I configured the server connection and improved the logic

app/src/main/java/ru/myitschool/work/core/Constants.kt

@@ -1,7 +1,7 @@
 package ru.myitschool.work.core
 
 object Constants {
-    const val HOST = "http://10.0.2.2:8080"
+    const val HOST = "http://127.0.0.1:8080"
     const val AUTH_URL = "/auth"
     const val INFO_URL = "/info"
     const val BOOKING_URL = "/booking"

app/src/main/java/ru/myitschool/work/data/repo/BookRepository.kt

@@ -0,0 +1,15 @@
+package ru.myitschool.work.data.repo
+
+import ru.myitschool.work.data.source.NetworkDataSource
+import ru.myitschool.work.ui.screen.Booking
+import ru.myitschool.work.ui.screen.UserInfo
+
+object BookRepository {
+    suspend fun loadBooks(code: String): Result<List<Booking>> {
+        return NetworkDataSource.getFreeBooking(code)
+    }
+
+    suspend fun sendData(code: String, booking: Booking) : Result<Boolean> {
+        return NetworkDataSource.createNewBooking(code, booking)
+    }
+}

app/src/main/java/ru/myitschool/work/data/source/NetworkDataSource.kt

@@ -1,16 +1,23 @@
 package ru.myitschool.work.data.source
 
 import io.ktor.client.HttpClient
+import io.ktor.client.call.body
 import io.ktor.client.engine.cio.CIO
 import io.ktor.client.plugins.contentnegotiation.ContentNegotiation
 import io.ktor.client.request.get
+import io.ktor.client.request.post
 import io.ktor.client.statement.bodyAsText
+import io.ktor.http.ContentType
 import io.ktor.http.HttpStatusCode
+import io.ktor.http.contentType
 import io.ktor.serialization.kotlinx.json.json
+import io.ktor.utils.io.InternalAPI
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.withContext
 import kotlinx.serialization.json.Json
 import ru.myitschool.work.core.Constants
+import ru.myitschool.work.ui.screen.Booking
+import ru.myitschool.work.ui.screen.UserInfo
 
 object NetworkDataSource {
     private val client by lazy {
@@ -31,6 +38,40 @@ object NetworkDataSource {
     suspend fun checkAuth(code: String): Result<Boolean> = withContext(Dispatchers.IO) {
         return@withContext runCatching {
             val response = client.get(getUrl(code, Constants.AUTH_URL))
+            when (response.status) {
+                HttpStatusCode.OK -> true
+                else -> error("Неверный код для авторизации")
+            }
+        }
+    }
+
+    suspend fun getInfo(code: String): Result<UserInfo> = withContext(Dispatchers.IO){
+        return@withContext runCatching {
+            val response = client.get(getUrl(code, Constants.INFO_URL))
+            when(response.status){
+                HttpStatusCode.OK -> response.body()
+                else -> error("Ошибка получения данных")
+            }
+        }
+    }
+
+    suspend fun getFreeBooking(code: String) : Result<List<Booking>> = withContext(Dispatchers.IO) {
+        return@withContext runCatching {
+            val response = client.get(getUrl(code, Constants.BOOKING_URL))
+            when (response.status) {
+                HttpStatusCode.OK -> response.body()
+                else -> error(response.bodyAsText())
+            }
+        }
+    }
+
+    @OptIn(InternalAPI::class)
+    suspend fun createNewBooking(code: String, booking: Booking) : Result<Boolean> = withContext(Dispatchers.IO) {
+        return@withContext runCatching {
+            val response = client.post(getUrl(code, Constants.BOOK_URL)) {
+                contentType(ContentType.Application.Json)
+                body = booking
+            }
             when (response.status) {
                 HttpStatusCode.OK -> true
                 else -> error(response.bodyAsText())

app/src/main/java/ru/myitschool/work/ui/screen/BookingUserInfo.kt

@@ -0,0 +1,16 @@
+package ru.myitschool.work.ui.screen
+
+import kotlinx.serialization.Serializable
+
+@Serializable
+data class UserInfo(
+    val name: String,
+    val photo: String? = null,
+    val bookings: List<Booking>
+)
+
+@Serializable
+data class Booking(
+    val date: String,
+    val place: String
+)

