import db from '../lib/db';
import * as satellite from 'satellite.js';

const MY_LAT = 55.6683; 
const MY_LON = 12.5333;
const MY_ALT = 0; // Altitude in kilometers

async function updateISSData() {
  console.log("🛰️ Fetching TLE data...");
  
  const response = await fetch('https://celestrak.org/NORAD/elements/gp.php?CATNR=25544&FORMAT=tle');
  const data = await response.text();
  const lines = data.split('\n').filter(line => line.trim().length > 0);
  
  const line1 = lines[1];
  const line2 = lines[2];

  // 1. Initialize satellite record from TLE
  const satrec = satellite.twoline2satrec(line1, line2);
  
  // 2. Observer coordinates in radians
  const observerGd = {
    longitude: satellite.degreesToRadians(MY_LON),
    latitude: satellite.degreesToRadians(MY_LAT),
    height: MY_ALT
  };

  let nextPassDate: Date | null = null;
  const now = new Date();

  // 3. Look ahead for the next 24 hours (1440 minutes)
  for (let i = 0; i < 1440; i++) {
    const checkTime = new Date(now.getTime() + i * 60000);
    const positionAndVelocity = satellite.propagate(satrec, checkTime);
    const gmst = satellite.gstime(checkTime);
    
    // Calculate Look Angles (Azimuth, Elevation, Range)
    if (typeof positionAndVelocity?.position !== 'boolean') {
        const positionEcf = satellite.eciToEcf(positionAndVelocity!.position, gmst);
        const lookAngles = satellite.ecfToLookAngles(observerGd, positionEcf);
        const elevation = satellite.radiansToDegrees(lookAngles.elevation);

        // If elevation > 0, the ISS is above your horizon!
        if (elevation > 0) {
          nextPassDate = checkTime;
          break; 
        }
    }
  }

  if (nextPassDate) {
    const upsert = db.prepare('INSERT INTO iss_passes (id, pass_time) VALUES (1, ?) ON CONFLICT(id) DO UPDATE SET pass_time=excluded.pass_time');
    upsert.run(nextPassDate.toISOString());
    console.log(`✅ Real orbital pass found: ${nextPassDate.toISOString()}`);
  } else {
    console.log("❌ No pass found in the next 24 hours (check your TLE or coordinates).");
  }
}

updateISSData().catch(console.error);