input.js

let connection;  // Stores the active TCP connection object

const handleUserInput = (key) => {
  if (key === '\u0003') { // \u0003 maps to ctrl+c input
    process.exit();
  }
  // adding movement commands 
  if (key === 'w') {
    connection.write("Move: up");
  }
  if (key === 'a') {
    connection.write("Move: left");
  }
  if (key === 's') {
    connection.write("Move: down");
  }
  if (key === 'd') {
    connection.write("Move: right");
  }

  // Sending messages to the server
  if (key === '1') {
    connection.write("Say: I got this!!"); 
  }
  if (key === '2') {
    connection.write("Say: You can't beat me!"); 
  
    if (key === '3') {
    connection.write("Say: BOOOM!"); 
  }
  if (key === '4') {
    connection.write("Say: Better luck next time!"); 
  }

};

const setupInput = (conn) => {
  connection = conn;  // save the connection object
  const stdin = process.stdin;
  stdin.setRawMode(true);
  stdin.setEncoding('utf8');
  stdin.resume();
  stdin.on('data', handleUserInput);
  return stdin;
};

module.exports = { setupInput };