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diff --git a/web/chat/chat-message-list-container.react.js b/web/chat/chat-message-list-container.react.js
--- a/web/chat/chat-message-list-container.react.js
+++ b/web/chat/chat-message-list-container.react.js
@@ -8,16 +8,7 @@
import { NativeTypes } from 'react-dnd-html5-backend';
import { useDispatch } from 'react-redux';
-import { threadInfoSelector } from 'lib/selectors/thread-selectors.js';
-import { userInfoSelectorForPotentialMembers } from 'lib/selectors/user-selectors.js';
-import {
- useWatchThread,
- useExistingThreadInfoFinder,
- createPendingThread,
- threadIsPending,
-} from 'lib/shared/thread-utils.js';
-import { threadTypes } from 'lib/types/thread-types.js';
-import type { AccountUserInfo } from 'lib/types/user-types.js';
+import { useWatchThread, threadIsPending } from 'lib/shared/thread-utils.js';
import ChatInputBar from './chat-input-bar.react.js';
import css from './chat-message-list-container.css';
@@ -26,7 +17,10 @@
import ThreadTopBar from './thread-top-bar.react.js';
import { InputStateContext } from '../input/input-state.js';
import { updateNavInfoActionType } from '../redux/action-types.js';
-import { useSelector } from '../redux/redux-utils.js';
+import {
+ useThreadInfoForPossiblyPendingThread,
+ useInfosForPendingThread,
+} from '../utils/thread-utils.js';
type Props = {
+activeChatThreadID: string,
@@ -34,75 +28,14 @@
function ChatMessageListContainer(props: Props): React.Node {
const { activeChatThreadID } = props;
- const isChatCreation =
- useSelector(state => state.navInfo.chatMode) === 'create';
-
- const selectedUserIDs = useSelector(state => state.navInfo.selectedUserList);
- const otherUserInfos = useSelector(userInfoSelectorForPotentialMembers);
- const userInfoInputArray: $ReadOnlyArray<AccountUserInfo> = React.useMemo(
- () => selectedUserIDs?.map(id => otherUserInfos[id]).filter(Boolean) ?? [],
- [otherUserInfos, selectedUserIDs],
- );
- const viewerID = useSelector(state => state.currentUserInfo?.id);
- invariant(viewerID, 'should be set');
-
- const pendingPrivateThread = React.useRef(
- createPendingThread({
- viewerID,
- threadType: threadTypes.PRIVATE,
- }),
- );
-
- const newThreadID = 'pending/new_thread';
- const pendingNewThread = React.useMemo(
- () => ({
- ...createPendingThread({
- viewerID,
- threadType: threadTypes.PRIVATE,
- name: 'New thread',
- }),
- id: newThreadID,
- }),
- [viewerID],
- );
-
- const existingThreadInfoFinderForCreatingThread = useExistingThreadInfoFinder(
- pendingPrivateThread.current,
- );
-
- const baseThreadInfo = useSelector(state => {
- if (!activeChatThreadID) {
- return null;
- }
- return (
- threadInfoSelector(state)[activeChatThreadID] ??
