feat(new reviewer): auto advance

This differs from the legacy reviewer in four things:

1. It implements `Show reminder` as an action (it is a tooltip in Anki, so I made it a snackbar here)
2. It doesn't follow the global switch in settings, as Anki desktop doesn't have one and users complained about finding the global setting unexpected
3. There is now a `Question action` setting
4. The legacy reviewer has an issue where the same configuration is carried through all cards in the review session. So if a card with a different deck config shows up, the config won't be respected. This is fixed in the new reviewer

AnkiDroid/src/main/java/com/ichi2/anki/ui/windows/reviewer/ReviewerFragment.kt

@@ -70,6 +70,13 @@ class ReviewerFragment :
         anchorView = this@ReviewerFragment.view?.findViewById(R.id.buttons_area)
     }
 
+    override fun onStop() {
+        super.onStop()
+        if (!requireActivity().isChangingConfigurations) {
+            viewModel.stopAutoAdvance()
+        }
+    }
+
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         super.onViewCreated(view, savedInstanceState)
 

AnkiDroid/src/main/java/com/ichi2/anki/ui/windows/reviewer/ReviewerViewModel.kt

@@ -38,6 +38,7 @@ import com.ichi2.anki.servicelayer.MARKED_TAG
 import com.ichi2.anki.servicelayer.NoteService
 import com.ichi2.anki.servicelayer.isBuryNoteAvailable
 import com.ichi2.anki.servicelayer.isSuspendNoteAvailable
+import com.ichi2.anki.ui.windows.reviewer.autoadvance.AutoAdvance
 import com.ichi2.libanki.ChangeManager
 import com.ichi2.libanki.hasTag
 import com.ichi2.libanki.note
@@ -78,6 +79,8 @@ class ReviewerViewModel(cardMediaPlayer: CardMediaPlayer) :
     private val stateMutationKey = TimeManager.time.intTimeMS().toString()
     val statesMutationEval = MutableSharedFlow<String>()
 
+    private val autoAdvance = AutoAdvance(this)
+
     /**
      * A flag that determines if the SchedulingStates in CurrentQueueState are
      * safe to persist in the database when answering a card. This is used to
@@ -98,6 +101,18 @@ class ReviewerViewModel(cardMediaPlayer: CardMediaPlayer) :
         launchCatchingIO {
             updateUndoAndRedoLabels()
         }
+        cardMediaPlayer.setOnSoundGroupCompletedListener {
+            launchCatchingIO {
+                if (!autoAdvance.shouldWaitForAudio()) {
+                    return@launchCatchingIO
+                }
+                if (showingAnswer.value) {
+                    autoAdvance.onShowAnswer()
+                } else {
+                    autoAdvance.onShowQuestion()
+                }
+            }
+        }
     }
 
     /* *********************************************************************************************
@@ -124,6 +139,9 @@ class ReviewerViewModel(cardMediaPlayer: CardMediaPlayer) :
             }
             showAnswerInternal()
             loadAndPlaySounds(CardSide.ANSWER)
+            if (!autoAdvance.shouldWaitForAudio()) {
+                autoAdvance.onShowAnswer()
+            } // else wait for onSoundGroupCompleted
         }
     }
 
@@ -266,6 +284,10 @@ class ReviewerViewModel(cardMediaPlayer: CardMediaPlayer) :
         }
     }
 
+    fun stopAutoAdvance() {
+        autoAdvance.cancelQuestionAndAnswerActionJobs()
+    }
+
     /* *********************************************************************************************
     *************************************** Internal methods ***************************************
     ********************************************************************************************* */
@@ -285,6 +307,9 @@ class ReviewerViewModel(cardMediaPlayer: CardMediaPlayer) :
     override suspend fun showQuestion() {
         super.showQuestion()
         runStateMutationHook()
+        if (!autoAdvance.shouldWaitForAudio()) {
+            autoAdvance.onShowQuestion()
+        } // else run in onSoundGroupCompleted
     }
 
     private suspend fun runStateMutationHook() {
@@ -356,6 +381,7 @@ class ReviewerViewModel(cardMediaPlayer: CardMediaPlayer) :
 
         val card = state.topCard
         currentCard = CompletableDeferred(card)
+        autoAdvance.onCardChange(card)
         showQuestion()
         loadAndPlaySounds(CardSide.QUESTION)
         updateMarkedStatus()

