package org.exoplatform.commons.version.util;

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

import java.util.Locale;

import junit.framework.TestCase;

/**
 * Test ComparableVersion.
 *
 * @author <a href="mailto:hboutemy@apache.org">Herve Boutemy</a>
 * @version $Id$
 */
public class ComparableVersionTest
    extends TestCase
{
    private Comparable newComparable( String version )
    {
        return new ComparableVersion( version );
    }

    private static final String[] VERSIONS_QUALIFIER = {
        "1-SNAPSHOT", "1-alpha2snapshot", "1-alpha2", "1-alpha-123", "1-beta-2", "1-beta123", "1-m2", "1-m11", "1-rc",
        "1-cr2", "1-rc123", "1", "1-sp", "1-sp2", "1-sp123", "1-abc", "1-def", "1-1-snapshot", "1-1", "1-2", "1-123"
    };

    private static final String[] VERSIONS_NUMBER = {
        "2.0", "2-1", "2.0.a", "2.0.0.a", "2.0.2", "2.0.123", "2.1.0", "2.1-a", "2.1b", "2.1-c", "2.1-1", "2.1.0.1",
        "2.2", "2.123", "11.a2", "11.a11", "11.b2", "11.b11", "11.m2", "11.m11", "11", "11.a", "11b", "11c", "11m"
    };

    private void checkVersionsOrder( String[] versions )
    {
        Comparable[] c = new Comparable[ versions.length ];
        for( int i = 0; i < versions.length; i++ )
        {
            c[i] = newComparable( versions[i] );
        }

        for( int i = 1; i < versions.length; i++)
        {
            Comparable low = c[i - 1];
            for( int j = i; j < versions.length; j++ )
            {
                Comparable high = c[j];
                assertTrue( "expected " + low + " < " + high, low.compareTo( high ) < 0 );
                assertTrue( "expected " + high + " > " + low, high.compareTo( low ) > 0 );
            }
        }
    }

    private void checkVersionsEqual( String v1, String v2 )
    {
        Comparable c1 = newComparable( v1 );
        Comparable c2 = newComparable( v2 );
        assertTrue( "expected " + v1 + " == " + v2, c1.compareTo( c2 ) == 0 );
        assertTrue( "expected " + v2 + " == " + v1, c2.compareTo( c1 ) == 0 );
        assertTrue( "expected same hashcode for " + v1 + " and " + v2, c1.hashCode() == c2.hashCode() );
        assertTrue( "expected " + v1 + ".equals( " + v2 + " )", c1.equals( c2 ) );
        assertTrue( "expected " + v2 + ".equals( " + v1 + " )", c2.equals( c1 ) );
    }

    private void checkVersionsOrder( String v1, String v2 )
    {
        Comparable c1 = newComparable( v1 );
        Comparable c2 = newComparable( v2 );
        assertTrue( "expected " + v1 + " < " + v2, c1.compareTo( c2 ) < 0 );
        assertTrue( "expected " + v2 + " > " + v1, c2.compareTo( c1 ) > 0 );
    }

    public void testVersionsQualifier()
    {
        checkVersionsOrder( VERSIONS_QUALIFIER );
    }

    public void testVersionsNumber()
    {
        checkVersionsOrder( VERSIONS_NUMBER );
    }

    public void testVersionsEqual()
    {
        checkVersionsEqual( "1", "1" );
        checkVersionsEqual( "1", "1.0" );
        checkVersionsEqual( "1", "1.0.0" );
        checkVersionsEqual( "1.0", "1.0.0" );
        checkVersionsEqual( "1", "1-0" );
        checkVersionsEqual( "1", "1.0-0" );
        checkVersionsEqual( "1.0", "1.0-0" );
        checkVersionsEqual( "1a", "1.a" );
        checkVersionsEqual( "1a", "1-a" );
        checkVersionsEqual( "1a", "1.0-a" );
        checkVersionsEqual( "1a", "1.0.0-a" );
        checkVersionsEqual( "1.0a", "1.0.a" );
        checkVersionsEqual( "1.0.0a", "1.0.0.a" );

        // aliases
        checkVersionsEqual( "1ga", "1" );
        checkVersionsEqual( "1final", "1" );
        checkVersionsEqual( "1cr", "1rc" );

        // special "aliases" a, b and m for alpha, beta and milestone
        checkVersionsEqual( "1a1", "1alpha1" );
        checkVersionsEqual( "1b2", "1beta2" );
        checkVersionsEqual( "1m3", "1milestone3" );
    }

    public void testVersionComparing()
    {
        checkVersionsOrder( "1", "2" );
        checkVersionsOrder( "1.5", "2" );
        checkVersionsOrder( "1", "2.5" );
        checkVersionsOrder( "1.0", "1.1" );
        checkVersionsOrder( "1.1", "1.2" );
        checkVersionsOrder( "1.0.0", "1.1" );
        checkVersionsOrder( "1.0.1", "1.1" );
        checkVersionsOrder( "1.1", "1.2.0" );

        checkVersionsOrder( "1.0-alpha-1", "1.0" );
        checkVersionsOrder( "1.0-alpha-1", "1.0-alpha-2" );
        checkVersionsOrder( "1.0-alpha-1", "1.0-beta-1" );

        checkVersionsOrder( "1.0-SNAPSHOT", "1.0-beta-1" );
        checkVersionsOrder( "1.0-SNAPSHOT", "1.0" );
        checkVersionsOrder( "1.0-alpha-1-SNAPSHOT", "1.0-alpha-1" );

        checkVersionsOrder( "1.0", "1.0-1" );
        checkVersionsOrder( "1.0-1", "1.0-2" );
        checkVersionsOrder( "1.0.0", "1.0-1" );

        checkVersionsOrder( "2.0-1", "2.0.1" );
        checkVersionsOrder( "2.0.1-klm", "2.0.1-lmn" );
        checkVersionsOrder( "2.0.1", "2.0.1-xyz" );

        checkVersionsOrder( "2.0.1", "2.0.1-123" );
        checkVersionsOrder( "2.0.1-xyz", "2.0.1-123" );
    }

    public void testLocaleIndependent()
    {
        Locale orig = Locale.getDefault();
        Locale[] locales = { Locale.ENGLISH, new Locale( "tr" ), Locale.getDefault() };
        try
        {
            for ( int i = 0; i < locales.length; i++ )
            {
                Locale.setDefault( locales[i] );
                checkVersionsEqual( "1-abcdefghijklmnopqrstuvwxyz", "1-ABCDEFGHIJKLMNOPQRSTUVWXYZ" );
            }
        }
        finally
        {
            Locale.setDefault( orig );
        }
    }

    public void testReuse()
    {
        ComparableVersion c1 = new ComparableVersion( "1" );
        c1.parseVersion( "2" );

        Comparable c2 = newComparable( "2" );

        assertEquals( "reused instance should be equivalent to new instance", c1, c2 );
    }
}
