лаб 5

app/build.gradle.kts

@@ -2,6 +2,7 @@ plugins {
     id("com.android.application")
     id("org.jetbrains.kotlin.android")
     id ("kotlin-kapt")
+    kotlin("plugin.serialization") version "1.4.21"
 }
 
 android {
@@ -87,4 +88,12 @@ dependencies {
     //Paging
     implementation ("androidx.paging:paging-compose:3.2.1")
     implementation ("androidx.paging:paging-runtime:3.2.1")
+
+    // retrofit
+    val retrofitVersion = "2.9.0"
+    implementation("com.squareup.retrofit2:retrofit:$retrofitVersion")
+    implementation("com.squareup.okhttp3:logging-interceptor:4.11.0")
+    implementation("androidx.paging:paging-compose:3.2.1")
+    implementation("org.jetbrains.kotlinx:kotlinx-serialization-json:1.5.1")
+    implementation("com.jakewharton.retrofit:retrofit2-kotlinx-serialization-converter:1.0.0")
 }

app/src/main/java/com/example/androidlabs/AppContainer.kt

@@ -8,4 +8,8 @@ interface AppContainer {
     val hotelRepo: HotelRepository
     val userRepo: UserRepository
     val orderRepo: OrderRepository
+    companion object {
+        const val TIMEOUT = 5000L
+        const val LIMIT = 10
+    }
 }

app/src/main/java/com/example/androidlabs/AppDataContainer.kt

@@ -1,22 +1,38 @@
 package com.example.androidlabs
 
+import RestUserRepository
 import android.content.Context
 import com.example.androidlabs.DB.AppDatabase
 import com.example.androidlabs.DB.repository.HotelRepImpl
 import com.example.androidlabs.DB.repository.HotelRepository
-import com.example.androidlabs.DB.repository.OrderRepImpl
 import com.example.androidlabs.DB.repository.OrderRepository
-import com.example.androidlabs.DB.repository.UserRepImpl
+import com.example.androidlabs.DB.repository.RemoteKeysRepositoryImpl
 import com.example.androidlabs.DB.repository.UserRepository
+import com.example.androidlabs.api.BackendService
+import com.example.androidlabs.api.repository.RestHotelRepository
+import com.example.androidlabs.api.repository.RestOrderRepository
+
 
 class AppDataContainer(private val context: Context) : AppContainer {
     override val hotelRepo: HotelRepository by lazy {
-        HotelRepImpl(AppDatabase.getInstance(context).hotelDao())
+        RestHotelRepository(
+            BackendService.getInstance(),
+            hotelRepository,
+            AppDatabase.getInstance(context),
+            remoteKeyRepository
+        )
     }
     override val userRepo: UserRepository by lazy {
-        UserRepImpl(AppDatabase.getInstance(context).userDao())
+        RestUserRepository(BackendService.getInstance())
     }
+
     override val orderRepo: OrderRepository by lazy {
-        OrderRepImpl(AppDatabase.getInstance(context).orderDao())
+        RestOrderRepository(BackendService.getInstance())
+    }
+    private val hotelRepository: HotelRepImpl by lazy {
+        HotelRepImpl(AppDatabase.getInstance(context).hotelDao())
+    }
+    private val remoteKeyRepository: RemoteKeysRepositoryImpl by lazy {
+        RemoteKeysRepositoryImpl(AppDatabase.getInstance(context).remoteKeysDao())
     }
 }

app/src/main/java/com/example/androidlabs/DB/AppDatabase.kt

@@ -7,21 +7,25 @@ import androidx.room.RoomDatabase
 import androidx.sqlite.db.SupportSQLiteDatabase
 import com.example.androidlabs.DB.dao.HotelDao
 import com.example.androidlabs.DB.dao.OrderDao
+import com.example.androidlabs.DB.dao.RemoteKeysDao
 import com.example.androidlabs.DB.dao.UserDao
 import com.example.androidlabs.DB.models.Hotel
 import com.example.androidlabs.DB.models.Order
+import com.example.androidlabs.DB.models.RemoteKeys
 import com.example.androidlabs.DB.models.RoleEnum
 import com.example.androidlabs.DB.models.User
 import com.example.androidlabs.R
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.launch
-
+// TODO
-@Database(entities = [Hotel::class, User::class, Order::class], version = 5)
+@Database(entities = [Hotel::class, User::class, Order::class, RemoteKeys::class], version = 5)
 abstract class AppDatabase : RoomDatabase() {
     abstract fun hotelDao(): HotelDao
     abstract fun userDao(): UserDao
     abstract fun orderDao(): OrderDao
+    abstract fun remoteKeysDao(): RemoteKeysDao
+
 
     companion object {
         private const val DB_NAME: String = "my-db"
@@ -33,9 +37,9 @@ abstract class AppDatabase : RoomDatabase() {
             INSTANCE?.let { database ->
                 // User
                 val userDao = database.userDao()
-                val user1 = User(null, "Artem", "Emelyanov", "artem@mail.ru", "123", RoleEnum.User)
+                val user1 = User(null, "Artem", "Emelyanov", "artem@mail.ru", "123", "USER")
-                val user2 = User(null, "Danil", "Markov", "danil@mail.ru", "123", RoleEnum.User)
+                val user2 = User(null, "Danil", "Markov", "danil@mail.ru", "123", "ADMIN")
-                val user3 = User(null, "Viktoria", "Presnyakova", "vika@mail.ru", "123", RoleEnum.Admin)
+                val user3 = User(null, "Viktoria", "Presnyakova", "vika@mail.ru", "123", "USER")
                 userDao.createUser(user1)
                 userDao.createUser(user2)
                 userDao.createUser(user3)

