use fmt;
use sdl2;

export fn main() void = {
	sdl2::SDL_Init(sdl2::SDL_INIT_VIDEO)!;
	defer sdl2::SDL_Quit();

	fmt::println(size(i32), size(i64), size(int), size(size))!;


	const win = sdl2::SDL_CreateWindow("hi", sdl2::SDL_WINDOWPOS_UNDEFINED, sdl2::SDL_WINDOWPOS_UNDEFINED, 640, 480, sdl2::SDL_WindowFlags::NONE)!;
	defer sdl2::SDL_DestroyWindow(win);

	const wsurf = sdl2::SDL_GetWindowSurface(win)!;
	const format = wsurf.format;
	assert(format.bytesperpixel == 4, "can only work with u32 pixels");
	fmt::printfln("got format {}. bytes per pixel {}. r{:x} g{:x} b{:x} a{:x}",
		format.format, format.bytesperpixel, format.rmask, format.gmask, format.bmask, format.amask)!;
	fmt::printfln("red: {:x} green {:x} blue {:x}",
		sdl2::SDL_MapRGB(format, 255, 0, 0),
		sdl2::SDL_MapRGB(format, 0, 255, 0),
		sdl2::SDL_MapRGB(format, 0, 0, 255))!;
	fmt::println(wsurf.w * wsurf.h)!;
	fmt::println(sdl2::SDL_GetPixelFormatName(format.format))!;

	let dstate = drawing_state {
		drawing = false,
		pos = (0,0),
		picture = picture_from_surface(wsurf)
	};


	let quit = false;
	let n = 0z;
	let lasttime = sdl2::SDL_GetTicks();
	for (!quit) {
		let ev = sdl2::event { ... };
		for (sdl2::SDL_PollEvent(&ev)! == 1) switch (ev.event_type) {
			case sdl2::SDL_EventType::QUIT => quit = true;
			case sdl2::SDL_EventType::KEYDOWN =>
				const keysym = ev.key.keysym.sym;
				if (keysym == sdl2::SDL_Keycode::ESCAPE) quit = true;
			case sdl2::SDL_EventType::MOUSEBUTTONDOWN,
					sdl2::SDL_EventType::MOUSEBUTTONUP =>
				const edata = ev.button;
				dstate.pos = (edata.x, edata.y);
				if (edata.button == 1)
					dstate.drawing = (edata.state == 1);
			case sdl2::SDL_EventType::MOUSEMOTION =>
				const edata = ev.motion;
				dstate.pos = (edata.x, edata.y);
			case => void;
		};

		do_drawing(&dstate);


		// if (drawing) {
		// 	circle(pic, mousex, mousey, 5, 0x00ffff);
		// };

		// circle(pic, 100, 100, n:int, 0xff0000);

		sdl2::SDL_UpdateWindowSurface(win)!;
		n += 1;
		sdl2::SDL_Delay(1000/60);

		// if (n % 100 == 0) {
		// 	const thistime = sdl2::SDL_GetTicks();
		// 	const dt = (thistime - lasttime): f64;
		// 	lasttime = thistime;
		// 	const dt = dt / 100.0;
		// 	const fps = 1000.0/dt;
		// 	fmt::printfln("fps: {}",fps)!;
		// };
	};
};