import { useEffect, useRef, useState } from 'react';
import { useDispatch, useSelector } from 'react-redux';
import { NavLink, useNavigate } from 'react-router-dom';
import DocsGPT3 from './assets/cute_docsgpt3.svg';
import Documentation from './assets/documentation.svg';
import DocumentationDark from './assets/documentation-dark.svg';
import Discord from './assets/discord.svg';
import DiscordDark from './assets/discord-dark.svg';

import Arrow2 from './assets/dropdown-arrow.svg';
import Expand from './assets/expand.svg';
import Trash from './assets/trash.svg';
import Github from './assets/github.svg';
import GithubDark from './assets/github-dark.svg';
import Hamburger from './assets/hamburger.svg';
import HamburgerDark from './assets/hamburger-dark.svg';
import Info from './assets/info.svg';
import InfoDark from './assets/info-dark.svg';
import SettingGear from './assets/settingGear.svg';
import SettingGearDark from './assets/settingGear-dark.svg';
import Add from './assets/add.svg';
import UploadIcon from './assets/upload.svg';
import { ActiveState } from './models/misc';
import APIKeyModal from './preferences/APIKeyModal';
import {
  selectApiKeyStatus,
  selectSelectedDocs,
  selectSelectedDocsStatus,
  selectSourceDocs,
  setSelectedDocs,
  selectConversations,
  setConversations,
  selectConversationId,
} from './preferences/preferenceSlice';
import {
  setConversation,
  updateConversationId,
} from './conversation/conversationSlice';
import { useMediaQuery, useOutsideAlerter } from './hooks';
import Upload from './upload/Upload';
import { Doc, getConversations } from './preferences/preferenceApi';
import SelectDocsModal from './preferences/SelectDocsModal';
import ConversationTile from './conversation/ConversationTile';

interface NavigationProps {
  navOpen: boolean;
  setNavOpen: React.Dispatch<React.SetStateAction<boolean>>;
}

export default function Navigation({ navOpen, setNavOpen }: NavigationProps) {
  const dispatch = useDispatch();
  const docs = useSelector(selectSourceDocs);
  const selectedDocs = useSelector(selectSelectedDocs);
  const conversations = useSelector(selectConversations);
  const conversationId = useSelector(selectConversationId);
  const { isMobile } = useMediaQuery();
  const isDarkTheme = document.documentElement.classList.contains('dark');
  const [isDocsListOpen, setIsDocsListOpen] = useState(false);

  const isApiKeySet = useSelector(selectApiKeyStatus);
  const [apiKeyModalState, setApiKeyModalState] =
    useState<ActiveState>('INACTIVE');

  const isSelectedDocsSet = useSelector(selectSelectedDocsStatus);
  const [selectedDocsModalState, setSelectedDocsModalState] =
    useState<ActiveState>(isSelectedDocsSet ? 'INACTIVE' : 'ACTIVE');

  const [uploadModalState, setUploadModalState] =
    useState<ActiveState>('INACTIVE');

  const navRef = useRef(null);
  const apiHost = import.meta.env.VITE_API_HOST || 'https://docsapi.arc53.com';
  const embeddingsName =
    import.meta.env.VITE_EMBEDDINGS_NAME ||
    'huggingface_sentence-transformers/all-mpnet-base-v2';

  const navigate = useNavigate();

  useEffect(() => {
    if (!conversations) {
      fetchConversations();
    }
  }, [conversations, dispatch]);

  async function fetchConversations() {
    return await getConversations()
      .then((fetchedConversations) => {
        dispatch(setConversations(fetchedConversations));
      })
      .catch((error) => {
        console.error('Failed to fetch conversations: ', error);
      });
  }

  const handleDeleteConversation = (id: string) => {
    fetch(`${apiHost}/api/delete_conversation?id=${id}`, {
      method: 'POST',
    })
      .then(() => {
        fetchConversations();
      })
      .catch((error) => console.error(error));
  };

  const handleDeleteClick = (index: number, doc: Doc) => {
    const docPath = 'indexes/' + 'local' + '/' + doc.name;

    fetch(`${apiHost}/api/delete_old?path=${docPath}`, {
      method: 'GET',
    })
      .then(() => {
        // remove the image element from the DOM
        const imageElement = document.querySelector(
          `#img-${index}`,
        ) as HTMLElement;
        const parentElement = imageElement.parentNode as HTMLElement;
        parentElement.parentNode?.removeChild(parentElement);
      })
      .catch((error) => console.error(error));
  };

  const handleConversationClick = (index: string) => {
    // fetch the conversation from the server and setConversation in the store
    fetch(`${apiHost}/api/get_single_conversation?id=${index}`, {
      method: 'GET',
    })
      .then((response) => response.json())
      .then((data) => {
        navigate('/');
        dispatch(setConversation(data));
        dispatch(
          updateConversationId({
            query: { conversationId: index },
          }),
        );
      });
  };

  async function updateConversationName(updatedConversation: {
    name: string;
    id: string;
  }) {
    await fetch(`${apiHost}/api/update_conversation_name`, {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json',
      },
      body: JSON.stringify(updatedConversation),
    })
      .then((response) => response.json())
      .then((data) => {
        if (data) {
          navigate('/');
          fetchConversations();
        }
      })
      .catch((err) => {
        console.error(err);
      });
  }
  useOutsideAlerter(
    navRef,
    () => {
      if (isMobile && navOpen && apiKeyModalState === 'INACTIVE') {
        setNavOpen(false);
        setIsDocsListOpen(false);
      }
    },
    [navOpen, isDocsListOpen, apiKeyModalState],
  );

