const allowedKeys = {
	37: "left",
  	38: "up",
  	39: "right",
  	40: "down",
  	65: 'a',
  	66: 'b'
};
const konamiCode = ["up", "up", "down", "down", "left", "right", "left", "right", 'b', 'a'];
let konamiCodePosition = 0;
let cheatState = false;

document.addEventListener("keydown", (event) => {
	if (event.keyCode === 8) {
		event.preventDefault();
		return false;
	}
});

document.addEventListener("keydown", (e) => {
	let key = allowedKeys[e.keyCode];
	let requiredKey = konamiCode[konamiCodePosition];

	if (key == requiredKey) {
		konamiCodePosition++;

		if (konamiCodePosition == konamiCode.length) {
			Cheats();
			konamiCodePosition = 0;
		}
	} else { konamiCodePosition = 0; }
});

const swapStyleSheet = (id, sheet) => {
	document.getElementById(id).setAttribute("href", sheet);
};

const Cheats = () => {
	if (!cheatState) {
        swapStyleSheet("main-style", "");
        swapStyleSheet("hl-style", "");
        cheatState = !cheatState;
    } else if (cheatState) {
        swapStyleSheet("main-style", "/css/style.css");
        swapStyleSheet("hl-style", "/css/tomorrow.min.css");
        cheatState = !cheatState;
    }
};