#2119 removed unnecessary states from history view model

core/src/main/java/org/kiwix/kiwixmobile/core/history/HistoryActivity.kt

@@ -37,8 +37,6 @@ import org.kiwix.kiwixmobile.core.history.viewmodel.Action.UserClickedDeleteSele
 import org.kiwix.kiwixmobile.core.history.viewmodel.Action.UserClickedShowAllToggle
 import org.kiwix.kiwixmobile.core.history.viewmodel.HistoryViewModel
 import org.kiwix.kiwixmobile.core.history.viewmodel.State
-import org.kiwix.kiwixmobile.core.history.viewmodel.State.Results
-import org.kiwix.kiwixmobile.core.history.viewmodel.State.SelectionResults
 import org.kiwix.kiwixmobile.core.utils.SimpleTextListener
 import javax.inject.Inject
 
@@ -128,24 +126,18 @@ class HistoryActivity : OnItemClickListener, BaseActivity() {
     return super.onOptionsItemSelected(item)
   }
 
-  private fun render(state: State) =
-    when (state) {
-      is Results -> {
-        actionMode?.finish()
+  private fun render(state: State) {
     historyAdapter.items = state.getHistoryListItems()
-        history_switch.isChecked = state.showAll
+    if (!state.isInSelectionState) {
+      actionMode?.finish()
       history_switch.isEnabled = true
-        toggleNoHistoryText(state)
-      }
-      is SelectionResults -> {
-        if (state.historyItems.any(HistoryItem::isSelected) && actionMode == null) {
+    } else {
+      if (actionMode == null) {
         actionMode = startSupportActionMode(actionModeCallback)
       }
-        historyAdapter.items = state.getHistoryListItems()
-        history_switch.isChecked = state.showAll
       history_switch.isEnabled = false
-        toggleNoHistoryText(state)
     }
+    toggleNoHistoryText(state)
   }
 
   private fun toggleNoHistoryText(state: State) {

core/src/main/java/org/kiwix/kiwixmobile/core/history/viewmodel/Action.kt

@@ -30,7 +30,6 @@ sealed class Action {
   data class OnItemClick(val historyItem: HistoryItem) : Action()
   data class OnItemLongClick(val historyItem: HistoryItem) : Action()
   data class UserClickedShowAllToggle(val isChecked: Boolean) : Action()
-  data class AllHistoryPreferenceChanged(val showAll: Boolean) : Action()
   data class Filter(val searchTerm: String) : Action()
   data class UpdateHistory(val history: List<HistoryItem>) : Action()
 }

core/src/main/java/org/kiwix/kiwixmobile/core/history/viewmodel/HistoryViewModel.kt

@@ -1,13 +1,12 @@
 package org.kiwix.kiwixmobile.core.history.viewmodel
 
-import org.kiwix.kiwixmobile.core.history.viewmodel.effects.OpenHistoryItem
 import androidx.lifecycle.MutableLiveData
 import androidx.lifecycle.ViewModel
 import io.reactivex.disposables.CompositeDisposable
 import io.reactivex.processors.PublishProcessor
+import io.reactivex.schedulers.Schedulers
 import org.kiwix.kiwixmobile.core.base.SideEffect
 import org.kiwix.kiwixmobile.core.dao.HistoryDao
-import org.kiwix.kiwixmobile.core.history.viewmodel.Action.AllHistoryPreferenceChanged
 import org.kiwix.kiwixmobile.core.history.viewmodel.Action.ExitActionModeMenu
 import org.kiwix.kiwixmobile.core.history.viewmodel.Action.ExitHistory
 import org.kiwix.kiwixmobile.core.history.viewmodel.Action.Filter
@@ -18,9 +17,8 @@ import org.kiwix.kiwixmobile.core.history.viewmodel.Action.UserClickedConfirmDel
 import org.kiwix.kiwixmobile.core.history.viewmodel.Action.UserClickedDeleteButton
 import org.kiwix.kiwixmobile.core.history.viewmodel.Action.UserClickedDeleteSelectedHistoryItems
 import org.kiwix.kiwixmobile.core.history.viewmodel.Action.UserClickedShowAllToggle
-import org.kiwix.kiwixmobile.core.history.viewmodel.State.Results
-import org.kiwix.kiwixmobile.core.history.viewmodel.State.SelectionResults
 import org.kiwix.kiwixmobile.core.history.viewmodel.effects.DeleteHistoryItems
+import org.kiwix.kiwixmobile.core.history.viewmodel.effects.OpenHistoryItem
 import org.kiwix.kiwixmobile.core.history.viewmodel.effects.ShowDeleteHistoryDialog
 import org.kiwix.kiwixmobile.core.history.viewmodel.effects.UpdateAllHistoryPreference
 import org.kiwix.kiwixmobile.core.reader.ZimReaderContainer
@@ -34,7 +32,7 @@ class HistoryViewModel @Inject constructor(
   private val sharedPreferenceUtil: SharedPreferenceUtil
 ) : ViewModel() {
   val state = MutableLiveData<State>().apply {
-    value = Results(emptyList(), sharedPreferenceUtil.showHistoryAllBooks, zimReaderContainer.id)
+    value = State(emptyList(), sharedPreferenceUtil.showHistoryAllBooks, zimReaderContainer.id)
   }
   val effects = PublishProcessor.create<SideEffect<*>>()
   val actions = PublishProcessor.create<Action>()
@@ -42,60 +40,36 @@ class HistoryViewModel @Inject constructor(
 
