refactor(card-browser): initial selected deck

This should be a responsibility of the browser, not the destination

Assisted-by: Claude Opus 4.7

Author: david-allison

AnkiDroid/src/main/java/com/ichi2/anki/browser/BrowserDestination.kt

@@ -18,7 +18,6 @@ package com.ichi2.anki.browser
 
 import android.content.Context
 import android.content.Intent
-import com.ichi2.anki.AnkiDroidApp
 import com.ichi2.anki.CardBrowser
 import com.ichi2.anki.libanki.CardId
 import com.ichi2.anki.libanki.DeckId
@@ -31,10 +30,10 @@ sealed interface BrowserDestination : Destination {
     data class ToDeck(
         val deckId: DeckId,
     ) : BrowserDestination {
-        override fun toIntent(context: Context): Intent {
-            AnkiDroidApp.instance.sharedPrefsLastDeckIdRepository.lastDeckId = deckId
-            return Intent(context, CardBrowser::class.java)
-        }
+        override fun toIntent(context: Context): Intent =
+            Intent(context, CardBrowser::class.java).apply {
+                putExtra(CardBrowserViewModel.EXTRA_DECK_ID, deckId)
+            }
     }
 
     /**
@@ -45,12 +44,11 @@ sealed interface BrowserDestination : Destination {
         val deckId: DeckId,
         val cardId: CardId,
     ) : BrowserDestination {
-        override fun toIntent(context: Context): Intent {
-            AnkiDroidApp.instance.sharedPrefsLastDeckIdRepository.lastDeckId = deckId
-            return Intent(context, CardBrowser::class.java).apply {
+        override fun toIntent(context: Context): Intent =
+            Intent(context, CardBrowser::class.java).apply {
+                putExtra(CardBrowserViewModel.EXTRA_DECK_ID, deckId)
                 putExtra(EXTRA_CARD_ID_KEY, cardId)
             }
-        }
 
         companion object {
             const val EXTRA_CARD_ID_KEY = "cardId"

AnkiDroid/src/main/java/com/ichi2/anki/browser/CardBrowserViewModel.kt

@@ -395,7 +395,17 @@ class CardBrowserViewModel(
     suspend fun queryDataForCardEdit(id: CardOrNoteId): CardId? = id.toCardId(cardsOrNotes)
 
     private suspend fun getInitialDeck(): SelectableDeck {
-        // TODO: Handle the launch intent
+        suspend fun consumeIntentDeck(): SelectableDeck.Deck? {
+            if (savedStateHandle.get<Boolean>(STATE_LAUNCH_INTENT_CONSUMED) == true) return null
+            savedStateHandle[STATE_LAUNCH_INTENT_CONSUMED] = true
+            val deckId = savedStateHandle.get<Long>(EXTRA_DECK_ID) ?: return null
+            val name = withCol { decks.nameIfExists(deckId) } ?: return null
+            return SelectableDeck.Deck(deckId = deckId, name = name)
+        }
+
+        // Intent-supplied deck takes precedence, but only on the first launch
+        consumeIntentDeck()?.let { deck -> return deck }
+
         val lastDeckId = lastDeckId
         if (lastDeckId == ALL_DECKS_ID) {
             return SelectableDeck.AllDecks
@@ -1417,6 +1427,12 @@ class CardBrowserViewModel(
     suspend fun getAvailableDecks(): List<SelectableDeck.Deck> = SelectableDeck.fromCollection(includeFiltered = false)
 
     companion object {
+        /** Intent extra carrying the [DeckId] the browser should open scoped to. */
+        const val EXTRA_DECK_ID = "deckId"
+
+        /** Prevents one-shot extras from being re-applied after process death. */
+        private const val STATE_LAUNCH_INTENT_CONSUMED = "launchIntentConsumed"
+
         const val STATE_MULTISELECT = "multiselect"
         const val STATE_MULTISELECT_VALUES = "multiselect_values"
 

AnkiDroid/src/test/java/com/ichi2/anki/browser/CardBrowserViewModelTest.kt

@@ -403,6 +403,77 @@ class CardBrowserViewModelTest : JvmTest() {
             }
         }
 
