server.js

require('dotenv').config();
const express = require('express');
const bodyParser = require('body-parser');
const expect = require('chai');
const socket = require('socket.io');
const helmet = require('helmet');
const cors = require('cors');
const nocache = require("nocache");

const fccTestingRoutes = require('./routes/fcctesting.js');
const runner = require('./test-runner.js');

const app = express();

app.use(
  helmet({
    noSniff: true,
    xssFilter: true,
    hidePoweredBy: {
      setTo: "PHP 7.4.3",
    }
  })
);

app.use(nocache());

app.use(cors({ origin: '*' })); //For FCC testing purposes only

app.use('/public', express.static(process.cwd() + '/public'));
app.use('/assets', express.static(process.cwd() + '/assets'));

app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: true }));

// Index page (static HTML)
app.route('/')
  .get(function (req, res) {
    res.sendFile(process.cwd() + '/views/index.html');
  }); 

//For FCC testing purposes
fccTestingRoutes(app);
    
// 404 Not Found Middleware
app.use(function(req, res, next) {
  res.status(404)
    .type('text')
    .send('Not Found');
});

const portNum = process.env.PORT || 3000;

// Set up server and tests
const server = app.listen(portNum, () => {
  console.log(`Listening on port ${portNum}`);
  if (process.env.NODE_ENV==='test') {
    console.log('Running Tests...');
    setTimeout(function () {
      try {
        runner.run();
      } catch (error) {
        console.log('Tests are not valid:');
        console.error(error);
      }
    }, 1500);
  }
});

// Socket.io setup:
// Start app and bind 
// Socket.io to the same port
const io = socket(server);
const Collectible = require('./public/Collectible');
const { generateStartPos, canvasCalcs } = require('./public/canvas-data');

let currPlayers = [];
const destroyedMedals = [];

const generateMedal = () => {
  const rand = Math.random();
  let medalValue;

  if (rand < 0.6) {
    medalValue = 1;
  } else if (rand < 0.85) {
    medalValue = 2;
  } else {
    medalValue = 3;
  }

  return new Collectible({ 
    x: generateStartPos(canvasCalcs.playFieldMinX, canvasCalcs.playFieldMaxX, 5),
    y: generateStartPos(canvasCalcs.playFieldMinY, canvasCalcs.playFieldMaxY, 5),
    value: medalValue,
    id: Date.now()
  });
}

let medal = generateMedal();

io.sockets.on('connection', socket => {
  console.log(`New connection ${socket.id}`);

  socket.emit('init', { id: socket.id, players: currPlayers, medal });

  socket.on('new-player', obj => {
    obj.id = socket.id;
    currPlayers.push(obj);
    socket.broadcast.emit('new-player', obj);
  });

  socket.on('move-player', (dir, obj) => {
    const movingPlayer = currPlayers.find(player => player.id === socket.id);
    if (movingPlayer) {
      movingPlayer.x = obj.x;
      movingPlayer.y = obj.y;

      socket.broadcast.emit('move-player', { id: socket.id, dir, posObj: { x: movingPlayer.x, y: movingPlayer.y } });
    }
  });

  socket.on('stop-player', (dir, obj) => {
    const stoppingPlayer = currPlayers.find(player => player.id === socket.id);
    if (stoppingPlayer) {
      stoppingPlayer.x = obj.x;
      stoppingPlayer.y = obj.y;

      socket.broadcast.emit('stop-player', { id: socket.id, dir, posObj: { x: stoppingPlayer.x, y: stoppingPlayer.y } });
    }
  });
  
  socket.on('destroy-item', ({ playerId, medalValue, medalId }) => {
    if (!destroyedMedals.includes(medalId)) {
      const scoringPlayer = currPlayers.find(obj => obj.id === playerId);
      const sock = io.sockets.connected[scoringPlayer.id];

      scoringPlayer.score += medalValue;
      destroyedMedals.push(medalId);

      // Broadcast to all players when someone scores
      io.emit('update-player', scoringPlayer);

      // Communicate win state and broadcast losses
      if (scoringPlayer.score >= 100) {
        sock.emit('end-game', 'win');
        sock.broadcast.emit('end-game', 'lose');
      } 

      // Generate new medal and send it to all players
      medal = generateMedal();
      io.emit('new-medal', medal);
    }
  });

  socket.on('disconnect', () => {
    socket.broadcast.emit('remove-player', socket.id);
    currPlayers = currPlayers.filter(player => player.id !== socket.id);
  });
});

module.exports = app; // For testing