/*
 *  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.authz.support;


import static org.junit.Assert.assertEquals;
import static org.junit.Assert.fail;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;

import org.apache.directory.shared.ldap.aci.ACITuple;
import org.apache.directory.shared.ldap.aci.MicroOperation;
import org.apache.directory.shared.ldap.aci.ProtectedItem;
import org.apache.directory.shared.ldap.aci.UserClass;
import org.apache.directory.shared.ldap.aci.ProtectedItem.MaxValueCountItem;
import org.apache.directory.shared.ldap.constants.AuthenticationLevel;
import org.apache.directory.shared.ldap.entry.DefaultEntry;
import org.apache.directory.shared.ldap.entry.Entry;
import org.apache.directory.shared.ldap.exception.LdapInvalidDnException;
import org.apache.directory.shared.ldap.name.DN;
import org.apache.directory.shared.ldap.schema.SchemaManager;
import org.apache.directory.shared.ldap.schema.loader.ldif.JarLdifSchemaLoader;
import org.apache.directory.shared.ldap.schema.manager.impl.DefaultSchemaManager;
import org.apache.directory.shared.ldap.util.LdapExceptionUtils;
import org.junit.Before;
import org.junit.BeforeClass;
import org.junit.Test;


/**
 * Tests {@link MaxValueCountFilter}.
 *
 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
 * @version $Rev$, $Date$
 */
public class MaxValueCountFilterTest
{
    private static final Collection<ACITuple> EMPTY_ACI_TUPLE_COLLECTION = Collections.unmodifiableCollection( new ArrayList<ACITuple>() );
    private static final Collection<UserClass> EMPTY_USER_CLASS_COLLECTION = Collections.unmodifiableCollection( new ArrayList<UserClass>() );
    private static final Collection<ProtectedItem> EMPTY_PROTECTED_ITEM_COLLECTION = Collections.unmodifiableCollection( new ArrayList<ProtectedItem>() );

    private static final Set<MicroOperation> EMPTY_MICRO_OPERATION_SET = Collections.unmodifiableSet( new HashSet<MicroOperation>() );

    private static final Collection<ProtectedItem> PROTECTED_ITEMS = new ArrayList<ProtectedItem>();
    private static Entry ENTRY;
    private static Entry FULL_ENTRY;

    static
    {
        Collection<MaxValueCountItem> mvcItems = new ArrayList<MaxValueCountItem>();
        mvcItems.add( new MaxValueCountItem( "cn", 2 ) );
        PROTECTED_ITEMS.add( new ProtectedItem.MaxValueCount( mvcItems ) );
    }


    /** A reference to the schemaManager */
    private static SchemaManager schemaManager;

    
    @BeforeClass public static void init() throws Exception
    {
        JarLdifSchemaLoader loader = new JarLdifSchemaLoader();

        schemaManager = new DefaultSchemaManager( loader );

        boolean loaded = schemaManager.loadAllEnabled();

        if ( !loaded )
        {
            fail( "Schema load failed : " + LdapExceptionUtils.printErrors( schemaManager.getErrors() ) );
        }
    }
    
    
    @Before 
    public void setup() throws LdapInvalidDnException
    {
        DN entryName = new DN( "ou=test, ou=system" );
        ENTRY = new DefaultEntry( schemaManager, entryName );
        FULL_ENTRY = new DefaultEntry( schemaManager, entryName );
        
        ENTRY.put( "cn", "1" );
        FULL_ENTRY.put( "cn", "1", "2", "3" );
    }


    @Test 
    public void testWrongScope() throws Exception
    {
        MaxValueCountFilter filter = new MaxValueCountFilter();
        Collection<ACITuple> tuples = new ArrayList<ACITuple>();
        tuples.add( new ACITuple( EMPTY_USER_CLASS_COLLECTION, AuthenticationLevel.NONE, EMPTY_PROTECTED_ITEM_COLLECTION, 
            EMPTY_MICRO_OPERATION_SET, true, 0 ) );

        tuples = Collections.unmodifiableCollection( tuples );

        assertEquals( tuples, filter.filter( null, tuples, OperationScope.ATTRIBUTE_TYPE, null, null, null, null,
            null, null, null, null, null, null, null ) );

        assertEquals( tuples, filter.filter( null, tuples, OperationScope.ENTRY, null, null, null, null, null, null,
            null, null, null, null, null ) );
    }


    @Test 
    public void testZeroTuple() throws Exception
    {
        MaxValueCountFilter filter = new MaxValueCountFilter();

        assertEquals( 0, filter.filter( null, EMPTY_ACI_TUPLE_COLLECTION, OperationScope.ATTRIBUTE_TYPE_AND_VALUE, 
            null, null, null, null, null, null, null, null, null, null, null ).size() );
    }


    @Test 
    public void testDenialTuple() throws Exception
    {
        MaxValueCountFilter filter = new MaxValueCountFilter();
        Collection<ACITuple> tuples = new ArrayList<ACITuple>();
        tuples.add( new ACITuple( EMPTY_USER_CLASS_COLLECTION, AuthenticationLevel.NONE, PROTECTED_ITEMS, 
            EMPTY_MICRO_OPERATION_SET, false, 0 ) );

        tuples = Collections.unmodifiableCollection( tuples );

        assertEquals( tuples, filter.filter( null, tuples, OperationScope.ATTRIBUTE_TYPE_AND_VALUE, null, null, null,
            null, null, null, "cn", null, ENTRY, null, null ) );
        assertEquals( tuples, filter.filter( null, tuples, OperationScope.ATTRIBUTE_TYPE_AND_VALUE, null, null, null,
            null, null, null, "cn", null, FULL_ENTRY, null, null ) );
    }


    @Test 
    public void testGrantTuple() throws Exception
    {
        MaxValueCountFilter filter = new MaxValueCountFilter();
        Collection<ACITuple> tuples = new ArrayList<ACITuple>();
        
        // Test with this ACI :
        // 
        tuples.add( new ACITuple( 
            EMPTY_USER_CLASS_COLLECTION, 
            AuthenticationLevel.NONE, 
            PROTECTED_ITEMS, 
            EMPTY_MICRO_OPERATION_SET, 
            true, 
            0 ) );

        assertEquals( 1, filter.filter( null, tuples, OperationScope.ATTRIBUTE_TYPE_AND_VALUE, null, null, null, null,
            null, null, "cn", null, ENTRY, null, ENTRY ).size() );

        assertEquals( 0, filter.filter( null, tuples, OperationScope.ATTRIBUTE_TYPE_AND_VALUE, null, null, null, null,
            null, null, "cn", null, FULL_ENTRY, null, FULL_ENTRY ).size() );
    }
}