/** @format */
/**
 * External dependencies
 */
import { __, sprintf } from '@wordpress/i18n';
import { Component, createRef, Fragment } from '@wordpress/element';
import classnames from 'classnames';
import { IconButton } from '@wordpress/components';
import { find, get, noop } from 'lodash';
import Gridicon from 'gridicons';
import PropTypes from 'prop-types';
import { withInstanceId } from '@wordpress/compose';

const ASC = 'asc';
const DESC = 'desc';

const getDisplay = cell => cell.display || null;

/**
 * A table component, without the Card wrapper. This is a basic table display, sortable, but no default filtering.
 *
 * Row data should be passed to the component as a list of arrays, where each array is a row in the table.
 * Headers are passed in separately as an array of objects with column-related properties. For example,
 * this data would render the following table.
 *
 * ```js
 * const headers = [ { label: 'Month' }, { label: 'Orders' }, { label: 'Revenue' } ];
 * const rows = [
 * 	[
 * 		{ display: 'January', value: 1 },
 * 		{ display: 10, value: 10 },
 * 		{ display: '$530.00', value: 530 },
 * 	],
 * 	[
 * 		{ display: 'February', value: 2 },
 * 		{ display: 13, value: 13 },
 * 		{ display: '$675.00', value: 675 },
 * 	],
 * 	[
 * 		{ display: 'March', value: 3 },
 * 		{ display: 9, value: 9 },
 * 		{ display: '$460.00', value: 460 },
 * 	],
 * ]
 * ```
 *
 * |   Month  | Orders | Revenue |
 * | ---------|--------|---------|
 * | January  |     10 | $530.00 |
 * | February |     13 | $675.00 |
 * | March    |      9 | $460.00 |
 */
class Table extends Component {
	constructor( props ) {
		super( props );
		this.state = {
			tabIndex: null,
			isScrollable: false,
		};
		this.container = createRef();
		this.sortBy = this.sortBy.bind( this );
	}

	componentDidMount() {
		const { scrollWidth, clientWidth } = this.container.current;
		const scrollable = scrollWidth > clientWidth;
		/* eslint-disable react/no-did-mount-set-state */
		this.setState( {
			tabIndex: scrollable ? '0' : null,
		} );
		/* eslint-enable react/no-did-mount-set-state */
		this.updateTableShadow();
		window.addEventListener( 'resize', this.updateTableShadow );
	}

	componentWillUnmount() {
		window.removeEventListener( 'resize', this.updateTableShadow );
	}

	sortBy( key ) {
		const { headers, query } = this.props;
		return () => {
			const currentKey =
				query.orderby || get( find( headers, { defaultSort: true } ), 'key', false );
			const currentDir = query.order || DESC;
			let dir = DESC;
			if ( key === currentKey ) {
				dir = DESC === currentDir ? ASC : DESC;
			}
			this.props.onSort( key, dir );
		};
	}

	updateTableShadow = () => {
		const table = this.container.current;
		const scrolledToEnd = table.scrollWidth - table.scrollLeft <= table.offsetWidth;
		this.setState( {
			isScrollable: scrolledToEnd ? false : true,
		} );
	};

	render() {
		const {
			ariaHidden,
			caption,
			classNames,
			headers,
			instanceId,
			query,
			rowHeader,
			rows,
		} = this.props;
		const { tabIndex } = this.state;
		const classes = classnames( 'woocommerce-table__table', classNames, {
			'is-scrollable': this.state.isScrollable,
		} );
		const sortedBy = query.orderby || get( find( headers, { defaultSort: true } ), 'key', false );
		const sortDir = query.order || DESC;

		return (
			<div
				className={ classes }
				ref={ this.container }
				tabIndex={ tabIndex }
				aria-hidden={ ariaHidden }
				aria-labelledby={ `caption-${ instanceId }` }
				role="group"
				onScroll={ this.updateTableShadow }
			>
				<table>
					<caption
						id={ `caption-${ instanceId }` }
						className="woocommerce-table__caption screen-reader-text"
					>
						{ caption }
						{ tabIndex === '0' && <small>{ __( '(scroll to see more)', 'wc-admin' ) }</small> }
					</caption>
					<tbody>
						<tr>
							{ headers.map( ( header, i ) => {
								const { cellClassName, isLeftAligned, isSortable, isNumeric, key, label } = header;
								const labelId = `header-${ instanceId } -${ i }`;
								const thProps = {
									className: classnames( 'woocommerce-table__header', cellClassName, {
										'is-left-aligned': isLeftAligned,
										'is-sortable': isSortable,
										'is-sorted': sortedBy === key,
										'is-numeric': isNumeric,
									} ),
								};
								if ( isSortable ) {
									thProps[ 'aria-sort' ] = 'none';
									if ( sortedBy === key ) {
										thProps[ 'aria-sort' ] = sortDir === ASC ? 'ascending' : 'descending';
									}
								}
								// We only sort by ascending if the col is already sorted descending
								const iconLabel =
									sortedBy === key && sortDir !== ASC
										? sprintf( __( 'Sort by %s in ascending order', 'wc-admin' ), label )
										: sprintf( __( 'Sort by %s in descending order', 'wc-admin' ), label );

