const fs = require('fs');
const https = require('https');

async function main() {
    const env = fs.readFileSync('functions/.env', 'utf8');
    const apiKey = env.split('\n').find(l => l.startsWith('API_MAPS=')).split('=')[1].replace(/"/g, '').trim();

    const data = JSON.stringify({
        "travelMode": "DRIVE",
        "routingPreference": "TRAFFIC_AWARE",
        "origin": { "address": "401 route du camping, 69850 Saint Martin en haut" },
        "destination": { "address": "Salle des fêtes, Orliénas" }
    });

    const options = {
        hostname: 'routes.googleapis.com',
        path: '/directions/v2:computeRoutes',
        method: 'POST',
        headers: {
            'Content-Type': 'application/json',
            'X-Goog-Api-Key': apiKey,
            'X-Goog-FieldMask': 'routes.distanceMeters,routes.duration,routes.polyline.encodedPolyline',
            'Content-Length': data.length
        }
    };

    const req = https.request(options, res => {
        let body = '';
        res.on('data', d => body += d);
        res.on('end', () => {
            const json = JSON.parse(body);
            const encoded = json.routes[0].polyline.encodedPolyline;
            console.log("Encoded string length:", encoded.length);
            
            // decode
            let index = 0, len = encoded.length;
            let lat = 0, lng = 0;
            const poly = [];
            while (index < len) {
                let b, shift = 0, result = 0;
                do {
                    b = encoded.charCodeAt(index++) - 63;
                    result |= (b & 0x1f) << shift;
                    shift += 5;
                } while (b >= 0x20);
                let dlat = ((result & 1) !== 0 ? ~(result >> 1) : (result >> 1));
                lat += dlat;

                shift = 0;
                result = 0;
                do {
                    b = encoded.charCodeAt(index++) - 63;
                    result |= (b & 0x1f) << shift;
                    shift += 5;
                } while (b >= 0x20);
                let dlng = ((result & 1) !== 0 ? ~(result >> 1) : (result >> 1));
                lng += dlng;

                poly.push([lat / 1e5, lng / 1e5]);
            }
            
            console.log("Decoded points:", poly.length);
            for(let i=0; i<5; i++) console.log(poly[i]);
            
            // Search for exploding coordinates
            for(let i=0; i<poly.length; i++) {
                if (Math.abs(poly[i][0]) > 90 || Math.abs(poly[i][1]) > 180) {
                    console.log("EXPLODED AT INDEX", i, "POINT:", poly[i]);
                    break;
                }
            }
        });
    });

    req.write(data);
    req.end();
}

main();