import React, { useEffect, useRef, useState } from 'react';
import { useRouter } from 'next/router';
import { clearKeys, getKey, SESSION_KEYS } from 'utils/storage/sessionStorage';
import {
    File,
    getLocalFiles,
    deleteFiles,
    syncFiles,
} from 'services/fileService';
import styled from 'styled-components';
import LoadingBar from 'react-top-loading-bar';
import Collections from './components/Collections';
import Upload from './components/Upload';
import {
    Collection,
    syncCollections,
    CollectionAndItsLatestFile,
    getCollectionsAndTheirLatestFile,
    getFavItemIds,
    getLocalCollections,
    getNonEmptyCollections,
} from 'services/collectionService';
import constants from 'utils/strings/constants';
import { Alert } from 'react-bootstrap';
import billingService from 'services/billingService';
import PlanSelector from './components/PlanSelector';
import { checkSubscriptionPurchase } from 'utils/billingUtil';

import FullScreenDropZone from 'components/FullScreenDropZone';
import Sidebar from 'components/Sidebar';
import UploadButton from './components/UploadButton';
import { checkConnectivity } from 'utils/common';
import {
    isFirstLogin,
    justSignedUp,
    setIsFirstLogin,
    setJustSignedUp,
} from 'utils/storage';
import { isTokenValid, logoutUser } from 'services/userService';
import AlertBanner from './components/AlertBanner';
import MessageDialog, { MessageAttributes } from 'components/MessageDialog';
import { useDropzone } from 'react-dropzone';
import EnteSpinner from 'components/EnteSpinner';
import CollectionNamer, {
    CollectionNamerAttributes,
} from './components/CollectionNamer';
import CollectionSelector, {
    CollectionSelectorAttributes,
} from './components/CollectionSelector';
import { LoadingOverlay } from 'components/LoadingOverlay';
import PhotoFrame from 'components/PhotoFrame';
import { getSelectedFileIds } from 'utils/file';
import { addFilesToCollection } from 'utils/collection';
import SelectedFileOptions from './components/SelectedFileOptions';
import { errorCodes } from 'utils/common/errorUtil';
import SearchBar from 'components/SearchBar';

export enum FILE_TYPE {
    IMAGE,
    VIDEO,
    OTHERS,
}

export const DeadCenter = styled.div`
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    color: #fff;
    text-align: center;
    flex-direction: column;
`;

export type selectedState = {
    [k: number]: boolean;
    count: number;
};
export type SetFiles = React.Dispatch<React.SetStateAction<File[]>>;
export type SetCollections = React.Dispatch<React.SetStateAction<Collection[]>>;
export type SetLoading = React.Dispatch<React.SetStateAction<Boolean>>;

export default function Gallery() {
    const router = useRouter();
    const [collections, setCollections] = useState<Collection[]>([]);
    const [collectionsAndTheirLatestFile, setCollectionsAndTheirLatestFile] =
        useState<CollectionAndItsLatestFile[]>([]);
    const [files, setFiles] = useState<File[]>(null);
    const [favItemIds, setFavItemIds] = useState<Set<number>>();
    const [bannerMessage, setBannerMessage] = useState<string>(null);
    const [sinceTime, setSinceTime] = useState(0);
    const [isFirstLoad, setIsFirstLoad] = useState(false);
    const [isFirstFetch, setIsFirstFetch] = useState(false);
    const [selected, setSelected] = useState<selectedState>({ count: 0 });
    const [dialogMessage, setDialogMessage] = useState<MessageAttributes>();
    const [dialogView, setDialogView] = useState(false);
    const [planModalView, setPlanModalView] = useState(false);
    const [loading, setLoading] = useState(false);
    const [collectionSelectorAttributes, setCollectionSelectorAttributes] =
        useState<CollectionSelectorAttributes>(null);
    const [collectionSelectorView, setCollectionSelectorView] = useState(false);

    const [collectionNamerAttributes, setCollectionNamerAttributes] =
        useState<CollectionNamerAttributes>(null);
    const [collectionNamerView, setCollectionNamerView] = useState(false);
    const {
        getRootProps,
        getInputProps,
        open: openFileUploader,
        acceptedFiles,
    } = useDropzone({
        noClick: true,
        noKeyboard: true,
        accept: 'image/*, video/*, application/json, ',
    });

