// Copyright (c) 2014-2018, Loïc Hoguin <essen@ninenines.eu>
//
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

#include "esdl2.h"

// @todo These operations should probably occur in the thread.
void dtor_Window(ErlNifEnv* env, void* obj)
{
	SDL_Window* window = NIF_RES_GET(Window, obj);

	SDL_DestroyWindow(window);
	esdl2_windows_remove(window);
}

#if !SDL_VERSION_ATLEAST(2, 0, 6)
#define SDL_WINDOW_VULKAN 0x10000000
#endif

#define WINDOW_FLAGS(F) \
	F(fullscreen, SDL_WINDOW_FULLSCREEN) \
	F(opengl, SDL_WINDOW_OPENGL) \
	F(shown, SDL_WINDOW_SHOWN) \
	F(hidden, SDL_WINDOW_HIDDEN) \
	F(borderless, SDL_WINDOW_BORDERLESS) \
	F(resizable, SDL_WINDOW_RESIZABLE) \
	F(minimized, SDL_WINDOW_MINIMIZED) \
	F(maximized, SDL_WINDOW_MAXIMIZED) \
	F(input_grabbed, SDL_WINDOW_INPUT_GRABBED) \
	F(input_focus, SDL_WINDOW_INPUT_FOCUS) \
	F(mouse_focus, SDL_WINDOW_MOUSE_FOCUS) \
	F(fullscreen_desktop, SDL_WINDOW_FULLSCREEN_DESKTOP) \
	F(foreign, SDL_WINDOW_FOREIGN) \
	F(allow_high_dpi, SDL_WINDOW_ALLOW_HIGHDPI) \
	F(mouse_capture, SDL_WINDOW_MOUSE_CAPTURE) \
	F(always_on_top, SDL_WINDOW_ALWAYS_ON_TOP) \
	F(skip_taskbar, SDL_WINDOW_SKIP_TASKBAR) \
	F(utility, SDL_WINDOW_UTILITY) \
	F(tooltip, SDL_WINDOW_TOOLTIP) \
	F(popup_menu, SDL_WINDOW_POPUP_MENU) \
	F(vulkan, SDL_WINDOW_VULKAN)

static NIF_LIST_TO_FLAGS_FUNCTION(list_to_window_flags, Uint32, WINDOW_FLAGS)
static NIF_FLAGS_TO_LIST_FUNCTION(window_flags_to_list, Uint32, WINDOW_FLAGS)

#define WINDOW_POS_ENUM(E) \
	E(centered, SDL_WINDOWPOS_CENTERED) \
	E(undefined, SDL_WINDOWPOS_UNDEFINED)

static NIF_ATOM_TO_ENUM_FUNCTION(atom_to_window_pos, int, WINDOW_POS_ENUM)

#define WINDOW_EVENT_ENUM(E) \
	E(shown, SDL_WINDOWEVENT_SHOWN) \
	E(hidden, SDL_WINDOWEVENT_HIDDEN) \
	E(exposed, SDL_WINDOWEVENT_EXPOSED) \
	E(moved, SDL_WINDOWEVENT_MOVED) \
	E(resized, SDL_WINDOWEVENT_RESIZED) \
	E(size_changed, SDL_WINDOWEVENT_SIZE_CHANGED) \
	E(minimized, SDL_WINDOWEVENT_MINIMIZED) \
	E(maximized, SDL_WINDOWEVENT_MAXIMIZED) \
	E(restored, SDL_WINDOWEVENT_RESTORED) \
	E(enter, SDL_WINDOWEVENT_ENTER) \
	E(leave, SDL_WINDOWEVENT_LEAVE) \
	E(focus_gained, SDL_WINDOWEVENT_FOCUS_GAINED) \
	E(focus_lost, SDL_WINDOWEVENT_FOCUS_LOST) \
	E(close, SDL_WINDOWEVENT_CLOSE) \
	E(take_focus, SDL_WINDOWEVENT_TAKE_FOCUS) \
	E(hit_test, SDL_WINDOWEVENT_HIT_TEST)

NIF_ENUM_TO_ATOM_FUNCTION(window_event_to_atom, Uint8, WINDOW_EVENT_ENUM)

#define WINDOW_FULLSCREEN_ENUM(E) \
	E(fullscreen, SDL_WINDOW_FULLSCREEN) \
	E(fullscreen_desktop, SDL_WINDOW_FULLSCREEN_DESKTOP) \
	E(windowed, 0)

static NIF_ATOM_TO_ENUM_FUNCTION(atom_to_window_fullscreen, Uint32, WINDOW_FULLSCREEN_ENUM)

