import helloserver.*;
import java.awt.*;
import java.awt.event.*;

public class Client{
	//Private Objects - We'll hold a reference to the COM object
	IComHelloServer theServer;
	Frame theWindow;
	Button callComFunction, clear;
	Label serverResponse;
	Panel thePanel;
	ClearDisplay clearAction;
	CallComFunction callCom;
	WindowHandler winEvent;
	int loopThreadID=0;

	
	public static void main(String args[]){
		Client comClient = new Client();
	}

	public Client(){
		com.ms.com.ComLib.declareMessagePumpThread();
		loopThreadID = com.ms.win32.Kernel32.GetCurrentThreadId();
		//Inside the virtual machine this invokes a call to CoCreateInstance
		//starts up the program HelloServer.exe and gives me reference to the interface
		theServer = (IComHelloServer) new ComHelloServer();
		//Give the Server some time to come up
		try{
			Thread.sleep(10);
		}catch(Exception ii) {}
		
		startGUI();	
		//setup a windows message loop for the thread, we want to catch the WM_QUIT message
		com.ms.win32.MSG msg = new com.ms.win32.MSG();
		while (com.ms.win32.User32.GetMessage(msg, 0, 0, 0)) {
			com.ms.win32.User32.TranslateMessage(msg);
			if (msg.message==com.ms.win32.win.WM_QUIT)
				break;
            	com.ms.win32.User32.DispatchMessage(msg);
		}

		//When were done, we release it
		com.ms.com.ComLib.release(theServer);
		//Give the VM some time to release the Server
		try{
			Thread.sleep(1000);
		}catch(Exception ii){}
		System.exit(0);
	}

	void startGUI(){
		theWindow = new Frame("HelloServer Driver");
		//theWindow.setSize(300,300);
		thePanel = new Panel();
		serverResponse = new Label(); //This is where we display the Server's response
		setupButtons();
		setupPanel();
		setupLayout();
		theWindow.setVisible(true);
		winEvent = new WindowHandler(theWindow, loopThreadID);
		theWindow.addWindowListener(winEvent);
	}
	
	void setupButtons(){
		callComFunction = new Button("Call COM Method");
		clear = new Button("Clear Display");
		clearAction = new ClearDisplay(serverResponse, theWindow);
		callCom = new CallComFunction(theServer, serverResponse, theWindow);
		callComFunction.addActionListener(callCom);
		clear.addActionListener(clearAction);
	}

	void setupLayout(){
		theWindow.setLayout(new BorderLayout());
		setupPanel();
		theWindow.add(thePanel, BorderLayout.CENTER);
	}

	void setupPanel(){
		thePanel.setLayout(new GridLayout(0,1));
		thePanel.add(callComFunction);
		thePanel.add(clear);
		thePanel.add(serverResponse);
	}
		
}

class WindowHandler extends WindowAdapter{
	Frame theWindow;
	int threadID;	

	public WindowHandler(Frame theWindow, int threadID){
		this.theWindow = theWindow;
		this.threadID = threadID;
	}

	public void windowClosing(WindowEvent evt){
		theWindow.dispose();
		com.ms.win32.User32.PostThreadMessage(threadID, com.ms.win32.win.WM_QUIT, 0, 0);
	}
}

class CallComFunction implements ActionListener{
	IComHelloServer theServer;
	Frame theWindow;
	Label serverResponse;

	public CallComFunction(IComHelloServer theServer, Label serverResponse, Frame theWindow){
		this.theServer = theServer;
		this.theWindow = theWindow;
		this.serverResponse = serverResponse;
	}

	public void actionPerformed(ActionEvent evt){
		String response = theServer.HelloWorld(); //Make a call on the COM interface
		serverResponse.setText(response);
		theWindow.validate(); //Let's redo the layout to catch the update	
	}
}

class ClearDisplay implements ActionListener{
	Frame theWindow;
	Label serverResponse;

	public ClearDisplay(Label serverResponse, Frame theWindow){
		this.theWindow = theWindow;
		this.serverResponse = serverResponse;
	}
	
	public void actionPerformed(ActionEvent evt){
		serverResponse.setText(""); //Clear the display box
		theWindow.validate(); //Let's redo the layout to catch the update
	}
}