diff --git a/Server/data.json b/Server/data.json
new file mode 100644
index 0000000..91848f4
--- /dev/null
+++ b/Server/data.json
@@ -0,0 +1,1642 @@
+{
+  "users": [
+    {
+      "login": "Admin",
+      "password": "Admin",
+      "email": "admin@mail.ru",
+      "role": "ADMIN",
+      "id": 1
+    },
+    {
+      "id": 2,
+      "login": "User1",
+      "password": "123",
+      "email": "user1@mail.ru",
+      "role": "USER"
+    }
+  ],
+  "authors": [
+    {
+      "name": "Дж. Оруэлл",
+      "id": 1
+    },
+    {
+      "name": "М.А. Булгаков",
+      "id": 2
+    },
+    {
+      "name": "Р. Брэдбери",
+      "id": 3
+    }
+  ],
+  "books": [
+    {
+      "title": "книга",
+      "description": "тест",
+      "content": "книга о приключениях",
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new file mode 100644
index 0000000..0203f7f
--- /dev/null
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+      "resolved": "https://registry.npmjs.org/steno/-/steno-0.4.4.tgz",
+      "integrity": "sha512-EEHMVYHNXFHfGtgjNITnka0aHhiAlo93F7z2/Pwd+g0teG9CnM3JIINM7hVVB5/rhw9voufD7Wukwgtw2uqh6w==",
+      "dev": true,
+      "dependencies": {
+        "graceful-fs": "^4.1.3"
+      }
+    },
+    "node_modules/string-width": {
+      "version": "4.2.3",
+      "resolved": "https://registry.npmjs.org/string-width/-/string-width-4.2.3.tgz",
+      "integrity": "sha512-wKyQRQpjJ0sIp62ErSZdGsjMJWsap5oRNihHhu6G7JVO/9jIB6UyevL+tXuOqrng8j/cxKTWyWUwvSTriiZz/g==",
+      "dev": true,
+      "dependencies": {
+        "emoji-regex": "^8.0.0",
+        "is-fullwidth-code-point": "^3.0.0",
+        "strip-ansi": "^6.0.1"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/strip-ansi": {
+      "version": "6.0.1",
+      "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-6.0.1.tgz",
+      "integrity": "sha512-Y38VPSHcqkFrCpFnQ9vuSXmquuv5oXOKpGeT6aGrr3o3Gc9AlVa6JBfUSOCnbxGGZF+/0ooI7KrPuUSztUdU5A==",
+      "dev": true,
+      "dependencies": {
+        "ansi-regex": "^5.0.1"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/supports-color": {
+      "version": "7.2.0",
+      "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-7.2.0.tgz",
+      "integrity": "sha512-qpCAvRl9stuOHveKsn7HncJRvv501qIacKzQlO/+Lwxc9+0q2wLyv4Dfvt80/DPn2pqOBsJdDiogXGR9+OvwRw==",
+      "dev": true,
+      "dependencies": {
+        "has-flag": "^4.0.0"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/toidentifier": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/toidentifier/-/toidentifier-1.0.1.tgz",
+      "integrity": "sha512-o5sSPKEkg/DIQNmH43V0/uerLrpzVedkUh8tGNvaeXpfpuwjKenlSox/2O/BTlZUtEe+JG7s5YhEz608PlAHRA==",
+      "dev": true,
+      "engines": {
+        "node": ">=0.6"
+      }
+    },
+    "node_modules/type-is": {
+      "version": "1.6.18",
+      "resolved": "https://registry.npmjs.org/type-is/-/type-is-1.6.18.tgz",
+      "integrity": "sha512-TkRKr9sUTxEH8MdfuCSP7VizJyzRNMjj2J2do2Jr3Kym598JVdEksuzPQCnlFPW4ky9Q+iA+ma9BGm06XQBy8g==",
+      "dev": true,
+      "dependencies": {
+        "media-typer": "0.3.0",
+        "mime-types": "~2.1.24"
+      },
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
+    "node_modules/unpipe": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/unpipe/-/unpipe-1.0.0.tgz",
+      "integrity": "sha512-pjy2bYhSsufwWlKwPc+l3cN7+wuJlK6uz0YdJEOlQDbl6jo/YlPi4mb8agUkVC8BF7V8NuzeyPNqRksA3hztKQ==",
+      "dev": true,
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
+    "node_modules/utils-merge": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/utils-merge/-/utils-merge-1.0.1.tgz",
+      "integrity": "sha512-pMZTvIkT1d+TFGvDOqodOclx0QWkkgi6Tdoa8gC8ffGAAqz9pzPTZWAybbsHHoED/ztMtkv/VoYTYyShUn81hA==",
+      "dev": true,
+      "engines": {
+        "node": ">= 0.4.0"
+      }
+    },
+    "node_modules/vary": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
+      "integrity": "sha512-BNGbWLfd0eUPabhkXUVm0j8uuvREyTh5ovRa/dyow/BqAbZJyC+5fU+IzQOzmAKzYqYRAISoRhdQr3eIZ/PXqg==",
+      "dev": true,
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
+    "node_modules/wrap-ansi": {
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-7.0.0.tgz",
+      "integrity": "sha512-YVGIj2kamLSTxw6NsZjoBxfSwsn0ycdesmc4p+Q21c5zPuZ1pl+NfxVdxPtdHvmNVOQ6XSYG4AUtyt/Fi7D16Q==",
+      "dev": true,
+      "dependencies": {
+        "ansi-styles": "^4.0.0",
+        "string-width": "^4.1.0",
+        "strip-ansi": "^6.0.0"
+      },
+      "engines": {
+        "node": ">=10"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/wrap-ansi?sponsor=1"
+      }
+    },
+    "node_modules/y18n": {
+      "version": "5.0.8",
+      "resolved": "https://registry.npmjs.org/y18n/-/y18n-5.0.8.tgz",
+      "integrity": "sha512-0pfFzegeDWJHJIAmTLRP2DwHjdF5s7jo9tuztdQxAhINCdvS+3nGINqPd00AphqJR/0LhANUS6/+7SCb98YOfA==",
+      "dev": true,
+      "engines": {
+        "node": ">=10"
+      }
+    },
+    "node_modules/yargs": {
+      "version": "17.7.2",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-17.7.2.tgz",
+      "integrity": "sha512-7dSzzRQ++CKnNI/krKnYRV7JKKPUXMEh61soaHKg9mrWEhzFWhFnxPxGl+69cD1Ou63C13NUPCnmIcrvqCuM6w==",
+      "dev": true,
+      "dependencies": {
+        "cliui": "^8.0.1",
+        "escalade": "^3.1.1",
+        "get-caller-file": "^2.0.5",
+        "require-directory": "^2.1.1",
+        "string-width": "^4.2.3",
+        "y18n": "^5.0.5",
+        "yargs-parser": "^21.1.1"
+      },
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/yargs-parser": {
+      "version": "21.1.1",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-21.1.1.tgz",
+      "integrity": "sha512-tVpsJW7DdjecAiFpbIB1e3qxIQsE6NoPc5/eTdrbbIC4h0LVsWhnoa3g+m2HclBIujHzsxZ4VJVA+GUuc2/LBw==",
+      "dev": true,
+      "engines": {
+        "node": ">=12"
+      }
+    }
+  }
+}
diff --git a/Server/package.json b/Server/package.json
new file mode 100644
index 0000000..0fb3100
--- /dev/null
+++ b/Server/package.json
@@ -0,0 +1,12 @@
+{
+  "name": "fake-db",
+  "version": "1.0.0",
+  "scripts": {
+    "start": "json-server --watch data.json --host 0.0.0.0 -p 8079"
+  },
+  "dependencies": {
+  },
+  "devDependencies": {
+    "json-server": "0.17.4"
+  }
+}
\ No newline at end of file
diff --git a/app/build.gradle.kts b/app/build.gradle.kts
index 09d332d..07b9bb9 100644
--- a/app/build.gradle.kts
+++ b/app/build.gradle.kts
@@ -2,6 +2,7 @@ plugins {
     id("com.android.application")
     id("org.jetbrains.kotlin.android")
     id("com.google.devtools.ksp")
+    id("org.jetbrains.kotlin.plugin.serialization")
 }
 
 android {
@@ -59,6 +60,8 @@ dependencies {
     implementation("androidx.compose.ui:ui-tooling-preview")
     implementation("androidx.compose.material3:material3")
 
+
+    implementation("dev.materii.pullrefresh:pullrefresh:1.0.0")
     val room_version = "2.5.2"
     implementation("androidx.room:room-runtime:$room_version")
     annotationProcessor("androidx.room:room-compiler:$room_version")
@@ -78,4 +81,14 @@ dependencies {
     val paging_version = "3.2.0-rc01"
     implementation("androidx.paging:paging-runtime:$paging_version")
     implementation("androidx.paging:paging-compose:$paging_version")
+
+    // retrofit
+    val retrofitVersion = "2.9.0"
+    implementation("com.squareup.retrofit2:retrofit:$retrofitVersion")
+    implementation("com.squareup.okhttp3:logging-interceptor:4.11.0")
+    implementation("org.jetbrains.kotlinx:kotlinx-serialization-json:1.5.1")
+    implementation("com.jakewharton.retrofit:retrofit2-kotlinx-serialization-converter:1.0.0")
+
+    // LiveData | +
+    implementation("androidx.compose.runtime:runtime-livedata:1.5.4")
 }
\ No newline at end of file
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 36e417c..51c293d 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -2,6 +2,8 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools">
 
