/*
 * 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.
 */
package org.apache.directory.server.core.partition.impl.btree.jdbm;


import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;

import java.io.File;

import jdbm.RecordManager;
import jdbm.recman.BaseRecordManager;

import org.apache.directory.server.xdbm.Table;
import org.apache.directory.shared.ldap.constants.SchemaConstants;
import org.apache.directory.shared.ldap.schema.SchemaManager;
import org.apache.directory.shared.ldap.schema.comparators.SerializableComparator;
import org.apache.directory.shared.ldap.schema.ldif.extractor.SchemaLdifExtractor;
import org.apache.directory.shared.ldap.schema.ldif.extractor.impl.DefaultSchemaLdifExtractor;
import org.apache.directory.shared.ldap.schema.loader.ldif.LdifSchemaLoader;
import org.apache.directory.shared.ldap.schema.manager.impl.DefaultSchemaManager;
import org.apache.directory.shared.ldap.util.LdapExceptionUtils;
import org.junit.After;
import org.junit.Before;
import org.junit.BeforeClass;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;


/**
 * Document me!
 *
 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
 * @version $Rev$, $Date$
 */
public class JdbmTableNoDuplicatesTest
{
    private static final Logger LOG = LoggerFactory.getLogger( JdbmTableNoDuplicatesTest.class.getSimpleName() );
    private static final String TEST_OUTPUT_PATH = "test.output.path";

    transient Table<String,String> table;
    transient File dbFile;
    transient RecordManager recman;
    private static SchemaManager schemaManager;


    @BeforeClass
    public static void init() throws Exception
    {
        String workingDirectory = System.getProperty( "workingDirectory" );

        if ( workingDirectory == null )
        {
            String path = DupsContainerCursorTest.class.getResource( "" ).getPath();
            int targetPos = path.indexOf( "target" );
            workingDirectory = path.substring( 0, targetPos + 6 );
        }

        File schemaRepository = new File( workingDirectory, "schema" );
        SchemaLdifExtractor extractor = new DefaultSchemaLdifExtractor( new File( workingDirectory ) );
        extractor.extractOrCopy( true );
        LdifSchemaLoader loader = new LdifSchemaLoader( schemaRepository );
        schemaManager = new DefaultSchemaManager( loader );

        boolean loaded = schemaManager.loadAllEnabled();

        if ( !loaded )
        {
            fail( "Schema load failed : " + LdapExceptionUtils.printErrors( schemaManager.getErrors() ) );
        }
    }

    
    @Before
    public void createTable() throws Exception
    {
        destryTable();
        File tmpDir = null;
        
        if ( System.getProperty( TEST_OUTPUT_PATH, null ) != null )
        {
            tmpDir = new File( System.getProperty( TEST_OUTPUT_PATH ) );
        }

        dbFile = File.createTempFile( getClass().getSimpleName(), "db", tmpDir );
        recman = new BaseRecordManager( dbFile.getAbsolutePath() );

        SerializableComparator<String> comparator = new SerializableComparator<String>( SchemaConstants.INTEGER_ORDERING_MATCH_MR_OID );
        comparator.setSchemaManager( schemaManager );
        table = new JdbmTable<String,String>( schemaManager, "test", recman, comparator, null, null );
        LOG.debug( "Created new table and populated it with data" );
    }


    @After
    public void destryTable() throws Exception
    {
        if ( table != null )
        {
            table.close();
        }

        table = null;

        if ( recman != null )
        {
            recman.close();
        }

        recman = null;

        if ( dbFile != null )
        {
            String fileToDelete = dbFile.getAbsolutePath();
            new File( fileToDelete + ".db" ).delete();
            new File( fileToDelete + ".lg" ).delete();

            dbFile.delete();
        }
        
        dbFile = null;
    }
    

    @Test
    public void testCloseReopen() throws Exception
    {
        table.put( "1", "2" );
        table.close();
        SerializableComparator<String> comparator = new SerializableComparator<String>( SchemaConstants.INTEGER_ORDERING_MATCH_MR_OID );
        comparator.setSchemaManager( schemaManager );
        table = new JdbmTable<String,String>( schemaManager, "test", recman, comparator, null, null );
        assertEquals( "2", table.get( "1" ) );
    }

    
    @Test 
    public void testConfigMethods() throws Exception
    {
        assertFalse( table.isDupsEnabled() );
        assertEquals( "test", table.getName() );
        assertNotNull( table.getKeyComparator() );
    }

    
    @Test
    public void testWhenEmpty() throws Exception
    {
        // Test the count methods
        assertEquals( 0, table.count() );
        assertEquals( 0, table.count( "1" ) );

        // Test get method
        assertNull( table.get( "0" ) );
        
        // Test remove methods
        table.remove( "1" );
        assertNull( table.get( "1" ) );
        
        // Test has operations
        assertFalse( table.has( "1" ) );
        assertFalse( table.has( "1", "0" ) );
        assertFalse( table.hasGreaterOrEqual( "1" ) );
        assertFalse( table.hasLessOrEqual( "1" ) );

        try
        {
            assertFalse( table.hasGreaterOrEqual( "1", "0" ) );
            fail( "Should never get here." );
        }
        catch ( UnsupportedOperationException e )
        {
        }

        try
        {
            assertFalse( table.hasLessOrEqual( "1", "0" ) );
            fail( "Should never get here." );
        }
        catch ( UnsupportedOperationException e )
        {
        }
    }

