nexo/apps/mattermost/app/utils/gallery/index.ts

// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
// See LICENSE.txt for license information.

import {Image} from 'expo-image';
import React, {type RefObject} from 'react';
import {Keyboard, View} from 'react-native';
import {measure, type AnimatedRef} from 'react-native-reanimated';

import {Screens} from '@constants';
import {SNACK_BAR_TYPE} from '@constants/snack_bar';
import {navigateToScreen} from '@screens/navigation';
import EphemeralStore from '@store/ephemeral_store';
import {isImage, isVideo} from '@utils/file';
import {generateId} from '@utils/general';
import {urlSafeBase64Encode} from '@utils/security';
import {showSnackBar} from '@utils/snack_bar';

import type {GalleryItemType, GalleryManagerSharedValues} from '@typings/screens/gallery';

export const clamp = (value: number, lowerBound: number, upperBound: number) => {
    'worklet';

    return Math.min(Math.max(lowerBound, value), upperBound);
};

export const clampVelocity = (velocity: number, minVelocity: number, maxVelocity: number) => {
    'worklet';

    if (velocity > 0) {
        return Math.min(Math.max(velocity, minVelocity), maxVelocity);
    }
    return Math.max(Math.min(velocity, -minVelocity), -maxVelocity);
};

export const fileToGalleryItem = (file: FileInfo, authorId?: string, postProps?: Record<string, unknown>, lastPictureUpdate = 0, cacheKey: string = file.id || ''): GalleryItemType => {
    let type: GalleryItemType['type'] = 'file';
    if (isVideo(file)) {
        type = 'video';
    } else if (isImage(file)) {
        type = 'image';
    }

    return {
        authorId,
        extension: file.extension,
        height: file.height,
        id: file.id || generateId('uid'),
        lastPictureUpdate,
        mime_type: file.mime_type,
        name: file.name,
        posterUri: type === 'video' ? file.mini_preview : undefined, // set the video poster to the mini_preview
        postId: file.post_id,
        size: file.size,
        type,
        uri: file.localPath || file.uri || '',
        width: file.width,
        postProps: postProps || file.postProps,
        cacheKey,
    };
};

export const friction = (value: number) => {
    'worklet';

    const MAX_FRICTION = 30;
    const MAX_VALUE = 200;

    const res = Math.max(
        1,
        Math.min(
            MAX_FRICTION,
            (1 + (Math.abs(value) * (MAX_FRICTION - 1))) / MAX_VALUE,
        ),
    );

    return value > 0 ? res : -res;
};

export const galleryItemToFileInfo = (item: GalleryItemType): FileInfo => ({
    id: item.id,
    name: item.name,
    create_at: 0,
    delete_at: 0,
    update_at: 0,
    width: item.width,
    height: item.height,
    extension: item.extension || '',
    mime_type: item.mime_type,
    has_preview_image: false,
    post_id: item.postId!,
    size: 0,
    user_id: item.authorId!,
});

export const getShouldRender = (index: number, activeIndex: number, diffValue = 3) => {
    const diff = Math.abs(index - activeIndex);

    if (diff > diffValue) {
        return false;
    }

    return true;
};

export function measureItem(ref: AnimatedRef<any>, sharedValues: GalleryManagerSharedValues) {
    'worklet';

    try {
        const measurements = measure(ref);

        sharedValues.x.value = measurements?.pageX || 999999;
        sharedValues.y.value = measurements?.pageY || 999999;
        sharedValues.width.value = measurements?.width || 0;
        sharedValues.height.value = measurements?.height || 0;
    } catch (err) {
        sharedValues.x.value = 999999;
        sharedValues.y.value = 999999;
        sharedValues.width.value = 0;
        sharedValues.height.value = 0;
    }
}

export function measureViewInWindow(ref: RefObject<View | null>): Promise<{x: number; y: number; width: number; height: number}> {
    return new Promise((resolve) => {
        if (ref.current) {
            ref.current.measure((x, y, width, height, pageX, pageY) => {
                resolve({
                    x: pageX,
                    y: pageY,
                    width,
                    height,
                });
            });
        } else {
            resolve({
                x: 0,
                y: 0,
                width: 0,
                height: 0,
            });
        }
    });
}

export function openGalleryAtIndex(galleryIdentifier: string, initialIndex: number, items: GalleryItemType[], hideActions = false) {
    // Check if the file at initialIndex is rejected by plugin
    const initialItem = items[initialIndex];
    if (initialItem?.id && EphemeralStore.isFileRejected(initialItem.id)) {
        // Show error snackbar with the plugin's rejection reason
        const rejectionReason = EphemeralStore.getRejectionReason(initialItem.id);
        showSnackBar({
            barType: SNACK_BAR_TYPE.FILE_DOWNLOAD_REJECTED,
            customMessage: rejectionReason || undefined,
            type: 'error',
        });
        return;
    }

    Keyboard.dismiss();
    const props = {
        galleryIdentifier,
        hideActions,
        initialIndex,
        items,
    };

    navigateToScreen(Screens.GALLERY, props);
}

export const typedMemo: <T>(c: T) => T = React.memo;

export const getImageSize = async (serverUrl: string, uri: string, cacheKey: string) => {
    const image = await Image.loadAsync({uri, cacheKey, cachePath: urlSafeBase64Encode(serverUrl)});
    return {width: image.width, height: image.height};
};