- state.navInfo.pendingThread
- );
- });
- const existingThreadInfoFinder = useExistingThreadInfoFinder(baseThreadInfo);
- const threadInfo = React.useMemo(() => {
- if (isChatCreation) {
- if (userInfoInputArray.length === 0) {
- return pendingNewThread;
- }
-
- return existingThreadInfoFinderForCreatingThread({
- searching: true,
- userInfoInputArray,
- });
- }
-
- return existingThreadInfoFinder({
- searching: false,
- userInfoInputArray: [],
- });
- }, [
- existingThreadInfoFinder,
- existingThreadInfoFinderForCreatingThread,
+ const {
isChatCreation,
+ selectedUserIDs,
+ otherUserInfos,
userInfoInputArray,
- pendingNewThread,
- ]);
+ } = useInfosForPendingThread();
+
+ const threadInfo = useThreadInfoForPossiblyPendingThread(activeChatThreadID);
invariant(threadInfo, 'ThreadInfo should be set');
const dispatch = useDispatch();
diff --git a/web/utils/thread-utils.js b/web/utils/thread-utils.js
new file mode 100644
--- /dev/null
+++ b/web/utils/thread-utils.js
@@ -0,0 +1,108 @@
+// @flow
+
+import invariant from 'invariant';
+import * as React from 'react';
+
+import { threadInfoSelector } from 'lib/selectors/thread-selectors.js';
+import { userInfoSelectorForPotentialMembers } from 'lib/selectors/user-selectors.js';
+import {
+ createPendingThread,
+ useExistingThreadInfoFinder,
+} from 'lib/shared/thread-utils.js';
+import { threadTypes, type ThreadInfo } from 'lib/types/thread-types.js';
+import type { AccountUserInfo } from 'lib/types/user-types.js';
+
+import { useSelector } from '../redux/redux-utils.js';
+
+type InfosForPendingThread = {
+ +isChatCreation: boolean,
+ +selectedUserIDs: ?$ReadOnlyArray<string>,
+ +otherUserInfos: { [id: string]: AccountUserInfo },
+ +userInfoInputArray: $ReadOnlyArray<AccountUserInfo>,
+};
+
+function useInfosForPendingThread(): InfosForPendingThread {
+ const isChatCreation = useSelector(
+ state => state.navInfo.chatMode === 'create',
+ );
+ const selectedUserIDs = useSelector(state => state.navInfo.selectedUserList);
+ const otherUserInfos = useSelector(userInfoSelectorForPotentialMembers);
+ const userInfoInputArray: $ReadOnlyArray<AccountUserInfo> = React.useMemo(
+ () => selectedUserIDs?.map(id => otherUserInfos[id]).filter(Boolean) ?? [],
+ [otherUserInfos, selectedUserIDs],
+ );
+ return {
+ isChatCreation,
+ selectedUserIDs,
+ otherUserInfos,
+ userInfoInputArray,
+ };
+}
+
+function useThreadInfoForPossiblyPendingThread(
+ activeChatThreadID: string,
+): ?ThreadInfo {
+ const { isChatCreation, userInfoInputArray } = useInfosForPendingThread();
+ const viewerID = useSelector(state => state.currentUserInfo?.id);
+ invariant(viewerID, 'should be set');
+
+ const newThreadID = 'pending/new_thread';
+ const pendingNewThread = React.useMemo(
+ () => ({
+ ...createPendingThread({
+ viewerID,
+ threadType: threadTypes.PRIVATE,
+ name: 'New thread',
+ }),
+ id: newThreadID,
+ }),
+ [viewerID],
+ );
+ const pendingPrivateThread = React.useRef(
+ createPendingThread({
+ viewerID,
+ threadType: threadTypes.PRIVATE,
+ }),
+ );
+ const existingThreadInfoFinderForCreatingThread = useExistingThreadInfoFinder(
+ pendingPrivateThread.current,
+ );
+
+ const baseThreadInfo = useSelector(state => {
+ if (!activeChatThreadID) {
+ return null;
+ }
+ return (
+ threadInfoSelector(state)[activeChatThreadID] ??
+ state.navInfo.pendingThread
+ );
+ });
+ const existingThreadInfoFinder = useExistingThreadInfoFinder(baseThreadInfo);
+ const threadInfo = React.useMemo(() => {
+ if (isChatCreation) {
+ if (userInfoInputArray.length === 0) {
+ return pendingNewThread;
+ }
+
+ return existingThreadInfoFinderForCreatingThread({
+ searching: true,
+ userInfoInputArray,
+ });
+ }
+
+ return existingThreadInfoFinder({
+ searching: false,
+ userInfoInputArray: [],
+ });
+ }, [
+ existingThreadInfoFinder,
+ existingThreadInfoFinderForCreatingThread,
+ isChatCreation,
+ userInfoInputArray,
+ pendingNewThread,
+ ]);
+
+ return threadInfo;
+}
+
+export { useThreadInfoForPossiblyPendingThread, useInfosForPendingThread };

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