+    <uses-permission android:name="android.permission.INTERNET"/>
+
     <application
         android:name=".MyApplication"
         android:allowBackup="true"
@@ -12,8 +14,11 @@
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
         android:theme="@style/Theme.MyApplication"
-        tools:targetApi="31">
+        tools:targetApi="31"
+        android:networkSecurityConfig="@xml/network_security_config"
+        android:vmSafeMode="true">
         <activity
+            android:screenOrientation="portrait"
             android:name=".MainActivity"
             android:exported="true"
             android:label="@string/app_name"
diff --git a/app/src/main/java/com/example/myapplication/api/ServerService.kt b/app/src/main/java/com/example/myapplication/api/ServerService.kt
new file mode 100644
index 0000000..5183f8d
--- /dev/null
+++ b/app/src/main/java/com/example/myapplication/api/ServerService.kt
@@ -0,0 +1,143 @@
+package com.example.myapplication.api
+
+import com.jakewharton.retrofit2.converter.kotlinx.serialization.asConverterFactory
+import com.example.myapplication.api.model.AuthorRemote
+import com.example.myapplication.api.model.BookRemote
+import com.example.myapplication.api.model.UserRemote
+import kotlinx.serialization.json.Json
+import okhttp3.MediaType.Companion.toMediaType
+import okhttp3.OkHttpClient
+import okhttp3.logging.HttpLoggingInterceptor
+import retrofit2.Retrofit
+import retrofit2.http.Body
+import retrofit2.http.DELETE
+import retrofit2.http.GET
+import retrofit2.http.POST
+import retrofit2.http.PUT
+import retrofit2.http.Path
+import retrofit2.http.Query
+
+interface ServerService{
+    @GET("books")
+    suspend fun getBooks(): List<BookRemote>
+
+    @GET("books/{id}")
+    suspend fun getBook(
+        @Path("id") id: Int,
+    ): BookRemote
+
+    @GET("search")
+    suspend fun getBySearch(
+        @Query("title") searchStr: String,
+    ): List<BookRemote>
+
+    @GET("books")
+    suspend fun getByAuthor(
+        @Query("authorId") auth: Int,
+    ): List<BookRemote>
+
+    @GET("books")
+    suspend fun getByUser(
+        @Query("userId") user: Int,
+    ): List<BookRemote>
+
+    @GET("books")
+    suspend fun getBooks(
+        @Query("_page") page: Int,
+        @Query("_limit") limit: Int,
+    ): List<BookRemote>
+
+    @POST("books")
+    suspend fun createBook(
+        @Body book: BookRemote,
+    ): BookRemote
+
+    @PUT("books/{id}")
+    suspend fun updateBook(
+        @Path("id") id: Int,
+        @Body book: BookRemote,
+    ): BookRemote
+
+    @DELETE("books/{id}")
+    suspend fun deleteBook(
+        @Path("id") id: Int,
+    ): BookRemote
+
+    @GET("authors")
+    suspend fun getAuthors(): List<AuthorRemote>
+    @GET("authors")
+    suspend fun getAuthors(
+        @Query("_page") page: Int,
+        @Query("_limit") limit: Int,
+    ): List<AuthorRemote>
+    @GET("authors/{id}")
+    suspend fun getAuthor(
+        @Path("id") id: Int,
+    ): AuthorRemote
+    @POST("authors")
+    suspend fun createAuthor(
+        @Body author: AuthorRemote,
+    ): AuthorRemote
+
+    @PUT("authors/{id}")
+    suspend fun updateAuthor(
+        @Path("id") id: Int,
+        @Body author: AuthorRemote,
+    ): AuthorRemote
+
+    @DELETE("authors/{id}")
+    suspend fun deleteAuthor(
+        @Path("id") id: Int,
+    ): AuthorRemote
+
+    @GET("users")
+    suspend fun getUsers(): List<UserRemote>
+    @GET("users/{id}")
+    suspend fun getUser(
+        @Path("id") id: Int,
+    ): UserRemote
+    @GET("users")
+    suspend fun getUserByLoginPass(
+        @Query("login") login: String,
+        @Query("password") password: String
+    ): UserRemote
+    @POST("users")
+    suspend fun createUser(
+        @Body user: UserRemote,
+    ): UserRemote
+
+    @PUT("users/{id}")
+    suspend fun updateUser(
+        @Path("id") id: Int,
+        @Body user: UserRemote,
+    ): UserRemote
+
+    @DELETE("users/{id}")
+    suspend fun deleteUser(
+        @Path("id") id: Int,
+    ): UserRemote
+    companion object {
+        private const val BASE_URL = "http://100.87.48.148:8079/"
+
+        @Volatile
+        private var INSTANCE: ServerService? = null
+
+        fun getInstance(): ServerService {
+            return INSTANCE ?: synchronized(this) {
+                val logger = HttpLoggingInterceptor()
+                logger.level = HttpLoggingInterceptor.Level.BASIC
+                val client = OkHttpClient.Builder()
+                    .addInterceptor(logger)
+                    .build()
+                val json = Json { ignoreUnknownKeys = true } // Создаем экземпляр Json с ignoreUnknownKeys = true
+                return Retrofit.Builder()
+                    .baseUrl(BASE_URL)
+                    .client(client)
+                    .addConverterFactory(json.asConverterFactory("application/json".toMediaType())) // Применяем конфигурацию Json
+                    .build()
+                    .create(ServerService::class.java)
+                    .also { INSTANCE = it }
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/com/example/myapplication/api/model/AuthorRemote.kt b/app/src/main/java/com/example/myapplication/api/model/AuthorRemote.kt
new file mode 100644
index 0000000..63200e2
--- /dev/null
+++ b/app/src/main/java/com/example/myapplication/api/model/AuthorRemote.kt
@@ -0,0 +1,38 @@
+package com.example.myapplication.api.model
+
+import com.example.myapplication.db.model.Author
+import kotlinx.serialization.Serializable
+
+@Serializable
+data class AuthorRemote(
+    val id: Int = 0,
+    val name: String = "",
+){
+    override fun equals(other: Any?): Boolean {
+        if (this === other) return true
+        if (javaClass != other?.javaClass) return false
+
+        other as AuthorRemote
+
+        if (id != other.id) return false
+        if (name != other.name) return false
+
+        return true
+    }
+
+    override fun hashCode(): Int {
+        var result = id
+        result = 31 * result + name.hashCode()
+        return result
+    }
+}
+
+fun AuthorRemote.toAuthor(): Author = Author(
+    id,
+    name
+)
+
+fun Author.toAuthorRemote(): AuthorRemote = AuthorRemote(
+    id,
+    name
+)
\ No newline at end of file
diff --git a/app/src/main/java/com/example/myapplication/api/model/BookRemote.kt b/app/src/main/java/com/example/myapplication/api/model/BookRemote.kt
new file mode 100644
index 0000000..1eb497a
--- /dev/null
+++ b/app/src/main/java/com/example/myapplication/api/model/BookRemote.kt
@@ -0,0 +1,68 @@
+package com.example.myapplication.api.model
+
+import com.example.myapplication.db.database.Converters
+import com.example.myapplication.db.model.Book
+import kotlinx.serialization.Serializable
+
+private val __converters = Converters()
+@Serializable
+data class BookRemote(
+    val id: Int = 0,
+    val title: String = "",
+    val description: String = "",
+    val content: String = "",
+    val cover: ByteArray? = null,
+    val authorId: Int = 0,
+    val userId: Int = 0
+){
+    override fun equals(other: Any?): Boolean {
+        if (this === other) return true
+        if (javaClass != other?.javaClass) return false
+
+        other as BookRemote
+
+        if (id != other.id) return false
+        if (title != other.title) return false
+        if (description != other.description) return false
+        if (content != other.content) return false
+        if (cover != null) {
+            if (other.cover == null) return false
+            if (!cover.contentEquals(other.cover)) return false
+        } else if (other.cover != null) return false
+        if (authorId != other.authorId) return false
+        if (userId != other.userId) return false
+
+        return true
+    }
+
+    override fun hashCode(): Int {
+        var result = id
+        result = 31 * result + title.hashCode()
+        result = 31 * result + description.hashCode()
+        result = 31 * result + content.hashCode()
+        result = 31 * result + (cover?.contentHashCode() ?: 0)
+        result = 31 * result + authorId
+        result = 31 * result + userId
+        return result
+    }
+}
+
+fun BookRemote.toBook(): Book = Book(
+    id,
+    title,
+    description,
+    content,
+    cover?.let { __converters.toBitmap(it) },
+    authorId,
+    userId
+)
+
+fun Book.toBookRemote(): BookRemote = BookRemote(
+    id,
+    title,
+    description,
+    content,
+    cover?.let { __converters.fromBitmap(it) },
+    authorId,
+    userId
+)
\ No newline at end of file
diff --git a/app/src/main/java/com/example/myapplication/api/model/UserRemote.kt b/app/src/main/java/com/example/myapplication/api/model/UserRemote.kt
new file mode 100644
index 0000000..dd47587
--- /dev/null
+++ b/app/src/main/java/com/example/myapplication/api/model/UserRemote.kt
@@ -0,0 +1,54 @@
+package com.example.myapplication.api.model
+
+import com.example.myapplication.db.model.User
+import kotlinx.serialization.Serializable
+
+@Serializable
+data class UserRemote(
+    val id: Int = 0,
+    val login: String = "",
+    val password: String = "",
+    val email: String = "",
+    val role: String = ""
+){
+    override fun equals(other: Any?): Boolean {
+        if (this === other) return true
+        if (javaClass != other?.javaClass) return false
+
+        other as UserRemote
+
+        if (id != other.id) return false
+        if (login != other.login) return false
+        if (password != other.password) return false
+        if (email != other.email) return false
+        if (role != other.role) return false
+
+        return true
+    }
+
+    override fun hashCode(): Int {
+        var result = id
+        result = 31 * result + login.hashCode()
+        result = 31 * result + password.hashCode()
+        result = 31 * result + email.hashCode()
+        result = 31 * result + role.hashCode()
+
+        return result
+    }
+}
+
+fun UserRemote.toUser(): User = User(
+    id,
+    login,
+    password,
+    email,
+    role
+)
+
+fun User.toUserRemote(): UserRemote = UserRemote(
+    uid,
+    login,
+    password,
+    email,
+    role
+)
\ No newline at end of file
diff --git a/app/src/main/java/com/example/myapplication/api/respositories/Mediator/AuthorRemoteMediator.kt b/app/src/main/java/com/example/myapplication/api/respositories/Mediator/AuthorRemoteMediator.kt
new file mode 100644
index 0000000..50bfcf8
--- /dev/null
+++ b/app/src/main/java/com/example/myapplication/api/respositories/Mediator/AuthorRemoteMediator.kt
@@ -0,0 +1,107 @@
+package com.example.myapplication.api.respositories.Mediator
+
+import android.util.Log
+import androidx.paging.ExperimentalPagingApi
+import androidx.paging.LoadType
+import androidx.paging.PagingState
+import androidx.paging.RemoteMediator
+import androidx.room.withTransaction
+import com.example.myapplication.api.ServerService
+import com.example.myapplication.api.model.toAuthor
+import com.example.myapplication.db.database.AppDatabase
+import com.example.myapplication.db.model.Author
+import com.example.myapplication.db.model.RemoteKeyType
+import com.example.myapplication.db.model.RemoteKeys
+import com.example.myapplication.db.respository.OfflineAuthorRepository
+import com.example.myapplication.db.respository.OfflineBookRepository
+import com.example.myapplication.db.respository.OfflineRemoteKeyRepository
+import retrofit2.HttpException
+import java.io.IOException
+@OptIn(ExperimentalPagingApi::class)
+class AuthorRemoteMediator(
+    private val service: ServerService,
+    private val dbAuthorRepository: OfflineAuthorRepository,
+    private val dbRemoteKeyRepository: OfflineRemoteKeyRepository,
+    private val database: AppDatabase
+): RemoteMediator<Int, Author>() {
+    override suspend fun initialize(): RemoteMediator.InitializeAction {
+        return RemoteMediator.InitializeAction.LAUNCH_INITIAL_REFRESH
+    }
+
+    override suspend fun load(
+        loadType: LoadType,
+        state: PagingState<Int, Author>
+    ): RemoteMediator.MediatorResult {
+        val page = when (loadType) {
+            LoadType.REFRESH -> {
+                val remoteKeys = getRemoteKeyClosestToCurrentPosition(state)
+                remoteKeys?.nextKey?.minus(1) ?: 1
+            }
+
+            LoadType.PREPEND -> {
+                val remoteKeys = getRemoteKeyForFirstItem(state)
+                remoteKeys?.prevKey
+                    ?: return RemoteMediator.MediatorResult.Success(endOfPaginationReached = remoteKeys != null)
+            }
+
+            LoadType.APPEND -> {
+                val remoteKeys = getRemoteKeyForLastItem(state)
+                remoteKeys?.nextKey
+                    ?: return RemoteMediator.MediatorResult.Success(endOfPaginationReached = remoteKeys != null)
+            }
+        }
+
+        try {
+            val authors = service.getAuthors(page, state.config.pageSize).map{it.toAuthor()}
+            Log.i("Authors info", authors.toString())
