import { BlockPreview } from '@wordpress/block-editor';
import { rawHandler } from '@wordpress/blocks';
import { Spinner } from '@wordpress/components';
import {
	useRef,
	useMemo,
	useState,
	useLayoutEffect,
	useCallback,
} from '@wordpress/element';
import { forwardRef } from '@wordpress/element';
import { pageNames } from '@shared/lib/pages';
import classNames from 'classnames';
import { AnimatePresence, motion } from 'framer-motion';
import themeJSON from '@launch/_data/theme-processed.json';
import { usePreviewIframe } from '@launch/hooks/usePreviewIframe';
import { getFontOverrides } from '@launch/lib/preview-helpers';
import { hexTomatrixValues, lowerImageQuality } from '@launch/lib/util';

export const PagePreview = forwardRef(
	({ style, siteTitle, loading, showNav = true }, ref) => {
		const previewContainer = useRef(null);
		const blockRef = useRef(null);
		const [ready, setReady] = useState(false);
		const variation = style?.variation;
		const theme = variation?.settings?.color?.palette?.theme;

		const onLoad = useCallback(
			(frame) => {
				frame.contentDocument?.getElementById('ext-tj')?.remove();
				// Run this 150 times at an interval of 100ms (15s)
				// This is a brute force check that the styles are there
				let lastRun = performance.now();
				let counter = 0;

				const variationStyles = themeJSON[variation?.title];
				const { customFontLinks, fontOverrides } = getFontOverrides(variation);
				const primaryColor = theme?.find(
					({ slug }) => slug === 'primary',
				)?.color;
				const [r, g, b] = hexTomatrixValues(primaryColor);

				const checkOnStyles = () => {
					if (counter >= 150) return;
					const now = performance.now();
					if (now - lastRun < 100) return requestAnimationFrame(checkOnStyles);
					lastRun = now;
					const content = frame?.contentDocument;
					if (content) {
						content.querySelector('[href*=load-styles]')?.remove();
						const siteTitleElement =
							content.querySelectorAll('[href*=site-title]');
						siteTitleElement?.forEach(
							(element) => (element.textContent = siteTitle),
						);
					}

					// Add custom font links if not already present
					if (
						customFontLinks &&
						!frame.contentDocument?.querySelector('[id^="ext-custom-font"]')
					) {
						frame.contentDocument?.head?.insertAdjacentHTML(
							'beforeend',
							customFontLinks,
						);
					}

					if (!frame.contentDocument?.getElementById('ext-tj')) {
						frame.contentDocument?.body?.insertAdjacentHTML(
							'beforeend',
							`<style id="ext-tj">
							.wp-block-missing { display: none !important }
							img.custom-logo, [class*=wp-duotone-] img[src^="data"] {
								filter: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg"><filter id="solid-color"><feColorMatrix color-interpolation-filters="sRGB" type="matrix" values="0 0 0 0 ${r} 0 0 0 0 ${g} 0 0 0 0 ${b} 0 0 0 1 0"/></filter></svg>#solid-color') !important;
							}
							${variationStyles}
							${fontOverrides}
						</style>`,
						);
					}

					// Look for any frames inside the iframe, like the html block
					const innerFrames = frame.contentDocument?.querySelectorAll('iframe');
					innerFrames?.forEach((inner) => {
						inner?.contentDocument
							?.querySelector('[href*=load-styles]')
							?.remove();
						inner?.contentDocument
							?.querySelector('body')
							?.classList.add('editor-styles-wrapper');

