/*
 *  RapidMiner
 *
 *  Copyright (C) 2001-2014 by RapidMiner and the contributors
 *
 *  Complete list of developers available at our web site:
 *
 *       http://rapidminer.com
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Affero General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU Affero General Public License for more details.
 *
 *  You should have received a copy of the GNU Affero General Public License
 *  along with this program.  If not, see http://www.gnu.org/licenses/.
 */
package com.rapidminer.gui.new_plotter.configuration;

import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;

import com.rapidminer.gui.new_plotter.configuration.DimensionConfig.PlotDimension;
import com.rapidminer.gui.new_plotter.utility.DataStructureUtils;
import com.rapidminer.gui.new_plotter.utility.ValueRange;

/**
 * Wrapper for a map of Dimension to ValueRange. Implements an equals() method
 * which is based on instance comparison of map entries instead of reference comparison.
 * 
 * What is a group cell?
 * The grouping of several dimension axes results a multi dimensional matrix, where each
 * matrix cell contains data. Each cell is identified by exactly one group of each dimension.
 * A group in turn is resembled by a ValueRange object. Thus a map from Dimension to ValueRange
 * resembles the key of this multi dimensional matrix. 
 * 
 * @author Marius Helf, Nils Woehler
 *
 */
public class GroupCellKey implements Cloneable {

	Map<PlotDimension,ValueRange> groupCell;

	
	public GroupCellKey() {
		groupCell = new HashMap<DimensionConfig.PlotDimension, ValueRange>();
	}
	
	public GroupCellKey(Map<PlotDimension, ValueRange> groupCell) {
		this.groupCell = groupCell;
	}
	
	
	public ValueRange getRangeForDimension(PlotDimension d) {
		return groupCell.get(d);
	}
	
	public void setRangeForDimension(PlotDimension d, ValueRange range) {
		groupCell.put(d, range);
	}
	
	public void removeRangeForDimension(PlotDimension d) {
		groupCell.remove(d);
	}
	
	public int size() {
		return groupCell.size();
	}
	

	@Override
	public boolean equals(Object obj) {
		if(obj == null || !(obj instanceof GroupCellKey)) {
			return false;
		}
		
		GroupCellKey otherKey = (GroupCellKey)obj;
		Map<?,?> otherMap = (Map<?,?>)otherKey.groupCell;
		
		if(otherMap.size() != groupCell.size()) {
			return false;
		}
		
		
		for( Entry<PlotDimension,ValueRange> entry : groupCell.entrySet()) {
			Object otherValue = otherMap.get(entry.getKey());
			Object thisValue = entry.getValue();
			if (!(thisValue == null ? otherValue==null : thisValue.equals(otherValue))) {
				return false;
			}
		}
		
		return true;
	}
	
	@Override
	public int hashCode() {
		return groupCell.hashCode();
	}

	@Override
	public String toString() {
		StringBuilder builder = new StringBuilder();
		builder.append("GroupCellKey: ");
		builder.append(groupCell.toString());
		return builder.toString();		
	}
	
	public String getNiceString(PlotConfiguration plotConfiguration) {
		StringBuilder builder = new StringBuilder();
		boolean firstEntry = true;
		for (Entry<PlotDimension, ValueRange> entry : groupCell.entrySet()) {
			ValueRange range = entry.getValue();
			if (range != null) {
				if (firstEntry) {
					firstEntry = false;
				} else {
					builder.append("; ");
				}
				PlotDimension dimension = entry.getKey();
				String dimensionAttribute = plotConfiguration.getDimensionConfig(dimension).getDataTableColumn().getName();
				builder.append(dimensionAttribute);
				builder.append(" = ");
				builder.append(range.toString());
			}
		}
		return builder.toString();		
	}
	
	@Override
	public Object clone() {
		return new GroupCellKey(DataStructureUtils.getMapClone(groupCell));
	}
}