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/*
 * Copyright 2014 the original author or authors.
 *
 * 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 net.kuujo.copycat.state;

import com.typesafe.config.ConfigValueFactory;
import net.kuujo.copycat.cluster.ClusterConfig;
import net.kuujo.copycat.cluster.internal.coordinator.CoordinatedResourceConfig;
import net.kuujo.copycat.protocol.Consistency;
import net.kuujo.copycat.resource.ResourceConfig;
import net.kuujo.copycat.state.internal.DefaultStateLog;
import net.kuujo.copycat.state.internal.SnapshottableLog;
import net.kuujo.copycat.util.internal.Assert;

import java.util.Map;

/**
 * State log configuration.
 *
 * @author Jordan Halterman
 */
public class StateLogConfig extends ResourceConfig {
  private static final String STATE_LOG_CONSISTENCY = "consistency";

  private static final String DEFAULT_CONFIGURATION = "event-log-defaults";
  private static final String CONFIGURATION = "event-log";

  public StateLogConfig() {
    super(CONFIGURATION, DEFAULT_CONFIGURATION);
  }

  public StateLogConfig(Map config) {
    super(config, CONFIGURATION, DEFAULT_CONFIGURATION);
  }

  public StateLogConfig(String resource) {
    super(resource, CONFIGURATION, DEFAULT_CONFIGURATION);
  }

  protected StateLogConfig(String... resources) {
    super(addResources(resources, CONFIGURATION, DEFAULT_CONFIGURATION));
  }

  protected StateLogConfig(Map config, String... resources) {
    super(config, addResources(resources, CONFIGURATION, DEFAULT_CONFIGURATION));
  }

  protected StateLogConfig(StateLogConfig config) {
    super(config);
  }

  @Override
  public StateLogConfig copy() {
    return new StateLogConfig(this);
  }

  /**
   * Sets the state log read consistency.
   *
   * @param consistency The state log read consistency.
   * @throws java.lang.NullPointerException If the consistency is {@code null}
   */
  public void setDefaultConsistency(String consistency) {
    this.config = config.withValue(STATE_LOG_CONSISTENCY, ConfigValueFactory.fromAnyRef(Consistency.parse(Assert.isNotNull(consistency, "consistency")).toString()));
  }

  /**
   * Sets the state log read consistency.
   *
   * @param consistency The state log read consistency.
   * @throws java.lang.NullPointerException If the consistency is {@code null}
   */
  public void setDefaultConsistency(Consistency consistency) {
    this.config = config.withValue(STATE_LOG_CONSISTENCY, ConfigValueFactory.fromAnyRef(Assert.isNotNull(consistency, "consistency")
      .toString()));
  }

  /**
   * Returns the state log read consistency.
   *
   * @return The state log read consistency.
   */
  public Consistency getDefaultConsistency() {
    return Consistency.parse(config.getString(STATE_LOG_CONSISTENCY));
  }

  /**
   * Sets the state log read consistency, returning the configuration for method chaining.
   *
   * @param consistency The state log read consistency.
   * @return The state log configuration.
   * @throws java.lang.NullPointerException If the consistency is {@code null}
   */
  public StateLogConfig withDefaultConsistency(String consistency) {
    setDefaultConsistency(consistency);
    return this;
  }

  /**
   * Sets the state log read consistency, returning the configuration for method chaining.
   *
   * @param consistency The state log read consistency.
   * @return The state log configuration.
   * @throws java.lang.NullPointerException If the consistency is {@code null}
   */
  public StateLogConfig withDefaultConsistency(Consistency consistency) {
    setDefaultConsistency(consistency);
    return this;
  }

  @Override
  public CoordinatedResourceConfig resolve(ClusterConfig cluster) {
    Assert.config(getReplicas(), getReplicas().isEmpty() || cluster.getMembers().containsAll(getReplicas()), "Resource replica set must contain only active cluster members");
    return new CoordinatedResourceConfig(super.toMap())
      .withElectionTimeout(getElectionTimeout())
      .withHeartbeatInterval(getHeartbeatInterval())
      .withResourceType(DefaultStateLog.class)
      .withLog(new SnapshottableLog(getLog()))
      .withSerializer(getSerializer())
      .withExecutor(getExecutor())
      .withResourceConfig(this)
      .withReplicas(getReplicas().isEmpty() ? cluster.getMembers() : getReplicas());
  }

}