solve

app/src/main/AndroidManifest.xml

@@ -19,6 +19,7 @@
             android:name=".ui.root.RootActivity"
             android:exported="true"
             android:windowSoftInputMode="adjustResize"
+            android:screenOrientation="portrait"
             android:label="@string/title_activity_root">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />

app/src/main/java/ru/myitschool/work/data/model/BookRequestDto.kt

@@ -0,0 +1,12 @@
+package ru.myitschool.work.data.model
+
+import kotlinx.serialization.SerialName
+import kotlinx.serialization.Serializable
+
+@Serializable
+data class BookRequestDto(
+    @SerialName("date")
+    val date: String,
+    @SerialName("placeId")
+    val placeId: Int
+)

app/src/main/java/ru/myitschool/work/data/model/BookingAvailabilityDto.kt

@@ -0,0 +1,8 @@
+package ru.myitschool.work.data.model
+
+import kotlinx.serialization.Serializable
+
+@Serializable
+data class BookingAvailabilityDto(
+    val entries: Map<String, List<BookingOptionDto>>
+)

app/src/main/java/ru/myitschool/work/data/model/BookingOptionDto.kt

@@ -0,0 +1,9 @@
+package ru.myitschool.work.data.model
+
+import kotlinx.serialization.Serializable
+
+@Serializable
+data class BookingOptionDto(
+    val id: Int,
+    val place: String
+)

app/src/main/java/ru/myitschool/work/data/model/UserInfoDto.kt

@@ -0,0 +1,18 @@
+package ru.myitschool.work.data.model
+
+import kotlinx.serialization.SerialName
+import kotlinx.serialization.Serializable
+
+@Serializable
+data class UserInfoDto(
+    val name: String,
+    @SerialName("photoUrl")
+    val photoUrl: String,
+    val booking: Map<String, UserBookingDto> = emptyMap()
+)
+
+@Serializable
+data class UserBookingDto(
+    val id: Int,
+    val place: String
+)

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

@@ -1,16 +1,48 @@
 package ru.myitschool.work.data.repo
 
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.SupervisorJob
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.asStateFlow
+import kotlinx.coroutines.launch
 import ru.myitschool.work.data.source.NetworkDataSource
+import ru.myitschool.work.data.storage.AuthLocalDataSource
 
 object AuthRepository {
 
-    private var codeCache: String? = null
+    private val scope = CoroutineScope(SupervisorJob() + Dispatchers.IO)
+    private val _codeState: MutableStateFlow<String?> = MutableStateFlow(null)
+    val codeState: StateFlow<String?> = _codeState.asStateFlow()
 
-    suspend fun checkAndSave(text: String): Result<Boolean> {
-        return NetworkDataSource.checkAuth(text).onSuccess { success ->
-            if (success) {
-                codeCache = text
+    init {
+        scope.launch {
+            AuthLocalDataSource.codeFlow.collect { storedCode ->
+                _codeState.value = storedCode
             }
         }
     }
+
+    suspend fun checkAndSave(text: String): Result<Unit> {
+        return NetworkDataSource.checkAuth(text).onSuccess {
+            AuthLocalDataSource.saveCode(text)
+            _codeState.value = text
+        }
+    }
+
+    suspend fun getCurrentCode(): String? {
+        val cached = _codeState.value
+        if (cached != null) return cached
+        val loaded = AuthLocalDataSource.currentCode()
+        if (loaded != null) {
+            _codeState.value = loaded
+        }
+        return loaded
+    }
+
+    suspend fun clear() {
+        AuthLocalDataSource.clear()
+        _codeState.value = null
+    }
 }

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

@@ -0,0 +1,16 @@
+package ru.myitschool.work.data.repo
+
+import ru.myitschool.work.data.model.BookRequestDto
+import ru.myitschool.work.data.model.BookingOptionDto
+import ru.myitschool.work.data.source.NetworkDataSource
+
+object BookingRepository {
+
+    suspend fun fetchAvailability(code: String): Result<Map<String, List<BookingOptionDto>>> {
+        return NetworkDataSource.fetchBookingAvailability(code)
+    }
+
+    suspend fun createBooking(code: String, date: String, placeId: Int): Result<Unit> {
+        return NetworkDataSource.createBooking(code, BookRequestDto(date = date, placeId = placeId))
+    }
+}

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

@@ -0,0 +1,10 @@
+package ru.myitschool.work.data.repo
+
+import ru.myitschool.work.data.model.UserInfoDto
+import ru.myitschool.work.data.source.NetworkDataSource
+
+object UserRepository {
+    suspend fun fetchUserInfo(code: String): Result<UserInfoDto> {
+        return NetworkDataSource.fetchUserInfo(code)
+    }
+}

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

@@ -1,16 +1,24 @@
 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.request.setBody
 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 kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.withContext
 import kotlinx.serialization.json.Json
 import ru.myitschool.work.core.Constants
+import ru.myitschool.work.data.model.BookRequestDto
+import ru.myitschool.work.data.model.BookingOptionDto
+import ru.myitschool.work.data.model.UserInfoDto
 
 object NetworkDataSource {
     private val client by lazy {
@@ -28,11 +36,44 @@ object NetworkDataSource {
         }
     }
 
