/*
 * Copyright 2017 Red Hat, Inc. and/or its affiliates.
 *
 * 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.jbpm.runtime.manager.impl;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertTrue;

import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Properties;
import java.util.Set;

import javax.persistence.EntityManagerFactory;

import org.jbpm.runtime.manager.impl.jpa.EntityManagerFactoryManager;
import org.jbpm.runtime.manager.util.TestUtil;
import org.jbpm.services.task.identity.JBossUserGroupCallbackImpl;
import org.jbpm.test.listener.NodeLeftCountDownProcessEventListener;
import org.jbpm.test.util.AbstractBaseTest;
import org.jbpm.test.util.PoolingDataSource;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.kie.api.event.process.DefaultProcessEventListener;
import org.kie.api.event.process.ProcessEventListener;
import org.kie.api.event.process.ProcessNodeLeftEvent;
import org.kie.api.event.process.ProcessStartedEvent;
import org.kie.api.io.ResourceType;
import org.kie.api.runtime.KieSession;
import org.kie.api.runtime.manager.RuntimeEngine;
import org.kie.api.runtime.manager.RuntimeEnvironment;
import org.kie.api.runtime.manager.RuntimeEnvironmentBuilder;
import org.kie.api.runtime.manager.RuntimeManager;
import org.kie.api.runtime.manager.RuntimeManagerFactory;
import org.kie.api.runtime.manager.audit.AuditService;
import org.kie.api.runtime.manager.audit.ProcessInstanceLog;
import org.kie.api.runtime.process.ProcessInstance;
import org.kie.api.task.UserGroupCallback;
import org.kie.internal.io.ResourceFactory;
import org.kie.internal.runtime.manager.InternalRuntimeManager;
import org.kie.internal.runtime.manager.context.CaseContext;
import org.kie.internal.runtime.manager.context.ProcessInstanceIdContext;

public class PerCaseRuntimeManagerTest extends AbstractBaseTest {
    private PoolingDataSource pds;
    private UserGroupCallback userGroupCallback;
    private RuntimeManager manager; 
    private EntityManagerFactory emf;
    @Before
    public void setup() {
        Properties properties= new Properties();
        properties.setProperty("mary", "HR");
        properties.setProperty("john", "HR");
        userGroupCallback = new JBossUserGroupCallbackImpl(properties);

        pds = TestUtil.setupPoolingDataSource();
        
        emf = EntityManagerFactoryManager.get().getOrCreate("org.jbpm.persistence.jpa");
    }
    
    @After
    public void teardown() {
        manager.close();
        EntityManagerFactoryManager.get().clear();
        pds.close();
    }
    
    @Test
    public void testCreationOfSession() {
        final Set<Long> ksessionUsed = new HashSet<Long>();
        RuntimeEnvironment environment = RuntimeEnvironmentBuilder.Factory.get()
    			.newDefaultBuilder()
                .userGroupCallback(userGroupCallback)
                .entityManagerFactory(emf)
                .addAsset(ResourceFactory.newClassPathResource("BPMN2-ScriptTask.bpmn2"), ResourceType.BPMN2)
                .addAsset(ResourceFactory.newClassPathResource("BPMN2-UserTask.bpmn2"), ResourceType.BPMN2)
                .registerableItemsFactory(new DefaultRegisterableItemsFactory(){

                    @Override
                    public List<ProcessEventListener> getProcessEventListeners(RuntimeEngine runtime) {
                        List<ProcessEventListener> listeners = super.getProcessEventListeners(runtime);
                        listeners.add(new DefaultProcessEventListener(){

                            @Override
                            public void beforeProcessStarted(ProcessStartedEvent event) {
                                ksessionUsed.add(((KieSession)event.getKieRuntime()).getIdentifier());
                            }
                             
                             
                         });
                        
                        return listeners;
                    }                   
                })
                .get();
        
        manager = RuntimeManagerFactory.Factory.get().newPerCaseRuntimeManager(environment);
        assertNotNull(manager);
       
        // ksession for process instance #1
        // since there is no process instance yet we need to get new session
        RuntimeEngine runtime = manager.getRuntimeEngine(CaseContext.get("Case-1"));
        KieSession ksession = runtime.getKieSession();

        assertNotNull(ksession);       
        long ksession1Id = ksession.getIdentifier();
        assertTrue(ksession1Id > 0);
        

