/*
 *  RapidMiner
 *
 *  Copyright (C) 2001-2011 by Rapid-I and the contributors
 *
 *  Complete list of developers available at our web site:
 *
 *       http://rapid-i.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.operator.features.weighting;

import com.rapidminer.example.Attribute;
import com.rapidminer.example.AttributeWeights;
import com.rapidminer.example.ExampleSet;
import com.rapidminer.gui.dialog.AttributeWeightsDialog;
import com.rapidminer.operator.Operator;
import com.rapidminer.operator.OperatorDescription;
import com.rapidminer.operator.OperatorException;
import com.rapidminer.operator.ports.InputPort;
import com.rapidminer.operator.ports.OutputPort;
import com.rapidminer.operator.ports.metadata.MetaData;
import com.rapidminer.operator.ports.metadata.SimplePrecondition;


/**
 * This operator shows a window with the currently used attribute weights and
 * allows users to change the weight interactively.
 * 
 * @author Ingo Mierswa
 */
public class InteractiveAttributeWeighting extends Operator {

	private InputPort exampleSetInput = getInputPorts().createPort("example set", ExampleSet.class);
	private InputPort weightInput = getInputPorts().createPort("weight");

	private OutputPort exampleSetOutput = getOutputPorts().createPort("example set");
	private OutputPort weightOutput = getOutputPorts().createPort("weight");

	public InteractiveAttributeWeighting(OperatorDescription description) {
		super(description);

		weightInput.addPrecondition(new SimplePrecondition(weightInput, new MetaData(AttributeWeights.class), false));
		getTransformer().addPassThroughRule(exampleSetInput, exampleSetOutput);
		getTransformer().addPassThroughRule(weightInput, weightOutput);
	}

	@Override
	public void doWork() throws OperatorException {
		AttributeWeights weights = weightInput.getDataOrNull();
		ExampleSet exampleSet = null;
		if (weights == null) {
			log("No feature weights found in input. Trying to find an example set...");
			weights = new AttributeWeights();
			exampleSet = exampleSetInput.getDataOrNull();
			if (exampleSet != null) {
				for (Attribute attribute : exampleSet.getAttributes()) {
					weights.setWeight(attribute.getName(), 1.0d);
				}
				log("ExampleSet found! Initially all attributes will be used with weight 1.");
			} else {
				log("No examples found! Starting dialog without any weights.");
			}
		}

		AttributeWeightsDialog attributeWeightsDialog = new AttributeWeightsDialog(weights);
		attributeWeightsDialog.setVisible(true);

		if (attributeWeightsDialog.isOk()) {
			weights = attributeWeightsDialog.getAttributeWeights();
		}

		weightOutput.deliver(weights);
		exampleSetOutput.deliver(exampleSet);
	}
}