// utils/getVideoDuration.ts
export async function getVideoDuration(file: File): Promise<number> {
  return new Promise((resolve, reject) => {
    // create an object URL for the file
    const url = URL.createObjectURL(file);
    const video = document.createElement('video');

    // Make sure it doesn't try to load UI, just metadata
    video.preload = 'metadata';
    video.src = url;

    const cleanup = () => {
      URL.revokeObjectURL(url);
      video.removeAttribute('src');
      video.load();
    };

    video.addEventListener('loadedmetadata', () => {
      // duration in seconds (float)
      const duration = video.duration;
      cleanup();
      // Some encodings return Infinity — guard that
      if (!isFinite(duration) || duration <= 0) {
        return reject(new Error('Could not determine duration'));
      }
      resolve(Math.round(duration)); // return integer seconds
    });

    video.addEventListener('error', (e) => {
      cleanup();
      reject(new Error('Error reading video metadata'));
    });
  });
}