frontend/src/components/ui/progress.tsx

import * as React from "react";
import { cn } from "@/lib/utils";

export interface ProgressProps
  extends React.HTMLAttributes<HTMLDivElement> {
  value?: number;
}

const Progress = React.forwardRef<HTMLDivElement, ProgressProps>(
  ({ className, value, ...props }, ref) => {
    const isIndeterminate = value === undefined;
    
    return (
      <div
        ref={ref}
        className={cn(
          "relative h-4 w-full overflow-hidden rounded-full bg-secondary",
          className
        )}
        {...props}
      >
        <div
          className={cn(
            "h-full flex-1 transition-all",
            isIndeterminate
              ? "w-full bg-gradient-to-r from-primary via-purple-500 to-primary animate-gradient bg-[length:200%_100%]"
              : "w-full bg-primary"
          )}
          style={
            !isIndeterminate
              ? { transform: `translateX(-${100 - (value || 0)}%)` }
              : undefined
          }
        />
      </div>
    );
  }
);
Progress.displayName = "Progress";

export { Progress };