/**
    * Copyright 2014 Netflix, 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 rx.internal.operators;
  
  import static org.mockito.Matchers.any;
  import static org.mockito.Mockito.mock;
  import static org.mockito.Mockito.times;
  import static org.mockito.Mockito.verify;
  
  import java.util.concurrent.CountDownLatch;
  
  import org.junit.Test;
  import org.mockito.Mockito;
  
  import rx.Observable;
  import rx.Observer;
  import rx.functions.Func1;
  import rx.internal.util.RxRingBuffer;
  import rx.observers.TestSubscriber;
  
  public class OperatorFilterTest {
  
      @Test
      public void testFilter() {
          Observable<String> w = Observable.just("one", "two", "three");
          Observable<String> observable = w.filter(new Func1<String, Boolean>() {
  
              @Override
              public Boolean call(String t1) {
                  return t1.equals("two");
              }
          });
  
          @SuppressWarnings("unchecked")
          Observer<String> observer = mock(Observer.class);
          observable.subscribe(observer);
          verify(observer, Mockito.never()).onNext("one");
          verify(observer, times(1)).onNext("two");
          verify(observer, Mockito.never()).onNext("three");
          verify(observer, Mockito.never()).onError(any(Throwable.class));
          verify(observer, times(1)).onCompleted();
      }
  
      /**
       * Make sure we are adjusting subscriber.request() for filtered items
       */
      @Test(timeout = 500)
      public void testWithBackpressure() throws InterruptedException {
          Observable<String> w = Observable.just("one", "two", "three");
          Observable<String> o = w.filter(new Func1<String, Boolean>() {
  
              @Override
              public Boolean call(String t1) {
                  return t1.equals("three");
              }
          });
  
          final CountDownLatch latch = new CountDownLatch(1);
          TestSubscriber<String> ts = new TestSubscriber<String>() {
  
              @Override
              public void onCompleted() {
                  System.out.println("onCompleted");
                  latch.countDown();
              }
  
              @Override
              public void onError(Throwable e) {
                  e.printStackTrace();
                  latch.countDown();
              }
  
              @Override
              public void onNext(String t) {
                  System.out.println("Received: " + t);
                  // request more each time we receive
                  request(1);
              }
  
          };
          // this means it will only request "one" and "two", expecting to receive them before requesting more
          ts.requestMore(2);
  
          o.subscribe(ts);
  
          // this will wait forever unless OperatorTake handles the request(n) on filtered items
         latch.await();
     }
 
     /**
      * Make sure we are adjusting subscriber.request() for filtered items
      */
     @Test(timeout = 500000)
     public void testWithBackpressure2() throws InterruptedException {
         Observable<Integer> w = Observable.range(1, RxRingBuffer.SIZE * 2);
         Observable<Integer> o = w.filter(new Func1<Integer, Boolean>() {
 
             @Override
             public Boolean call(Integer t1) {
                 return t1 > 100;
             }
         });
 
         final CountDownLatch latch = new CountDownLatch(1);
         final TestSubscriber<Integer> ts = new TestSubscriber<Integer>() {
             
             @Override
             public void onCompleted() {
                 System.out.println("onCompleted");
                 latch.countDown();
             }
             
             @Override
             public void onError(Throwable e) {
                 e.printStackTrace();
                 latch.countDown();
             }
             
             @Override
             public void onNext(Integer t) {
                 System.out.println("Received: " + t);
                 // request more each time we receive
                 request(1);
             }
         };
         // this means it will only request 1 item and expect to receive more
         ts.requestMore(1);
 
         o.subscribe(ts);
 
         // this will wait forever unless OperatorTake handles the request(n) on filtered items
         latch.await();
     }
 }