// Copyright 2017 The Bazel Authors. All rights reserved.
//
// 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 com.google.devtools.build.lib.buildeventservice;

import static com.google.common.truth.Truth.assertThat;
import static org.mockito.Matchers.any;
import static org.mockito.Mockito.when;

import com.google.devtools.build.lib.buildeventservice.client.BuildEventServiceGrpcClient;
import com.google.devtools.build.lib.buildeventservice.client.UnmanagedBuildEventServiceGrpcClient;
import com.google.devtools.build.v1.PublishBuildEventGrpc;
import com.google.devtools.build.v1.PublishBuildEventGrpc.PublishBuildEventStub;
import com.google.devtools.build.v1.PublishBuildToolEventStreamRequest;
import com.google.devtools.build.v1.PublishBuildToolEventStreamResponse;
import io.grpc.ManagedChannel;
import io.grpc.Status;
import io.grpc.StatusException;
import io.grpc.inprocess.InProcessChannelBuilder;
import io.grpc.inprocess.InProcessServerBuilder;
import io.grpc.stub.StreamObserver;
import java.io.IOException;
import java.util.UUID;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
import org.mockito.Mock;
import org.mockito.Mockito;
import org.mockito.MockitoAnnotations;

/** Tests {@link BuildEventServiceGrpcClient}. */
@RunWith(JUnit4.class)
public class BuildEventServiceGrpcClientTest {

  private BuildEventServiceGrpcClient grpcClient;

  @Mock private PublishBuildEventGrpc.PublishBuildEventImplBase fakeServer;

  private static final StreamObserver<PublishBuildToolEventStreamRequest> NULL_OBSERVER =
      new StreamObserver<PublishBuildToolEventStreamRequest>() {
        @Override
        public void onNext(PublishBuildToolEventStreamRequest value) {}

        @Override
        public void onError(Throwable t) {}

        @Override
        public void onCompleted() {}
      };

  @Before
  public void setUp() throws IOException {
    MockitoAnnotations.initMocks(this);
    String uniqueName = UUID.randomUUID().toString();
    InProcessServerBuilder.forName(uniqueName)
        .directExecutor()
        .addService(fakeServer)
        .build()
        .start();

    ManagedChannel channel = InProcessChannelBuilder.forName(uniqueName).directExecutor().build();

    PublishBuildEventStub stub = PublishBuildEventGrpc.newStub(channel);
    grpcClient = new UnmanagedBuildEventServiceGrpcClient(stub, null);
  }

  @After
  public void tearDown() {
    Mockito.validateMockitoUsage();
  }

  @Test
  @SuppressWarnings("unchecked")
  public void testImmediateSuccess() throws Exception {
    when(fakeServer.publishBuildToolEventStream(any()))
        .thenAnswer(
            invocation -> {
              StreamObserver<PublishBuildToolEventStreamResponse> responseObserver =
                  (StreamObserver<PublishBuildToolEventStreamResponse>)
                      invocation.getArguments()[0];
              responseObserver.onCompleted();
              return NULL_OBSERVER;
            });
    assertThat(grpcClient.openStream(ack -> {}).getStatus().get()).isEqualTo(Status.OK);
  }

  @Test
  @SuppressWarnings("unchecked")
  public void testImmediateFailure() throws Exception {
    Throwable failure = new StatusException(Status.INTERNAL);
    when(fakeServer.publishBuildToolEventStream(any()))
        .thenAnswer(
            invocation -> {
              StreamObserver<PublishBuildToolEventStreamResponse> responseObserver =
                  (StreamObserver<PublishBuildToolEventStreamResponse>)
                      invocation.getArguments()[0];
              responseObserver.onError(failure);
              return NULL_OBSERVER;
            });
    assertThat(grpcClient.openStream(ack -> {}).getStatus().get()).isEqualTo(Status.INTERNAL);
  }
}