// Copyright 2023 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.remote;

import static com.google.common.truth.Truth.assertThat;
import static java.util.concurrent.TimeUnit.SECONDS;
import static org.junit.Assert.assertThrows;

import build.bazel.remote.execution.v2.ExecuteResponse;
import com.google.common.util.concurrent.ListeningScheduledExecutorService;
import com.google.common.util.concurrent.MoreExecutors;
import com.google.devtools.build.lib.authandtls.CallCredentialsProvider;
import com.google.devtools.build.lib.remote.RemoteRetrier.ExponentialBackoff;
import com.google.devtools.build.lib.remote.common.OperationObserver;
import com.google.devtools.build.lib.remote.common.RemoteExecutionClient;
import com.google.devtools.build.lib.remote.util.TestUtils;
import com.google.rpc.Code;
import java.io.IOException;
import java.util.concurrent.Executors;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

/** Tests for {@link GrpcRemoteExecutor}. */
@RunWith(JUnit4.class)
public class GrpcRemoteExecutorTest extends GrpcRemoteExecutorTestBase {
  private ListeningScheduledExecutorService retryService;

  @Override
  public void setUp() throws Exception {
    retryService = MoreExecutors.listeningDecorator(Executors.newScheduledThreadPool(1));
    super.setUp();
  }

  @Override
  protected RemoteExecutionClient createExecutionService(ReferenceCountedChannel channel) {
    RemoteRetrier retrier =
        TestUtils.newRemoteRetrier(
            () -> new ExponentialBackoff(remoteOptions),
            RemoteRetrier.RETRIABLE_GRPC_EXEC_ERRORS,
            retryService);

    return new GrpcRemoteExecutor(channel, CallCredentialsProvider.NO_CREDENTIALS, retrier);
  }

  @Override
  public void tearDown() throws Exception {
    retryService.shutdownNow();
    retryService.awaitTermination(
        com.google.devtools.build.lib.testutil.TestUtils.WAIT_TIMEOUT_SECONDS, SECONDS);
    super.tearDown();
  }

  @Test
  public void executeRemotely_operationWithoutResult_crashes() {
    executionService.whenExecute(DUMMY_REQUEST).thenDone();

    assertThrows(
        IllegalStateException.class,
        () -> executor.executeRemotely(context, DUMMY_REQUEST, OperationObserver.NO_OP));
    // Shouldn't retry in this case
    assertThat(executionService.getExecTimes()).isEqualTo(1);
  }

  @Test
  public void executeRemotely_responseWithoutResult_crashes() {
    executionService.whenExecute(DUMMY_REQUEST).thenDone(ExecuteResponse.getDefaultInstance());

    assertThrows(
        IllegalStateException.class,
        () -> executor.executeRemotely(context, DUMMY_REQUEST, OperationObserver.NO_OP));

    assertThat(executionService.getExecTimes()).isEqualTo(1);
  }

  @Test
  public void executeRemotely_retryWaitExecutionWhenUnauthenticated()
      throws IOException, InterruptedException {
    executionService.whenExecute(DUMMY_REQUEST).thenAck().finish();
    executionService.whenWaitExecution(DUMMY_REQUEST).thenAck().thenError(Code.UNAUTHENTICATED);
    executionService.whenExecute(DUMMY_REQUEST).thenAck().thenDone(DUMMY_RESPONSE);

    ExecuteResponse response =
        executor.executeRemotely(context, DUMMY_REQUEST, OperationObserver.NO_OP);

    assertThat(executionService.getExecTimes()).isEqualTo(2);
    assertThat(executionService.getWaitTimes()).isEqualTo(1);
    assertThat(response).isEqualTo(DUMMY_RESPONSE);
  }
}