const { exec } = require('child_process');

// -----------------------------------------------------------------------------
// FOTO: GPS da ExifReader
// -----------------------------------------------------------------------------
function extractGpsFromExif(tags) {
  if (!tags?.gps) return null;

  const lat = tags.gps.Latitude;
  const lng = tags.gps.Longitude;
  const alt = tags.gps.Altitude;

  if (lat == null || lng == null) return null;

  return {
    lat: Number(lat),
    lng: Number(lng),
    alt: alt != null ? Number(alt) : null
  };
}

// -----------------------------------------------------------------------------
// VIDEO: GPS via exiftool (VERSIONE ORIGINALE CHE FUNZIONA)
// -----------------------------------------------------------------------------
function extractGpsWithExiftool(videoPath) {
  //console.log(videoPath);
  return new Promise((resolve) => {
    const cmd = `exiftool -n -G1 -a -gps:all -quicktime:all -user:all "${videoPath}"`;

    exec(cmd, (err, stdout) => {
      if (err || !stdout) return resolve(null);

      // 1) GPS Coordinates : <lat> <lng>
      const userData = stdout.match(/GPS Coordinates\s*:\s*([0-9.\-]+)\s+([0-9.\-]+)/i);
      if (userData) {
        return resolve({
          lat: Number(userData[1]),
          lng: Number(userData[2]),
          alt: null
        });
      }

      // 2) GPSLatitude / GPSLongitude
      const lat1 = stdout.match(/GPSLatitude\s*:\s*([0-9.\-]+)/i);
      const lng1 = stdout.match(/GPSLongitude\s*:\s*([0-9.\-]+)/i);
      if (lat1 && lng1) {
        return resolve({
          lat: Number(lat1[1]),
          lng: Number(lng1[1]),
          alt: null
        });
      }

      // 3) GPSCoordinates : <lat> <lng>
      const coords = stdout.match(/GPSCoordinates\s*:\s*([0-9.\-]+)\s+([0-9.\-]+)/i);
      if (coords) {
        return resolve({
          lat: Number(coords[1]),
          lng: Number(coords[2]),
          alt: null
        });
      }

      resolve(null);
    });
  });
}

module.exports = { extractGpsFromExif, extractGpsWithExiftool };