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/*
 * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 * 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 software.amazon.jdbc.plugin;

import java.lang.ref.WeakReference;
import java.sql.Connection;
import java.sql.SQLException;
import java.util.Arrays;
import java.util.Map;
import java.util.Objects;
import java.util.Optional;
import java.util.Queue;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.logging.Logger;
import software.amazon.jdbc.HostSpec;
import software.amazon.jdbc.PluginService;
import software.amazon.jdbc.util.Messages;
import software.amazon.jdbc.util.RdsUtils;
import software.amazon.jdbc.util.StringUtils;
import software.amazon.jdbc.util.telemetry.TelemetryContext;
import software.amazon.jdbc.util.telemetry.TelemetryFactory;
import software.amazon.jdbc.util.telemetry.TelemetryTraceLevel;

public class OpenedConnectionTracker {

  static final Map>> openedConnections = new ConcurrentHashMap<>();
  private static final String TELEMETRY_INVALIDATE_CONNECTIONS = "invalidate connections";
  private static final ExecutorService invalidateConnectionsExecutorService =
      Executors.newCachedThreadPool(
          r -> {
            final Thread invalidateThread = new Thread(r);
            invalidateThread.setDaemon(true);
            return invalidateThread;
          });
  private static final ExecutorService abortConnectionExecutorService =
      Executors.newCachedThreadPool(
          r -> {
            final Thread abortThread = new Thread(r);
            abortThread.setDaemon(true);
            return abortThread;
          });

  private static final Logger LOGGER = Logger.getLogger(OpenedConnectionTracker.class.getName());
  private static final RdsUtils rdsUtils = new RdsUtils();
  private final PluginService pluginService;

  public OpenedConnectionTracker(final PluginService pluginService) {
    this.pluginService = pluginService;
  }

  public void populateOpenedConnectionQueue(final HostSpec hostSpec, final Connection conn) {
    final Set aliases = hostSpec.asAliases();

    // Check if the connection was established using an instance endpoint
    if (rdsUtils.isRdsInstance(hostSpec.getHost())) {
      trackConnection(hostSpec.getHostAndPort(), conn);
      return;
    }

    final String instanceEndpoint = aliases.stream()
        .filter(x -> rdsUtils.isRdsInstance(rdsUtils.removePort(x)))
        .max(String::compareToIgnoreCase)
        .orElse(null);

    if (instanceEndpoint == null) {
      LOGGER.finest(
          Messages.get("OpenedConnectionTracker.unableToPopulateOpenedConnectionQueue",
            new Object[] {hostSpec.getHost()}));
      return;
    }

    trackConnection(instanceEndpoint, conn);
  }

  /**
   * Invalidates all opened connections pointing to the same node in a daemon thread. 1
   *
   * @param hostSpec The {@link HostSpec} object containing the url of the node.
   */
  public void invalidateAllConnections(final HostSpec hostSpec) {
    invalidateAllConnections(hostSpec.asAlias());
    invalidateAllConnections(hostSpec.getAliases().toArray(new String[] {}));
  }

  public void invalidateAllConnections(final String... node) {
    TelemetryFactory telemetryFactory = this.pluginService.getTelemetryFactory();
    TelemetryContext telemetryContext = telemetryFactory.openTelemetryContext(
        TELEMETRY_INVALIDATE_CONNECTIONS, TelemetryTraceLevel.NESTED);

    try {
      final Optional instanceEndpoint = Arrays.stream(node)
          .filter(x -> rdsUtils.isRdsInstance(rdsUtils.removePort(x)))
          .findFirst();
      if (!instanceEndpoint.isPresent()) {
        return;
      }
      final Queue> connectionQueue = openedConnections.get(instanceEndpoint.get());
      logConnectionQueue(instanceEndpoint.get(), connectionQueue);
      invalidateConnections(openedConnections.get(instanceEndpoint.get()));

    } finally {
      telemetryContext.closeContext();
    }
  }

  public void invalidateCurrentConnection(final HostSpec hostSpec, final Connection connection) {
    final String host = rdsUtils.isRdsInstance(hostSpec.getHost())
        ? hostSpec.asAlias()
        : hostSpec.getAliases().stream()
            .filter(x -> rdsUtils.isRdsInstance(rdsUtils.removePort(x)))
            .findFirst()
            .orElse(null);

    if (StringUtils.isNullOrEmpty(host)) {
      return;
    }

    final Queue> connectionQueue = openedConnections.get(host);
    logConnectionQueue(host, connectionQueue);
    connectionQueue.removeIf(connectionWeakReference -> Objects.equals(connectionWeakReference.get(), connection));
  }

  private void trackConnection(final String instanceEndpoint, final Connection connection) {
    final Queue> connectionQueue =
        openedConnections.computeIfAbsent(
            instanceEndpoint,
            (k) -> new ConcurrentLinkedQueue<>());
    connectionQueue.add(new WeakReference<>(connection));
    logOpenedConnections();
  }

  private void invalidateConnections(final Queue> connectionQueue) {
    invalidateConnectionsExecutorService.submit(() -> {
      WeakReference connReference;
      while ((connReference = connectionQueue.poll()) != null) {
        final Connection conn = connReference.get();
        if (conn == null) {
          continue;
        }

        try {
          conn.abort(abortConnectionExecutorService);
        } catch (final SQLException e) {
          // swallow this exception, current connection should be useless anyway.
        }
      }
    });
  }

  public void logOpenedConnections() {
    LOGGER.finest(() -> {
      final StringBuilder builder = new StringBuilder();
      openedConnections.forEach((key, queue) -> {
        if (!queue.isEmpty()) {
          builder.append("\t");
          builder.append(key).append(" :");
          builder.append("\n\t{");
          for (final WeakReference connection : queue) {
            builder.append("\n\t\t").append(connection.get());
          }
          builder.append("\n\t}\n");
        }
      });
      return String.format("Opened Connections Tracked: \n[\n%s\n]", builder);
    });
  }

  private void logConnectionQueue(final String host, final Queue> queue) {
    if (queue == null || queue.isEmpty()) {
      return;
    }

    final StringBuilder builder = new StringBuilder();
    builder.append(host).append("\n[");
    for (final WeakReference connection : queue) {
      builder.append("\n\t").append(connection.get());
    }
    builder.append("\n]");
    LOGGER.finest(Messages.get("OpenedConnectionTracker.invalidatingConnections", new Object[] {builder.toString()}));
  }

  public void pruneNullConnections() {
    openedConnections.forEach((key, queue) -> {
      queue.removeIf(connectionWeakReference -> Objects.equals(connectionWeakReference.get(), null));
    });
  }

  public static void clearCache() {
    openedConnections.clear();
  }
}