  /*
    Needed to fix bug where if mobile nav was closed and then window was resized to desktop, nav would still be closed but the button to open would be gone, as per #1 on issue #146
  */

  useEffect(() => {
    setNavOpen(!isMobile);
  }, [isMobile]);

  return (
    <>
      {!navOpen && (
        <button
          className="duration-25 absolute  top-3 left-3 z-20 hidden transition-all md:block"
          onClick={() => {
            setNavOpen(!navOpen);
          }}
        >
          <img
            src={Expand}
            alt="menu toggle"
            className={`${!navOpen ? 'rotate-180' : 'rotate-0'
              } m-auto transition-all duration-200`}
          />
        </button>
      )}
      <div
        ref={navRef}
        className={`${!navOpen && '-ml-96 md:-ml-[18rem]'
          } duration-20 fixed top-0 z-20 flex h-full w-72 flex-col border-r-[1px] border-b-0 dark:border-r-purple-taupe bg-white dark:bg-chinese-black transition-all dark:text-white`}
      >
        <div
          className={'visible mt-2 flex h-[6vh] w-full justify-between md:h-12'}
        >
          <div className="my-auto mx-4 flex cursor-pointer gap-1.5">
            <img className="mb-2 h-10" src={DocsGPT3} alt="" />
            <p className="my-auto text-2xl font-semibold">DocsGPT</p>
          </div>
          <button
            className="float-right mr-5"
            onClick={() => {
              setNavOpen(!navOpen);
            }}
          >
            <img
              src={Expand}
              alt="menu toggle"
              className={`${!navOpen ? 'rotate-180' : 'rotate-0'
                } m-auto transition-all duration-200`}
            />
          </button>
        </div>
        <NavLink
          to={'/'}
          onClick={() => {
            dispatch(setConversation([]));
            dispatch(
              updateConversationId({
                query: { conversationId: null },
              }),
            );
          }}
          className={({ isActive }) =>
            `${isActive ? 'bg-gray-3000 dark:bg-transparent' : ''
            } group sticky mx-4 mt-4 flex cursor-pointer gap-2.5 rounded-3xl border border-silver p-3 hover:border-rainy-gray dark:border-purple-taupe dark:text-white dark:hover:bg-transparent hover:bg-gray-3000`
          }
        >
          <img
            src={Add}
            alt="new"
            className="opacity-80 group-hover:opacity-100"
          />
          <p className=" text-sm text-dove-gray group-hover:text-neutral-600 dark:text-chinese-silver dark:group-hover:text-bright-gray">
            New Chat
          </p>
        </NavLink>
        <div className="mb-auto h-[56vh] overflow-x-hidden dark:text-white overflow-y-scroll">
          {conversations && (
            <div>
              <p className="ml-6 mt-3 text-sm font-semibold">Chats</p>
              <div className="conversations-container">
                {conversations?.map((conversation) => (
                  <ConversationTile
                    key={conversation.id}
                    conversation={conversation}
                    selectConversation={(id) => handleConversationClick(id)}
                    onDeleteConversation={(id) => handleDeleteConversation(id)}
                    onSave={(conversation) =>
                      updateConversationName(conversation)
                    }
                  />
                ))}
              </div>
            </div>
          )}
        </div>

