// 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.exec;

import static com.google.common.base.Preconditions.checkArgument;

import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Preconditions;
import com.google.devtools.build.lib.actions.Action;
import com.google.devtools.build.lib.actions.ActionExecutionException;
import com.google.devtools.build.lib.actions.ExecException;
import com.google.devtools.build.lib.actions.SpawnResult;
import com.google.devtools.build.lib.actions.SpawnResult.Status;
import com.google.devtools.build.lib.server.FailureDetails.FailureDetail;
import com.google.devtools.build.lib.server.FailureDetails.Spawn;
import com.google.devtools.build.lib.server.FailureDetails.Spawn.Code;
import com.google.devtools.build.lib.util.DetailedExitCode;
import com.google.devtools.build.lib.util.ExitCode;

/**
 * A specialization of {@link ExecException} that indicates something went wrong when trying to
 * execute a {@link com.google.devtools.build.lib.actions.Spawn}.
 */
public class SpawnExecException extends ExecException {
  protected final SpawnResult result;
  protected final boolean forciblyRunRemotely;

  public SpawnExecException(String message, SpawnResult result, boolean forciblyRunRemotely) {
    super(message, result.isCatastrophe());
    checkArgument(
        !Status.SUCCESS.equals(result.status()),
        "Can't create exception with successful spawn result.");
    this.result = Preconditions.checkNotNull(result);
    this.forciblyRunRemotely = forciblyRunRemotely;
  }

  @VisibleForTesting
  public SpawnExecException(
      String message, SpawnResult result, boolean forciblyRunRemotely, boolean catastrophe) {
    super(message, catastrophe);
    this.result = Preconditions.checkNotNull(result);
    this.forciblyRunRemotely = forciblyRunRemotely;
  }

  /** Returns the spawn result. */
  public SpawnResult getSpawnResult() {
    return result;
  }

  public boolean hasTimedOut() {
    return getSpawnResult().status() == Status.TIMEOUT;
  }

  @Override
  public ActionExecutionException toActionExecutionException(
      String messagePrefix, boolean verboseFailures, Action action) {
    if (messagePrefix == null) {
      messagePrefix = action.describe();
    }
    String message =
        result.getDetailMessage(
            messagePrefix, getMessage(), verboseFailures, isCatastrophic(), forciblyRunRemotely);
    return new ActionExecutionException(
        message, this, action, isCatastrophic(), getDetailedExitCode());
  }

  /** Return detailed exit code depending on the spawn result. */
  private DetailedExitCode getDetailedExitCode() {
    ExitCode exitCode =
        result.status().isConsideredUserError() ? ExitCode.BUILD_FAILURE : ExitCode.REMOTE_ERROR;
    if (result.failureDetail() == null) {
      return DetailedExitCode.of(
          exitCode,
          FailureDetail.newBuilder()
              .setMessage("spawn failed")
              .setSpawn(Spawn.newBuilder().setCode(Code.UNSPECIFIED_EXECUTION_FAILURE))
              .build());
    }
    return DetailedExitCode.of(exitCode, result.failureDetail());
  }
}