#define HIT_TEST_ENUM(E) \
	E(normal, SDL_HITTEST_NORMAL) \
	E(draggable, SDL_HITTEST_DRAGGABLE) \
	E(top_left, SDL_HITTEST_RESIZE_TOPLEFT) \
	E(top, SDL_HITTEST_RESIZE_TOP) \
	E(top_right, SDL_HITTEST_RESIZE_TOPRIGHT) \
	E(right, SDL_HITTEST_RESIZE_RIGHT) \
	E(bottom_right, SDL_HITTEST_RESIZE_BOTTOMRIGHT) \
	E(bottom, SDL_HITTEST_RESIZE_BOTTOM) \
	E(bottom_left, SDL_HITTEST_RESIZE_BOTTOMLEFT) \
	E(left, SDL_HITTEST_RESIZE_LEFT)

static NIF_ATOM_TO_ENUM_FUNCTION(atom_to_hit_test_result, SDL_HitTestResult, HIT_TEST_ENUM)

// create_window

NIF_CALL_HANDLER(thread_create_window)
{
	SDL_Window* window;
	obj_Window* res;
	ERL_NIF_TERM term;

	window = SDL_CreateWindow(args[0], (long)args[1], (long)args[2], (long)args[3], (long)args[4], (long)args[5]);

	enif_free(args[0]);

	if (!window)
		return sdl_error_tuple(env);

	NIF_RES_TO_PTR_AND_TERM(Window, window, res, term);

	esdl2_windows_insert(window, res);

	return enif_make_tuple2(env,
		atom_ok,
		term
	);
}

NIF_FUNCTION(create_window)
{
	ErlNifBinary bin;
	char* title;
	int x, y, w, h;
	Uint32 flags = 0;

	if (enif_is_atom(env, argv[1])) {
		BADARG_IF(!atom_to_window_pos(env, argv[1], &x));
	} else {
		BADARG_IF(!enif_get_int(env, argv[1], &x));
	}

	if (enif_is_atom(env, argv[2])) {
		BADARG_IF(!atom_to_window_pos(env, argv[2], &y));
	} else {
		BADARG_IF(!enif_get_int(env, argv[2], &y));
	}

	BADARG_IF(!enif_get_int(env, argv[3], &w));
	BADARG_IF(!enif_get_int(env, argv[4], &h));
	BADARG_IF(!list_to_window_flags(env, argv[5], &flags));

	// Getting the title last to simplify the code due to memory allocation.

	BADARG_IF(!enif_inspect_binary(env, argv[0], &bin));

	title = enif_alloc(bin.size + 1);
	memcpy(title, bin.data, bin.size);
	title[bin.size] = '\0';

	return nif_thread_call(env, thread_create_window, 6,
		title, x, y, w, h, flags);
}

// create_window_and_renderer

NIF_CALL_HANDLER(thread_create_window_and_renderer)
{
	SDL_Window* window;
	SDL_Renderer* renderer;
	ERL_NIF_TERM wterm, rterm;

	if (0 != SDL_CreateWindowAndRenderer((long)args[0], (long)args[1], (long)args[2], &window, &renderer))
		return sdl_error_tuple(env);

	NIF_RES_TO_TERM(Window, window, wterm);
	NIF_RES_TO_TERM(Renderer, renderer, rterm);

	return enif_make_tuple3(env,
		atom_ok,
		wterm,
		rterm
	);
}

NIF_FUNCTION(create_window_and_renderer)
{
	int w, h;
	Uint32 flags = 0;

	BADARG_IF(!enif_get_int(env, argv[0], &w));
	BADARG_IF(!enif_get_int(env, argv[1], &h));
	BADARG_IF(!list_to_window_flags(env, argv[2], &flags));

	return nif_thread_call(env, thread_create_window_and_renderer, 3,
		w, h, flags);
}

// get_grabbed_window

NIF_CALL_HANDLER(thread_get_grabbed_window)
{
	SDL_Window* window;

	window = SDL_GetGrabbedWindow();

	if (!window)
		return atom_undefined;

	return esdl2_windows_find(env, window);
}

NIF_FUNCTION(get_grabbed_window)
{
	return nif_thread_call(env, thread_get_grabbed_window, 0);
}

// get_window_borders_size

NIF_CALL_HANDLER(thread_get_window_borders_size)
{
	int top, left, bottom, right;
	ERL_NIF_TERM map;

	if (SDL_GetWindowBordersSize(args[0], &top, &left, &bottom, &right))
		return atom_undefined;

	map = enif_make_new_map(env);

	enif_make_map_put(env, map, atom_top,
		enif_make_int(env, top), &map);
	enif_make_map_put(env, map, atom_left,
		enif_make_int(env, left), &map);
	enif_make_map_put(env, map, atom_bottom,
		enif_make_int(env, bottom), &map);
	enif_make_map_put(env, map, atom_right,
		enif_make_int(env, right), &map);

	return map;
}

NIF_FUNCTION(get_window_borders_size)
{
	void* window_res;

	BADARG_IF(!enif_get_resource(env, argv[0], res_Window, &window_res));

	return nif_thread_call(env, thread_get_window_borders_size, 1,
		NIF_RES_GET(Window, window_res));
}

// get_window_brightness

NIF_CALL_HANDLER(thread_get_window_brightness)
{
	return enif_make_double(env, SDL_GetWindowBrightness(args[0]));
}

