const axios = require('axios');
const fs = require('fs');
const path = require('path');
require('dotenv').config({ path: '.env' });
const { _distKm } = require('./src/travel.js');

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));
}

async function testTollSegments() {
  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: "Nice, France" },
  }, { headers: { 'Content-Type': 'application/json', 'X-Goog-Api-Key': apiKey, 'X-Goog-FieldMask': 'routes.legs.steps.navigationInstruction,routes.legs.steps.distanceMeters,routes.legs.steps.startLocation,routes.legs.steps.endLocation,routes.legs.steps.polyline.encodedPolyline' } });

  const steps = resToll.data.routes[0].legs[0].steps;
  
  const rawCsv = fs.readFileSync(path.join(__dirname, 'travel', 'gares_peage_export.csv'), 'utf8');
  const stations = [];
  const lines = rawCsv.split('\n');
  for (let i = 1; i < lines.length; i++) {
    const l = lines[i].trim();
    if (!l) continue;
    const parts = l.split(',');
    if (parts.length >= 4) {
      const idStr = String(parts[0]).padStart(5, '0');
      stations.push({
        id: idStr, operatorId: idStr.substring(0, 2), tollId: idStr.substring(2, 5),
        name: parts[1], lat: parseFloat(parts[2]), lon: parseFloat(parts[3]),
      });
    }
  }

  function getClosestGate(lat, lng) {
      let minDist = Infinity;
      let closest = null;
      for(let s of stations) {
          const d = distKm(lat, lng, s.lat, s.lon);
          if(d < minDist) { minDist = d; closest = s; }
      }
      return minDist < 5 ? closest : null;
  }

  const segments = [];
  let currentSegment = null;
  for(let i=0; i<steps.length; i++) {
      const step = steps[i];
      const inst = step.navigationInstruction ? step.navigationInstruction.instructions : '';
      const isToll = inst.toLowerCase().includes('péage') || inst.toLowerCase().includes('toll');
      
      if (isToll) {
          if (!currentSegment) {
              currentSegment = { steps: [] };
          }
          currentSegment.steps.push(step);
      } else {
          if (currentSegment) {
              segments.push(currentSegment);
              currentSegment = null;
          }
      }
  }
  if (currentSegment) segments.push(currentSegment);

  const polylineLib = require('@mapbox/polyline');
  let totalToll = 0;
  for (let i=0; i<segments.length; i++) {
      const seg = segments[i];
      let segCoords = [];
      for(let step of seg.steps) {
          if(step.polyline && step.polyline.encodedPolyline) {
              segCoords = segCoords.concat(polylineLib.decode(step.polyline.encodedPolyline, 5));
          }
      }
      
      const candidates = [];
      stations.forEach(s => {
          let minDist = Infinity;
          let minIndex = -1;
          for (let j = 0; j < segCoords.length; j++) {
              const d = distKm(s.lat, s.lon, segCoords[j][0], segCoords[j][1]);
              if (d < minDist) { minDist = d; minIndex = j; }
          }
          if (minDist < 2) { // must be within 2km of the segment
              candidates.push({ ...s, polyIndex: minIndex });
          }
      });
      candidates.sort((a, b) => a.polyIndex - b.polyIndex);
      
      let entry = null, exit = null;
      if (candidates.length > 0) {
          entry = candidates[0];
          exit = candidates[candidates.length - 1];
      }
      
      console.log(`Segment ${i+1}: points=${segCoords.length}, candidates=${candidates.length}, Entry=${entry?entry.name:'none'}, Exit=${exit?exit.name:'none'}`);

      
      if (entry && exit) {
          try {
              const passages = [
                  { operatorId: entry.operatorId, tollId: entry.tollId },
                  { operatorId: exit.operatorId, tollId: exit.tollId }
              ];
              const payload = {
                  vehicleCategory: "2", paymentOption: 2,
                  tollPassages: passages.map((p) => ({ toll: { operatorId: p.operatorId, tollId: p.tollId }, passageDate: new Date().toISOString() })),
              };
              const res = await axios.post('https://api-ulys.azure-api.net/tollstation/v1/rate', payload);
              const data = res.data;
              let price = 0;
              if (data.length === 1 && data[0].price > 0) price = data[0].price;
              if (data.length > 1) {
                  const pItem = data.find(d => d.price > 0);
                  if (pItem) price = pItem.price;
              }
              console.log(`  -> Price: ${price}€`);
              totalToll += price;
          } catch(e) { console.log(`  -> Ulys Error`); }
      }
  }
  console.log(`Total Toll: ${totalToll}€`);
}
testTollSegments();