    
    @Test
    public void testLoadData() throws Exception
    {
        // add some data to it
        for ( int i = 0; i < 10; i++ )
        {
            String istr = Integer.toString( i );
            table.put( istr, istr );
        }
        
        assertEquals( 10, table.count() );
        assertEquals( 1, table.count( "0" ) );
        
        /*
         * If counts are exact then we can test for exact values.  Again this 
         * is not a critical function but one used for optimization so worst 
         * case guesses are allowed.
         */
        
        if ( table.isCountExact() )
        {
            assertEquals( 5, table.lessThanCount( "5" ) );
            assertEquals( 4, table.greaterThanCount( "5" ) );
        }
        else
        {
            assertEquals( 10, table.lessThanCount( "5" ) );
            assertEquals( 10, table.greaterThanCount( "5" ) );
        }
    }
    
    
    /**
     * Let's test keys with a null or lack of any values.
     * @throws Exception on error
     */
    @Test
    public void testNullOrEmptyKeyValue() throws Exception
    {
        assertEquals( 0, table.count() );
        
        try
        {
            table.put( "1", null );
            fail( "should never get here due to IllegalArgumentException" );
        }
        catch( IllegalArgumentException e )
        {
            assertNotNull( e );
        }
        
        try
        {
            table.put( null, "2" );
            fail( "should never get here due to IllegalArgumentException" );
        }
        catch( IllegalArgumentException e )
        {
            assertNotNull( e );
        }
        
        assertEquals( 0, table.count() );
        assertEquals( null, table.get( "1" ) );
        
        // Let's add the key with a valid value and remove just the value
        assertEquals( 0, table.count( "1" ) );
        table.remove( "1" );
        assertEquals( 0, table.count( "1" ) );
        table.put( "1", "1" );
        assertEquals( 1, table.count( "1" ) );
        table.remove( "1", "1" );
        assertEquals( 0, table.count( "1" ) );
        assertNull( table.get( "1" ) );
        assertFalse( table.has( "1" ) );
    }
    

    @Test
    public void testRemove() throws Exception
    {
        table.put( "1", "1" );
        table.remove( "1" );
        assertNull( table.get( "1" ) );

        table.put( "10", "10" );
        
        table.remove( "10", "11" );
        assertFalse( table.has( "10", "11" ) );
        
//        assertNull( table.remove( null ) );
//        assertNull( table.remove( null, null ) );
    }


    @Test
    public void testPut() throws Exception
    {
        final int SIZE = 15;

        for ( int i = 0; i < SIZE; i++ )
        {
            String istr = Integer.toString( i );
            table.put( istr, istr );
        }
        
        assertEquals( SIZE, table.count() );
        table.put( "0", "0" );
        assertTrue( table.has( "0", "0" ) );
    }
    

    @Test
    public void testHas() throws Exception
    {
        assertFalse( table.has( "1" ) );
        final int SIZE = 15;
        
        for ( int i = 0; i < SIZE; i++ )
        {
            String istr = Integer.toString( i );
            table.put( istr, istr );
        }
        assertEquals( SIZE, table.count() );

        assertFalse( table.has( "-1" ) );
        assertTrue( table.hasGreaterOrEqual( "-1" ) );
        assertFalse( table.hasLessOrEqual( "-1" ) );
        
        assertTrue( table.has( "0" ) );
        assertTrue( table.hasGreaterOrEqual( "0" ) );
        assertTrue( table.hasLessOrEqual( "0" ) );
        
        assertTrue( table.has( Integer.toString( SIZE - 1 ) ) );
        assertTrue( table.hasGreaterOrEqual( Integer.toString( SIZE - 1 ) ) );
        assertTrue( table.hasLessOrEqual( Integer.toString( SIZE - 1 ) ) );
        
        assertFalse( table.has( Integer.toString( SIZE ) ) );
        assertFalse( table.hasGreaterOrEqual( Integer.toString( SIZE ) ) );
        assertTrue( table.hasLessOrEqual( Integer.toString( SIZE ) ) );
        table.remove( "10" );
        table.remove( "11" );
        assertTrue( table.hasLessOrEqual( "11" ) );
        
        try
        {
            assertFalse( table.hasGreaterOrEqual( "1", "1" ) );
            fail( "Should never get here." );
        }
        catch ( UnsupportedOperationException e )
        {
        }

        try
        {
            assertFalse( table.hasLessOrEqual( "1", "1" ) );
            fail( "Should never get here." );
        }
        catch ( UnsupportedOperationException e )
        {
        }

        try
        {
            assertTrue( table.hasLessOrEqual( "1", "2" ) );
            fail( "Should never get here since no dups tables " +
                  "freak when they cannot find a value comparator" );
        } 
        catch ( UnsupportedOperationException e )
        {
            assertNotNull( e );
        }
    }
}