        // ksession for process instance #2
        // since there is no process instance yet we need to get new session
        RuntimeEngine runtime2 = manager.getRuntimeEngine(CaseContext.get("Case-2"));
        KieSession ksession2 = runtime2.getKieSession();

        assertNotNull(ksession2);       
        long ksession2Id = ksession2.getIdentifier();
        assertTrue(ksession2Id > ksession1Id);
        
        ProcessInstance pi1 = ksession.startProcess("UserTask");
        
        ProcessInstance pi2 = ksession2.startProcess("UserTask");
        
        // both processes started 
        assertEquals(ProcessInstance.STATE_ACTIVE, pi1.getState());
        assertEquals(ProcessInstance.STATE_ACTIVE, pi2.getState());
        
        manager.disposeRuntimeEngine(runtime);
        manager.disposeRuntimeEngine(runtime2);
        
        runtime = manager.getRuntimeEngine(ProcessInstanceIdContext.get(pi1.getId()));
        ksession = runtime.getKieSession();
        assertEquals(ksession1Id, ksession.getIdentifier());
        
        runtime2 = manager.getRuntimeEngine(ProcessInstanceIdContext.get(pi2.getId()));
        ksession2 = runtime2.getKieSession();
        assertEquals(ksession2Id, ksession2.getIdentifier());
        
        manager.disposeRuntimeEngine(runtime);
        manager.disposeRuntimeEngine(runtime2);
        
        // now let's check by case context
        runtime = manager.getRuntimeEngine(CaseContext.get("Case-1"));
        ksession = runtime.getKieSession();
        assertEquals(ksession1Id, ksession.getIdentifier());
        
        runtime2 = manager.getRuntimeEngine(CaseContext.get("Case-2"));
        ksession2 = runtime2.getKieSession();
        assertEquals(ksession2Id, ksession2.getIdentifier());
        
        assertEquals(2, ksessionUsed.size());
        assertTrue(ksessionUsed.contains(ksession1Id));
        assertTrue(ksessionUsed.contains(ksession2Id));
        
        manager.disposeRuntimeEngine(runtime);
        manager.disposeRuntimeEngine(runtime2);
        manager.close();
    }

    @Test
    public void testEventSignalingBetweenProcessesWithPeristence() {
        final Set<Long> ksessionUsed = new HashSet<Long>();
        RuntimeEnvironment environment = RuntimeEnvironmentBuilder.Factory.get()
                .newDefaultBuilder()
                .userGroupCallback(userGroupCallback)
                .addAsset(ResourceFactory.newClassPathResource("events/throw-an-event.bpmn"), ResourceType.BPMN2)
                .addAsset(ResourceFactory.newClassPathResource("events/start-on-event.bpmn"), ResourceType.BPMN2)
                .registerableItemsFactory(new DefaultRegisterableItemsFactory(){

                    @Override
                    public List<ProcessEventListener> getProcessEventListeners(RuntimeEngine runtime) {
                        List<ProcessEventListener> listeners = super.getProcessEventListeners(runtime);
                        listeners.add(new DefaultProcessEventListener(){

                            @Override
                            public void beforeProcessStarted(ProcessStartedEvent event) {
                                ksessionUsed.add(((KieSession)event.getKieRuntime()).getIdentifier());
                            }
                             
                             
                         });
                        
                        return listeners;
                    }                   
                })
                .get();
        
        manager = RuntimeManagerFactory.Factory.get().newPerCaseRuntimeManager(environment);        
        assertNotNull(manager);
        
        RuntimeEngine runtime = manager.getRuntimeEngine(CaseContext.get("Case-1"));
        KieSession ksession = runtime.getKieSession();
        long ksession1Id = ksession.getIdentifier();
        assertNotNull(ksession);  
        
        ksession.startProcess("com.sample.bpmn.hello");
        
        AuditService auditService = runtime.getAuditService();
        
