/*******************************************************************************
 * Copyright (c) 2000, 2007 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.update.internal.ui;

import java.util.Hashtable;

import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.jobs.IJobChangeEvent;
import org.eclipse.core.runtime.jobs.IJobChangeListener;
import org.eclipse.core.runtime.jobs.Job;
import org.eclipse.jface.action.Action;
import org.eclipse.jface.action.IAction;
import org.eclipse.jface.action.IMenuManager;
import org.eclipse.jface.action.MenuManager;
import org.eclipse.jface.action.Separator;
import org.eclipse.jface.util.IPropertyChangeListener;
import org.eclipse.jface.util.PropertyChangeEvent;
import org.eclipse.jface.window.ApplicationWindow;
import org.eclipse.osgi.util.NLS;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.update.internal.ui.views.ConfigurationView;
import org.eclipse.update.ui.UpdateJob;

/**
 * Configuration Manager window.
 */
public class ConfigurationManagerWindow extends ApplicationWindow {
	private ConfigurationView view;

	private GlobalAction propertiesAction;

	private IAction propertiesActionHandler;

	private IJobChangeListener jobListener;
	
	private Hashtable jobNames;

	class GlobalAction extends Action implements IPropertyChangeListener {
		private IAction handler;

		public GlobalAction() {
		}

		public void setActionHandler(IAction action) {
			if (handler != null) {
				handler.removePropertyChangeListener(this);
				handler = null;
			}
			if (action != null) {
				this.handler = action;
				action.addPropertyChangeListener(this);
			}
			if (handler != null) {
				setEnabled(handler.isEnabled());
				setChecked(handler.isChecked());
			}
		}

		public void propertyChange(PropertyChangeEvent event) {
			if (event.getProperty().equals(Action.ENABLED)) {
				Boolean bool = (Boolean) event.getNewValue();
				setEnabled(bool.booleanValue());
			} else if (event.getProperty().equals(Action.CHECKED)) {
				Boolean bool = (Boolean) event.getNewValue();
				setChecked(bool.booleanValue());
			}
		}

		public void run() {
			if (handler != null)
				handler.run();
		}
	}

	/**
	 * @param parentShell
	 */
	public ConfigurationManagerWindow(Shell parentShell) {
		super(parentShell);
		setShellStyle(getShellStyle() | SWT.APPLICATION_MODAL);
		// Setup window.
		addMenuBar();
		addActions();
		addToolBar(SWT.FLAT);
		addStatusLine();
	}
	
	public boolean isProgressCanceled() {
		return getStatusLineManager().getProgressMonitor().isCanceled();
	}

	private void addActions() {
		IMenuManager menuBar = getMenuBarManager();
		IMenuManager fileMenu = new MenuManager(
				UpdateUIMessages.ConfigurationManagerWindow_fileMenu);
		menuBar.add(fileMenu);

		propertiesAction = new GlobalAction();
		propertiesAction
				.setText(UpdateUIMessages.ConfigurationManagerWindow_properties);
		propertiesAction.setEnabled(false);

		fileMenu.add(propertiesAction);
		fileMenu.add(new Separator());

		Action closeAction = new Action() {
			public void run() {
				close();
			}
		};
		closeAction.setText(UpdateUIMessages.ConfigurationManagerWindow_close);
		fileMenu.add(closeAction);
	}

	private void hookGlobalActions() {
		if (propertiesActionHandler != null)
			propertiesAction.setActionHandler(propertiesActionHandler);
	}

	protected Control createContents(Composite parent) {
		view = new ConfigurationView(this);
		Composite container = new Composite(parent, SWT.NULL);
		GridLayout layout = new GridLayout();
		layout.marginWidth = layout.marginHeight = 0;
		layout.verticalSpacing = 0;
		container.setLayout(layout);

		addSeparator(container);
		GridData gd;

		view.createPartControl(container);
		Control viewControl = view.getControl();
		gd = new GridData(GridData.FILL_BOTH);
		viewControl.setLayoutData(gd);

		addSeparator(container);

		hookGlobalActions();

		updateActionBars();

