// @ts-ignore
import { useEntityProp } from '@wordpress/core-data';
import { useRef } from '@wordpress/element';
import { __ } from '@wordpress/i18n';
import { closeSmall } from '@wordpress/icons';
import {
	Button,
	DateTimePicker,
	Dropdown,
	PanelRow,
	__experimentalHStack as HStack,
	__experimentalHeading as Heading,
	__experimentalSpacer as Spacer,
} from '@wordpress/components';
import { dateI18n, getSettings } from '@wordpress/date';
// @ts-ignore
import moment from 'moment';

const TIMEZONELESS_FORMAT = 'YYYY-MM-DDTHH:mm:ss';

interface DatetimeControlProps {
	label: string;
	term: string;
	taxonomy: string;
	postType: string;
	type: 'attach' | 'detach';
}

interface ScheduleTermsMeta {
	type: 'attach' | 'detach';
	datetime: string;
	term: string;
	taxonomy: string;
}

interface PostMeta {
	[ key: string ]: any;

	schedule_terms: ScheduleTermsMeta[];
}

export const DatetimeControl = ( {
	term,
	taxonomy,
	label,
	postType,
	type,
}: DatetimeControlProps ) => {
	// @ts-ignore
	const [ meta, setMeta ]: [ PostMeta, ( meta: PostMeta ) => void ] =
		useEntityProp( 'postType', postType, 'meta' );
	const anchorRef = useRef();
	const dateSettings = getSettings();

	// @ts-ignore
	const [ siteFormat = dateSettings?.formats.date ] = useEntityProp(
		'root',
		'site',
		'date_format'
	);
	// @ts-ignore
	const [ siteTimeFormat = dateSettings?.formats.time ] = useEntityProp(
		'root',
		'site',
		'time_format'
	);

	const is12HourTime = /a(?!\\)/i.test(
		siteTimeFormat
			.toLowerCase() // Test only the lower case a.
			.replace( /\\\\/g, '' ) // Replace "//" with empty strings.
			.split( '' )
			.reverse()
			.join( '' ) // Reverse the string and test for "a" not followed by a slash.
	);

	const getTimezoneOffsetString = () => {
		// @ts-ignore
		const { timezone } = dateSettings;
		const [ hour, time ] = timezone.offset.toString().split( '.' );
		return `${ Number( hour ) > 0 ? '+' : '-' }${ String(
			Math.abs( Number( hour ) )
		).padStart( 2, '0' ) }:${ String(
			Math.floor( Number( `0.${ time || 0 }` ) * 60 )
		).padStart( 2, '0' ) }`;
	};

	const updateDatetime = ( datetime: string | null ) => {
		const otherItems =
			meta?.schedule_terms?.filter( ( item ) => {
				return ! (
					item.term === term &&
					item.type === type &&
					item.taxonomy === taxonomy
				);
			} ) || [];
		setMeta( {
			...meta,
			schedule_terms: [
				...otherItems,
				datetime
					? {
							term,
							taxonomy,
							type,
							// convert to UTC.
							datetime: moment(
								`${ datetime }${ getTimezoneOffsetString() }`
							)
								.utc()
								.format(),
					  }
					: null,
			].filter( ( e ): e is ScheduleTermsMeta => e !== null ),
		} );
	};

	const getDatetime = ( format = TIMEZONELESS_FORMAT ) => {
		const val = meta?.schedule_terms?.find( ( item ) => {
			return (
				item.term === term &&
				item.type === type &&
				item.taxonomy === taxonomy
			);
		} );

		if ( val?.datetime ) {
			return moment( val.datetime )
				.utcOffset( getTimezoneOffsetString() )
				.format( format );
		}

		return undefined;
	};

	const datetime = getDatetime();

	return (
		// @ts-ignore
		<PanelRow ref={ anchorRef }>
			<span>{ label }</span>
			<Dropdown
				// @ts-ignore
				popoverProps={ { anchorRef: anchorRef.current } }
				renderToggle={ ( { onToggle, isOpen } ) => (
					<>
						<Button
							onClick={ onToggle }
							aria-expanded={ isOpen }
							variant="tertiary"
						>
							{ datetime
								? // @ts-ignore
								  dateI18n(
										`${ siteFormat } ${ siteTimeFormat }`,
										datetime
								  )
								: __( 'none', 'schedule-terms' ) }
						</Button>
					</>
				) }
				renderContent={ ( { onClose } ) => (
					<div style={ { padding: 8 } }>
						<div style={ { marginBottom: '1em' } }>
							<HStack>
								{ /* @ts-ignore */ }
								<Heading level={ 2 } size={ 13 }>
									{ label }
								</Heading>
								<Spacer />
								<Button
									className="block-editor-inspector-popover-header__action"
									label={ __( 'Close' ) }
									icon={ closeSmall }
									onClick={ onClose }
								/>
							</HStack>
						</div>

						<DateTimePicker
							is12Hour={ is12HourTime }
							currentDate={ datetime }
							onChange={ ( newDate ) =>
								updateDatetime( newDate )
							}
						/>
						<div style={ { marginTop: '1em' } }>
							<Button
								variant="secondary"
								onClick={ () => updateDatetime( null ) }
							>
								{ __( 'Reset', 'schedule-terms' ) }
							</Button>
						</div>
					</div>
				) }
			/>
		</PanelRow>
	);
};