import BaseElements from './require/base-elements.js';

import { Channel, ShouldNeverHappenError } from '../data-types';
import CombinedGuild from '../guild-combined.js';

export default function createUploadOverlayFromDataTransferItem(document: Document, guild: CombinedGuild, channel: Channel, dataTransferItem: DataTransferItem): HTMLElement {
	let file = dataTransferItem.getAsFile();
	if (file === null) throw new ShouldNeverHappenError('no file in the data transfer item');
	let element = BaseElements.createUploadOverlay(document, {
		guild: guild, channel: channel, resourceName: file.name,
		resourceBuffFunc: async () => {
			if (file === null) throw new ShouldNeverHappenError('no file in the data transfer item');
			return Buffer.from(await file.arrayBuffer());
		},
		resourceSizeFunc: () => {
			if (file === null) throw new ShouldNeverHappenError('no file in the data transfer item');
			return file.size;
		}
	});
	return element;
}