app/src/main/java/com/example/androidlabs/DB/dao/HotelDao.kt

@@ -11,7 +11,7 @@ import kotlinx.coroutines.flow.Flow
 @Dao
 interface HotelDao {
     @Insert
-    suspend fun insert(hotel: Hotel)
+    suspend fun insert(vararg hotel: Hotel)
 
     @Update
     suspend fun update(hotel: Hotel)
@@ -24,4 +24,10 @@ interface HotelDao {
 
     @Query("SELECT * FROM Hotel WHERE hotelId = :id")
     suspend fun getHotelById(id: Int): Hotel
+
+    @Query("select * from Hotel")
+    fun getAll(): PagingSource<Int, Hotel>
+
+    @Query("DELETE FROM Hotel")
+    suspend fun deleteAll()
 }

app/src/main/java/com/example/androidlabs/DB/dao/RemoteKeysDao.kt

@@ -0,0 +1,19 @@
+package com.example.androidlabs.DB.dao
+
+import androidx.room.Dao
+import androidx.room.Insert
+import androidx.room.OnConflictStrategy
+import androidx.room.Query
+import com.example.androidlabs.DB.models.RemoteKeyType
+import com.example.androidlabs.DB.models.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)
+}

app/src/main/java/com/example/androidlabs/DB/models/Order.kt

@@ -21,6 +21,6 @@ data class Order(
     val creatorUserId: Int,
     @ColumnInfo(name = "BookedHotelId")
     val bookedHotelId: Int,
-    @Embedded
+//    @Embedded
-    val hotel: Hotel
+//    val hotel: Hotel
 )

app/src/main/java/com/example/androidlabs/DB/models/RemoteKeys.kt

@@ -0,0 +1,22 @@
+package com.example.androidlabs.DB.models
+
+import androidx.room.Entity
+import androidx.room.PrimaryKey
+import androidx.room.TypeConverter
+import androidx.room.TypeConverters
+
+enum class RemoteKeyType(private val type: String) {
+    SNEAKER(Hotel::class.simpleName ?: "Hotel");
+    @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?
+)

app/src/main/java/com/example/androidlabs/DB/models/User.kt

@@ -17,7 +17,7 @@ data class User(
     @ColumnInfo(name = "Password")
     val password: String,
     @ColumnInfo(name = "Role")
-    val role: RoleEnum,
+    val role: String,
     @ColumnInfo(name = "Photo")
     val photo: Int? = null,
 )

app/src/main/java/com/example/androidlabs/DB/repository/HotelRepImpl.kt

@@ -6,6 +6,7 @@ import androidx.paging.PagingData
 import com.example.androidlabs.DB.dao.HotelDao
 import com.example.androidlabs.DB.models.Hotel
 import androidx.paging.PagingSource
+import com.example.androidlabs.AppContainer
 import kotlinx.coroutines.flow.Flow
 
 
@@ -18,12 +19,17 @@ class HotelRepImpl (private val hotelDao: HotelDao) : HotelRepository {
     override suspend fun deleteHotel(hotel: Hotel) = hotelDao.delete(hotel)
 
     override suspend fun getHotelById(id: Int): Hotel = hotelDao.getHotelById(id)
-    override fun getAllHotelsPaged(): PagingSource<Int, Hotel> = hotelDao.getAllHotelsPaged()
+    override fun getAllHotels(): Flow<PagingData<Hotel>> = Pager(
-    override fun call(): Flow<PagingData<Hotel>> {
+        config = PagingConfig(
-        return Pager(
+            pageSize = AppContainer.LIMIT,
-            PagingConfig(pageSize = 5)
+            enablePlaceholders = false
-        ) {
+        ),
-            hotelDao.getAllHotelsPaged()
+        pagingSourceFactory = hotelDao::getAll
-        }.flow
+    ).flow
-    }
+
+    suspend fun clearHotels() = hotelDao.deleteAll()
+    suspend fun insertHotels(hotels: List<Hotel>) =
+        hotelDao.insert(*hotels.toTypedArray())
+
+    fun getAllHotelsPagingSource(): PagingSource<Int, Hotel> = hotelDao.getAll()
 }

app/src/main/java/com/example/androidlabs/DB/repository/HotelRepository.kt

@@ -9,6 +9,6 @@ interface HotelRepository {
     suspend fun updateHotel(hotel: Hotel)
     suspend fun deleteHotel(hotel: Hotel)
     suspend fun getHotelById(id: Int): Hotel
-    fun getAllHotelsPaged(): PagingSource<Int, Hotel>
+    fun getAllHotels(): Flow<PagingData<Hotel>>
-    fun call(): Flow<PagingData<Hotel>>
+
 }

