/**
 * External dependencies
 */
import { Component, Suspense, lazy } from '@wordpress/element';
import { parse, stringify } from 'qs';
import { find, isEqual, last, omit } from 'lodash';
import { applyFilters } from '@wordpress/hooks';
import { __ } from '@wordpress/i18n';

/**
 * WooCommerce dependencies
 */
import {
	getNewPath,
	getPersistedQuery,
	getHistory,
} from '@woocommerce/navigation';
import { Spinner } from '@woocommerce/components';

/**
 * Internal dependencies
 */
import { getUrlParams } from 'utils';

const AnalyticsReport = lazy( () =>
	import( /* webpackChunkName: "analytics-report" */ 'analytics/report' )
);
const AnalyticsSettings = lazy( () =>
	import( /* webpackChunkName: "analytics-settings" */ 'analytics/settings' )
);
const Dashboard = lazy( () =>
	import( /* webpackChunkName: "dashboard" */ 'dashboard' )
);
const DevDocs = lazy( () =>
	import( /* webpackChunkName: "devdocs" */ 'devdocs' )
);
const Homescreen = lazy( () =>
	import( /* webpackChunkName: "homescreen" */ 'homescreen' )
);
const MarketingOverview = lazy( () =>
	import( /* webpackChunkName: "marketing-overview" */ 'marketing/overview' )
);
import getReports from 'analytics/report/get-reports';

const TIME_EXCLUDED_SCREENS_FILTER = 'woocommerce_admin_time_excluded_screens';

export const PAGES_FILTER = 'woocommerce_admin_pages_list';

export const getPages = () => {
	const pages = [];
	const initialBreadcrumbs = [ [ '', wcSettings.woocommerceTranslation ] ];

	if ( window.wcAdminFeatures.devdocs ) {
		pages.push( {
			container: DevDocs,
			path: '/devdocs',
			breadcrumbs: ( { location } ) => {
				const { component } = getUrlParams( location.search );

				if ( component ) {
					return [
						...initialBreadcrumbs,
						[ '/devdocs', 'Documentation' ],
						component,
					];
				}

				return [ ...initialBreadcrumbs, 'Documentation' ];
			},
			wpOpenMenu: 'toplevel_page_woocommerce',
		} );
	}

	if (
		window.wcAdminFeatures[ 'analytics-dashboard' ] &&
		! window.wcAdminFeatures.homescreen
	) {
		pages.push( {
			container: Dashboard,
			path: '/',
			breadcrumbs: [
				...initialBreadcrumbs,
				__( 'Dashboard', 'woocommerce-admin' ),
			],
			wpOpenMenu: 'toplevel_page_woocommerce',
		} );
	}

	if ( window.wcAdminFeatures.homescreen ) {
		pages.push( {
			container: Homescreen,
			path: '/',
			breadcrumbs: [
				...initialBreadcrumbs,
				__( 'Home', 'woocommerce-admin' ),
			],
			wpOpenMenu: 'toplevel_page_woocommerce',
		} );
	}

	if ( window.wcAdminFeatures.analytics ) {
		if ( window.wcAdminFeatures.homescreen ) {
			pages.push( {
				container: Dashboard,
				path: '/analytics/overview',
				breadcrumbs: [
					...initialBreadcrumbs,
					[
						'/analytics/overview',
						__( 'Analytics', 'woocommerce-admin' ),
					],
					__( 'Overview', 'woocommerce-admin' ),
				],
				wpOpenMenu: 'toplevel_page_wc-admin-path--analytics-overview',
			} );
		}
		const ReportWpOpenMenu = `toplevel_page_wc-admin-path--analytics-${
			window.wcAdminFeatures.homescreen ? 'overview' : 'revenue'
		}`;

		pages.push( {
			container: AnalyticsSettings,
			path: '/analytics/settings',
			breadcrumbs: [
				...initialBreadcrumbs,
				[
					'/analytics/revenue',
					__( 'Analytics', 'woocommerce-admin' ),
				],
				__( 'Settings', 'woocommerce-admin' ),
			],
			wpOpenMenu: ReportWpOpenMenu,
		} );
		pages.push( {
			container: AnalyticsReport,
			path: '/customers',
			breadcrumbs: [
				...initialBreadcrumbs,
				__( 'Customers', 'woocommerce-admin' ),
			],
			wpOpenMenu: 'toplevel_page_woocommerce',
		} );
		pages.push( {
			container: AnalyticsReport,
			path: '/analytics/:report',
			breadcrumbs: ( { match } ) => {
				const report = find( getReports(), {
					report: match.params.report,
				} );
				if ( ! report ) {
					return [];
				}
				return [
					...initialBreadcrumbs,
					[
						'/analytics/revenue',
						__( 'Analytics', 'woocommerce-admin' ),
					],
					report.title,
				];
			},
			wpOpenMenu: ReportWpOpenMenu,
		} );
	}

	if ( window.wcAdminFeatures.marketing ) {
		pages.push( {
			container: MarketingOverview,
			path: '/marketing',
			breadcrumbs: [
				...initialBreadcrumbs,
				[
					'/marketing',
					__( 'Marketing', 'woocommerce-admin' ),
				],
				__( 'Overview', 'woocommerce-admin' ),
			],
			wpOpenMenu: 'toplevel_page_woocommerce-marketing',
		} );
	}