NIF_FUNCTION(get_window_brightness)
{
	void* window_res;

	BADARG_IF(!enif_get_resource(env, argv[0], res_Window, &window_res));

	return nif_thread_call(env, thread_get_window_brightness, 1,
		NIF_RES_GET(Window, window_res));
}

// get_window_display_index

NIF_CALL_HANDLER(thread_get_window_display_index)
{
	int i = SDL_GetWindowDisplayIndex(args[0]);

	if (i < 0)
		return sdl_error_tuple(env);

	return enif_make_tuple2(env,
		atom_ok,
		enif_make_int(env, i)
	);
}

NIF_FUNCTION(get_window_display_index)
{
	void* window_res;

	BADARG_IF(!enif_get_resource(env, argv[0], res_Window, &window_res));

	return nif_thread_call(env, thread_get_window_display_index, 1,
		NIF_RES_GET(Window, window_res));
}

// get_window_display_mode

NIF_CALL_HANDLER(thread_get_window_display_mode)
{
	SDL_DisplayMode mode;

	if (SDL_GetWindowDisplayMode(args[0], &mode))
		return sdl_error_tuple(env);

	return enif_make_tuple2(env,
		atom_ok,
		display_mode_to_map(env, &mode)
	);
}

NIF_FUNCTION(get_window_display_mode)
{
	void* window_res;

	BADARG_IF(!enif_get_resource(env, argv[0], res_Window, &window_res));

	return nif_thread_call(env, thread_get_window_display_mode, 1,
		NIF_RES_GET(Window, window_res));
}

// get_window_flags

NIF_CALL_HANDLER(thread_get_window_flags)
{
	return window_flags_to_list(env, SDL_GetWindowFlags(args[0]));
}

NIF_FUNCTION(get_window_flags)
{
	void* window_res;

	BADARG_IF(!enif_get_resource(env, argv[0], res_Window, &window_res));

	return nif_thread_call(env, thread_get_window_flags, 1,
		NIF_RES_GET(Window, window_res));
}

// get_window_from_id

NIF_CALL_HANDLER(thread_get_window_from_id)
{
	SDL_Window* window;

	window = SDL_GetWindowFromID((long)args[0]);

	if (!window)
		return atom_undefined;

	return esdl2_windows_find(env, window);
}

NIF_FUNCTION(get_window_from_id)
{
	Uint32 windowID;

	BADARG_IF(!enif_get_uint(env, argv[0], &windowID));

	return nif_thread_call(env, thread_get_window_from_id, 1, windowID);
}

// get_window_gamma_ramp

NIF_CALL_HANDLER(thread_get_window_gamma_ramp)
{
	Uint16 gamma[256 * 3];
	ERL_NIF_TERM list[3];
	int i, j;

	if (SDL_GetWindowGammaRamp(args[0], gamma, gamma + 256, gamma + 512))
		return sdl_error_tuple(env);

	for (i = 0; i < 3; i++) {
		list[i] = enif_make_list(env, 0);
		for (j = 255; j >= 0; j--) {
			list[i] = enif_make_list_cell(env,
				enif_make_uint(env, gamma[i * 256 + j]),
				list[i]);
		}
	}

	return enif_make_tuple3(env, list[0], list[1], list[2]);
}

NIF_FUNCTION(get_window_gamma_ramp)
{
	void* window_res;

	BADARG_IF(!enif_get_resource(env, argv[0], res_Window, &window_res));

	return nif_thread_call(env, thread_get_window_gamma_ramp, 1,
		NIF_RES_GET(Window, window_res));
}

// get_window_grab

NIF_CALL_HANDLER(thread_get_window_grab)
{
	if (SDL_GetWindowGrab(args[0]))
		return atom_true;

	return atom_false;
}

NIF_FUNCTION(get_window_grab)
{
	void* window_res;

	BADARG_IF(!enif_get_resource(env, argv[0], res_Window, &window_res));

	return nif_thread_call(env, thread_get_window_grab, 1,
		NIF_RES_GET(Window, window_res));
}

// get_window_id

NIF_CALL_HANDLER(thread_get_window_id)
{
	return enif_make_uint(env, SDL_GetWindowID(args[0]));
}

NIF_FUNCTION(get_window_id)
{
	void* window_res;

	BADARG_IF(!enif_get_resource(env, argv[0], res_Window, &window_res));

	return nif_thread_call(env, thread_get_window_id, 1,
		NIF_RES_GET(Window, window_res));
}

// get_window_maximum_size

NIF_CALL_HANDLER(thread_get_window_maximum_size)
{
	int w, h;

	SDL_GetWindowMaximumSize(args[0], &w, &h);

	return enif_make_tuple2(env,
		enif_make_int(env, w),
		enif_make_int(env, h)
	);
}

NIF_FUNCTION(get_window_maximum_size)
{
	void* window_res;

