/*******************************************************************************
 * Copyright (c) 2000, 2003 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials 
 * are made available under the terms of the Common Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/cpl-v10.html
 * 
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/

package org.eclipse.ui.views.bookmarkexplorer;

import org.eclipse.core.resources.IMarker;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.jface.dialogs.IDialogSettings;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.jface.viewers.ViewerSorter;

class BookmarkSorter extends ViewerSorter {
	
	private int[] directions;
	private int[] priorities;
	
	final static int ASCENDING = 1;
	final static int DESCENDING = -1;
	final static int DESCRIPTION = 0;
	final static int RESOURCE = 1;
	final static int FOLDER = 2;
	final static int LOCATION = 3;
	final static int CREATION_TIME = 4;
	final static int[] DEFAULT_PRIORITIES = 
		{ FOLDER,
		  RESOURCE,
		  LOCATION,
		  DESCRIPTION,
		  CREATION_TIME };
	final static int[] DEFAULT_DIRECTIONS = 
		{ ASCENDING,    //description
		  ASCENDING,	//resource
		  ASCENDING,	//folder
		  ASCENDING,	//location
		  ASCENDING, };	//creation time
									
	public BookmarkSorter() {
		resetState();
	}
	
	public void reverseTopPriority() {
		directions[priorities[0]] *= -1;
	}
	
	public void setTopPriority(int priority) {
		if (priority < 0 || priority >= priorities.length)
			return;
		
		int index = -1;
		for (int i = 0; i < priorities.length; i++) {
			if (priorities[i] == priority)
				index = i;
		}
		
		if (index == -1) {
			resetState();
			return;
		}
			
		//shift the array
		for (int i = index; i > 0; i--) {
			priorities[i] = priorities[i - 1];
		}
		priorities[0] = priority;
		directions[priority] = DEFAULT_DIRECTIONS[priority];
	}
	
	public void setTopPriorityDirection(int direction) {
		if (direction == ASCENDING || direction == DESCENDING)
			directions[priorities[0]] = direction;
	}
	
	public int getTopPriorityDirection() {
		return directions[priorities[0]];
	}
	
	public int getTopPriority() {
		return priorities[0];
	}
	
	public int[] getPriorities() {
		return priorities;
	}
	
	public void resetState() {
		priorities = new int[DEFAULT_PRIORITIES.length];
		System.arraycopy(DEFAULT_PRIORITIES, 0, priorities, 0, priorities.length);
		directions = new int[DEFAULT_DIRECTIONS.length];
		System.arraycopy(DEFAULT_DIRECTIONS, 0, directions, 0, directions.length);
	}
	
	private int compare(IMarker marker1, IMarker marker2, int depth) {
		if (depth >= priorities.length)
			return 0;
		
		int column = priorities[depth];
		switch (column) {
			case DESCRIPTION: {
				String desc1 = marker1.getAttribute(IMarker.MESSAGE, "");//$NON-NLS-1$
				String desc2 = marker2.getAttribute(IMarker.MESSAGE, "");//$NON-NLS-1$
				int result = collator.compare(desc1, desc2);
				if (result == 0)
					return compare(marker1, marker2, depth + 1);
				return result * directions[column];
			}
			case RESOURCE: {
				String res1 = marker1.getResource().getName();
				String res2 = marker2.getResource().getName();
				int result = collator.compare(res1, res2);
				if (result == 0)
					return compare(marker1, marker2, depth + 1);
				return result * directions[column];
			}
			case FOLDER: {
				String folder1 = BookmarkLabelProvider.getContainerName(marker1);
				String folder2 = BookmarkLabelProvider.getContainerName(marker2);
				int result = collator.compare(folder1, folder2);
				if (result == 0)
					return compare(marker1, marker2, depth + 1);
				return result * directions[column];
			}
			case LOCATION: {
				int line1 = marker1.getAttribute(IMarker.LINE_NUMBER, -1);
				int line2 = marker2.getAttribute(IMarker.LINE_NUMBER, -1);
				int result = line1 - line2;
				if (result == 0)
					return compare(marker1, marker2, depth + 1);
				return result * directions[column];
			}
			case CREATION_TIME: {
				long result;
				try {
					result = marker1.getCreationTime() - marker2.getCreationTime();
				} 
				catch (CoreException e) {
					result = 0;
				}
				if (result == 0)
					return compare(marker1, marker2, depth + 1);
				return ((int) result) * directions[column];
			}
		}
		
		return 0;
	}
	
	public int compare(Viewer viewer, Object e1, Object e2) {
		IMarker marker1 = (IMarker) e1;
		IMarker marker2 = (IMarker) e2;
		
		return compare(marker1, marker2, 0);
	}

	public void saveState(IDialogSettings settings) {
		if (settings == null)
			return;
			
		for (int i = 0; i < priorities.length; i++) { 
			settings.put("priority" + i, priorities[i]);//$NON-NLS-1$
			settings.put("direction" + i, directions[i]);//$NON-NLS-1$
		}
	}	
	
	public void restoreState(IDialogSettings settings) {
		if (settings == null)
			return;
		
		try {
			for (int i = 0; i < priorities.length; i++) {
				priorities[i] = settings.getInt("priority" + i);//$NON-NLS-1$
				directions[i] = settings.getInt("direction" + i);//$NON-NLS-1$
			}
		}
		catch (NumberFormatException e) {
			resetState();
		}
	}
}