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import Image from 'next/image';
import { useState, useEffect, memo } from 'react';
interface CachedImageProps {
src: string | null;
alt: string;
fill?: boolean;
className?: string;
sizes?: string;
width?: number;
height?: number;
onGenerateCachedImageUrl: (url: string) => Promise<string>;
fallback?: React.ReactNode;
}
const imageUrlCache = new Map<string, string>();
const loadingPromises = new Map<string, Promise<string>>();
const CachedImageComponent = ({
src,
alt,
fill,
className,
sizes,
width,
height,
onGenerateCachedImageUrl,
fallback,
}: CachedImageProps) => {
const [cachedUrl, setCachedUrl] = useState<string | null>(() => {
return src ? imageUrlCache.get(src) || null : null;
});
const [loading, setLoading] = useState(() => !src || !imageUrlCache.has(src));
const [error, setError] = useState<Error | null>(null);
useEffect(() => {
if (!src) {
setTimeout(() => {
setLoading(false);
}, 0);
return;
}
const cached = imageUrlCache.get(src);
if (cached) {
setTimeout(() => {
setCachedUrl(cached);
setLoading(false);
}, 0);
return;
}
let cancelled = false;
const loadImage = async () => {
try {
setLoading(true);
setError(null);
let loadPromise = loadingPromises.get(src);
if (!loadPromise) {
loadPromise = onGenerateCachedImageUrl(src);
loadingPromises.set(src, loadPromise);
loadPromise.finally(() => {
loadingPromises.delete(src);
});
}
const url = await loadPromise;
if (!cancelled) {
imageUrlCache.set(src, url);
setCachedUrl(url);
setLoading(false);
}
} catch (err) {
if (!cancelled) {
setError(err instanceof Error ? err : new Error('Failed to load image'));
setLoading(false);
}
}
};
loadImage();
return () => {
cancelled = true;
};
}, [src, onGenerateCachedImageUrl]);
if (loading) {
return (
<div className={className}>
<div className='bg-base-200 h-full w-full animate-pulse' />
</div>
);
}
if (error || !cachedUrl) {
if (fallback) {
return <>{fallback}</>;
}
return (
<div className={`flex h-full w-full items-center justify-center ${className || ''}`}>
<div className='text-base-content/30'>
<svg className='h-16 w-16' fill='none' stroke='currentColor' viewBox='0 0 24 24'>
<path
strokeLinecap='round'
strokeLinejoin='round'
strokeWidth={2}
d='M12 6.253v13m0-13C10.832 5.477 9.246 5 7.5 5S4.168 5.477 3 6.253v13C4.168 18.477 5.754 18 7.5 18s3.332.477 4.5 1.253m0-13C13.168 5.477 14.754 5 16.5 5c1.747 0 3.332.477 4.5 1.253v13C19.832 18.477 18.247 18 16.5 18c-1.746 0-3.332.477-4.5 1.253'
/>
</svg>
</div>
</div>
);
}
if (fill) {
return <Image src={cachedUrl} alt={alt} fill className={className} sizes={sizes} />;
}
return (
<Image
src={cachedUrl}
alt={alt}
width={width}
height={height}
className={className}
sizes={sizes}
/>
);
};
const arePropsEqual = (prevProps: CachedImageProps, nextProps: CachedImageProps) => {
return (
prevProps.src === nextProps.src &&
prevProps.alt === nextProps.alt &&
prevProps.fill === nextProps.fill &&
prevProps.className === nextProps.className &&
prevProps.sizes === nextProps.sizes &&
prevProps.width === nextProps.width &&
prevProps.height === nextProps.height
);
};
export const CachedImage = memo(CachedImageComponent, arePropsEqual);
export const clearImageCache = () => {
imageUrlCache.clear();
loadingPromises.clear();
};
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