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/*
 * Copyright (c) 2010-2015 Pivotal Software, Inc. 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. See accompanying
 * LICENSE file.
 */
package com.gemstone.gemfire.internal.admin.statalerts;

import java.io.DataOutput;
import java.io.DataInput;
import java.io.IOException;

import com.gemstone.gemfire.DataSerializer;
import com.gemstone.gemfire.StatisticDescriptor;
import com.gemstone.gemfire.Statistics;
import com.gemstone.gemfire.StatisticsFactory;
import com.gemstone.gemfire.internal.admin.StatAlert;
import com.gemstone.gemfire.internal.admin.StatAlertDefinition;

/**
 * Implementation of {@link StatAlertDefinition} This provides the definition
 * for single statistic
 * 
 * @author hgadre
 */
public final class SingleAttrDefinitionImpl implements StatAlertDefinition {
  private static final long serialVersionUID = 3292417185742697896L;

  protected String name;

  protected int _id;

  protected StatisticInfo statisticInfo;

  public SingleAttrDefinitionImpl() {
  }

  /**
   * @param statisticInfo
   */
  public SingleAttrDefinitionImpl(String name, StatisticInfo statisticInfo) {
    super();
    this.statisticInfo = statisticInfo;
    this.name = name;
    this._id = getName().toUpperCase().hashCode();
  }

  public int getId() {
    return _id;
  }

  @Override // GemStoneAddition
  public int hashCode() {
    return getId();
  }

  public boolean verify(StatisticsFactory factory) {
    boolean result = false;

    if (name == null || name.length() == 0)
      return false;

    if (statisticInfo != null) {
      Statistics[] temp = factory.findStatisticsByTextId(statisticInfo
          .getStatisticsTextId());

      if (temp == null || temp.length == 0)
        return false;

      StatisticDescriptor[] temp1 = temp[0].getType().getStatistics();
      for (int i = 0; i < temp1.length; i++) {
        if (statisticInfo.getStatisticName().equals(temp1[i].getName())) {
          result = true;
          break;
        }
      }
    }
    return result;
  }

  public String getStringRepresentation() {

    StringBuffer buffer = new StringBuffer();
    buffer.append("StatAlertDefinition [\n");
    buffer.append(toString());
    buffer.append("]");

    return buffer.toString();
  }

  @Override // GemStoneAddition
  public String toString() {

    StringBuffer buffer = new StringBuffer();
    buffer.append("Name:" + getName() + "\n");
    buffer.append("Attribute:\n");
    if (statisticInfo != null) {
      buffer.append(statisticInfo.toString() + "\n");
    }

    return buffer.toString();
  }

  /**
   * This method returns the name of this stat alert definition.
   * 
   * @return Name of the StatAlertDefinition
   */
  public String getName() {
    return name;
  }

  /**
   * This method sets the name of this stat alert definition.
   * 
   * @param name
   *                name to be set for this StatAlertDefinition.
   */
  public void setName(String name) {
    this.name = name;
  }

  /*
   * (non-Javadoc)
   * 
   * @see com.gemstone.gemfire.internal.admin.StatAlertDefinition#getStatisticInfo()
   */
  public StatisticInfo[] getStatisticInfo() {
    return new StatisticInfo[] { statisticInfo };
  }

  /*
   * (non-Javadoc)
   * 
   * @see com.gemstone.gemfire.internal.admin.StatAlertDefinition#setStatisticInfo(com.gemstone.gemfire.internal.admin.StatisticInfo[])
   */
  public void setStatisticInfo(StatisticInfo[] info) {
    if (info == null || info.length != 1)
      throw new IllegalArgumentException(
          "setStatisticInfo method requires 1 length array of StatisticInfo objects.");

    statisticInfo = info[0];
  }

  public Number[] getValue() {
    Number[] vals = new Number[1];
    vals[0] = statisticInfo.getStatistics().get(
        statisticInfo.getStatisticDescriptor());
    return vals;
  }

  public Number[] getValue(Number[] vals) {
    return vals;
  }

  /*
   * (non-Javadoc)
   * 
   * @see com.gemstone.gemfire.internal.admin.StatAlertDefinition#evaluate(java.lang.Number[])
   */
  public boolean evaluate(Number[] params) {
    return evaluate() && params != null && params.length == 1;
  }

  public boolean evaluate() {
    return statisticInfo != null;
  }

  public StatAlert evaluateAndAlert(Number[] params) {
    return evaluate(params) ? getAlert(params[0]) : null;
  }

  public StatAlert evaluateAndAlert() {
    return evaluate() ? getAlert(getValue()[0]) : null;
  }

  protected StatAlert getAlert(Number val) {
    Number[] vals = new Number[1];
    vals[0] = val;
    return new StatAlert(this.getId(), vals);
  }

  public boolean hasDecorator(String decoratorID) {
    return false;
  }

  public StatAlertDefinition getDecorator(String decoratorID) {
    return null;
  }

  public void toData(DataOutput out) throws IOException {
    DataSerializer.writeString(this.name, out);
    DataSerializer.writePrimitiveInt(this._id, out);
    DataSerializer.writeObject(this.statisticInfo, out);
  }

  public void fromData(DataInput in)
    throws IOException, ClassNotFoundException {
    this.name = DataSerializer.readString(in);
    this._id = DataSerializer.readPrimitiveInt(in);
    this.statisticInfo = (StatisticInfo)DataSerializer.readObject(in);
  }
}