Homework 14

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

@@ -7,6 +7,11 @@ import android.view.ViewGroup
 import androidx.core.view.isVisible
 import androidx.fragment.app.Fragment
 import androidx.fragment.app.viewModels
+import androidx.lifecycle.Lifecycle
+import androidx.lifecycle.lifecycleScope
+import androidx.lifecycle.repeatOnLifecycle
+import kotlinx.coroutines.flow.collect
+import kotlinx.coroutines.launch
 import ru.otus.coroutineshomework.databinding.ContentBinding
 import ru.otus.coroutineshomework.databinding.FragmentLoginBinding
 import ru.otus.coroutineshomework.databinding.LoadingBinding
@@ -43,12 +48,16 @@ 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()
+        viewLifecycleOwner.lifecycleScope.launch {
+            viewLifecycleOwner.repeatOnLifecycle(Lifecycle.State.STARTED) {
+                loginViewModel.state.collect {
+                    when (it) {
+                        is LoginViewState.Login -> showLogin(it)
+                        LoginViewState.LoggingIn -> showLoggingIn()
+                        is LoginViewState.Content -> showContent(it)
+                        LoginViewState.LoggingOut -> showLoggingOut()
+                    }
+                }
             }
         }
     }

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

@@ -3,25 +3,63 @@ 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.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
+    private val loginApi = LoginApi()
 
     /**
      * Login to the network
      * @param name user name
      * @param password user password
      */
     fun login(name: String, password: String) {
-        // TODO: Implement login
+        viewModelScope.launch {
+            loginFlow(Credentials(name, password)).collect {
+                _state.value = it
+            }
+        }
+    }
+
+    private fun loginFlow(creds: Credentials): Flow<LoginViewState> = flow {
+        emit(LoginViewState.LoggingIn)
+        try {
+            val user = withContext(Dispatchers.IO) {
+                return@withContext loginApi.login(creds)
+            }
+            emit(LoginViewState.Content(user))
+        } catch (e: Exception) {
+            emit(LoginViewState.Login(e))
+        }
     }
 
     /**
      * Logout from the network
      */
     fun logout() {
-        // TODO: Implement logout
+        _state.value = LoginViewState.LoggingOut
+
+        viewModelScope.launch {
+            try {
+                withContext(Dispatchers.IO) {
+                    return@withContext loginApi.logout()
+                }
+                _state.value = LoginViewState.Login()
+            } catch (e: Exception) {
+                _state.value = LoginViewState.Login(e)
+            }
+        }
+
     }
 }

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

@@ -4,8 +4,11 @@ import android.util.Log
 import androidx.lifecycle.LiveData
 import androidx.lifecycle.MutableLiveData
 import androidx.lifecycle.ViewModel
+import androidx.lifecycle.viewModelScope
 import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.async
 import kotlinx.coroutines.isActive
+import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
 import kotlin.random.Random
 
@@ -18,7 +21,22 @@ class NetworkViewModel : ViewModel() {
     val result: LiveData<Long?> = _result
 
     fun startTest(numberOfThreads: Int) {
-        // TODO: Implement the logic
+        _running.value = true
+
+        viewModelScope.launch {
+            val results = mutableListOf<Result<Long>>()
+            withContext(Dispatchers.IO) {
+                repeat(numberOfThreads) {
+                    val result = async { emulateBlockingNetworkRequest() }
+                    results.add(result.await())
+                }
+            }
+
+            val successResults = results.mapNotNull { it.getOrNull() }
+
+            _result.value = successResults.average().toLong()
+            _running.value = false
+        }
     }
 
     private companion object {

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

@@ -5,10 +5,13 @@ import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
 import androidx.fragment.app.Fragment
+import androidx.lifecycle.Lifecycle
 import androidx.lifecycle.lifecycleScope
+import androidx.lifecycle.repeatOnLifecycle
 import kotlinx.coroutines.Job
 import kotlinx.coroutines.delay
-import kotlinx.coroutines.isActive
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.collect
 import kotlinx.coroutines.launch
 import ru.otus.coroutineshomework.databinding.FragmentTimerBinding
 import java.util.Locale
@@ -25,6 +28,11 @@ class TimerFragment : Fragment() {
         binding.time.text = newValue.toDisplayString()
     }
 
+    private var timeFlow = MutableStateFlow(Duration.ZERO)
+    private var timerJob: Job? = null
+
+    private var timeDelay = 10.milliseconds
+
     private var started by Delegates.observable(false) { _, _, newValue ->
         setButtonsState(newValue)
         if (newValue) {
@@ -53,12 +61,19 @@ 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()
+            viewLifecycleOwner.lifecycleScope.launch {
+                viewLifecycleOwner.repeatOnLifecycle(Lifecycle.State.STARTED) {
+                     timeFlow.collect {
+                        time.text = it.toDisplayString()
+                    }
+                }
+            }
+            time.text = this@TimerFragment.timeFlow.value.toDisplayString()
             btnStart.setOnClickListener {
                 started = true
             }
@@ -70,21 +85,28 @@ 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 fun startTimer() {
-        // TODO: Start timer
+        timerJob = lifecycleScope.launch {
+            while (started) {
+                delay(timeDelay)
+                timeFlow.emit(timeFlow.value + timeDelay )
+            }
+        }
     }
 
     private fun stopTimer() {
-        // TODO: Stop timer
+        timerJob?.cancel()
+        timerJob = null
     }
 
     override fun onDestroyView() {
         super.onDestroyView()
         _binding = null
+        stopTimer()
     }
 
     companion object {

app/src/main/res/values-night/themes.xml

@@ -1,6 +1,6 @@
 <resources xmlns:tools="http://schemas.android.com/tools">
     <!-- Base application theme. -->
-    <style name="Theme.CoroutinesHomework" parent="Theme.MaterialComponents.DayNight.DarkActionBar">
+    <style name="Theme.CoroutinesHomework" parent="Theme.Material3.DayNight">
         <!-- Primary brand color. -->
         <item name="colorPrimary">@color/purple_200</item>
         <item name="colorPrimaryVariant">@color/purple_700</item>