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//  NSGAIIRunner.java
//
//  Author:
//       Antonio J. Nebro 
//
//  Copyright (c) 2014 Antonio J. Nebro
//
//  This program is free software: you can redistribute it and/or modify
//  it under the terms of the GNU Lesser 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 Lesser General Public License for more details.
// 
//  You should have received a copy of the GNU Lesser General Public License
//  along with this program.  If not, see .

package org.uma.jmetal.runner.multiobjective;

import org.uma.jmetal.algorithm.Algorithm;
import org.uma.jmetal.algorithm.multiobjective.nsgaii.NSGAIIBuilder;
import org.uma.jmetal.operator.CrossoverOperator;
import org.uma.jmetal.operator.MutationOperator;
import org.uma.jmetal.operator.SelectionOperator;
import org.uma.jmetal.operator.impl.crossover.SinglePointCrossover;
import org.uma.jmetal.operator.impl.mutation.BitFlipMutation;
import org.uma.jmetal.operator.impl.selection.BinaryTournamentSelection;
import org.uma.jmetal.problem.BinaryProblem;
import org.uma.jmetal.runner.AbstractAlgorithmRunner;
import org.uma.jmetal.solution.BinarySolution;
import org.uma.jmetal.util.AlgorithmRunner;
import org.uma.jmetal.util.JMetalLogger;
import org.uma.jmetal.util.ProblemUtils;

import java.util.List;

/**
 * Class for configuring and running the NSGA-II algorithm (binary encoding)
 *
 * @author Antonio J. Nebro 
 */

public class NSGAIIBinaryRunner extends AbstractAlgorithmRunner {
  /**
   * @param args Command line arguments.
   * @throws org.uma.jmetal.util.JMetalException
   * @throws java.io.IOException
   * @throws SecurityException
   * @throws ClassNotFoundException
   * Invoking command:
  java org.uma.jmetal.runner.multiobjective.NSGAIIBinaryRunner problemName [referenceFront]
   */
  public static void main(String[] args) throws
          Exception {

    BinaryProblem problem;
    Algorithm> algorithm;
    CrossoverOperator crossover;
    MutationOperator mutation;
    SelectionOperator, BinarySolution> selection;

    String problemName ;
    String referenceParetoFront = "" ;
    if (args.length == 1) {
      problemName = args[0];
    } else if (args.length == 2) {
      problemName = args[0] ;
      referenceParetoFront = args[1] ;
    } else {
      problemName = "org.uma.jmetal.problem.multiobjective.zdt.ZDT5";
      referenceParetoFront = "" ;
    }

    problem = (BinaryProblem) ProblemUtils. loadProblem(problemName);

    double crossoverProbability = 0.9 ;
    crossover = new SinglePointCrossover(crossoverProbability) ;

    double mutationProbability = 1.0 / problem.getNumberOfBits(0) ;
    mutation = new BitFlipMutation(mutationProbability) ;

    selection = new BinaryTournamentSelection() ;

    algorithm = new NSGAIIBuilder(problem, crossover, mutation)
            .setSelectionOperator(selection)
            .setMaxEvaluations(25000)
            .setPopulationSize(100)
            .build() ;

    AlgorithmRunner algorithmRunner = new AlgorithmRunner.Executor(algorithm)
            .execute() ;

    List population = algorithm.getResult() ;
    long computingTime = algorithmRunner.getComputingTime() ;

    JMetalLogger.logger.info("Total execution time: " + computingTime + "ms");

    printFinalSolutionSet(population);
    if (!referenceParetoFront.equals("")) {
      printQualityIndicators(population, referenceParetoFront) ;
    }
  }
}