+            val endOfPaginationReached = authors.isEmpty()
+            database.withTransaction {
+                if (loadType == LoadType.REFRESH) {
+                    dbRemoteKeyRepository.deleteRemoteKey(RemoteKeyType.AUTHOR)
+                    dbAuthorRepository.clearAll()
+                }
+                val prevKey = if (page == 1) null else page - 1
+                val nextKey = if (endOfPaginationReached) null else page + 1
+                val keys = authors.map {
+                    RemoteKeys(
+                        entityId = it.id,
+                        type = RemoteKeyType.AUTHOR,
+                        prevKey = prevKey,
+                        nextKey = nextKey
+                    )
+                }
+                dbRemoteKeyRepository.createRemoteKeys(keys)
+                dbAuthorRepository.insertAuthors(authors)
+            }
+            return RemoteMediator.MediatorResult.Success(endOfPaginationReached = endOfPaginationReached)
+        } catch (exception: IOException) {
+            return RemoteMediator.MediatorResult.Error(exception)
+        } catch (exception: HttpException) {
+            return RemoteMediator.MediatorResult.Error(exception)
+        }
+    }
+
+    private suspend fun getRemoteKeyForLastItem(state: PagingState<Int, Author>): RemoteKeys? {
+        return state.pages.lastOrNull { it.data.isNotEmpty() }?.data?.lastOrNull()
+            ?.let { author ->
+                dbRemoteKeyRepository.getAllRemoteKeys(author.id, RemoteKeyType.AUTHOR)
+            }
+    }
+
+    private suspend fun getRemoteKeyForFirstItem(state: PagingState<Int, Author>): RemoteKeys? {
+        return state.pages.firstOrNull { it.data.isNotEmpty() }?.data?.firstOrNull()
+            ?.let { author ->
+                dbRemoteKeyRepository.getAllRemoteKeys(author.id, RemoteKeyType.AUTHOR)
+            }
+    }
+
+    private suspend fun getRemoteKeyClosestToCurrentPosition(
+        state: PagingState<Int, Author>
+    ): RemoteKeys? {
+        return state.anchorPosition?.let { position ->
+            state.closestItemToPosition(position)?.id?.let { authorUid ->
+                dbRemoteKeyRepository.getAllRemoteKeys(authorUid, RemoteKeyType.AUTHOR)
+            }
+        }
+    }
+}
diff --git a/app/src/main/java/com/example/myapplication/api/respositories/Mediator/BookRemoteMediator.kt b/app/src/main/java/com/example/myapplication/api/respositories/Mediator/BookRemoteMediator.kt
new file mode 100644
index 0000000..284051c
--- /dev/null
+++ b/app/src/main/java/com/example/myapplication/api/respositories/Mediator/BookRemoteMediator.kt
@@ -0,0 +1,110 @@
+package com.example.myapplication.api.respositories.Mediator
+
+import android.util.Log
+import androidx.paging.ExperimentalPagingApi
+import androidx.paging.LoadType
+import androidx.paging.PagingState
+import androidx.paging.RemoteMediator
+import androidx.room.withTransaction
+import com.example.myapplication.api.ServerService
+import com.example.myapplication.api.model.toBook
+import com.example.myapplication.api.respositories.RestAuthorRepository
+import com.example.myapplication.db.database.AppDatabase
+import com.example.myapplication.db.model.Book
+import com.example.myapplication.db.model.RemoteKeyType
+import com.example.myapplication.db.model.RemoteKeys
+import com.example.myapplication.db.respository.OfflineBookRepository
+import com.example.myapplication.db.respository.OfflineRemoteKeyRepository
+import retrofit2.HttpException
+import java.io.IOException
+
+@OptIn(ExperimentalPagingApi::class)
+class BookRemoteMediator(
+    private val service: ServerService,
+    private val dbBookRepository: OfflineBookRepository,
+    private val dbRemoteKeyRepository: OfflineRemoteKeyRepository,
+    private val authorRestRepository: RestAuthorRepository,
+    private val database: AppDatabase
+) : RemoteMediator<Int, Book>() {
+    override suspend fun initialize(): InitializeAction {
+        return InitializeAction.LAUNCH_INITIAL_REFRESH
+    }
+
+    override suspend fun load(
+        loadType: LoadType,
+        state: PagingState<Int, Book>
+    ): MediatorResult {
+        val page = when (loadType) {
+            LoadType.REFRESH -> {
+                val remoteKeys = getRemoteKeyClosestToCurrentPosition(state)
+                remoteKeys?.nextKey?.minus(1) ?: 1
+            }
+
+            LoadType.PREPEND -> {
+                val remoteKeys = getRemoteKeyForFirstItem(state)
+                remoteKeys?.prevKey
+                    ?: return MediatorResult.Success(endOfPaginationReached = remoteKeys != null)
+            }
+
+            LoadType.APPEND -> {
+                val remoteKeys = getRemoteKeyForLastItem(state)
+                remoteKeys?.nextKey
+                    ?: return MediatorResult.Success(endOfPaginationReached = remoteKeys != null)
+            }
+        }
+
+        try {
+            val books = service.getBooks(page, state.config.pageSize).map { it.toBook() }
+            Log.i("Books info", books.toString())
+            val endOfPaginationReached = books.isEmpty()
+            database.withTransaction {
+                if (loadType == LoadType.REFRESH) {
+                    dbRemoteKeyRepository.deleteRemoteKey(RemoteKeyType.BOOK)
+                    dbBookRepository.clearAll()
+                }
+                val prevKey = if (page == 1) null else page - 1
+                val nextKey = if (endOfPaginationReached) null else page + 1
+                val keys = books.map {
+                    RemoteKeys(
+                        entityId = it.id,
+                        type = RemoteKeyType.BOOK,
+                        prevKey = prevKey,
+                        nextKey = nextKey
+                    )
+                }
+                authorRestRepository.getAll()
+                dbRemoteKeyRepository.createRemoteKeys(keys)
+                dbBookRepository.insertBooks(books)
+            }
+            return MediatorResult.Success(endOfPaginationReached = endOfPaginationReached)
+        } catch (exception: IOException) {
+            return MediatorResult.Error(exception)
+        } catch (exception: HttpException) {
+            return MediatorResult.Error(exception)
+        }
+    }
+
+    private suspend fun getRemoteKeyForLastItem(state: PagingState<Int, Book>): RemoteKeys? {
+        return state.pages.lastOrNull { it.data.isNotEmpty() }?.data?.lastOrNull()
+            ?.let { book ->
+                dbRemoteKeyRepository.getAllRemoteKeys(book.id, RemoteKeyType.BOOK)
+            }
+    }
+
+    private suspend fun getRemoteKeyForFirstItem(state: PagingState<Int, Book>): RemoteKeys? {
+        return state.pages.firstOrNull { it.data.isNotEmpty() }?.data?.firstOrNull()
+            ?.let { book ->
+                dbRemoteKeyRepository.getAllRemoteKeys(book.id, RemoteKeyType.BOOK)
+            }
+    }
+
+    private suspend fun getRemoteKeyClosestToCurrentPosition(
+        state: PagingState<Int, Book>
+    ): RemoteKeys? {
+        return state.anchorPosition?.let { position ->
+            state.closestItemToPosition(position)?.id?.let { bookUid ->
+                dbRemoteKeyRepository.getAllRemoteKeys(bookUid, RemoteKeyType.BOOK)
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/com/example/myapplication/api/respositories/RestAuthorRepository.kt b/app/src/main/java/com/example/myapplication/api/respositories/RestAuthorRepository.kt
new file mode 100644
index 0000000..1742166
--- /dev/null
+++ b/app/src/main/java/com/example/myapplication/api/respositories/RestAuthorRepository.kt
@@ -0,0 +1,72 @@
+package com.example.myapplication.api.respositories
+
+import android.util.Log
+import androidx.paging.ExperimentalPagingApi
+import androidx.paging.Pager
+import androidx.paging.PagingConfig
+import androidx.paging.PagingData
+import com.example.myapplication.api.ServerService
+import com.example.myapplication.db.database.AppDatabase
+import com.example.myapplication.db.database.AppContainer
+import com.example.myapplication.db.respository.OfflineAuthorRepository
+import com.example.myapplication.db.respository.OfflineRemoteKeyRepository
+import com.example.myapplication.db.respository.AuthorRepository
+import com.example.myapplication.api.model.toAuthor
+import com.example.myapplication.api.model.toAuthorRemote
+import com.example.myapplication.db.model.Author
+import com.example.myapplication.api.respositories.Mediator.AuthorRemoteMediator
+import kotlinx.coroutines.flow.Flow
+
+class RestAuthorRepository(
+    private val service: ServerService,
+    private val dbAuthorRepository: OfflineAuthorRepository,
+    private val dbRemoteKeyRepository: OfflineRemoteKeyRepository,
+    private val database: AppDatabase
+): AuthorRepository {
+    override suspend fun getAll(): List<Author> {
+        return service.getAuthors().map{x -> x.toAuthor()}
+    }
+
+    override suspend fun getAllDrop(): List<Author> {
+        return service.getAuthors().map{x -> x.toAuthor()}
+    }
+
+    override suspend fun getByUid(uid: Int): Author {
+        return service.getAuthor(uid).toAuthor()
+    }
+
+    override suspend fun insertAuthor(author: Author) {
+        dbAuthorRepository.insertAuthor(service.createAuthor(author.toAuthorRemote()).toAuthor())
+    }
+
+    override suspend fun updateAuthor(author: Author) {
+        service.updateAuthor(author.id, author.toAuthorRemote())
+        dbAuthorRepository.updateAuthor(author)
+    }
+
+    override suspend fun deleteAuthor(author: Author) {
+        service.deleteAuthor(author.id)
+        dbAuthorRepository.deleteAuthor(author)
+    }
+
+    override fun loadAllAuthorsPaged(): Flow<PagingData<Author>> {
+        Log.d(RestAuthorRepository::class.simpleName, "Get authors")
+
+        val pagingSourceFactory = { dbAuthorRepository.loadAuthorsPaged() }
+
+        @OptIn(ExperimentalPagingApi::class)
+        return Pager(
+            config = PagingConfig(
+                pageSize = AppContainer.LIMIT,
+                enablePlaceholders = false
+            ),
+            remoteMediator = AuthorRemoteMediator(
+                service,
+                dbAuthorRepository,
+                dbRemoteKeyRepository,
+                database,
+            ),
+            pagingSourceFactory = pagingSourceFactory
+        ).flow
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/com/example/myapplication/api/respositories/RestBookRepository.kt b/app/src/main/java/com/example/myapplication/api/respositories/RestBookRepository.kt
new file mode 100644
index 0000000..a0f003d
--- /dev/null
+++ b/app/src/main/java/com/example/myapplication/api/respositories/RestBookRepository.kt
@@ -0,0 +1,84 @@
+package com.example.myapplication.api.respositories
+
+import android.util.Log
+import androidx.paging.ExperimentalPagingApi
+import androidx.paging.Pager
+import androidx.paging.PagingConfig
+import androidx.paging.PagingData
+import com.example.myapplication.api.ServerService
+import com.example.myapplication.db.respository.OfflineBookRepository
+import com.example.myapplication.db.respository.OfflineRemoteKeyRepository
+import com.example.myapplication.db.database.AppDatabase
+import com.example.myapplication.db.respository.BookRepository
+import com.example.myapplication.api.model.toBook
+import com.example.myapplication.api.model.toBookRemote
+import com.example.myapplication.api.respositories.Mediator.BookRemoteMediator
+import com.example.myapplication.db.database.AppContainer
+import com.example.myapplication.db.model.Book
+import kotlinx.coroutines.flow.Flow
+
+class RestBookRepository(
+    private val service: ServerService,
+    private val dbBookRepository: OfflineBookRepository,
+    private val dbRemoteKeyRepository: OfflineRemoteKeyRepository,
+    private val authorRestRepository: RestAuthorRepository,
+    private val database: AppDatabase
+):BookRepository {
+    override suspend fun getAll(): List<Book> {
+        return service.getBooks().map{x -> x.toBook()}
+    }
+
+    override suspend fun getByUid(uid: Int): Book {
+        return service.getBook(uid).toBook()
+    }
+
+    override suspend fun getBySearch(searchStr: String): List<Book> {
+        return service.getBySearch(searchStr).map{x -> x.toBook()}
+    }
+
+    override suspend fun getByAuthorId(authorId: Int): List<Book> {
+        return service.getByAuthor(authorId).map{ x -> x.toBook()}
+    }
+
+    override suspend fun getByUserId(userId: Int): List<Book> {
+        return service.getByUser(userId).map{ x -> x.toBook()}
+    }
+
+    override fun loadAllBooksPaged(): Flow<PagingData<Book>> {
+        Log.d(RestBookRepository::class.simpleName, "Get books")
+
+        val pagingSourceFactory = { dbBookRepository.loadBooksPaged() }
+
+        @OptIn(ExperimentalPagingApi::class)
+        return Pager(
+            config = PagingConfig(
