RocketChat/Rocket.Chat

import type { LayoutBlockType } from '../LayoutBlockType';
import type { LayoutBlockish } from '../LayoutBlockish';
import type { TextObject } from '../TextObject';
import type { ContextBlock } from './ContextBlock';

type Image = {
    url: string;
    dimensions?: {
        width: number;
        height: number;
    };
};

export type PreviewBlockBase = LayoutBlockish<{
    type: `${LayoutBlockType.PREVIEW}`;
    title: TextObject[];
    description: TextObject[];
    footer?: ContextBlock;
}>;

export type PreviewBlockWithThumb = PreviewBlockBase & {
    thumb: Image;
};

export type PreviewBlockWithPreview = PreviewBlockBase & {
    preview: Image;
    externalUrl?: string;
    oembedUrl?: string;
    thumb: undefined;
};

export type PreviewBlock = PreviewBlockBase | PreviewBlockWithThumb | PreviewBlockWithPreview;

export const isPreviewBlockWithThumb = (previewBlock: PreviewBlock): previewBlock is PreviewBlockWithThumb => 'thumb' in previewBlock;

export const isPreviewBlockWithPreview = (previewBlock: PreviewBlock): previewBlock is PreviewBlockWithPreview =>
    'externalUrl' in previewBlock || 'oembedUrl' in previewBlock;