package org.thoughtframe.bridge;

import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
import org.eclipse.core.runtime.jobs.Job;
import org.eclipse.ui.IStartup;
import org.eclipse.ui.IWorkbench;
import org.eclipse.ui.IWorkbenchListener;
import org.eclipse.ui.PlatformUI;

/**
 * Wires engine shutdown to the workbench lifecycle.
 *
 * The engine is lazy by default: booting it starts Jetty and an embedded search
 * node, which is slow and shares its data-directory lock with anything else
 * running (the TUI, another workbench). Nothing in the hello-world capture path
 * needs it. Set -Dthoughtframe.eclipse.autostart=true to boot at startup anyway.
 */
public class ThoughtframeStartup implements IStartup
{
	/** System property: boot the engine as soon as the workbench starts. */
	protected String fieldAutostartProperty = "thoughtframe.eclipse.autostart";

	public String getAutostartProperty()
	{
		return fieldAutostartProperty;
	}

	public void setAutostartProperty(String inProperty)
	{
		fieldAutostartProperty = inProperty;
	}

	public void earlyStartup()
	{
		PlatformUI.getWorkbench().addWorkbenchListener(new IWorkbenchListener()
		{
			public boolean preShutdown(IWorkbench inWorkbench, boolean inForced)
			{
				EngineIsland.getInstance().stop();
				return true;
			}

			public void postShutdown(IWorkbench inWorkbench)
			{
			}
		});

		if (Boolean.getBoolean(getAutostartProperty()))
		{
			scheduleStart();
		}
	}

	/**
	 * Boots the engine on a background job so the UI never blocks. This is the
	 * trigger a later rung calls on demand; the view watches {@code isBooting()}.
	 */
	protected void scheduleStart()
	{
		Job job = new Job("Starting ThoughtFrame engine")
		{
			protected IStatus run(IProgressMonitor inMonitor)
			{
				inMonitor.beginTask("Starting ThoughtFrame engine", IProgressMonitor.UNKNOWN);
				try
				{
					EngineIsland.getInstance().start();
					return Status.OK_STATUS;
				}
				catch (Throwable t)
				{
					EngineIsland.getInstance().setFailure(t);
					return new Status(IStatus.ERROR, Constants.PLUGIN_ID, "ThoughtFrame engine failed to start", t);
				}
				finally
				{
					inMonitor.done();
				}
			}
		};
		job.setUser(false);
		job.schedule();
	}
}