						// Add custom font links to inner frames if not already present
						if (
							customFontLinks &&
							!inner.contentDocument?.querySelector('[id^="ext-custom-font"]')
						) {
							inner.contentDocument?.head?.insertAdjacentHTML(
								'beforeend',
								customFontLinks,
							);
						}

						if (inner && !inner.contentDocument?.getElementById('ext-tj')) {
							inner.contentDocument?.body?.insertAdjacentHTML(
								'beforeend',
								`<style id="ext-tj">
								body { background-color: transparent !important; }
								body, body * { box-sizing: border-box !important; }
								${variationStyles}
								${fontOverrides}
							</style>`,
							);
						}
					});

					counter++;
					requestAnimationFrame(checkOnStyles); // recursive
				};
				checkOnStyles();
			},
			[variation, theme, siteTitle],
		);

		const { ready: showPreview } = usePreviewIframe({
			container: ref.current,
			ready,
			onLoad,
			loadDelay: 400,
		});

		const blocks = useMemo(() => {
			const links = [
				pageNames.about.title,
				pageNames.blog.title,
				pageNames.contact.title,
			];

			const code = [
				style?.headerCode,
				style?.patterns
					?.map(({ code }) => code)
					.flat()
					.join(''),
				style?.footerCode,
			]
				.filter(Boolean)
				.join('')
				.replace(
					// <!-- wp:navigation --> <!-- /wp:navigation -->
					/<!-- wp:navigation[.\S\s]*?\/wp:navigation -->/g,
					showNav
						? `<!-- wp:paragraph {"className":"tmp-nav"} --><p class="tmp-nav" style="word-spacing: 1.25rem;">${links.join(' ')}</p ><!-- /wp:paragraph -->`
						: '',
				)
				.replace(
					// <!-- wp:navigation /-->
					/<!-- wp:navigation.*\/-->/g,
					showNav
						? `<!-- wp:paragraph {"className":"tmp-nav"} --><p class="tmp-nav" style="word-spacing: 1.25rem;">${links.join(' ')}</p ><!-- /wp:paragraph -->`
						: '',
				)
				.replace(
					/<!--\s*wp:social-links\b[^>]*>.*?<!--\s*\/wp:social-links\s*-->/gis,
					// dont replace if showNav is true
					(match) => (showNav ? match : ''),
				)
				.replace(
					/<!-- wp:site-logo.*\/-->/g,
					'<!-- wp:paragraph {"className":"custom-logo"} --><p class="custom-logo" style="display:flex; align-items: center;"><img alt="" class="custom-logo" style="height: 32px;" src="https://images.extendify-cdn.com/demo-content/logos/ext-custom-logo-default.webp"></p ><!-- /wp:paragraph -->',
				);
			return rawHandler({ HTML: lowerImageQuality(code) });
		}, [style, showNav]);

		useLayoutEffect(() => {
			setReady(false);
			const timer = setTimeout(() => setReady(true), 0);
			return () => clearTimeout(timer);
		}, [blocks]);

		const isLoading = !showPreview && loading;

		return (
			<>
				<AnimatePresence>
					{(isLoading || !showPreview) && (
						<motion.div
							initial={{ opacity: 0.7 }}
							animate={{ opacity: 1 }}
							exit={{ opacity: 0 }}
							transition={{ duration: 0.3 }}
							className="pointer-events-none absolute inset-0 z-30"
							style={{
								// opacity: showPreview || !ready ? 0 : 1,
								backgroundColor: 'rgba(204, 204, 204, 0.25)',
								backgroundImage:
									'linear-gradient(90deg, rgba(255,255,255,0) 0%, rgba(255,255,255,0.5) 50%, rgba(255,255,255,0) 100%)',
								backgroundSize: '600% 600%',
								animation:
									'extendify-loading-skeleton 10s ease-in-out infinite',
							}}>
							<div className="absolute inset-0 flex items-center justify-center">
								<Spinner className="h-10 w-10 text-design-main" />
							</div>
						</motion.div>
					)}
				</AnimatePresence>
				<div
					data-test="layout-preview"
					ref={blockRef}
					className={classNames('group z-10 w-full bg-transparent', {
						'opacity-0': !showPreview,
					})}>
					<div
						ref={previewContainer}
						className="relative m-auto max-w-[1440px] rounded-lg">
						<BlockPreview
							blocks={blocks}
							viewportWidth={1440}
							additionalStyles={[
								{
									css: '.rich-text [data-rich-text-placeholder]:after { content: "" }',
								},
							]}
						/>
					</div>
				</div>
			</>
		);
	},
);
