import {
	createBlock,
	hasBlockSupport,
	store as blocksStore,
} from '@wordpress/blocks';
import {
	addSubmenu,
	chevronUp,
	chevronDown,
	moreVertical,
} from '@wordpress/icons';
import { DropdownMenu, MenuItem, MenuGroup } from '@wordpress/components';
import { useDispatch, useSelect } from '@wordpress/data';
import { __, sprintf } from '@wordpress/i18n';
import { BlockTitle, store as blockEditorStore } from '@wordpress/block-editor';
import { DEFAULT_BLOCK } from '../constants';

const POPOVER_PROPS = {
	className: 'block-editor-block-settings-menu__popover',
	placement: 'bottom-start',
};

const BLOCKS_THAT_CAN_BE_CONVERTED_TO_SUBMENU = [
	'core/navigation-link',
	'core/navigation-submenu',
];

function AddSubmenuItem( {
	clientId,
	onClose,
	isDisabled,
	updateExpansion,
	setInsertedBlockClientId,
} ) {
	const { insertBlock, replaceBlock, replaceInnerBlocks } =
		useDispatch( blockEditorStore );
	const { getBlock } = useSelect( blockEditorStore );

	return (
		<MenuItem
			icon={ addSubmenu }
			disabled={ isDisabled }
			onClick={ () => {
				const updateSelectionOnInsert = false;
				const newLink = createBlock(
					DEFAULT_BLOCK.name,
					DEFAULT_BLOCK.attributes
				);
				const block = getBlock( clientId );

				if ( block.name === 'core/navigation-submenu' ) {
					insertBlock(
						newLink,
						block.innerBlocks.length,
						clientId,
						updateSelectionOnInsert
					);
				} else {
					// Convert to a submenu if the block currently isn't one.
					const newSubmenu = createBlock(
						'core/navigation-submenu',
						block.attributes,
						block.innerBlocks
					);

					// The following must happen as two independent actions.
					// Why? Because the offcanvas editor relies on the getLastInsertedBlocksClientIds
					// selector to determine which block is "active". As the UX needs the newLink to be
					// the "active" block it must be the last block to be inserted.
					// Therefore the Submenu is first created and **then** the newLink is inserted
					// thus ensuring it is the last inserted block.
					replaceBlock( clientId, newSubmenu );

					replaceInnerBlocks(
						newSubmenu.clientId,
						[ newLink ],
						updateSelectionOnInsert
					);
				}

				// This call sets the local List View state for the "last inserted block".
				// This is required for the Nav Block to determine whether or not to display
				// the Link UI for this new block.
				setInsertedBlockClientId( newLink.clientId );
				updateExpansion( { type: 'expand', clientIds: [ clientId ] } );
				onClose();
			} }
		>
			{ __( 'Add submenu link' ) }
		</MenuItem>
	);
}

export default function LeafMoreMenu( {
	clientId,
	updateExpansion,
	setInsertedBlockClientId,
	...props
} ) {
	const {
		moveBlocksDown,
		moveBlocksUp,
		removeBlocks,
		duplicateBlocks,
		insertBeforeBlock,
		insertAfterBlock,
	} = useDispatch( blockEditorStore );

	const removeLabel = sprintf(
		/* translators: %s: block name */
		__( 'Remove %s' ),
		BlockTitle( { clientId, maximumLength: 25 } )
	);

	const {
		blockName,
		rootClientId,
		canDuplicate,
		canInsertBlock,
		isFirst,
		isLast,
	} = useSelect(
		( select ) => {
			const {
				getBlockRootClientId,
				getBlockName,
				canInsertBlockType,
				getDirectInsertBlock,
				getBlockIndex,
				getBlockCount,
			} = select( blockEditorStore );
			const { getDefaultBlockName } = select( blocksStore );

			const _rootClientId = getBlockRootClientId( clientId );
			const _blockName = getBlockName( clientId );
			const canInsertDefaultBlock = canInsertBlockType(
				getDefaultBlockName(),
				_rootClientId
			);
			const directInsertBlock = _rootClientId
				? getDirectInsertBlock( _rootClientId )
				: null;

			return {
				blockName: _blockName,
				rootClientId: _rootClientId,
				canDuplicate:
					!! _blockName &&
					hasBlockSupport( _blockName, 'multiple', true ) &&
					canInsertBlockType( _blockName, _rootClientId ),
				canInsertBlock:
					( canInsertDefaultBlock || !! directInsertBlock ) &&
					!! _blockName &&
					canInsertBlockType( _blockName, _rootClientId ),
				isFirst: getBlockIndex( clientId ) === 0,
				isLast:
					getBlockIndex( clientId ) ===
					getBlockCount( _rootClientId ) - 1,
			};
		},
		[ clientId ]
	);

	const isSubmenuDisabled =
		! BLOCKS_THAT_CAN_BE_CONVERTED_TO_SUBMENU.includes( blockName );

	return (
		<DropdownMenu
			icon={ moreVertical }
			label={ __( 'Options' ) }
			className="block-editor-block-settings-menu"
			popoverProps={ POPOVER_PROPS }
			noIcons
			{ ...props }
		>
			{ ( { onClose } ) => (
				<>
					<MenuGroup>
						<MenuItem
							icon={ chevronUp }
							disabled={ isFirst }
							accessibleWhenDisabled
							onClick={ () => {
								moveBlocksUp( [ clientId ], rootClientId );
								onClose();
							} }
						>
							{ __( 'Move up' ) }
						</MenuItem>
						<MenuItem
							icon={ chevronDown }
							disabled={ isLast }
							accessibleWhenDisabled
							onClick={ () => {
								moveBlocksDown( [ clientId ], rootClientId );
								onClose();
							} }
						>
							{ __( 'Move down' ) }
						</MenuItem>
						<AddSubmenuItem
							clientId={ clientId }
							onClose={ onClose }
							isDisabled={ isSubmenuDisabled }
							updateExpansion={ updateExpansion }
							setInsertedBlockClientId={
								setInsertedBlockClientId
							}
						/>
						{ canDuplicate && (
							<MenuItem
								onClick={ () => {
									duplicateBlocks( [ clientId ] );
									onClose();
								} }
							>
								{ __( 'Duplicate' ) }
							</MenuItem>
						) }
						{ canInsertBlock && (
							<>
								<MenuItem
									onClick={ () => {
										insertBeforeBlock( clientId );
										onClose();
									} }
								>
									{ __( 'Add before' ) }
								</MenuItem>
								<MenuItem
									onClick={ () => {
										insertAfterBlock( clientId );
										onClose();
									} }
								>
									{ __( 'Add after' ) }
								</MenuItem>
							</>
						) }
					</MenuGroup>
					<MenuGroup>
						<MenuItem
							onClick={ () => {
								removeBlocks( [ clientId ], false );
								onClose();
							} }
						>
							{ removeLabel }
						</MenuItem>
					</MenuGroup>
				</>
			) }
		</DropdownMenu>
	);
}