const { Glib } = require('../../lib');

module.exports = {
  '1': (input) =>
    Glib.fromLines(input)
      .map((boxId) => new Set(boxId.characterFrequencies.values()))
      .reduce(
        ([two, three], counts) => [
          two + (counts.has(2n) ? 1n : 0n),
          three + (counts.has(3n) ? 1n : 0n),
        ],
        [0n, 0n],
      )
      .glib.product(),
  '2': (input) => {
    const boxIds = Glib.fromLines(input).map(
      (boxId) =>
        Glib.fromSequence(0, boxId.length - 1).map((i) =>
          boxId.splice(Number(i), 1),
        ).array,
    ).array;
    for (let i = 0; i < boxIds.length; i++) {
      const left = boxIds[i];
      for (let j = i + 1; j < boxIds.length; j++) {
        const right = boxIds[j];
        for (let k = 0; k < left.length; k++) {
          if (left[k] === right[k]) {
            return left[k];
          }
        }
      }
    }
    throw new Error('no solution');
  },
};