/*
 * 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.uima.fit.factory;

import static org.apache.uima.fit.factory.AnalysisEngineFactory.createEngine;
import static org.apache.uima.fit.factory.AnalysisEngineFactory.createEngineDescription;
import static org.apache.uima.fit.factory.ExternalResourceFactory.bindResourceOnce;
import static org.apache.uima.fit.factory.ExternalResourceFactory.createResourceDescription;
import static org.apache.uima.fit.factory.ExternalResourceFactory.createSharedResourceDescription;
import static org.junit.Assert.assertNotNull;

import java.io.ByteArrayInputStream;
import java.io.IOException;

import org.apache.commons.io.output.ByteArrayOutputStream;
import org.apache.uima.UIMAFramework;
import org.apache.uima.analysis_engine.AnalysisEngine;
import org.apache.uima.analysis_engine.AnalysisEngineDescription;
import org.apache.uima.analysis_engine.AnalysisEngineProcessException;
import org.apache.uima.cas.CAS;
import org.apache.uima.fit.component.CasAnnotator_ImplBase;
import org.apache.uima.fit.component.ExternalResourceAware;
import org.apache.uima.fit.descriptor.ConfigurationParameter;
import org.apache.uima.fit.descriptor.ExternalResource;
import org.apache.uima.fit.factory.testRes.TestExternalResource;
import org.apache.uima.fit.factory.testRes.TestSharedResourceObject;
import org.apache.uima.resource.ExternalResourceDescription;
import org.apache.uima.util.InvalidXMLException;
import org.apache.uima.util.XMLInputSource;
import org.junit.Before;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.TestName;
import org.xml.sax.SAXException;

/**
 */
public class AnalysisEngineFactoryExternalResourceTest {
  /**
   * Test simple injection.
   */
  @Test
  public void resource_testInjection() throws Exception {
    AnalysisEngineDescription aeDesc = saveLoad(createEngineDescription(
            TestAnalysisEngineWithResource.class,
            TestAnalysisEngineWithResource.PARAM_RESOURCE,
            createResourceDescription(TestExternalResource.class,
                    TestExternalResource.PARAM_VALUE, TestExternalResource.EXPECTED_VALUE)));

    AnalysisEngine ae = createEngine(aeDesc);
    ae.process(ae.newCAS());
  }

  /**
   * Test shared simple injection.
   */
  @Test
  public void resource_testSharedInjection() throws Exception {
    ExternalResourceDescription resDesc = createResourceDescription(
            TestExternalResource.class, TestExternalResource.PARAM_VALUE,
            TestExternalResource.EXPECTED_VALUE);

    AnalysisEngineDescription aeDesc1 = saveLoad(createEngineDescription(
            TestAnalysisEngineWithResource.class, TestAnalysisEngineWithResource.PARAM_RESOURCE,
            resDesc));

    AnalysisEngineDescription aeDesc2 = saveLoad(createEngineDescription(
            TestAnalysisEngineWithResource.class, TestAnalysisEngineWithResource.PARAM_RESOURCE,
            resDesc));

//    dumpResourceConfiguration(aeDesc1);
//    dumpResourceConfiguration(aeDesc2);

    AnalysisEngine ae1 = createEngine(aeDesc1);
    AnalysisEngine ae2 = createEngine(aeDesc2);
    ae1.process(ae1.newCAS());
    ae2.process(ae2.newCAS());

    AnalysisEngine ae3 = createEngine(createEngineDescription(aeDesc1, aeDesc2));
    ae3.process(ae3.newCAS());
  }

  /**
   * Test simple nesting.
   */
  @Test
  public void resource_testSimpleNesting() throws Exception {
    AnalysisEngineDescription aeDesc = saveLoad(createEngineDescription(
            TestAnalysisEngineWithResource.class,
            TestAnalysisEngineWithResource.PARAM_RESOURCE,
            createResourceDescription(
                    TestExternalResource2.class,
                    TestExternalResource.PARAM_VALUE,
                    TestExternalResource.EXPECTED_VALUE,
                    TestExternalResource2.PARAM_RESOURCE,
                    createResourceDescription(TestExternalResource.class,
                            TestExternalResource.PARAM_VALUE, TestExternalResource.EXPECTED_VALUE))));

