frontend/src/components/common/Loader.jsx

import './Loader.css';

/**
 * Loader component — Spinner + Skeleton variants
 * @param {Object} props
 * @param {boolean} [props.fullScreen] - Show centered full-screen loader
 * @param {string} [props.size] - 'sm' | 'md' | 'lg'
 * @param {string} [props.text] - Loading text
 */
export default function Loader({ fullScreen = false, size = 'md', text = '' }) {
  const spinner = (
    <div className={`loader loader--${size}`}>
      <div className="loader__spinner">
        <div className="loader__ring"></div>
        <div className="loader__ring"></div>
        <div className="loader__ring"></div>
        <img src="/logo.png" alt="" className="loader__logo" />
      </div>
      {text && <p className="loader__text">{text}</p>}
    </div>
  );

  if (fullScreen) {
    return <div className="loader__fullscreen">{spinner}</div>;
  }

  return spinner;
}

/**
 * Skeleton — Placeholder loading state
 */
export function Skeleton({ width = '100%', height = '20px', radius = '8px', className = '' }) {
  return (
    <div
      className={`skeleton ${className}`}
      style={{ width, height, borderRadius: radius }}
    />
  );
}

/**
 * Card Skeleton
 */
export function CardSkeleton({ count = 1 }) {
  return (
    <>
      {Array.from({ length: count }).map((_, i) => (
        <div key={i} className="card" style={{ padding: '1rem' }}>
          <Skeleton height="200px" radius="12px" />
          <div style={{ padding: '1rem 0' }}>
            <Skeleton width="40%" height="14px" />
            <div style={{ height: '8px' }} />
            <Skeleton width="80%" height="20px" />
            <div style={{ height: '8px' }} />
            <Skeleton width="100%" height="14px" />
            <div style={{ height: '4px' }} />
            <Skeleton width="60%" height="14px" />
          </div>
        </div>
      ))}
    </>
  );
}