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package com.jme3.math;

import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.junit.Assert;
import org.junit.Test;

/**
 * Test the Transform class using JUnit.
 *
 * @author Stephen Gold
 */
public class TestTransform {
    /**
     * Test the {@code toString()} method.
     */
    @Test
    public void testTransformToString() {
        // Test data that's never modified:
        final Vector3f t = new Vector3f(12f, -1f, 5f);
        final Quaternion r = new Quaternion(0f, 0.6f, -0.8f, 0f);
        final Vector3f s = new Vector3f(1.7f, 1f, 1.7f);
        final Transform test = new Transform(t, r, s);

        // Verify that the method doesn't throw an exception.
        String result = test.toString();
        /*
         * Verify that the result matches the javadoc
         * and can be parsed using a regular expression.
         */
        Pattern pattern = Pattern.compile(
                "^Transform\\[ (\\S+), (\\S+), (\\S+)\\]\\n"
                + "\\[ (\\S+), (\\S+), (\\S+), (\\S+)\\]\\n"
                + "\\[ (\\S+) , (\\S+), (\\S+)\\]$"
        );
        Matcher matcher = pattern.matcher(result);
        boolean valid = matcher.matches();
        Assert.assertTrue(valid);

        String txText = matcher.group(1);
        float tx = Float.parseFloat(txText);
        Assert.assertEquals(12f, tx, 1e-5f);

        String rzText = matcher.group(6);
        float rz = Float.parseFloat(rzText);
        Assert.assertEquals(-0.8f, rz, 1e-6f);

        String szText = matcher.group(10);
        float sz = Float.parseFloat(szText);
        Assert.assertEquals(1.7f, sz, 2e-6f);
    }
}