+                pageSize = AppContainer.LIMIT,
+                enablePlaceholders = false
+            ),
+            remoteMediator = BookRemoteMediator(
+                service,
+                dbBookRepository,
+                dbRemoteKeyRepository,
+                authorRestRepository,
+                database,
+            ),
+            pagingSourceFactory = pagingSourceFactory
+        ).flow
+    }
+
+    override suspend fun insertBook(book: Book) {
+        dbBookRepository.insertBook(service.createBook(book.toBookRemote()).toBook())
+    }
+
+    override suspend fun updateBook(book: Book) {
+        service.updateBook(book.id, book.toBookRemote())
+        dbBookRepository.updateBook(book)
+    }
+
+    override suspend fun deleteBook(book: Book) {
+        service.deleteBook(book.id)
+        dbBookRepository.deleteBook(book)
+    }
+
+
+}
\ No newline at end of file
diff --git a/app/src/main/java/com/example/myapplication/api/respositories/RestUserRepository.kt b/app/src/main/java/com/example/myapplication/api/respositories/RestUserRepository.kt
new file mode 100644
index 0000000..5988667
--- /dev/null
+++ b/app/src/main/java/com/example/myapplication/api/respositories/RestUserRepository.kt
@@ -0,0 +1,47 @@
+package com.example.myapplication.api.respositories
+
+import com.example.myapplication.api.ServerService
+import com.example.myapplication.api.model.toUser
+import com.example.myapplication.api.model.toBook
+import com.example.myapplication.api.model.toUserRemote
+import com.example.myapplication.db.database.AppDatabase
+import com.example.myapplication.db.model.Book
+import com.example.myapplication.db.model.User
+import com.example.myapplication.db.respository.OfflineUserRepository
+import com.example.myapplication.db.respository.UserRepository
+
+class RestUserRepository(
+    private val service: ServerService,
+    private val dbUserRepository: OfflineUserRepository,
+    private val database: AppDatabase
+): UserRepository {
+    override suspend fun getAll(): List<User> {
+        return service.getUsers().map{x -> x.toUser()}
+    }
+
+    override suspend fun getByUid(uid: Int): User {
+        return service.getUser(uid).toUser()
+    }
+
+    override suspend fun getUserBooks(userid: Int): List<Book> {
+        return service.getByUser(userid).map{x -> x.toBook()}
+    }
+
+    override suspend fun tryLogin(login: String, password: String): User? {
+        return service.getUserByLoginPass(login, password).toUser()
+    }
+
+    override suspend fun insert(user: User) {
+        dbUserRepository.insert(service.createUser(user.toUserRemote()).toUser())
+    }
+
+    override suspend fun update(user: User) {
+        service.updateUser(user.uid, user.toUserRemote())
+        dbUserRepository.update(user)
+    }
+
+    override suspend fun delete(user: User) {
+        service.deleteUser(user.uid)
+        dbUserRepository.delete(user)
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/com/example/myapplication/composeui/AppViewModelProvider.kt b/app/src/main/java/com/example/myapplication/composeui/AppViewModelProvider.kt
index 68b0d99..b5e61ed 100644
--- a/app/src/main/java/com/example/myapplication/composeui/AppViewModelProvider.kt
+++ b/app/src/main/java/com/example/myapplication/composeui/AppViewModelProvider.kt
@@ -21,52 +21,52 @@ object AppViewModelProvider {
         initializer {
             UserPageViewModel(
                 this.createSavedStateHandle(),
-                myApplication().container.userRepository
+                myApplication().container.userRestRepository
             )
         }
         initializer {
             UserEditViewModel(
                 this.createSavedStateHandle(),
-                myApplication().container.userRepository
+                myApplication().container.userRestRepository
             )
         }
         initializer {
             SearchPageViewModel(
-                myApplication().container.bookRepository,
+                myApplication().container.bookRestRepository,
                 this.createSavedStateHandle()
             )
         }
         initializer {
             BookPageViewModel(
-                myApplication().container.bookRepository,
+                myApplication().container.bookRestRepository,
                 this.createSavedStateHandle()
             )
         }
         initializer {
             BookListViewModel(
-                myApplication().container.bookRepository
+                myApplication().container.bookRestRepository
             )
         }
         initializer {
             BookEditViewModel(
                 this.createSavedStateHandle(),
-                myApplication().container.bookRepository
+                myApplication().container.bookRestRepository
             )
         }
         initializer {
             AuthorListViewModel(
-                myApplication().container.authorRepository
+                myApplication().container.authorRestRepository
             )
         }
         initializer {
             AuthorEditViewModel(
                 this.createSavedStateHandle(),
-                myApplication().container.authorRepository
+                myApplication().container.authorRestRepository
             )
         }
         initializer {
             AuthorDropDownViewModel(
-                myApplication().container.authorRepository
+                myApplication().container.authorRestRepository
             )
         }
     }
diff --git a/app/src/main/java/com/example/myapplication/composeui/AuthorCell.kt b/app/src/main/java/com/example/myapplication/composeui/AuthorCell.kt
index ba9dfb3..95ffe12 100644
--- a/app/src/main/java/com/example/myapplication/composeui/AuthorCell.kt
+++ b/app/src/main/java/com/example/myapplication/composeui/AuthorCell.kt
@@ -56,7 +56,7 @@ fun AuthorCell(navController: NavController?, author: Author, viewModel: AuthorL
                 modifier = Modifier
                     .padding(all = 5.dp),
                 onClick = {
-                    val route = Screen.AuthorEdit.route.replace("{id}", author.uid.toString())
+                    val route = Screen.AuthorEdit.route.replace("{id}", author.id.toString())
                     navController!!.navigate(route)
                 },
             ) {
@@ -71,16 +71,7 @@ fun AuthorCell(navController: NavController?, author: Author, viewModel: AuthorL
                     .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),
diff --git a/app/src/main/java/com/example/myapplication/composeui/BookCell.kt b/app/src/main/java/com/example/myapplication/composeui/BookCell.kt
index 7d7d968..474fa01 100644
--- a/app/src/main/java/com/example/myapplication/composeui/BookCell.kt
+++ b/app/src/main/java/com/example/myapplication/composeui/BookCell.kt
@@ -46,7 +46,7 @@ fun BookCell(navController: NavController?, book: Book, viewModel: BookListViewM
             navController?.navigate(
                 Screen.BookView.route.replace(
                     "{id}",
-                    book.uid.toString()
+                    book.id.toString()
                 )
             )
         })
@@ -59,7 +59,7 @@ fun BookCell(navController: NavController?, book: Book, viewModel: BookListViewM
                 navController?.navigate(
                     Screen.BookView.route.replace(
                         "{id}",
-                        book.uid.toString()
+                        book.id.toString()
                     )
                 )
             }) {
@@ -79,7 +79,7 @@ fun BookCell(navController: NavController?, book: Book, viewModel: BookListViewM
                     modifier = Modifier
                         .padding(all = 5.dp),
                     onClick = {
-                        val route = Screen.BookEdit.route.replace("{id}", book.uid.toString())
+                        val route = Screen.BookEdit.route.replace("{id}", book.id.toString())
                         navController!!.navigate(route)
                     },
                 ) {
diff --git a/app/src/main/java/com/example/myapplication/composeui/BookEdit.kt b/app/src/main/java/com/example/myapplication/composeui/BookEdit.kt
index 64bad9e..6917b38 100644
--- a/app/src/main/java/com/example/myapplication/composeui/BookEdit.kt
+++ b/app/src/main/java/com/example/myapplication/composeui/BookEdit.kt
@@ -144,7 +144,7 @@ private fun BookEdit(
             authorUiState = authorUiState,
             authorsListUiState = authorsListUiState,
             onAuthorUpdate = {
-                onUpdate(bookUiState.bookDetails.copy(authorId = it.uid))
+                onUpdate(bookUiState.bookDetails.copy(authorId = it.id))
                 onAuthorUpdate(it)
             }
         )
diff --git a/app/src/main/java/com/example/myapplication/composeui/BookView.kt b/app/src/main/java/com/example/myapplication/composeui/BookView.kt
index b38b397..d1f3d22 100644
--- a/app/src/main/java/com/example/myapplication/composeui/BookView.kt
+++ b/app/src/main/java/com/example/myapplication/composeui/BookView.kt
@@ -46,9 +46,6 @@ private fun getBookImage(context: Context, imageId: String): Bitmap {
 fun BookView(navController: NavController, id: Int, viewModel: BookPageViewModel = viewModel(factory = AppViewModelProvider.Factory)) {
     val scope = rememberCoroutineScope()
     val book = viewModel.bookPageUiState
-    LaunchedEffect(Unit) {
-        viewModel.refreshState()
-    }
     val context = LocalContext.current
     Column(
         Modifier
diff --git a/app/src/main/java/com/example/myapplication/composeui/Enter.kt b/app/src/main/java/com/example/myapplication/composeui/Enter.kt
index cbb66b4..d64648e 100644
--- a/app/src/main/java/com/example/myapplication/composeui/Enter.kt
+++ b/app/src/main/java/com/example/myapplication/composeui/Enter.kt
@@ -29,6 +29,7 @@ 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.api.ServerService
 import com.example.myapplication.composeui.navigation.Screen
 import com.example.myapplication.db.database.AppDatabase
 import com.example.myapplication.db.model.User
@@ -44,6 +45,7 @@ fun Enter(navController: NavController) {
     var SingletonClass = SingletonClass()
     val scope = rememberCoroutineScope()
     val context = LocalContext.current
+    val service: ServerService
     var login by remember{mutableStateOf("")}
     var password by remember{mutableStateOf("")}
     Column(
@@ -65,15 +67,17 @@ fun Enter(navController: NavController) {
                 .fillMaxWidth()
                 .padding(all = 10.dp),
             onClick = {
-                scope.launch {if( AppDatabase.getInstance(context).userDao().tryLogin(login.toString(), password.toString()) != null){
-                    SingletonClass.setUserId(AppDatabase.getInstance(context).userDao().tryLogin(login.toString(), password.toString())?.uid!!)
-                    SingletonClass.setRole(AppDatabase.getInstance(context).userDao().tryLogin(login.toString(), password.toString())?.role!!)
+                scope.launch {
+                    //if( AppDatabase.getInstance(context).userDao().tryLogin(login.toString(), password.toString()) != null){
+                   // SingletonClass.setUserId(AppDatabase.getInstance(context).userDao().tryLogin(login.toString(), password.toString())?.uid!!)
+                    //SingletonClass.setRole(AppDatabase.getInstance(context).userDao().tryLogin(login.toString(), password.toString())?.role!!)
                     navController?.navigate(Screen.Profile.route)
+                //}
+                //else{
+                   // val toast = Toast.makeText(MainActivity.appContext, "Неверный логин или пароль", Toast.LENGTH_SHORT)
+                   // toast.show()
+                //}
                 }
-                else{
-                    val toast = Toast.makeText(MainActivity.appContext, "Неверный логин или пароль", Toast.LENGTH_SHORT)
-                    toast.show()
-                }}
             }) {
             Text(stringResource(id = R.string.enter))
         }
diff --git a/app/src/main/java/com/example/myapplication/composeui/ProfileEdit.kt b/app/src/main/java/com/example/myapplication/composeui/ProfileEdit.kt
index da17121..9b20926 100644
--- a/app/src/main/java/com/example/myapplication/composeui/ProfileEdit.kt
+++ b/app/src/main/java/com/example/myapplication/composeui/ProfileEdit.kt
@@ -1,42 +1,24 @@
 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
diff --git a/app/src/main/java/com/example/myapplication/composeui/ViewModel/AuthorDropDownViewModel.kt b/app/src/main/java/com/example/myapplication/composeui/ViewModel/AuthorDropDownViewModel.kt
index 007addc..9b36129 100644
--- a/app/src/main/java/com/example/myapplication/composeui/ViewModel/AuthorDropDownViewModel.kt
+++ b/app/src/main/java/com/example/myapplication/composeui/ViewModel/AuthorDropDownViewModel.kt
@@ -26,7 +26,7 @@ class AuthorDropDownViewModel(
 