	BADARG_IF(!enif_get_resource(env, argv[0], res_Window, &window_res));

	return nif_thread_call(env, thread_get_window_maximum_size, 1,
		NIF_RES_GET(Window, window_res));
}

// get_window_minimum_size

NIF_CALL_HANDLER(thread_get_window_minimum_size)
{
	int w, h;

	SDL_GetWindowMinimumSize(args[0], &w, &h);

	return enif_make_tuple2(env,
		enif_make_int(env, w),
		enif_make_int(env, h)
	);
}

NIF_FUNCTION(get_window_minimum_size)
{
	void* window_res;

	BADARG_IF(!enif_get_resource(env, argv[0], res_Window, &window_res));

	return nif_thread_call(env, thread_get_window_minimum_size, 1,
		NIF_RES_GET(Window, window_res));
}

// get_window_opacity

NIF_CALL_HANDLER(thread_get_window_opacity)
{
	float opacity;

	if (SDL_GetWindowOpacity(args[0], &opacity))
		return sdl_error_tuple(env);

	return enif_make_tuple2(env,
		atom_ok,
		enif_make_double(env, opacity)
	);
}

NIF_FUNCTION(get_window_opacity)
{
	void* window_res;

	BADARG_IF(!enif_get_resource(env, argv[0], res_Window, &window_res));

	return nif_thread_call(env, thread_get_window_opacity, 1,
		NIF_RES_GET(Window, window_res));
}

// get_window_pixel_format

NIF_CALL_HANDLER(thread_get_window_pixel_format)
{
	Uint32 format;

	format = SDL_GetWindowPixelFormat(args[0]);

	return pixel_format_to_atom(format);
}

NIF_FUNCTION(get_window_pixel_format)
{
	void* window_res;

	BADARG_IF(!enif_get_resource(env, argv[0], res_Window, &window_res));

	return nif_thread_call(env, thread_get_window_pixel_format, 1,
		NIF_RES_GET(Window, window_res));
}

// get_window_position

NIF_CALL_HANDLER(thread_get_window_position)
{
	int x, y;

	SDL_GetWindowPosition(args[0], &x, &y);

	return enif_make_tuple2(env,
		enif_make_int(env, x),
		enif_make_int(env, y)
	);
}

NIF_FUNCTION(get_window_position)
{
	void* window_res;

	BADARG_IF(!enif_get_resource(env, argv[0], res_Window, &window_res));

	return nif_thread_call(env, thread_get_window_position, 1,
		NIF_RES_GET(Window, window_res));
}

// get_window_size

NIF_CALL_HANDLER(thread_get_window_size)
{
	int w, h;

	SDL_GetWindowSize(args[0], &w, &h);

	return enif_make_tuple2(env,
		enif_make_int(env, w),
		enif_make_int(env, h)
	);
}

NIF_FUNCTION(get_window_size)
{
	void* window_res;

	BADARG_IF(!enif_get_resource(env, argv[0], res_Window, &window_res));

	return nif_thread_call(env, thread_get_window_size, 1,
		NIF_RES_GET(Window, window_res));
}

// get_window_title

NIF_CALL_HANDLER(thread_get_window_title)
{
	ErlNifBinary bin;
	const char* title;

	title = SDL_GetWindowTitle(args[0]);

	if (!title)
		return sdl_error_tuple(env);

	enif_alloc_binary(strlen(title), &bin);
	memcpy(bin.data, title, bin.size);

	return enif_make_binary(env, &bin);
}

NIF_FUNCTION(get_window_title)
{
	void* window_res;

	BADARG_IF(!enif_get_resource(env, argv[0], res_Window, &window_res));

	return nif_thread_call(env, thread_get_window_title, 1,
		NIF_RES_GET(Window, window_res));
}

// hide_window

NIF_CAST_HANDLER(thread_hide_window)
{
	SDL_HideWindow(args[0]);
}

NIF_FUNCTION(hide_window)
{
	void* window_res;

	BADARG_IF(!enif_get_resource(env, argv[0], res_Window, &window_res));

	return nif_thread_cast(env, thread_hide_window, 1,
		NIF_RES_GET(Window, window_res));
}

// maximize_window

NIF_CAST_HANDLER(thread_maximize_window)
{
	SDL_MaximizeWindow(args[0]);
}

NIF_FUNCTION(maximize_window)
{
	void* window_res;

	BADARG_IF(!enif_get_resource(env, argv[0], res_Window, &window_res));

	return nif_thread_cast(env, thread_maximize_window, 1,
		NIF_RES_GET(Window, window_res));
}

// minimize_window

NIF_CAST_HANDLER(thread_minimize_window)
{
	SDL_MinimizeWindow(args[0]);
}

NIF_FUNCTION(minimize_window)
{
	void* window_res;

	BADARG_IF(!enif_get_resource(env, argv[0], res_Window, &window_res));

	return nif_thread_cast(env, thread_minimize_window, 1,
		NIF_RES_GET(Window, window_res));
}

