import { readFileSync } from 'node:fs';

const input = readFileSync('input', 'utf-8');

class Range {
  constructor(start, end) {
    this.start = start;
    this.end = end;

    if (this.start > this.end) {
      throw new Error('Invalid range');
    }
  }

  containsRange(range) {
    return (
      this.start <= range.start &&
      this.end >= range.end
    );
  }

  overlaps(range) {
    return (
      (range.start >= this.start && range.start <= this.end) ||
      (this.start >= range.start && this.start <= range.end)
    );
  }
}

const pairs = input
  .split('\n')
  .filter(line => line)
  .map(line => line
    .split(',')
    .map(range => new Range(...range
      .split('-')
      .map(num => parseInt(num))
    ))
  );

const containedPairCount = pairs
  .map(pair =>
    pair[0].containsRange(pair[1]) ||
    pair[1].containsRange(pair[0])
  )
  .reduce((total, contains) => total + Number(contains), 0);

console.log(`Contained pair count: ${containedPairCount}`);

const overlappingPairCount = pairs
  .map(pair => pair[0].overlaps(pair[1]))
  .reduce((total, overlaps) => total + Number(overlaps), 0)

console.log(`Overlapping pair count: ${overlappingPairCount}`);