app/src/main/java/com/example/androidlabs/DB/repository/OrderRepImpl.kt

@@ -1,17 +1,17 @@
-package com.example.androidlabs.DB.repository
+//package com.example.androidlabs.DB.repository
-
+//
-import com.example.androidlabs.DB.dao.OrderDao
+//import com.example.androidlabs.DB.dao.OrderDao
-import com.example.androidlabs.DB.models.Order
+//import com.example.androidlabs.DB.models.Order
-import com.example.androidlabs.DB.models.UserWithOrder
+//import com.example.androidlabs.DB.models.UserWithOrder
-import kotlinx.coroutines.flow.Flow
+//import kotlinx.coroutines.flow.Flow
-
+//
-class OrderRepImpl (private val orderDao: OrderDao) : OrderRepository {
+//class OrderRepImpl (private val orderDao: OrderDao) : OrderRepository {
-
+//
-    override suspend fun createOrder(order: Order): Long = orderDao.createOrder(order)
+//    override suspend fun createOrder(order: Order): Long = orderDao.createOrder(order)
-
+//
-    override suspend fun delete(order: Order) = orderDao.delete(order)
+//    override suspend fun delete(order: Order) = orderDao.delete(order)
-
+//
-    override fun getAllOrder(): Flow<List<Order>> = orderDao.getAllOrder()
+//    override fun getAllOrder(): Flow<List<Order>> = orderDao.getAllOrder()
-
+//
-    override fun getUserOrders(id: Int): Flow<UserWithOrder> = orderDao.getUserOrders(id)
+//    override fun getUserOrders(id: Int): Flow<UserWithOrder> = orderDao.getUserOrders(id)
-}
+//}

app/src/main/java/com/example/androidlabs/DB/repository/OrderRepository.kt

@@ -1,12 +1,15 @@
 package com.example.androidlabs.DB.repository
 
+import com.example.androidlabs.DB.models.Hotel
 import com.example.androidlabs.DB.models.Order
 import com.example.androidlabs.DB.models.UserWithOrder
 import kotlinx.coroutines.flow.Flow
 
 interface OrderRepository {
     suspend fun createOrder(order: Order): Long
-    suspend fun delete(order: Order)
+    suspend fun delete(orderId: Int)
-    fun getAllOrder(): Flow<List<Order>>
+    //fun getAllOrder(): Flow<List<Order>>
-    fun getUserOrders(id: Int) : Flow<UserWithOrder>
+    suspend fun getHotelFromOrder(id: Int): Hotel
+
+    suspend fun getUserOrders(id: Int) : Flow<List<Order>>
 }

app/src/main/java/com/example/androidlabs/DB/repository/RemoteKeyRepository.kt

@@ -0,0 +1,10 @@
+package com.example.androidlabs.DB.repository
+
+import com.example.androidlabs.DB.models.RemoteKeyType
+import com.example.androidlabs.DB.models.RemoteKeys
+
+interface RemoteKeyRepository {
+    suspend fun getAllRemoteKeys(id: Int, type: RemoteKeyType): RemoteKeys?
+    suspend fun createRemoteKeys(remoteKeys: List<RemoteKeys>)
+    suspend fun deleteRemoteKey(type: RemoteKeyType)
+}

app/src/main/java/com/example/androidlabs/DB/repository/RemoteKeysRepositoryImpl.kt

@@ -0,0 +1,16 @@
+package com.example.androidlabs.DB.repository
+
+import com.example.androidlabs.DB.dao.RemoteKeysDao
+import com.example.androidlabs.DB.models.RemoteKeyType
+import com.example.androidlabs.DB.models.RemoteKeys
+
+class RemoteKeysRepositoryImpl(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)
+}

app/src/main/java/com/example/androidlabs/DB/repository/UserRepImpl.kt

@@ -3,15 +3,15 @@ package com.example.androidlabs.DB.repository
 import com.example.androidlabs.DB.dao.UserDao
 import com.example.androidlabs.DB.models.User
 
-class UserRepImpl(private val userDao: UserDao) : UserRepository {
+//class UserRepImpl(private val userDao: UserDao) : UserRepository {
-
+//
-    override suspend fun createUser(user: User) = userDao.createUser(user)
+//    override suspend fun createUser(user: User) = userDao.createUser(user)
-
+//
-    override suspend fun updateUser(user: User) = userDao.updateUser(user)
+//    override suspend fun updateUser(user: User) = userDao.updateUser(user)
-
+//
-    override suspend fun deleteUser(user: User) = userDao.deleteUser(user)
+//    override suspend fun deleteUser(user: User) = userDao.deleteUser(user)
-
+//
-    override suspend fun getUserById(id: Int): User = userDao.getUserById(id)
+//    override suspend fun getUserById(id: Int): User = userDao.getUserById(id)
-
+//
-    override suspend fun getUserByEmail(email: String): User = userDao.getUserByEmail(email)
+//    override suspend fun getUserByEmail(email: String): User = userDao.getUserByEmail(email)
-}
+//}

app/src/main/java/com/example/androidlabs/DB/repository/UserRepository.kt

@@ -1,11 +1,11 @@
 package com.example.androidlabs.DB.repository
 
 import com.example.androidlabs.DB.models.User
+import com.example.androidlabs.api.model.UserRemoteSignIn
 