        List<? extends ProcessInstanceLog> throwProcessLogs = auditService.findProcessInstances("com.sample.bpmn.hello");
        List<? extends ProcessInstanceLog> catchProcessLogs = auditService.findProcessInstances("com.sample.bpmn.Second");
        
        assertNotNull(throwProcessLogs);
        assertEquals(1, throwProcessLogs.size());
        assertEquals(ProcessInstance.STATE_COMPLETED, throwProcessLogs.get(0).getStatus().intValue());
        
        assertNotNull(catchProcessLogs);
        assertEquals(1, catchProcessLogs.size());
        assertEquals(ProcessInstance.STATE_COMPLETED, catchProcessLogs.get(0).getStatus().intValue());
        
        assertEquals(1, ksessionUsed.size());
        assertEquals(ksession1Id, ksessionUsed.iterator().next().longValue());
        
        manager.disposeRuntimeEngine(runtime);     
        manager.close();
    }
    
    @Test
    public void testExecuteReusableSubprocess() {
        final Set<Long> ksessionUsed = new HashSet<Long>();
        
        RuntimeEnvironment environment = RuntimeEnvironmentBuilder.Factory.get()
                .newDefaultBuilder()
                .userGroupCallback(userGroupCallback)
                .addAsset(ResourceFactory.newClassPathResource("BPMN2-CallActivity.bpmn2"), ResourceType.BPMN2)
                .addAsset(ResourceFactory.newClassPathResource("BPMN2-CallActivitySubProcess.bpmn2"), ResourceType.BPMN2)
                .registerableItemsFactory(new DefaultRegisterableItemsFactory(){

                    @Override
                    public List<ProcessEventListener> getProcessEventListeners(RuntimeEngine runtime) {
                        List<ProcessEventListener> listeners = super.getProcessEventListeners(runtime);
                        listeners.add(new DefaultProcessEventListener(){

                            @Override
                            public void beforeProcessStarted(ProcessStartedEvent event) {
                                ksessionUsed.add(((KieSession)event.getKieRuntime()).getIdentifier());
                            }
                             
                             
                         });
                        
                        return listeners;
                    }                   
                })
                .get();
        
        manager = RuntimeManagerFactory.Factory.get().newPerCaseRuntimeManager(environment);        
        assertNotNull(manager);
        // since there is no process instance yet we need to get new session
        RuntimeEngine runtime = manager.getRuntimeEngine(CaseContext.get("Case-1"));
        KieSession ksession = runtime.getKieSession();

        assertNotNull(ksession);       
        long ksession1Id = ksession.getIdentifier();
        assertTrue(ksession1Id == 2);

        ProcessInstance pi1 = ksession.startProcess("ParentProcess");
        
        assertEquals(ProcessInstance.STATE_ACTIVE, pi1.getState());
        
        manager.disposeRuntimeEngine(runtime);
        
        runtime = manager.getRuntimeEngine(CaseContext.get("Case-1"));
        ksession = runtime.getKieSession();
        ksession.getWorkItemManager().completeWorkItem(1, null);
        
        
        AuditService logService = runtime.getAuditService();
        
        List<? extends ProcessInstanceLog> logs = logService.findActiveProcessInstances("ParentProcess");
        assertNotNull(logs);
        assertEquals(0, logs.size());
        
        logs = logService.findActiveProcessInstances("SubProcess");
        assertNotNull(logs);
        assertEquals(0, logs.size());
        
        logs = logService.findProcessInstances("ParentProcess");
        assertNotNull(logs);
        assertEquals(1, logs.size());
        
        String externalId = logs.get(0).getExternalId();
        assertEquals(manager.getIdentifier(), externalId);
        
        logs = logService.findProcessInstances("SubProcess");
        assertNotNull(logs);
        assertEquals(1, logs.size());
        externalId = logs.get(0).getExternalId();
        assertEquals(manager.getIdentifier(), externalId);
        
        assertEquals(1, ksessionUsed.size());
        assertEquals(ksession1Id, ksessionUsed.iterator().next().longValue());
        manager.disposeRuntimeEngine(runtime);
        manager.close();
    }
    
    @Test
    public void testMultipleProcessesInSingleCaseCompletedInSequence() {
        final Set<Long> ksessionUsed = new HashSet<Long>();
        RuntimeEnvironment environment = RuntimeEnvironmentBuilder.Factory.get()
                .newDefaultBuilder()
                .userGroupCallback(userGroupCallback)
                .entityManagerFactory(emf)
                .addAsset(ResourceFactory.newClassPathResource("BPMN2-ScriptTask.bpmn2"), ResourceType.BPMN2)
                .registerableItemsFactory(new DefaultRegisterableItemsFactory(){

