import { WebSocketServer } from 'ws';
import HistoryFile from './classes/HistoryFile.js';
import { MIN, MAX, RANGE } from './consts.js';
import { randomInt, randomInRange } from './utils/random.js';

// Define History file class
// For managing data state beyond restart
const history = new HistoryFile('data.json');

// Define WebSocket server
const wss = new WebSocketServer({ port: 8080 });

wss.on('connection', (ws) => {
  // On successful connection, we send history data to the client
  // After that, we procceed sending data update every 10 seconds
  ws.send(JSON.stringify({ type: 'history', data: history.history }));
});

// Generate initial random number, or take it from the history if that exists
let previousNumber = randomInt(MIN, MAX);
if (history.history.length > 0) {
  previousNumber = history.history[history.history.length - 1].number;
}

/*
 * Execute every 10 seconds
 * This will update hisotry data, by appending new entry
 * Then save this data to a history file
 * And notify all clients about new data entry
 */
setInterval(() => {
  const newNumber = randomInRange(previousNumber, RANGE, MIN, MAX);
  const newEntry = history.append(newNumber);

  // Send new entry to all connected clients
  wss.clients.forEach((client) => {
    if (client.readyState !== WebSocket.OPEN) return;
    client.send(JSON.stringify({ type: 'update', data: newEntry }));
  });
}, 10 * 1000);