const sample1 = await Deno.readTextFile("sample1.txt");
const sample2 = await Deno.readTextFile("sample2.txt");
const input = await Deno.readTextFile("input.txt");

const solvePart1 = (data: string): number =>
  data
    .split("\n")
    .filter(Boolean)
    .map((line) => [
      new Set(line.substring(0, line.length / 2).split("")),
      new Set(line.substring((line.length - 1) / 2 + 1, line.length).split("")),
    ])
    .map(([set1, set2]) => [...set1].filter((v) => set2.has(v)).pop())
    .map((c) => c?.charCodeAt(0)!)
    .map((c) => c - (c > 96 ? 96 : 64 - 26))
    .reduce((sum, value) => sum + value, 0);

console.log("Sample1:", solvePart1(sample1));
console.log("Input", solvePart1(input));

const solvePart2 = (data: string): number =>
  data
    .split("\n")
    .filter(Boolean)
    .map((line) => new Set(line.split("")))
    .reduce((result, set, index) => {
      const resultIndex = Math.floor(index / 3);
      result[resultIndex] = [...(result[resultIndex] || []), set];
      return result;
    }, [] as Set<string>[][])
    .map(([set1, set2, set3]) =>
      [...set1].filter((v) => set2.has(v) && set3.has(v)).pop()
    )
    .map((c) => c?.charCodeAt(0)!)
    .map((c) => c - (c > 96 ? 96 : 64 - 26))
    .reduce((sum, value) => sum + value, 0);

console.log("Sample:", solvePart2(sample2));
console.log("Input", solvePart2(input));