-    suspend fun checkAuth(code: String): Result<Boolean> = withContext(Dispatchers.IO) {
+    suspend fun checkAuth(code: String): Result<Unit> = withContext(Dispatchers.IO) {
         return@withContext runCatching {
             val response = client.get(getUrl(code, Constants.AUTH_URL))
             when (response.status) {
-                HttpStatusCode.OK -> true
+                HttpStatusCode.OK -> Unit
+                else -> error(response.bodyAsText())
+            }
+        }
+    }
+
+    suspend fun fetchUserInfo(code: String): Result<UserInfoDto> = withContext(Dispatchers.IO) {
+        return@withContext runCatching {
+            val response = client.get(getUrl(code, Constants.INFO_URL))
+            when (response.status) {
+                HttpStatusCode.OK -> response.body()
+                else -> error(response.bodyAsText())
+            }
+        }
+    }
+
+    suspend fun fetchBookingAvailability(code: String): Result<Map<String, List<BookingOptionDto>>> = 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())
+            }
+        }
+    }
+
+    suspend fun createBooking(code: String, request: BookRequestDto): Result<Unit> = withContext(Dispatchers.IO) {
+        return@withContext runCatching {
+            val response = client.post(getUrl(code, Constants.BOOK_URL)) {
+                contentType(ContentType.Application.Json)
+                setBody(request)
+            }
+            when (response.status) {
+                HttpStatusCode.Created -> Unit
                 else -> error(response.bodyAsText())
             }
         }

app/src/main/java/ru/myitschool/work/data/storage/AuthLocalDataSource.kt

@@ -0,0 +1,33 @@
+package ru.myitschool.work.data.storage
+
+import androidx.datastore.preferences.core.edit
+import androidx.datastore.preferences.core.stringPreferencesKey
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.firstOrNull
+import kotlinx.coroutines.flow.map
+
+object AuthLocalDataSource {
+
+    private val codeKey = stringPreferencesKey("auth_code")
+
+    val codeFlow: Flow<String?> = SettingsDataStore.dataStore.data
+        .map { preferences -> preferences[codeKey] }
+
+    suspend fun saveCode(code: String) {
+        SettingsDataStore.dataStore.edit { preferences ->
+            preferences[codeKey] = code
+        }
+    }
+
+    suspend fun clear() {
+        SettingsDataStore.dataStore.edit { preferences ->
+            preferences.remove(codeKey)
+        }
+    }
+
+    suspend fun currentCode(): String? {
+        return SettingsDataStore.dataStore.data
+            .map { it[codeKey] }
+            .firstOrNull()
+    }
+}

app/src/main/java/ru/myitschool/work/data/storage/SettingsDataStore.kt

@@ -0,0 +1,15 @@
+package ru.myitschool.work.data.storage
+
+import android.content.Context
+import androidx.datastore.core.DataStore
+import androidx.datastore.preferences.core.Preferences
+import androidx.datastore.preferences.preferencesDataStore
+import ru.myitschool.work.App
+
+private val Context.authDataStore by preferencesDataStore(name = "auth_settings")
+
+object SettingsDataStore {
+    val dataStore: DataStore<Preferences> by lazy {
+        App.context.authDataStore
+    }
+}

app/src/main/java/ru/myitschool/work/domain/auth/CheckAndSaveAuthCodeUseCase.kt

@@ -5,11 +5,7 @@ import ru.myitschool.work.data.repo.AuthRepository
 class CheckAndSaveAuthCodeUseCase(
     private val repository: AuthRepository
 ) {
-    suspend operator fun invoke(
-        text: String
-    ): Result<Unit> {
-        return repository.checkAndSave(text).mapCatching { success ->
-            if (!success) error("Code is incorrect")
-        }
+    suspend operator fun invoke(text: String): Result<Unit> {
+        return repository.checkAndSave(text)
     }
 }

app/src/main/java/ru/myitschool/work/ui/nav/NavResults.kt

@@ -0,0 +1,3 @@
+package ru.myitschool.work.ui.nav
+
+const val BOOKING_RESULT_KEY = "booking_result"

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

@@ -2,10 +2,7 @@ package ru.myitschool.work.ui.screen
 
 import androidx.compose.animation.EnterTransition
 import androidx.compose.animation.ExitTransition
-import androidx.compose.foundation.layout.Box
-import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
-import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.navigation.NavHostController
 import androidx.navigation.compose.NavHost
@@ -15,6 +12,8 @@ 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.main.MainScreen
 
 @Composable
 fun AppNavHost(
@@ -32,18 +31,10 @@ fun AppNavHost(
             AuthScreen(navController = navController)
         }
         composable<MainScreenDestination> {
-            Box(
-                contentAlignment = Alignment.Center
-            ) {
-                Text(text = "Hello")
-            }
+            MainScreen(navController = navController)
         }
         composable<BookScreenDestination> {
-            Box(
-                contentAlignment = Alignment.Center
-            ) {
-                Text(text = "Hello")
-            }
+            BookScreen(navController = navController)
         }
     }
 }

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

@@ -0,0 +1,5 @@
+package ru.myitschool.work.ui.screen.auth
+
+sealed interface AuthAction {
+    data object NavigateToMain : AuthAction
+}

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

@@ -1,6 +1,6 @@
 package ru.myitschool.work.ui.screen.auth
 
 sealed interface AuthIntent {
-    data class Send(val text: String): AuthIntent
     data class TextInput(val text: String): AuthIntent
+    data object Send: AuthIntent
 }

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

@@ -10,28 +10,30 @@ import androidx.compose.foundation.layout.size
 import androidx.compose.material3.Button
 import androidx.compose.material3.CircularProgressIndicator
 import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.OutlinedTextField
 import androidx.compose.material3.Text
-import androidx.compose.material3.TextField
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
 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.compose.ui.Alignment
 import androidx.compose.ui.Modifier
-import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.platform.testTag
 import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.text.input.ImeAction
+import androidx.compose.ui.text.input.KeyboardType
 import androidx.compose.ui.text.style.TextAlign
 import androidx.compose.ui.unit.dp
+import androidx.compose.foundation.text.KeyboardOptions
 import androidx.lifecycle.viewmodel.compose.viewModel
 import androidx.navigation.NavController
+import kotlinx.coroutines.flow.collectLatest
 import ru.myitschool.work.R
 import ru.myitschool.work.core.TestIds
 import ru.myitschool.work.ui.nav.MainScreenDestination
 
+private val CODE_REGEX = Regex("^[A-Za-z0-9]{4}$")
+
 @Composable
 fun AuthScreen(
     viewModel: AuthViewModel = viewModel(),
@@ -40,11 +42,22 @@ fun AuthScreen(
     val state by viewModel.uiState.collectAsState()
 
     LaunchedEffect(Unit) {
-        viewModel.actionFlow.collect {
-            navController.navigate(MainScreenDestination)
+        viewModel.actionFlow.collectLatest {
+            when (it) {
+                AuthAction.NavigateToMain -> {
+                    navController.navigate(MainScreenDestination) {
+                        popUpTo(MainScreenDestination) { inclusive = true }
+                    }
+                }
+            }
         }
     }
 
