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/**
* Unified Image Component
*
* A flexible image component that combines the best features from all image components:
* - Error handling with fallback
* - Loading skeleton/blur placeholder
* - Cloudinary integration
* - Aspect ratio support
* - Lazy loading via IntersectionObserver
* - Dark mode support
*
* @example
* ```tsx
* // Basic usage
* <Image
* src="/images/product.jpg"
* alt="Product"
* width={300}
* height={300}
* />
*
* // With Cloudinary
* <Image
* publicId="products/shirt"
* alt="Shirt"
* width={400}
* height={400}
* />
*
* // With loading effects
* <Image
* src="/images/hero.jpg"
* alt="Hero"
* width={1200}
* height={600}
* placeholder="blur"
* showSkeleton
* />
* ```
*/
import { useState, useCallback, useRef, useEffect, memo } from 'react';
import NextImage, { ImageProps as NextImageProps } from 'next/image';
import { cn } from '@/lib/core';
import {
buildCloudinaryUrl,
buildCloudinaryBlurPlaceholder,
generateBlurPlaceholder,
aspectRatioClasses,
objectFitClasses,
DEFAULT_PLACEHOLDER,
} from '@/lib/image';
export interface ImageProps extends Omit<NextImageProps, 'src' | 'placeholder'> {
/** Image source URL */
src?: string | null;
/** Cloudinary public ID (alternative to src) */
publicId?: string;
/** Fallback image URL on error */
fallback?: string;
/** Aspect ratio for container */
aspectRatio?: '1:1' | '4:3' | '16:9' | '3:4' | '21:9' | 'auto';
/** Object fit behavior */
objectFit?: 'cover' | 'contain' | 'fill' | 'none' | 'scale-down';
/** Placeholder type */
placeholder?: 'blur' | 'skeleton' | 'none';
/** Custom placeholder color (for blur) */
placeholderColor?: string;
/** Show loading skeleton */
showSkeleton?: boolean;
/** Lazy load with IntersectionObserver */
lazyLoad?: boolean;
/** IntersectionObserver root margin */
rootMargin?: string;
/** Container className */
containerClassName?: string;
/** Callback when image loads */
onLoadComplete?: () => void;
/** Callback when image fails */
onLoadError?: () => void;
}
// Check if IntersectionObserver is available
const hasIntersectionObserver =
typeof window !== 'undefined' && typeof IntersectionObserver !== 'undefined';
export const Image = memo(function Image({
src,
publicId,
fallback = DEFAULT_PLACEHOLDER,
alt,
width,
height,
aspectRatio,
objectFit = 'cover',
placeholder = 'skeleton',
placeholderColor = '#e5e7eb',
showSkeleton = true,
lazyLoad = false,
rootMargin = '200px',
className,
containerClassName,
priority,
onLoadComplete,
onLoadError,
...props
}: ImageProps) {
const [isLoading, setIsLoading] = useState(true);
const [hasError, setHasError] = useState(false);
const [isInView, setIsInView] = useState(!lazyLoad || !hasIntersectionObserver);
const containerRef = useRef<HTMLDivElement>(null);
// Determine image source
const imageSrc = hasError
? fallback
: publicId
? buildCloudinaryUrl(publicId)
: src || fallback;
// Generate blur placeholder
const numWidth = typeof width === 'number' ? width : parseInt(String(width), 10) || 300;
const numHeight = typeof height === 'number' ? height : parseInt(String(height), 10) || 300;
const blurDataURL =
placeholder === 'blur'
? publicId
? buildCloudinaryBlurPlaceholder(publicId)
: generateBlurPlaceholder(numWidth, numHeight, placeholderColor)
: undefined;
// Handle load
const handleLoad = useCallback(() => {
setIsLoading(false);
onLoadComplete?.();
}, [onLoadComplete]);
// Handle error
const handleError = useCallback(() => {
setHasError(true);
setIsLoading(false);
onLoadError?.();
}, [onLoadError]);
// Lazy loading with IntersectionObserver
useEffect(() => {
if (!lazyLoad || !hasIntersectionObserver || isInView) return;
const container = containerRef.current;
if (!container) return;
const observer = new IntersectionObserver(
([entry]) => {
if (entry.isIntersecting) {
setIsInView(true);
observer.disconnect();
}
},
{ rootMargin, threshold: 0.1 }
);
observer.observe(container);
return () => observer.disconnect();
}, [lazyLoad, rootMargin, isInView]);
// Determine if we should show placeholder
const showPlaceholderState =
(placeholder === 'skeleton' || showSkeleton) && isLoading;
return (
<div
ref={containerRef}
className={cn(
'relative overflow-hidden',
aspectRatio && aspectRatioClasses[aspectRatio],
containerClassName
)}
>
{/* Loading skeleton */}
{showPlaceholderState && (
<div
className="absolute inset-0 bg-gray-200 dark:bg-gray-700 animate-pulse"
aria-hidden="true"
/>
)}
{/* Only render image when in view (for lazy loading) */}
{isInView && (
<NextImage
src={imageSrc}
alt={alt}
width={width}
height={height}
priority={priority}
placeholder={placeholder === 'blur' && blurDataURL ? 'blur' : 'empty'}
blurDataURL={blurDataURL}
className={cn(
'transition-opacity duration-300',
isLoading ? 'opacity-0' : 'opacity-100',
objectFitClasses[objectFit],
className
)}
onLoad={handleLoad}
onError={handleError}
{...props}
/>
)}
</div>
);
});
/**
* HeroImage - Optimized for large hero/banner images
*/
export interface HeroImageProps extends Omit<ImageProps, 'priority' | 'aspectRatio'> {
/** Hero aspect ratio */
heroAspectRatio?: '16:9' | '21:9' | '4:3';
}
export const HeroImage = memo(function HeroImage({
heroAspectRatio = '16:9',
placeholder = 'blur',
...props
}: HeroImageProps) {
return (
// eslint-disable-next-line jsx-a11y/alt-text -- alt is passed via props spread
<Image
{...props}
aspectRatio={heroAspectRatio}
placeholder={placeholder}
priority
/>
);
});
/**
* ThumbnailImage - Optimized for small thumbnails
*/
export interface ThumbnailImageProps extends Omit<ImageProps, 'width' | 'height'> {
/** Thumbnail size in pixels */
size?: number;
}
export const ThumbnailImage = memo(function ThumbnailImage({
size = 80,
showSkeleton = true,
...props
}: ThumbnailImageProps) {
return (
// eslint-disable-next-line jsx-a11y/alt-text -- alt is passed via props spread
<Image {...props} width={size} height={size} showSkeleton={showSkeleton} />
);
});
/**
* CardImage - Optimized for card/grid layouts
*/
export interface CardImageProps extends Omit<ImageProps, 'width' | 'height'> {
/** Card image size preset */
size?: 'sm' | 'md' | 'lg';
}
const cardSizes = {
sm: { width: 200, height: 200 },
md: { width: 300, height: 300 },
lg: { width: 400, height: 400 },
};
export const CardImage = memo(function CardImage({
size = 'md',
placeholder = 'blur',
...props
}: CardImageProps) {
const dimensions = cardSizes[size];
return (
// eslint-disable-next-line jsx-a11y/alt-text -- alt is passed via props spread
<Image
{...props}
width={dimensions.width}
height={dimensions.height}
placeholder={placeholder}
/>
);
});
export default Image;
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