/*
 * Copyright 2014-present Facebook, 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 com.facebook.buck.cli;

import com.facebook.buck.log.ConsoleHandler;
import com.facebook.buck.util.Verbosity;
import com.google.common.base.Optional;

import java.util.logging.Level;

/**
 * Temporarily overrides the console log level to match a verbosity
 * flag passed from the command-line.
 */
public class ConsoleLogLevelOverrider implements AutoCloseable {

  private final String commandId;
  private final Optional<ConsoleHandler> consoleHandler;
  private final boolean shouldUnregister;

  public ConsoleLogLevelOverrider(String commandId, Verbosity verbosity) {
    this.commandId = commandId;
    consoleHandler = JavaUtilLogHandlers.getConsoleHandler();
    if (consoleHandler.isPresent() &&
        verbosity == Verbosity.ALL) {
      consoleHandler.get().registerLogLevel(this.commandId, Level.ALL);
      shouldUnregister = true;
    } else {
      shouldUnregister = false;
    }
  }

  @Override
  public void close() {
    if (consoleHandler.isPresent() && shouldUnregister) {
      consoleHandler.get().unregisterLogLevel(commandId);
    }
  }
}