+    if (state.isCheckingSavedCode) {
+        BoxLoading()
+        return
+    }
+
     Column(
         modifier = Modifier
             .fillMaxSize()
@@ -57,41 +70,66 @@ fun AuthScreen(
             style = MaterialTheme.typography.headlineSmall,
             textAlign = TextAlign.Center
         )
-        when (val currentState = state) {
-            is AuthState.Data -> Content(viewModel, currentState)
-            is AuthState.Loading -> {
-                CircularProgressIndicator(
-                    modifier = Modifier.size(64.dp)
-                )
-            }
-        }
+        Spacer(modifier = Modifier.size(24.dp))
+        Content(viewModel = viewModel, state = state)
     }
 }
 
 @Composable
 private fun Content(
     viewModel: AuthViewModel,
-    state: AuthState.Data
+    state: AuthUiState
 ) {
-    var inputText by remember { mutableStateOf("") }
-    Spacer(modifier = Modifier.size(16.dp))
-    TextField(
-        modifier = Modifier.testTag(TestIds.Auth.CODE_INPUT).fillMaxWidth(),
-        value = inputText,
-        onValueChange = {
-            inputText = it
-            viewModel.onIntent(AuthIntent.TextInput(it))
-        },
-        label = { Text(stringResource(R.string.auth_label)) }
+    val isCodeValidForButton = state.code.length == 4 && CODE_REGEX.matches(state.code)
+
+    OutlinedTextField(
+        modifier = Modifier
+            .testTag(TestIds.Auth.CODE_INPUT)
+            .fillMaxWidth(),
+        value = state.code,
+        onValueChange = { viewModel.onIntent(AuthIntent.TextInput(it)) },
+        label = { Text(stringResource(R.string.auth_label)) },
+        placeholder = { Text(stringResource(R.string.auth_label)) },
+        singleLine = true,
+        enabled = !state.isLoading,
+        keyboardOptions = KeyboardOptions(
+            keyboardType = KeyboardType.Ascii,
+            imeAction = ImeAction.Done
+        )
     )
+    if (state.showError) {
+        Spacer(modifier = Modifier.size(8.dp))
+        Text(
+            text = stringResource(R.string.auth_error_text),
+            modifier = Modifier.testTag(TestIds.Auth.ERROR),
+            color = MaterialTheme.colorScheme.error
+        )
+    }
     Spacer(modifier = Modifier.size(16.dp))
     Button(
-        modifier = Modifier.testTag(TestIds.Auth.SIGN_BUTTON).fillMaxWidth(),
-        onClick = {
-            viewModel.onIntent(AuthIntent.Send(inputText))
-        },
-        enabled = true
+        modifier = Modifier
+            .testTag(TestIds.Auth.SIGN_BUTTON)
+            .fillMaxWidth(),
+        onClick = { viewModel.onIntent(AuthIntent.Send) },
+        enabled = !state.isLoading && isCodeValidForButton
     ) {
-        Text(stringResource(R.string.auth_sign_in))
+        if (state.isLoading) {
+            CircularProgressIndicator(modifier = Modifier.size(20.dp))
+        } else {
+            Text(stringResource(R.string.auth_sign_in))
+        }
+    }
+}
+
+@Composable
+private fun BoxLoading() {
+    Column(
+        modifier = Modifier
+            .fillMaxSize()
+            .padding(24.dp),
+        verticalArrangement = Arrangement.Center,
+        horizontalAlignment = Alignment.CenterHorizontally
+    ) {
+        CircularProgressIndicator(modifier = Modifier.size(48.dp))
     }
 }

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

@@ -1,6 +1,8 @@
 package ru.myitschool.work.ui.screen.auth
 
-sealed interface AuthState {
-    object Loading: AuthState
-    object Data: AuthState
-}
+data class AuthUiState(
+    val code: String = "",
+    val isLoading: Boolean = false,
+    val showError: Boolean = false,
+    val isCheckingSavedCode: Boolean = true
+)

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

@@ -12,32 +12,69 @@ import kotlinx.coroutines.flow.update
 import kotlinx.coroutines.launch
 import ru.myitschool.work.data.repo.AuthRepository
 import ru.myitschool.work.domain.auth.CheckAndSaveAuthCodeUseCase
+import ru.myitschool.work.ui.screen.auth.AuthIntent.Send
+import ru.myitschool.work.ui.screen.auth.AuthIntent.TextInput
 
 class AuthViewModel : ViewModel() {
     private val checkAndSaveAuthCodeUseCase by lazy { CheckAndSaveAuthCodeUseCase(AuthRepository) }
-    private val _uiState = MutableStateFlow<AuthState>(AuthState.Data)
-    val uiState: StateFlow<AuthState> = _uiState.asStateFlow()
+    private val _uiState = MutableStateFlow(AuthUiState())
+    val uiState: StateFlow<AuthUiState> = _uiState.asStateFlow()
 
-    private val _actionFlow: MutableSharedFlow<Unit> = MutableSharedFlow()
-    val actionFlow: SharedFlow<Unit> = _actionFlow
+    private val _actionFlow: MutableSharedFlow<AuthAction> = MutableSharedFlow()
+    val actionFlow: SharedFlow<AuthAction> = _actionFlow
+
+    init {
+        viewModelScope.launch(Dispatchers.IO) {
+            val savedCode = AuthRepository.getCurrentCode()
+            if (savedCode != null) {
+                _actionFlow.emit(AuthAction.NavigateToMain)
+            } else {
+                _uiState.update { it.copy(isCheckingSavedCode = false) }
+            }
+        }
+    }
 
