// @flow

import Spinner from '@atlaskit/spinner';
import Bourne from '@hapi/bourne';
import { jitsiLocalStorage } from '@jitsi/js-utils/jitsi-local-storage';
import React, { useState, useEffect, useCallback, useRef } from 'react';
import uuid from 'uuid';

import { Dialog, hideDialog, openDialog } from '../../base/dialog';
import { translate } from '../../base/i18n';
import { Icon, IconCloseSmall, IconPlusCircle, IconShareDesktop } from '../../base/icons';
import { browser, JitsiTrackErrors } from '../../base/lib-jitsi-meet';
import { createLocalTrack } from '../../base/lib-jitsi-meet/functions';
import { VIDEO_TYPE } from '../../base/media';
import { connect } from '../../base/redux';
import { updateSettings } from '../../base/settings';
import { Tooltip } from '../../base/tooltip';
import { getLocalVideoTrack } from '../../base/tracks';
import { showErrorNotification } from '../../notifications';
import { toggleBackgroundEffect } from '../actions';
import { VIRTUAL_BACKGROUND_TYPE } from '../constants';
import { resizeImage, toDataURL } from '../functions';
import logger from '../logger';

import VirtualBackgroundPreview from './VirtualBackgroundPreview';


type Image = {
    tooltip?: string,
    id: string,
    src: string
}

// The limit of virtual background uploads is 24. When the number
// of uploads is 25 we trigger the deleteStoredImage function to delete
// the first/oldest uploaded background.
const backgroundsLimit = 25;
const images: Array<Image> = [
    {
        tooltip: 'image1',
        id: '1',
        src: 'images/virtual-background/background-1.jpg'
    },
    {
        tooltip: 'image2',
        id: '2',
        src: 'images/virtual-background/background-2.jpg'
    },
    {
        tooltip: 'image3',
        id: '3',
        src: 'images/virtual-background/background-3.jpg'
    },
    {
        tooltip: 'image4',
        id: '4',
        src: 'images/virtual-background/background-4.jpg'
    },
    {
        tooltip: 'image5',
        id: '5',
        src: 'images/virtual-background/background-5.jpg'
    },
    {
        tooltip: 'image6',
        id: '6',
        src: 'images/virtual-background/background-6.jpg'
    },
    {
        tooltip: 'image7',
        id: '7',
        src: 'images/virtual-background/background-7.jpg'
    }
];
type Props = {

    /**
     * The current local flip x status.
     */
    _localFlipX: boolean,

    /**
     * Returns the jitsi track that will have backgraund effect applied.
     */
    _jitsiTrack: Object,

    /**
     * Returns the selected thumbnail identifier.
     */
    _selectedThumbnail: string,

    /**
     * Returns the selected virtual background object.
     */
    _virtualBackground: Object,

    /**
     * The redux {@code dispatch} function.
     */
    dispatch: Function,

    /**
     * The initial options copied in the state for the {@code VirtualBackground} component.
     *
     * NOTE: currently used only for electron in order to open the dialog in the correct state after desktop sharing
     * selection.
     */
    initialOptions: Object,

    /**
     * Invoked to obtain translated strings.
     */
    t: Function
};

const onError = event => {
    event.target.style.display = 'none';
};


/**
 * Maps (parts of) the redux state to the associated props for the
 * {@code VirtualBackground} component.
 *
 * @param {Object} state - The Redux state.
 * @private
 * @returns {{Props}}
 */
function _mapStateToProps(state): Object {
    const { localFlipX } = state['features/base/settings'];

    return {
        _localFlipX: Boolean(localFlipX),
        _virtualBackground: state['features/virtual-background'],
        _selectedThumbnail: state['features/virtual-background'].selectedThumbnail,
        _jitsiTrack: getLocalVideoTrack(state['features/base/tracks'])?.jitsiTrack
    };
}

const VirtualBackgroundDialog = translate(connect(_mapStateToProps)(VirtualBackground));