 interface UserRepository {
     suspend fun createUser(user: User)
     suspend fun updateUser(user: User)
     suspend fun deleteUser(user: User)
-    suspend fun getUserById(id: Int): User
+    suspend fun authUser(user: UserRemoteSignIn): User
-    suspend fun getUserByEmail(email: String): User
 }

app/src/main/java/com/example/androidlabs/DB/viewModels/HotelViewModel.kt

@@ -22,7 +22,7 @@ class HotelViewModel(private val hotelRepository: HotelRepository): ViewModel()
     val stars = mutableStateOf("")
     val info = mutableStateOf("")
     val img = mutableStateOf(R.drawable.img)
-    val HotelList = hotelRepository.call().cachedIn(viewModelScope)
+    val HotelList = hotelRepository.getAllHotels()
     var hotel: Hotel? = null
 
     fun insertHotel() = viewModelScope.launch {

app/src/main/java/com/example/androidlabs/DB/viewModels/OrderViewModel.kt

@@ -23,14 +23,17 @@ class OrderViewModel(private val orderRepository: OrderRepository) : ViewModel()
     var dateFrom = mutableStateOf("")
     var dateTo = mutableStateOf("")
 
-    fun deleteOrder(order: Order) = viewModelScope.launch {
+    fun deleteOrder(orderId: Int) = viewModelScope.launch {
-        orderRepository.delete(order)
+        orderRepository.delete(orderId)
     }
 
-    fun getOrderList(id: Int) : Flow<UserWithOrder> {
+    suspend fun getOrderList(id: Int) : Flow<List<Order>> {
         return orderRepository.getUserOrders(id)
     }
 
+    suspend fun getHotelFromOrder(id: Int) : Hotel {
+        return orderRepository.getHotelFromOrder(id)
+    }
 
     fun createOrder() = viewModelScope.launch {
         Log.d("MyLog", GlobalUser.getInstance().getUser()?.userId.toString())
@@ -42,7 +45,7 @@ class OrderViewModel(private val orderRepository: OrderRepository) : ViewModel()
             total = getSubTotal(),
             bookedHotelId = selectedItem?.hotelId!!,
             creatorUserId = GlobalUser.getInstance().getUser()?.userId!!,
-            hotel = selectedItem!!
+            //hotel = selectedItem!!
         )
 
         val orderId = orderRepository.createOrder(order)

app/src/main/java/com/example/androidlabs/DB/viewModels/UserViewModel.kt

@@ -12,6 +12,8 @@ import com.example.androidlabs.DB.models.RoleEnum
 import com.example.androidlabs.DB.models.User
 import com.example.androidlabs.DB.repository.UserRepository
 import com.example.androidlabs.GlobalUser
+import com.example.androidlabs.R
+import com.example.androidlabs.api.model.UserRemoteSignIn
 
 import kotlinx.coroutines.launch
 class UserViewModel(private val userRepository: UserRepository): ViewModel() {
@@ -26,22 +28,17 @@ class UserViewModel(private val userRepository: UserRepository): ViewModel() {
             surname = surname.value,
             email = email.value,
             password = password.value,
-            role = RoleEnum.User
+            role = "USER",
+            photo = R.drawable.img_2
         )
         userRepository.createUser(user)
     }
     fun authUser() = viewModelScope.launch {
-        val user = userRepository.getUserByEmail(email.value)
+        val user = userRepository.authUser(UserRemoteSignIn(email.value, password.value))
-        if (password.value != "" && user.password == password.value) {
+        GlobalUser.getInstance().setUser(user)
-            val globalUser = GlobalUser.getInstance()
+    }
-            globalUser.setUser(user)
-            Log.d("MyLog", GlobalUser.getInstance().getUser()?.userId.toString())
-            println()
 
-        }
-    }
     fun isValidEmail(email: String): Boolean {
         return android.util.Patterns.EMAIL_ADDRESS.matcher(email).matches()
     }
-
 }

app/src/main/java/com/example/androidlabs/MyOrderScreen/MyOrderScreen.kt

@@ -10,6 +10,7 @@ import androidx.compose.foundation.verticalScroll
 import androidx.compose.material.MaterialTheme
 import androidx.compose.material.Text
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.text.font.FontWeight
@@ -19,13 +20,24 @@ import com.example.androidlabs.DB.viewModels.OrderViewModel
 import com.example.androidlabs.GlobalUser
 import androidx.compose.runtime.collectAsState
 import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
+import androidx.lifecycle.viewmodel.compose.viewModel
+import com.example.androidlabs.DB.viewModels.AppViewModelProvider
+import kotlinx.coroutines.flow.first
+
+
+
 