   init {
     compositeDisposable.addAll(
-      historyDao.history().subscribe { actions.offer(UpdateHistory(it)) },
-      sharedPreferenceUtil.showAllHistoryToggleSwitch.subscribe {
-        actions.offer(AllHistoryPreferenceChanged(it))
-      },
-      viewStateReducer()
+      viewStateReducer(),
+      historyDao.history().subscribeOn(Schedulers.io())
+        .subscribe({ actions.offer(UpdateHistory(it)) }, Throwable::printStackTrace)
     )
   }
 
   private fun viewStateReducer() =
-    actions.map { reduce(it, state.value!!) }.subscribe(state::postValue)
+    actions.map { reduce(it, state.value!!) }
+      .subscribe(state::postValue, Throwable::printStackTrace)
 
-  private fun reduce(action: Action, state: State): State =
-    when (action) {
+  private fun reduce(action: Action, state: State): State = when (action) {
     ExitHistory -> finishHistoryActivity(state)
     ExitActionModeMenu -> deselectAllHistoryItems(state)
     UserClickedConfirmDelete -> offerDeletionOfItems(state)
     UserClickedDeleteButton -> offerShowDeleteDialog(state)
     UserClickedDeleteSelectedHistoryItems -> offerShowDeleteDialog(state)
+    is UserClickedShowAllToggle -> offerUpdateToShowAllToggle(action, state)
     is OnItemClick -> handleItemClick(state, action)
     is OnItemLongClick -> handleItemLongClick(state, action)
-      is UserClickedShowAllToggle -> offerUpdateToShowAllToggle(action, state)
     is Filter -> updateHistoryItemsBasedOnFilter(state, action)
     is UpdateHistory -> updateHistoryList(state, action)
-      is AllHistoryPreferenceChanged -> changeShowHistoryToggle(state, action)
   }
 
   private fun updateHistoryItemsBasedOnFilter(state: State, action: Filter) =
-    when (state) {
-      is Results -> state.copy(searchTerm = action.searchTerm)
-      is SelectionResults -> state.copy(searchTerm = action.searchTerm)
-    }
-
-  private fun changeShowHistoryToggle(
-    state: State,
-    action: AllHistoryPreferenceChanged
-  ): State {
-    return when (state) {
-      is SelectionResults -> state
-      is Results -> state.copy(showAll = action.showAll)
-    }
-  }
+    state.copy(searchTerm = action.searchTerm)
 
   private fun updateHistoryList(
     state: State,
     action: UpdateHistory
-  ): State = when (state) {
-    is Results -> state.copy(historyItems = action.history)
-    is SelectionResults -> Results(
-      action.history,
-      state.showAll,
-      zimReaderContainer.id,
-      state.searchTerm
-    )
-  }
+  ): State = state.copy(historyItems = action.history)
 
   private fun offerUpdateToShowAllToggle(
     action: UserClickedShowAllToggle,
@@ -107,33 +81,23 @@ class HistoryViewModel @Inject constructor(
         action.isChecked
       )
     )
-    return when (state) {
-      is Results -> state.copy(showAll = action.isChecked)
-      else -> state
-    }
+    return state.copy(showAll = action.isChecked)
   }
 
   private fun handleItemLongClick(
     state: State,
     action: OnItemLongClick
-  ): State {
-    return when (state) {
-      is Results -> state.toggleSelectionOfItem(action.historyItem)
-      else -> state
-    }
-  }
+  ): State = state.toggleSelectionOfItem(action.historyItem)
 
   private fun handleItemClick(
     state: State,
     action: OnItemClick
   ): State {
-    return when (state) {
-      is Results -> {
+    if (state.isInSelectionState) {
       effects.offer(OpenHistoryItem(action.historyItem, zimReaderContainer))
-        state
-      }
-      is SelectionResults -> state.toggleSelectionOfItem(action.historyItem)
+      return state
     }
+    return state.toggleSelectionOfItem(action.historyItem)
   }
 
   private fun offerShowDeleteDialog(state: State): State {
@@ -142,31 +106,12 @@ class HistoryViewModel @Inject constructor(
   }
 
   private fun offerDeletionOfItems(state: State): State {
-    return when (state) {
-      is Results -> {
-        effects.offer(DeleteHistoryItems(state.historyItems, historyDao))
-        state
-      }
-      is SelectionResults -> {
-        effects.offer(DeleteHistoryItems(state.selectedItems, historyDao))
-        state
-      }
-    }
+    effects.offer(DeleteHistoryItems(state, historyDao))
+    return state
   }
 
