/*******************************************************************************
 * Copyright (c) 2004, 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.ui.internal.statushandlers;

import java.util.Collection;
import java.util.Collections;
import java.util.Date;
import java.util.HashSet;

import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.jobs.Job;
import org.eclipse.jface.dialogs.ErrorDialog;
import org.eclipse.osgi.util.NLS;
import org.eclipse.swt.SWTException;
import org.eclipse.swt.events.DisposeListener;
//import org.eclipse.swt.widgets.Display;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.internal.WorkbenchPlugin;
import org.eclipse.ui.internal.progress.ProgressManagerUtil;
import org.eclipse.ui.internal.progress.ProgressMessages;
import org.eclipse.ui.progress.IProgressConstants;
import org.eclipse.ui.statushandlers.StatusAdapter;

import com.ibm.icu.text.DateFormat;

/**
 * The StatusNotificationManager is the class that manages the display of status
 * information.
 */
public class StatusNotificationManager {

	private Collection errors = Collections.synchronizedSet(new HashSet());

	private StatusDialog dialog;

	private static StatusNotificationManager sharedInstance;

	private DisposeListener disposeListener = new DisposeListener() {
		/*
		 * (non-Javadoc)
		 * 
		 * @see org.eclipse.swt.events.DisposeListener#widgetDisposed(org.eclipse.swt.events.DisposeEvent)
		 */
		public void widgetDisposed(org.eclipse.swt.events.DisposeEvent e) {
			dialog = null;
			errors.clear();
		}
	};

	/**
	 * Returns the shared instance.
	 * 
	 * @return the shared instance
	 */
	public static StatusNotificationManager getInstance() {
		if (sharedInstance == null) {
			sharedInstance = new StatusNotificationManager();
		}
		return sharedInstance;
	}

	/**
	 * Create a new instance of the manager.
	 */
	private StatusNotificationManager() {
	}

	/**
	 * Add a new error to the list.
	 * 
	 * @param statusInfo
	 *            the error to be displayed
	 */
	public void addError(StatusAdapter statusAdapter, final boolean modal) {

		if (ErrorDialog.AUTOMATED_MODE == true) {
			return;
		}

		final StatusInfo statusInfo = new StatusInfo(statusAdapter);

		if (!PlatformUI.isWorkbenchRunning()) {
			// we are shutting down, so just log
			WorkbenchPlugin.log(statusInfo.getStatus().getStatus());
			return;
		}

		// Add the error in the UI thread to ensure thread safety in the
		// dialog
		if (dialog == null || dialog.getShell().isDisposed()) {

			errors.add(statusInfo);
			// Delay prompting if the status adapter property is set
			Object noPromptProperty = statusInfo.getStatus().getProperty(
					IProgressConstants.NO_IMMEDIATE_ERROR_PROMPT_PROPERTY);

			boolean prompt = true;
			if (noPromptProperty instanceof Boolean) {
				prompt = !((Boolean) noPromptProperty).booleanValue();
			}

			if (prompt && !PlatformUI.getWorkbench().isClosing()) {
				try{
	            	PlatformUI.getWorkbench().getDisplay().asyncExec(new Runnable() {
	            		public void run() {
	            			
	            			//Protect against a shutdown after the async was posted
	            		
	            			if(PlatformUI.getWorkbench().isClosing())
	            				return;
	            		
	            			if (dialog == null) {
	            				dialog = new StatusDialog(ProgressManagerUtil
	            						.getDefaultParent(), statusInfo,
	            						IStatus.INFO | IStatus.WARNING
	            						| IStatus.ERROR, modal);
	            				dialog.open();
	            				dialog.getShell().addDisposeListener(
									disposeListener);
	            			}
	            		}
	            	});
				}
				catch(SWTException exception){
					//Do nothing here as we will just not display if there are SWT issue
					//This protects an asyncExec on a disposed display
				}

