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/*
 * Copyright (c) 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016 David Berkman
 * 
 * This file is part of the SmallMind Code Project.
 * 
 * The SmallMind Code Project is free software, you can redistribute
 * it and/or modify it under either, at your discretion...
 * 
 * 1) The terms of GNU Affero General Public License as published by the
 * Free Software Foundation, either version 3 of the License, or (at
 * your option) any later version.
 * 
 * ...or...
 * 
 * 2) The terms of the Apache License, Version 2.0.
 * 
 * The SmallMind Code Project is distributed in the hope that it will
 * be useful, but WITHOUT ANY WARRANTY; without even the implied warranty
 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License or Apache License for more details.
 * 
 * You should have received a copy of the GNU Affero General Public License
 * and the Apache License along with the SmallMind Code Project. If not, see
 *  or .
 * 
 * Additional permission under the GNU Affero GPL version 3 section 7
 * ------------------------------------------------------------------
 * If you modify this Program, or any covered work, by linking or
 * combining it with other code, such other code is not for that reason
 * alone subject to any of the requirements of the GNU Affero GPL
 * version 3.
 */
package org.smallmind.scribe.pen.probe;

import java.util.LinkedList;
import org.smallmind.nutsnbolts.util.SnowflakeId;
import org.smallmind.scribe.pen.Discriminator;
import org.smallmind.scribe.pen.Level;
import org.smallmind.scribe.pen.Logger;

public class ProbeStack {

  private LinkedList probeList;
  private byte[] threadIdentifier;
  private byte[] parentIdentifier;
  private int instance = 0;

  public ProbeStack (byte[] parentIdentifier) {

    this.parentIdentifier = parentIdentifier;

    threadIdentifier = SnowflakeId.newInstance().asByteArray();
    probeList = new LinkedList();
  }

  public byte[] getCurrentIdentifier () {

    if (probeList.isEmpty()) {

      return null;
    }

    return probeList.getFirst().getCorrelator().getIdentifier();
  }

  public Probe peek () {

    if (probeList.isEmpty()) {

      return null;
    }

    return probeList.getFirst();
  }

  public Probe push (Logger logger, Discriminator discriminator, Level level, String title) {

    Probe probe;

    probeList.addFirst(probe = new Probe(logger, discriminator, level, new Correlator(threadIdentifier, probeList.isEmpty() ? parentIdentifier : probeList.getFirst().getCorrelator().getIdentifier(), SnowflakeId.newInstance().asByteArray(), probeList.size(), instance++), title, probeList.isEmpty()));

    return probe;
  }

  public void pop (Probe probe)
    throws ProbeException {

    if (!probe.equals(probeList.getFirst())) {
      throw new ProbeException("Out of order Probe(%s) termination", probe.getCorrelator().getIdentifier());
    }

    probeList.removeFirst();
  }
}