import React, { useEffect } from 'react';
import { LoadingEllipsis } from 'calypso/components/loading-ellipsis';
import { useSelector } from 'calypso/state';
import { getUrlData } from 'calypso/state/imports/url-analyzer/selectors';
import isSiteAutomatedTransfer from 'calypso/state/selectors/is-site-automated-transfer';
import { getSite, isJetpackSite, hasAllSitesList } from 'calypso/state/sites/selectors';
import { Importer, ImportJob, StepNavigator } from '../types';
import ImportContentOnly from './import-content-only';

interface Props {
	job?: ImportJob;
	siteId: number;
	siteSlug: string;
	stepNavigator?: StepNavigator;
	renderHeading?: boolean;
}

export const WordpressImporter: React.FunctionComponent< Props > = ( props ) => {
	const importer: Importer = 'wordpress';

	const { job, siteSlug, siteId, stepNavigator, renderHeading } = props;

	const siteItem = useSelector( ( state ) => getSite( state, siteId ) );
	const isSiteAtomic = useSelector( ( state ) => isSiteAutomatedTransfer( state, siteId ) );
	const isSiteJetpack = useSelector( ( state ) => isJetpackSite( state, siteId ) );
	const hasAllSitesFetched = useSelector( hasAllSitesList );
	const fromSiteAnalyzedData = useSelector( getUrlData );

	/**
	 ↓ Effects
	 */
	useEffect( checkImporterAvailability, [ siteId ] );

	function checkImporterAvailability() {
		isNotAtomicJetpack() && redirectToWpAdminImportPage();
	}

	function isNotAtomicJetpack() {
		return ! isSiteAtomic && isSiteJetpack;
	}

	function redirectToWpAdminImportPage() {
		stepNavigator?.goToWpAdminImportPage?.();
	}

	/**
	 ↓ HTML
	 */
	return (
		<>
			{ ( () => {
				if ( isNotAtomicJetpack() || ! hasAllSitesFetched ) {
					return (
						<div className="import-layout__center">
							<LoadingEllipsis />;
						</div>
					);
				}

				return (
					<ImportContentOnly
						job={ job }
						importer={ importer }
						siteItem={ siteItem }
						siteSlug={ siteSlug }
						siteAnalyzedData={ fromSiteAnalyzedData }
						stepNavigator={ stepNavigator }
						renderHeading={ renderHeading }
					/>
				);
			} )() }
		</>
	);
};

export default WordpressImporter;