			}
		} else {

			if (statusInfo.getStatus().getProperty(
					IProgressConstants.NO_IMMEDIATE_ERROR_PROMPT_PROPERTY) != null) {
				statusInfo.getStatus().setProperty(
						IProgressConstants.NO_IMMEDIATE_ERROR_PROMPT_PROPERTY,
						Boolean.FALSE);
			}

			if (!PlatformUI.getWorkbench().isClosing()) {
				try{
					PlatformUI.getWorkbench().getDisplay().syncExec(new Runnable() {
						public void run() {
							if(PlatformUI.getWorkbench().isClosing())
								return;
							openStatusDialog(modal,statusInfo);
                        }
                    });
				}
				catch (SWTException exception){
					//Do nothing here as we will just not display if there are SWT issue
					//This protects an syncExec on a disposed display
				}
            }
		}
	}

	/**
	 * Get the currently registered errors in the receiver.
	 * 
	 * @return Collection of ErrorInfo
	 */
	Collection getErrors() {
		return errors;
	}

	/**
	 * @param modal
	 * @param statusInfo
	 */
	void openStatusDialog(final boolean modal, final StatusInfo statusInfo) {
		errors.add(statusInfo);
		if (modal && !dialog.isModal()) {
			dialog.getShell().removeDisposeListener(disposeListener);
			dialog.close();
			dialog = new StatusDialog(ProgressManagerUtil.getDefaultParent(),
					statusInfo, IStatus.INFO | IStatus.WARNING | IStatus.ERROR,
					modal);

			dialog.open();
			dialog.getShell().addDisposeListener(disposeListener);
		} else {
			dialog.refresh();
		}
	}

	/**
	 * A wrapper class for statuses displayed in the dialog.
	 * 
	 */
	protected static class StatusInfo implements Comparable {

		public boolean equals(Object obj) {
			if (obj instanceof StatusInfo) {
				return statusAdapter.equals(((StatusInfo) obj).getStatus());
			}
			return super.equals(obj);
		}

		public int hashCode() {
			return statusAdapter.hashCode();
		}

		private final StatusAdapter statusAdapter;

		/**
		 * Constructs a simple <code>StatusInfo</code>, without any
		 * extensions.
		 * 
		 * @param status
		 *            the root status for this status info
		 */
		public StatusInfo(StatusAdapter statusAdapter) {
			this.statusAdapter = statusAdapter;

			Object timestampProperty = statusAdapter
					.getProperty(StatusAdapter.TIMESTAMP_PROPERTY);

			if (timestampProperty == null
					|| !(timestampProperty instanceof Long)) {
				statusAdapter.setProperty(StatusAdapter.TIMESTAMP_PROPERTY,
						new Long(System.currentTimeMillis()));
			}
		}

		String getDisplayString() {
			String text = statusAdapter.getStatus().getMessage();

			Job job = (Job) (statusAdapter.getAdapter(Job.class));
			if (job != null) {
				text = job.getName();
			}

			return NLS.bind(ProgressMessages.JobInfo_Error,
					(new Object[] {
							text,
							DateFormat.getDateTimeInstance(DateFormat.LONG,
									DateFormat.LONG).format(
									new Date(getTimestamp())) }));
		}

		/**
		 * Time when this status info was created.
		 * 
		 * @return the time
		 */
		public long getTimestamp() {
			return ((Long) statusAdapter
					.getProperty(StatusAdapter.TIMESTAMP_PROPERTY)).longValue();
		}

		/*
		 * (non-Javadoc)
		 * 
		 * @see java.lang.Comparable#compareTo(T)
		 */
		public int compareTo(Object arg0) {
			if (arg0 instanceof StatusInfo) {
				// Order ErrorInfo by time received
				long otherTimestamp = ((StatusInfo) arg0).getTimestamp();
				if (getTimestamp() < otherTimestamp) {
					return -1;
				} else if (getTimestamp() > otherTimestamp) {
					return 1;
				} else {
					return getDisplayString().compareTo(
							((StatusInfo) arg0).getDisplayString());
				}
			}
			return 0;
		}

		/**
		 * @return Returns the status.
		 */
		public StatusAdapter getStatus() {
			return statusAdapter;
		}
	}
}