     fun onIntent(intent: AuthIntent) {
         when (intent) {
-            is AuthIntent.Send -> {
-                viewModelScope.launch(Dispatchers.Default) {
-                    _uiState.update { AuthState.Loading }
-                    checkAndSaveAuthCodeUseCase.invoke("9999").fold(
-                        onSuccess = {
-                            _actionFlow.emit(Unit)
-                        },
-                        onFailure = { error ->
-                            error.printStackTrace()
-                            _actionFlow.emit(Unit)
-                        }
-                    )
-                }
-            }
-            is AuthIntent.TextInput -> Unit
+            is TextInput -> onTextChanged(intent.text)
+            Send -> onSendClicked()
         }
     }
+
+    private fun onTextChanged(text: String) {
+        _uiState.update {
+            it.copy(
+                code = text,
+                showError = false
+            )
+        }
+    }
+
+    private fun onSendClicked() {
+        val code = _uiState.value.code
+        if (!isCodeValid(code)) {
+            _uiState.update { it.copy(showError = true) }
+            return
+        }
+
+        viewModelScope.launch(Dispatchers.IO) {
+            _uiState.update { it.copy(isLoading = true) }
+            checkAndSaveAuthCodeUseCase.invoke(code).fold(
+                onSuccess = {
+                    _uiState.update { state -> state.copy(isLoading = false, showError = false) }
+                    _actionFlow.emit(AuthAction.NavigateToMain)
+                },
+                onFailure = {
+                    _uiState.update { state -> state.copy(isLoading = false, showError = true) }
+                }
+            )
+        }
+    }
+
+    private fun isCodeValid(code: String): Boolean {
+        if (code.length != 4) return false
+        if (code.isBlank()) return false
+        val regex = "^[A-Za-z0-9]{4}$".toRegex()
+        return regex.matches(code)
+    }
 }

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

@@ -0,0 +1,279 @@
+package ru.myitschool.work.ui.screen.book
+
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.width
+import androidx.compose.foundation.lazy.LazyColumn
+import androidx.compose.foundation.lazy.itemsIndexed
+import androidx.compose.foundation.selection.selectable
+import androidx.compose.material3.Button
+import androidx.compose.material3.CircularProgressIndicator
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.RadioButton
+import androidx.compose.material3.ScrollableTabRow
+import androidx.compose.material3.Surface
+import androidx.compose.material3.Tab
+import androidx.compose.material3.Text
+import androidx.compose.material3.TextButton
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.collectAsState
+import androidx.compose.runtime.getValue
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.platform.testTag
+import androidx.compose.ui.semantics.Role
+import androidx.compose.ui.text.style.TextAlign
+import androidx.compose.ui.unit.dp
+import androidx.lifecycle.viewmodel.compose.viewModel
+import androidx.navigation.NavController
+import kotlinx.coroutines.flow.collectLatest
+import ru.myitschool.work.R
+import ru.myitschool.work.core.TestIds
+import ru.myitschool.work.ui.nav.AuthScreenDestination
+import ru.myitschool.work.ui.nav.BOOKING_RESULT_KEY
+import androidx.compose.ui.res.stringResource
+
+@Composable
+fun BookScreen(
+    navController: NavController,
+    viewModel: BookingViewModel = viewModel()
+) {
+    val state by viewModel.uiState.collectAsState()
+
+    LaunchedEffect(Unit) {
+        viewModel.actionFlow.collectLatest { action ->
+            when (action) {
+                BookingAction.NavigateToAuth -> {
+                    navController.navigate(AuthScreenDestination) {
+                        popUpTo(AuthScreenDestination) { inclusive = true }
+                    }
+                }
+
+                BookingAction.CloseWithSuccess -> {
+                    navController.previousBackStackEntry
+                        ?.savedStateHandle
+                        ?.set(BOOKING_RESULT_KEY, true)
+                    navController.popBackStack()
+                }
+            }
+        }
+    }
+
+    when {
+        state.isLoading -> BookLoading()
+        state.showError -> BookError(
+            onRefresh = { viewModel.onIntent(BookingIntent.Refresh) },
+            onBack = { navController.popBackStack() }
+        )
+        state.showEmpty -> BookEmpty(onBack = { navController.popBackStack() })
+        else -> BookContent(
+            state = state,
+            onSelectDate = { viewModel.onIntent(BookingIntent.SelectDate(it)) },
+            onSelectPlace = { viewModel.onIntent(BookingIntent.SelectPlace(it)) },
+            onBook = { viewModel.onIntent(BookingIntent.Book) },
+            onBack = { navController.popBackStack() }
+        )
+    }
+}
+
+@Composable
+private fun BookLoading() {
+    Column(
+        modifier = Modifier
+            .fillMaxSize()
+            .padding(24.dp),
+        verticalArrangement = Arrangement.Center,
+        horizontalAlignment = Alignment.CenterHorizontally
+    ) {
+        CircularProgressIndicator()
+    }
+}
+
+@Composable
+private fun BookError(onRefresh: () -> Unit, onBack: () -> Unit) {
+    Column(
+        modifier = Modifier
+            .fillMaxSize()
+            .padding(24.dp),
+        verticalArrangement = Arrangement.Center,
+        horizontalAlignment = Alignment.CenterHorizontally
+    ) {
+        Text(
+            modifier = Modifier.testTag(TestIds.Book.ERROR),
+            text = stringResource(R.string.book_error_text),
+            textAlign = TextAlign.Center,
+            style = MaterialTheme.typography.bodyLarge
+        )
+        Spacer(modifier = Modifier.height(16.dp))
+        Button(
+            modifier = Modifier
+                .fillMaxWidth()
+                .testTag(TestIds.Book.REFRESH_BUTTON),
+            onClick = onRefresh
+        ) {
+            Text(text = stringResource(R.string.book_refresh))
+        }
+        Spacer(modifier = Modifier.height(8.dp))
+        Button(
+            modifier = Modifier
+                .fillMaxWidth()
+                .testTag(TestIds.Book.BACK_BUTTON),
+            onClick = onBack
+        ) {
+            Text(text = stringResource(R.string.book_back))
+        }
+    }
+}
+
+@Composable
+private fun BookEmpty(onBack: () -> Unit) {
+    Column(
+        modifier = Modifier
+            .fillMaxSize()
+            .padding(24.dp),
+        verticalArrangement = Arrangement.Center,
+        horizontalAlignment = Alignment.CenterHorizontally
+    ) {
+        Text(
+            modifier = Modifier.testTag(TestIds.Book.EMPTY),
+            text = stringResource(R.string.book_empty),
+            textAlign = TextAlign.Center,
+            style = MaterialTheme.typography.bodyLarge
+        )
+        Spacer(modifier = Modifier.height(16.dp))
+        Button(
+            modifier = Modifier
+                .fillMaxWidth()
+                .testTag(TestIds.Book.BACK_BUTTON),
+            onClick = onBack
+        ) {
+            Text(text = stringResource(R.string.book_back))
+        }
+    }
+}
+
+@Composable
+private fun BookContent(
+    state: BookingUiState,
+    onSelectDate: (Int) -> Unit,
+    onSelectPlace: (Int) -> Unit,
+    onBook: () -> Unit,
+    onBack: () -> Unit
+) {
+    Column(
+        modifier = Modifier
+            .fillMaxSize()
+            .padding(16.dp),
+        verticalArrangement = Arrangement.spacedBy(16.dp)
+    ) {
+        ScrollableTabRow(selectedTabIndex = state.selectedDateIndex) {
+            state.dates.forEachIndexed { index, date ->
+                Tab(
+                    selected = state.selectedDateIndex == index,
+                    onClick = { onSelectDate(index) }
+                ) {
+                    Column(
+                        modifier = Modifier
+                            .padding(horizontal = 12.dp, vertical = 8.dp)
+                            .testTag(TestIds.Book.getIdDateItemByPosition(index)),
+                        horizontalAlignment = Alignment.CenterHorizontally
+                    ) {
+                        Text(
+                            modifier = Modifier.testTag(TestIds.Book.ITEM_DATE),
+                            text = date.displayDate,
+                            style = MaterialTheme.typography.bodyMedium
+                        )
+                    }
+                }
+            }
+        }
+
+        val places = state.dates.getOrNull(state.selectedDateIndex)?.places.orEmpty()
+        LazyColumn(
+            modifier = Modifier
+                .weight(1f)
+                .fillMaxWidth(),
+            verticalArrangement = Arrangement.spacedBy(8.dp)
+        ) {
+            itemsIndexed(places) { index, place ->
+                PlaceItem(
+                    index = index,
+                    title = place.title,
+                    selected = index == state.selectedPlaceIndex,
+                    onClick = { onSelectPlace(index) }
+                )
+            }
+        }
+
+        Row(
+            modifier = Modifier.fillMaxWidth(),
+            horizontalArrangement = Arrangement.spacedBy(8.dp)
+        ) {
+            TextButton(
+                modifier = Modifier
+                    .weight(1f)
+                    .testTag(TestIds.Book.BACK_BUTTON),
+                onClick = onBack
+            ) {
+                Text(text = stringResource(R.string.book_back))
+            }
+            Button(
+                modifier = Modifier
+                    .weight(1f)
+                    .testTag(TestIds.Book.BOOK_BUTTON),
+                enabled = state.canBook,
+                onClick = onBook
+            ) {
+                if (state.isBooking) {
+                    CircularProgressIndicator(modifier = Modifier.height(16.dp))
+                } else {
+                    Text(text = stringResource(R.string.book_book))
+                }
+            }
+        }
+    }
+}
+
+@Composable
+private fun PlaceItem(
+    index: Int,
+    title: String,
+    selected: Boolean,
+    onClick: () -> Unit
+) {
+    Surface(
+        tonalElevation = if (selected) 4.dp else 0.dp
+    ) {
+        Row(
+            modifier = Modifier
+                .fillMaxWidth()
+                .testTag(TestIds.Book.getIdPlaceItemByPosition(index))
+                .selectable(
+                    selected = selected,
+                    role = Role.RadioButton,
+                    onClick = onClick
+                )
+                .padding(16.dp),
+            verticalAlignment = Alignment.CenterVertically
+        ) {
+            RadioButton(
+                modifier = Modifier.testTag(TestIds.Book.ITEM_PLACE_SELECTOR),
+                selected = selected,
+                onClick = null
+            )
+            Spacer(modifier = Modifier.width(12.dp))
+            Text(
+                modifier = Modifier.testTag(TestIds.Book.ITEM_PLACE_TEXT),
+                text = title,
+                style = MaterialTheme.typography.bodyLarge
+            )
+        }
+    }
+}