// raise_window

NIF_CAST_HANDLER(thread_raise_window)
{
	SDL_RaiseWindow(args[0]);
}

NIF_FUNCTION(raise_window)
{
	void* window_res;

	BADARG_IF(!enif_get_resource(env, argv[0], res_Window, &window_res));

	return nif_thread_cast(env, thread_raise_window, 1,
		NIF_RES_GET(Window, window_res));
}

// restore_window

NIF_CAST_HANDLER(thread_restore_window)
{
	SDL_RestoreWindow(args[0]);
}

NIF_FUNCTION(restore_window)
{
	void* window_res;

	BADARG_IF(!enif_get_resource(env, argv[0], res_Window, &window_res));

	return nif_thread_cast(env, thread_restore_window, 1,
		NIF_RES_GET(Window, window_res));
}

// set_window_bordered

NIF_CAST_HANDLER(thread_set_window_bordered)
{
	SDL_SetWindowBordered(args[0], (long)args[1]);
}

NIF_FUNCTION(set_window_bordered)
{
	void* window_res;
	SDL_bool b;

	BADARG_IF(!enif_get_resource(env, argv[0], res_Window, &window_res));
	BADARG_IF(!atom_to_bool(env, argv[1], &b));

	return nif_thread_cast(env, thread_set_window_bordered, 2,
		NIF_RES_GET(Window, window_res), b);
}

// set_window_brightness

NIF_CALL_HANDLER(thread_set_window_brightness)
{
	int ret = SDL_SetWindowBrightness(args[0], *((double*)args[1]));

	enif_free(args[1]);

	if (ret != 0)
		return sdl_error_tuple(env);

	return atom_ok;
}

NIF_FUNCTION(set_window_brightness)
{
	void* window_res;
	double *brightnessPtr;

	BADARG_IF(!enif_get_resource(env, argv[0], res_Window, &window_res));

	brightnessPtr = (double*)enif_alloc(sizeof(double));
	if (!enif_get_double(env, argv[1], brightnessPtr)) {
		enif_free(brightnessPtr);
		return enif_make_badarg(env);
	}

	return nif_thread_call(env, thread_set_window_brightness, 2,
		NIF_RES_GET(Window, window_res), brightnessPtr);
}

// set_window_display_mode

NIF_CALL_HANDLER(thread_set_window_display_mode)
{
	SDL_DisplayMode mode;

	mode.format = (long)args[1];
	mode.w = (long)args[2];
	mode.h = (long)args[3];
	mode.refresh_rate = (long)args[4];
	mode.driverdata = NULL;

	if (SDL_SetWindowDisplayMode(args[0], &mode))
		return sdl_error_tuple(env);

	return atom_ok;
}

NIF_FUNCTION(set_window_display_mode)
{
	void* window_res;
	ERL_NIF_TERM term;
	Uint32 format;
	int w, h, refresh_rate;

	BADARG_IF(!enif_get_resource(env, argv[0], res_Window, &window_res));
	BADARG_IF(!enif_get_map_value(env, argv[1], atom_format, &term));
	BADARG_IF(!atom_to_pixel_format(env, term, &format));
	BADARG_IF(!enif_get_map_value(env, argv[1], atom_w, &term));
	BADARG_IF(!enif_get_int(env, term, &w));
	BADARG_IF(!enif_get_map_value(env, argv[1], atom_h, &term));
	BADARG_IF(!enif_get_int(env, term, &h));
	BADARG_IF(!enif_get_map_value(env, argv[1], atom_refresh_rate, &term));
	BADARG_IF(!enif_get_int(env, term, &refresh_rate));

	return nif_thread_call(env, thread_set_window_display_mode, 5,
		NIF_RES_GET(Window, window_res), format, w, h, refresh_rate);
}

// set_window_fullscreen

NIF_CALL_HANDLER(thread_set_window_fullscreen)
{
	if (SDL_SetWindowFullscreen(args[0], (long)args[1]))
		return sdl_error_tuple(env);

	return atom_ok;
}

NIF_FUNCTION(set_window_fullscreen)
{
	void* window_res;
	Uint32 flags;

	BADARG_IF(!enif_get_resource(env, argv[0], res_Window, &window_res));
	BADARG_IF(!atom_to_window_fullscreen(env, argv[1], &flags));

	return nif_thread_call(env, thread_set_window_fullscreen, 2,
		NIF_RES_GET(Window, window_res), flags);
}

// set_window_gamma_ramp

NIF_CALL_HANDLER(thread_set_window_gamma_ramp)
{
	int ret = SDL_SetWindowGammaRamp(args[0], args[1],
		((Uint16*)args[1]) + 256,
		((Uint16*)args[1]) + 512);

	enif_free(args[1]);

	if (ret != 0)
		return sdl_error_tuple(env);

	return atom_ok;
}

NIF_FUNCTION(set_window_gamma_ramp)
{
	void* window_res;
	Uint16 *gamma;
	ERL_NIF_TERM list, head;
	int i, j;
	unsigned int value;