app/src/main/java/ru/myitschool/work/ui/screen/NavigationGraph.kt

@@ -7,6 +7,7 @@ import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
+import androidx.lifecycle.viewmodel.compose.viewModel
 import androidx.navigation.NavHostController
 import androidx.navigation.compose.NavHost
 import androidx.navigation.compose.composable
@@ -15,6 +16,8 @@ import ru.myitschool.work.ui.nav.AuthScreenDestination
 import ru.myitschool.work.ui.nav.BookScreenDestination
 import ru.myitschool.work.ui.nav.MainScreenDestination
 import ru.myitschool.work.ui.screen.auth.AuthScreen
+import ru.myitschool.work.ui.screen.book.BookScreen
+import ru.myitschool.work.ui.screen.book.BookViewModel
 
 @Composable
 fun AppNavHost(
@@ -39,11 +42,10 @@ fun AppNavHost(
             }
         }
         composable<BookScreenDestination> {
-            Box(
-                contentAlignment = Alignment.Center
-            ) {
-                Text(text = "Hello")
-            }
+            BookScreen(
+                viewModel = BookViewModel(),
+                navController = navController
+            )
         }
     }
 }

app/src/main/java/ru/myitschool/work/ui/screen/book/BookIntent.kt

@@ -0,0 +1,10 @@
+package ru.myitschool.work.ui.screen.book
+
+import ru.myitschool.work.ui.screen.Booking
+
+sealed interface BookIntent {
+    data class Send(val code : String, val booking: Booking) : BookIntent
+    data object BackToMainScreen : BookIntent
+    data object ToAuthScreen : BookIntent
+    data object LoadData : BookIntent
+}

