@prexo/ai-chat-sdk/dist/services/history/in-memory.js

AI Chat Component with Persistent History

import {
  DEFAULT_CHAT_SESSION_ID,
  DEFAULT_HISTORY_LENGTH
} from "../../lib/constants.js";
function getSessionKey(sessionId) {
  return DEFAULT_CHAT_SESSION_ID(sessionId);
}
function isLocalStorageAvailable() {
  try {
    return typeof window !== "undefined" && typeof window.localStorage !== "undefined";
  } catch {
    return false;
  }
}
function handleStorageError(error, context) {
  console.warn(`[InMemoryHistory] ${context}:`, error);
}
class InMemoryHistory {
  constructor() {
  }
  async addMessage(params) {
    if (!isLocalStorageAvailable()) {
      handleStorageError("localStorage not available", "addMessage");
      return;
    }
    const { message, sessionId } = params;
    const sessionKey = getSessionKey(sessionId);
    try {
      const item = window.localStorage.getItem(sessionKey);
      const oldMessages = item ? JSON.parse(item) : [];
      const newMessages = [message, ...oldMessages];
      window.localStorage.setItem(sessionKey, JSON.stringify(newMessages));
    } catch (error) {
      handleStorageError(error, "addMessage");
    }
  }
  async deleteMessages({ sessionId }) {
    if (!isLocalStorageAvailable()) {
      handleStorageError("localStorage not available", "deleteMessages");
      return;
    }
    const sessionKey = getSessionKey(sessionId);
    try {
      window.localStorage.setItem(sessionKey, JSON.stringify([]));
    } catch (error) {
      handleStorageError(error, "deleteMessages");
    }
  }
  async getMessages({
    sessionId,
    amount = DEFAULT_HISTORY_LENGTH,
    startIndex = 0
  }) {
    if (!isLocalStorageAvailable()) {
      handleStorageError("localStorage not available", "getMessages");
      return [];
    }
    const sessionKey = getSessionKey(sessionId || "");
    try {
      const item = window.localStorage.getItem(sessionKey);
      const messages = item ? JSON.parse(item) : [];
      const slicedMessages = messages.slice(startIndex, startIndex + amount);
      return slicedMessages.reverse();
    } catch (error) {
      handleStorageError(error, "getMessages");
      return [];
    }
  }
}
export {
  InMemoryHistory
};