AnkiDroid/src/main/java/com/ichi2/anki/ui/windows/reviewer/autoadvance/AnswerAction.kt

@@ -0,0 +1,33 @@
+/*
+ *  Copyright (c) 2024 Brayan Oliveira <[email protected]>
+ *
+ *  This program is free software; you can redistribute it and/or modify it under
+ *  the terms of the GNU General Public License as published by the Free Software
+ *  Foundation; either version 3 of the License, or (at your option) any later
+ *  version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT ANY
+ *  WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+ *  PARTICULAR PURPOSE. See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with
+ *  this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.ichi2.anki.ui.windows.reviewer.autoadvance
+
+import com.ichi2.libanki.DeckConfig
+
+enum class AnswerAction(val configValue: Int) {
+    BURY_CARD(0),
+    ANSWER_AGAIN(1),
+    ANSWER_GOOD(2),
+    ANSWER_HARD(3),
+    SHOW_REMINDER(4);
+
+    companion object {
+        fun from(config: DeckConfig): AnswerAction {
+            val value = config.optInt("answerAction")
+            return entries.firstOrNull { it.configValue == value } ?: BURY_CARD
+        }
+    }
+}

AnkiDroid/src/main/java/com/ichi2/anki/ui/windows/reviewer/autoadvance/AutoAdvance.kt

@@ -0,0 +1,97 @@
+/*
+ *  Copyright (c) 2024 Brayan Oliveira <[email protected]>
+ *
+ *  This program is free software; you can redistribute it and/or modify it under
+ *  the terms of the GNU General Public License as published by the Free Software
+ *  Foundation; either version 3 of the License, or (at your option) any later
+ *  version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT ANY
+ *  WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+ *  PARTICULAR PURPOSE. See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with
+ *  this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.ichi2.anki.ui.windows.reviewer.autoadvance
+
+import com.ichi2.anki.CollectionManager.TR
+import com.ichi2.anki.asyncIO
+import com.ichi2.anki.launchCatchingIO
+import com.ichi2.anki.ui.windows.reviewer.ReviewerViewModel
+import com.ichi2.libanki.Card
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.delay
+
+/**
+ * Implementation of the `Auto Advance` deck options
+ *
+ * An user can set a timer to automatically trigger an action
+ * after showing a question ([QuestionAction]) or an answer ([AnswerAction]).
+ *
+ * If a timer is set to 0, nothing happens.
+ *
+ * @see AutoAdvanceSettings
+ */
+class AutoAdvance(val viewModel: ReviewerViewModel) {
+    private var questionActionJob: Job? = null
+    private var answerActionJob: Job? = null
+
+    private var settings = viewModel.asyncIO {
+        val card = viewModel.currentCard.await()
+        AutoAdvanceSettings.createInstance(card.currentDeckId().did)
+    }
+
+    private suspend fun durationToShowQuestionFor() = settings.await().durationToShowQuestionFor
+    private suspend fun durationToShowAnswerFor() = settings.await().durationToShowAnswerFor
+    private suspend fun questionAction() = settings.await().questionAction
+    private suspend fun answerAction() = settings.await().answerAction
+    suspend fun shouldWaitForAudio() = settings.await().waitForAudio
+
+    fun cancelQuestionAndAnswerActionJobs() {
+        questionActionJob?.cancel()
+        answerActionJob?.cancel()
+    }
+
+    fun onCardChange(card: Card) {
+        cancelQuestionAndAnswerActionJobs()
+        settings = viewModel.asyncIO {
+            AutoAdvanceSettings.createInstance(card.currentDeckId().did)
+        }
+    }
+
+    suspend fun onShowQuestion() {
+        answerActionJob?.cancel()
+        if (!durationToShowQuestionFor().isPositive()) return
+
+        questionActionJob = viewModel.launchCatchingIO {
+            delay(durationToShowQuestionFor())
+            when (questionAction()) {
+                QuestionAction.SHOW_ANSWER -> viewModel.showAnswer()
+                QuestionAction.SHOW_REMINDER -> showReminder(TR.studyingQuestionTimeElapsed())
+            }
+        }
+    }
+
+    suspend fun onShowAnswer() {
+        questionActionJob?.cancel()
+        if (!durationToShowAnswerFor().isPositive()) return
+
+        answerActionJob = viewModel.launchCatchingIO {
+            delay(durationToShowAnswerFor())
+            when (answerAction()) {
+                AnswerAction.BURY_CARD -> viewModel.buryCard()
+                AnswerAction.ANSWER_AGAIN -> viewModel.answerAgain()
+                AnswerAction.ANSWER_HARD -> viewModel.answerHard()
+                AnswerAction.ANSWER_GOOD -> viewModel.answerGood()
+                AnswerAction.SHOW_REMINDER -> showReminder(TR.studyingAnswerTimeElapsed())
+            }
+        }
+    }
+
+    private fun showReminder(message: String) {
+        viewModel.launchCatchingIO {
+            viewModel.actionFeedbackFlow.emit(message)
+        }
+    }
+}

