// 26 april 2015
#include "uipriv_windows.h"

#define containerClass L"libui_uiContainerClass"

HWND initialParent;

static LRESULT CALLBACK containerWndProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
	uiContainer *c;
	CREATESTRUCTW *cs = (CREATESTRUCTW *) lParam;

	c = uiContainer(GetWindowLongPtrW(hwnd, GWLP_USERDATA));
	if (c == NULL)
		if (uMsg == WM_NCCREATE)
			SetWindowLongPtrW(hwnd, GWLP_USERDATA, (LONG_PTR) (cs->lpCreateParams));
		// DO NOT RETURN DEFWINDOWPROC() HERE
		// see the next block of comments as to why
		// instead, we simply check if c == NULL again later

	switch (uMsg) {
	// these must always be run, even on the initial parent
	// why? http://blogs.msdn.com/b/oldnewthing/archive/2010/03/16/9979112.aspx
	// TODO
	// these are only run if c is not NULL
	case WM_WINDOWPOSCHANGED:
	case msgUpdateChild:
		if (c == NULL)
			break;
		;	// TODO
	}

	return DefWindowProcW(hwnd, uMsg, wParam, lParam);
}

const char *initContainer(void)
{
	WNDCLASSW wc;

	ZeroMemory(&wc, sizeof (WNDCLASSW));
	wc.lpszClassName = containerClass;
	wc.lpfnWndProc = containerWndProc;
	wc.hInstance = hInstance;
	wc.hIcon = hDefaultIcon;
	wc.hCursor = hDefaultCursor;
	wc.hbrBackground = (HBRUSH) (COLOR_BTNFACE + 1);
	if (RegisterClassW(&wc) == 0)
		return "registering uiContainer window class";

	initialParent = CreateWindowExW(0,
		uiOSContainerClass, L"",
		WS_OVERLAPPEDWINDOW,
		0, 0,
		100, 100,
		NULL, NULL, hInstance, NULL);
	if (initialParent == NULL)
		return "creating initial parent window";

	// just to be safe, disable the initial parent so it can't be interacted with accidentally
	// if this causes issues for our controls, we can remove it
	EnableWindow(initialParent, FALSE);
	return NULL;
}

void uiMakeContainer(uiContainer *c)
{
	// TODO
}