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

@@ -0,0 +1,6 @@
+package ru.myitschool.work.ui.screen.book
+
+sealed interface BookingAction {
+    data object CloseWithSuccess : BookingAction
+    data object NavigateToAuth : BookingAction
+}

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

@@ -0,0 +1,9 @@
+package ru.myitschool.work.ui.screen.book
+
+sealed interface BookingIntent {
+    data object Refresh : BookingIntent
+    data class SelectDate(val index: Int) : BookingIntent
+    data class SelectPlace(val index: Int) : BookingIntent
+    data object Book : BookingIntent
+    data object Back : BookingIntent
+}

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

@@ -0,0 +1,31 @@
+package ru.myitschool.work.ui.screen.book
+
+import kotlinx.collections.immutable.ImmutableList
+import kotlinx.collections.immutable.persistentListOf
+
+data class BookingUiState(
+    val isLoading: Boolean = true,
+    val showError: Boolean = false,
+    val showEmpty: Boolean = false,
+    val dates: ImmutableList<BookingDateUi> = persistentListOf(),
+    val selectedDateIndex: Int = 0,
+    val selectedPlaceIndex: Int = -1,
+    val isBooking: Boolean = false
+) {
+    val canBook: Boolean
+        get() = dates.isNotEmpty() &&
+            selectedDateIndex in dates.indices &&
+            selectedPlaceIndex in dates[selectedDateIndex].places.indices &&
+            !isBooking
+}
+
+data class BookingDateUi(
+    val isoDate: String,
+    val displayDate: String,
+    val places: ImmutableList<BookingPlaceUi>
+)
+
+data class BookingPlaceUi(
+    val id: Int,
+    val title: String
+)