     fun setCurrentAuthor(authorId: Int) {
         val author: Author? =
-            authorsListUiState.authorList.firstOrNull { author -> author.uid == authorId }
+            authorsListUiState.authorList.firstOrNull { author -> author.id == authorId }
         author?.let { updateUiState(it) }
     }
 
@@ -43,4 +43,4 @@ data class AuthorsUiState(
     val author: Author? = null
 )
 
-fun Author.toUiState() = AuthorsUiState(author = Author(uid = uid, name = name))
\ No newline at end of file
+fun Author.toUiState() = AuthorsUiState(author = Author(id = id, name = name))
\ No newline at end of file
diff --git a/app/src/main/java/com/example/myapplication/composeui/ViewModel/AuthorEditViewModel.kt b/app/src/main/java/com/example/myapplication/composeui/ViewModel/AuthorEditViewModel.kt
index 60e63b2..67ed9d0 100644
--- a/app/src/main/java/com/example/myapplication/composeui/ViewModel/AuthorEditViewModel.kt
+++ b/app/src/main/java/com/example/myapplication/composeui/ViewModel/AuthorEditViewModel.kt
@@ -36,9 +36,9 @@ class AuthorEditViewModel(savedStateHandle: SavedStateHandle,
     suspend fun saveAuthor() {
         if (validateInput()) {
             if (authorUid > 0) {
-                authorRepository.update(authorUiState.authorDetails.toAuthor(authorUid))
+                authorRepository.updateAuthor(authorUiState.authorDetails.toAuthor(authorUid))
             } else {
-                authorRepository.insert(authorUiState.authorDetails.toAuthor())
+                authorRepository.insertAuthor(authorUiState.authorDetails.toAuthor())
             }
         }
     }
@@ -57,7 +57,7 @@ data class AuthorDetails(
     val name: String = ""
 )
 fun AuthorDetails.toAuthor(uid: Int = 0): Author = Author(
-    uid = uid,
+    id = uid,
     name = name
 )
 
