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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.SBXCrossover;
import org.uma.jmetal.operator.impl.mutation.PolynomialMutation;
import org.uma.jmetal.operator.impl.selection.BinaryTournamentSelection;
import org.uma.jmetal.problem.DoubleProblem;
import org.uma.jmetal.runner.AbstractAlgorithmRunner;
import org.uma.jmetal.solution.DoubleSolution;
import org.uma.jmetal.util.AlgorithmRunner;
import org.uma.jmetal.util.JMetalException;
import org.uma.jmetal.util.JMetalLogger;
import org.uma.jmetal.util.ProblemUtils;
import org.uma.jmetal.util.evaluator.SolutionListEvaluator;
import org.uma.jmetal.util.evaluator.impl.MultithreadedSolutionListEvaluator;

import java.io.FileNotFoundException;
import java.util.List;

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

public class ParallelNSGAIIRunner extends AbstractAlgorithmRunner {
  /**
   * @param args Command line arguments.
   * @throws SecurityException
   * Invoking command:
  java org.uma.jmetal.runner.multiobjective.ParallelNSGAIIRunner problemName [referenceFront]
   */
  public static void main(String[] args) throws JMetalException, FileNotFoundException {
    DoubleProblem problem;
    Algorithm> algorithm;
    CrossoverOperator crossover;
    MutationOperator mutation;
    SelectionOperator, DoubleSolution> selection;

    String referenceParetoFront = "" ;

    String problemName ;
    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.ZDT1";
      referenceParetoFront = "jmetal-problem/src/test/resources/pareto_fronts/ZDT1.pf" ;
    }

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

    double crossoverProbability = 0.9 ;
    double crossoverDistributionIndex = 20.0 ;
    crossover = new SBXCrossover(crossoverProbability, crossoverDistributionIndex) ;

    double mutationProbability = 1.0 / problem.getNumberOfVariables() ;
    double mutationDistributionIndex = 20.0 ;
    mutation = new PolynomialMutation(mutationProbability, mutationDistributionIndex) ;

    selection = new BinaryTournamentSelection();

    SolutionListEvaluator evaluator = new MultithreadedSolutionListEvaluator(0, problem) ;

    NSGAIIBuilder builder = new NSGAIIBuilder(problem, crossover, mutation)
        .setSelectionOperator(selection)
        .setMaxIterations(250)
        .setPopulationSize(100)
        .setSolutionListEvaluator(evaluator) ;

    algorithm = builder.build() ;

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

    builder.getSolutionListEvaluator().shutdown();

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

    evaluator.shutdown();

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

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