 @Composable
-fun MyOrderScreen(orderViewModel: OrderViewModel) {
+fun MyOrderScreen(orderViewModel: OrderViewModel= viewModel(factory = AppViewModelProvider.Factory)) {
 //    val userWithOrder by orderViewModel.database.userDao().getUserOrders(GlobalUser.getInstance().getUser()?.userId!!).collectAsState(null)
     val userId = GlobalUser.getInstance().getUser()?.userId
-    val userWithOrder = orderViewModel.getOrderList(userId!!).collectAsState(null).value?.orders
+    var usersOrder by remember { mutableStateOf<List<Order>>(emptyList()) }
-    println()
+    LaunchedEffect(userId) {
+        usersOrder = orderViewModel.getOrderList(userId!!).first()
+    }
     Column(
         modifier = Modifier
             .padding(bottom = 50.dp)
@@ -46,9 +58,9 @@ fun MyOrderScreen(orderViewModel: OrderViewModel) {
                 modifier = Modifier
                     .fillMaxSize()
             ) {
-                if (userWithOrder != null) {
+                if (usersOrder != null) {
-                    for (item in userWithOrder) {
+                    for (item in usersOrder) {
-                        OrderCard(item, orderViewModel)
+                        OrderCard(item)
                     }
                 }
             }

app/src/main/java/com/example/androidlabs/MyOrderScreen/OrderCard.kt

@@ -14,6 +14,10 @@ import androidx.compose.material.ButtonDefaults
 import androidx.compose.material.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.clip
 import androidx.compose.ui.graphics.Color
@@ -22,9 +26,11 @@ import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.res.colorResource
 import androidx.compose.ui.res.painterResource
 import androidx.compose.ui.unit.dp
+import androidx.lifecycle.viewmodel.compose.viewModel
 import com.example.androidlabs.DB.AppDatabase
 import com.example.androidlabs.DB.models.Hotel
 import com.example.androidlabs.DB.models.Order
+import com.example.androidlabs.DB.viewModels.AppViewModelProvider
 import com.example.androidlabs.DB.viewModels.OrderViewModel
 import com.example.androidlabs.R
 import kotlinx.coroutines.Dispatchers
@@ -32,7 +38,11 @@ import kotlinx.coroutines.withContext
 import java.util.Date
 
 @Composable
-fun OrderCard(order: Order, orderViewModel: OrderViewModel){
+fun OrderCard(order: Order, orderViewModel: OrderViewModel = viewModel(factory = AppViewModelProvider.Factory)){
+    var hotels by remember { mutableStateOf<List<Hotel>>(emptyList()) }
+    LaunchedEffect(order.orderId) {
+        hotels = listOf(orderViewModel.getHotelFromOrder(order.orderId!!))
+    }
     Row(
         modifier = Modifier
             .fillMaxWidth()
@@ -53,17 +63,18 @@ fun OrderCard(order: Order, orderViewModel: OrderViewModel){
 
 
             Row(){
-
+                if (hotels != null) {
+                    for(hotel in hotels) {
                         Image(
                             contentScale = ContentScale.FillBounds,
-                            painter = painterResource(id =order.hotel.img),
+                            painter = painterResource(id = hotel.img), // TODO
                             contentDescription = null,
                             modifier = Modifier
                                 .size(70.dp)
                                 .padding(0.dp, 10.dp, 10.dp, 10.dp)
                         )
-
+                    }
-
+                }
             }
             Button(
                 colors = ButtonDefaults.buttonColors(
@@ -71,7 +82,7 @@ fun OrderCard(order: Order, orderViewModel: OrderViewModel){
                     contentColor = Color.White
                 ),
                 onClick = {
-                    orderViewModel.deleteOrder(order)
+                    orderViewModel.deleteOrder(order.orderId!!)
                 },
                 modifier = Modifier
                     .fillMaxWidth()

app/src/main/java/com/example/androidlabs/Navigation/NavController.kt

@@ -24,7 +24,6 @@ import com.google.gson.Gson
 
 @Composable
 fun NavController(navController: NavHostController) {
-    var orderViewModel: OrderViewModel = viewModel(factory = AppViewModelProvider.Factory)
     NavHost(
         navController = navController,
         startDestination = NavItem.Home.route
@@ -41,7 +40,7 @@ fun NavController(navController: NavHostController) {
             HomeScreen(navController)
         }
         composable(NavItem.MyOrder.route){
-            MyOrderScreen(orderViewModel)
+            MyOrderScreen()
         }
         composable(NavItem.Profile.route) {
             ProfileScreen(navController)
@@ -56,7 +55,7 @@ fun NavController(navController: NavHostController) {
             backStackEntry ->
             val hotelItemString = backStackEntry.arguments?.getString("hotelItem")
             val hotelItem = Gson().fromJson(hotelItemString, Hotel::class.java)
-            hotelItem?.let { BookingScreen(orderViewModel, it, navController)
+            hotelItem?.let { BookingScreen(it, navController)
             }
         }
         composable(NavItem.ChangeHotel.route) { backStackEntry ->

app/src/main/java/com/example/androidlabs/adminPanel/AdminPanel.kt

@@ -26,7 +26,7 @@ import com.example.androidlabs.profileScreen.signIn.LoginScreen
 fun AdminPanel(navHostController: NavHostController) {
     var isAddPanelVisible by remember { mutableStateOf(false) }
     var isChangePanelVisible by remember { mutableStateOf(true) }
-    var showDialog by remember { mutableStateOf(GlobalUser.getInstance().getUser()?.role == RoleEnum.User || GlobalUser.getInstance().getUser()?.role == null) }
+    var showDialog by remember { mutableStateOf(GlobalUser.getInstance().getUser()?.role == "USER" || GlobalUser.getInstance().getUser()?.role == null) }
     if (showDialog) {
         AlertDialog(
             onDismissRequest = { showDialog = false },