	return applyFilters( PAGES_FILTER, pages );
};

export class Controller extends Component {
	componentDidMount() {
		window.document.documentElement.scrollTop = 0;
	}

	componentDidUpdate( prevProps ) {
		const prevQuery = this.getQuery( prevProps.location.search );
		const prevBaseQuery = omit(
			this.getQuery( prevProps.location.search ),
			'chartType',
			'filter',
			'paged'
		);
		const baseQuery = omit(
			this.getQuery( this.props.location.search ),
			'chartType',
			'filter',
			'paged'
		);

		if ( prevQuery.paged > 1 && ! isEqual( prevBaseQuery, baseQuery ) ) {
			getHistory().replace( getNewPath( { paged: 1 } ) );
		}

		if ( prevProps.match.url !== this.props.match.url ) {
			window.document.documentElement.scrollTop = 0;
		}
	}

	getQuery( searchString ) {
		if ( ! searchString ) {
			return {};
		}

		const search = searchString.substring( 1 );
		return parse( search );
	}

	render() {
		const { page, match, location } = this.props;
		const { url, params } = match;
		const query = this.getQuery( location.search );

		window.wpNavMenuUrlUpdate( query );
		window.wpNavMenuClassChange( page, url );
		return (
			<Suspense fallback={ <Spinner /> }>
				<page.container
					params={ params }
					path={ url }
					pathMatch={ page.path }
					query={ query }
				/>
			</Suspense>
		);
	}
}

/**
 * Update an anchor's link in sidebar to include persisted queries. Leave excluded screens
 * as is.
 *
 * @param {HTMLElement} item - Sidebar anchor link.
 * @param {Object} nextQuery - A query object to be added to updated hrefs.
 * @param {Array} excludedScreens - wc-admin screens to avoid updating.
 */
export function updateLinkHref( item, nextQuery, excludedScreens ) {
	const isWCAdmin = /admin.php\?page=wc-admin/.test( item.href );

	if ( isWCAdmin ) {
		const search = last( item.href.split( '?' ) );
		const query = parse( search );
		const defaultPath =
			window.wcAdminFeatures.homescreen
				? 'homescreen'
				: 'dashboard';
		const path = query.path || defaultPath;
		const screen = path.replace( '/analytics', '' ).replace( '/', '' );

		const isExcludedScreen = excludedScreens.includes( screen );

		const href =
			'admin.php?' +
			stringify(
				Object.assign( query, isExcludedScreen ? {} : nextQuery )
			);

		// Replace the href so you can see the url on hover.
		item.href = href;

		item.onclick = ( e ) => {
			e.preventDefault();
			getHistory().push( href );
		};
	}
}

// Update's wc-admin links in wp-admin menu
window.wpNavMenuUrlUpdate = function( query ) {
	const excludedScreens = applyFilters( TIME_EXCLUDED_SCREENS_FILTER, [
		'devdocs',
		'stock',
		'settings',
		'customers',
		'homescreen',
	] );
	const nextQuery = getPersistedQuery( query );

	Array.from(
		document.querySelectorAll( '#adminmenu a' )
	).forEach( ( item ) => updateLinkHref( item, nextQuery, excludedScreens ) );
};

// When the route changes, we need to update wp-admin's menu with the correct section & current link
window.wpNavMenuClassChange = function( page, url ) {
	Array.from( document.getElementsByClassName( 'current' ) ).forEach(
		function( item ) {
			item.classList.remove( 'current' );
		}
	);

	const submenu = Array.from(
		document.querySelectorAll( '.wp-has-current-submenu' )
	);
	submenu.forEach( function( element ) {
		element.classList.remove( 'wp-has-current-submenu' );
		element.classList.remove( 'wp-menu-open' );
		element.classList.remove( 'selected' );
		element.classList.add( 'wp-not-current-submenu' );
		element.classList.add( 'menu-top' );
	} );

	const pageUrl =
		url === '/'
			? 'admin.php?page=wc-admin'
			: 'admin.php?page=wc-admin&path=' + encodeURIComponent( url );
	const currentItemsSelector =
		url === '/'
			? `li > a[href$="${ pageUrl }"], li > a[href*="${ pageUrl }?"]`
			: `li > a[href*="${ pageUrl }"]`;
	const currentItems = document.querySelectorAll( currentItemsSelector );

	Array.from( currentItems ).forEach( function( item ) {
		item.parentElement.classList.add( 'current' );
	} );

	if ( page.wpOpenMenu ) {
		const currentMenu = document.querySelector( '#' + page.wpOpenMenu );
		if ( currentMenu ) {
			currentMenu.classList.remove( 'wp-not-current-submenu' );
			currentMenu.classList.add( 'wp-has-current-submenu' );
			currentMenu.classList.add( 'wp-menu-open' );
			currentMenu.classList.add( 'current' );
		}
	}

	const wpWrap = document.querySelector( '#wpwrap' );
	wpWrap.classList.remove( 'wp-responsive-open' );
};