/**
 * Copyright 2010 JBoss Inc
 *
 * Licensed 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.drools.runtime.pipeline.impl;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import javax.xml.transform.stream.StreamSource;

import junit.framework.TestCase;

import org.drools.KnowledgeBase;
import org.drools.KnowledgeBaseFactory;
import org.drools.builder.KnowledgeBuilder;
import org.drools.builder.KnowledgeBuilderFactory;
import org.drools.builder.ResourceType;
import org.drools.io.ResourceFactory;
import org.drools.runtime.StatefulKnowledgeSession;
import org.drools.runtime.pipeline.Action;
import org.drools.runtime.pipeline.Expression;
import org.drools.runtime.pipeline.KnowledgeRuntimeCommand;
import org.drools.runtime.pipeline.Pipeline;
import org.drools.runtime.pipeline.PipelineFactory;
import org.drools.runtime.pipeline.ResultHandler;
import org.drools.runtime.pipeline.Splitter;
import org.drools.runtime.pipeline.Transformer;
import org.drools.runtime.rule.FactHandle;

import com.thoughtworks.xstream.XStream;

public class XStreamStatefulSessionTest extends TestCase {

    public void testDirectRoot() throws Exception {
        KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();

        kbuilder.add( ResourceFactory.newClassPathResource( "test_XStreamDirectRoot.drl",
                                                            XStreamStatefulSessionTest.class ),
                      ResourceType.DRL );

        assertFalse( kbuilder.hasErrors() );

        KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();
        kbase.addKnowledgePackages( kbuilder.getKnowledgePackages() );

        StatefulKnowledgeSession ksession = kbase.newStatefulKnowledgeSession();
        List list = new ArrayList();
        ksession.setGlobal( "list",
                            list );

        Action executeResultHandler = PipelineFactory.newExecuteResultHandler();

        KnowledgeRuntimeCommand insertStage = PipelineFactory.newStatefulKnowledgeSessionInsert();
        insertStage.setReceiver( executeResultHandler );

        XStream xstream = new XStream();
        Transformer transformer = PipelineFactory.newXStreamFromXmlTransformer( xstream );
        transformer.setReceiver( insertStage );

        Pipeline pipeline = PipelineFactory.newStatefulKnowledgeSessionPipeline( ksession );
        pipeline.setReceiver( transformer );

        ResultHandlerImpl resultHandler = new ResultHandlerImpl();
        pipeline.insert( getClass().getResourceAsStream( "XStreamDirectRoot.xml" ),
                         resultHandler );
        ksession.fireAllRules();

        Map<FactHandle, Object> handles = (Map<FactHandle, Object>) resultHandler.getObject();

        assertEquals( 1,
                      handles.size() );
        assertEquals( 1,
                      list.size() );

        assertEquals( "example.OrderItem",
                      list.get( 0 ).getClass().getName() );
    }

    public void testNestedIterable() throws Exception {
        KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();

        kbuilder.add( ResourceFactory.newClassPathResource( "test_XStreamNestedIterable.drl",
                                                            XStreamStatefulSessionTest.class ),
                      ResourceType.DRL );

        assertFalse( kbuilder.hasErrors() );

        KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();
        kbase.addKnowledgePackages( kbuilder.getKnowledgePackages() );

        StatefulKnowledgeSession ksession = kbase.newStatefulKnowledgeSession();
        List list = new ArrayList();
        ksession.setGlobal( "list",
                            list );

        Action executeResultHandler = PipelineFactory.newExecuteResultHandler();

        KnowledgeRuntimeCommand insertStage = PipelineFactory.newStatefulKnowledgeSessionInsert();
        insertStage.setReceiver( executeResultHandler );

        Splitter splitter = PipelineFactory.newIterateSplitter();
        splitter.setReceiver( insertStage );

        XStream xstream = new XStream();
        Transformer transformer = PipelineFactory.newXStreamFromXmlTransformer( xstream );
        transformer.setReceiver( splitter );

        Pipeline pipeline = PipelineFactory.newStatefulKnowledgeSessionPipeline( ksession );
        pipeline.setReceiver( transformer );

        ResultHandlerImpl resultHandler = new ResultHandlerImpl();
        pipeline.insert( getClass().getResourceAsStream( "XStreamNestedIterable.xml" ),
                         resultHandler );

        Map<FactHandle, Object> handles = (Map<FactHandle, Object>) resultHandler.getObject();
        ksession.fireAllRules();

        assertEquals( 2,
                      handles.size() );
        assertEquals( 2,
                      list.size() );

        assertEquals( "example.OrderItem",
                      list.get( 0 ).getClass().getName() );
        assertEquals( "example.OrderItem",
                      list.get( 1 ).getClass().getName() );

        assertNotSame( list.get( 0 ),
                       list.get( 1 ) );
    }

    public static class ResultHandlerImpl
        implements
        ResultHandler {
        Object object;

        public void handleResult(Object object) {
            this.object = object;
        }

        public Object getObject() {
            return this.object;
        }
    }

}