aoc2023/day-5/one.go

package main

import (
	"math"

	log "github.com/sirupsen/logrus"
)

var identifiers = []string{"seed-to-soil", "soil-to-fertilizer", "fertilizer-to-water", "water-to-light", "light-to-temperature", "temperature-to-humidity", "humidity-to-location"}

func next(i int, datapoint int) int {
	if i == len(identifiers) {
		return datapoint
	}

	dest := func() int {
		datas := dataMap[identifiers[i]]
		dest := 0
		for _, data := range datas {
			if datapoint >= data.source && datapoint <= data.source+data.offset {
				dest = data.dest + (datapoint - data.source)
				break
			}
		}
		if dest == 0 {
			dest = datapoint
		}
		return dest
	}()
	//log.Debug(identifiers[i], ": ", dest)
	return next(i+1, dest)
}

// one returns the lowest location
func one(lines []string) (int, error) {
	lowest := math.MaxInt
	parseLines(lines)

	for _, seed := range seeds {
		location := next(0, seed)
		log.Info(location)
		if location < lowest {
			lowest = location
		}
	}

	return lowest, nil
}