/* This file is part of the Joshua Machine Translation System.
 * 
 * Joshua 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 2.1
 * of the License, or (at your option) any later version.
 *
 * This library 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 library; if not, write to the Free
 * Software Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */
package joshua.decoder;

import java.io.File;
import java.io.IOException;
import java.util.Scanner;

import org.testng.Assert;
import org.testng.annotations.Parameters;
import org.testng.annotations.Test;

/**
 * Performs regression tests to verify 
 * that the decoder produces expected output
 * on known data sets.
 * 
 * @author Lane Schwartz
 * @version $LastChangedDate: 2009-03-27 12:35:38 -0500 (Fri, 27 Mar 2009) $
 */
public class JoshuaDecoderTest {

	@Parameters({"configFile","sourceInput","referenceOutput"})
	@Test
	public void regressionTest(String configFile, String sourceInput, String referenceOutput) throws IOException {
				
		File referenceFile = new File(referenceOutput);
		File output = File.createTempFile("output", null);//, referenceFile.getParentFile());
	
		String[] args = {configFile, sourceInput, output.getAbsoluteFile().toString()};
		JoshuaDecoder.main(args);
		
		
		Scanner resultScanner = new Scanner(output);
		Scanner refScanner = new Scanner(referenceFile);
		
		while (resultScanner.hasNextLine() && refScanner.hasNextLine()) {
			
			String resultLine = resultScanner.nextLine();
			String refLine = refScanner.nextLine();
			
			String[] resultParts = resultLine.split(" \\|\\|\\| ");
			String[] refParts = refLine.split(" \\|\\|\\| ");
			
			Assert.assertEquals(resultParts.length, 4);
			Assert.assertEquals(refParts.length, 4);
			
			Assert.assertEquals(Integer.parseInt(resultParts[0]), Integer.parseInt(refParts[0]));
			Assert.assertEquals(resultParts[1], refParts[1]);
			
			String[] resultFeatures = resultParts[2].split(" ");
			String[] refFeatures = refParts[2].split(" ");
			
			Assert.assertEquals(resultFeatures.length, 5);
			Assert.assertEquals(refFeatures.length, 5);
			
			float acceptableDelta = 0.001f;
			for (int i=0; i<refFeatures.length; i++) {
				Assert.assertEquals(Float.valueOf(resultFeatures[i]), Float.valueOf(refFeatures[i]), acceptableDelta);
			}
		}
		
	}
	
}