#include <stdint.h>
#include <stdlib.h>
#include <wayland-client.h>

#include <X11/Xlib.h>

#include "private.h"

union entry {
	uintptr_t next;
	void *data;
};

XID
csx_display_add_resource(struct csx_display *display, void *p)
{
	union entry *e, *map;
	int size;

	if (display->free_resource > 0) {
		e = display->resource_map + display->free_resource;
		display->free_resource = e->next;
	} else {
		if (display->resource_count == display->resource_size) {
			if (display->resource_size == 0)
				size = 256;
			else
				size = display->resource_size * 2;
			map = realloc(display->resource_map,
				      size * sizeof *e);
			if (map == NULL)
				return None;
			display->resource_map = map;
			display->resource_size = size;
		}

		e = display->resource_map + display->resource_count;
		display->resource_count++;
	}

	e->data = p;

	return e - display->resource_map;
}

void
csx_display_remove_resource(struct csx_display *display, XID id)
{
	union entry *e;

	e = display->resource_map + id;
	e->next = display->free_resource;
	display->free_resource = id;
}

void *
csx_display_lookup_resource(struct csx_display *display, XID id)
{
	/* FIXME: verify that we're looking up a valid resource:
	 * inside valid range and not in free-list. */

	if (id >= display->resource_size)
		return NULL;

	return display->resource_map[id].data;
}