Сделал ДЗ № 15

app/src/main/kotlin/ru/otus/coroutineshomework/ui/login/LoginFragment.kt

@@ -7,6 +7,8 @@ import android.view.ViewGroup
 import androidx.core.view.isVisible
 import androidx.fragment.app.Fragment
 import androidx.fragment.app.viewModels
+import androidx.lifecycle.lifecycleScope
+import kotlinx.coroutines.launch
 import ru.otus.coroutineshomework.databinding.ContentBinding
 import ru.otus.coroutineshomework.databinding.FragmentLoginBinding
 import ru.otus.coroutineshomework.databinding.LoadingBinding
@@ -43,12 +45,14 @@ class LoginFragment : Fragment() {
         setupLogin()
         setupContent()
 
-        loginViewModel.state.observe(viewLifecycleOwner) {
-            when(it) {
-                is LoginViewState.Login -> showLogin(it)
-                LoginViewState.LoggingIn -> showLoggingIn()
-                is LoginViewState.Content -> showContent(it)
-                LoginViewState.LoggingOut -> showLoggingOut()
+        lifecycleScope.launch {
+            loginViewModel.state.collect { state ->
+                when (state) {
+                    is LoginViewState.Login -> showLogin(state)
+                    LoginViewState.LoggingIn -> showLoggingIn()
+                    is LoginViewState.Content -> showContent(state)
+                    LoginViewState.LoggingOut -> showLoggingOut()
+                }
             }
         }
     }

app/src/main/kotlin/ru/otus/coroutineshomework/ui/login/LoginViewModel.kt

@@ -1,27 +1,53 @@
 package ru.otus.coroutineshomework.ui.login
 
-import androidx.lifecycle.LiveData
-import androidx.lifecycle.MutableLiveData
 import androidx.lifecycle.ViewModel
+import androidx.lifecycle.viewModelScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.asStateFlow
+import kotlinx.coroutines.flow.flow
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.withContext
+import ru.otus.coroutineshomework.ui.login.data.Credentials
 
 class LoginViewModel : ViewModel() {
 
-    private val _state = MutableLiveData<LoginViewState>(LoginViewState.Login())
-    val state: LiveData<LoginViewState> = _state
+    private val _state = MutableStateFlow<LoginViewState>(LoginViewState.Login())
+    val state: StateFlow<LoginViewState> = _state.asStateFlow()
+
+    private fun loginFlow(credentials: Credentials): Flow<LoginViewState> =
+        flow {
+            val result = withContext(Dispatchers.IO) {
+                runCatching { LoginApi().login(credentials) }
+            }
+            result.onSuccess { emit(LoginViewState.Content(it)) }
+            result.onFailure { emit(LoginViewState.Login(it as Exception)) }
+        }
 
     /**
      * Login to the network
      * @param name user name
      * @param password user password
      */
     fun login(name: String, password: String) {
-        // TODO: Implement login
+        _state.value = LoginViewState.LoggingIn
+        viewModelScope.launch {
+            loginFlow(Credentials(name, password)).collect {
+                _state.value = it
+            }
+        }
     }
 
     /**
      * Logout from the network
      */
     fun logout() {
-        // TODO: Implement logout
+        _state.value = LoginViewState.LoggingOut
+        viewModelScope.launch(Dispatchers.IO) {
+            LoginApi().logout()
+        }
+        _state.value = LoginViewState.Login()
     }
 }

app/src/main/kotlin/ru/otus/coroutineshomework/ui/network/NetworkViewModel.kt

@@ -4,8 +4,13 @@ import android.util.Log
 import androidx.lifecycle.LiveData
 import androidx.lifecycle.MutableLiveData
 import androidx.lifecycle.ViewModel
+import androidx.lifecycle.viewModelScope
+import kotlinx.coroutines.Deferred
 import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.async
+import kotlinx.coroutines.awaitAll
 import kotlinx.coroutines.isActive
+import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
 import kotlin.random.Random
 