diff --git a/app/src/main/java/com/example/myapplication/composeui/ViewModel/AuthorListViewModel.kt b/app/src/main/java/com/example/myapplication/composeui/ViewModel/AuthorListViewModel.kt
index 9dab526..a021728 100644
--- a/app/src/main/java/com/example/myapplication/composeui/ViewModel/AuthorListViewModel.kt
+++ b/app/src/main/java/com/example/myapplication/composeui/ViewModel/AuthorListViewModel.kt
@@ -26,7 +26,7 @@ class AuthorListViewModel(
     }
     val authorPagedData: Flow<PagingData<Author>> = authorRepository.loadAllAuthorsPaged()
     suspend fun deleteAuthor(author: Author) {
-        authorRepository.delete(author)
+        authorRepository.deleteAuthor(author)
     }
 }
 data class AuthorListUiState(val authorList: List<Author> = listOf())
\ No newline at end of file
diff --git a/app/src/main/java/com/example/myapplication/composeui/ViewModel/BookEditViewModel.kt b/app/src/main/java/com/example/myapplication/composeui/ViewModel/BookEditViewModel.kt
index 8401d76..11480fb 100644
--- a/app/src/main/java/com/example/myapplication/composeui/ViewModel/BookEditViewModel.kt
+++ b/app/src/main/java/com/example/myapplication/composeui/ViewModel/BookEditViewModel.kt
@@ -36,9 +36,9 @@ class BookEditViewModel(savedStateHandle: SavedStateHandle,
     suspend fun saveBook() {
         if (validateInput()) {
             if (bookUid > 0) {
-                bookRepository.update(bookUiState.bookDetails.toBook(bookUid))
+                bookRepository.updateBook(bookUiState.bookDetails.toBook(bookUid))
             } else {
-                bookRepository.insert(bookUiState.bookDetails.toBook())
+                bookRepository.insertBook(bookUiState.bookDetails.toBook())
             }
         }
     }
@@ -67,7 +67,7 @@ data class BookDetails(
     val userId: Int = 0,
 )
 fun BookDetails.toBook(uid: Int = 0): Book = Book(
-    uid = uid,
+    id = uid,
     title = title,
     description = description,
     content = content,
diff --git a/app/src/main/java/com/example/myapplication/composeui/ViewModel/BookListViewModel.kt b/app/src/main/java/com/example/myapplication/composeui/ViewModel/BookListViewModel.kt
index 2d1e95b..af1022b 100644
--- a/app/src/main/java/com/example/myapplication/composeui/ViewModel/BookListViewModel.kt
+++ b/app/src/main/java/com/example/myapplication/composeui/ViewModel/BookListViewModel.kt
@@ -26,7 +26,7 @@ class BookListViewModel(
     }
     val bookPagedData: Flow<PagingData<Book>> = bookRepository.loadAllBooksPaged()
     suspend fun deleteBook(book: Book) {
-        bookRepository.delete(book)
+        bookRepository.deleteBook(book)
     }
 }
 
diff --git a/app/src/main/java/com/example/myapplication/composeui/ViewModel/BookPageViewModel.kt b/app/src/main/java/com/example/myapplication/composeui/ViewModel/BookPageViewModel.kt
index 412078b..7fa9c99 100644
--- a/app/src/main/java/com/example/myapplication/composeui/ViewModel/BookPageViewModel.kt
+++ b/app/src/main/java/com/example/myapplication/composeui/ViewModel/BookPageViewModel.kt
@@ -9,6 +9,16 @@ 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.flow.StateFlow
+import kotlinx.coroutines.launch
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.setValue
+import androidx.lifecycle.viewModelScope
+import com.example.myapplication.db.database.AppContainer
+import kotlinx.coroutines.flow.SharingStarted
+import kotlinx.coroutines.flow.flow
+import kotlinx.coroutines.flow.map
+import kotlinx.coroutines.flow.stateIn
 import kotlinx.coroutines.launch
 
 class BookPageViewModel(private val bookRespository: BookRepository, savedStateHandle: SavedStateHandle) : ViewModel(){
@@ -26,7 +36,7 @@ class BookPageViewModel(private val bookRespository: BookRepository, savedStateH
         bookPageUiState = BookPageUiState(bookRespository.getByUid(bookId))
     }
     suspend fun deleteBook(book: Book) {
-        bookRespository.delete(book)
+        bookRespository.deleteBook(book)
     }
 }
 
diff --git a/app/src/main/java/com/example/myapplication/composeui/ViewModel/SearchPageViewModel.kt b/app/src/main/java/com/example/myapplication/composeui/ViewModel/SearchPageViewModel.kt
index 09e3d19..de351de 100644
--- a/app/src/main/java/com/example/myapplication/composeui/ViewModel/SearchPageViewModel.kt
+++ b/app/src/main/java/com/example/myapplication/composeui/ViewModel/SearchPageViewModel.kt
@@ -7,10 +7,13 @@ import androidx.lifecycle.SavedStateHandle
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
 import androidx.paging.PagingData
+import androidx.paging.filter
 import com.example.myapplication.db.model.Book
 import com.example.myapplication.db.respository.BookRepository
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.map
+import java.util.Locale
 
 class SearchPageViewModel(private val bookRepository: BookRepository, savedStateHandle: SavedStateHandle) : ViewModel(){
     private val searchStr: String = checkNotNull(savedStateHandle["searchStr"])
@@ -25,7 +28,11 @@ class SearchPageViewModel(private val bookRepository: BookRepository, savedState
         searchPageUiState = SearchPageUiState(bookRepository.getBySearch(searchStr))
     }
 
-    val bookPagedData: Flow<PagingData<Book>> = bookRepository.loadAllBooksPaged()
+    val bookPagedData: Flow<PagingData<Book>> = bookRepository.loadAllBooksPaged().map{
+        x -> x.filter{
+            y-> (y.title.lowercase(Locale.ROOT)).contains(searchStr.lowercase(Locale.ROOT))
+        }
+    }
 }
 
 data class SearchPageUiState(val bookList: List<Book> = listOf())
\ No newline at end of file
diff --git a/app/src/main/java/com/example/myapplication/composeui/ViewModel/UserEditViewModel.kt b/app/src/main/java/com/example/myapplication/composeui/ViewModel/UserEditViewModel.kt
index 7ddbe2b..80135b9 100644
--- a/app/src/main/java/com/example/myapplication/composeui/ViewModel/UserEditViewModel.kt
+++ b/app/src/main/java/com/example/myapplication/composeui/ViewModel/UserEditViewModel.kt
@@ -21,7 +21,7 @@ class UserEditViewModel(savedStateHandle: SavedStateHandle,
     init {
         viewModelScope.launch {
             if (userUid > 0) {
-                userUiState = userRepository.getByUid(userUid)
+                userUiState = userRepository.getByUid(userUid)!!
                     .toUiState(true)
             }
         }
diff --git a/app/src/main/java/com/example/myapplication/db/dao/AuthorDao.kt b/app/src/main/java/com/example/myapplication/db/dao/AuthorDao.kt
index 85c0748..cb074d8 100644
--- a/app/src/main/java/com/example/myapplication/db/dao/AuthorDao.kt
+++ b/app/src/main/java/com/example/myapplication/db/dao/AuthorDao.kt
@@ -15,13 +15,15 @@ interface AuthorDao {
     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")
+    @Query("select * from authors where authors.id = :uid")
     suspend fun getByUid(uid: Int): Author
     @Query("select * from authors order by author_name collate nocase asc")
     fun loadAllAuthorsPaged(): PagingSource<Int, Author>
+    @Query("DELETE FROM authors")
+    suspend fun clearAll()
 
     @Insert
-    suspend fun insert(author: Author)
+    suspend fun insert(vararg author: Author)
 
     @Update
     suspend fun update(author: Author)
diff --git a/app/src/main/java/com/example/myapplication/db/dao/BookDao.kt b/app/src/main/java/com/example/myapplication/db/dao/BookDao.kt
index 301239d..f66ed55 100644
--- a/app/src/main/java/com/example/myapplication/db/dao/BookDao.kt
+++ b/app/src/main/java/com/example/myapplication/db/dao/BookDao.kt
@@ -15,23 +15,25 @@ interface BookDao {
     @Query("select * from books order by title collate nocase asc")
     suspend fun getAll(): List<Book>
 
-    @Query("select * from books where books.uid = :uid")
+    @Query("select * from books where books.id = :uid")
     suspend fun getByUid(uid: Int): Book
 
     @Query("select * from books where books.title LIKE '%' || :searchStr || '%'")
     suspend fun getBySearch(searchStr: String): List<Book>
 
     @Query("select * from books where books.user_id = :userId")
-    fun getByUserId(userId: Int): Flow<List<Book>>
+    suspend fun getByUserId(userId: Int): List<Book>
 
     @Query("select * from books where books.author_id = :authorId")
-    fun getByAuthorId(authorId: Int): Flow<List<Book>>
+    suspend fun getByAuthorId(authorId: Int): List<Book>
 
     @Query("select * from books order by title collate nocase asc")
     fun loadAllBooksPaged(): PagingSource<Int, Book>
+    @Query("DELETE FROM books")
+    suspend fun clearAll()
 
     @Insert
-    suspend fun insert(book: Book)
+    suspend fun insert(vararg book: Book)
 
     @Update
     suspend fun update(book: Book)
diff --git a/app/src/main/java/com/example/myapplication/db/dao/RemoteKeysDao.kt b/app/src/main/java/com/example/myapplication/db/dao/RemoteKeysDao.kt
new file mode 100644
index 0000000..3682cfc
--- /dev/null
+++ b/app/src/main/java/com/example/myapplication/db/dao/RemoteKeysDao.kt
@@ -0,0 +1,20 @@
+package com.example.myapplication.db.dao
+
+import androidx.room.Dao
+import androidx.room.Insert
+import androidx.room.OnConflictStrategy
+import androidx.room.Query
+import com.example.myapplication.db.model.RemoteKeyType
+import com.example.myapplication.db.model.RemoteKeys
+
+@Dao
+interface RemoteKeysDao {
+    @Query("SELECT * FROM remote_keys WHERE entityId = :entityId AND type = :type")
+    suspend fun getRemoteKeys(entityId: Int, type: RemoteKeyType): RemoteKeys?
+
+    @Insert(onConflict = OnConflictStrategy.REPLACE)
+    suspend fun insertAll(remoteKey: List<RemoteKeys>)
+
+    @Query("DELETE FROM remote_keys WHERE type = :type")
+    suspend fun clearRemoteKeys(type: RemoteKeyType)
+}
\ No newline at end of file
diff --git a/app/src/main/java/com/example/myapplication/db/dao/UserDao.kt b/app/src/main/java/com/example/myapplication/db/dao/UserDao.kt
index 3d59968..2953c59 100644
--- a/app/src/main/java/com/example/myapplication/db/dao/UserDao.kt
+++ b/app/src/main/java/com/example/myapplication/db/dao/UserDao.kt
@@ -12,13 +12,13 @@ import com.example.myapplication.db.model.Book;
 @Dao
 interface UserDao {
     @Query("select * from users")
-    fun getAll(): Flow<List<User>>
+    suspend fun getAll(): List<User>
 
     @Query("select * from users where users.uid = :uid")
-    suspend fun getByUid(uid: Int): User
+    suspend fun getByUid(uid: Int): User?
 
