const { Glib, BNMath: Math, Vector, twodee } = require('../../lib');

const invalid = (input, preamble = 25) => {
  for (let i = preamble; i < input.length; i++) {
    const current = input[i];
    let solved = false;
    dance: for (let j = i - preamble; j < i; j++) {
      for (let k = j + 1; k < i; k++) {
        if (input[j] + input[k] === current) {
          solved = true;
          break dance;
        }
      }
    }
    if (!solved) {
      return current;
    }
  }
  throw new Error('no invalid found');
};

const parse = (input) => Glib.fromLines(input).toInts().array;

module.exports = {
  '1': (input) => invalid(parse(input)),
  '2': (input) => {
    input = parse(input);
    const target = invalid(input);
    dance: for (let i = 0; i < input.length - 1; i++) {
      for (let j = i + 1; j < input.length; j++) {
        const sum = input.slice(i, j).glib.sum();
        if (sum === target) {
          return input
            .slice(i, j)
            .glib.minMax()
            .glib.sum();
        } else if (sum > target) {
          continue dance;
        }
      }
    }
  },
};