const input = document.querySelector("body > pre").innerHTML.slice(0, -1).split("\n").map(a => {
  return a[0] == "c" ? "c," + a.split(" ")[1] : a[5] == "i" ? "a,0" : "b," + a.split(" ")[3];
}).map(a => [a.split(",")[0], Number(a.split(",")[1])])
let deck = Array(10007).fill("").map((_, a) => a)

const copy = x => { let y = JSON.parse(JSON.stringify(x)); y.__proto__ = Object.getPrototypeOf(x); return y }

const dealNew = x => copy(x).map((_, a, b) => b[b.length - a - 1])

function cutN(deck, n) {
  let oldDeck = copy(deck)
  let emptyDeck = oldDeck.splice(n > 0 ? n : n < 0 ? oldDeck.length + n : 0)
  return emptyDeck.concat(oldDeck)
}

function dealN(deck, n) {
  let emptyDeck = Array(deck.length)
  for (let i = 0, len = deck.length; i < len; i++) {
    emptyDeck[(i * n) % len] = deck[i]
  }
  return emptyDeck
}
for (let i = 0; i < input.length; i++) {
  switch (input[i][0]) {
    case "a":
      deck = dealNew(deck)
      break;
    case "b":
      deck = dealN(deck, input[i][1])
      break;
    case "c":
      deck = cutN(deck, input[i][1])
      break;
  }
}

console.log("Part 1: ", deck.indexOf(2019))