+    @Test
+    fun `EXTRA_DECK_ID intent opens the specified deck`() =
+        runTest {
+            val deckId = addDeck("New")
+            val savedState = SavedStateHandle(mapOf(CardBrowserViewModel.EXTRA_DECK_ID to deckId))
+            viewModel(savedStateHandle = savedState).apply {
+                assertThat("intent deck is selected", deckId, equalTo(this.deckId))
+            }
+        }
+
+    @Test
+    fun `EXTRA_DECK_ID intent persists deck to lastDeckIdRepository`() =
+        runTest {
+            val deckId = addDeck("New")
+            val savedState = SavedStateHandle(mapOf(CardBrowserViewModel.EXTRA_DECK_ID to deckId))
+            viewModel(savedStateHandle = savedState).apply {
+                assertThat("deck persisted for next launch", lastDeckId, equalTo(deckId))
+            }
+        }
+
+    @Test
+    fun `no EXTRA_DECK_ID falls back to lastDeckIdRepository`() =
+        runTest {
+            val deckId = addDeck("Persisted")
+            viewModel(lastDeckId = deckId).apply {
+                assertThat("repository value is used", deckId, equalTo(this.deckId))
+            }
+        }
+
+    @Test
+    fun `EXTRA_DECK_ID for unknown deck falls back to lastDeckIdRepository`() =
+        runTest {
+            val persisted = addDeck("Persisted")
+            val unknownDeckId: DeckId = 9_999_999_999L
+            val savedState = SavedStateHandle(mapOf(CardBrowserViewModel.EXTRA_DECK_ID to unknownDeckId))
+            viewModel(lastDeckId = persisted, savedStateHandle = savedState).apply {
+                assertThat("unknown intent deck is ignored", persisted, equalTo(this.deckId))
+            }
+        }
+
+    @Test
+    fun `user deck change survives process death`() =
+        runTest {
+            val intentDeckId = addDeck("From intent")
+            val userDeckId = addDeck("User selection")
+            val savedState = SavedStateHandle(mapOf(CardBrowserViewModel.EXTRA_DECK_ID to intentDeckId))
+
+            val persistentRepo =
+                object : LastDeckIdRepository {
+                    override var lastDeckId: DeckId? = null
+                }
+
+            // setup: initial launch + select new deck
+            viewModel(
+                savedStateHandle = savedState,
+                lastDeckIdRepository = persistentRepo,
+            ).apply {
+                assertThat("intent honored on first launch", deckId, equalTo(intentDeckId))
+                setSelectedDeck(SelectableDeck.Deck(deckId = userDeckId, name = "User selection"))
+                assertThat("user choice persisted to repository", persistentRepo.lastDeckId, equalTo(userDeckId))
+            }
+
+            // intent does not override user selection
+            viewModel(
+                savedStateHandle = savedState,
+                lastDeckIdRepository = persistentRepo,
+            ).apply {
+                assertThat("user choice survives recreation", deckId, equalTo(userDeckId))
+            }
+        }
+
     @Test
     fun `sort order from notes is selected - 16514`() {
         col.config.set("sortType", "noteCrt")
@@ -1710,12 +1781,12 @@ class CardBrowserViewModelTest : JvmTest() {
             lastDeckId: DeckId? = null,
             intent: CardBrowserLaunchOptions? = null,
             mode: CardsOrNotes = CardsOrNotes.CARDS,
-        ): CardBrowserViewModel {
-            val lastDeckIdRepository =
+            savedStateHandle: SavedStateHandle = SavedStateHandle(),
+            lastDeckIdRepository: LastDeckIdRepository =
                 object : LastDeckIdRepository {
                     override var lastDeckId: DeckId? = lastDeckId
-                }
-
+                },
+        ): CardBrowserViewModel {
             // default is CARDS, do nothing in this case
             if (mode == CardsOrNotes.NOTES) {
                 CollectionManager.withCol { mode.saveToCollection(this@withCol) }
@@ -1728,7 +1799,7 @@ class CardBrowserViewModelTest : JvmTest() {
                 options = intent,
                 isFragmented = false,
                 preferences = AnkiDroidApp.sharedPreferencesProvider,
-                savedStateHandle = SavedStateHandle(),
+                savedStateHandle = savedStateHandle,
             ).apply {
                 invokeInitialSearch()
             }