/*******************************************************************************
 * Copyright (c) 2000, 2017 IBM Corporation and others.
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 * 
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.dltk.debug.ui.display.internal;

import java.util.List;

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.dltk.debug.ui.display.IEvaluateConsole;
import org.eclipse.dltk.debug.ui.display.IEvaluateConsoleListener;
import org.eclipse.dltk.debug.ui.display.ScriptDisplayView;
import org.eclipse.jface.action.Action;
import org.eclipse.jface.action.ActionContributionItem;
import org.eclipse.jface.action.IMenuCreator;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Menu;
import org.eclipse.ui.console.IConsole;
import org.eclipse.ui.console.IConsoleConstants;
import org.eclipse.ui.internal.console.ConsolePluginImages;
import org.eclipse.ui.internal.console.ShowConsoleAction;
import org.eclipse.ui.progress.UIJob;
import org.eclipse.ui.texteditor.IUpdate;

/**
 * Drop down action in the console to select the console to display.
 */
public class ConsoleDropDownAction extends Action
		implements IMenuCreator, IEvaluateConsoleListener, IUpdate {

	private ScriptDisplayView fView;
	private Menu fMenu;

	@Override
	public void update() {
		setEnabled(fView.getConsoles().length > 1);
	}

	public ConsoleDropDownAction(ScriptDisplayView view) {
		fView = view;
		setText(ConsoleMessages.ConsoleDropDownAction_0);
		setToolTipText(ConsoleMessages.ConsoleDropDownAction_1);
		setImageDescriptor(ConsolePluginImages
				.getImageDescriptor(IConsoleConstants.IMG_VIEW_CONSOLE));
		// PlatformUI.getWorkbench().getHelpSystem().setHelp(this,
		// IConsoleHelpContextIds.CONSOLE_DISPLAY_CONSOLE_ACTION);
		setMenuCreator(this);
		fView.addConsoleListener(this);
		update();
	}

	@Override
	public void dispose() {
		if (fMenu != null) {
			fMenu.dispose();
		}

		fView = null;
		// ConsolePlugin.getDefault().getConsoleManager()
		// .removeConsoleListener(this);
	}

	@Override
	public Menu getMenu(Menu parent) {
		return null;
	}

	@Override
	public Menu getMenu(Control parent) {
		if (fMenu != null) {
			fMenu.dispose();
		}

		fMenu = new Menu(parent);
		IConsole[] consoles = fView.getConsoles();
		IConsole current = fView.getConsole();
		for (int i = 0; i < consoles.length; i++) {
			IConsole console = consoles[i];
			Action action = new ShowConsoleAction(fView, console);
			action.setChecked(console.equals(current));
			addActionToMenu(fMenu, action, i + 1);
		}
		return fMenu;
	}

	private void addActionToMenu(Menu parent, Action action, int accelerator) {
		if (accelerator < 10) {
			StringBuffer label = new StringBuffer();
			// add the numerical accelerator
			label.append('&');
			label.append(accelerator);
			label.append(' ');
			label.append(action.getText());
			action.setText(label.toString());
		}
		ActionContributionItem item = new ActionContributionItem(action);
		item.fill(parent, -1);
	}

	@Override
	public void run() {
		boolean pinned = fView.isPinned();
		if (pinned) {
			fView.setPinned(false);
		}
		List<IConsole> stack = fView.getConsoleStack();
		if (stack.size() > 1) {
			IConsole console = stack.get(1);
			fView.display(console);
		}
		if (pinned) {
			fView.setPinned(true);
		}
	}

	@Override
	public void consoleAdded(IEvaluateConsole console) {
		UIJob job = new UIJob("") { //$NON-NLS-1$
			@Override
			public IStatus runInUIThread(IProgressMonitor monitor) {
				update();
				return Status.OK_STATUS;
			}
		};
		job.setSystem(true);
		job.setPriority(Job.INTERACTIVE);
		job.schedule();
	}

	/*
	 * (non-Javadoc)
	 *
	 * Dispose the menu when a launch is removed, such that the actions in this
	 * menu do not hang on to associated resources.
	 *
	 * @see
	 * org.eclipse.ui.console.IConsoleListener#consolesRemoved(org.eclipse.ui
	 * .console.IConsole[])
	 */
	public void consolesRemoved(IConsole[] consoles) {
		UIJob job = new UIJob("") { //$NON-NLS-1$
			@Override
			public IStatus runInUIThread(IProgressMonitor monitor) {
				if (fMenu != null) {
					fMenu.dispose();
				}
				update();
				return Status.OK_STATUS;
			}
		};
		job.setSystem(true);
		job.setPriority(Job.INTERACTIVE);
		job.schedule();
	}
}