/**
 * Renders virtual background dialog.
 *
 * @returns {ReactElement}
 */
function VirtualBackground({
    _localFlipX,
    _jitsiTrack,
    _selectedThumbnail,
    _virtualBackground,
    dispatch,
    initialOptions,
    t
}: Props) {
    const [ options, setOptions ] = useState({ ...initialOptions });
    const localImages = jitsiLocalStorage.getItem('virtualBackgrounds');
    const [ storedImages, setStoredImages ] = useState<Array<Image>>((localImages && Bourne.parse(localImages)) || []);
    const [ loading, setLoading ] = useState(false);
    const uploadImageButton: Object = useRef(null);
    const [ activeDesktopVideo ] = useState(_virtualBackground?.virtualSource?.videoType === VIDEO_TYPE.DESKTOP
        ? _virtualBackground.virtualSource
        : null);
    const [ initialVirtualBackground ] = useState(_virtualBackground);
    const deleteStoredImage = useCallback(e => {
        const imageId = e.currentTarget.getAttribute('data-imageid');

        setStoredImages(storedImages.filter(item => item.id !== imageId));
    }, [ storedImages ]);

    const deleteStoredImageKeyPress = useCallback(e => {
        if (e.key === ' ' || e.key === 'Enter') {
            e.preventDefault();
            deleteStoredImage(e);
        }
    }, [ deleteStoredImage ]);

    /**
     * Updates stored images on local storage.
     */
    useEffect(() => {
        try {
            jitsiLocalStorage.setItem('virtualBackgrounds', JSON.stringify(storedImages));
        } catch (err) {
            // Preventing localStorage QUOTA_EXCEEDED_ERR
            err && setStoredImages(storedImages.slice(1));
        }
        if (storedImages.length === backgroundsLimit) {
            setStoredImages(storedImages.slice(1));
        }
        if (!_localFlipX) {
            dispatch(updateSettings({
                localFlipX: !_localFlipX
            }));
        }
    }, [ storedImages, _localFlipX ]);


    const enableBlur = useCallback(async () => {
        setOptions({
            backgroundType: VIRTUAL_BACKGROUND_TYPE.BLUR,
            enabled: true,
            blurValue: 25,
            selectedThumbnail: 'blur'
        });
    }, []);

    const enableBlurKeyPress = useCallback(e => {
        if (e.key === ' ' || e.key === 'Enter') {
            e.preventDefault();
            enableBlur();
        }
    }, [ enableBlur ]);

    const enableSlideBlur = useCallback(async () => {
        setOptions({
            backgroundType: VIRTUAL_BACKGROUND_TYPE.BLUR,
            enabled: true,
            blurValue: 8,
            selectedThumbnail: 'slight-blur'
        });
    }, []);

    const enableSlideBlurKeyPress = useCallback(e => {
        if (e.key === ' ' || e.key === 'Enter') {
            e.preventDefault();
            enableSlideBlur();
        }
    }, [ enableSlideBlur ]);


    const shareDesktop = useCallback(async () => {
        let isCancelled = false, url;

        try {
            url = await createLocalTrack('desktop', '');
        } catch (e) {
            if (e.name === JitsiTrackErrors.SCREENSHARING_USER_CANCELED) {
                isCancelled = true;
            } else {
                logger.error(e);
            }
        }

        if (!url) {
            if (!isCancelled) {
                dispatch(showErrorNotification({
                    titleKey: 'virtualBackground.desktopShareError'
                }));
                logger.error('Could not create desktop share as a virtual background!');
            }

            /**
             * For electron createLocalTrack will open the {@code DesktopPicker} dialog and hide the
             * {@code VirtualBackgroundDialog}. That's why we need to reopen the {@code VirtualBackgroundDialog}
             * and restore the current state through {@code initialOptions} prop.
             */
            if (browser.isElectron()) {
                dispatch(openDialog(VirtualBackgroundDialog, { initialOptions: options }));
            }

            return;
        }

        const newOptions = {
            backgroundType: VIRTUAL_BACKGROUND_TYPE.DESKTOP_SHARE,
            enabled: true,
            selectedThumbnail: 'desktop-share',
            url
        };

        /**
         * For electron createLocalTrack will open the {@code DesktopPicker} dialog and hide the
         * {@code VirtualBackgroundDialog}. That's why we need to reopen the {@code VirtualBackgroundDialog}
         * and force it to show desktop share virtual background through {@code initialOptions} prop.
         */
        if (browser.isElectron()) {
            dispatch(openDialog(VirtualBackgroundDialog, { initialOptions: newOptions }));
        } else {
            setOptions(newOptions);
        }
    }, [ dispatch, options ]);

    const shareDesktopKeyPress = useCallback(e => {
        if (e.key === ' ' || e.key === 'Enter') {
            e.preventDefault();
            shareDesktop();
        }
    }, [ shareDesktop ]);

    const removeBackground = useCallback(async () => {
        setOptions({
            enabled: false,
            selectedThumbnail: 'none'
        });
    }, []);

    const removeBackgroundKeyPress = useCallback(e => {
        if (e.key === ' ' || e.key === 'Enter') {
            e.preventDefault();
            removeBackground();
        }
    }, [ removeBackground ]);

