next-ai-draw-io/components/ai-elements/shimmer.tsx

"use client"

import { motion } from "motion/react"
import {
    type CSSProperties,
    type ElementType,
    type JSX,
    memo,
    useMemo,
} from "react"
import { cn } from "@/lib/utils"

export type TextShimmerProps = {
    children: string
    as?: ElementType
    className?: string
    duration?: number
    spread?: number
}

const ShimmerComponent = ({
    children,
    as: Component = "p",
    className,
    duration = 2,
    spread = 2,
}: TextShimmerProps) => {
    const MotionComponent = motion.create(
        Component as keyof JSX.IntrinsicElements,
    )

    const dynamicSpread = useMemo(
        () => (children?.length ?? 0) * spread,
        [children, spread],
    )

    return (
        <MotionComponent
            animate={{ backgroundPosition: "0% center" }}
            className={cn(
                "relative inline-block bg-[length:250%_100%,auto] bg-clip-text text-transparent",
                "[--bg:linear-gradient(90deg,#0000_calc(50%-var(--spread)),var(--color-background),#0000_calc(50%+var(--spread)))] [background-repeat:no-repeat,padding-box]",
                className,
            )}
            initial={{ backgroundPosition: "100% center" }}
            style={
                {
                    "--spread": `${dynamicSpread}px`,
                    backgroundImage:
                        "var(--bg), linear-gradient(var(--color-muted-foreground), var(--color-muted-foreground))",
                } as CSSProperties
            }
            transition={{
                repeat: Number.POSITIVE_INFINITY,
                duration,
                ease: "linear",
            }}
        >
            {children}
        </MotionComponent>
    )
}

export const Shimmer = memo(ShimmerComponent)