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

@@ -0,0 +1,141 @@
+package ru.myitschool.work.ui.screen.book
+
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.viewModelScope
+import kotlinx.collections.immutable.toImmutableList
+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.BookingRepository
+import java.time.LocalDate
+import java.time.format.DateTimeFormatter
+
+class BookingViewModel : ViewModel() {
+    private val _uiState = MutableStateFlow(BookingUiState())
+    val uiState: StateFlow<BookingUiState> = _uiState.asStateFlow()
+
+    private val _actionFlow: MutableSharedFlow<BookingAction> = MutableSharedFlow()
+    val actionFlow: SharedFlow<BookingAction> = _actionFlow
+
+    private val isoFormatter = DateTimeFormatter.ofPattern("yyyy-MM-dd")
+    private val displayFormatter = DateTimeFormatter.ofPattern("dd.MM")
+
+    init {
+        refresh()
+    }
+
+    fun onIntent(intent: BookingIntent) {
+        when (intent) {
+            BookingIntent.Refresh -> refresh()
+            is BookingIntent.SelectDate -> selectDate(intent.index)
+            is BookingIntent.SelectPlace -> selectPlace(intent.index)
+            BookingIntent.Book -> book()
+            BookingIntent.Back -> Unit
+        }
+    }
+
+    private fun refresh() {
+        viewModelScope.launch(Dispatchers.IO) {
+            _uiState.update {
+                it.copy(
+                    isLoading = true,
+                    showError = false,
+                    showEmpty = false,
+                    isBooking = false
+                )
+            }
+            val code = AuthRepository.getCurrentCode()
+            if (code == null) {
+                _actionFlow.emit(BookingAction.NavigateToAuth)
+                return@launch
+            }
+            BookingRepository.fetchAvailability(code).fold(
+                onSuccess = { map ->
+                    val dates = map.entries
+                        .filter { it.value.isNotEmpty() }
+                        .sortedBy { LocalDate.parse(it.key, isoFormatter) }
+                        .map { entry ->
+                            BookingDateUi(
+                                isoDate = entry.key,
+                                displayDate = LocalDate.parse(entry.key, isoFormatter).format(displayFormatter),
+                                places = entry.value.map { option ->
+                                    BookingPlaceUi(
+                                        id = option.id,
+                                        title = option.place
+                                    )
+                                }.toImmutableList()
+                            )
+                        }
+                        .toImmutableList()
+
+                    val showEmpty = dates.isEmpty()
+                    _uiState.update {
+                        it.copy(
+                            isLoading = false,
+                            showError = false,
+                            showEmpty = showEmpty,
+                            dates = dates,
+                            selectedDateIndex = 0,
+                            selectedPlaceIndex = if (!showEmpty && dates[0].places.isNotEmpty()) 0 else -1
+                        )
+                    }
+                },
+                onFailure = {
+                    _uiState.update { state ->
+                        state.copy(isLoading = false, showError = true)
+                    }
+                }
+            )
+        }
+    }
+
+    private fun selectDate(index: Int) {
+        _uiState.update { state ->
+            if (index !in state.dates.indices) state
+            else state.copy(
+                selectedDateIndex = index,
+                selectedPlaceIndex = if (state.dates[index].places.isNotEmpty()) 0 else -1
+            )
+        }
+    }
+
+    private fun selectPlace(index: Int) {
+        _uiState.update { state ->
+            val currentPlaces = state.dates.getOrNull(state.selectedDateIndex)?.places
+                ?: return@update state
+            if (index !in currentPlaces.indices) return@update state
+            state.copy(selectedPlaceIndex = index)
+        }
+    }
+
+    private fun book() {
+        val currentState = _uiState.value
+        if (!currentState.canBook) return
+
+        viewModelScope.launch(Dispatchers.IO) {
+            val code = AuthRepository.getCurrentCode()
+            if (code == null) {
+                _actionFlow.emit(BookingAction.NavigateToAuth)
+                return@launch
+            }
+            val date = currentState.dates[currentState.selectedDateIndex]
+            val place = date.places[currentState.selectedPlaceIndex]
+            _uiState.update { it.copy(isBooking = true) }
+            BookingRepository.createBooking(code, date.isoDate, place.id).fold(
+                onSuccess = {
+                    _uiState.update { it.copy(isBooking = false) }
+                    _actionFlow.emit(BookingAction.CloseWithSuccess)
+                },
+                onFailure = {
+                    _uiState.update { it.copy(isBooking = false, showError = true) }
+                }
+            )
+        }
+    }
+}

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

@@ -0,0 +1,6 @@
+package ru.myitschool.work.ui.screen.main
+
+sealed interface MainAction {
+    data object NavigateToAuth : MainAction
+    data object NavigateToBooking : MainAction
+}

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

@@ -0,0 +1,7 @@
+package ru.myitschool.work.ui.screen.main
+
+sealed interface MainIntent {
+    data object Refresh : MainIntent
+    data object Logout : MainIntent
+    data object AddBooking : MainIntent
+}

