/*
 * Copyright Terracotta, Inc.
 *
 * 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 org.ehcache.clustered.common.internal;

import org.ehcache.clustered.common.Consistency;
import org.ehcache.clustered.common.PoolAllocation;

import java.io.Serializable;

Configuration properties for a ServerStore instance. /**
 * Configuration properties for a {@code ServerStore} instance.
 */
public class ServerStoreConfiguration implements Serializable {
  private static final long serialVersionUID = 5452646838836730816L;

  
The server-side resource allocation parameters.
/**
   * The server-side resource allocation parameters.
   */
  private final PoolAllocation poolAllocation;

  private final String storedKeyType;
  private final String storedValueType;
  private final String keySerializerType;
  private final String valueSerializerType;
  private final Consistency consistency;
  private final boolean loaderWriterConfigured;
  private final boolean writeBehindConfigured;

  public ServerStoreConfiguration(PoolAllocation poolAllocation,
                                  String storedKeyType,
                                  String storedValueType,
                                  String keySerializerType,
                                  String valueSerializerType,
                                  Consistency consistency,
                                  boolean loaderWriterConfigured) {
    this(poolAllocation, storedKeyType, storedValueType, keySerializerType, valueSerializerType, consistency,
         loaderWriterConfigured, false);
  }


  public ServerStoreConfiguration(PoolAllocation poolAllocation,
                                  String storedKeyType,
                                  String storedValueType,
                                  String keySerializerType,
                                  String valueSerializerType,
                                  Consistency consistency,
                                  boolean loaderWriterConfigured,
                                  boolean writeBehindConfigured) {
    this.poolAllocation = poolAllocation;
    this.storedKeyType = storedKeyType;
    this.storedValueType = storedValueType;
    this.keySerializerType = keySerializerType;
    this.valueSerializerType = valueSerializerType;
    this.consistency = consistency;
    this.loaderWriterConfigured = loaderWriterConfigured;
    this.writeBehindConfigured = writeBehindConfigured;
  }

  public PoolAllocation getPoolAllocation() {
    return poolAllocation;
  }

  public String getStoredKeyType() {
    return storedKeyType;
  }

  public String getStoredValueType() {
    return storedValueType;
  }

  public String getKeySerializerType() {
    return keySerializerType;
  }

  public String getValueSerializerType() {
    return valueSerializerType;
  }

  public Consistency getConsistency() {
    return consistency;
  }

  public boolean isLoaderWriterConfigured() {
    return loaderWriterConfigured;
  }

  public boolean isWriteBehindConfigured() {
    return writeBehindConfigured;
  }

  public boolean isCompatible(ServerStoreConfiguration otherConfiguration, StringBuilder sb) {
    boolean isCompatible = true;

    isCompatible = isCompatible && compareField(sb, "storedKeyType", storedKeyType, otherConfiguration.getStoredKeyType());
    isCompatible = isCompatible && compareField(sb, "storedValueType", storedValueType, otherConfiguration.getStoredValueType());
    isCompatible = isCompatible && compareField(sb, "keySerializerType", keySerializerType, otherConfiguration.getKeySerializerType());
    isCompatible = isCompatible && compareField(sb, "valueSerializerType", valueSerializerType, otherConfiguration.getValueSerializerType());
    isCompatible = isCompatible && compareConsistencyField(sb, consistency, otherConfiguration.getConsistency());
    isCompatible = isCompatible && comparePoolAllocation(sb, otherConfiguration.getPoolAllocation());
    isCompatible = isCompatible && (otherConfiguration.isLoaderWriterConfigured() == loaderWriterConfigured);
    isCompatible = isCompatible && (otherConfiguration.isWriteBehindConfigured() == writeBehindConfigured);

    return isCompatible;
  }

  private boolean comparePoolAllocation(StringBuilder sb, PoolAllocation clientPoolAllocation) {
    if (poolAllocation.isCompatible(clientPoolAllocation)) {
      return true;
    }

    appendFault(sb, "resourcePoolType", poolAllocation, clientPoolAllocation);
    return false;
  }

  private String getClassName(Object obj) {
    if(obj != null) {
      return obj.getClass().getName();
    } else {
      return null;
    }
  }

  private boolean compareConsistencyField(StringBuilder sb, Consistency serverConsistencyValue, Consistency clientConsistencyValue) {
    if((serverConsistencyValue == null && clientConsistencyValue == null)
        || (serverConsistencyValue != null && serverConsistencyValue.equals(clientConsistencyValue))) {
      return true;
    }

    appendFault(sb, "consistencyType", serverConsistencyValue, clientConsistencyValue);
    return false;
  }

  private boolean compareField(StringBuilder sb, String fieldName, String serverConfigValue, String clientConfigValue) {
    if ((serverConfigValue == null && clientConfigValue == null)
        || (serverConfigValue != null && serverConfigValue.equals(clientConfigValue))) {
      return true;
    }

    appendFault(sb, fieldName, serverConfigValue, clientConfigValue);
    return false;
  }

  private void appendFault(StringBuilder sb, String fieldName, Object serverConfigValue, Object clientConfigValue) {
    sb.append("\n\t").append(fieldName)
        .append(" existing: ").append(serverConfigValue)
        .append(", desired: ").append(clientConfigValue);
  }

}