        <div className="flex h-auto flex-col justify-end text-eerie-black dark:text-white">
          <div className="flex flex-col-reverse border-b-[1px] dark:border-b-purple-taupe">
            <div className="relative my-4 flex gap-2 px-2">
              <div
                className="flex h-12 w-5/6 cursor-pointer justify-between rounded-3xl border-2 dark:border-chinese-silver bg-white dark:bg-chinese-black"
                onClick={() => setIsDocsListOpen(!isDocsListOpen)}
              >
                {selectedDocs && (
                  <p className="my-3 mx-4 overflow-hidden text-ellipsis whitespace-nowrap">
                    {selectedDocs.name} {selectedDocs.version}
                  </p>
                )}
                <img
                  src={Arrow2}
                  alt="arrow"
                  className={`${!isDocsListOpen ? 'rotate-0' : 'rotate-180'
                    } ml-auto mr-3 w-3 transition-all`}
                />
              </div>
              <img
                className="mt-2 h-9 w-9 hover:cursor-pointer"
                src={UploadIcon}
                onClick={() => setUploadModalState('ACTIVE')}
              ></img>
              {isDocsListOpen && (
                <div className="absolute top-12 left-0 right-6 z-10 ml-2 mr-4 max-h-52 overflow-y-scroll bg-white dark:bg-chinese-black shadow-lg">
                  {docs ? (
                    docs.map((doc, index) => {
                      if (doc.model === embeddingsName) {
                        return (
                          <div
                            key={index}
                            onClick={() => {
                              dispatch(setSelectedDocs(doc));
                              setIsDocsListOpen(false);
                            }}
                            className="flex h-10 w-full cursor-pointer items-center justify-between border-x-2 border-b-[1px] dark:border-purple-taupe hover:bg-gray-100 dark:hover:bg-purple-taupe"
                          >
                            <p className="ml-5 flex-1 overflow-hidden overflow-ellipsis whitespace-nowrap py-3">
                              {doc.name} {doc.version}
                            </p>
                            {doc.location === 'local' && (
                              <img
                                src={Trash}
                                alt="Delete"
                                className="mr-4 h-4 w-4 cursor-pointer hover:opacity-50"
                                id={`img-${index}`}
                                onClick={(event) => {
                                  event.stopPropagation();
                                  handleDeleteClick(index, doc);
                                }}
                              />
                            )}
                          </div>
                        );
                      }
                    })
                  ) : (
                    <div className="h-10 w-full cursor-pointer  border-b-[1px] dark:border-b-purple-taupe hover:bg-gray-100">
                      <p className="ml-5 py-3">No default documentation.</p>
                    </div>
                  )}
                </div>
              )}
            </div>
            <p className="ml-6 mt-3 text-sm font-semibold">Source Docs</p>
          </div>
          <div className="flex flex-col gap-2 border-b-[1px] dark:border-b-purple-taupe py-2">
            <NavLink
              to="/settings"
              className={({ isActive }) =>
                `my-auto mx-4 flex h-9 cursor-pointer gap-4 rounded-3xl hover:bg-gray-100 dark:hover:bg-purple-taupe ${isActive ? 'bg-gray-3000 dark:bg-transparent' : ''
                }`
              }
            >
              <img
                src={isDarkTheme ? SettingGearDark : SettingGear}
                alt="settings"
                className="ml-2 w-5 opacity-60"
              />
              <p className="my-auto text-sm text-eerie-black  dark:text-white">Settings</p>
            </NavLink>
          </div>

          <div className="flex flex-col gap-2 border-b-[1.5px] dark:border-b-purple-taupe py-2">
            <NavLink
              to="/about"
              className={({ isActive }) =>
                `my-auto mx-4 flex h-9 cursor-pointer gap-4 rounded-3xl hover:bg-gray-100 dark:hover:bg-purple-taupe ${isActive ? 'bg-gray-3000 dark:bg-purple-taupe' : ''
                }`
              }
            >
              <img src={isDarkTheme ? InfoDark : Info} alt="info" className="ml-2 w-5" />
              <p className="my-auto text-sm">About</p>
            </NavLink>

            <a
              href="https://docs.docsgpt.co.uk/"
              target="_blank"
              rel="noreferrer"
              className="my-auto mx-4 flex h-9 cursor-pointer gap-4 rounded-3xl hover:bg-gray-100 dark:hover:bg-purple-taupe"
            >
              <img
                src={isDarkTheme ? DocumentationDark : Documentation}
                alt="documentation"
                className="ml-2 w-5"
              />
              <p className="my-auto text-sm ">Documentation</p>
            </a>
            <a
              href="https://discord.gg/WHJdfbQDR4"
              target="_blank"
              rel="noreferrer"
              className="my-auto mx-4 flex h-9 cursor-pointer gap-4 rounded-3xl hover:bg-gray-100 dark:hover:bg-purple-taupe"
            >
              <img src={isDarkTheme ? DiscordDark : Discord} alt="discord-link" className="ml-2 w-5" />
              <p className="my-auto text-sm">
                Visit our Discord
              </p>
            </a>

            <a
              href="https://github.com/arc53/DocsGPT"
              target="_blank"
              rel="noreferrer"
              className="mt-auto mx-4 flex h-9 cursor-pointer gap-4 rounded-3xl hover:bg-gray-100 dark:hover:bg-purple-taupe"
            >
              <img src={isDarkTheme ? GithubDark : Github} alt="github-link" className="ml-2 w-5" />
              <p className="my-auto text-sm">
                Visit our Github
              </p>
            </a>
          </div>
        </div>
      </div>
      <div className="fixed z-10 h-16 w-full border-b-2 dark:border-b-purple-taupe bg-gray-50 dark:bg-chinese-black md:hidden">
        <button
          className="mt-5 ml-6 h-6 w-6 md:hidden"
          onClick={() => setNavOpen(true)}
        >
          <img src={isDarkTheme ? HamburgerDark :Hamburger} alt="menu toggle" className="w-7" />
        </button>
      </div>
      <SelectDocsModal
        modalState={selectedDocsModalState}
        setModalState={setSelectedDocsModalState}
        isCancellable={isSelectedDocsSet}
      />
      <APIKeyModal
        modalState={apiKeyModalState}
        setModalState={setApiKeyModalState}
        isCancellable={isApiKeySet}
      />
      <Upload
        modalState={uploadModalState}
        setModalState={setUploadModalState}
      ></Upload>
    </>
  );
}