    const setUploadedImageBackground = useCallback(async e => {
        const imageId = e.currentTarget.getAttribute('data-imageid');
        const image = storedImages.find(img => img.id === imageId);

        if (image) {
            setOptions({
                backgroundType: 'image',
                enabled: true,
                url: image.src,
                selectedThumbnail: image.id
            });
        }
    }, [ storedImages ]);

    const setImageBackground = useCallback(async e => {
        const imageId = e.currentTarget.getAttribute('data-imageid');
        const image = images.find(img => img.id === imageId);

        if (image) {
            const url = await toDataURL(image.src);

            setOptions({
                backgroundType: 'image',
                enabled: true,
                url,
                selectedThumbnail: image.id
            });
            setLoading(false);
        }
    }, []);

    const uploadImage = useCallback(async e => {
        const reader = new FileReader();
        const imageFile = e.target.files;

        reader.readAsDataURL(imageFile[0]);
        reader.onload = async () => {
            const url = await resizeImage(reader.result);
            const uuId = uuid.v4();

            setStoredImages([
                ...storedImages,
                {
                    id: uuId,
                    src: url
                }
            ]);
            setOptions({
                backgroundType: VIRTUAL_BACKGROUND_TYPE.IMAGE,
                enabled: true,
                url,
                selectedThumbnail: uuId
            });
        };
        reader.onerror = () => {
            setLoading(false);
            logger.error('Failed to upload virtual image!');
        };
    }, [ dispatch, storedImages ]);

    const uploadImageKeyPress = useCallback(e => {
        if (uploadImageButton.current && (e.key === ' ' || e.key === 'Enter')) {
            e.preventDefault();
            uploadImageButton.current.click();
        }
    }, [ uploadImageButton.current ]);

    const setImageBackgroundKeyPress = useCallback(e => {
        if (e.key === ' ' || e.key === 'Enter') {
            e.preventDefault();
            setImageBackground(e);
        }
    }, [ setImageBackground ]);

    const setUploadedImageBackgroundKeyPress = useCallback(e => {
        if (e.key === ' ' || e.key === 'Enter') {
            e.preventDefault();
            setUploadedImageBackground(e);
        }
    }, [ setUploadedImageBackground ]);

    const applyVirtualBackground = useCallback(async () => {
        if (activeDesktopVideo) {
            await activeDesktopVideo.dispose();
        }
        setLoading(true);
        await dispatch(toggleBackgroundEffect(options, _jitsiTrack));
        await setLoading(false);
        dispatch(hideDialog());
    }, [ dispatch, options ]);

    // Prevent the selection of a new virtual background if it has not been applied by default
    const cancelVirtualBackground = useCallback(async () => {
        await setOptions({
            backgroundType: initialVirtualBackground.backgroundType,
            enabled: initialVirtualBackground.backgroundEffectEnabled,
            url: initialVirtualBackground.virtualSource,
            selectedThumbnail: initialVirtualBackground.selectedThumbnail,
            blurValue: initialVirtualBackground.blurValue
        });
        dispatch(hideDialog());
    });

