//  IntRealProblem.java
//
//  Author:
//       Antonio J. Nebro <antonio@lcc.uma.es>
//       Juan J. Durillo <durillo@lcc.uma.es>
//
//  Copyright (c) 2011 Antonio J. Nebro, Juan J. Durillo
//
//  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 <http://www.gnu.org/licenses/>.

package jmetal.problems;

import jmetal.core.Problem;
import jmetal.core.Solution;
import jmetal.core.Variable;
import jmetal.encodings.solutionType.IntRealSolutionType;
import jmetal.util.JMException;

/**
 * Class representing a problem having N integer and M real variables.
 * This is not a true problem; it is only intended as an example
 */
public class IntRealProblem extends Problem {  
    
  int intVariables_  ;
  int realVariables_ ;
  
  /** 
   * Constructor.
   * Creates a default instance of the IntRealProblem problem.
   */
  public IntRealProblem(String solutionType) throws ClassNotFoundException {
    this(solutionType, 3, 3);
  } // IntRealProblem
  
  /** 
   * Constructor.
   * Creates a new instance of the IntRealProblem problem.
   * @param intVariables Number of integer variables of the problem 
   * @param realVariables Number of real variables of the problem 
   */
  public IntRealProblem(String solutionType, int intVariables, int realVariables) {
    intVariables_  = intVariables  ;
    realVariables_ = realVariables ;
    
    numberOfVariables_   = intVariables_ + realVariables_ ;
    numberOfObjectives_  = 2                              ;
    numberOfConstraints_ = 0                              ;
    problemName_         = "IntRealProblem"               ;
        
    upperLimit_ = new double[numberOfVariables_] ;
    lowerLimit_ = new double[numberOfVariables_] ;
       
    for (int i = 0; i < intVariables; i++) {
      lowerLimit_[i] = -5 ;
      upperLimit_[i] =  5 ;
    } // for
        
    for (int i = intVariables; i < (intVariables + realVariables); i++) {
      lowerLimit_[i] = -5.0 ;
      upperLimit_[i] =  5.0  ;
    } // for
    
    if (solutionType.compareTo("IntReal") == 0)
    	solutionType_ = new IntRealSolutionType(this, intVariables, realVariables) ;
    else {
    	System.out.println("Error: solution type " + solutionType + " invalid") ;
    	System.exit(-1) ;
    }
  } // IntRealProblem
    
  /** 
  * Evaluates a solution 
  * @param solution The solution to evaluate
   * @throws JMException 
  */
  public void evaluate(Solution solution) throws JMException {
    Variable[] variable = solution.getDecisionVariables();
        
    double [] fx = new double[2] ; // function values     
   
    fx[0] = 0.0 ; 
    for (int var = 0; var < intVariables_ ; var++) {        
      fx[0] += (int)variable[var].getValue() ;
    } // for
        
    fx[1] = 0.0 ; 
    for (int var = intVariables_; var < numberOfVariables_ ; var++) {        
      fx[1] += variable[var].getValue() ;
    } // for
        
    solution.setObjective(0, fx[0]);
    solution.setObjective(1, fx[1]);
  } // evaluate
} // IntRealProblem