	BADARG_IF(!enif_get_resource(env, argv[0], res_Window, &window_res));

	gamma = enif_alloc(sizeof(Uint16) * 256 * 3);

	for (i = 0; i < 3; i++) {
		list = argv[i + 1];

		for (j = 0; j < 256; j++) {
			if (!enif_get_list_cell(env, list, &head, &list))
				goto set_window_gamma_ramp_badarg;

			if (!enif_get_uint(env, head, &value))
				goto set_window_gamma_ramp_badarg;

			if (value > 65535)
				goto set_window_gamma_ramp_badarg;

			gamma[i * 256 + j] = value;
		}
	}

	return nif_thread_call(env, thread_set_window_gamma_ramp, 2,
		NIF_RES_GET(Window, window_res), gamma);

set_window_gamma_ramp_badarg:
	enif_free(gamma);

	return enif_make_badarg(env);
}

// set_window_grab

NIF_CAST_HANDLER(thread_set_window_grab)
{
	SDL_SetWindowGrab(args[0], (long)args[1]);
}

NIF_FUNCTION(set_window_grab)
{
	void* window_res;
	SDL_bool b;

	BADARG_IF(!enif_get_resource(env, argv[0], res_Window, &window_res));
	BADARG_IF(!atom_to_bool(env, argv[1], &b));

	return nif_thread_cast(env, thread_set_window_grab, 2,
		NIF_RES_GET(Window, window_res), b);
}

// set_window_hit_test

#define WAIT_FOR_RESULT -1
#define NO_RESULT -2

typedef struct hit_test_callback_data {
	char module[256];
	char function[256];
	ErlNifMutex* lock;
	ErlNifCond* cond;
	int result; /* SDL_HitTestResult | WAIT_FOR_RESULT | NO_RESULT */
} hit_test_callback_data;

static SDL_HitTestResult hit_test_callback(SDL_Window* window, const SDL_Point* area, void* data)
{
	ERL_NIF_TERM module, function, window_term;
	int result;
	ErlNifEnv* env = enif_alloc_env();
	hit_test_callback_data* callback = SDL_GetWindowData(window, "hit_test_callback");

	enif_mutex_lock(callback->lock);

	module = enif_make_atom(env, callback->module);
	function = enif_make_atom(env, callback->function);

	callback->result = WAIT_FOR_RESULT;

	window_term = esdl2_windows_find(env, window);

	// Tell our Erlang process to execute the callback.

	enif_send(NULL, get_callback_process(), env,
		enif_make_tuple6(env, atom_callback,
			module,
			function,
			enif_make_list2(env, window_term, point_to_map(env, area)),
			atom_set_window_hit_test_result,
			enif_make_list1(env, window_term)
	));

	enif_free_env(env);

	// Then wait for the result.

	while (callback->result == WAIT_FOR_RESULT)
		enif_cond_wait(callback->cond, callback->lock);

	result = callback->result;
	callback->result = NO_RESULT;

	enif_mutex_unlock(callback->lock);

	return result;
}

NIF_CALL_HANDLER(thread_set_window_hit_test)
{
	hit_test_callback_data* callback = SDL_GetWindowData(args[0], "hit_test_callback");

	// We need to copy the module/function because atoms are theoretically
	// dependent on an environment. This is not the case today but might change.

	if (callback) {
		// We already have an SDL2 window hit test callback.
		// Just update the Erlang module/function we need to call.

		enif_mutex_lock(callback->lock);

		strcpy(callback->module, args[1]),
		strcpy(callback->function, args[2]),

		enif_mutex_unlock(callback->lock);
	} else {
		// This is the first time this function is called. We need
		// to create the initial callback along with its lock/cond.

		callback = (hit_test_callback_data*)SDL_malloc(sizeof(hit_test_callback_data));

		strcpy(callback->module, args[1]),
		strcpy(callback->function, args[2]),

		callback->lock = enif_mutex_create("hit_test_callback_lock");
		callback->cond = enif_cond_create("hit_test_callback_cond");
		callback->result = NO_RESULT;

		SDL_SetWindowData(args[0], "hit_test_callback", callback);
	}

	enif_free(args[1]);
	enif_free(args[2]);

	if (SDL_SetWindowHitTest(args[0], &hit_test_callback, NULL)) {
		SDL_SetWindowData(args[0], "hit_test_callback", NULL);
		SDL_free(callback);

		return sdl_error_tuple(env);
	}

	return atom_ok;
}

NIF_FUNCTION(set_window_hit_test)
{
	void* window_res;
	unsigned int module_len, function_len;
	char *module, *function;

