#include <QtWidgets/QApplication>
#include <windows.h>
#include <tchar.h>
#include <qdebug.h>
#include "QWinHost.h"
#include <QtWidgets/QtWidgets>
#include <QWebEngineView>

LRESULT CALLBACK WindowProc(_In_ HWND hwnd, _In_ UINT message, _In_ WPARAM wParam, _In_ LPARAM lParam)
{
	switch (message)
	{
	case WM_PAINT: {

		PAINTSTRUCT ps;
		HDC hdc = BeginPaint(hwnd, &ps);

		RECT r{};
		GetClientRect(hwnd, &r);
		HBRUSH b = CreateSolidBrush(RGB(100, 100, 150));
		FillRect(hdc, &r, b);
		DeleteObject(b);

		SetTextColor(hdc, 0x00000000);
		LPCWSTR message = L"Native Center View";
		DrawText(
			hdc,
			message, -1,
			&r,
			DT_SINGLELINE | DT_CENTER | DT_VCENTER );
		EndPaint(hwnd, &ps);

		return 0;
	}
	case WM_SIZE:
	{
		InvalidateRect(hwnd, nullptr, FALSE);
		break;
	}
	case WM_DESTROY:
	{
		QString msg = "Warning: Native Center View got destroyed!";
		qWarning() << msg;
		break;
	}
	}

	return DefWindowProc(hwnd, message, wParam, lParam);
}

int main( int argc, char *argv[] )
{
	SetDllDirectory(_T(""));
	
	// Register our embedded test window class
	auto hInstance = GetModuleHandle(NULL);
	WNDCLASS wc; 
	wc.style = 0;
	wc.lpfnWndProc = (WNDPROC)WindowProc;
	wc.cbClsExtra = 0;
	wc.cbWndExtra = 0;
	wc.hInstance = hInstance;
	wc.hIcon = LoadIcon((HINSTANCE)NULL, IDI_APPLICATION);
	wc.hCursor = LoadCursor((HINSTANCE)NULL, IDC_ARROW);
	wc.hbrBackground = CreateSolidBrush(RGB(0, 0, 255));
	wc.lpszMenuName = nullptr;
	wc.lpszClassName = L"EmbeddedWindow";

	if (!RegisterClass(&wc))
		return FALSE; 
	
	//---------------------------------------------------------------------
	qputenv("QT_ENABLE_HIGHDPI_SCALING", "0");
	//---------------------------------------------------------------------
	
	QApplication app( argc, argv );
	
	QWinHost* winHost = new QWinHost();

	// Create native win32 window that gets embedded in our QMainWindow's central area
	HWND embededWin = CreateWindow(L"EmbeddedWindow", // Predefined class;
		L"EmbeddedWindow", // caption
		WS_TABSTOP | WS_VISIBLE | WS_CHILD, // Styles
		0, // x position
		0, // y position
		800, // Button width
		600, // Button height
		(HWND)winHost->winId(), // Parent window
		NULL, // No menu.
		hInstance,
		NULL); // Pointer not needed.

	winHost->setWindow(embededWin);

	// Create Top Level MainWindow
	auto mainWindow = new QMainWindow();
	//mainWindow->setWindowTitle(QString("TLW Surface Change on Dock - Qt%1.%2.%3").arg(QT_VERSION_MAJOR).arg(QT_VERSION_MINOR).arg(QT_VERSION_PATCH));
	mainWindow->setCentralWidget(winHost);
	mainWindow->resize(800, 600);
	mainWindow->show();

	// Create dock widget for hosting a web view
	auto dockWidget = new QDockWidget("WebView", mainWindow);
	dockWidget->setAllowedAreas(Qt::AllDockWidgetAreas);
	mainWindow->addDockWidget(Qt::LeftDockWidgetArea, dockWidget);
	dockWidget->setFloating(true);
	dockWidget->show();
	dockWidget->windowHandle()->winId();

	auto webView = new QWebEngineView();
	webView->load(QUrl("https://qt-project.org/"));
	webView->show();
	webView->windowHandle()->winId();
	dockWidget->setWidget(webView);

	auto tlwSurfaceType = mainWindow->windowHandle()->surfaceType();
	qDebug() << "MainWindow surface type:" << tlwSurfaceType;

	QObject::connect(dockWidget, &QDockWidget::topLevelChanged, mainWindow, [mainWindow, tlwSurfaceType]() {
		auto currentSurfaceType = mainWindow->windowHandle()->surfaceType();
		if (tlwSurfaceType != currentSurfaceType)
		{
			qDebug() << "MainWindow surface type changed to :" << currentSurfaceType;
		}
		});

	// Run Qt message loop
	return app.exec();
}