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

@@ -0,0 +1,264 @@
+package ru.myitschool.work.ui.screen.main
+
+import androidx.compose.foundation.background
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.layout.width
+import androidx.compose.foundation.lazy.LazyColumn
+import androidx.compose.foundation.lazy.itemsIndexed
+import androidx.compose.foundation.shape.CircleShape
+import androidx.compose.material3.Button
+import androidx.compose.material3.Card
+import androidx.compose.material3.CardDefaults
+import androidx.compose.material3.CircularProgressIndicator
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.collectAsState
+import androidx.compose.runtime.getValue
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.clip
+import androidx.compose.ui.layout.ContentScale
+import androidx.compose.ui.platform.testTag
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.text.style.TextAlign
+import androidx.compose.ui.unit.dp
+import androidx.lifecycle.viewmodel.compose.viewModel
+import androidx.navigation.NavController
+import coil3.compose.AsyncImage
+import kotlinx.coroutines.flow.collectLatest
+import ru.myitschool.work.R
+import ru.myitschool.work.core.TestIds
+import ru.myitschool.work.ui.nav.AuthScreenDestination
+import ru.myitschool.work.ui.nav.BOOKING_RESULT_KEY
+import ru.myitschool.work.ui.nav.BookScreenDestination
+import ru.myitschool.work.ui.screen.main.MainAction.NavigateToAuth
+import ru.myitschool.work.ui.screen.main.MainAction.NavigateToBooking
+
+@Composable
+private fun ProfileAvatar(
+    name: String,
+    photoUrl: String?
+) {
+    val modifier = Modifier
+        .size(72.dp)
+        .clip(CircleShape)
+        .testTag(TestIds.Main.PROFILE_IMAGE)
+    if (photoUrl.isNullOrBlank()) {
+        Box(
+            modifier = modifier.background(MaterialTheme.colorScheme.primary.copy(alpha = 0.1f)),
+            contentAlignment = Alignment.Center
+        ) {
+            val placeholder = name.firstOrNull()?.uppercaseChar()?.toString() ?: "?"
+            Text(
+                text = placeholder,
+                style = MaterialTheme.typography.headlineMedium,
+                color = MaterialTheme.colorScheme.primary
+            )
+        }
+    } else {
+        AsyncImage(
+            modifier = modifier,
+            model = photoUrl,
+            contentDescription = null,
+            contentScale = ContentScale.Crop
+        )
+    }
+}
+
+@Composable
+fun MainScreen(
+    navController: NavController,
+    viewModel: MainViewModel = viewModel()
+) {
+    val state by viewModel.uiState.collectAsState()
+
+    LaunchedEffect(Unit) {
+        viewModel.actionFlow.collectLatest { action ->
+            when (action) {
+                NavigateToAuth -> {
+                    navController.navigate(AuthScreenDestination) {
+                        popUpTo(AuthScreenDestination) { inclusive = true }
+                    }
+                }
+
+                NavigateToBooking -> {
+                    navController.navigate(BookScreenDestination)
+                }
+            }
+        }
+    }
+
+    val refreshFlow = navController.currentBackStackEntry
+        ?.savedStateHandle
+        ?.getStateFlow(BOOKING_RESULT_KEY, false)
+
+    LaunchedEffect(refreshFlow) {
+        refreshFlow?.collectLatest { shouldRefresh ->
+            if (shouldRefresh) {
+                viewModel.onIntent(MainIntent.Refresh)
+                navController.currentBackStackEntry?.savedStateHandle?.set(BOOKING_RESULT_KEY, false)
+            }
+        }
+    }
+
+    when {
+        state.isLoading -> MainLoading()
+        state.showError -> MainError(onRetry = { viewModel.onIntent(MainIntent.Refresh) })
+        else -> MainContent(
+            state = state,
+            onRefresh = { viewModel.onIntent(MainIntent.Refresh) },
+            onAddBooking = { viewModel.onIntent(MainIntent.AddBooking) },
+            onLogout = { viewModel.onIntent(MainIntent.Logout) }
+        )
+    }
+}
+
+@Composable
+private fun MainLoading() {
+    Box(
+        modifier = Modifier.fillMaxSize(),
+        contentAlignment = Alignment.Center
+    ) {
+        CircularProgressIndicator()
+    }
+}
+
+@Composable
+private fun MainError(onRetry: () -> Unit) {
+    Column(
+        modifier = Modifier
+            .fillMaxSize()
+            .padding(24.dp),
+        verticalArrangement = Arrangement.Center,
+        horizontalAlignment = Alignment.CenterHorizontally
+    ) {
+        Text(
+            modifier = Modifier.testTag(TestIds.Main.ERROR),
+            text = stringResource(R.string.main_error_text),
+            style = MaterialTheme.typography.bodyLarge,
+            textAlign = TextAlign.Center
+        )
+        Spacer(modifier = Modifier.height(16.dp))
+        Button(
+            modifier = Modifier
+                .fillMaxWidth()
+                .testTag(TestIds.Main.REFRESH_BUTTON),
+            onClick = onRetry
+        ) {
+            Text(text = stringResource(R.string.main_refresh))
+        }
+    }
+}
+
+@Composable
+private fun MainContent(
+    state: MainUiState,
+    onRefresh: () -> Unit,
+    onAddBooking: () -> Unit,
+    onLogout: () -> Unit
+) {
+    Column(
+        modifier = Modifier
+            .fillMaxSize()
+            .padding(16.dp),
+        verticalArrangement = Arrangement.spacedBy(16.dp)
+    ) {
+        Row(verticalAlignment = Alignment.CenterVertically) {
+            ProfileAvatar(
+                name = state.name,
+                photoUrl = state.photoUrl
+            )
+            Spacer(modifier = Modifier.width(16.dp))
+            Text(
+                modifier = Modifier.testTag(TestIds.Main.PROFILE_NAME),
+                text = state.name,
+                style = MaterialTheme.typography.headlineSmall
+            )
+        }
+
+        Row(
+            modifier = Modifier.fillMaxWidth(),
+            horizontalArrangement = Arrangement.spacedBy(8.dp)
+        ) {
+            Button(
+                modifier = Modifier
+                    .weight(1f)
+                    .testTag(TestIds.Main.ADD_BUTTON),
+                onClick = onAddBooking
+            ) {
+                Text(text = stringResource(R.string.main_add))
+            }
+            Button(
+                modifier = Modifier
+                    .weight(1f)
+                    .testTag(TestIds.Main.REFRESH_BUTTON),
+                onClick = onRefresh
+            ) {
+                Text(text = stringResource(R.string.main_refresh))
+            }
+            Button(
+                modifier = Modifier
+                    .weight(1f)
+                    .testTag(TestIds.Main.LOGOUT_BUTTON),
+                onClick = onLogout
+            ) {
+                Text(text = stringResource(R.string.main_logout))
+            }
+        }
+
+        Text(
+            text = stringResource(R.string.main_bookings_title),
+            style = MaterialTheme.typography.titleMedium
+        )
+
+        if (state.bookings.isEmpty()) {
+            Text(
+                text = stringResource(R.string.main_empty_list),
+                style = MaterialTheme.typography.bodyMedium
+            )
+        } else {
+            LazyColumn(
+                modifier = Modifier.fillMaxWidth(),
+                verticalArrangement = Arrangement.spacedBy(8.dp)
+            ) {
+                itemsIndexed(state.bookings) { index, booking ->
+                    Card(
+                        modifier = Modifier
+                            .fillMaxWidth()
+                            .testTag(TestIds.Main.getIdItemByPosition(index)),
+                        colors = CardDefaults.cardColors(
+                            containerColor = MaterialTheme.colorScheme.surfaceVariant
+                        )
+                    ) {
+                        Column(
+                            modifier = Modifier.padding(16.dp),
+                            verticalArrangement = Arrangement.spacedBy(8.dp)
+                        ) {
+                            Text(
+                                modifier = Modifier.testTag(TestIds.Main.ITEM_DATE),
+                                text = booking.dateDisplay,
+                                style = MaterialTheme.typography.titleMedium
+                            )
+                            Text(
+                                modifier = Modifier.testTag(TestIds.Main.ITEM_PLACE),
+                                text = booking.place,
+                                style = MaterialTheme.typography.bodyLarge
+                            )
+                        }
+                    }
+                }
+            }
+        }
+    }
+}

