const WebSocket = require('ws');
const { encode } = require('@msgpack/msgpack');

const SERVER_URL = process.env.SERVER_URL || 'http://localhost:3000';
const WS_URL = process.env.WS_URL || 'ws://localhost:3000';
const SENSOR_NAME = process.env.SENSOR_NAME || 'sensor-01';
const SENSOR_CODE = process.env.SENSOR_CODE || 'password123';

async function authenticate() {
    const res = await fetch(`${SERVER_URL}/connect/`, {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ name: SENSOR_NAME, code: SENSOR_CODE }),
    });

    if (!res.ok) {
        const err = await res.json();
        throw new Error(`Auth failed: ${err.error}`);
    }

    const data = await res.json();
    console.log('Authenticated, token received');
    return data.t;
}

function connectWebSocket(token) {
    const ws = new WebSocket(`${WS_URL}?token=${token}`);

    ws.on('open', () => {
        console.log('WebSocket connected');
        startSendingData(ws);
    });

    ws.on('pong', () => {
        // Keepalive pong received
    });

    ws.on('close', (code, reason) => {
        console.log(`WebSocket closed: ${code} ${reason}`);
        process.exit(1);
    });

    ws.on('error', (err) => {
        console.error('WebSocket error:', err.message);
    });
}

function startSendingData(ws) {
    setInterval(() => {
        if (ws.readyState !== WebSocket.OPEN) return;

        const packet = {
            ts: Date.now(),
            t: 20 + Math.random() * 10,        // temperature °C
            h: 50 + Math.random() * 30,         // humidity %
            spd: Math.random() * 30,             // speed
            cog: Math.random() * 360,            // course over ground
            sog: 5 + Math.random() * 10,         // speed over ground kn
            hdg: Math.random() * 360,            // heading true
            lat: 43.7230 + Math.random() * 0.01, // latitude
            lon: 10.3966 + Math.random() * 0.01, // longitude
        };

        ws.send(Buffer.from(encode(packet)));
    }, 1000);
}

async function main() {
    try {
        const token = await authenticate();
        connectWebSocket(token);
    } catch (err) {
        console.error(err.message);
        process.exit(1);
    }
}

main();