/**
 * 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.observers;

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

import java.lang.reflect.Method;
import java.util.concurrent.atomic.AtomicInteger;

import org.junit.After;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;

import rx.exceptions.OnCompletedFailedException;
import rx.exceptions.OnErrorFailedException;
import rx.exceptions.OnErrorNotImplementedException;
import rx.exceptions.TestException;
import rx.exceptions.UnsubscribeFailedException;
import rx.functions.Action0;
import rx.plugins.RxJavaErrorHandler;
import rx.plugins.RxJavaPlugins;
import rx.subscriptions.Subscriptions;

public class SafeSubscriberTest {
    
    @Before
    @After
    public void resetBefore() {
        RxJavaPlugins ps = RxJavaPlugins.getInstance();
        
        try {
            Method m = ps.getClass().getDeclaredMethod("reset");
            m.setAccessible(true);
            m.invoke(ps);
        } catch (Throwable ex) {
            ex.printStackTrace();
        }
    }

    @Test
    public void testOnCompletedThrows() {
        TestSubscriber<Integer> ts = new TestSubscriber<Integer>() {
            @Override
            public void onCompleted() {
                throw new TestException();
            }
        };
        SafeSubscriber<Integer> safe = new SafeSubscriber<Integer>(ts);
        try {
            safe.onCompleted();
            Assert.fail();
        } catch (OnCompletedFailedException e) {
            assertTrue(safe.isUnsubscribed());
        }
    }
    
    @Test
    public void testOnCompletedThrows2() {
        TestSubscriber<Integer> ts = new TestSubscriber<Integer>() {
            @Override
            public void onCompleted() {
                throw new OnErrorNotImplementedException(new TestException());
            }
        };
        SafeSubscriber<Integer> safe = new SafeSubscriber<Integer>(ts);
        
        try {
            safe.onCompleted();
        } catch (OnErrorNotImplementedException ex) {
            // expected
        }
        
        assertTrue(safe.isUnsubscribed());
    }
    
    @Test(expected=OnCompletedFailedException.class)
    public void testPluginException() {
        RxJavaPlugins.getInstance().registerErrorHandler(new RxJavaErrorHandler() {
            @Override
            public void handleError(Throwable e) {
                throw new RuntimeException();
            }
        });
        
        TestSubscriber<Integer> ts = new TestSubscriber<Integer>() {
            @Override
            public void onCompleted() {
                throw new TestException();
            }
        };
        SafeSubscriber<Integer> safe = new SafeSubscriber<Integer>(ts);
        
        safe.onCompleted();
    }
    
    @Test(expected = OnErrorFailedException.class)
    public void testPluginExceptionWhileOnErrorUnsubscribeThrows() {
        RxJavaPlugins.getInstance().registerErrorHandler(new RxJavaErrorHandler() {
            int calls;
            @Override
            public void handleError(Throwable e) {
                if (++calls == 2) {
                    throw new RuntimeException();
                }
            }
        });
        
        TestSubscriber<Integer> ts = new TestSubscriber<Integer>();
        SafeSubscriber<Integer> safe = new SafeSubscriber<Integer>(ts);
        safe.add(Subscriptions.create(new Action0() {
            @Override
            public void call() {
                throw new RuntimeException();
            }
        }));
        
        safe.onError(new TestException());
    }
    
    @Test(expected = RuntimeException.class)
    public void testPluginExceptionWhileOnErrorThrowsNotImplAndUnsubscribeThrows() {
        RxJavaPlugins.getInstance().registerErrorHandler(new RxJavaErrorHandler() {
            int calls;
            @Override
            public void handleError(Throwable e) {
                if (++calls == 2) {
                    throw new RuntimeException();
                }
            }
        });
        
        TestSubscriber<Integer> ts = new TestSubscriber<Integer>() {
            @Override
            public void onError(Throwable e) {
                throw new OnErrorNotImplementedException(e);
            }
        };
        SafeSubscriber<Integer> safe = new SafeSubscriber<Integer>(ts);
        safe.add(Subscriptions.create(new Action0() {
            @Override
            public void call() {
                throw new RuntimeException();
            }
        }));
        
        safe.onError(new TestException());
    }
    
    @Test(expected = OnErrorFailedException.class)
    public void testPluginExceptionWhileOnErrorThrows() {
        RxJavaPlugins.getInstance().registerErrorHandler(new RxJavaErrorHandler() {
            int calls;
            @Override
            public void handleError(Throwable e) {
                if (++calls == 2) {
                    throw new RuntimeException();
                }
            }
        });
        
