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import { useEffect, useRef } from 'react';

import { GetServerSideProps } from 'next';
import Head from 'next/head';
import {
    DEFAULT_SYSTEM_PROMPT,
    DEFAULT_TEMPERATURE,
    saveConversation,
    saveConversations,
    updateConversation,
    useCreateReducer
} from '@/utils';

import { Chat } from '@/components/Chat/Chat';

import HomeContext from './home.context';
import { HomeInitialState, initialState } from './home.state';

import { v4 as uuidv4 } from 'uuid';

interface Props {
  serverSideApiKeyIsSet: boolean;
  serverSidePluginKeysSet: boolean;
  defaultModelId: any;
}

const Home = ({
  defaultModelId,
}: Props) => {
  const contextValue = useCreateReducer<HomeInitialState>({
    initialState,
  });

  const {
    state: {
      lightMode,
      conversations,
      selectedConversation      
    },
    dispatch,
  } = contextValue;

  const stopConversationRef = useRef<boolean>(false);

  // FETCH MODELS ----------------------------------------------

  const handleSelectConversation = (conversation: any) => {
    dispatch({
      field: 'selectedConversation',
      value: conversation,
    });

    saveConversation(conversation);
  };

  // CONVERSATION OPERATIONS  --------------------------------------------

  const handleNewConversation = () => {
    const lastConversation = conversations[conversations.length - 1];

    const newConversation: any = {
      id: uuidv4(),
      name: 'New Conversation',
      messages: [],
      model: lastConversation?.model || {
        id: "OpenAIModels[defaultModelId].id",
        name: "OpenAIModels[defaultModelId].name",
        maxLength: "OpenAIModels[defaultModelId].maxLength",
        tokenLimit: "OpenAIModels[defaultModelId].tokenLimit",
      },
      prompt: DEFAULT_SYSTEM_PROMPT,
      temperature: lastConversation?.temperature ?? DEFAULT_TEMPERATURE,
      folderId: null,
    };

    const updatedConversations = [...conversations, newConversation];

    dispatch({ field: 'selectedConversation', value: newConversation });
    dispatch({ field: 'conversations', value: updatedConversations });

    saveConversation(newConversation);
    saveConversations(updatedConversations);

    dispatch({ field: 'loading', value: false });
  };

  const handleUpdateConversation = (
    conversation: any,
    data: any,
  ) => {
    const updatedConversation = {
      ...conversation,
      [data.key]: data.value,
    };

    const { single, all } = updateConversation(
      updatedConversation,
      conversations,
    );

    dispatch({ field: 'selectedConversation', value: single });
    dispatch({ field: 'conversations', value: all });
  };

  // EFFECTS  --------------------------------------------

  useEffect(() => {
    if (window.innerWidth < 640) {
      dispatch({ field: 'showChatbar', value: false });
    }
  }, [selectedConversation]);

  // ON LOAD --------------------------------------------

  return (
    <HomeContext.Provider
      value={{
        ...contextValue,
        handleNewConversation,
        handleSelectConversation,
        handleUpdateConversation,
      }}
    >
      <Head>
        <title>Web LLM Embed</title>
        <meta name="description" content="Web LLM Embed" />
        <meta
          name="viewport"
          content="height=device-height ,width=device-width, initial-scale=1, user-scalable=no"
        />
        <link rel="icon" href="/favicon.ico" />
      </Head>
      <main
          className={`flex h-screen w-screen flex-col text-sm text-white dark:text-white ${lightMode}`}
        >
          <div className="flex h-full w-full pt-[48px] sm:pt-0">
            <div className="flex flex-1">
              <Chat stopConversationRef={stopConversationRef} />
            </div>
          </div>
        </main>
    </HomeContext.Provider>
  );
};
export default Home;

export const getServerSideProps: GetServerSideProps = async ({ locale }) => {
  const defaultModelId = "fallbackModelID"

  return {
    props: {
      defaultModelId
    },
  };
};