    AnalysisEngine ae = createEngine(aeDesc);
    ae.process(ae.newCAS());
  }

  /**
   * Test simple nesting.
   */
  @Test
  public void resource_testSharedSimpleNesting() throws Exception {
    ExternalResourceDescription resDesc = createResourceDescription(
            TestExternalResource2.class,
            TestExternalResource.PARAM_VALUE,
            TestExternalResource.EXPECTED_VALUE,
            TestExternalResource2.PARAM_RESOURCE,
            createResourceDescription(TestExternalResource.class,
                    TestExternalResource.PARAM_VALUE, TestExternalResource.EXPECTED_VALUE));

    AnalysisEngineDescription aeDesc1 = saveLoad(createEngineDescription(
            TestAnalysisEngineWithResource.class, TestAnalysisEngineWithResource.PARAM_RESOURCE,
            resDesc));

//    dumpResourceConfiguration(aeDesc1);

    AnalysisEngineDescription aeDesc2 = saveLoad(createEngineDescription(
            TestAnalysisEngineWithResource.class, TestAnalysisEngineWithResource.PARAM_RESOURCE,
            resDesc));

//    dumpResourceConfiguration(aeDesc1);
//    dumpResourceConfiguration(aeDesc2);

    AnalysisEngine ae1 = createEngine(aeDesc1);
    AnalysisEngine ae2 = createEngine(aeDesc2);
    ae1.process(ae1.newCAS());
    ae2.process(ae2.newCAS());

    AnalysisEngine ae3 = createEngine(createEngineDescription(aeDesc1, aeDesc2));
    ae3.process(ae3.newCAS());
  }

  /**
   * Test deeper nesting level.
   */
  @Test
  public void resource_testDeeperNesting() throws Exception {
    ExternalResourceDescription resDesc2 = createResourceDescription(
            TestExternalResource.class, TestExternalResource.PARAM_VALUE,
            TestExternalResource.EXPECTED_VALUE);

    ExternalResourceDescription resDesc = createResourceDescription(
            TestExternalResource2.class, TestExternalResource2.PARAM_RESOURCE, resDesc2,
            TestExternalResource.PARAM_VALUE, TestExternalResource.EXPECTED_VALUE);

    AnalysisEngineDescription aeDesc = saveLoad(createEngineDescription(
            TestAnalysisEngineWithResource.class,
            TestAnalysisEngineWithResource.PARAM_RESOURCE,
            createResourceDescription(TestExternalResource2.class,
                    TestExternalResource.PARAM_VALUE, TestExternalResource.EXPECTED_VALUE,
                    TestExternalResource2.PARAM_RESOURCE, resDesc)));

//    dumpResourceConfiguration(aeDesc);

    AnalysisEngine ae = createEngine(aeDesc);
    ae.process(ae.newCAS());
  }

  /**
   * Test self-injection
   */
  @Test
  public void resource_testSelfInjection() throws Exception {
    ExternalResourceDescription resDesc = createResourceDescription(
            TestExternalResource2.class, TestExternalResource.PARAM_VALUE,
            TestExternalResource.EXPECTED_VALUE);
    bindResourceOnce(resDesc, TestExternalResource2.PARAM_RESOURCE, resDesc);

    AnalysisEngineDescription aeDesc = saveLoad(createEngineDescription(
            TestAnalysisEngineWithResource.class, TestAnalysisEngineWithResource.PARAM_RESOURCE,
            resDesc));

//    dumpResourceConfiguration(aeDesc);

    AnalysisEngine ae = createEngine(aeDesc);
    ae.process(ae.newCAS());
  }

  /**
   * Test self-injection
   */
  @Test
  public void resource_testDoubleSelfInjection() throws Exception {
    ExternalResourceDescription resDesc = createResourceDescription(
            TestExternalResource2.class, TestExternalResource.PARAM_VALUE,
            TestExternalResource.EXPECTED_VALUE);
    bindResourceOnce(resDesc, TestExternalResource2.PARAM_RESOURCE, resDesc);

    AnalysisEngineDescription aeDesc1 = saveLoad(createEngineDescription(
            TestAnalysisEngineWithResource.class, TestAnalysisEngineWithResource.PARAM_RESOURCE,
            resDesc));

    AnalysisEngineDescription aeDesc2 = saveLoad(createEngineDescription(
            TestAnalysisEngineWithResource.class, TestAnalysisEngineWithResource.PARAM_RESOURCE,
            resDesc));

//    dumpResourceConfiguration(aeDesc1);
//    dumpResourceConfiguration(aeDesc2);

    AnalysisEngine ae1 = createEngine(aeDesc1);
    AnalysisEngine ae2 = createEngine(aeDesc2);
    ae1.process(ae1.newCAS());
    ae2.process(ae2.newCAS());