     @Query("select * from books where books.user_id = :userid")
-    fun getUserBooks(userid: Int): Flow<List<Book>>
+    suspend fun getUserBooks(userid: Int): List<Book>
 
     @Query("select * from users where login = :login and password = :password")
     suspend fun tryLogin(login: String, password: String): User?
diff --git a/app/src/main/java/com/example/myapplication/db/database/AppContainer.kt b/app/src/main/java/com/example/myapplication/db/database/AppContainer.kt
index 2613878..ff0c799 100644
--- a/app/src/main/java/com/example/myapplication/db/database/AppContainer.kt
+++ b/app/src/main/java/com/example/myapplication/db/database/AppContainer.kt
@@ -9,12 +9,17 @@ 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.OfflineRemoteKeyRepository
 import com.example.myapplication.db.respository.OfflineUserRepository
+import com.example.myapplication.api.respositories.RestBookRepository
+import com.example.myapplication.api.respositories.RestAuthorRepository
+import com.example.myapplication.api.respositories.RestUserRepository
+import com.example.myapplication.api.ServerService
 
 interface AppContainer {
-    val bookRepository: BookRepository
-    val authorRepository: AuthorRepository
-    val userRepository: UserRepository
+    val bookRestRepository: RestBookRepository
+    val authorRestRepository: RestAuthorRepository
+    val userRestRepository: RestUserRepository
     companion object {
         const val TIMEOUT = 5000L
         const val LIMIT = 10
@@ -22,15 +27,44 @@ interface AppContainer {
 }
 
 class AppDataContainer(private val context: Context) : AppContainer {
-    override val bookRepository: BookRepository by lazy {
+    private val bookRepository: OfflineBookRepository by lazy {
         OfflineBookRepository(AppDatabase.getInstance(context).bookDao())
     }
-    override val authorRepository: AuthorRepository by lazy {
+    private val authorRepository: OfflineAuthorRepository by lazy {
         OfflineAuthorRepository(AppDatabase.getInstance(context).authorDao())
     }
-    override val userRepository: UserRepository by lazy {
+    private val userRepository: OfflineUserRepository by lazy {
         OfflineUserRepository(AppDatabase.getInstance(context).userDao())
     }
+    private val remoteKeyRepository: OfflineRemoteKeyRepository by lazy {
+        OfflineRemoteKeyRepository(AppDatabase.getInstance(context).remoteKeysDao())
+    }
+
+    override val bookRestRepository: RestBookRepository by lazy {
+        RestBookRepository(
+            ServerService.getInstance(),
+            bookRepository,
+            remoteKeyRepository,
+            authorRestRepository,
+            AppDatabase.getInstance(context)
+        )
+    }
+
+    override val authorRestRepository: RestAuthorRepository by lazy {
+        RestAuthorRepository(
+            ServerService.getInstance(),
+            authorRepository,
+            remoteKeyRepository,
+            AppDatabase.getInstance(context)
+        )
+    }
+    override val userRestRepository: RestUserRepository by lazy{
+        RestUserRepository(
+            ServerService.getInstance(),
+            userRepository,
+            AppDatabase.getInstance(context)
+        )
+    }
 
     companion object {
         const val TIMEOUT = 5000L
diff --git a/app/src/main/java/com/example/myapplication/db/database/AppDatabase.kt b/app/src/main/java/com/example/myapplication/db/database/AppDatabase.kt
index 05c0b67..aa426ab 100644
--- a/app/src/main/java/com/example/myapplication/db/database/AppDatabase.kt
+++ b/app/src/main/java/com/example/myapplication/db/database/AppDatabase.kt
@@ -18,23 +18,26 @@ import com.example.myapplication.db.model.User;
 import com.example.myapplication.db.model.Book;
 import com.example.myapplication.db.model.Author;
 import com.example.myapplication.R
+import com.example.myapplication.db.dao.RemoteKeysDao
+import com.example.myapplication.db.model.RemoteKeys
 
-@Database(entities = [Book::class, Author::class, User::class], version = 1, exportSchema = false)
+@Database(entities = [Book::class, Author::class, User::class, RemoteKeys::class], version = 1, exportSchema = false)
 @TypeConverters(Converters::class)
 abstract class AppDatabase : RoomDatabase() {
     abstract fun bookDao(): BookDao
     abstract fun authorDao(): AuthorDao
     abstract fun userDao(): UserDao
+    abstract fun remoteKeysDao(): RemoteKeysDao
 
     companion object {
-        private const val DB_NAME: String = "PMU1"
+        private const val DB_NAME: String = "PMU4"
 
         @Volatile
         private var INSTANCE: AppDatabase? = null
 
         private suspend fun populateDatabase(context: Context) {
             INSTANCE?.let { database ->
-                //Users
+   /*             //Users
                 val userDao = database.userDao()
                 val user1 = User(1, "Admin", "Admin", "admin@mail.ru", "ADMIN")
                 val user2 = User(2, "User1", "123", "u1@mail.ru", "USER")
@@ -57,7 +60,7 @@ abstract class AppDatabase : RoomDatabase() {
                 bookDao.insert(book1)
                 bookDao.insert(book2)
                 bookDao.insert(book3)
-                bookDao.insert(book4)
+                bookDao.insert(book4)   */
             }
         }
 
diff --git a/app/src/main/java/com/example/myapplication/db/model/Author.kt b/app/src/main/java/com/example/myapplication/db/model/Author.kt
index d49932f..04abea0 100644
--- a/app/src/main/java/com/example/myapplication/db/model/Author.kt
+++ b/app/src/main/java/com/example/myapplication/db/model/Author.kt
@@ -8,7 +8,7 @@ import androidx.room.PrimaryKey
 @Entity(tableName = "authors")
 data class Author(
     @PrimaryKey(autoGenerate = true)
-    val uid: Int = 0,
+    val id: Int = 0,
     @ColumnInfo(name = "author_name")
     val name: String
 ) {
@@ -16,11 +16,11 @@ data class Author(
         if (this === other) return true
         if (javaClass != other?.javaClass) return false
         other as Author
-        if (uid != other.uid) return false
+        if (id != other.id) return false
         return true
     }
 
     override fun hashCode(): Int {
-        return uid ?: -1
+        return id ?: -1
     }
 }
\ No newline at end of file
diff --git a/app/src/main/java/com/example/myapplication/db/model/Book.kt b/app/src/main/java/com/example/myapplication/db/model/Book.kt
index 5b3b422..0e0880f 100644
--- a/app/src/main/java/com/example/myapplication/db/model/Book.kt
+++ b/app/src/main/java/com/example/myapplication/db/model/Book.kt
@@ -12,10 +12,10 @@ import androidx.room.Ignore
     tableName = "books", foreignKeys = [
         ForeignKey(
             entity = Author::class,
-            parentColumns = ["uid"],
+            parentColumns = ["id"],
             childColumns = ["author_id"],
-            onDelete = ForeignKey.RESTRICT,
-            onUpdate = ForeignKey.RESTRICT
+            onDelete = ForeignKey.CASCADE,
+            onUpdate = ForeignKey.CASCADE
         ),
         ForeignKey(
             entity = User::class,
@@ -28,7 +28,7 @@ import androidx.room.Ignore
 )
 data class Book(
     @PrimaryKey(autoGenerate = true)
-    val uid: Int = 0,
+    val id: Int = 0,
     @ColumnInfo(name = "title")
     val title: String,
     @ColumnInfo(name = "description")
@@ -47,11 +47,11 @@ data class Book(
         if (this === other) return true
         if (javaClass != other?.javaClass) return false
         other as Book
-        if (uid != other.uid) return false
+        if (id != other.id) return false
         return true
     }
 
