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

const parse = (input) =>
  Glib.fromLines(input).reduce((frequencies, string, index) => {
    if (index === 0) {
      frequencies = [];
      for (let i = 0; i < string.length; i++) {
        frequencies[i] = string[i].characterFrequencies;
      }
    } else {
      for (let i = 0; i < string.length; i++) {
        frequencies[i] = Maps.add(
          frequencies[i],
          string[i].characterFrequencies,
        );
      }
    }
    return frequencies;
  }, null);

module.exports = {
  '1': (input) =>
    parse(input)
      .glib.map((i) =>
        i.glibEntries.reduce(
          ([maxChar, maxCount], [char, count]) =>
            maxCount > count ? [maxChar, maxCount] : [char, count],
          ['!', -Infinity],
        ),
      )
      .map(([char]) => char).string,
  '2': (input) =>
    parse(input)
      .glib.map((i) =>
        i.glibEntries.reduce(
          ([minChar, minCount], [char, count]) =>
            count < minCount ? [char, count] : [minChar, minCount],
          ['!', Infinity],
        ),
      )
      .map(([char]) => char).string,
};