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/*
 * Copyright (c) 2014 Spotify AB.
 *
 * 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.spotify.helios.master;

import com.google.common.annotations.VisibleForTesting;

import com.spotify.helios.common.LoggingConfig;
import com.spotify.helios.servicescommon.ServiceMain;
import com.spotify.helios.servicescommon.coordination.CuratorClientFactory;
import com.spotify.helios.servicescommon.coordination.CuratorClientFactoryImpl;

import net.sourceforge.argparse4j.inf.ArgumentParserException;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.Map;

/**
 * Instantiates and runs the helios master. We do our own bootstrapping instead of using
 * {@link io.dropwizard.setup.Bootstrap} because we want more control over logging etc.
 */
public class MasterMain extends ServiceMain {

  private static final Logger log = LoggerFactory.getLogger(MasterMain.class);

  private final MasterConfig masterConfig;
  private final CuratorClientFactory curatorClientFactory;
  private final Map environmentVariables;
  private MasterService service;

  public MasterMain(final String[] args) throws ArgumentParserException {
    this(new CuratorClientFactoryImpl(), new MasterParser(args), System.getenv());
  }

  /**
   * Allows mock environment variables to be passed in for testing purposes.
   * @param environmentVariables Env vars
   * @param args args
   * @throws ArgumentParserException If we cannot parse an argument.
   */
  @VisibleForTesting
  public MasterMain(Map environmentVariables, final String[] args)
      throws ArgumentParserException {

    this(new CuratorClientFactoryImpl(), new MasterParser(args), environmentVariables);
  }

  public MasterMain(final CuratorClientFactory curatorClientFactory,
                    final String[] args) throws ArgumentParserException {
    this(curatorClientFactory, new MasterParser(args), System.getenv());
  }

  public MasterMain(final CuratorClientFactory curatorClientFactory,
                    final MasterParser parser,
                    final Map environmentVariables) {
    this(curatorClientFactory,
        parser.getMasterConfig(),
        parser.getLoggingConfig(),
        environmentVariables);
  }

  public MasterMain(final CuratorClientFactory curatorClientFactory,
                    final MasterConfig masterConfig,
                    final LoggingConfig loggingConfig,
                    final Map environmentVariables) {
    super(loggingConfig, masterConfig.getSentryDsn());
    this.masterConfig = masterConfig;
    this.curatorClientFactory = curatorClientFactory;
    this.environmentVariables = environmentVariables;
  }

  @Override
  protected void startUp() throws Exception {
    service = new MasterService(masterConfig,
        createEnvironment("helios-master"),
        curatorClientFactory,
        environmentVariables);
    service.startAsync().awaitRunning();
  }

  @Override
  protected void shutDown() throws Exception {
    service.stopAsync().awaitTerminated();
  }

  public static void main(final String... args) {
    try {
      final MasterMain main = new MasterMain(args);
      main.startAsync().awaitRunning();
      main.awaitTerminated();
    } catch (Throwable e) {
      log.error("Uncaught exception", e);
      System.exit(1);
    }
    // Ensure we exit even if there's lingering non-daemon threads
    System.exit(0);
  }
}