package org.argeo.cms.ui.rcp;

import java.lang.System.Logger;
import java.lang.System.Logger.Level;
import java.net.InetSocketAddress;
import java.nio.file.Path;

import org.argeo.api.cms.CmsApp;
import org.argeo.api.cms.CmsDeployment;
import org.argeo.cms.util.OS;
import org.eclipse.swt.events.DisposeListener;
import org.eclipse.swt.widgets.Display;
import com.sun.net.httpserver.HttpsServer;

/** Creates the SWT {@link Display} in a dedicated thread. */
public class CmsRcpDisplayFactory {
	private final static Logger logger = System.getLogger(CmsRcpDisplayFactory.class.getName());

	/** File name in a run directory */
	private final static String ARGEO_RCP_URL = "argeo.rcp.url";

	/** There is only one display in RCP mode */
	private Display display;

	private CmsUiThread uiThread;

	private boolean shutdown = false;

	private CmsDeployment cmsDeployment;

	public void init() {
		uiThread = new CmsUiThread();
		uiThread.start();
		while (display == null)
			try {
				Thread.sleep(100);
			} catch (InterruptedException e) {
				// silent
			}
	}

	public void destroy() {
		shutdown = true;
		display.wake();
		try {
			uiThread.join();
		} catch (InterruptedException e) {
			// silent
		} finally {
			uiThread = null;
		}
	}

	class CmsUiThread extends Thread {

		public CmsUiThread() {
			super("CMS UI");
		}

		@Override
		public void run() {
			try {
				display = Display.getDefault();
				boolean displayOwner = display.getThread() == this;
				if (displayOwner) {
					display.setRuntimeExceptionHandler((e) -> e.printStackTrace());
					display.setErrorHandler((e) -> e.printStackTrace());

					while (!shutdown) {
						if (!display.readAndDispatch())
							display.sleep();
					}
					display.dispose();
					display = null;
				}
			} catch (UnsatisfiedLinkError e) {
				logger.log(Level.ERROR,
						"Cannot load SWT, either because the SWT DLLs are no in the java.library.path,"
								+ " or because the OSGi framework has been refreshed." + " Restart the application.",
						e);
			}
		}
	}

	@Deprecated
	public Display getDisplay() {
		return display;
	}

	public void openCmsApp(CmsApp cmsApp, String uiName, DisposeListener disposeListener) {
		cmsDeployment.getHttpServer().thenAccept((httpServer) -> {
			getDisplay().syncExec(() -> {
				CmsRcpApp cmsRcpApp = new CmsRcpApp(uiName);
				cmsRcpApp.setCmsApp(cmsApp, null);
				if (httpServer != null) {
					InetSocketAddress addr = httpServer.getAddress();
					String scheme = "http";
					if (httpServer instanceof HttpsServer httpsServer) {
						if (httpsServer.getHttpsConfigurator() != null)
							scheme = "https";
					}
					String httpServerBase = scheme + "://" + addr.getHostString() + ":" + addr.getPort();
					cmsRcpApp.setHttpServerBase(httpServerBase);
				}
				cmsRcpApp.initRcpApp();
				if (disposeListener != null)
					cmsRcpApp.getShell().addDisposeListener(disposeListener);
			});
		});
	}

	public static Path getUrlRunFile() {
		return OS.getRunDir().resolve(CmsRcpDisplayFactory.ARGEO_RCP_URL);
	}

	public void setCmsDeployment(CmsDeployment cmsDeployment) {
		this.cmsDeployment = cmsDeployment;
	}

}