Handle navigation to the same room.

features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/MessagesNode.kt

@@ -34,8 +34,10 @@ import io.element.android.features.messages.impl.timeline.di.LocalTimelineItemPr
 import io.element.android.features.messages.impl.timeline.di.TimelineItemPresenterFactories
 import io.element.android.features.messages.impl.timeline.model.TimelineItem
 import io.element.android.libraries.androidutils.system.openUrlInExternalApp
+import io.element.android.libraries.androidutils.system.toast
 import io.element.android.libraries.architecture.NodeInputs
 import io.element.android.libraries.core.bool.orFalse
+import io.element.android.libraries.di.ApplicationContext
 import io.element.android.libraries.di.RoomScope
 import io.element.android.libraries.matrix.api.core.EventId
 import io.element.android.libraries.matrix.api.core.RoomId
@@ -43,6 +45,7 @@ import io.element.android.libraries.matrix.api.core.UserId
 import io.element.android.libraries.matrix.api.permalink.PermalinkData
 import io.element.android.libraries.matrix.api.permalink.PermalinkParser
 import io.element.android.libraries.matrix.api.room.MatrixRoom
+import io.element.android.libraries.matrix.api.room.navigation.isSameRoom
 import io.element.android.libraries.matrix.api.room.roomMembers
 import io.element.android.libraries.matrix.api.timeline.item.TimelineItemDebugInfo
 import io.element.android.libraries.mediaplayer.api.MediaPlayer
@@ -60,6 +63,8 @@ class MessagesNode @AssistedInject constructor(
     private val timelineItemPresenterFactories: TimelineItemPresenterFactories,
     private val mediaPlayer: MediaPlayer,
     private val permalinkParser: PermalinkParser,
+    @ApplicationContext
+    private val context: Context,
 ) : Node(buildContext, plugins = plugins), MessagesNavigator {
     private val presenter = presenterFactory.create(this)
     private val callback = plugins<Callback>().firstOrNull()
@@ -124,8 +129,7 @@ class MessagesNode @AssistedInject constructor(
                 }
             }
             is PermalinkData.RoomLink -> {
-                // TODO Handle click on current Room
+                handleRoomLinkClicked(permalink)
-                callback?.onPermalinkClicked(permalink)
             }
             is PermalinkData.FallbackLink,
             is PermalinkData.RoomEmailInviteLink -> {
@@ -134,6 +138,20 @@ class MessagesNode @AssistedInject constructor(
         }
     }
 
+    private fun handleRoomLinkClicked(roomLink: PermalinkData.RoomLink) {
+        if (room.isSameRoom(roomLink.roomIdOrAlias)) {
+            if (roomLink.eventId != null) {
+                // TODO Handle navigation to the Event
+                context.toast("TODO Handle navigation to the Event ${roomLink.eventId}")
+            } else {
+                // Click on the same room, ignore
+                context.toast("Already viewing this room!")
+            }
+        } else {
+            callback?.onPermalinkClicked(roomLink)
+        }
+    }
+
     override fun onShowEventDebugInfoClicked(eventId: EventId?, debugInfo: TimelineItemDebugInfo) {
         callback?.onShowEventDebugInfoClicked(eventId, debugInfo)
     }

libraries/matrix/api/src/main/kotlin/io/element/android/libraries/matrix/api/room/navigation/Navigation.kt

@@ -0,0 +1,34 @@
+/*
+ * Copyright (c) 2024 New Vector Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.element.android.libraries.matrix.api.room.navigation
+
+import io.element.android.libraries.matrix.api.core.RoomIdOrAlias
+import io.element.android.libraries.matrix.api.room.MatrixRoom
+
+/**
+ * Return true if the given roomIdOrAlias is the same room as this room.
+ */
+fun MatrixRoom.isSameRoom(roomIdOrAlias: RoomIdOrAlias): Boolean {
+    return when (roomIdOrAlias) {
+        is RoomIdOrAlias.Id -> {
+            roomIdOrAlias.roomId == roomId
+        }
+        is RoomIdOrAlias.Alias -> {
+            roomIdOrAlias.roomAlias == alias || roomIdOrAlias.roomAlias in alternativeAliases
+        }
+    }
+}