feat: Update how messages load and sync, allow plugins to import messages

toju-app/src/app/domains/chat/feature/chat-messages/chat-messages.component.ts

@@ -8,6 +8,8 @@ import {
   inject,
   signal
 } from '@angular/core';
+import { toObservable, toSignal } from '@angular/core/rxjs-interop';
+import { switchMap } from 'rxjs/operators';
 import { Store } from '@ngrx/store';
 import { ElectronBridgeService } from '../../../../core/platform/electron/electron-bridge.service';
 import { ViewportService } from '../../../../core/platform';
@@ -18,7 +20,9 @@ import { KlipyGif, KlipyService } from '../../application/services/klipy.service
 import { MessagesActions } from '../../../../store/messages/messages.actions';
 import {
   selectAllMessages,
+  selectConversationExhausted,
   selectMessagesLoading,
+  selectMessagesLoadingOlder,
   selectMessagesSyncing
 } from '../../../../store/messages/messages.selectors';
 import { selectCurrentUser, selectIsCurrentUserAdmin } from '../../../../store/users/users.selectors';
@@ -72,6 +76,7 @@ export class ChatMessagesComponent {
 
   readonly loading = this.store.selectSignal(selectMessagesLoading);
   readonly syncing = this.store.selectSignal(selectMessagesSyncing);
+  readonly loadingOlder = this.store.selectSignal(selectMessagesLoadingOlder);
   readonly currentUser = this.store.selectSignal(selectCurrentUser);
   readonly isAdmin = this.store.selectSignal(selectIsCurrentUserAdmin);
 
@@ -83,6 +88,12 @@ export class ChatMessagesComponent {
   });
 
   readonly conversationKey = computed(() => `${this.currentRoom()?.id ?? 'no-room'}:${this.activeChannelId() ?? 'general'}`);
+  readonly conversationExhausted = toSignal(
+    toObservable(this.conversationKey).pipe(
+      switchMap((key) => this.store.select(selectConversationExhausted(key)))
+    ),
+    { initialValue: false }
+  );
   readonly klipyEnabled = computed(() => this.klipy.isEnabled(this.currentRoom()));
   readonly composerBottomPadding = signal(140);
   readonly klipyGifPickerAnchorRight = signal(16);
@@ -213,6 +224,22 @@ export class ChatMessagesComponent {
     );
   }
 
+  handleLoadOlderRequested(event: { beforeTimestamp: number; limit: number }): void {
+    const roomId = this.currentRoom()?.id;
+
+    if (!roomId)
+      return;
+
+    this.store.dispatch(
+      MessagesActions.loadOlderMessages({
+        roomId,
+        channelId: this.activeChannelId() ?? 'general',
+        beforeTimestamp: event.beforeTimestamp,
+        limit: event.limit
+      })
+    );
+  }
+
   toggleKlipyGifPicker(): void {
     const nextState = !this.showKlipyGifPicker();