package ie.dcu.apps.ist;

import ie.dcu.plugin.*;
import ie.dcu.segment.Segmenter;

import java.util.logging.Logger;

import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.widgets.*;

/**
 * Application launcher.
 * 
 * @author Kevin McGuinness
 */
public class Main {
	public static final Logger log = Logger.getLogger("Main");
	
	/**
	 * Message to show when GDI+ is not installed.
	 */
	private static final String NO_GDIPLUS = 
		"Unable to load required library: GDI+ (gdiplus.dll)\n\n" +
		"The GDI+ library needs to be installed before this program " +
		"can be used on this platform. See the note at the end of " +
		"the download page for further details.";
		
	
	public static void main(String[] args) {
		System.out.print(Application.DEFAULT_PLUGIN_SEARCH_PATH);
		for (String s: Application.DEFAULT_PLUGIN_SEARCH_PATH) {
			System.out.println(s);
		}
		
		Display.setAppName(Application.APP_NAME);
		check();
		loadPlugins();
		AppWindow window = new AppWindow();
		window.setBlockOnOpen(true);
		window.open();
		System.exit(0);
	}
	
	private static void loadPlugins() {
		PluginManager manager = new PluginManager();
		for (String path : Application.DEFAULT_PLUGIN_SEARCH_PATH) {
			manager.searchPath().add(path);
		}
		manager.loadPlugins();
		for (Plugin plugin : manager.plugins()) {
			String classname = plugin.getMetadata("segmenter");
			if (classname != null) {
				loadSegmenterPlugin(plugin, classname);
			}
		}
	}

	private static void loadSegmenterPlugin(Plugin plugin, String classname) {
		try {
			Segmenter segmenter = (Segmenter) 
				plugin.loadObject(classname);
			
			SegmenterRegistry.getInstance().add(segmenter);
			
		} catch (PluginException e) {
			log.severe("Unable to load plugin: " + e);
		}
	}

	public static boolean contains(String[] args, String argument) {
		for (String arg : args) {
			while (arg.startsWith("-")) {
				arg = arg.substring(1);
			}
			
			if (arg.equals(argument)) {
				return true;
			}
		}
		return false;
	}
	
	private static void check() {
		// Check for potential missing GDI+ on Win2K, NT, ME 98
		String os = System.getProperty("os.name");
		if (os.equals("Windows 2000") ||
			os.equals("Windows NT") ||
			os.equals("Windows ME") ||
			os.equals("Windows 98")) 
		{
			try {
				System.loadLibrary("gdiplus");
			} catch (RuntimeException e) {
				exit(NO_GDIPLUS);
			}
		}
	}
	
	static void exit(String message) {
		Display display = Display.getDefault();
		Rectangle rect = display.getBounds();
		
		Shell shell = display.getActiveShell();
		if (shell == null) {
			shell = new Shell(display, SWT.NO_TRIM);
			shell.setBounds(rect.width/2, rect.height/2, 0, 0);
			shell.open();
			shell.setText("Error");
		}
		
		MessageBox box = new MessageBox(shell, SWT.ICON_ERROR);
		box.setText("Error");
		box.setMessage(message);
		box.open();
		display.dispose();
		System.exit(1);
	}
}