		UpdateLabelProvider provider = UpdateUI.getDefault().getLabelProvider();
		getShell().setImage(provider.get(UpdateUIImages.DESC_CONFIGS_VIEW, 0));

		return container;
	}

	public void updateStatusLine(String message, Image image) {
		getStatusLineManager().setMessage(image, message);
		getStatusLineManager().update(true);
	}

	public void trackUpdateJob(Job job, String name) {
		if (jobListener == null) {
			jobNames = new Hashtable();
			jobListener = new IJobChangeListener() {
				public void aboutToRun(IJobChangeEvent event) {
				}

				public void awake(IJobChangeEvent event) {
				}

				public void done(IJobChangeEvent event) {
					Job job = event.getJob();
					if (job.belongsTo(UpdateJob.FAMILY)) {
						Job [] remaining = Job.getJobManager().find(UpdateJob.FAMILY);
						updateProgress(false, remaining);
						jobNames.remove(job);
					}
				}

				public void running(IJobChangeEvent event) {
					Job job = event.getJob();
					if (job.belongsTo(UpdateJob.FAMILY)) {
						Job [] existing = Job.getJobManager().find(UpdateJob.FAMILY);
						updateProgress(true, existing);
					}
				}

				public void scheduled(IJobChangeEvent event) {
				}

				public void sleeping(IJobChangeEvent event) {
				}
			};
			Job.getJobManager().addJobChangeListener(jobListener);
		}
		jobNames.put(job, name);
	}

	private void updateProgress(final boolean begin, final Job[] jobs) {
		getShell().getDisplay().asyncExec(new Runnable() {
			public void run() {
				IProgressMonitor monitor = getStatusLineManager()
						.getProgressMonitor();
				if (begin) {
					if (jobs.length == 1)
						monitor.beginTask("", IProgressMonitor.UNKNOWN); //$NON-NLS-1$
					updateTaskName(monitor, jobs);
					getStatusLineManager().setCancelEnabled(true);
				} else {
					if (jobs.length == 0) {
						getStatusLineManager().setCancelEnabled(false);
						monitor.done();
					}
					else
						updateTaskName(monitor, jobs);
				}
				getStatusLineManager().update(true);
			}
		});
	}

	private void updateTaskName(IProgressMonitor monitor, Job [] jobs) {
		StringBuffer buf = new StringBuffer();
		for (int i=0; i<jobs.length; i++) {
			String name = (String)jobNames.get(jobs[i]);
			if (name!=null) {
				if (buf.length()>0)
					buf.append(", "); //$NON-NLS-1$
				buf.append(name);
			}
		}
		monitor.subTask(NLS.bind(
				UpdateUIMessages.ConfigurationManagerWindow_searchTaskName,
				buf.toString())); 
	}

	private void addSeparator(Composite parent) {
		GridData gd;
		Label separator = new Label(parent, SWT.SEPARATOR | SWT.HORIZONTAL);
		gd = new GridData(GridData.HORIZONTAL_ALIGN_FILL);
		gd.heightHint = 1;
		separator.setLayoutData(gd);
	}

	private void updateActionBars() {
		getMenuBarManager().updateAll(false);
		getToolBarManager().update(false);
		getStatusLineManager().update(false);
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.jface.window.Window#close()
	 */
	public boolean close() {
		if (jobListener != null)
			Job.getJobManager().removeJobChangeListener(jobListener);
		if (view != null)
			view.dispose();
		return super.close();
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.jface.window.Window#create()
	 */
	public void create() {
		super.create();
		// set the title
		getShell().setText(UpdateUIMessages.ConfigurationManagerAction_title);
		getShell().setSize(800, 600);
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.jface.window.Window#open()
	 */
	public int open() {
		// update action bars
		updateActionBars();
		return super.open();
	}

	public void setPropertiesActionHandler(IAction handler) {
		propertiesActionHandler = handler;
	}
}