AnkiDroid/src/main/java/com/ichi2/anki/ui/windows/reviewer/autoadvance/AutoAdvanceSettings.kt

@@ -0,0 +1,49 @@
+/*
+ *  Copyright (c) 2024 Brayan Oliveira <[email protected]>
+ *
+ *  This program is free software; you can redistribute it and/or modify it under
+ *  the terms of the GNU General Public License as published by the Free Software
+ *  Foundation; either version 3 of the License, or (at your option) any later
+ *  version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT ANY
+ *  WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+ *  PARTICULAR PURPOSE. See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with
+ *  this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.ichi2.anki.ui.windows.reviewer.autoadvance
+
+import com.ichi2.anki.CollectionManager.withCol
+import com.ichi2.anki.utils.ext.secondsToShowAnswer
+import com.ichi2.anki.utils.ext.secondsToShowQuestion
+import com.ichi2.libanki.DeckId
+import kotlin.time.Duration
+import kotlin.time.DurationUnit
+import kotlin.time.toDuration
+
+data class AutoAdvanceSettings(
+    val questionAction: QuestionAction,
+    val answerAction: AnswerAction,
+    val durationToShowQuestionFor: Duration,
+    val durationToShowAnswerFor: Duration,
+    val waitForAudio: Boolean
+) {
+    companion object {
+        suspend fun createInstance(deckId: DeckId): AutoAdvanceSettings {
+            val config = withCol { decks.configDictForDeckId(deckId) }
+            val questionAction = QuestionAction.from(config)
+            val answerAction = AnswerAction.from(config)
+            val waitForAudio = config.optBoolean("waitForAudio", true)
+
+            return AutoAdvanceSettings(
+                questionAction = questionAction,
+                answerAction = answerAction,
+                durationToShowQuestionFor = config.secondsToShowQuestion.toDuration(DurationUnit.SECONDS),
+                durationToShowAnswerFor = config.secondsToShowAnswer.toDuration(DurationUnit.SECONDS),
+                waitForAudio = waitForAudio
+            )
+        }
+    }
+}

AnkiDroid/src/main/java/com/ichi2/anki/ui/windows/reviewer/autoadvance/QuestionAction.kt

@@ -0,0 +1,30 @@
+/*
+ *  Copyright (c) 2024 Brayan Oliveira <[email protected]>
+ *
+ *  This program is free software; you can redistribute it and/or modify it under
+ *  the terms of the GNU General Public License as published by the Free Software
+ *  Foundation; either version 3 of the License, or (at your option) any later
+ *  version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT ANY
+ *  WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+ *  PARTICULAR PURPOSE. See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with
+ *  this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.ichi2.anki.ui.windows.reviewer.autoadvance
+
+import com.ichi2.libanki.DeckConfig
+
+enum class QuestionAction(val configValue: Int) {
+    SHOW_ANSWER(0),
+    SHOW_REMINDER(1);
+
+    companion object {
+        fun from(config: DeckConfig): QuestionAction {
+            val value = config.optInt("questionAction")
+            return entries.firstOrNull { it.configValue == value } ?: SHOW_ANSWER
+        }
+    }
+}