// SPDX-License-Identifier: LGPL-3.0-or-later
#include "util.h"
#include <cmath>

void transform_mut(Transformation transformation, int &x, int &y) {
  if ((transformation & TRANSFORM_ROTATE_CW) != 0) {
    std::swap(x, y);
    x = -x;
  }
  if ((transformation & TRANSFORM_ROTATE_CCW) != 0) {
    std::swap(x, y);
    y = -y;
  }
  if ((transformation & TRANSFORM_MIRROR_X) != 0) {
    y = -y;
  }
  if ((transformation & TRANSFORM_MIRROR_Y) != 0) {
    x = -x;
  }
}

std::pair<int, int> transform(Transformation transformation, int x, int y) {
  transform_mut(transformation, x, y);
  return std::make_pair(x, y);
}

void transform_inv_mut(Transformation transformation, int &x, int &y) {
  if ((transformation & TRANSFORM_MIRROR_Y) != 0) {
    x = -x;
  }
  if ((transformation & TRANSFORM_MIRROR_X) != 0) {
    y = -y;
  }
  if (transformation & TRANSFORM_ROTATE_CCW) {
    // does clockwise rotation
    std::swap(x, y);
    x = -x;
  }
  if (transformation & TRANSFORM_ROTATE_CW) {
    // does counterclockwise rotation
    std::swap(x, y);
    y = -y;
  }
}

std::pair<int, int> transform_inv(Transformation transformation, int x, int y) {
  transform_inv_mut(transformation, x, y);
  return std::make_pair(x, y);
}