const axios = require('axios');
const polylineLib = require('@mapbox/polyline');
require('dotenv').config({ path: '.env' });

function distKm(lat1, lng1, lat2, lng2) {
  const dLat = (lat2 - lat1) * Math.PI / 180;
  const dLng = (lng2 - lng1) * Math.PI / 180;
  const a = Math.sin(dLat/2)**2 + Math.cos(lat1*Math.PI/180) * Math.cos(lat2*Math.PI/180) * Math.sin(dLng/2)**2;
  return 6371 * 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a));
}

function interpolatePolyline(coords, maxDistKm = 0.05) {
  const newCoords = [];
  if(coords.length === 0) return newCoords;
  newCoords.push(coords[0]);
  for(let i=1; i<coords.length; i++) {
    const p1 = coords[i-1];
    const p2 = coords[i];
    const d = distKm(p1[0], p1[1], p2[0], p2[1]);
    if(d > maxDistKm) {
        const steps = Math.ceil(d / maxDistKm);
        for(let step=1; step<steps; step++) {
            const fraction = step / steps;
            const lat = p1[0] + (p2[0] - p1[0]) * fraction;
            const lng = p1[1] + (p2[1] - p1[1]) * fraction;
            newCoords.push([lat, lng]);
        }
    }
    newCoords.push(p2);
  }
  return newCoords;
}

async function testInterpolatedToulouse() {
  const apiKey = process.env.API_MAPS;
  const resToll = await axios.post('https://routes.googleapis.com/directions/v2:computeRoutes', {
      travelMode: 'DRIVE', routingPreference: 'TRAFFIC_UNAWARE',
      origin: { address: "25 Impasse du Puits du Suc, Saint-Martin-en-Haut, France" },
      destination: { address: "Toulouse, France" },
  }, { headers: { 'Content-Type': 'application/json', 'X-Goog-Api-Key': apiKey, 'X-Goog-FieldMask': 'routes.polyline.encodedPolyline' } });

  const poly = resToll.data.routes[0].polyline.encodedPolyline;
  const coords = polylineLib.decode(poly, 5);
  
  const interpolated = interpolatePolyline(coords, 0.05); // 50 meters
  console.log(`Original points: ${coords.length}, Interpolated: ${interpolated.length}`);
  
  const polyInt = polylineLib.encode(interpolated, 5);

  const ulysUrl = `https://api-ulys.azure-api.net/placemark/v2/legs?precision=5&includeLayersIds=GaresPeage`;
  
  try {
      const res = await axios.post(ulysUrl, JSON.stringify(polyInt), {
          headers: { 'Content-Type': 'application/json' }
      });
      const feats = res.data.features || res.data;
      console.log(`Found ${feats.length} gates.`);
      feats.forEach(f => {
          const pm = f.Placemark || f.placemark || {};
          console.log(pm.Preview || pm.preview || "Gate");
      });
  } catch(e) {
      console.log("Error:", e.message);
  }
}
testInterpolatedToulouse();