Use shared recent emoji reactions from account data (#5402)

* Use shared recent emoji reactions from account data

- Add `AddRecentEmoji` and `GetRecentEmojis` use cases to avoid injecting the whole `MatrixClient` for just one of these operations.
- Update the UI and logic of the emoji picker and message context menu to include the recent emojis.
- Add `CoroutineDispatchers.Default` with the defaults coroutines to use in the app for ease of use.

* Instead of replacing suggested emojis, concatenate recent ones removing duplicates

* Update screenshots

---------

Co-authored-by: ElementBot <android@element.io>

libraries/core/src/main/kotlin/io/element/android/libraries/core/coroutine/CoroutineDispatchers.kt

@@ -8,9 +8,18 @@
 package io.element.android.libraries.core.coroutine
 
 import kotlinx.coroutines.CoroutineDispatcher
+import kotlinx.coroutines.Dispatchers
 
 data class CoroutineDispatchers(
     val io: CoroutineDispatcher,
     val computation: CoroutineDispatcher,
     val main: CoroutineDispatcher,
-)
+) {
+    companion object {
+        val Default = CoroutineDispatchers(
+            io = Dispatchers.IO,
+            computation = Dispatchers.Default,
+            main = Dispatchers.Main,
+        )
+    }
+}

libraries/matrix/api/src/main/kotlin/io/element/android/libraries/matrix/api/MatrixClient.kt

@@ -173,6 +173,16 @@ interface MatrixClient {
      * Returns the maximum file upload size allowed by the Matrix server.
      */
     suspend fun getMaxFileUploadSize(): Result<Long>
+
+    /**
+     * Returns the list of shared recent emoji reactions for this account.
+     */
+    suspend fun getRecentEmojis(): Result<List<String>>
+
+    /**
+     * Adds an emoji to the list of recent emoji reactions for this account.
+     */
+    suspend fun addRecentEmoji(emoji: String): Result<Unit>
 }
 
 /**

libraries/matrix/api/src/main/kotlin/io/element/android/libraries/matrix/api/recentemojis/AddRecentEmoji.kt

@@ -0,0 +1,23 @@
+/*
+ * Copyright 2025 New Vector Ltd.
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
+ * Please see LICENSE files in the repository root for full details.
+ */
+
+package io.element.android.libraries.matrix.api.recentemojis
+
+import dev.zacsweers.metro.Inject
+import io.element.android.libraries.core.coroutine.CoroutineDispatchers
+import io.element.android.libraries.matrix.api.MatrixClient
+import kotlinx.coroutines.withContext
+
+@Inject
+class AddRecentEmoji(
+    private val client: MatrixClient,
+    private val dispatchers: CoroutineDispatchers,
+) {
+    suspend operator fun invoke(emoji: String): Result<Unit> = withContext(dispatchers.io) {
+        client.addRecentEmoji(emoji)
+    }
+}

libraries/matrix/api/src/main/kotlin/io/element/android/libraries/matrix/api/recentemojis/GetRecentEmojis.kt

@@ -0,0 +1,30 @@
+/*
+ * Copyright 2025 New Vector Ltd.
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
+ * Please see LICENSE files in the repository root for full details.
+ */
+
+package io.element.android.libraries.matrix.api.recentemojis
+
+import dev.zacsweers.metro.ContributesBinding
+import dev.zacsweers.metro.Inject
+import io.element.android.libraries.core.coroutine.CoroutineDispatchers
+import io.element.android.libraries.di.SessionScope
+import io.element.android.libraries.matrix.api.MatrixClient
+import kotlinx.coroutines.withContext
+
+fun interface GetRecentEmojis {
+    suspend operator fun invoke(): Result<List<String>>
+}
+
+@ContributesBinding(SessionScope::class)
+@Inject
+class DefaultGetRecentEmojis(
+    private val client: MatrixClient,
+    private val dispatchers: CoroutineDispatchers,
+) : GetRecentEmojis {
+    override suspend operator fun invoke(): Result<List<String>> = withContext(dispatchers.io) {
+        client.getRecentEmojis()
+    }
+}

libraries/matrix/impl/src/main/kotlin/io/element/android/libraries/matrix/impl/RustMatrixClient.kt

@@ -708,6 +708,18 @@ class RustMatrixClient(
         runCatchingExceptions { innerClient.getMaxMediaUploadSize().toLong() }
     }
 
+    override suspend fun addRecentEmoji(emoji: String): Result<Unit> = withContext(sessionDispatcher) {
+        runCatchingExceptions {
+            innerClient.addRecentEmoji(emoji)
+        }
+    }
+
+    override suspend fun getRecentEmojis(): Result<List<String>> = withContext(sessionDispatcher) {
+        runCatchingExceptions {
+            innerClient.getRecentEmojis().map { it.emoji }
+        }
+    }
+
     private suspend fun File.getCacheSize(
         includeCryptoDb: Boolean = false,
     ): Long = withContext(sessionDispatcher) {

libraries/matrix/test/src/main/kotlin/io/element/android/libraries/matrix/test/FakeMatrixClient.kt

@@ -97,6 +97,8 @@ class FakeMatrixClient(
     override val ignoredUsersFlow: StateFlow<ImmutableList<UserId>> = MutableStateFlow(persistentListOf()),
     private val getMaxUploadSizeResult: () -> Result<Long> = { lambdaError() },
     private val getJoinedRoomIdsResult: () -> Result<Set<RoomId>> = { Result.success(emptySet()) },
+    private val getRecentEmojisLambda: () -> Result<List<String>> = { Result.success(emptyList()) },
+    private val addRecentEmojiLambda: (String) -> Result<Unit> = { Result.success(Unit) },
 ) : MatrixClient {
     var setDisplayNameCalled: Boolean = false
         private set
@@ -349,4 +351,12 @@ class FakeMatrixClient(
     override suspend fun getMaxFileUploadSize(): Result<Long> {
         return getMaxUploadSizeResult()
     }
+
+    override suspend fun addRecentEmoji(emoji: String): Result<Unit> {
+        return addRecentEmojiLambda(emoji)
+    }
+
+    override suspend fun getRecentEmojis(): Result<List<String>> {
+        return getRecentEmojisLambda()
+    }
 }