    AnalysisEngine ae3 = createEngine(createEngineDescription(aeDesc1, aeDesc2));
    ae3.process(ae3.newCAS());
  }

  /**
   * Test simple injection.
   */
  @Test
  public void sharedObject_testInjection() throws Exception {
    AnalysisEngineDescription aeDesc = saveLoad(createEngineDescription(
            TestAnalysisEngineWithSharedResourceObject.class,
            TestAnalysisEngineWithSharedResourceObject.PARAM_RESOURCE,
            createSharedResourceDescription("http://dumm.my", TestSharedResourceObject.class,
                    TestSharedResourceObject.PARAM_VALUE, TestSharedResourceObject.EXPECTED_VALUE)));

    AnalysisEngine ae = createEngine(aeDesc);
    ae.process(ae.newCAS());
  }

  /**
   * Test shared simple injection.
   */
  @Test
  public void sharedObject_testSharedInjection() throws Exception {
    ExternalResourceDescription resDesc = createSharedResourceDescription(
            "http://dumm.my", TestSharedResourceObject.class, TestSharedResourceObject.PARAM_VALUE,
            TestSharedResourceObject.EXPECTED_VALUE);

    AnalysisEngineDescription aeDesc1 = saveLoad(createEngineDescription(
            TestAnalysisEngineWithSharedResourceObject.class,
            TestAnalysisEngineWithSharedResourceObject.PARAM_RESOURCE, resDesc));

    AnalysisEngineDescription aeDesc2 = saveLoad(createEngineDescription(
            TestAnalysisEngineWithSharedResourceObject.class,
            TestAnalysisEngineWithSharedResourceObject.PARAM_RESOURCE, resDesc));

//    dumpResourceConfiguration(aeDesc1);
//    dumpResourceConfiguration(aeDesc2);

    AnalysisEngine ae1 = createEngine(aeDesc1);
    AnalysisEngine ae2 = createEngine(aeDesc2);
    ae1.process(ae1.newCAS());
    ae2.process(ae2.newCAS());

    AnalysisEngine ae3 = createEngine(createEngineDescription(aeDesc1, aeDesc2));
    ae3.process(ae3.newCAS());
  }

  /**
   * Test simple nesting.
   */
  @Test
  public void sharedObject_testSimpleNesting() throws Exception {
    AnalysisEngineDescription aeDesc = saveLoad(createEngineDescription(
            TestAnalysisEngineWithSharedResourceObject.class,
            TestAnalysisEngineWithSharedResourceObject.PARAM_RESOURCE,
            createSharedResourceDescription(
                    "http://dumm.my",
                    TestSharedResourceObject2.class,
                    TestSharedResourceObject2.PARAM_VALUE,
                    TestSharedResourceObject2.EXPECTED_VALUE,
                    TestSharedResourceObject2.PARAM_RESOURCE,
                    createSharedResourceDescription("http://dumm.my",
                            TestSharedResourceObject.class, TestSharedResourceObject.PARAM_VALUE,
                            TestSharedResourceObject.EXPECTED_VALUE))));

    AnalysisEngine ae = createEngine(aeDesc);
    ae.process(ae.newCAS());
  }

  /**
   * Test simple nesting.
   */
  @Test
  public void sharedObject_testSimpleNestingViaBind() throws Exception {
    ExternalResourceDescription res2 = createSharedResourceDescription(
            "http://dumm.my", TestSharedResourceObject.class, 
            TestSharedResourceObject.PARAM_VALUE, TestSharedResourceObject.EXPECTED_VALUE);

    ExternalResourceDescription res1 = createSharedResourceDescription(
            "http://dumm.my", TestSharedResourceObject2.class,
            TestSharedResourceObject2.PARAM_VALUE, TestSharedResourceObject2.EXPECTED_VALUE);

    bindResourceOnce(res1, TestSharedResourceObject2.PARAM_RESOURCE, res2);
    
    AnalysisEngineDescription aeDesc =createEngineDescription(
            TestAnalysisEngineWithSharedResourceObject.class,
            TestAnalysisEngineWithSharedResourceObject.PARAM_RESOURCE, res1);

    aeDesc = saveLoad(aeDesc);

