Move toju-app into own its folder

toju-app/src/app/store/messages/messages.selectors.ts

@@ -0,0 +1,87 @@
+import { createFeatureSelector, createSelector } from '@ngrx/store';
+import { MessagesState, messagesAdapter } from './messages.reducer';
+
+/** Selects the top-level messages feature state. */
+export const selectMessagesState = createFeatureSelector<MessagesState>('messages');
+
+const { selectIds, selectEntities, selectAll, selectTotal } = messagesAdapter.getSelectors();
+
+/** Selects all message entities as a flat array. */
+export const selectAllMessages = createSelector(selectMessagesState, selectAll);
+
+/** Selects the message entity dictionary keyed by ID. */
+export const selectMessagesEntities = createSelector(selectMessagesState, selectEntities);
+
+/** Selects all message IDs. */
+export const selectMessagesIds = createSelector(selectMessagesState, selectIds);
+
+/** Selects the total count of messages. */
+export const selectMessagesTotal = createSelector(selectMessagesState, selectTotal);
+
+/** Whether messages are currently being loaded from the database. */
+export const selectMessagesLoading = createSelector(
+  selectMessagesState,
+  (state) => state.loading
+);
+
+/** Selects the most recent messages-related error message. */
+export const selectMessagesError = createSelector(
+  selectMessagesState,
+  (state) => state.error
+);
+
+/** Whether a peer-to-peer message sync cycle is in progress. */
+export const selectMessagesSyncing = createSelector(
+  selectMessagesState,
+  (state) => state.syncing
+);
+
+/** Selects the ID of the room whose messages are currently loaded. */
+export const selectCurrentRoomId = createSelector(
+  selectMessagesState,
+  (state) => state.currentRoomId
+);
+
+/** Selects all messages belonging to the currently active room. */
+export const selectCurrentRoomMessages = createSelector(
+  selectAllMessages,
+  selectCurrentRoomId,
+  (messages, roomId) => roomId ? messages.filter((message) => message.roomId === roomId) : []
+);
+
+/** Creates a selector that returns messages for a specific text channel within the current room. */
+export const selectChannelMessages = (channelId: string) =>
+  createSelector(
+    selectAllMessages,
+    selectCurrentRoomId,
+    (messages, roomId) => {
+      if (!roomId)
+        return [];
+
+      return messages.filter(
+        (message) => message.roomId === roomId && (message.channelId || 'general') === channelId
+      );
+    }
+  );
+
+/** Creates a selector that returns a single message by its ID. */
+export const selectMessageById = (id: string) =>
+  createSelector(selectMessagesEntities, (entities) => entities[id]);
+
+/** Creates a selector that returns all messages for a specific room. */
+export const selectMessagesByRoomId = (roomId: string) =>
+  createSelector(selectAllMessages, (messages) =>
+    messages.filter((message) => message.roomId === roomId)
+  );
+
+/** Creates a selector that returns the N most recent messages. */
+export const selectRecentMessages = (limit: number) =>
+  createSelector(selectAllMessages, (messages) =>
+    messages.slice(-limit)
+  );
+
+/** Selects only messages that have at least one reaction. */
+export const selectMessagesWithReactions = createSelector(
+  selectAllMessages,
+  (messages) => messages.filter((message) => message.reactions.length > 0)
+);