aoc2024/day-21/internal/one/solve.go

package one

import (
	"bytes"

	"github.com/onyx-and-iris/aoc2024/day-21/internal/pad"
	log "github.com/sirupsen/logrus"
)

func Solve(buf []byte) (int, error) {
	r := bytes.NewReader(buf)
	codes, err := parseLines(r)
	if err != nil {
		return 0, err
	}

	numpad := pad.NewNumpad()
	dirpad := pad.NewDirpad()

	var complexity int
	for _, code := range codes {
		moves := generateMoves(numpad, dirpad, code)
		complexity += len(moves) * numFromCode(code)
		log.Debugf("%s\n%d * %d\n", moves, len(moves), numFromCode(code))
	}

	return complexity, nil
}

type generator interface {
	Generate(code string) string
}

func generateMoves(n, d generator, code string) string {
	return d.Generate(d.Generate(n.Generate(code)))
}