/**
 * @fileoverview Message management hook
 * @module hooks/useMessages
 */

import { useCallback, useMemo } from "react";
import { useChatbot } from "./useChatbot";
import type { ConversationMessage } from "../core/contexts/ChatbotContext";

export interface UseMessagesReturn {
  messages: ConversationMessage[];
  sendMessage: (content: string) => Promise<ConversationMessage>;
  isProcessing: boolean;
  lastMessage: ConversationMessage | null;
  messageCount: number;
  getMessageHistory: (
    conversationId?: string
  ) => Promise<ConversationMessage[]>;
}

export function useMessages(): UseMessagesReturn {
  const {
    currentConversation,
    sendMessage,
    isProcessing,
    getConversationHistory,
  } = useChatbot();

  const messages = useMemo(() => {
    return currentConversation?.messages || [];
  }, [currentConversation]);

  const lastMessage = useMemo(() => {
    return messages[messages.length - 1] || null;
  }, [messages]);

  const messageCount = useMemo(() => messages.length, [messages]);

  return {
    messages,
    sendMessage,
    isProcessing,
    lastMessage,
    messageCount,
    getMessageHistory: getConversationHistory,
  };
}