package daythree

import (
	"advent-of-code/internal/registry"
	"os"
	"strconv"
)

func init() {
	registry.Register("2017D3", ParseInput, PartOne, PartTwo)
}

func ParseInput(filepath string) int {
	content, _ := os.ReadFile(filepath)
	data, _ := strconv.Atoi(string(content))
	return data
}

func abs(n int) int {
	if n < 0 {
		return -n
	}
	return n
}

func PartOne(data int) int {
	layer := 1

	for (2*layer+1)*(2*layer+1) < data {
		layer++
	}

	sideLength := 2*layer + 1
	offset := sideLength*sideLength - data
	side := offset / (sideLength - 1)
	position := offset % (sideLength - 1)

	coordinates := [4][2]int{
		{layer, layer - position},
		{layer - position, -layer},
		{-layer, -layer + position},
		{-layer + position, layer},
	}

	return abs(coordinates[side][0]) + abs(coordinates[side][1])
}

func PartTwo(data int) int {
	return 0
}