app/src/main/java/com/example/androidlabs/api/BackendService.kt

@@ -0,0 +1,105 @@
+package com.example.androidlabs.api
+
+import com.example.androidlabs.api.model.HotelRemote
+import com.example.androidlabs.api.model.OrderRemote
+import com.example.androidlabs.api.model.UserRemote
+import com.example.androidlabs.api.model.UserRemoteSignIn
+import com.jakewharton.retrofit2.converter.kotlinx.serialization.asConverterFactory
+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 BackendService {
+
+    //SNEAKER
+    @GET("hotel/get/{id}")
+    suspend fun getHotel(
+        @Path("id") id: Int,
+    ): HotelRemote
+
+    @GET("hotel/getAll")
+    suspend fun getHotels(
+        @Query("page") page: Int,
+        @Query("size") size: Int,
+    ): List<HotelRemote>
+
+    @POST("hotel/create")
+    suspend fun createHotel(
+        @Body hotel: HotelRemote,
+    ): HotelRemote
+
+    @PUT("hotel/update/{id}")
+    suspend fun updateHotel(
+        @Path("id") id: Int,
+        @Body hotel: HotelRemote
+    ): HotelRemote
+
+    @DELETE("sneaker/delete/{id}")
+    suspend fun deleteHotel(
+        @Path("id") id: Int
+    )
+
+    //USER
+    @POST("user/signup")
+    suspend fun SignUp(
+        @Body user: UserRemote,
+    ): UserRemote
+
+    @POST("user/signin")
+    suspend fun SignIn(
+        @Body user: UserRemoteSignIn
+    ): UserRemote
+
+    @POST("order/create")
+    suspend fun createOrder(
+        @Body order: OrderRemote
+    ): Long
+
+    @GET("order/getUserOrders/{userId}")
+    suspend fun getUserOrders(
+        @Path("userId") userId: Int
+    ) : List<OrderRemote>
+
+    @GET("order/getHotelFromOrder/{orderId}")
+    suspend fun getHotelFromOrder(
+        @Path("orderId") orderId: Int
+    ) : HotelRemote
+
+    @GET("order/deleteOrder/{orderId}")
+    suspend fun deleteOrder(
+        @Path("orderId") orderId: Int
+    )
+
+    companion object {
+        private const val BASE_URL = "https://59k4pfj3-8080.euw.devtunnels.ms/api/"
+
+        @Volatile
+        private var INSTANCE: BackendService? = null
+
+        fun getInstance(): BackendService {
+            return INSTANCE ?: synchronized(this) {
+                val logger = HttpLoggingInterceptor()
+                logger.level = HttpLoggingInterceptor.Level.BASIC
+                val client = OkHttpClient.Builder()
+                    .addInterceptor(logger)
+                    .build()
+                return Retrofit.Builder()
+                    .baseUrl(BASE_URL)
+                    .client(client)
+                    .addConverterFactory(Json.asConverterFactory("application/json".toMediaType()))
+                    .build()
+                    .create(BackendService::class.java)
+                    .also { INSTANCE = it }
+            }
+        }
+    }
+}

app/src/main/java/com/example/androidlabs/api/HotelRemoteMediator.kt

@@ -0,0 +1,104 @@
+package com.example.androidlabs.api
+
+import androidx.paging.ExperimentalPagingApi
+import androidx.paging.LoadType
+import androidx.paging.PagingState
+import androidx.paging.RemoteMediator
+import androidx.room.withTransaction
+import com.example.androidlabs.DB.AppDatabase
+import com.example.androidlabs.DB.models.Hotel
+import com.example.androidlabs.DB.models.RemoteKeyType
+import com.example.androidlabs.DB.models.RemoteKeys
+import com.example.androidlabs.DB.repository.HotelRepImpl
+import com.example.androidlabs.DB.repository.RemoteKeysRepositoryImpl
+import com.example.androidlabs.api.model.toHotel
+
+import retrofit2.HttpException
+import java.io.IOException
+
+@OptIn(ExperimentalPagingApi::class)
+class HotelRemoteMediator(
+    private val service: BackendService,
+    private val hotelRepository: HotelRepImpl,
+    private val database: AppDatabase,
+    private val dbRemoteKeyRepository: RemoteKeysRepositoryImpl
+) : RemoteMediator<Int, Hotel>() {
+    override suspend fun initialize(): InitializeAction {
+        return InitializeAction.LAUNCH_INITIAL_REFRESH
+    }
+    override suspend fun load(
+        loadType: LoadType,
+        state: PagingState<Int, Hotel>
+    ): 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 sneakers = service.getHotels(page, state.config.pageSize).map { it.toHotel() }
+            val endOfPaginationReached = sneakers.isEmpty()
+            database.withTransaction {
+                if (loadType == LoadType.REFRESH) {
+                    dbRemoteKeyRepository.deleteRemoteKey(RemoteKeyType.SNEAKER)
+                    hotelRepository.clearHotels()
+                }
+                val prevKey = if (page == 1) null else page - 1
+                val nextKey = if (endOfPaginationReached) null else page + 1
+                val keys = sneakers.map {
+                    RemoteKeys(
+                        entityId = it.hotelId!!,
+                        type = RemoteKeyType.SNEAKER,
+                        prevKey = prevKey,
+                        nextKey = nextKey
+                    )
+                }
+                dbRemoteKeyRepository.createRemoteKeys(keys)
+                hotelRepository.insertHotels(sneakers)
+            }
+            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, Hotel>): RemoteKeys? {
+        return state.pages.lastOrNull { it.data.isNotEmpty() }?.data?.lastOrNull()
+            ?.let { hotel ->
+                hotel.hotelId?.let { dbRemoteKeyRepository.getAllRemoteKeys(it, RemoteKeyType.SNEAKER) }
+            }
+    }
+
+    private suspend fun getRemoteKeyForFirstItem(state: PagingState<Int, Hotel>): RemoteKeys? {
+        return state.pages.firstOrNull { it.data.isNotEmpty() }?.data?.firstOrNull()
+            ?.let { hotel ->
+                hotel.hotelId?.let { dbRemoteKeyRepository.getAllRemoteKeys(it, RemoteKeyType.SNEAKER) }
+            }
+    }
+
+    private suspend fun getRemoteKeyClosestToCurrentPosition(
+        state: PagingState<Int, Hotel>
+    ): RemoteKeys? {
+        return state.anchorPosition?.let { position ->
+            state.closestItemToPosition(position)?.hotelId?.let { hotelUid ->
+                dbRemoteKeyRepository.getAllRemoteKeys(hotelUid, RemoteKeyType.SNEAKER)
+            }
+        }
+    }
+}

