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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.CapabilityNotPresentOnTheGridException;
import org.openqa.grid.common.exception.GridException;
import org.openqa.selenium.remote.DesiredCapabilities;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.Set;
import java.util.concurrent.CopyOnWriteArraySet;
import java.util.logging.Logger;
import java.util.stream.Collectors;

/**
 * A set of RemoteProxies.
 *
 * Obeys the iteration guarantees of CopyOnWriteArraySet
 */
@ThreadSafe
public class ProxySet implements Iterable {

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

  private static final Logger log = Logger.getLogger(ProxySet.class.getName());
  private volatile boolean throwOnCapabilityNotPresent = true;

  public ProxySet(boolean throwOnCapabilityNotPresent) {
    this.throwOnCapabilityNotPresent = throwOnCapabilityNotPresent;
  }

  /**
   * killing the timeout detection threads.
   */
  public void teardown() {
    proxies.forEach(RemoteProxy::teardown);
  }

  public boolean hasCapability(Map requestedCapability) {
    return proxies.stream().anyMatch(remoteProxy -> remoteProxy.hasCapability(requestedCapability));
  }

  /**
   * Removes the specified instance from the proxySet
   * @param proxy The proxy to remove, must be present in this set
   * @return The instance that was removed. Not null.
   */
  public RemoteProxy remove(RemoteProxy proxy) {
    // Find the original proxy. While the supplied one is logically equivalent, it may be a fresh object with
    // an empty TestSlot list, which doesn't figure into the proxy equivalence check.  Since we want to free up
    // those test sessions, we need to operate on that original object.
    for (RemoteProxy p : proxies) {
      if (p.equals(proxy)) {
        proxies.remove(p);
        return p;
      }
    }
    throw new IllegalStateException("Did not contain proxy" + proxy);
  }

  public void add(RemoteProxy proxy) {
    proxies.add(proxy);
  }

  public boolean contains(RemoteProxy o) {
    return proxies.contains(o);
  }

  public List getBusyProxies() {
    return proxies.stream().filter(RemoteProxy::isBusy).collect(Collectors.toList());
  }

  public RemoteProxy getProxyById(String id) {
    return proxies.stream().filter((proxy) -> proxy.getId().equals(id)).findFirst().orElse(null);
  }

  public boolean isEmpty() {
    return proxies.isEmpty();
  }

  public List getSorted() {
    List sorted = new ArrayList<>(proxies);
    Collections.sort(sorted, proxyComparator);
    return sorted;
  }

  private Comparator proxyComparator = (o1, o2) -> {
    double p1used = o1.getResourceUsageInPercent();
    double p2used = o2.getResourceUsageInPercent();

    if (p1used == p2used) {
      long time1lastUsed = o1.getLastSessionStart();
      long time2lastUsed = o2.getLastSessionStart();
      if (time1lastUsed == time2lastUsed) return 0;
      return time1lastUsed < time2lastUsed? -1 : 1;
    }
    return p1used < p2used? -1 : 1;
  };

  public TestSession getNewSession(Map desiredCapabilities) {
    // sort the proxies first, by default by total number of
    // test running, to avoid putting all the load of the first
    // proxies.
    List sorted = getSorted();
    log.fine("Available nodes: " + sorted);
    return sorted.stream()
        .map(proxy -> proxy.getNewSession(desiredCapabilities))
        .filter(Objects::nonNull)
        .findFirst().orElse(null);
  }

  public Iterator iterator() {
    return proxies.iterator();
  }

  public int size() {
    return proxies.size();
  }

  public void verifyAbilityToHandleDesiredCapabilities(Map desiredCapabilities) {
    if (proxies.isEmpty()) {
      if (throwOnCapabilityNotPresent) {
        throw new GridException("Empty pool of VM for setup "
                                + new DesiredCapabilities(desiredCapabilities));
      }
      log.warning("Empty pool of nodes.");
    }
    if (!hasCapability(desiredCapabilities)) {
      if (throwOnCapabilityNotPresent) {
        throw new CapabilityNotPresentOnTheGridException(desiredCapabilities);
      }
      log.warning("grid doesn't contain " + new DesiredCapabilities(desiredCapabilities) +
          " at the moment.");
    }
  }

  public void setThrowOnCapabilityNotPresent(boolean throwOnCapabilityNotPresent) {
    this.throwOnCapabilityNotPresent = throwOnCapabilityNotPresent;
  }
}