const fs = require('fs');

//const inputArray = fs.readFileSync('sample.txt').toString().split("\n");
const inputArray = fs.readFileSync('input.txt').toString().split("\n");

// Part One

let x = 1;
let cycle = 0;
let samples = [];

for (i in inputArray) {
  cycle++;
  getSample();
  const contents = inputArray[i].split(" ");
  const instruction = contents[0];
  if (instruction === 'addx') {
    cycle++;
    getSample();
    x += parseInt(contents[1], 10);
  }
}

const countedSamples = samples.slice(0, 7);
console.log(countedSamples.reduce((partialSum, a) => partialSum + a, 0));


// Part Two

x = 1;
cycle = 0;
let pixels = [];

for (i in inputArray) {
  cycle++;
  setPixel();
  const contents = inputArray[i].split(" ");
  const instruction = contents[0];
  if (instruction === 'addx') {
    cycle++;
    setPixel();
    x += parseInt(contents[1], 10);
  }
}

const screen = [];
for (let i = 0; i < 6; i++) {
  const line = pixels.slice(i * 40, (i + 1) * 40).join('');
  screen.push(line)
}
console.log(screen);

// functions

function getSample() {
  if (cycle === 20 || (cycle - 20) % 40 === 0) {
    samples.push(cycle * x);
  }
}

function setPixel() {
  const position = cycle % 40;
  if (position >= x && position <= x + 2) {
    pixels.push('#');
  } else {
    pixels.push('.');
  }
}