@@ -18,7 +23,23 @@ class NetworkViewModel : ViewModel() {
     val result: LiveData<Long?> = _result
 
     fun startTest(numberOfThreads: Int) {
-        // TODO: Implement the logic
+        _running.value = true
+        _result.value = null
+
+        val deferredResults = mutableListOf<Deferred<Result<Long>>>()
+
+        viewModelScope.launch {
+            repeat(numberOfThreads) {
+                deferredResults.add(async(Dispatchers.IO) { emulateBlockingNetworkRequest() })
+            }
+            val results = deferredResults.awaitAll()
+
+            val successCount = results.count { it.isSuccess }
+
+            _running.value = false
+            _result.value = if (successCount == 0) null else
+                results.filter { res -> res.isSuccess }.sumOf { it.getOrNull() ?: 0 } / successCount
+        }
     }
 
     private companion object {

app/src/main/kotlin/ru/otus/coroutineshomework/ui/timer/TimerFragment.kt

@@ -6,24 +6,27 @@ import android.view.View
 import android.view.ViewGroup
 import androidx.fragment.app.Fragment
 import androidx.lifecycle.lifecycleScope
-import kotlinx.coroutines.Job
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.delay
-import kotlinx.coroutines.isActive
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.flow
 import kotlinx.coroutines.launch
 import ru.otus.coroutineshomework.databinding.FragmentTimerBinding
+import java.time.Instant
 import java.util.Locale
 import kotlin.properties.Delegates
 import kotlin.time.Duration
 import kotlin.time.Duration.Companion.milliseconds
+import kotlin.time.DurationUnit
+import kotlin.time.toDuration
 
 class TimerFragment : Fragment() {
 
     private var _binding: FragmentTimerBinding? = null
     private val binding get() = _binding!!
 
-    private var time: Duration by Delegates.observable(Duration.ZERO) { _, _, newValue ->
-        binding.time.text = newValue.toDisplayString()
-    }
+    private val timeFlow = MutableStateFlow(Duration.ZERO)
 
     private var started by Delegates.observable(false) { _, _, newValue ->
         setButtonsState(newValue)
@@ -53,12 +56,17 @@ class TimerFragment : Fragment() {
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         super.onViewCreated(view, savedInstanceState)
         savedInstanceState?.let {
-            time = it.getLong(TIME).milliseconds
+            timeFlow.value = it.getLong(TIME).milliseconds
             started = it.getBoolean(STARTED)
         }
         setButtonsState(started)
         with(binding) {
-            time.text = this@TimerFragment.time.toDisplayString()
+            lifecycleScope.launch {
+                timeFlow.collect {
+                    time.text = this@TimerFragment.timeFlow.value.toDisplayString()
+                }
+            }
+
             btnStart.setOnClickListener {
                 started = true
             }
@@ -70,16 +78,35 @@ class TimerFragment : Fragment() {
 
     override fun onSaveInstanceState(outState: Bundle) {
         super.onSaveInstanceState(outState)
-        outState.putLong(TIME, time.inWholeMilliseconds)
+        outState.putLong(TIME, timeFlow.value.inWholeMilliseconds)
         outState.putBoolean(STARTED, started)
     }
 
+    private lateinit var timerStartedAt: Instant
+
+    private fun getTimeDuration(): Duration {
+        return (Instant.now().toEpochMilli() - timerStartedAt.toEpochMilli()).toDuration(
+            DurationUnit.MILLISECONDS
+        )
+    }
+
+    private fun doTimerLoops() =
+        flow {
+            while (started) {
+                emit(getTimeDuration())
+                delay(16) // 1/60 Hz
+            }
+        }
+
     private fun startTimer() {
-        // TODO: Start timer
+        CoroutineScope(Dispatchers.Main).launch {
+            doTimerLoops().collect { duration -> timeFlow.value = duration }
+        }
+        timerStartedAt = Instant.now()
     }
 
     private fun stopTimer() {
-        // TODO: Stop timer
+        timeFlow.value = getTimeDuration()
     }
 
     override fun onDestroyView() {
@@ -96,7 +123,7 @@ class TimerFragment : Fragment() {
             "%02d:%02d.%03d",
             this.inWholeMinutes.toInt(),
             this.inWholeSeconds.toInt(),
-            this.inWholeMilliseconds.toInt()
+            this.inWholeMilliseconds.toInt().mod(1000)
         )
     }
 }