app/src/main/java/ru/myitschool/work/ui/screen/book/BookScreen.kt

@@ -0,0 +1,209 @@
+package ru.myitschool.work.ui.screen.book;
+
+import android.util.Log
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.lazy.LazyColumn
+import androidx.compose.foundation.selection.selectableGroup
+import androidx.compose.material3.Button
+import androidx.compose.material3.CircularProgressIndicator
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.NavigationBar
+import androidx.compose.material3.NavigationBarItem
+import androidx.compose.material3.RadioButton
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.MutableState
+import androidx.compose.runtime.collectAsState
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.platform.testTag
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.unit.dp
+import androidx.lifecycle.viewmodel.compose.viewModel
+import androidx.navigation.NavController
+import ru.myitschool.work.R
+import ru.myitschool.work.core.TestIds
+import ru.myitschool.work.data.repo.AuthRepository
+import ru.myitschool.work.ui.nav.AuthScreenDestination
+import ru.myitschool.work.ui.nav.MainScreenDestination
+import ru.myitschool.work.ui.screen.Booking
+
+var selectedTime: MutableState<String?> = mutableStateOf(null)
+var selectedBooking: MutableState<Booking?> = mutableStateOf(null)
+var currentTime: MutableState<String?> = mutableStateOf(null)
+@Composable
+fun BookScreen(
+    viewModel: BookViewModel = viewModel(),
+    navController: NavController,
+    modifier: Modifier = Modifier
+) {
+    val state by viewModel.uiState.collectAsState()
+
+    LaunchedEffect(Unit) {
+        Log.d("BookScreen", "1")
+        viewModel.navigationFlow.collect {
+            // TODO настроить наконец это переход между экранами
+//            Log.d("BookScreen", "2")
+            when (it) {
+                BookNavigationEvent.NavigateToMain -> {
+                    Log.d("BookScreen", "3")
+                    navController.navigate(MainScreenDestination)
+                }
+                BookNavigationEvent.NavigateToAuth -> {
+                    Log.d("BookScreen", "4")
+                    navController.navigate(AuthScreenDestination) {
+                        Log.d("BookScreen", "5")
+                        popUpTo(navController.graph.startDestinationId) {
+                            Log.d("BookScreen", "6")
+                            inclusive = true
+                        }
+                    }
+                }
+            }
+        }
+    }
+
+    Column(
+        modifier = modifier.fillMaxSize()
+    ) {
+//        Text("" + selectedTime.value  + "," + currentTime.value + "," + selectedBooking.value)
+        when (state) {
+            is BookState.Data -> {
+                val options = (state as BookState.Data).booking
+                if (currentTime.value == null)
+                    for (el in options) {
+                        currentTime.value = el.key
+                        break
+                    }
+                TabGroup(options.keys)
+                options[currentTime.value]?.let { SelectBooking(it) }
+
+                Button(
+                    onClick = {
+                        viewModel.onIntent(BookIntent.Send(AuthRepository.getSavedCode()!!, selectedBooking.value!!))
+                    },
+                    modifier = Modifier
+                        .testTag(TestIds.Book.BOOK_BUTTON),
+                    enabled = selectedBooking.value != null
+                ) {
+                    Text(stringResource(R.string.to_book))
+                }
+            }
+
+            is BookState.Error -> {
+                Text(
+                    text = (state as BookState.Error).error,
+                    color = MaterialTheme.colorScheme.error,
+                    modifier = Modifier
+                        .testTag(TestIds.Book.ERROR)
+                )
+
+                Button(
+                    onClick = {
+                        viewModel.onIntent(BookIntent.LoadData)
+                    },
+                    modifier = Modifier
+                        .testTag(TestIds.Book.REFRESH_BUTTON)
+                ) {
+                    Text(stringResource(R.string.upadate)) // А что сюда писать?
+                }
+            }
+
+            BookState.Loading -> {
+                CircularProgressIndicator(
+                    modifier = Modifier
+                        .align(Alignment.CenterHorizontally)
+                        .size(64.dp)
+                )
+            }
+
+            BookState.NotData -> {
+                Text(
+                    text = stringResource(R.string.not_book),
+                    modifier = Modifier
+                        .testTag(TestIds.Book.EMPTY)
+                )
+            }
+        }
+        Button(
+            onClick = {
+                viewModel.onIntent(BookIntent.BackToMainScreen)
+            },
+            modifier = Modifier
+                .testTag(TestIds.Book.BACK_BUTTON)
+        ) {
+            Text(stringResource(R.string.back))
+        }
+    }
+}
+
+
+@Composable
+fun TabGroup(options: Set<String>) {
+    NavigationBar(
+        Modifier.fillMaxWidth()
+    ) {
+        options.forEachIndexed { index, label ->
+            NavigationBarItem(
+                selected = currentTime.value == label,
+                onClick = {
+                    currentTime.value = label
+                },
+                icon = {
+                    Text(
+                        text = label,
+                        modifier = Modifier
+                            .testTag(TestIds.Book.ITEM_DATE)
+                    )
+                       },
+                modifier = Modifier
+                    .testTag(TestIds.Book.getIdDateItemByPosition(index))
+            )
+        }
+    }
+}
+
+@Composable
+fun SelectBooking(options: List<Booking>) {
+    LazyColumn(
+        Modifier
+            .fillMaxWidth()
+    ) {
+        options.forEachIndexed { index, book ->
+            item {
+                Row(
+                    Modifier
+                        .fillMaxWidth()
+                        .selectableGroup()
+                        .testTag(TestIds.Book.getIdPlaceItemByPosition(index)),
+                    horizontalArrangement = Arrangement.SpaceBetween,
+                    verticalAlignment = Alignment.CenterVertically
+                ) {
+                    Text(
+                        text = book.place,
+                        modifier = Modifier
+                            .testTag(TestIds.Book.ITEM_PLACE_TEXT)
+                    )
+                    RadioButton(
+                        selected = book == selectedBooking.value && currentTime.value == selectedTime.value,
+                        onClick = {
+                            selectedBooking.value = book
+                            selectedTime.value = currentTime.value
+                                  },
+                        modifier = Modifier
+                            .testTag(TestIds.Book.ITEM_PLACE_SELECTOR)
+                    )
+                }
+            }
+        }
+    }
+}
+

app/src/main/java/ru/myitschool/work/ui/screen/book/BookState.kt

@@ -0,0 +1,14 @@
+package ru.myitschool.work.ui.screen.book
+
+import ru.myitschool.work.ui.screen.Booking
+
+sealed interface BookState {
+    object Loading: BookState
+    data class Data(
+        val booking : Map<String, List<Booking>> = mapOf()
+    ): BookState
+    data class Error(
+        val error : String
+    ): BookState
+    object NotData : BookState
+}