	BADARG_IF(!enif_get_resource(env, argv[0], res_Window, &window_res));
	BADARG_IF(!enif_get_atom_length(env, argv[1], &module_len, ERL_NIF_LATIN1));
	BADARG_IF(!enif_get_atom_length(env, argv[2], &function_len, ERL_NIF_LATIN1));

	module = (char*)enif_alloc(module_len + 1);
	if (!enif_get_atom(env, argv[1], module, module_len + 1, ERL_NIF_LATIN1)) {
		enif_free(module);

		return enif_make_badarg(env);
	}

	function = (char*)enif_alloc(function_len + 1);
	if (!enif_get_atom(env, argv[2], function, function_len + 1, ERL_NIF_LATIN1)) {
		enif_free(module);
		enif_free(function);

		return enif_make_badarg(env);
	}

	return nif_thread_call(env, thread_set_window_hit_test, 3,
		NIF_RES_GET(Window, window_res), module, function);
}

// set_window_hit_test_remove

NIF_CALL_HANDLER(thread_set_window_hit_test_remove)
{
	hit_test_callback_data* callback;

	// We execute the function unconditionally even if we know
	// there is no callback set in order to best reproduce the
	// behavior when the feature is unsupported.

	if (SDL_SetWindowHitTest(args[0], NULL, NULL))
		return sdl_error_tuple(env);

	callback = SDL_GetWindowData(args[0], "hit_test_callback");

	if (!callback)
		return atom_ok;

	// The callback we removed but just in case we check that
	// there is no ongoing callback running before freeing memory.

	enif_mutex_lock(callback->lock);

	while (callback->result != NO_RESULT)
		enif_cond_wait(callback->cond, callback->lock);

	enif_mutex_unlock(callback->lock);

	SDL_SetWindowData(args[0], "hit_test_callback", NULL);
	SDL_free(callback);

	return atom_ok;
}

NIF_FUNCTION(set_window_hit_test_remove)
{
	void* window_res;

	BADARG_IF(!enif_get_resource(env, argv[0], res_Window, &window_res));

	return nif_thread_call(env, thread_set_window_hit_test_remove, 1,
		NIF_RES_GET(Window, window_res));
}

// set_window_hit_test_result

NIF_FUNCTION(set_window_hit_test_result)
{
	void* window_res;
	hit_test_callback_data* callback;
	SDL_HitTestResult result;

	BADARG_IF(!enif_get_resource(env, argv[0], res_Window, &window_res));

	callback = SDL_GetWindowData(NIF_RES_GET(Window, window_res), "hit_test_callback");

	enif_mutex_lock(callback->lock);

	if (!atom_to_hit_test_result(env, argv[1], &result)) {
		// An exception occurred inside the callback function or
		// the user returned an invalid value. Not much we can do.
		// Act as if the callback was disabled and make the callback
		// process crash loudly.

		callback->result = SDL_HITTEST_NORMAL;

		enif_cond_signal(callback->cond);
		enif_mutex_unlock(callback->lock);

		return enif_make_badarg(env);
	}

	callback->result = result;

	enif_cond_signal(callback->cond);
	enif_mutex_unlock(callback->lock);

	return atom_ok;
}

// set_window_icon
//
// We use a call here because we need the surface to exist until this call
// succeeds. If we didn't, a race condition might happen where the surface
// is GC before it is used in the main thread.

NIF_CALL_HANDLER(thread_set_window_icon)
{
	SDL_SetWindowIcon(args[0], args[1]);

	return atom_ok;
}

NIF_FUNCTION(set_window_icon)
{
	void* window_res;
	void* surface_res;

	BADARG_IF(!enif_get_resource(env, argv[0], res_Window, &window_res));
	BADARG_IF(!enif_get_resource(env, argv[1], res_Surface, &surface_res));

	return nif_thread_call(env, thread_set_window_icon, 2,
		NIF_RES_GET(Window, window_res), NIF_RES_GET(Surface, surface_res));
}

// set_window_input_focus

NIF_CALL_HANDLER(thread_set_window_input_focus)
{
	if (SDL_SetWindowInputFocus(args[0]))
		return sdl_error_tuple(env);

	return atom_ok;
}

NIF_FUNCTION(set_window_input_focus)
{
	void* window_res;

	BADARG_IF(!enif_get_resource(env, argv[0], res_Window, &window_res));

	return nif_thread_call(env, thread_set_window_input_focus, 1,
		NIF_RES_GET(Window, window_res));
}

// set_window_maximum_size

NIF_CAST_HANDLER(thread_set_window_maximum_size)
{
	SDL_SetWindowMaximumSize(args[0], (long)args[1], (long)args[2]);
}

NIF_FUNCTION(set_window_maximum_size)
{
	void* window_res;
	int w, h;

	BADARG_IF(!enif_get_resource(env, argv[0], res_Window, &window_res));
	BADARG_IF(!enif_get_int(env, argv[1], &w));
	BADARG_IF(!enif_get_int(env, argv[2], &h));

	return nif_thread_cast(env, thread_set_window_maximum_size, 3,
		NIF_RES_GET(Window, window_res), w, h);
}

// set_window_minimum_size

NIF_CAST_HANDLER(thread_set_window_minimum_size)
{
	SDL_SetWindowMinimumSize(args[0], (long)args[1], (long)args[2]);
}