								return (
									<th role="columnheader" scope="col" key={ i } { ...thProps }>
										{ isSortable ? (
											<Fragment>
												<IconButton
													icon={
														sortedBy === key && sortDir === ASC ? (
															<Gridicon size={ 18 } icon="chevron-up" />
														) : (
															<Gridicon size={ 18 } icon="chevron-down" />
														)
													}
													aria-describedby={ labelId }
													onClick={ this.sortBy( key ) }
													isDefault
												>
													{ label }
												</IconButton>
												<span className="screen-reader-text" id={ labelId }>
													{ iconLabel }
												</span>
											</Fragment>
										) : (
											label
										) }
									</th>
								);
							} ) }
						</tr>
						{ rows.map( ( row, i ) => (
							<tr key={ i }>
								{ row.map( ( cell, j ) => {
									const { cellClassName, isLeftAligned, isNumeric } = headers[ j ];
									const isHeader = rowHeader === j;
									const Cell = isHeader ? 'th' : 'td';
									const cellClasses = classnames( 'woocommerce-table__item', cellClassName, {
										'is-left-aligned': isLeftAligned,
										'is-numeric': isNumeric,
										'is-sorted': sortedBy === headers[ j ].key,
									} );
									return (
										<Cell scope={ isHeader ? 'row' : null } key={ j } className={ cellClasses }>
											{ getDisplay( cell ) }
										</Cell>
									);
								} ) }
							</tr>
						) ) }
					</tbody>
				</table>
			</div>
		);
	}
}

Table.propTypes = {
	/**
	 * Controls whether this component is hidden from screen readers. Used by the loading state, before there is data to read.
	 * Don't use this on real tables unless the table data is loaded elsewhere on the page.
	 */
	ariaHidden: PropTypes.bool,
	/**
	 * A label for the content in this table
	 */
	caption: PropTypes.string.isRequired,
	/**
	 * Additional CSS classes.
	 */
	className: PropTypes.string,
	/**
	 * An array of column headers, as objects.
	 */
	headers: PropTypes.arrayOf(
		PropTypes.shape( {
			/**
			 * Boolean, true if this column is the default for sorting. Only one column should have this set.
			 */
			defaultSort: PropTypes.bool,
			/**
			 * Boolean, true if this column should be aligned to the left.
			 */
			isLeftAligned: PropTypes.bool,
			/**
			 * Boolean, true if this column is a number value.
			 */
			isNumeric: PropTypes.bool,
			/**
			 * Boolean, true if this column is sortable.
			 */
			isSortable: PropTypes.bool,
			/**
			 * The API parameter name for this column, passed to `orderby` when sorting via API.
			 */
			key: PropTypes.string,
			/**
			 * The display label for this column.
			 */
			label: PropTypes.node,
			/**
			 * Boolean, true if this column should always display in the table (not shown in toggle-able list).
			 */
			required: PropTypes.bool,
		} )
	),
	/**
	 * A function called when sortable table headers are clicked, gets the `header.key` as argument.
	 */
	onSort: PropTypes.func,
	/**
	 * The query string represented in object form
	 */
	query: PropTypes.object,
	/**
	 * An array of arrays of display/value object pairs.
	 */
	rows: PropTypes.arrayOf(
		PropTypes.arrayOf(
			PropTypes.shape( {
				/**
				 * Display value, used for rendering- strings or elements are best here.
				 */
				display: PropTypes.node,
				/**
				 * "Real" value used for sorting, and should be a string or number. A column with `false` value will not be sortable.
				 */
				value: PropTypes.oneOfType( [ PropTypes.string, PropTypes.number, PropTypes.bool ] ),
			} )
		)
	).isRequired,
	/**
	 * Which column should be the row header, defaults to the first item (`0`) (but could be set to `1`, if the first col
	 * is checkboxes, for example). Set to false to disable row headers.
	 */
	rowHeader: PropTypes.oneOfType( [ PropTypes.number, PropTypes.bool ] ),
};

Table.defaultProps = {
	ariaHidden: false,
	headers: [],
	onSort: noop,
	query: {},
	rowHeader: 0,
};

export default withInstanceId( Table );