                    @Override
                    public List<ProcessEventListener> getProcessEventListeners(RuntimeEngine runtime) {
                        List<ProcessEventListener> listeners = super.getProcessEventListeners(runtime);
                        listeners.add(new DefaultProcessEventListener(){

                            @Override
                            public void beforeProcessStarted(ProcessStartedEvent event) {
                                ksessionUsed.add(((KieSession)event.getKieRuntime()).getIdentifier());
                            }
                             
                             
                         });
                        
                        return listeners;
                    }                   
                })
                .get();
        
        manager = RuntimeManagerFactory.Factory.get().newPerCaseRuntimeManager(environment);
        assertNotNull(manager);
       
        // ksession for process instance #1
        // since there is no process instance yet we need to get new session
        RuntimeEngine runtime = manager.getRuntimeEngine(CaseContext.get("Case-1"));
        KieSession ksession = runtime.getKieSession();

        assertNotNull(ksession);       
        long ksession1Id = ksession.getIdentifier();
        assertTrue(ksession1Id > 0);
        
        
        ProcessInstance pi1 = ksession.startProcess("ScriptTask");
        assertEquals(ProcessInstance.STATE_COMPLETED, pi1.getState());
        manager.disposeRuntimeEngine(runtime);
        
        runtime = manager.getRuntimeEngine(CaseContext.get("Case-1"));
        ksession = runtime.getKieSession();
        ProcessInstance pi2 = ksession.startProcess("ScriptTask");
        assertEquals(ProcessInstance.STATE_COMPLETED, pi2.getState());
        
        // there should be only one ksession used
        assertEquals(1, ksessionUsed.size());
        assertEquals(ksession1Id, ksessionUsed.iterator().next().longValue());
        
        
        manager.close();
    }
    
    @Test(timeout=10000)
    public void testTimerOnPerCaseManager() throws Exception {
        final Set<Long> ksessionUsed = new HashSet<Long>();
        final NodeLeftCountDownProcessEventListener countDownListener = new NodeLeftCountDownProcessEventListener("timer", 3);
        final List<Long> timerExpirations = new ArrayList<Long>();
         
        RuntimeEnvironment environment = RuntimeEnvironmentBuilder.Factory.get()
                .newDefaultBuilder()
                .userGroupCallback(userGroupCallback)
                .registerableItemsFactory(new DefaultRegisterableItemsFactory(){

                    @Override
                    public List<ProcessEventListener> getProcessEventListeners(
                            RuntimeEngine runtime) {
                        List<ProcessEventListener> listeners = super.getProcessEventListeners(runtime);
                        listeners.add(new DefaultProcessEventListener(){
                             @Override
                             public void afterNodeLeft(ProcessNodeLeftEvent event) {
                                 if (event.getNodeInstance().getNodeName().equals("timer")) {
                                     timerExpirations.add(event.getProcessInstance().getId());
                                     
                                     ksessionUsed.add(((KieSession)event.getKieRuntime()).getIdentifier());
                                 }
                             }
                             
                         });
                        listeners.add(new DefaultProcessEventListener(){

                            @Override
                            public void beforeProcessStarted(ProcessStartedEvent event) {
                                ksessionUsed.add(((KieSession)event.getKieRuntime()).getIdentifier());
                            }
                             
                             
                         });
                        listeners.add(countDownListener);
                        return listeners;
                    }                   
                })
                .addAsset(ResourceFactory.newClassPathResource("BPMN2-IntermediateCatchEventTimerCycle3.bpmn2"), ResourceType.BPMN2)
                .get();
        
        manager = RuntimeManagerFactory.Factory.get().newPerCaseRuntimeManager(environment);        
        assertNotNull(manager);
        // ksession for process instance #1
        // since there is no process instance yet we need to get new session
        RuntimeEngine runtime = manager.getRuntimeEngine(CaseContext.get("Case-1"));
        KieSession ksession = runtime.getKieSession();
        long ksession1Id = ksession.getIdentifier();
        
        ProcessInstance pi1 = ksession.startProcess("IntermediateCatchEvent");
        // both processes started 
        assertEquals(ProcessInstance.STATE_ACTIVE, pi1.getState());
        manager.disposeRuntimeEngine(runtime);

        // wait a bit for some timers to fire
        countDownListener.waitTillCompleted();
        runtime = manager.getRuntimeEngine(CaseContext.get("Case-1"));
        ksession = runtime.getKieSession();
        ksession.abortProcessInstance(pi1.getId());

        manager.disposeRuntimeEngine(runtime);
        manager.close();
                