        TestSubscriber<Integer> ts = new TestSubscriber<Integer>() {
            @Override
            public void onError(Throwable e) {
                throw new RuntimeException(e);
            }
        };
        SafeSubscriber<Integer> safe = new SafeSubscriber<Integer>(ts);
        
        safe.onError(new TestException());
    }
    @Test(expected = OnErrorFailedException.class)
    public void testPluginExceptionWhileOnErrorThrowsAndUnsubscribeThrows() {
        RxJavaPlugins.getInstance().registerErrorHandler(new RxJavaErrorHandler() {
            int calls;
            @Override
            public void handleError(Throwable e) {
                if (++calls == 2) {
                    throw new RuntimeException();
                }
            }
        });
        
        TestSubscriber<Integer> ts = new TestSubscriber<Integer>() {
            @Override
            public void onError(Throwable e) {
                throw new RuntimeException(e);
            }
        };
        SafeSubscriber<Integer> safe = new SafeSubscriber<Integer>(ts);
        safe.add(Subscriptions.create(new Action0() {
            @Override
            public void call() {
                throw new RuntimeException();
            }
        }));
        
        safe.onError(new TestException());
    }
    @Test(expected = OnErrorFailedException.class)
    public void testPluginExceptionWhenUnsubscribing2() {
        RxJavaPlugins.getInstance().registerErrorHandler(new RxJavaErrorHandler() {
            int calls;
            @Override
            public void handleError(Throwable e) {
                if (++calls == 3) {
                    throw new RuntimeException();
                }
            }
        });
        
        TestSubscriber<Integer> ts = new TestSubscriber<Integer>() {
            @Override
            public void onError(Throwable e) {
                throw new RuntimeException(e);
            }
        };
        SafeSubscriber<Integer> safe = new SafeSubscriber<Integer>(ts);
        safe.add(Subscriptions.create(new Action0() {
            @Override
            public void call() {
                throw new RuntimeException();
            }
        }));
        
        safe.onError(new TestException());
    }
    
    @Test
    public void testPluginErrorHandlerReceivesExceptionWhenUnsubscribeAfterCompletionThrows() {
        final AtomicInteger calls = new AtomicInteger();
        RxJavaPlugins.getInstance().registerErrorHandler(new RxJavaErrorHandler() {
            @Override
            public void handleError(Throwable e) {
                calls.incrementAndGet();
            }
        });
        
        final AtomicInteger errors = new AtomicInteger();
        TestSubscriber<Integer> ts = new TestSubscriber<Integer>() {
            @Override
            public void onError(Throwable e) {
                errors.incrementAndGet();
            }
        };
        final RuntimeException ex = new RuntimeException();
        SafeSubscriber<Integer> safe = new SafeSubscriber<Integer>(ts);
        safe.add(Subscriptions.create(new Action0() {
            @Override
            public void call() {
                throw ex;
            }
        }));
        
        try {
            safe.onCompleted();
            Assert.fail();
        } catch(UnsubscribeFailedException e) {
            assertEquals(1, (int) calls.get());
            assertEquals(0, (int) errors.get());
        }
    }

    @Test
    public void testPluginErrorHandlerReceivesExceptionFromFailingUnsubscribeAfterCompletionThrows() {
        final AtomicInteger calls = new AtomicInteger();
        RxJavaPlugins.getInstance().registerErrorHandler(new RxJavaErrorHandler() {
            @Override
            public void handleError(Throwable e) {
                calls.incrementAndGet();
            }
        });
        
        final AtomicInteger errors = new AtomicInteger();
        TestSubscriber<Integer> ts = new TestSubscriber<Integer>() {
            
            @Override 
            public void onCompleted() {
                throw new RuntimeException();
            }
            
            @Override
            public void onError(Throwable e) {
                errors.incrementAndGet();
            }
        };
        SafeSubscriber<Integer> safe = new SafeSubscriber<Integer>(ts);
        safe.add(Subscriptions.create(new Action0() {
            @Override
            public void call() {
                throw new RuntimeException();
            }
        }));
        
        try {
            safe.onCompleted();
            Assert.fail();
        } catch(UnsubscribeFailedException e) {
            assertEquals(2, (int) calls.get());
            assertEquals(0, (int) errors.get());
        }
    }

    
}
