package queenattack

import (
	"errors"
	"math"
)

// CanQueenAttack takes two positions one for a
// white queen (wq) and one for a black queen (bq)
// it returns a boolean value: if an attack can
// be made, and an error
func CanQueenAttack(wq, bq string) (bool, error) {
	if len(wq) != 2 || len(bq) != 2 ||
		wq[0] < 'a' || wq[0] > 'z' ||
		wq[1] < '0' || wq[1] > '8' ||
		bq[0] < 'a' || bq[0] > 'z' ||
		bq[1] < '0' || bq[1] > '8' ||
		wq == bq {
		return false, errors.New("Invalid pieces/placement")
	}
	wx, wy := float64(int8(wq[0])), float64(int8(wq[1]))
	bx, by := float64(int8(bq[0])), float64(int8(bq[1]))
	if wx == bx || wy == by ||
		math.Abs(wx-bx) == math.Abs(wy-by) {
		return true, nil
	}

	return false, nil
}