/*******************************************************************************
 * Copyright (c) 2007, 2010 Association for Decentralized Information Management
 * in Industry THTH ry.
 * 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:
 *     VTT Technical Research Centre of Finland - initial API and implementation
 *******************************************************************************/
package org.simantics.message.ui;

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;

import org.eclipse.core.runtime.IStatus;
import org.eclipse.jface.resource.JFaceResources;
import org.eclipse.jface.viewers.ITableFontProvider;
import org.eclipse.jface.viewers.ITableLabelProvider;
import org.eclipse.jface.viewers.LabelProvider;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.graphics.Image;
import org.simantics.message.IDetailStatus;

public class LogViewLabelProvider extends LabelProvider implements ITableLabelProvider, ITableFontProvider {

	private static int MAX_LABEL_LENGTH = 200;

    private Image debugImage;
    private Image infoImage;
	private Image okImage;
	private Image errorImage;
	private Image warningImage;
	private Image errorWithStackImage;
	private Image hierarchicalImage;
	ArrayList<Object> consumers = new ArrayList<Object>();

	private LogView logView;

	public LogViewLabelProvider(LogView logView) {
        debugImage = SharedImages.getImage(SharedImages.DESC_DEBUG_ST_OBJ);
        errorImage = SharedImages.getImage(SharedImages.DESC_ERROR_ST_OBJ);
		warningImage = SharedImages.getImage(SharedImages.DESC_WARNING_ST_OBJ);
		infoImage = SharedImages.getImage(SharedImages.DESC_INFO_ST_OBJ);
		okImage = SharedImages.getImage(SharedImages.DESC_OK_ST_OBJ);
		errorWithStackImage = SharedImages.getImage(SharedImages.DESC_ERROR_STACK_OBJ);
		hierarchicalImage = SharedImages.getImage(SharedImages.DESC_HIERARCHICAL_LAYOUT_OBJ);

		this.logView = logView;
	}

	public void dispose() {
		if (consumers.size() == 0) {
			super.dispose();
		}
	}

	public Image getColumnImage(Object element, int columnIndex) {
		if (element instanceof Group) {
			return (columnIndex == 0) ? hierarchicalImage : null;
		}

		LogEntry entry = (LogEntry) element;
		if (columnIndex == 0) {
			switch (entry.getSeverity()) {
				case IStatus.INFO :
					return infoImage;
				case IStatus.OK :
					return okImage;
                case IStatus.WARNING :
                    return warningImage;
                case IDetailStatus.DEBUG :
                    return debugImage;
				default :
					return (entry.getStack() == null ? errorImage : errorWithStackImage);
			}
		}
		return null;
	}

	public String getColumnText(Object element, int columnIndex) {
		if ((element instanceof LogSession) && (columnIndex == 2)) {
			LogSession session = (LogSession) element;
			if (session.getDate() == null)
				return ""; //$NON-NLS-1$

			DateFormat formatter = new SimpleDateFormat(LogEntry.F_DATE_FORMAT);
			return formatter.format(session.getDate());
		}

		if ((element instanceof Group) && (columnIndex == 0)) {
			return element.toString();
		}

		if (element instanceof LogEntry) {
			LogEntry entry = (LogEntry) element;
			switch (columnIndex) {
				case 0 :
					if (entry.getMessage() != null) {
						String message = entry.getMessage();
						if (message.length() > MAX_LABEL_LENGTH) {
							String warning = Messages.LogViewLabelProvider_truncatedMessage;
							StringBuffer sb = new StringBuffer(message.substring(0, MAX_LABEL_LENGTH - warning.length()));
							sb.append(warning);
							return sb.toString();
						}
						return entry.getMessage();
					}
				case 1 :
					if (entry.getPluginId() != null)
						return entry.getPluginId();
				case 2 :
					return entry.getFormattedDate();
			}
		}

		return ""; //$NON-NLS-1$
	}

	public void connect(Object consumer) {
		if (!consumers.contains(consumer))
			consumers.add(consumer);
	}

	public void disconnect(Object consumer) {
		consumers.remove(consumer);
		if (consumers.size() == 0) {
			dispose();
		}
	}

	public Font getFont(Object element, int columnIndex) {
		if ((element instanceof LogSession) && (logView.isCurrentLogSession((LogSession) element))) {
			return JFaceResources.getFontRegistry().getBold(JFaceResources.DEFAULT_FONT);
		}

		return null;
	}
}