const fs = require('fs');

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

// Part One
let totalPriority = 0;

for (i in inputArray) {
  const contents = (inputArray[i]);
  const intersection = getIntersection(contents);
  const priority = getPriority(intersection);
  totalPriority += priority;
}

console.log(totalPriority);


// Part Two
totalPriority = 0;
let group = [];

for (i in inputArray) {
  const contents = (inputArray[i]);
  group.push(contents.split(""));
  if (group.length === 3) {
    const badge = getBadge(group);
    const priority = getPriority(badge);
    totalPriority += priority;
    group = [];
  }
}

console.log(totalPriority);

// functions

function getBadge(arrs) {
  let badge = arrs[0];
  for(let i = 1; i < arrs.length; i++){
    badge = intersection(badge, arrs[i]);
  };
  return badge[0];
}

function getIntersection(contents) {
  const length = contents.length;
  const first = contents.substring(0, length / 2).split("");
  const second = contents.substring(length / 2).split("");
  return intersection(first, second)[0];
}

function getPriority(char) {
  const characters = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
  return characters.indexOf(char) + 1;
}

function intersection(first, second) {
  return first.filter(x => second.includes(x));
};