import { __ } from '@wordpress/i18n';
import { InspectorControls, useBlockProps } from '@wordpress/block-editor';
import {
	__experimentalToolsPanel as ToolsPanel,
	__experimentalToolsPanelItem as ToolsPanelItem,
	RangeControl,
} from '@wordpress/components';
import { useToolsPanelDropdownMenuProps } from '../utils/hooks';

const createPaginationItem = ( content, Tag = 'a', extraClass = '' ) => (
	<Tag key={ content } className={ `page-numbers ${ extraClass }` }>
		{ content }
	</Tag>
);

const previewPaginationNumbers = ( midSize ) => {
	const paginationItems = [];

	// First set of pagination items.
	for ( let i = 1; i <= midSize; i++ ) {
		paginationItems.push( createPaginationItem( i ) );
	}

	// Current pagination item.
	paginationItems.push(
		createPaginationItem( midSize + 1, 'span', 'current' )
	);

	// Second set of pagination items.
	for ( let i = 1; i <= midSize; i++ ) {
		paginationItems.push( createPaginationItem( midSize + 1 + i ) );
	}

	// Dots.
	paginationItems.push( createPaginationItem( '...', 'span', 'dots' ) );

	// Last pagination item.
	paginationItems.push( createPaginationItem( midSize * 2 + 3 ) );

	return <>{ paginationItems }</>;
};

export default function QueryPaginationNumbersEdit( {
	attributes,
	setAttributes,
} ) {
	const { midSize } = attributes;
	const paginationNumbers = previewPaginationNumbers(
		parseInt( midSize, 10 )
	);
	const dropdownMenuProps = useToolsPanelDropdownMenuProps();

	return (
		<>
			<InspectorControls>
				<ToolsPanel
					label={ __( 'Settings' ) }
					resetAll={ () => setAttributes( { midSize: 2 } ) }
					dropdownMenuProps={ dropdownMenuProps }
				>
					<ToolsPanelItem
						label={ __( 'Number of links' ) }
						hasValue={ () => midSize !== 2 }
						onDeselect={ () => setAttributes( { midSize: 2 } ) }
						isShownByDefault
					>
						<RangeControl
							label={ __( 'Number of links' ) }
							help={ __(
								'Specify how many links can appear before and after the current page number. Links to the first, current and last page are always visible.'
							) }
							value={ midSize }
							onChange={ ( value ) => {
								setAttributes( {
									midSize: parseInt( value, 10 ),
								} );
							} }
							min={ 0 }
							max={ 5 }
							withInputField={ false }
						/>
					</ToolsPanelItem>
				</ToolsPanel>
			</InspectorControls>
			<div { ...useBlockProps() }>{ paginationNumbers }</div>
		</>
	);
}