        // there should be only one ksession used
        assertEquals(1, ksessionUsed.size());
        assertEquals(ksession1Id, ksessionUsed.iterator().next().longValue());
    }
    
    @Test
    public void testSignalEventWithDeactivate() {
        RuntimeEnvironment environment = RuntimeEnvironmentBuilder.Factory.get()
                .newDefaultBuilder()
                .userGroupCallback(userGroupCallback)
                .addAsset(ResourceFactory.newClassPathResource("events/start-on-event.bpmn"), ResourceType.BPMN2)
                .get();
        
        manager = RuntimeManagerFactory.Factory.get().newPerCaseRuntimeManager(environment);        
        assertNotNull(manager);
        
        RuntimeEngine runtime1 = manager.getRuntimeEngine(CaseContext.get("Case-1"));
        KieSession ksession1 = runtime1.getKieSession();
          
        ksession1.signalEvent("SampleEvent", null);        
        
        
        List<? extends ProcessInstanceLog> logs = runtime1.getAuditService().findProcessInstances();
        assertEquals(1, logs.size());
        manager.disposeRuntimeEngine(runtime1);
        
        ((InternalRuntimeManager) manager).deactivate();
        
        runtime1 = manager.getRuntimeEngine(CaseContext.get("Case-1"));
        ksession1 = runtime1.getKieSession();
        
        ksession1.signalEvent("SampleEvent", null); 
        
        logs = runtime1.getAuditService().findProcessInstances();
        assertEquals(1, logs.size());
        manager.disposeRuntimeEngine(runtime1);
        
        ((InternalRuntimeManager) manager).activate();
        
        runtime1 = manager.getRuntimeEngine(CaseContext.get("Case-1"));
        ksession1 = runtime1.getKieSession();
        
        ksession1.signalEvent("SampleEvent", null); 
        
        logs = runtime1.getAuditService().findProcessInstances();
        assertEquals(2, logs.size());
        manager.disposeRuntimeEngine(runtime1);
        
    }
    
    @Test(timeout=10000)
    public void testTimerStartWithDeactivate() {
        final NodeLeftCountDownProcessEventListener countDownListener = new NodeLeftCountDownProcessEventListener("Hello", 1);
        RuntimeEnvironment environment = RuntimeEnvironmentBuilder.Factory.get()
                .newDefaultBuilder()
                .userGroupCallback(userGroupCallback)
                .addAsset(ResourceFactory.newClassPathResource("BPMN2-TimerStart.bpmn2"), ResourceType.BPMN2)
                .registerableItemsFactory(new DefaultRegisterableItemsFactory(){

                    @Override
                    public List<ProcessEventListener> getProcessEventListeners(RuntimeEngine runtime) {

                        List<ProcessEventListener> listeners = super.getProcessEventListeners(runtime);
                        listeners.add(countDownListener);
                        return listeners;
                    }
                    
                })
                .get();
        
        manager = RuntimeManagerFactory.Factory.get().newPerCaseRuntimeManager(environment);        
        assertNotNull(manager);
        
        countDownListener.waitTillCompleted();
        
        RuntimeEngine runtime1 = manager.getRuntimeEngine(CaseContext.get("Case-1"));

        List<? extends ProcessInstanceLog> logs = runtime1.getAuditService().findProcessInstances();
        assertEquals(1, logs.size());
        manager.disposeRuntimeEngine(runtime1);        
        
        ((InternalRuntimeManager) manager).deactivate();
        
        countDownListener.reset(1);
        countDownListener.waitTillCompleted(2000);
        
        runtime1 = manager.getRuntimeEngine(CaseContext.get("Case-1"));
        
        logs = runtime1.getAuditService().findProcessInstances();
        assertEquals(1, logs.size());
        manager.disposeRuntimeEngine(runtime1);
        
        ((InternalRuntimeManager) manager).activate();
        
        countDownListener.reset(1);
        countDownListener.waitTillCompleted();        
        
        runtime1 = manager.getRuntimeEngine(CaseContext.get("Case-1"));
        
        logs = runtime1.getAuditService().findProcessInstances();
        assertEquals(2, logs.size());
        manager.disposeRuntimeEngine(runtime1);
        
    }
}