    AnalysisEngine ae = createEngine(aeDesc);
    ae.process(ae.newCAS());
  }
  
  /**
   * Test self-injection
   */
  @Test
  public void sharedObject_testSelfInjection() throws Exception {
    ExternalResourceDescription resDesc = createSharedResourceDescription(
            "http://dumm.my", TestSharedResourceObject2.class,
            TestSharedResourceObject.PARAM_VALUE, TestSharedResourceObject.EXPECTED_VALUE);
    bindResourceOnce(resDesc, TestSharedResourceObject2.PARAM_RESOURCE, resDesc);

    AnalysisEngineDescription aeDesc = saveLoad(createEngineDescription(
            TestAnalysisEngineWithSharedResourceObject.class,
            TestAnalysisEngineWithSharedResourceObject.PARAM_RESOURCE, resDesc));

//    dumpResourceConfiguration(aeDesc);

    AnalysisEngine ae = createEngine(aeDesc);
    ae.process(ae.newCAS());
  }

  public static class TestExternalResource2 extends TestExternalResource {
    public final static String PARAM_RESOURCE = "resource2";

    @ExternalResource(key = PARAM_RESOURCE)
    private TestExternalResource resource;

    @Override
    public void afterResourcesInitialized() {
//      System.out.println(getClass().getSimpleName() + ".afterResourcesInitialized()");
      // Ensure the External Resource is bound
      assertNotNull(resource);
      if (this != resource) {
        resource.assertConfiguredOk();
      }
      assertConfiguredOk();
    }
  }

  public static class TestSharedResourceObject2 extends TestSharedResourceObject implements
          ExternalResourceAware {
    public final static String PARAM_RESOURCE = "resource2";

    @ExternalResource(key = PARAM_RESOURCE)
    private TestSharedResourceObject resource;

    @ConfigurationParameter(name = ExternalResourceFactory.PARAM_RESOURCE_NAME)
    private String resourceName;

    @Override
    public void afterResourcesInitialized() {
//      System.out.println(getClass().getSimpleName() + ".afterResourcesInitialized()");
      // Ensure the External Resource is bound
      assertNotNull(resource);
      if (this != resource) {
        resource.assertConfiguredOk();
      }
      assertConfiguredOk();
    }

    @Override
    public String getResourceName() {
      return resourceName;
    }
  }

  public static class TestAnalysisEngineWithResource extends CasAnnotator_ImplBase {

    public final static String PARAM_RESOURCE = "resource";

    @ExternalResource(key = PARAM_RESOURCE)
    private TestExternalResource resource;

    @Override
    public void process(CAS aCAS) throws AnalysisEngineProcessException {
//      System.out.println(getClass().getSimpleName() + ".process()");
      assertNotNull(resource);
      resource.assertConfiguredOk();
    }
  }

  public static class TestAnalysisEngineWithSharedResourceObject extends CasAnnotator_ImplBase {

    public final static String PARAM_RESOURCE = "resource";

    @ExternalResource(key = PARAM_RESOURCE)
    private TestSharedResourceObject resource;

    @Override
    public void process(CAS aCAS) throws AnalysisEngineProcessException {
//      System.out.println(getClass().getSimpleName() + ".process()");
      assertNotNull(resource);
      resource.assertConfiguredOk();
    }
  }

  AnalysisEngineDescription saveLoad(AnalysisEngineDescription aDesc) throws InvalidXMLException,
          SAXException, IOException {
    ByteArrayOutputStream bos = new ByteArrayOutputStream();
    aDesc.toXML(bos);
    return UIMAFramework.getXMLParser().parseAnalysisEngineDescription(
            new XMLInputSource(new ByteArrayInputStream(bos.toByteArray()), null));
  }

//  private void dumpResourceConfiguration(ResourceCreationSpecifier aSpec) {
//    System.out.println("-- begin resource configuration");
//    for (ExternalResourceBinding b : aSpec.getResourceManagerConfiguration()
//            .getExternalResourceBindings()) {
//      System.out.printf("Binding : %s -> %s %n", b.getKey(), b.getResourceName());
//    }
//
//    for (ExternalResourceDescription r : aSpec.getResourceManagerConfiguration()
//            .getExternalResources()) {
//      if (r.getImplementationName() != null) {
//        System.out.printf("Resource: %s -> %s %n", r.getName(), r.getImplementationName());
//      } else {
//        System.out.printf("Resource: %s -> %s %n", r.getName(),
//                ((CustomResourceSpecifier) r.getResourceSpecifier()).getResourceClassName());
//      }
//    }
//    System.out.println("-- end resource configuration");
//  }

  @Rule
  public TestName name = new TestName();

  @Before
  public void printSeparator() {
    System.out.println("\n=== " + name.getMethodName() + " =====================");
  }
}