app/src/main/java/com/example/androidlabs/api/model/HotelRemote.kt

@@ -0,0 +1,36 @@
+package com.example.androidlabs.api.model
+
+import com.example.androidlabs.DB.models.Hotel
+import kotlinx.serialization.Serializable
+
+@Serializable
+data class HotelRemote (
+    val id: Int? = 0,
+    val name: String = "",
+    val price: Double = 0.0,
+    val img: Int = 0,
+    val stars: Int = 0,
+    val location: String = "",
+    val info: String = "",
+
+    )
+
+fun HotelRemote.toHotel(): Hotel = Hotel(
+    id,
+    name,
+    price,
+    img,
+    stars,
+    location,
+    info
+)
+
+fun Hotel.toHotelRemote():HotelRemote = HotelRemote(
+    hotelId,
+    name,
+    price,
+    img,
+    stars,
+    location,
+    info
+)

app/src/main/java/com/example/androidlabs/api/model/OrderRemote.kt

@@ -0,0 +1,39 @@
+package com.example.androidlabs.api.model
+
+import androidx.room.ColumnInfo
+import androidx.room.PrimaryKey
+import com.example.androidlabs.DB.models.Hotel
+import com.example.androidlabs.DB.models.Order
+
+import kotlinx.serialization.Serializable
+
+@Serializable
+data class OrderRemote(
+    val id: Int? = 0,
+    val dateFrom: String = "",
+    val dateTo: String = "",
+    val rooms: Int = 0,
+    val total: Double = 0.0,
+    val userId: Int = 0,
+    val bookedHotelId: Int = 0
+    )
+
+fun OrderRemote.toOrder(): Order = Order(
+    id,
+    dateFrom,
+    dateTo,
+    rooms,
+    total,
+    userId,
+    bookedHotelId,
+    )
+
+fun Order.toOrderRemote():OrderRemote = OrderRemote(
+    orderId,
+    dateFrom,
+    dateTo,
+    rooms,
+    total,
+    creatorUserId,
+    bookedHotelId,
+)

app/src/main/java/com/example/androidlabs/api/model/UserRemote.kt

@@ -0,0 +1,41 @@
+package com.example.androidlabs.api.model
+
+import androidx.room.ColumnInfo
+import androidx.room.PrimaryKey
+
+import com.example.androidlabs.DB.models.User
+import com.example.androidlabs.DB.models.RoleEnum
+
+import kotlinx.serialization.Serializable
+
+@Serializable
+data class UserRemote (
+    val id: Int? = 0,
+    val name: String = "",
+    val surname: String = "",
+    val email: String = "",
+    val password: String = "",
+    val role: String = "",
+    val photo: Int? = 0,
+)
+
+
+fun UserRemote.toUser(): User = User(
+    id,
+    name,
+    surname,
+    email,
+    password,
+    role,
+    photo
+)
+
+fun User.toUserRemote():UserRemote = UserRemote(
+    userId,
+    name,
+    surname,
+    email,
+    password,
+    role,
+    photo
+)

app/src/main/java/com/example/androidlabs/api/model/UserRemoteSignIn.kt

@@ -0,0 +1,9 @@
+package com.example.androidlabs.api.model
+
+import kotlinx.serialization.Serializable
+
+@Serializable
+data class UserRemoteSignIn(
+    val email: String = "",
+    val password: String = "",
+)

