Consecutive playback and per-conversation playback rate

ts/state/selectors/audioPlayer.ts

@@ -1,8 +1,68 @@
-// Copyright 2021 Signal Messenger, LLC
+// Copyright 2021-2022 Signal Messenger, LLC
 // SPDX-License-Identifier: AGPL-3.0-only
 
+import { createSelector } from 'reselect';
+import { collectFirst } from '../../util/iterables';
 import type { StateType } from '../reducer';
+import { getConversations } from './conversations';
+import { getPropsForAttachment } from './message';
 
 export const isPaused = (state: StateType): boolean => {
-  return state.audioPlayer.activeAudioID === undefined;
+  return state.audioPlayer.active === undefined;
 };
+
+export const selectActiveVoiceNoteMessageId = (
+  state: StateType
+): string | undefined => state.audioPlayer.active?.id;
+
+export const selectNextConsecutiveVoiceNoteMessageId = createSelector(
+  getConversations,
+  selectActiveVoiceNoteMessageId,
+  (
+    conversations,
+    activeVoiceNoteMessageId
+  ): { id: string; url: string } | undefined => {
+    if (!activeVoiceNoteMessageId) {
+      return undefined;
+    }
+
+    const currentMessage =
+      conversations.messagesLookup[activeVoiceNoteMessageId];
+    const conversationMessages =
+      conversations.messagesByConversation[currentMessage.conversationId];
+
+    if (!conversationMessages) {
+      return undefined;
+    }
+
+    const idx = conversationMessages.messageIds.indexOf(
+      activeVoiceNoteMessageId
+    );
+    const nextIdx = idx + 1;
+
+    if (!(nextIdx in conversationMessages.messageIds)) {
+      return undefined;
+    }
+
+    const nextMessageId = conversationMessages.messageIds[nextIdx];
+    const nextMessage = conversations.messagesLookup[nextMessageId];
+
+    if (!nextMessage.attachments) {
+      return undefined;
+    }
+
+    const voiceNoteUrl = collectFirst(
+      nextMessage.attachments.map(getPropsForAttachment),
+      a => (a && a.isVoiceMessage && a.url ? a.url : undefined)
+    );
+
+    if (!voiceNoteUrl) {
+      return undefined;
+    }
+
+    return {
+      id: nextMessageId,
+      url: voiceNoteUrl,
+    };
+  }
+);