import styled from '@emotion/styled';
import { useEffect, useRef, useState } from 'react';
import { TbLoader3 } from 'react-icons/tb';
import { TfiWorld } from 'react-icons/tfi';
import { rotate } from '~/styles/keyframes';

const IMG_LOAD_TIMEOUT = 7_500;

interface LinkFaviconProps {
	url: string;
	size?: number;
}

const Favicon = styled.div({
	position: 'relative',
	display: 'flex',
	alignItems: 'center',
	justifyContent: 'center',
});

const FaviconLoader = styled.div(({ theme }) => ({
	position: 'absolute',
	top: 0,
	left: 0,
	color: theme.colors.font,
	backgroundColor: theme.colors.secondary,

	'& > *': {
		animation: `${rotate} 1s both reverse infinite linear`,
	},
}));

// The Favicon API should always return an image, so it's not really useful to keep the loader nor placeholder icon,
// but for slow connections and other random stuff, I'll keep this
export default function LinkFavicon({ url, size = 32 }: LinkFaviconProps) {
	const imgRef = useRef<HTMLImageElement>(null);

	const [isFailed, setFailed] = useState<boolean>(false);
	const [isLoading, setLoading] = useState<boolean>(true);

	const setFallbackFavicon = () => setFailed(true);
	const handleStopLoading = () => setLoading(false);

	const handleErrorLoading = () => {
		setFallbackFavicon();
		handleStopLoading();
	};

	useEffect(() => {
		// Ugly hack, onLoad cb not triggered on first load when SSR
		if (imgRef.current?.complete) {
			handleStopLoading();
			return;
		}
		const id = setTimeout(() => handleErrorLoading(), IMG_LOAD_TIMEOUT);
		return () => clearTimeout(id);
	}, [isLoading]);

	return (
		<Favicon>
			{!isFailed ? (
				<img
					src={`/favicon?url=${url}`}
					onError={handleErrorLoading}
					onLoad={handleStopLoading}
					height={size}
					width={size}
					alt="icon"
					ref={imgRef}
					decoding="async"
				/>
			) : (
				<TfiWorld size={size} />
			)}
			{isLoading && (
				<FaviconLoader style={{ height: `${size}px`, width: `${size}px` }}>
					<TbLoader3 size={size} />
				</FaviconLoader>
			)}
		</Favicon>
	);
}