/** @format */
/**
 * External dependencies
 */
import { __ } from '@wordpress/i18n';
import { Component, Fragment } from '@wordpress/element';
import { compose } from '@wordpress/compose';
import { withSelect } from '@wordpress/data';
import { map, isEqual } from 'lodash';

/**
 * Internal dependencies
 */
import {
	ReportFilters,
	SummaryList,
	SummaryListPlaceholder,
	SummaryNumber,
} from '@woocommerce/components';
import { filters, advancedFilterConfig } from './config';
import { formatCurrency } from 'lib/currency';
import { getNewPath } from 'lib/nav-utils';
import { getReportChartData } from 'store/reports/utils';
import { getCurrentDates, getDateParamsFromQuery, getIntervalForQuery } from 'lib/date';
import { MAX_PER_PAGE } from 'store/constants';
import OrdersReportTable from './table';

class OrdersReport extends Component {
	constructor( props ) {
		super( props );

		this.state = {
			primaryTotals: null,
			secondaryTotals: null,
		};
	}

	// Track primary and secondary 'totals' indepdent of query.
	// We don't want each little query update (interval, sorting, etc)
	componentDidUpdate( prevProps ) {
		/* eslint-disable react/no-did-update-set-state */

		if ( ! isEqual( prevProps.dates, this.props.dates ) ) {
			this.setState( {
				primaryTotals: null,
				secondaryTotals: null,
			} );
		}

		const { secondaryData, primaryData } = this.props;
		if ( ! isEqual( prevProps.secondaryData, secondaryData ) ) {
			if ( secondaryData && secondaryData.data && secondaryData.data.totals ) {
				this.setState( { secondaryTotals: secondaryData.data.totals } );
			}
		}

		if ( ! isEqual( prevProps.primaryData, primaryData ) ) {
			if ( primaryData && primaryData.data && primaryData.data.totals ) {
				this.setState( { primaryTotals: primaryData.data.totals } );
			}
		}
		/* eslint-enable react/no-did-update-set-state */
	}

	getCharts() {
		return [
			{
				key: 'net_revenue',
				label: __( 'Net Revenue', 'wc-admin' ),
				type: 'currency',
			},
			{
				key: 'avg_order_value',
				label: __( 'Avergae Order Value', 'wc-admin' ),
				type: 'currency',
			},
			{
				key: 'avg_items_per_order',
				label: __( 'Average Items Per Order', 'wc-admin' ),
				type: 'number',
			},
			{
				key: 'orders_count',
				label: __( 'Orders Count', 'wc-admin' ),
				type: 'number',
			},
		];
	}

	getSelectedChart() {
		const { query } = this.props;
		const charts = this.getCharts();

		const chart = find( charts, { key: query.chart } );
		if ( chart ) {
			return chart;
		}

		return charts[ 0 ];
	}

	renderChartSummaryNumbers() {
		const selectedChart = this.getSelectedChart();
		const charts = this.getCharts();
		if ( ! this.state.primaryTotals || ! this.state.secondaryTotals ) {
			return <SummaryListPlaceholder numberOfItems={ charts.length } />;
		}

		const totals = this.state.primaryTotals || {};
		const secondaryTotals = this.state.secondaryTotals || {};
		const { compare } = getDateParamsFromQuery( this.props.query );

		const summaryNumbers = map( this.getCharts(), chart => {
			const { key, label, type } = chart;
			const isSelected = selectedChart.key === key;

			let value = parseFloat( totals[ key ] );
			let secondaryValue =
				( secondaryTotals[ key ] && parseFloat( secondaryTotals[ key ] ) ) || undefined;

			let delta = 0;
			if ( secondaryValue && secondaryValue !== 0 ) {
				delta = Math.round( ( value - secondaryValue ) / secondaryValue * 100 );
			}

			switch ( type ) {
				case 'currency':
					value = formatCurrency( value );
					secondaryValue = secondaryValue && formatCurrency( secondaryValue );
					break;
				case 'number':
					value = value;
					secondaryValue = secondaryValue;
					break;
			}

			const href = getNewPath( { chart: key } );

			return (
				<SummaryNumber
					key={ key }
					value={ value }
					label={ label }
					selected={ isSelected }
					prevValue={ secondaryValue }
					prevLabel={
						'previous_period' === compare
							? __( 'Previous Period:', 'wc-admin' )
							: __( 'Previous Year:', 'wc-admin' )
					}
					delta={ delta }
					href={ href }
				/>
			);
		} );

		return <SummaryList>{ summaryNumbers }</SummaryList>;
	}

	render() {
		const { isRequesting, orders, path, query } = this.props;

		return (
			<Fragment>
				<ReportFilters
					query={ query }
					path={ path }
					filters={ filters }
					advancedConfig={ advancedFilterConfig }
				/>
				{ this.renderChartSummaryNumbers() }
				<OrdersReportTable isRequesting={ isRequesting } orders={ orders } query={ query } />
			</Fragment>
		);
	}
}

export default compose(
	withSelect( ( select, props ) => {
		const { getOrders } = select( 'wc-admin' );
		const orders = getOrders();
		const isRequesting = select( 'core/data' ).isResolving( 'wc-admin', 'getOrders' );
		const { query } = props;
		const interval = getIntervalForQuery( query );
		const datesFromQuery = getCurrentDates( query );
		const baseArgs = {
			order: 'asc',
			interval: interval,
			per_page: MAX_PER_PAGE,
		};

		const primaryData = getReportChartData(
			'orders',
			{
				...baseArgs,
				after: datesFromQuery.primary.after,
				before: datesFromQuery.primary.before,
			},
			select
		);

		const secondaryData = getReportChartData(
			'orders',
			{
				...baseArgs,
				after: datesFromQuery.secondary.after,
				before: datesFromQuery.secondary.before,
			},
			select
		);
		return {
			isRequesting,
			orders,
			primaryData,
			secondaryData,
		};
	} )
)( OrdersReport );