/*
 *  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.utility;

import java.util.HashMap;
import java.util.List;
import java.util.Map;


/**
 * @author Marius Helf
 *
 */
public class CategoricalSizeProvider implements SizeProvider {
	// maps categories (identified by their value, not by their index)
	// to scaling factors
	private Map<Double, Double> sizeMap;
	private double minScalingFactor;
	private double maxScalingFactor;

	public CategoricalSizeProvider(List<Double> categoryList, double minSize, double maxSize) {
		this.sizeMap = createSizeMapping(categoryList, minSize, maxSize);
		updateMinMaxScalingFactor();
	}
	
	public CategoricalSizeProvider(Map<Double, Double> sizeMap) {
		this.sizeMap = sizeMap;
		updateMinMaxScalingFactor();
	}
	
	private void updateMinMaxScalingFactor() {
		minScalingFactor = Double.POSITIVE_INFINITY;
		maxScalingFactor = Double.NEGATIVE_INFINITY;
		for (Double factor : sizeMap.values()) {
			if (factor < minScalingFactor) {
				minScalingFactor = factor;
			}
			if (factor > maxScalingFactor) {
				maxScalingFactor = factor;
			}
		}
	}
	
	
	private Map<Double, Double> createSizeMapping(List<Double> categoryList, double minSize, double maxSize) {
		int categoryCount = categoryList.size();
		Map<Double,Double> sizeMap = new HashMap<Double, Double>();
		if (categoryCount>0) {
			ContinuousSizeProvider sizeProvider = new ContinuousSizeProvider(0,categoryCount-1, minSize, maxSize, false);
			int idx = 0;
			for (Double category : categoryList) {
				sizeMap.put(category, sizeProvider.getScalingFactorForValue((double) idx));
				++idx;
			}
		}
		return sizeMap;
	}


	@Override
	public double getScalingFactorForValue(double value) {
		return sizeMap.get(value);
	}

	@Override
	public boolean supportsCategoricalValues() {
		return true;
	}

	@Override
	public boolean supportsNumericalValues() {
		return false;
	}

	@Override
	public CategoricalSizeProvider clone() {
		Map<Double,Double> clonedSizeMap = new HashMap<Double, Double>();
		clonedSizeMap.putAll(sizeMap);
		return new CategoricalSizeProvider(clonedSizeMap);
	}

	@Override
	public double getMinScalingFactor() {
		return minScalingFactor;
	}

	@Override
	public double getMaxScalingFactor() {
		return maxScalingFactor;
	}
}