import {
	Button,
	DropZone,
	FlexBlock,
	Spinner,
	__experimentalItemGroup as ItemGroup,
	__experimentalHStack as HStack,
	__experimentalTruncate as Truncate,
} from '@wordpress/components';
import {
	MediaReplaceFlow,
	store as blockEditorStore,
} from '@wordpress/block-editor';
import { focus } from '@wordpress/dom';
import { useRef } from '@wordpress/element';
import { __ } from '@wordpress/i18n';
import { useSelect } from '@wordpress/data';
import { reset as resetIcon } from '@wordpress/icons';
import { getFilename } from '@wordpress/url';

/**
 * Focuses the toggle button.
 *
 * @param {Object} containerRef - ref object containing current element
 */
const focusToggleButton = ( containerRef ) => {
	// Use requestAnimationFrame to ensure DOM updates are complete.
	window.requestAnimationFrame( () => {
		const [ toggleButton ] = focus.tabbable.find( containerRef?.current );
		if ( ! toggleButton ) {
			return;
		}

		toggleButton.focus();
	} );
};

/**
 * MediaControlPreview - Preview component showing media thumbnail and filename
 *
 * @param {Object} props
 * @param {string} props.url            Media URL for thumbnail
 * @param {string} props.filename       Filename to display
 * @param {Object} props.itemGroupProps Optional props to pass to ItemGroup
 * @param {string} props.className      Optional className for Truncate
 * @param {string} props.label          Optional label for accessibility
 * @return {Element} Preview component
 */
export function MediaControlPreview( {
	url,
	filename,
	itemGroupProps,
	className,
	label,
} ) {
	return (
		<ItemGroup { ...itemGroupProps } as="span">
			<HStack justify="flex-start">
				<span
					className="block-library-utils__media-control__inspector-image-indicator"
					style={ {
						backgroundImage: url ? `url(${ url })` : undefined,
					} }
				/>
				<FlexBlock>
					<Truncate numberOfLines={ 1 } className={ className }>
						{ filename ?? label }
					</Truncate>
				</FlexBlock>
			</HStack>
		</ItemGroup>
	);
}

/**
 * MediaControl - Complete media selection control for inspector panels
 *
 * @param {Object}   props
 * @param {number}   props.mediaId      Media attachment ID
 * @param {string}   props.mediaUrl     Media URL
 * @param {string}   props.filename     Filename to display
 * @param {Array}    props.allowedTypes Allowed media types
 * @param {Function} props.onSelect     Callback when media selected
 * @param {Function} props.onSelectURL  Callback when URL entered
 * @param {Function} props.onError      Error callback
 * @param {Function} props.onReset      Reset/remove callback
 * @param {boolean}  props.isUploading  Whether upload in progress
 * @param {string}   props.emptyLabel   Label when no media (default: 'Add media')
 * @return {Element} Media control component
 */
export function MediaControl( {
	mediaId,
	mediaUrl,
	filename,
	allowedTypes,
	onSelect,
	onSelectURL,
	onError,
	onReset,
	isUploading = false,
	emptyLabel = __( 'Media' ),
} ) {
	const { getSettings } = useSelect( blockEditorStore );
	const onFilesDrop = ( filesList ) => {
		const { mediaUpload } = getSettings();
		if ( ! mediaUpload ) {
			return;
		}
		mediaUpload( {
			allowedTypes,
			filesList,
			onFileChange( [ media ] ) {
				onSelect( media );
			},
			onError,
			multiple: false,
		} );
	};
	const containerRef = useRef();

	return (
		<div
			ref={ containerRef }
			className="block-library-utils__media-control"
		>
			<MediaReplaceFlow
				className="block-library-utils__media-control__replace-flow"
				mediaId={ mediaId }
				mediaURL={ mediaUrl }
				allowedTypes={ allowedTypes }
				onSelect={ onSelect }
				onSelectURL={ onSelectURL }
				onError={ onError }
				name={
					<MediaControlPreview
						url={ mediaUrl }
						filename={ filename }
						className="block-library-utils__media-control__inspector-media-replace-title"
						label={
							mediaUrl
								? getFilename( filename ) || emptyLabel
								: emptyLabel
						}
					/>
				}
				renderToggle={ ( props ) => (
					<Button { ...props } __next40pxDefaultSize>
						{ isUploading ? <Spinner /> : props.children }
					</Button>
				) }
				onReset={ onReset }
			/>
			{ mediaUrl && onReset && (
				<Button
					label={ __( 'Reset' ) }
					className="block-library-utils__media-control__reset"
					size="small"
					icon={ resetIcon }
					onClick={ () => {
						onReset();
						focusToggleButton( containerRef );
					} }
				/>
			) }
			<DropZone onFilesDrop={ onFilesDrop } />
		</div>
	);
}