aoc2024/day-06/internal/one/point.go

package one

import "fmt"

type coords struct {
	X int
	Y int
}

type point struct {
	coords
	direction int
}

func (p *point) String() string {
	return fmt.Sprintf("X: %d Y:%d Direction: %s", p.X, p.Y, []string{"N", "E", "S", "W"}[p.direction])
}

func (p *point) recalibrate() {
	switch p.direction {
	case N:
		p.Y++
	case E:
		p.X--
	case S:
		p.Y--
	case W:
		p.X++
	}

	if p.direction == W {
		p.direction = 0
	} else {
		p.direction++
	}
}

func nextPoint(current point) point {
	switch current.direction {
	case N:
		return point{coords{current.X, current.Y - 1}, current.direction}
	case E:
		return point{coords{current.X + 1, current.Y}, current.direction}
	case S:
		return point{coords{current.X, current.Y + 1}, current.direction}
	case W:
		return point{coords{current.X - 1, current.Y}, current.direction}
	default:
		return point{}
	}
}