @ColumnInfo(name = "admin")
     var role: String,
 ) {
-    @Ignore
-    constructor(
-        login: String,
-        password: String,
-        email: String,
-        role: String
-    ) : this(null, login, password, email, role)
 
     override fun equals(other: Any?): Boolean {
         if (this === other) return true

app/src/main/java/com/example/myapplication/db/respository/AuthorRepository.kt

@@ -0,0 +1,15 @@
+package com.example.myapplication.db.respository
+
+import androidx.paging.PagingData
+import com.example.myapplication.db.model.Author
+import kotlinx.coroutines.flow.Flow
+
+interface AuthorRepository {
+    suspend fun getAll(): List<Author>
+    suspend fun getAllDrop(): List<Author>
+    suspend fun getByUid(uid: Int): Author
+    fun loadAllAuthorsPaged(): Flow<PagingData<Author>>
+    suspend fun insert(author: Author)
+    suspend fun update(author: Author)
+    suspend fun delete(author: Author)
+}

app/src/main/java/com/example/myapplication/db/respository/BookRepository.kt

@@ -0,0 +1,19 @@
+package com.example.myapplication.db.respository
+
+import androidx.paging.PagingData
+import androidx.paging.PagingSource
+import com.example.myapplication.db.model.Book
+import com.example.myapplication.db.model.BookWithAuthor
+import kotlinx.coroutines.flow.Flow
+
+interface BookRepository {
+    suspend fun getAll(): List<Book>
+    suspend fun getByUid(uid: Int): Book
+    suspend fun getBySearch(searchStr: String): List<Book>
+    fun getByUserId(userId: Int): Flow<List<Book>>
+    fun getByAuthorId(authorId: Int): Flow<List<Book>>
+    fun loadAllBooksPaged(): Flow<PagingData<Book>>
+    suspend fun insert(book: Book)
+    suspend fun update(book: Book)
+    suspend fun delete(book: Book)
+}

app/src/main/java/com/example/myapplication/db/respository/OfflineAuthorRepository.kt

@@ -0,0 +1,29 @@
+package com.example.myapplication.db.respository
+
+import androidx.paging.Pager
+import androidx.paging.PagingConfig
+import androidx.paging.PagingData
+import androidx.paging.PagingSource
+import com.example.myapplication.db.database.AppContainer
+import com.example.myapplication.db.dao.AuthorDao
+import com.example.myapplication.db.model.Author
+import kotlinx.coroutines.flow.Flow
+
+class OfflineAuthorRepository(private val authorDao: AuthorDao) : AuthorRepository {
+    override suspend fun getAll(): List<Author> = authorDao.getAll()
+    override suspend fun getAllDrop(): List<Author> = authorDao.getAllDrop()
+    override suspend fun getByUid(uid: Int): Author = authorDao.getByUid(uid)
+    override fun loadAllAuthorsPaged(): Flow<PagingData<Author>> = Pager(
+        config = PagingConfig(
+            pageSize = AppContainer.LIMIT,
+            enablePlaceholders = false
+        ),
+        pagingSourceFactory = authorDao::loadAllAuthorsPaged
+    ).flow
+    fun loadAuthorsPaged(): PagingSource<Int, Author> = authorDao.loadAllAuthorsPaged()
+    override suspend fun insert(author: Author) = authorDao.insert(author)
+
+    override suspend fun update(author: Author) = authorDao.update(author)
+
+    override suspend fun delete(author: Author) = authorDao.delete(author)
+}

app/src/main/java/com/example/myapplication/db/respository/OfflineBookRepository.kt

@@ -0,0 +1,35 @@
+package com.example.myapplication.db.respository
+
+import androidx.paging.Pager
+import androidx.paging.PagingConfig
+import androidx.paging.PagingData
+import androidx.paging.PagingSource
+import com.example.myapplication.db.database.AppContainer
+import com.example.myapplication.db.dao.BookDao
+import com.example.myapplication.db.model.Book
+import com.example.myapplication.db.model.BookWithAuthor
+import kotlinx.coroutines.flow.Flow
+
+class OfflineBookRepository(private val bookDao: BookDao) : BookRepository {
+    override suspend fun getAll(): List<Book> = bookDao.getAll()
+
+    override suspend fun getByUid(uid: Int): Book = bookDao.getByUid(uid)
+
+    override suspend fun getBySearch(searchStr: String): List<Book> = bookDao.getBySearch(searchStr)
+
+    override fun getByUserId(userId: Int): Flow<List<Book>> = bookDao.getByUserId(userId)
+    override fun getByAuthorId(authorId: Int): Flow<List<Book>> = bookDao.getByAuthorId(authorId)
+    override fun loadAllBooksPaged(): Flow<PagingData<Book>> = Pager(
+        config = PagingConfig(
+            pageSize = AppContainer.LIMIT,
+            enablePlaceholders = false
+        ),
+        pagingSourceFactory = bookDao::loadAllBooksPaged
+    ).flow
+    fun loadBooksPaged(): PagingSource<Int, Book> = bookDao.loadAllBooksPaged()
+    override suspend fun insert(book: Book) = bookDao.insert(book)
+
+    override suspend fun update(book: Book) = bookDao.update(book)
+
+    override suspend fun delete(book: Book) = bookDao.delete(book)
+}

app/src/main/java/com/example/myapplication/db/respository/OfflineUserRepository.kt

@@ -0,0 +1,22 @@
+package com.example.myapplication.db.respository
+
+import com.example.myapplication.db.dao.UserDao;
+import com.example.myapplication.db.model.User;
+import com.example.myapplication.db.model.Book;
+import kotlinx.coroutines.flow.Flow
+
+class OfflineUserRepository(private val userDao: UserDao) : UserRepository {
+    override fun getAll(): Flow<List<User>> = userDao.getAll()
+
+    override suspend fun getByUid(uid: Int): User = userDao.getByUid(uid)
+
+    override fun getUserBooks(userid: Int): Flow<List<Book>> = userDao.getUserBooks(userid)
+
+    override suspend fun tryLogin(login: String, password: String): User? = userDao.tryLogin(login, password)
+
+    override suspend fun insert(user: User) = userDao.insert(user)
+
+    override suspend fun update(user: User) = userDao.update(user)
+
+    override suspend fun delete(user: User) = userDao.delete(user)
+}

app/src/main/java/com/example/myapplication/db/respository/UserRepository.kt

@@ -0,0 +1,14 @@
+package com.example.myapplication.db.respository
+
+import com.example.myapplication.db.model.User;
+import com.example.myapplication.db.model.Book;
+import kotlinx.coroutines.flow.Flow
+interface UserRepository {
+    fun getAll(): Flow<List<User>>
+    suspend fun getByUid(uid: Int): User
+    fun getUserBooks(userid: Int): Flow<List<Book>>
+    suspend fun tryLogin(login: String, password: String): User?
+    suspend fun insert(user: User)
+    suspend fun update(user: User)
+    suspend fun delete(user: User)
+}

app/src/main/java/com/example/myapplication/ui/theme/Theme.kt

@@ -17,9 +17,9 @@ import androidx.compose.ui.platform.LocalView
 import androidx.core.view.WindowCompat
 
 private val DarkColorScheme = darkColorScheme(
-        primary = Purple80,
+    primary = Green,
-        secondary = PurpleGrey80,
+    secondary = Grey,
-        tertiary = Pink80
+    tertiary = Pink40,
 )
 
 private val LightColorScheme = lightColorScheme(