#include <assert.h>
#include <stdlib.h>
#include <string.h>

#include "dims.h"

struct ct_dims *new_dims(int x, int y, int width, int height) {
  struct ct_dims *dims;

  dims = (struct ct_dims *)malloc(sizeof(struct ct_dims));
  *dims = (struct ct_dims){
      .x = x,
      .y = y,
      .width = width,
      .height = height,
  };
  return dims;
}

struct ct_dims *dup_dims(const struct ct_dims *const dims) {
  struct ct_dims *dup;
  dup = (struct ct_dims *)malloc(sizeof(struct ct_dims));
  memcpy(dup, dims, sizeof(struct ct_dims));

  return dup;
}

/* Calculate the dimensions for nodes resulting from a bifurcation.
 * Returns 0 on success, and 1 on failure if any width/height are 0 characters.
 * WARNING: This function does not guarantee the x,y positions returned
 * WARNING: are valid screen coordinates.
 */
int bifurcate_dims(const struct ct_dims *const parent_dims,
                   const enum ct_axis axis, const float ratio,
                   struct ct_dims **const dims0, struct ct_dims **const dims1) {
  assert(0 < ratio && ratio < 1);
  struct ct_dims *_dims0, *_dims1;

  _dims0 = dup_dims(parent_dims);
  _dims1 = dup_dims(parent_dims);

  if (axis == AXIS_X) {
    _dims0->width *= ratio;
    _dims1->width -= _dims0->width;
    _dims1->x += _dims0->width;
  } else {
    _dims0->height *= ratio;
    _dims1->height -= _dims0->height;
    _dims1->y += _dims0->height;
  }

  if (!_dims0->width || !_dims0->height || !_dims1->width || !_dims1->height)
    return 1;

  // propagate bifurcated dimensions
  *dims0 = _dims0;
  *dims1 = _dims1;
  return 0;
}