// Copyright 2014 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.events;

import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Sets;
import java.util.EnumSet;

/** Indicates the kind of an {@link Event}. */
public enum EventKind {

  /**
   * An unrecoverable error resulting in abrupt termination of the server.
   *
   * <p>Events of this kind may be crash bugs (i.e. {@link RuntimeException}) or other errors such
   * {@link OutOfMemoryError}. The only time such an event should be emitted is just prior to
   * crashing. It should be the final event presented to the user before terminating.
   */
  FATAL,

  /**
   * For errors that will prevent a successful, correct build. In general, the build tool will not
   * attempt to start or continue a build if an error is encountered (though the behavior specified
   * by {@code --keep_going} is a counterexample).
   *
   * <p>Errors of a more severe nature in the input, such as those which might cause later passes of
   * the analysis to fail catastrophically, should be handled by throwing an exception.
   */
  ERROR,

  /** For warnings of minor problems that do not affect the integrity of a build. */
  WARNING,

  /**
   * For atemporal information that is true throughout the entire duration of a build (e.g. the
   * number of targets found).
   */
  INFO,

  /**
   * For temporal information that changes during the duration of a build (e.g. what action is
   * executing now).
   */
  PROGRESS,

  /** For debug messages. */
  DEBUG,

  // For progress messages (temporal information) relating to the start and end of particular tasks
  // (e.g. "Loading package foo", "Compiling bar", etc.).
  /** Beginning of a temporal task. */
  START,
  /** End of a temporal task. */
  FINISH,

  /** For command lines of subcommands executed by the build tool (like make-dbg "-v"). */
  SUBCOMMAND,

  // Output to stdout/stderr from subprocesses.
  /** Output to stdout from subprocess. */
  STDOUT,
  /** Output to stderr from subprocess. */
  STDERR,

  // Test result messages (similar to the INFO and ERROR, but test-specific)
  /** Test passed. */
  PASS,
  /** Test failed. */
  FAIL,
  /** Test timed out. */
  TIMEOUT,
  /** Test cancelled. */
  CANCELLED,

  /** For the reasoning of the dependency checker (like GNU Make "-d"). */
  DEPCHECKER;

  public static final ImmutableSet<EventKind> ALL_EVENTS =
      Sets.immutableEnumSet(EnumSet.allOf(EventKind.class));

  public static final ImmutableSet<EventKind> OUTPUT =
      Sets.immutableEnumSet(EventKind.STDOUT, EventKind.STDERR);

  public static final ImmutableSet<EventKind> ERRORS =
      Sets.immutableEnumSet(EventKind.FATAL, EventKind.ERROR, EventKind.FAIL, EventKind.TIMEOUT);

  public static final ImmutableSet<EventKind> ERRORS_AND_WARNINGS =
      Sets.immutableEnumSet(
          EventKind.FATAL,
          EventKind.ERROR,
          EventKind.WARNING,
          EventKind.DEBUG,
          EventKind.FAIL,
          EventKind.TIMEOUT);

  public static final ImmutableSet<EventKind> ERRORS_WARNINGS_AND_INFO =
      Sets.immutableEnumSet(
          EventKind.FATAL,
          EventKind.ERROR,
          EventKind.WARNING,
          EventKind.DEBUG,
          EventKind.PASS,
          EventKind.FAIL,
          EventKind.TIMEOUT,
          EventKind.INFO);

  public static final ImmutableSet<EventKind> ERRORS_AND_OUTPUT =
      Sets.immutableEnumSet(
          EventKind.FATAL,
          EventKind.ERROR,
          EventKind.FAIL,
          EventKind.TIMEOUT,
          EventKind.STDOUT,
          EventKind.STDERR);

  public static final ImmutableSet<EventKind> ERRORS_AND_WARNINGS_AND_OUTPUT =
      Sets.immutableEnumSet(
          EventKind.FATAL,
          EventKind.ERROR,
          EventKind.WARNING,
          EventKind.DEBUG,
          EventKind.FAIL,
          EventKind.TIMEOUT,
          EventKind.STDOUT,
          EventKind.STDERR);
}