app/src/main/java/com/example/androidlabs/api/repository/RestHotelRepository.kt

@@ -0,0 +1,60 @@
+package com.example.androidlabs.api.repository
+
+
+import androidx.paging.ExperimentalPagingApi
+import androidx.paging.Pager
+import androidx.paging.PagingConfig
+import androidx.paging.PagingData
+import com.example.androidlabs.AppContainer
+import com.example.androidlabs.DB.AppDatabase
+import com.example.androidlabs.DB.models.Hotel
+import com.example.androidlabs.DB.repository.HotelRepImpl
+import com.example.androidlabs.DB.repository.HotelRepository
+import com.example.androidlabs.DB.repository.RemoteKeysRepositoryImpl
+import com.example.androidlabs.api.BackendService
+import com.example.androidlabs.api.HotelRemoteMediator
+import com.example.androidlabs.api.model.toHotel
+import com.example.androidlabs.api.model.toHotelRemote
+
+import kotlinx.coroutines.flow.Flow
+
+class RestHotelRepository(
+    private val service: BackendService,
+    private val dbHotelRepository: HotelRepImpl,
+    private val database: AppDatabase,
+    private val dbRemoteKeyRepository: RemoteKeysRepositoryImpl
+
+) : HotelRepository {
+
+    override fun getAllHotels(): Flow<PagingData<Hotel>> {
+        val pagingSourceFactory = { dbHotelRepository.getAllHotelsPagingSource() }
+
+        @OptIn(ExperimentalPagingApi::class)
+        return Pager(
+            config = PagingConfig(
+                pageSize = AppContainer.LIMIT,
+                enablePlaceholders = false
+            ),
+            remoteMediator = HotelRemoteMediator(
+                service,
+                dbHotelRepository,
+                database,
+                dbRemoteKeyRepository,
+            ),
+            pagingSourceFactory = pagingSourceFactory
+        ).flow
+    }
+
+    override suspend fun getHotelById(id: Int): Hotel = service.getHotel(id).toHotel()
+    override suspend fun insertHotel(hotel: Hotel) {
+        service.createHotel(hotel.toHotelRemote())
+    }
+
+    override suspend fun updateHotel(hotel: Hotel) {
+        hotel.hotelId?.let { service.updateHotel(it, hotel.toHotelRemote()) }
+    }
+
+    override suspend fun deleteHotel(hotel: Hotel) {
+        hotel.hotelId?.let { service.deleteHotel(it) }
+    }
+}

app/src/main/java/com/example/androidlabs/api/repository/RestOrderRepository.kt

@@ -0,0 +1,32 @@
+package com.example.androidlabs.api.repository
+
+import com.example.androidlabs.DB.models.Hotel
+import com.example.androidlabs.DB.models.Order
+import com.example.androidlabs.DB.repository.OrderRepository
+import com.example.androidlabs.api.BackendService
+import com.example.androidlabs.api.model.toHotel
+import com.example.androidlabs.api.model.toOrder
+import com.example.androidlabs.api.model.toOrderRemote
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.flowOf
+
+class RestOrderRepository(private val service: BackendService): OrderRepository {
+    override suspend fun createOrder(order: Order): Long {
+        return service.createOrder(order.toOrderRemote())
+    }
+
+
+    override suspend fun delete(orderId: Int) {
+        service.deleteOrder(orderId)
+    }
+
+    override suspend fun getHotelFromOrder(id: Int): Hotel {
+        return service.getHotelFromOrder(id).toHotel()
+    }
+
+    override suspend fun getUserOrders(id: Int): Flow<List<Order>> {
+        val ordersRemoteList = service.getUserOrders(id)
+        val ordersList = ordersRemoteList.map { it.toOrder() }
+        return flowOf(ordersList.toList())
+    }
+}

app/src/main/java/com/example/androidlabs/api/repository/RestUserRepository.kt

@@ -0,0 +1,25 @@
+import com.example.androidlabs.DB.models.User
+import com.example.androidlabs.DB.repository.UserRepository
+import com.example.androidlabs.api.BackendService
+import com.example.androidlabs.api.model.UserRemoteSignIn
+import com.example.androidlabs.api.model.toUser
+import com.example.androidlabs.api.model.toUserRemote
+
+class RestUserRepository(
+    private var service: BackendService
+): UserRepository {
+    override suspend fun createUser(user: User) {
+        service.SignUp(user.toUserRemote())
+    }
+
+    override suspend fun updateUser(user: User) {
+        println()
+    }
+
+    override suspend fun deleteUser(user: User) {
+        println()
+    }
+    override suspend fun authUser(user: UserRemoteSignIn): User {
+        return service.SignIn(user).toUser()
+    }
+}

app/src/main/java/com/example/androidlabs/booking/BookingScreen.kt

@@ -40,11 +40,13 @@ import com.example.androidlabs.R
 import android.app.DatePickerDialog
 import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.text.style.TextAlign
+import androidx.lifecycle.viewmodel.compose.viewModel
+import com.example.androidlabs.DB.viewModels.AppViewModelProvider
 import java.util.Calendar
 import java.util.Date
 
 @Composable
-fun BookingScreen(orderViewModel: OrderViewModel, hotel: Hotel, navHostController: NavHostController) {
+fun BookingScreen(hotel: Hotel, navHostController: NavHostController, orderViewModel: OrderViewModel = viewModel(factory = AppViewModelProvider.Factory)) {
     Column(
         modifier = Modifier
             .fillMaxSize()