     override fun hashCode(): Int {
-        return uid ?: -1
+        return id ?: -1
     }
 }
\ No newline at end of file
diff --git a/app/src/main/java/com/example/myapplication/db/model/RemoteKeys.kt b/app/src/main/java/com/example/myapplication/db/model/RemoteKeys.kt
new file mode 100644
index 0000000..287883a
--- /dev/null
+++ b/app/src/main/java/com/example/myapplication/db/model/RemoteKeys.kt
@@ -0,0 +1,26 @@
+package com.example.myapplication.db.model
+
+import androidx.room.Entity
+import androidx.room.PrimaryKey
+import androidx.room.TypeConverter
+import androidx.room.TypeConverters
+
+enum class RemoteKeyType(private val type: String) {
+    BOOK(Book::class.simpleName ?: "Book"),
+    AUTHOR(Author::class.simpleName ?: "Author");
+
+    @TypeConverter
+    fun toRemoteKeyType(value: String) = RemoteKeyType.values().first { it.type == value }
+
+    @TypeConverter
+    fun fromRemoteKeyType(value: RemoteKeyType) = value.type
+}
+
+@Entity(tableName = "remote_keys")
+data class RemoteKeys(
+    @PrimaryKey val entityId: Int,
+    @TypeConverters(RemoteKeyType::class)
+    val type: RemoteKeyType,
+    val prevKey: Int?,
+    val nextKey: Int?
+)
\ No newline at end of file
diff --git a/app/src/main/java/com/example/myapplication/db/respository/AuthorRepository.kt b/app/src/main/java/com/example/myapplication/db/respository/AuthorRepository.kt
index 43d38b9..a24eeb3 100644
--- a/app/src/main/java/com/example/myapplication/db/respository/AuthorRepository.kt
+++ b/app/src/main/java/com/example/myapplication/db/respository/AuthorRepository.kt
@@ -9,7 +9,7 @@ interface AuthorRepository {
     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)
+    suspend fun insertAuthor(author: Author)
+    suspend fun updateAuthor(author: Author)
+    suspend fun deleteAuthor(author: Author)
 }
\ No newline at end of file
diff --git a/app/src/main/java/com/example/myapplication/db/respository/BookRepository.kt b/app/src/main/java/com/example/myapplication/db/respository/BookRepository.kt
index 9b8801a..c50965d 100644
--- a/app/src/main/java/com/example/myapplication/db/respository/BookRepository.kt
+++ b/app/src/main/java/com/example/myapplication/db/respository/BookRepository.kt
@@ -10,10 +10,10 @@ 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>>
+    suspend fun getByUserId(userId: Int): List<Book>
+    suspend fun getByAuthorId(authorId: Int): List<Book>
     fun loadAllBooksPaged(): Flow<PagingData<Book>>
-    suspend fun insert(book: Book)
-    suspend fun update(book: Book)
-    suspend fun delete(book: Book)
+    suspend fun insertBook(book: Book)
+    suspend fun updateBook(book: Book)
+    suspend fun deleteBook(book: Book)
 }
\ No newline at end of file
diff --git a/app/src/main/java/com/example/myapplication/db/respository/OfflineAuthorRepository.kt b/app/src/main/java/com/example/myapplication/db/respository/OfflineAuthorRepository.kt
index d7dd8ae..4cb2011 100644
--- a/app/src/main/java/com/example/myapplication/db/respository/OfflineAuthorRepository.kt
+++ b/app/src/main/java/com/example/myapplication/db/respository/OfflineAuthorRepository.kt
@@ -13,6 +13,8 @@ class OfflineAuthorRepository(private val authorDao: AuthorDao) : AuthorReposito
     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)
+    suspend fun insertAuthors(authors: List<Author>) =
+        authorDao.insert(*authors.toTypedArray())
     override fun loadAllAuthorsPaged(): Flow<PagingData<Author>> = Pager(
         config = PagingConfig(
             pageSize = AppContainer.LIMIT,
@@ -21,9 +23,10 @@ class OfflineAuthorRepository(private val authorDao: AuthorDao) : AuthorReposito
         pagingSourceFactory = authorDao::loadAllAuthorsPaged
     ).flow
     fun loadAuthorsPaged(): PagingSource<Int, Author> = authorDao.loadAllAuthorsPaged()
-    override suspend fun insert(author: Author) = authorDao.insert(author)
+    suspend fun clearAll() = authorDao.clearAll()
+    override suspend fun insertAuthor(author: Author) = authorDao.insert(author)
 
-    override suspend fun update(author: Author) = authorDao.update(author)
+    override suspend fun updateAuthor(author: Author) = authorDao.update(author)
 
-    override suspend fun delete(author: Author) = authorDao.delete(author)
+    override suspend fun deleteAuthor(author: Author) = authorDao.delete(author)
 }
\ No newline at end of file
diff --git a/app/src/main/java/com/example/myapplication/db/respository/OfflineBookRepository.kt b/app/src/main/java/com/example/myapplication/db/respository/OfflineBookRepository.kt
index f372449..036077f 100644
--- a/app/src/main/java/com/example/myapplication/db/respository/OfflineBookRepository.kt
+++ b/app/src/main/java/com/example/myapplication/db/respository/OfflineBookRepository.kt
@@ -7,7 +7,6 @@ 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 {
@@ -17,8 +16,10 @@ class OfflineBookRepository(private val bookDao: BookDao) : BookRepository {
 
     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 suspend fun getByUserId(userId: Int): List<Book> = bookDao.getByUserId(userId)
+    override suspend fun getByAuthorId(authorId: Int): List<Book> = bookDao.getByAuthorId(authorId)
+    suspend fun insertBooks(books: List<Book>) =
+        bookDao.insert(*books.toTypedArray())
     override fun loadAllBooksPaged(): Flow<PagingData<Book>> = Pager(
         config = PagingConfig(
             pageSize = AppContainer.LIMIT,
@@ -27,9 +28,10 @@ class OfflineBookRepository(private val bookDao: BookDao) : BookRepository {
         pagingSourceFactory = bookDao::loadAllBooksPaged
     ).flow
     fun loadBooksPaged(): PagingSource<Int, Book> = bookDao.loadAllBooksPaged()
-    override suspend fun insert(book: Book) = bookDao.insert(book)
+    suspend fun clearAll() = bookDao.clearAll()
+    override suspend fun insertBook(book: Book) = bookDao.insert(book)
 
-    override suspend fun update(book: Book) = bookDao.update(book)
+    override suspend fun updateBook(book: Book) = bookDao.update(book)
 
-    override suspend fun delete(book: Book) = bookDao.delete(book)
+    override suspend fun deleteBook(book: Book) = bookDao.delete(book)
 }
\ No newline at end of file
diff --git a/app/src/main/java/com/example/myapplication/db/respository/OfflineRemoteKeyRepository.kt b/app/src/main/java/com/example/myapplication/db/respository/OfflineRemoteKeyRepository.kt
new file mode 100644
index 0000000..6ad9abe
--- /dev/null
+++ b/app/src/main/java/com/example/myapplication/db/respository/OfflineRemoteKeyRepository.kt
@@ -0,0 +1,16 @@
+package com.example.myapplication.db.respository
+
+import com.example.myapplication.db.dao.RemoteKeysDao
+import com.example.myapplication.db.model.RemoteKeyType
+import com.example.myapplication.db.model.RemoteKeys
+
+class OfflineRemoteKeyRepository( private val remoteKeysDao: RemoteKeysDao) : RemoteKeyRepository {
+    override suspend fun getAllRemoteKeys(id: Int, type: RemoteKeyType) =
+        remoteKeysDao.getRemoteKeys(id, type)
+
+    override suspend fun createRemoteKeys(remoteKeys: List<RemoteKeys>) =
+        remoteKeysDao.insertAll(remoteKeys)
+
+    override suspend fun deleteRemoteKey(type: RemoteKeyType) =
+        remoteKeysDao.clearRemoteKeys(type)
+}
\ No newline at end of file
diff --git a/app/src/main/java/com/example/myapplication/db/respository/OfflineUserRepository.kt b/app/src/main/java/com/example/myapplication/db/respository/OfflineUserRepository.kt
index 2eecd37..2a23343 100644
--- a/app/src/main/java/com/example/myapplication/db/respository/OfflineUserRepository.kt
+++ b/app/src/main/java/com/example/myapplication/db/respository/OfflineUserRepository.kt
@@ -6,11 +6,11 @@ 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 getAll(): List<User> = userDao.getAll()
 
-    override suspend fun getByUid(uid: Int): User = userDao.getByUid(uid)
+    override suspend fun getByUid(uid: Int): User? = userDao.getByUid(uid)
 
-    override fun getUserBooks(userid: Int): Flow<List<Book>> = userDao.getUserBooks(userid)
+    override suspend fun getUserBooks(userid: Int): List<Book> = userDao.getUserBooks(userid)
 
     override suspend fun tryLogin(login: String, password: String): User? = userDao.tryLogin(login, password)
 
diff --git a/app/src/main/java/com/example/myapplication/db/respository/RemoteKeyRepository.kt b/app/src/main/java/com/example/myapplication/db/respository/RemoteKeyRepository.kt
new file mode 100644
index 0000000..e5b6e2b
--- /dev/null
+++ b/app/src/main/java/com/example/myapplication/db/respository/RemoteKeyRepository.kt
@@ -0,0 +1,10 @@
+package com.example.myapplication.db.respository
+
+import com.example.myapplication.db.model.RemoteKeyType
+import com.example.myapplication.db.model.RemoteKeys
+
+interface RemoteKeyRepository {
+    suspend fun getAllRemoteKeys(id: Int, type: RemoteKeyType): RemoteKeys?
+    suspend fun createRemoteKeys(remoteKeys: List<RemoteKeys>)
+    suspend fun deleteRemoteKey(type: RemoteKeyType)
+}
\ No newline at end of file
diff --git a/app/src/main/java/com/example/myapplication/db/respository/UserRepository.kt b/app/src/main/java/com/example/myapplication/db/respository/UserRepository.kt
index d14dfce..ce534d2 100644
--- a/app/src/main/java/com/example/myapplication/db/respository/UserRepository.kt
+++ b/app/src/main/java/com/example/myapplication/db/respository/UserRepository.kt
@@ -4,9 +4,9 @@ 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 getAll(): List<User>
+    suspend fun getByUid(uid: Int): User?
+    suspend fun getUserBooks(userid: Int): List<Book>
     suspend fun tryLogin(login: String, password: String): User?
     suspend fun insert(user: User)
     suspend fun update(user: User)
diff --git a/app/src/main/res/xml/network_security_config.xml b/app/src/main/res/xml/network_security_config.xml
new file mode 100644
index 0000000..1fffd9e
--- /dev/null
+++ b/app/src/main/res/xml/network_security_config.xml
@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<network-security-config>
+    <domain-config cleartextTrafficPermitted="true">
+        <domain includeSubdomains="true">100.87.48.148</domain>
+        <domain includeSubdomains="true">192.168.56.1</domain>
+    </domain-config>
+</network-security-config>
\ No newline at end of file
diff --git a/build.gradle.kts b/build.gradle.kts
index 3b1b951..279adfa 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -3,4 +3,5 @@ plugins {
     id("com.android.application") version "8.1.2" apply false
     id("org.jetbrains.kotlin.android") version "1.8.20" apply false
     id("com.google.devtools.ksp") version "1.8.20-1.0.11" apply false
+    id("org.jetbrains.kotlin.plugin.serialization") version "1.8.20" apply false
 }
\ No newline at end of file