-  private fun deselectAllHistoryItems(state: State): State {
-    return when (state) {
-      is SelectionResults -> {
-        Results(
-          state.historyItems.map { it.copy(isSelected = false) },
-          state.showAll,
-          state.currentZimId,
-          state.searchTerm
-        )
-      }
-      else -> state
-    }
-  }
+  private fun deselectAllHistoryItems(state: State): State =
+    state.copy(historyItems = state.historyItems.map { it.copy(isSelected = false) })
 
   private fun finishHistoryActivity(state: State): State {
     effects.offer(Finish)

core/src/main/java/org/kiwix/kiwixmobile/core/history/viewmodel/State.kt

@@ -25,13 +25,13 @@ import org.kiwix.kiwixmobile.core.history.adapter.HistoryListItem.HistoryItem
 import java.text.SimpleDateFormat
 import java.util.Locale
 
-sealed class State(
-  open val historyItems: List<HistoryItem>,
-  open val showAll: Boolean,
-  open val currentZimId: String?,
-  open val searchTerm: String = ""
+data class State(
+  val historyItems: List<HistoryItem>,
+  val showAll: Boolean,
+  val currentZimId: String?,
+  val searchTerm: String = ""
 ) {
-
+  val isInSelectionState = historyItems.any(HistoryItem::isSelected)
   private val dateFormatter = SimpleDateFormat("d MMM yyyy", Locale.getDefault())
 
   fun getHistoryListItems(): List<HistoryListItem> =
@@ -54,26 +54,6 @@ sealed class State(
         isSelected = !isSelected
       } else it
     }
-    if (newList.none(HistoryItem::isSelected)) {
-      return Results(newList, showAll, currentZimId, searchTerm)
-    }
-    return SelectionResults(newList, showAll, currentZimId, searchTerm)
-  }
-
-  data class Results(
-    override val historyItems: List<HistoryItem>,
-    override val showAll: Boolean,
-    override val currentZimId: String?,
-    override val searchTerm: String = ""
-  ) : State(historyItems, showAll, currentZimId, searchTerm)
-
-  data class SelectionResults(
-    override val historyItems: List<HistoryItem>,
-    override val showAll: Boolean,
-    override val currentZimId: String?,
-    override val searchTerm: String
-  ) : State(historyItems, showAll, currentZimId, searchTerm) {
-    val selectedItems: List<HistoryItem> =
-      getHistoryListItems().filterIsInstance<HistoryItem>().filter(HistoryItem::isSelected)
+    return State(newList, showAll, currentZimId, searchTerm)
   }
 }

core/src/main/java/org/kiwix/kiwixmobile/core/history/viewmodel/effects/DeleteHistoryItems.kt

@@ -22,12 +22,17 @@ import androidx.appcompat.app.AppCompatActivity
 import org.kiwix.kiwixmobile.core.base.SideEffect
 import org.kiwix.kiwixmobile.core.dao.HistoryDao
 import org.kiwix.kiwixmobile.core.history.adapter.HistoryListItem.HistoryItem
+import org.kiwix.kiwixmobile.core.history.viewmodel.State
 
 data class DeleteHistoryItems(
-  private val itemsToDelete: List<HistoryItem>,
+  private val state: State,
   private val historyDao: HistoryDao
 ) : SideEffect<Unit> {
   override fun invokeWith(activity: AppCompatActivity) {
-    historyDao.deleteHistory(itemsToDelete)
+    if (state.isInSelectionState) {
+      historyDao.deleteHistory(state.historyItems.filter(HistoryItem::isSelected))
+    } else {
+      historyDao.deleteHistory(state.historyItems)
+    }
   }
 }

core/src/main/java/org/kiwix/kiwixmobile/core/utils/SharedPreferenceUtil.java

@@ -61,11 +61,6 @@ public class SharedPreferenceUtil {
   private SharedPreferences sharedPreferences;
   private final PublishProcessor<String> prefStorages = PublishProcessor.create();
 
-  public PublishProcessor<Boolean> getShowAllHistoryToggleSwitch() {
-    return showAllHistoryToggleSwitch;
-  }
-
-  private final PublishProcessor<Boolean> showAllHistoryToggleSwitch = PublishProcessor.create();
   private final PublishProcessor<NightModeConfig.Mode> nightModes = PublishProcessor.create();
 
   @Inject
@@ -158,10 +153,6 @@ public class SharedPreferenceUtil {
     return prefStorages.startWith(getPrefStorage());
   }
 
-  public Flowable<Boolean> getShowAllHistoryToggleSwitches() {
-    return showAllHistoryToggleSwitch.startWith(getShowHistoryAllBooks());
-  }
-
   public void putPrefFullScreen(boolean fullScreen) {
     sharedPreferences.edit().putBoolean(PREF_FULLSCREEN, fullScreen).apply();
   }
@@ -186,7 +177,6 @@ public class SharedPreferenceUtil {
     sharedPreferences.edit()
       .putBoolean(PREF_SHOW_HISTORY_ALL_BOOKS, prefShowHistoryAllBooks)
       .apply();
-    showAllHistoryToggleSwitch.offer(prefShowHistoryAllBooks);
   }
 
   public boolean getShowBookmarksCurrentBook() {