    return (
        <Dialog
            hideCancelButton = { false }
            okKey = { 'virtualBackground.apply' }
            onCancel = { cancelVirtualBackground }
            onSubmit = { applyVirtualBackground }
            submitDisabled = { !options || loading }
            titleKey = { 'virtualBackground.title' } >
            <VirtualBackgroundPreview options = { options } />
            {loading ? (
                <div className = 'virtual-background-loading'>
                    <Spinner
                        isCompleting = { false }
                        size = 'medium' />
                </div>
            ) : (
                <div>
                    <label
                        aria-label = { t('virtualBackground.uploadImage') }
                        className = 'file-upload-label'
                        htmlFor = 'file-upload'
                        onKeyPress = { uploadImageKeyPress }
                        tabIndex = { 0 } >
                        <Icon
                            className = { 'add-background' }
                            size = { 20 }
                            src = { IconPlusCircle } />
                        {t('virtualBackground.addBackground')}
                    </label>
                    <input
                        accept = 'image/*'
                        className = 'file-upload-btn'
                        id = 'file-upload'
                        onChange = { uploadImage }
                        ref = { uploadImageButton }
                        type = 'file' />
                    <div
                        className = 'virtual-background-dialog'
                        role = 'radiogroup'
                        tabIndex = '-1'>
                        <Tooltip
                            content = { t('virtualBackground.removeBackground') }
                            position = { 'top' }>
                            <div
                                aria-checked = { _selectedThumbnail === 'none' }
                                aria-label = { t('virtualBackground.removeBackground') }
                                className = { _selectedThumbnail === 'none' ? 'background-option none-selected'
                                    : 'background-option virtual-background-none' }
                                onClick = { removeBackground }
                                onKeyPress = { removeBackgroundKeyPress }
                                role = 'radio'
                                tabIndex = { 0 } >
                                {t('virtualBackground.none')}
                            </div>
                        </Tooltip>
                        <Tooltip
                            content = { t('virtualBackground.slightBlur') }
                            position = { 'top' }>
                            <div
                                aria-checked = { _selectedThumbnail === 'slight-blur' }
                                aria-label = { t('virtualBackground.slightBlur') }
                                className = { _selectedThumbnail === 'slight-blur'
                                    ? 'background-option slight-blur-selected' : 'background-option slight-blur' }
                                onClick = { enableSlideBlur }
                                onKeyPress = { enableSlideBlurKeyPress }
                                role = 'radio'
                                tabIndex = { 0 }>
                                {t('virtualBackground.slightBlur')}
                            </div>
                        </Tooltip>
                        <Tooltip
                            content = { t('virtualBackground.blur') }
                            position = { 'top' }>
                            <div
                                aria-checked = { _selectedThumbnail === 'blur' }
                                aria-label = { t('virtualBackground.blur') }
                                className = { _selectedThumbnail === 'blur' ? 'background-option blur-selected'
                                    : 'background-option blur' }
                                onClick = { enableBlur }
                                onKeyPress = { enableBlurKeyPress }
                                role = 'radio'
                                tabIndex = { 0 }>
                                {t('virtualBackground.blur')}
                            </div>
                        </Tooltip>
                        <Tooltip
                            content = { t('virtualBackground.desktopShare') }
                            position = { 'top' }>
                            <div
                                aria-checked = { _selectedThumbnail === 'desktop-share' }
                                aria-label = { t('virtualBackground.desktopShare') }
                                className = { _selectedThumbnail === 'desktop-share'
                                    ? 'background-option desktop-share-selected'
                                    : 'background-option desktop-share' }
                                onClick = { shareDesktop }
                                onKeyPress = { shareDesktopKeyPress }
                                role = 'radio'
                                tabIndex = { 0 }>
                                <Icon
                                    className = 'share-desktop-icon'
                                    size = { 30 }
                                    src = { IconShareDesktop } />
                            </div>
                        </Tooltip>
                        {images.map(image => (
                            <Tooltip
                                content = { image.tooltip && t(`virtualBackground.${image.tooltip}`) }
                                key = { image.id }
                                position = { 'top' }>
                                <img
                                    alt = { image.tooltip && t(`virtualBackground.${image.tooltip}`) }
                                    aria-checked = { options.selectedThumbnail === image.id
                                        || _selectedThumbnail === image.id }
                                    className = {
                                        options.selectedThumbnail === image.id || _selectedThumbnail === image.id
                                            ? 'background-option thumbnail-selected' : 'background-option thumbnail' }
                                    data-imageid = { image.id }
                                    onClick = { setImageBackground }
                                    onError = { onError }
                                    onKeyPress = { setImageBackgroundKeyPress }
                                    role = 'radio'
                                    src = { image.src }
                                    tabIndex = { 0 } />
                            </Tooltip>
                        ))}
                        {storedImages.map((image, index) => (
                            <div
                                className = { 'thumbnail-container' }
                                key = { image.id }>
                                <img
                                    alt = { t('virtualBackground.uploadedImage', { index: index + 1 }) }
                                    aria-checked = { _selectedThumbnail === image.id }
                                    className = { _selectedThumbnail === image.id
                                        ? 'background-option thumbnail-selected' : 'background-option thumbnail' }
                                    data-imageid = { image.id }
                                    onClick = { setUploadedImageBackground }
                                    onError = { onError }
                                    onKeyPress = { setUploadedImageBackgroundKeyPress }
                                    role = 'radio'
                                    src = { image.src }
                                    tabIndex = { 0 } />

                                <Icon
                                    ariaLabel = { t('virtualBackground.deleteImage') }
                                    className = { 'delete-image-icon' }
                                    data-imageid = { image.id }
                                    onClick = { deleteStoredImage }
                                    onKeyPress = { deleteStoredImageKeyPress }
                                    role = 'button'
                                    size = { 15 }
                                    src = { IconCloseSmall }
                                    tabIndex = { 0 } />
                            </div>
                        ))}
                    </div>
                </div>
            )}
        </Dialog>
    );
}

export default VirtualBackgroundDialog;