import { Snackbar } from '@wordpress/components';
import { useEffect, useLayoutEffect, useState } from '@wordpress/element';
import { __ } from '@wordpress/i18n';
import { AnimatePresence, motion } from 'framer-motion';
import { NavigationButton } from '@launch/components/NavigationButton';
import {
	PagesSelect,
	fetcher as pagesSelectFetcher,
	fetchData as pagesSelectData,
	state as pagesSelectState,
} from '@launch/pages/PagesSelect';
import { useGlobalStore } from '@launch/state/Global';
import { usePagesStore } from '@launch/state/Pages';
import { useUserSelectionStore } from '@launch/state/user-selections';
import { RightCaret, LeftCaret } from '@launch/svg';

const PagesPageData = {
	component: PagesSelect,
	fetcher: pagesSelectFetcher,
	fetchData: pagesSelectData,
	state: pagesSelectState,
};

export const PageControl = () => {
	const {
		currentPageIndex,
		setPage,
		addPage,
		removePage,
		replaceHistory,
		pushHistory,
	} = usePagesStore();
	const { siteStructure } = useUserSelectionStore();

	useLayoutEffect(() => {
		// If we later add more structures, consider having predefined paths
		if (siteStructure === 'multi-page') {
			addPage('page-select', PagesPageData, 'layout');
			return;
		}
		removePage('page-select');
	}, [siteStructure, addPage, removePage]);

	useEffect(() => {
		const replaceStateHistory = () => {
			history.state === null && replaceHistory(currentPageIndex);
		};
		window.addEventListener('load', replaceStateHistory);

		const popstate = () => {
			const page = currentPageIndex - 1;
			if (page === -1) history.go(-1);
			setPage(page);
			pushHistory(page);
		};
		window.addEventListener('popstate', popstate);
		return () => {
			window.removeEventListener('load', replaceStateHistory);
			window.removeEventListener('popstate', popstate);
		};
	}, [setPage, replaceHistory, pushHistory, currentPageIndex]);

	return (
		<div className="flex justify-between">
			<span className="flex-1 self-start">
				<PrevButton />
			</span>
			<span className="hidden grow items-center justify-center md:flex">
				<Steps />
			</span>
			<span className="flex flex-1 justify-end">
				<NextButton />
			</span>
		</div>
	);
};

const Steps = () => {
	const { currentPageIndex, pages } = usePagesStore();
	const totalPages = usePagesStore((state) => state.count());
	const pagesList = Array.from(pages.entries());

	return (
		<div
			className="flex"
			role="progressbar"
			aria-valuenow={currentPageIndex}
			aria-valuemin="0"
			aria-valuetext={pagesList[currentPageIndex][1].state.getState().title}
			aria-valuemax={totalPages - 1}>
			{pagesList.map(([page], index) => {
				const bgColor =
					index < currentPageIndex ? 'bg-design-main' : 'bg-gray-200';
				return (
					<div key={page} className="flex items-center">
						{index !== currentPageIndex && (
							<div className={`${bgColor} h-2.5 w-2.5 rounded-full`} />
						)}
						{index === currentPageIndex && (
							<div className="flex h-4 w-4 items-center justify-center rounded-full bg-design-main">
								<div className="h-1.5 w-1.5 rounded-full bg-white/80" />
							</div>
						)}
						{index < totalPages - 1 && (
							<div className={`${bgColor} h-0.5 w-16`} />
						)}
					</div>
				);
			})}
		</div>
	);
};

const PrevButton = () => {
	const { previousPage, currentPageIndex } = usePagesStore();
	const onFirstPage = currentPageIndex === 0;

	if (onFirstPage) {
		return (
			<NavigationButton
				onClick={() =>
					(window.location.href = `${window.extSharedData.adminUrl}admin.php?page=extendify-assist`)
				}
				className="border-gray-200 bg-white text-design-main hover:bg-gray-50 focus:bg-gray-50">
				<>
					<LeftCaret className="mt-px h-5 w-5" />
					{__('Exit Launch', 'extendify-local')}
				</>
			</NavigationButton>
		);
	}

	return (
		<NavigationButton
			onClick={previousPage}
			data-test="back-button"
			className="border-gray-200 bg-white text-design-main hover:bg-gray-50 focus:bg-gray-50">
			<>
				<LeftCaret className="mt-px h-5 w-5" />
				{__('Back', 'extendify-local')}
			</>
		</NavigationButton>
	);
};

const NextButton = () => {
	const { nextPage, currentPageIndex, pages } = usePagesStore();
	const totalPages = usePagesStore((state) => state.count());
	const canLaunch = useUserSelectionStore((state) => state.canLaunch());
	const onLastPage = currentPageIndex === totalPages - 1;
	const currentPageKey = Array.from(pages.keys())[currentPageIndex];
	const pageState = pages.get(currentPageKey).state;
	const [canProgress, setCanProgress] = useState(false);
	const [canSkip, setCanSkip] = useState(false);
	const [validation, setValidation] = useState({});
	const [showValidationMessage, setShowValidationMessage] = useState(false);

	const nextPageOrComplete = () => {
		if (validation?.message) {
			setShowValidationMessage(true);
			const timeout = setTimeout(() => {
				setShowValidationMessage(false);
			}, 3000);
			return () => clearTimeout(timeout);
		}
		if (canLaunch && onLastPage) {
			useGlobalStore.setState({ generating: true });
		} else {
			nextPage();
		}
	};

	useEffect(() => {
		const { ready, canSkip, validation } = pageState?.getState() || {};
		setCanSkip(canSkip ?? false);
		setCanProgress(ready ?? false);
		setValidation(validation ?? {});
		return pageState.subscribe((s) => {
			setCanSkip(s.canSkip);
			setCanProgress(s.ready);
			setValidation(s.validation);
		});
	}, [pageState, currentPageIndex]);

	return (
		<>
			{canSkip ? (
				<NavigationButton
					onClick={() => nextPageOrComplete()}
					data-test="back-button"
					className="mr-2 border-gray-200 bg-white text-design-main hover:bg-gray-50 focus:bg-gray-50">
					<>
						{__('Skip', 'extendify-local')}
						<RightCaret className="mt-px h-5 w-5" />
					</>
				</NavigationButton>
			) : (
				<NavigationButton
					onClick={nextPageOrComplete}
					disabled={!canProgress}
					className="border-design-main bg-design-main text-design-text"
					data-test="next-button">
					<>
						{__('Next', 'extendify-local')}
						<RightCaret className="mt-px h-5 w-5" />
					</>
				</NavigationButton>
			)}
			<AnimatePresence>
				{showValidationMessage && validation && (
					<motion.div
						initial={{ opacity: 0, y: 20 }}
						animate={{ opacity: 1, y: 0 }}
						exit={{ opacity: 0, y: 20 }}
						className="extendify-launch fixed bottom-[100px] z-max flex w-full justify-end pb-4">
						<div className="shadow-2xl">
							<Snackbar
								actions={validation?.action ? [validation?.action] : []}>
								{validation?.message}
							</Snackbar>
						</div>
					</motion.div>
				)}
			</AnimatePresence>
		</>
	);
};