package day06

import "math/bits"

type Solver struct {
	inputLine []byte
}

func (s *Solver) ParseInput(input []string) {
	s.inputLine = []byte(input[0])
}

func (s *Solver) solve(numNeeded int) any {
	for i := numNeeded - 1; i < len(s.inputLine); i++ {
		var seenMap uint32

		for j := i - numNeeded + 1; j <= i; j++ {
			bitValue := uint32(1 << (s.inputLine[j] - 'a'))
			if seenMap&bitValue > 0 {
				break
			}
			seenMap |= bitValue
		}

		if bits.OnesCount32(seenMap) == numNeeded {
			return i + 1
		}
	}

	return -1
}

func (s *Solver) SolvePart1() any {
	return s.solve(4)
}

func (s *Solver) SolvePart2() any {
	return s.solve(14)
}