    const loadingBar = useRef(null);
    const [searchMode, setSearchMode] = useState(false);
    useEffect(() => {
        const key = getKey(SESSION_KEYS.ENCRYPTION_KEY);
        if (!key) {
            router.push('/');
            return;
        }
        const main = async () => {
            setIsFirstLoad(isFirstLogin());
            setIsFirstFetch(false);
            if (justSignedUp()) {
                setPlanModalView(true);
            }
            setIsFirstLogin(false);
            const files = await getLocalFiles();
            const collections = await getLocalCollections();
            const nonEmptyCollections = getNonEmptyCollections(
                collections,
                files
            );
            const collectionsAndTheirLatestFile =
                await getCollectionsAndTheirLatestFile(
                    nonEmptyCollections,
                    files
                );
            setFiles(files);
            setCollections(nonEmptyCollections);
            setCollectionsAndTheirLatestFile(collectionsAndTheirLatestFile);
            const favItemIds = await getFavItemIds(files);
            setFavItemIds(favItemIds);
            await checkSubscriptionPurchase(setDialogMessage, router);
            await syncWithRemote();
            setIsFirstLoad(false);
            setJustSignedUp(false);
            setIsFirstFetch(false);
        };
        main();
    }, []);

    useEffect(() => setDialogView(true), [dialogMessage]);
    useEffect(
        () => setCollectionSelectorView(true),
        [collectionSelectorAttributes]
    );
    useEffect(() => setCollectionNamerView(true), [collectionNamerAttributes]);

    const syncWithRemote = async () => {
        try {
            checkConnectivity();
            if (!(await isTokenValid())) {
                throw new Error(errorCodes.ERR_SESSION_EXPIRED);
            }
            loadingBar.current?.continuousStart();
            await billingService.updatePlans();
            await billingService.syncSubscription();
            const collections = await syncCollections();
            const { files, isUpdated } = await syncFiles(collections);
            const nonEmptyCollections = getNonEmptyCollections(
                collections,
                files
            );
            const collectionAndItsLatestFile =
                await getCollectionsAndTheirLatestFile(
                    nonEmptyCollections,
                    files
                );
            const favItemIds = await getFavItemIds(files);
            setCollections(nonEmptyCollections);
            if (isUpdated) {
                setFiles(files);
            }
            setCollectionsAndTheirLatestFile(collectionAndItsLatestFile);
            setFavItemIds(favItemIds);
            setSinceTime(new Date().getTime());
        } catch (e) {
            switch (e.message) {
                case errorCodes.ERR_SESSION_EXPIRED:
                    setBannerMessage(constants.SESSION_EXPIRED_MESSAGE);
                    setDialogMessage({
                        title: constants.SESSION_EXPIRED,
                        content: constants.SESSION_EXPIRED_MESSAGE,
                        staticBackdrop: true,
                        proceed: {
                            text: constants.LOGIN,
                            action: logoutUser,
                            variant: 'primary',
                        },
                        nonClosable: true,
                    });
                    break;
                case errorCodes.ERR_NO_INTERNET_CONNECTION:
                    setBannerMessage(constants.NO_INTERNET_CONNECTION);
                    break;
                case errorCodes.ERR_KEY_MISSING:
                    clearKeys();
                    router.push('/credentials');
                    break;
            }
        } finally {
            loadingBar.current?.complete();
        }
    };

    const clearSelection = function () {
        setSelected({ count: 0 });
    };

    const selectCollection = (id?: number) => {
        const href = `/gallery?collection=${id || ''}`;
        router.push(href, undefined, { shallow: true });
    };

    if (!files) {
        return <div />;
    }
    const addToCollectionHelper = (
        collectionName: string,
        collection: Collection
    ) => {
        loadingBar.current?.continuousStart();
        addFilesToCollection(
            setCollectionSelectorView,
            selected,
            files,
            clearSelection,
            syncWithRemote,
            selectCollection,
            collectionName,
            collection
        );
    };

