@gameon/web/web-components/bot-client/firebase/firebase-instance.ts

Chat clients for web

import { FirebaseApp, FirebaseOptions, initializeApp } from 'firebase/app';
import {
  Firestore,
  collection,
  getFirestore,
  limit,
  onSnapshot,
  orderBy,
  query as firestoreQuery,
  QuerySnapshot,
  DocumentData,
  FirestoreError,
} from 'firebase/firestore';

export type ConversationData = {
  app: string;
  channel: string;
  conversationId?: string;
};

export class FirebaseInstance {
  constructor(firebaseConfig: FirebaseOptions) {
    this.app = initializeApp(firebaseConfig, 'on-chat-bot-client');
    this.store = getFirestore(this.app);
  }

  app: FirebaseApp;
  store: Firestore;

  getFirestoreConvoPath(conversationData: ConversationData) {
    return `channel:${conversationData.channel}:app:${conversationData.app}:conversations/conversation:${conversationData.conversationId}/events`;
  }

  listenToConvo(
    conversationData: ConversationData,
    messageHistoryLimit: number,
    onSuccess: (data: QuerySnapshot<DocumentData>) => void,
    onError: (error: FirestoreError) => void
  ) {
    const messagesRef = collection(
      this.store,
      this.getFirestoreConvoPath(conversationData)
    );

    const messagesQuery = firestoreQuery(
      messagesRef,
      orderBy('timestamp', 'desc'),
      limit(messageHistoryLimit)
    );

    onSnapshot(messagesQuery, onSuccess, onError);
  }
}