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// Licensed to the Software Freedom Conservancy (SFC) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The SFC licenses this file
// to you 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 org.openqa.grid.internal;

import net.jcip.annotations.ThreadSafe;

import org.openqa.grid.common.exception.GridException;

import java.util.Collections;
import java.util.Map;
import java.util.Queue;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.concurrent.CopyOnWriteArraySet;
import java.util.logging.Logger;

/**
 * The set of active test sessions.
 */
@ThreadSafe
public class ActiveTestSessions {

  private static final Logger log = Logger.getLogger(ActiveTestSessions.class.getName());

  private final Set activeTestSessions = new CopyOnWriteArraySet<>();

  private final
  Queue
      terminatedSessions =
      new ConcurrentLinkedQueue<>();
  private final
  Map
      reasons =
      new ConcurrentHashMap<>();


  public boolean add(TestSession testSession) {
    final boolean added = activeTestSessions.add(testSession);
    if (!added) {
      log.severe("Error adding session : " + testSession);
    }
    return added;
  }

  public boolean remove(TestSession o, SessionTerminationReason reason) {
    updateReason(o, reason);
    return activeTestSessions.remove(o);
  }

  private void updateReason(TestSession o, SessionTerminationReason reason) {
    if (o.getExternalKey() == null) {
      if (SessionTerminationReason.CREATIONFAILED != reason) { // Should not happen. Yeah.
        log.info(
            "Removed a session that had not yet assigned an external key " + o.getInternalKey() +
            ", indicates failure in session creation " + reason);
      }
      return;
    }

    terminatedSessions.add(o.getExternalKey());
    reasons.put(o.getExternalKey(), reason);
    if (reasons.size() > 1000) {
      ExternalSessionKey remove = terminatedSessions.remove();
      reasons.remove(remove);
    }
  }

  public TestSession findSessionByInternalKey(String internalKey) {
    if (internalKey == null) {
      return null;
    }

    for (TestSession session : activeTestSessions) {
      if (internalKey.equals(session.getInternalKey())) {
        return session;
      }
    }
    return null;
  }

  public TestSession getExistingSession(ExternalSessionKey externalkey) {
    TestSession sessionByExternalKey = findSessionByExternalKey(externalkey);
    if (sessionByExternalKey == null) {
      SessionTerminationReason sessionTerminationReason = externalkey != null ? reasons.get(externalkey) : null;
      String keyId = externalkey != null ? externalkey.getKey() : "(null externalkey)";
      if (sessionTerminationReason != null) {
          String msg = "Session [" + keyId + "] was terminated due to " + sessionTerminationReason;
          log.fine(msg);
          throw new GridException(msg);
      }
      String msg = "Session [" + keyId + "] not available and is not among the last 1000 terminated sessions.\n"
          + "Active sessions are" + this.unmodifiableSet();
      log.fine(msg);
      throw new GridException(msg);
    }
    return sessionByExternalKey;
  }

  public TestSession findSessionByExternalKey(ExternalSessionKey externalkey) {
    if (externalkey == null) {
      return null;
    }

    for (TestSession session : activeTestSessions) {
      if (externalkey.equals(session.getExternalKey())) {
        return session;
      }
    }
    return null;
  }

  public Set unmodifiableSet() {
    return Collections.unmodifiableSet(activeTestSessions);
  }

}