#ifndef KARLOS_RECT_H
#define KARLOS_RECT_H

#include <stdbool.h>

/* --> x
 * |
 * V y
 */
struct rect {
    int x, y, xend, yend;
};

#define RECT_XYWH(x, y, w, h) (struct rect){ (x), (y), (x + w), (y + h) }

#define RECT_WIDTH(r) ((r).xend - (r).x)
#define RECT_HEIGHT(r) ((r).yend - (r).y)
#define RECT_XEND(r) ((r).xend)
#define RECT_YEND(r) ((r).yend)

// Moves `rect`.
void rect_translate(struct rect *rect, int delta_x, int delta_y);

// Clamps the rectangle `rect` to `boundary`.
// The rect is cut off at the edges of `boundary`.
// If there is no overlap, either width or height of the rect will be `0`.
void rect_clamp(struct rect *rect, const struct rect *boundary);

// Grows `rect` so that it encompasses both its original dimensions and `additional`.
void rect_union(struct rect *rect, const struct rect *additional);

// Example:
// struct rect rect = RECT_XYWH(5, 10, 100, 100);
// struct rect surrounding = RECT_XYWH(200, 200, 50, 500);
// rect_local_to_global(&rect, &surrounding);
// ASSERT(rect.x == 205 && rect.y == 210);
// ASSERT(RECT_WIDTH(rect) == 45 && RECT_HEIGHT(rect) == 100);
void rect_local_to_global(struct rect *rect, const struct rect *surrounding);

unsigned int rect_area(struct rect *rect);

bool rect_isempty(const struct rect *rect);

#endif