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

function* chunk(input, size) {
  let cc = [];
  for (const row of input) {
    cc.push(row);
    if (cc.length === 3) {
      yield cc;
      cc = [];
    }
  }
  if (cc.length !== 0) {
    throw new Error('leftovers!');
  }
}

const validTriangle = (sides) => {
  const hypotenuse = Math.max(...sides);
  const others = sides.slice();
  others.splice(sides.indexOf(hypotenuse), 1);
  return others[0] + others[1] > hypotenuse;
};

const parse = (input) =>
  Glib.fromLines(input).map(
    (triangle) =>
      triangle
        .trim()
        .split(/\s+/)
        .glib.toInts().array,
  );

module.exports = {
  '1': (input) => parse(input).filter(validTriangle).length,
  '2': (input) =>
    parse(input)
      .chunk(3)
      .flatMap(([a, b, c]) => {
        const output = [];
        for (let i = 0; i < 3; i++) {
          output.push([a[i], b[i], c[i]]);
        }
        return output;
      })
      .filter(validTriangle).length,
};