Clear updates feed from options menu

app/src/main/java/org/koitharu/kotatsu/tracker/ui/FeedFragment.kt

@@ -2,6 +2,7 @@ package org.koitharu.kotatsu.tracker.ui
 
 import android.os.Bundle
 import android.view.*
+import androidx.appcompat.app.AlertDialog
 import androidx.core.graphics.Insets
 import androidx.core.view.updatePadding
 import com.google.android.material.snackbar.Snackbar
@@ -55,6 +56,9 @@ class FeedFragment : BaseFragment<FragmentFeedBinding>(), PaginationScrollListen
 
 		viewModel.content.observe(viewLifecycleOwner, this::onListChanged)
 		viewModel.onError.observe(viewLifecycleOwner, this::onError)
+		viewModel.onFeedCleared.observe(viewLifecycleOwner) {
+			onFeedCleared()
+		}
 		TrackWorker.getProgressLiveData(view.context.applicationContext)
 			.observe(viewLifecycleOwner, this::onUpdateProgressChanged)
 	}
@@ -64,17 +68,29 @@ class FeedFragment : BaseFragment<FragmentFeedBinding>(), PaginationScrollListen
 		inflater.inflate(R.menu.opt_feed, menu)
 	}
 
-	override fun onOptionsItemSelected(item: MenuItem) = when (item.itemId) {
-		R.id.action_update -> {
-			TrackWorker.startNow(requireContext())
-			Snackbar.make(
-				binding.recyclerView,
-				R.string.feed_will_update_soon,
-				Snackbar.LENGTH_SHORT
-			).show()
-			true
+	override fun onOptionsItemSelected(item: MenuItem): Boolean {
+		return when (item.itemId) {
+			R.id.action_update -> {
+				TrackWorker.startNow(requireContext())
+				Snackbar.make(
+					binding.recyclerView,
+					R.string.feed_will_update_soon,
+					Snackbar.LENGTH_SHORT
+				).show()
+				true
+			}
+			R.id.action_clear_feed -> {
+				AlertDialog.Builder(context ?: return false)
+					.setTitle(R.string.clear_updates_feed)
+					.setMessage(R.string.text_clear_updates_feed_prompt)
+					.setNegativeButton(android.R.string.cancel, null)
+					.setPositiveButton(R.string.clear) { _, _ ->
+						viewModel.clearFeed()
+					}.show()
+				true
+			}
+			else -> super.onOptionsItemSelected(item)
 		}
-		else -> super.onOptionsItemSelected(item)
 	}
 
 	override fun onDestroyView() {
@@ -95,6 +111,14 @@ class FeedFragment : BaseFragment<FragmentFeedBinding>(), PaginationScrollListen
 		feedAdapter?.items = list
 	}
 
+	private fun onFeedCleared() {
+		Snackbar.make(
+			binding.recyclerView,
+			R.string.updates_feed_cleared,
+			Snackbar.LENGTH_LONG
+		).show()
+	}
+
 	private fun onError(e: Throwable) {
 		Snackbar.make(
 			binding.recyclerView,

app/src/main/java/org/koitharu/kotatsu/tracker/ui/FeedViewModel.kt

@@ -5,6 +5,7 @@ import androidx.lifecycle.MutableLiveData
 import androidx.lifecycle.viewModelScope
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.Job
+import kotlinx.coroutines.cancelAndJoin
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.combine
 import kotlinx.coroutines.flow.filterNotNull
@@ -16,6 +17,7 @@ import org.koitharu.kotatsu.list.ui.model.LoadingFooter
 import org.koitharu.kotatsu.list.ui.model.LoadingState
 import org.koitharu.kotatsu.tracker.domain.TrackingRepository
 import org.koitharu.kotatsu.tracker.ui.model.toFeedItem
+import org.koitharu.kotatsu.utils.SingleLiveEvent
 import org.koitharu.kotatsu.utils.ext.asLiveDataDistinct
 import org.koitharu.kotatsu.utils.ext.mapItems
 
@@ -29,6 +31,7 @@ class FeedViewModel(
 	private var loadingJob: Job? = null
 
 	val isEmptyState = MutableLiveData(false)
+	val onFeedCleared = SingleLiveEvent<Unit>()
 	val content = combine(
 		logList.filterNotNull().mapItems {
 			it.toFeedItem(context.resources)
@@ -40,7 +43,10 @@ class FeedViewModel(
 			isHasNextPage -> list + LoadingFooter
 			else -> list
 		}
-	}.asLiveDataDistinct(viewModelScope.coroutineContext + Dispatchers.Default, listOf(LoadingState))
+	}.asLiveDataDistinct(
+		viewModelScope.coroutineContext + Dispatchers.Default,
+		listOf(LoadingState)
+	)
 
 	init {
 		loadList(append = false)
@@ -62,4 +68,15 @@ class FeedViewModel(
 			hasNextPage.value = list.isNotEmpty()
 		}
 	}
+
+	fun clearFeed() {
+		val lastJob = loadingJob
+		loadingJob = launchLoadingJob(Dispatchers.Default) {
+			lastJob?.cancelAndJoin()
+			repository.clearLogs()
+			logList.value = emptyList()
+			isEmptyState.postValue(true)
+			onFeedCleared.postCall(Unit)
+		}
+	}
 }

app/src/main/java/org/koitharu/kotatsu/utils/ext/CollectionExt.kt

@@ -68,4 +68,24 @@ inline fun <T, reified R> Array<T>.mapToArray(transform: (T) -> R): Array<R> = A
 	transform(get(i))
 }
 
-fun <T : Enum<T>> Array<T>.names() = mapToArray { it.name }
+fun <T : Enum<T>> Array<T>.names() = mapToArray { it.name }
+
+fun <T> Collection<T>.isDistinct(): Boolean {
+	val set = HashSet<T>(size)
+	for (item in this) {
+		if (!set.add(item)) {
+			return false
+		}
+	}
+	return set.size == size
+}
+
+fun <T, K> Collection<T>.isDistinctBy(selector: (T) -> K): Boolean {
+	val set = HashSet<K>(size)
+	for (item in this) {
+		if (!set.add(selector(item))) {
+			return false
+		}
+	}
+	return set.size == size
+}

app/src/main/res/menu/opt_feed.xml

@@ -9,4 +9,10 @@
 		android:title="@string/update"
 		app:showAsAction="never" />
 
+	<item
+		android:id="@+id/action_clear_feed"
+		android:orderInCategory="50"
+		android:title="@string/clear_feed"
+		app:showAsAction="never" />
+
 </menu>

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

@@ -193,4 +193,6 @@
 	<string name="clear_cookies">Очистить куки</string>
 	<string name="cookies_cleared">Все куки удалены</string>
 	<string name="chapers_checking_progress">Проверка новых глав: %1$d из %2$d</string>
+	<string name="clear_feed">Очистить ленту</string>
+	<string name="text_clear_updates_feed_prompt">Вся история обновлений будет очищена и её нельзя будет вернуть. Вы уверены?</string>
 </resources>

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

@@ -195,4 +195,6 @@
 	<string name="clear_cookies">Clear cookies</string>
 	<string name="cookies_cleared">All cookies was removed</string>
 	<string name="chapers_checking_progress">Checking for new chapters: %1$d of %2$d</string>
+	<string name="clear_feed">Clear feed</string>
+	<string name="text_clear_updates_feed_prompt">All updates history will be cleared and this action cannot be undone. Are you sure?</string>
 </resources>