app/src/main/java/ru/myitschool/work/ui/screen/book/BookViewModel.kt

@@ -0,0 +1,125 @@
+package ru.myitschool.work.ui.screen.book
+
+import android.util.Log
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.viewModelScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.flow.MutableSharedFlow
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.SharedFlow
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.asStateFlow
+import kotlinx.coroutines.flow.update
+import kotlinx.coroutines.launch
+import ru.myitschool.work.data.repo.AuthRepository
+import ru.myitschool.work.data.repo.BookRepository
+import ru.myitschool.work.ui.screen.Booking
+
+class BookViewModel : ViewModel() {
+    private val _uiState = MutableStateFlow<BookState>(BookState.Loading)
+    val uiState: StateFlow<BookState> = _uiState.asStateFlow();
+
+    private val _actionFlow: MutableSharedFlow<Unit> = MutableSharedFlow()
+    val actionFlow: SharedFlow<Unit> = _actionFlow
+    private val _navigationFlow = MutableSharedFlow<BookNavigationEvent>()
+    val navigationFlow: SharedFlow<BookNavigationEvent> = _navigationFlow
+
+    init {
+        loadData()
+    }
+
+    private fun loadData() {
+        _uiState.update { BookState.Loading }
+        viewModelScope.launch(Dispatchers.IO) {
+            val code = AuthRepository.getSavedCode() ?: run {
+                onIntent(BookIntent.ToAuthScreen)
+                Log.d("", "Go to AuthScreen")
+                return@launch
+            }
+            Log.d("", "Проверка")
+//            _uiState.update {
+//                BookState.Data(
+//                    listOf(
+//                        Booking(
+//                            "19.04",
+//                            "Рабочее место у окна"
+//                        ),
+//                        Booking(
+//                            "19.04",
+//                            "Переговорная комната № 1"
+//                        ),
+//                        Booking(
+//                            "19.04",
+//                            "Коворкинг А"
+//                        ),
+//                        Booking(
+//                            "20.04",
+//                            "Кабинет № 33"
+//                        ),
+//                    ).toMap()
+//                )
+//            }
+            BookRepository.loadBooks(code).fold(
+                onSuccess = {
+                    it.let { bookings ->
+                        _uiState.update {
+                            when (bookings.isEmpty()) {
+                                true -> BookState.Data(
+                                    booking = bookings.toMap()
+                                )
+                                false -> BookState.NotData
+                            }
+                        }
+                    }
+                },
+                onFailure = { error ->
+                    _uiState.update {
+                        BookState.Error(
+                            error = error.message ?: "Не удалось загрузить данные"
+                        )
+                    }
+                }
+            )
+        }
+    }
+
+    fun onIntent(intent: BookIntent) {
+        when (intent) {
+            is BookIntent.Send -> {
+                viewModelScope.launch(Dispatchers.Default) {
+                    _uiState.update { BookState.Loading }
+                    BookRepository.sendData(intent.code, intent.booking).fold(
+                        onSuccess = {
+                            _actionFlow.emit(Unit)
+                        },
+                        onFailure = { error ->
+                            BookState.Error(error.message ?: "Неизвестная ошибка")
+                        }
+                    )
+                }
+            }
+            BookIntent.BackToMainScreen -> {
+                _navigationFlow.tryEmit(BookNavigationEvent.NavigateToMain)
+            }
+            BookIntent.LoadData -> loadData()
+            BookIntent.ToAuthScreen -> {
+                _navigationFlow.tryEmit(BookNavigationEvent.NavigateToAuth)
+            }
+        }
+    }
+}
+
+fun List<Booking>.toMap() : Map<String, List<Booking>> {
+    val options = this
+    val map : MutableMap<String, MutableList<Booking>> = mutableMapOf()
+    options.forEach {
+        if (map[it.date] == null) map[it.date] = mutableListOf(it)
+        else map[it.date]?.add(it)
+    }
+    return map
+}
+
+sealed interface BookNavigationEvent {
+    object NavigateToAuth : BookNavigationEvent
+    object NavigateToMain : BookNavigationEvent
+}

app/src/main/res/values/strings.xml

@@ -4,4 +4,8 @@
     <string name="auth_title">Привет! Введи код для авторизации</string>
     <string name="auth_label">Код</string>
     <string name="auth_sign_in">Войти</string>
+    <string name="to_book">забронировать</string>
+    <string name="back">Назад</string>
+    <string name="not_book">Всё забранировано</string>
+    <string name="upadate">Обновить</string>
 </resources>