/*
 *    This program is free software; you can redistribute it and/or modify
 *    it under the terms of the GNU General Public License as published by
 *    the Free Software Foundation; either version 2 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 General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License
 *    along with this program; if not, write to the Free Software
 *    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

/*
 * Copyright (C) 2002 University of Waikato 
 */

package weka.filters.unsupervised.attribute;

import weka.core.Attribute;
import weka.core.Instances;
import weka.core.TestInstances;
import weka.filters.AbstractFilterTest;
import weka.filters.Filter;

import junit.framework.Test;
import junit.framework.TestSuite;

/**
 * Tests StringToNominal. Run from the command line with:<p>
 * java weka.filters.unsupervised.attribute.StringToNominalTest
 *
 * @author <a href="mailto:len@reeltwo.com">Len Trigg</a>
 * @version $Revision: 4714 $
 */
public class StringToNominalTest extends AbstractFilterTest {
  
  public StringToNominalTest(String name) { super(name);  }

  /** Creates an example StringToNominal */
  public Filter getFilter() {
    StringToNominal f = new StringToNominal();
    f.setAttributeRange("1");
    return f;
  }
  
  /**
   * returns data generated for the FilteredClassifier test
   * 
   * @return		the dataset for the FilteredClassifier
   * @throws Exception	if generation of data fails
   */
  protected Instances getFilteredClassifierData() throws Exception{
    TestInstances	test;
    Instances		result;

    test = TestInstances.forCapabilities(m_FilteredClassifier.getCapabilities());
    test.setNumRelational(0);
    test.setClassIndex(TestInstances.CLASS_IS_LAST);

    result = test.generate();
    
    return result;
  }

  public void testTypical() {
    Instances result = useFilter();
    // Number of attributes and instances shouldn't change
    assertEquals(m_Instances.numAttributes(), result.numAttributes());
    assertEquals(m_Instances.numInstances(),  result.numInstances());
    assertEquals("Attribute type should now be NOMINAL",
                 Attribute.NOMINAL, result.attribute(0).type());

    assertEquals(14, result.attribute(0).numValues());
  }

  public void testMissing() {
    ((StringToNominal)m_Filter).setAttributeRange("4");
    Instances result = useFilter();
    // Number of attributes and instances shouldn't change
    assertEquals(m_Instances.numAttributes(), result.numAttributes());
    assertEquals(m_Instances.numInstances(),  result.numInstances());
    assertEquals("Attribute type should now be NOMINAL",
                 Attribute.NOMINAL, result.attribute(3).type());

    assertEquals(8, result.attribute(3).numValues());
    for (int i = 0; i < result.numInstances(); i++) {
      assertTrue("Missing values should be preserved",
             m_Instances.instance(i).isMissing(3) ==
             result.instance(i).isMissing(3));
    }
  }
  
  public void testRange() {
	    ((StringToNominal)m_Filter).setAttributeRange("first-last");
	    Instances result = useFilter();
	    // Number of attributes and instances shouldn't change
	    assertEquals(m_Instances.numAttributes(), result.numAttributes());
	    assertEquals(m_Instances.numInstances(),  result.numInstances());
	    
	    assertEquals("Attribute type should now be NOMINAL",
                Attribute.NOMINAL, result.attribute(0).type());
	    assertEquals("Attribute type should still be NOMINAL",
                Attribute.NOMINAL, result.attribute(1).type());
	    assertEquals("Attribute type should still be NUMERIC",
                Attribute.NUMERIC, result.attribute(2).type());
	    assertEquals("Attribute type should now be NOMINAL",
	                 Attribute.NOMINAL, result.attribute(3).type());
	    assertEquals("Attribute type should still be NOMINAL",
                Attribute.NOMINAL, result.attribute(4).type());
	    assertEquals("Attribute type should still be NUMERIC",
                Attribute.NUMERIC, result.attribute(5).type());
	    assertEquals("Attribute type should still be DATE",
                Attribute.DATE, result.attribute(6).type());

	    assertEquals(14, result.attribute(0).numValues());
	    
	    assertEquals(8, result.attribute(3).numValues());
	    for (int i = 0; i < result.numInstances(); i++) {
	      assertTrue("Missing values should be preserved",
	             m_Instances.instance(i).isMissing(3) ==
	             result.instance(i).isMissing(3));
	    }
	  }
  
  /**
   * tests the filter in conjunction with the FilteredClassifier
   */
  public void testFilteredClassifier() {
    try {
      Instances data = getFilteredClassifierData();

      for (int i = 0; i < data.numAttributes(); i++) {
	if (data.classIndex() == i)
	  continue;
	if (data.attribute(i).isString()) {
	  ((StringToNominal) m_FilteredClassifier.getFilter()).setAttributeRange(
	      "" + (i + 1));
	  break;
	}
      }
    }
    catch (Exception e) {
      fail("Problem setting up test for FilteredClassifier: " + e.toString());
    }
    
    super.testFilteredClassifier();
  }

  public static Test suite() {
    return new TestSuite(StringToNominalTest.class);
  }

  public static void main(String[] args){
    junit.textui.TestRunner.run(suite());
  }

}