NIF_FUNCTION(set_window_minimum_size)
{
	void* window_res;
	int w, h;

	BADARG_IF(!enif_get_resource(env, argv[0], res_Window, &window_res));
	BADARG_IF(!enif_get_int(env, argv[1], &w));
	BADARG_IF(!enif_get_int(env, argv[2], &h));

	return nif_thread_cast(env, thread_set_window_minimum_size, 3,
		NIF_RES_GET(Window, window_res), w, h);
}

// set_window_modal_for

NIF_CALL_HANDLER(thread_set_window_modal_for)
{
	if (SDL_SetWindowModalFor(args[0], args[1]))
		return sdl_error_tuple(env);

	return atom_ok;
}

NIF_FUNCTION(set_window_modal_for)
{
	void* modal_window_res;
	void* parent_window_res;

	BADARG_IF(!enif_get_resource(env, argv[0], res_Window, &modal_window_res));
	BADARG_IF(!enif_get_resource(env, argv[1], res_Window, &parent_window_res));

	return nif_thread_call(env, thread_set_window_modal_for, 2,
		NIF_RES_GET(Window, modal_window_res),
		NIF_RES_GET(Window, parent_window_res));
}

// set_window_opacity

NIF_CALL_HANDLER(thread_set_window_opacity)
{
	int ret = SDL_SetWindowOpacity(args[0], *((double*)args[1]));

	enif_free(args[1]);

	if (ret != 0)
		return sdl_error_tuple(env);

	return atom_ok;
}

NIF_FUNCTION(set_window_opacity)
{
	void* window_res;
	double *opacityPtr;

	BADARG_IF(!enif_get_resource(env, argv[0], res_Window, &window_res));

	opacityPtr = (double*)enif_alloc(sizeof(double));
	if (!enif_get_double(env, argv[1], opacityPtr)) {
		enif_free(opacityPtr);
		return enif_make_badarg(env);
	}

	return nif_thread_call(env, thread_set_window_opacity, 2,
		NIF_RES_GET(Window, window_res), opacityPtr);
}

// set_window_position

NIF_CAST_HANDLER(thread_set_window_position)
{
	SDL_SetWindowPosition(args[0], (long)args[1], (long)args[2]);
}

NIF_FUNCTION(set_window_position)
{
	void* window_res;
	int x, y;

	BADARG_IF(!enif_get_resource(env, argv[0], res_Window, &window_res));
	BADARG_IF(!enif_get_int(env, argv[1], &x));
	BADARG_IF(!enif_get_int(env, argv[2], &y));

	return nif_thread_cast(env, thread_set_window_position, 3,
		NIF_RES_GET(Window, window_res), x, y);
}

// set_window_resizable

NIF_CAST_HANDLER(thread_set_window_resizable)
{
	SDL_SetWindowResizable(args[0], (long)args[1]);
}

NIF_FUNCTION(set_window_resizable)
{
	void* window_res;
	SDL_bool b;

	BADARG_IF(!enif_get_resource(env, argv[0], res_Window, &window_res));
	BADARG_IF(!atom_to_bool(env, argv[1], &b));

	return nif_thread_cast(env, thread_set_window_resizable, 2,
		NIF_RES_GET(Window, window_res), b);
}

// set_window_size

NIF_CAST_HANDLER(thread_set_window_size)
{
	SDL_SetWindowSize(args[0], (long)args[1], (long)args[2]);
}

NIF_FUNCTION(set_window_size)
{
	void* window_res;
	int w, h;

	BADARG_IF(!enif_get_resource(env, argv[0], res_Window, &window_res));
	BADARG_IF(!enif_get_int(env, argv[1], &w));
	BADARG_IF(!enif_get_int(env, argv[2], &h));

	return nif_thread_cast(env, thread_set_window_size, 3,
		NIF_RES_GET(Window, window_res), w, h);
}

// set_window_title

NIF_CAST_HANDLER(thread_set_window_title)
{
	SDL_SetWindowTitle(args[0], args[1]);

	enif_free(args[1]);
}

NIF_FUNCTION(set_window_title)
{
	void* window_res;
	ErlNifBinary bin;
	char* title;

	BADARG_IF(!enif_get_resource(env, argv[0], res_Window, &window_res));
	BADARG_IF(!enif_inspect_binary(env, argv[1], &bin));

	title = enif_alloc(bin.size + 1);
	memcpy(title, bin.data, bin.size);
	title[bin.size] = '\0';

	return nif_thread_cast(env, thread_set_window_title, 2,
		NIF_RES_GET(Window, window_res), title);
}

// show_window

NIF_CAST_HANDLER(thread_show_window)
{
	SDL_ShowWindow(args[0]);
}

NIF_FUNCTION(show_window)
{
	void* window_res;

	BADARG_IF(!enif_get_resource(env, argv[0], res_Window, &window_res));

	return nif_thread_cast(env, thread_show_window, 1,
		NIF_RES_GET(Window, window_res));
}