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

@@ -0,0 +1,21 @@
+package ru.myitschool.work.ui.screen.main
+
+import kotlinx.collections.immutable.ImmutableList
+import kotlinx.collections.immutable.persistentListOf
+
+data class MainUiState(
+    val isLoading: Boolean = true,
+    val showError: Boolean = false,
+    val name: String = "",
+    val photoUrl: String? = null,
+    val bookings: ImmutableList<MainBookingUi> = persistentListOf()
+) {
+    val hasContent: Boolean get() = !isLoading && !showError
+}
+
+data class MainBookingUi(
+    val id: Int,
+    val dateIso: String,
+    val dateDisplay: String,
+    val place: String
+)

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

@@ -0,0 +1,102 @@
+package ru.myitschool.work.ui.screen.main
+
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.viewModelScope
+import kotlinx.collections.immutable.toImmutableList
+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.core.Constants
+import ru.myitschool.work.data.repo.AuthRepository
+import ru.myitschool.work.data.repo.UserRepository
+import ru.myitschool.work.ui.screen.main.MainAction.NavigateToAuth
+import ru.myitschool.work.ui.screen.main.MainAction.NavigateToBooking
+import java.time.LocalDate
+import java.time.format.DateTimeFormatter
+
+class MainViewModel : ViewModel() {
+    private val _uiState = MutableStateFlow(MainUiState())
+    val uiState: StateFlow<MainUiState> = _uiState.asStateFlow()
+
+    private val _actionFlow: MutableSharedFlow<MainAction> = MutableSharedFlow()
+    val actionFlow: SharedFlow<MainAction> = _actionFlow
+
+    private val dateFormatterServer = DateTimeFormatter.ofPattern("yyyy-MM-dd")
+    private val dateFormatterDisplay = DateTimeFormatter.ofPattern("dd.MM.yyyy")
+
+    init {
+        refresh()
+    }
+
+    fun onIntent(intent: MainIntent) {
+        when (intent) {
+            MainIntent.Refresh -> refresh()
+            MainIntent.Logout -> logout()
+            MainIntent.AddBooking -> openBooking()
+        }
+    }
+
+    private fun refresh() {
+        viewModelScope.launch(Dispatchers.IO) {
+            _uiState.update { it.copy(isLoading = true, showError = false) }
+            val code = AuthRepository.getCurrentCode()
+            if (code == null) {
+                _actionFlow.emit(NavigateToAuth)
+                return@launch
+            }
+            UserRepository.fetchUserInfo(code).fold(
+                onSuccess = { info ->
+                    val bookings = info.booking.entries
+                        .sortedBy { LocalDate.parse(it.key, dateFormatterServer) }
+                        .mapIndexed { index, entry ->
+                            val date = LocalDate.parse(entry.key, dateFormatterServer)
+                            MainBookingUi(
+                                id = index,
+                                dateIso = entry.key,
+                                dateDisplay = date.format(dateFormatterDisplay),
+                                place = entry.value.place
+                            )
+                        }
+                        .toImmutableList()
+                    val resolvedPhoto = info.photoUrl.let { url ->
+                        if (url.isBlank()) null
+                        else if (url.startsWith("http")) url
+                        else "${Constants.HOST}$url"
+                    }
+                    _uiState.update {
+                        it.copy(
+                            isLoading = false,
+                            showError = false,
+                            name = info.name,
+                            photoUrl = resolvedPhoto,
+                            bookings = bookings
+                        )
+                    }
+                },
+                onFailure = {
+                    _uiState.update { state ->
+                        state.copy(isLoading = false, showError = true)
+                    }
+                }
+            )
+        }
+    }
+
+    private fun openBooking() {
+        viewModelScope.launch {
+            _actionFlow.emit(NavigateToBooking)
+        }
+    }
+
+    private fun logout() {
+        viewModelScope.launch(Dispatchers.IO) {
+            AuthRepository.clear()
+            _actionFlow.emit(NavigateToAuth)
+        }
+    }
+}

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

@@ -4,4 +4,19 @@
     <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="auth_error_text">Неверный код или произошла ошибка. Попробуйте снова.</string>
+    <string name="main_logout">Выйти</string>
+    <string name="main_refresh">Обновить</string>
+    <string name="main_add">Забронировать</string>
+    <string name="main_error_text">Не удалось загрузить данные. Попробуйте обновить.</string>
+    <string name="main_bookings_title">Ваши бронирования</string>
+    <string name="main_empty_list">Нет активных бронирований</string>
+    <string name="book_title">Бронирование</string>
+    <string name="book_book">Забронировать</string>
+    <string name="book_back">Назад</string>
+    <string name="book_error_text">Не удалось получить данные. Повторите попытку.</string>
+    <string name="book_refresh">Обновить</string>
+    <string name="book_select_date">Выберите дату</string>
+    <string name="book_select_place">Выберите место</string>
+    <string name="book_empty">Всё забронировано</string>
 </resources>