    const showCreateCollectionModal = () =>
        setCollectionNamerAttributes({
            title: constants.CREATE_COLLECTION,
            buttonText: constants.CREATE,
            autoFilledName: '',
            callback: (collectionName) =>
                addToCollectionHelper(collectionName, null),
        });

    const deleteFileHelper = () => {
        loadingBar.current?.continuousStart();
        deleteFiles(
            getSelectedFileIds(selected),
            clearSelection,
            syncWithRemote
        );
    };
    const updateFiles = (files: File[]) => {
        setFiles(files);
        setSinceTime(new Date().getTime());
        selectCollection(null);
    };
    return (
        <FullScreenDropZone
            getRootProps={getRootProps}
            getInputProps={getInputProps}
            showCollectionSelector={setCollectionSelectorView.bind(null, true)}
        >
            {loading && (
                <LoadingOverlay>
                    <EnteSpinner />
                </LoadingOverlay>
            )}
            <LoadingBar color="#2dc262" ref={loadingBar} />
            {isFirstLoad && (
                <div className="text-center">
                    <Alert variant="success">
                        {constants.INITIAL_LOAD_DELAY_WARNING}
                    </Alert>
                </div>
            )}
            <PlanSelector
                modalView={planModalView}
                closeModal={() => setPlanModalView(false)}
                setDialogMessage={setDialogMessage}
                setLoading={setLoading}
            />
            <AlertBanner bannerMessage={bannerMessage} />
            <MessageDialog
                size={'lg'}
                show={dialogView}
                onHide={() => setDialogView(false)}
                attributes={dialogMessage}
            />
            <SearchBar
                isOpen={searchMode}
                setOpen={setSearchMode}
                loadingBar={loadingBar}
                isFirstFetch={isFirstFetch}
                setFiles={updateFiles}
                setCollections={setCollections}
            />
            <Collections
                collections={collections}
                selected={Number(router.query.collection)}
                selectCollection={selectCollection}
                syncWithRemote={syncWithRemote}
                setDialogMessage={setDialogMessage}
                setCollectionNamerAttributes={setCollectionNamerAttributes}
                startLoadingBar={loadingBar.current?.continuousStart}
            />
            <CollectionNamer
                show={collectionNamerView}
                onHide={setCollectionNamerView.bind(null, false)}
                attributes={collectionNamerAttributes}
            />
            <CollectionSelector
                show={collectionSelectorView}
                onHide={setCollectionSelectorView.bind(null, false)}
                collectionsAndTheirLatestFile={collectionsAndTheirLatestFile}
                directlyShowNextModal={
                    collectionsAndTheirLatestFile?.length === 0
                }
                attributes={collectionSelectorAttributes}
            />
            <Upload
                syncWithRemote={syncWithRemote}
                setBannerMessage={setBannerMessage}
                acceptedFiles={acceptedFiles}
                existingFiles={files}
                setCollectionSelectorAttributes={
                    setCollectionSelectorAttributes
                }
                closeCollectionSelector={setCollectionSelectorView.bind(
                    null,
                    false
                )}
                setLoading={setLoading}
                setCollectionNamerAttributes={setCollectionNamerAttributes}
                setDialogMessage={setDialogMessage}
            />
            <Sidebar
                files={files}
                collections={collections}
                setDialogMessage={setDialogMessage}
                showPlanSelectorModal={() => setPlanModalView(true)}
            />
            <UploadButton openFileUploader={openFileUploader} />
            <PhotoFrame
                files={files}
                setFiles={setFiles}
                syncWithRemote={syncWithRemote}
                favItemIds={favItemIds}
                sinceTime={sinceTime}
                setSelected={setSelected}
                selected={selected}
                isFirstLoad={isFirstLoad}
                openFileUploader={openFileUploader}
                loadingBar={loadingBar}
                searchMode={searchMode}
            />
            {selected.count > 0 && (
                <SelectedFileOptions
                    addToCollectionHelper={addToCollectionHelper}
                    showCreateCollectionModal={showCreateCollectionModal}
                    setDialogMessage={setDialogMessage}
                    setCollectionSelectorAttributes={
                        setCollectionSelectorAttributes
                    }
                    deleteFileHelper={deleteFileHelper}
                />
            )}
        </FullScreenDropZone>
    );
}