Вторая часть по кэшу

client-mobile/chats/data/repository/ChatRepositoryImpl.kt

@@ -1,6 +1,11 @@
 package chats.data.repository
 
 import android.util.Log
+import androidx.paging.ExperimentalPagingApi
+import androidx.paging.Pager
+import androidx.paging.PagingConfig
+import androidx.paging.PagingData
+import androidx.paging.map
 import androidx.work.ExistingPeriodicWorkPolicy
 import androidx.work.ExistingWorkPolicy
 import androidx.work.WorkManager
@@ -10,6 +15,8 @@ import chats.data.local.database.MessageEntity
 import chats.data.local.mappers.createPendingMessageEntity
 import chats.data.local.mappers.toDomain
 import chats.data.local.mappers.toEntity
+import chats.data.local.paging.MessagePagingSource
+import chats.data.local.paging.MessageRemoteMediator
 import chats.data.remote.api.ChatApi
 import chats.data.remote.api.SendMessageRequest
 import chats.data.remote.dto.MessageDto
@@ -39,6 +46,7 @@ class ChatRepositoryImpl @Inject constructor(
     private val messageDao: MessageDao,
     private val chatDao: ChatDao,
     private val workManager: WorkManager,
+    private val appDatabase: chats.data.local.database.AppDatabase,
     private val hubClient: chats.data.remote.signalr.ChatHubClient
 ) : ChatRepository {
 
@@ -101,6 +109,34 @@ class ChatRepositoryImpl @Inject constructor(
         }
     }
 
+    /**
+     * Получает сообщения с помощью Paging 3 и RemoteMediator
+     */
+    @OptIn(ExperimentalPagingApi::class)
+    override fun getMessagesPagingSource(chatId: String): Flow<PagingData<Message>> {
+        return Pager(
+            config = PagingConfig(
+                pageSize = 30,
+                prefetchDistance = 10,
+                enablePlaceholders = false,
+                initialLoadSize = 60
+            ),
+            pagingSourceFactory = {
+                MessagePagingSource(chatId, messageDao)
+            },
+            remoteMediator = MessageRemoteMediator(
+                chatId = chatId,
+                messageDao = messageDao,
+                chatDao = chatDao,
+                chatApi = api,
+                tokenManager = tokenManager,
+                appDatabase = appDatabase
+            )
+        ).flow.map { pagingData ->
+            pagingData.map { entity -> entity.toDomain() }
+        }
+    }
+
     override suspend fun getMessages(chatId: String, cursor: String?, pivot: Long?, limit: Int?): List<Message> {
         val baseUrl = serverConfig.getBaseUrl().removeSuffix("/api/")
         val currentUserId = tokenManager.getUserId() ?: ""