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/*
 * JPPF.
 * Copyright (C) 2005-2015 JPPF Team.
 * http://www.jppf.org
 *
 * 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.jppf.ui.monitoring.charts;

import static org.jppf.utils.ReflectionHelper.*;

import java.awt.*;
import java.lang.reflect.Proxy;
import java.util.*;
import java.util.List;

import org.jppf.ui.monitoring.charts.PlotXYChartHandler.LegendLabelGeneratorInvocationHandler;
import org.jppf.ui.monitoring.charts.config.ChartConfiguration;
import org.jppf.ui.monitoring.data.*;

/**
 * Instances of this class are used to create and update line charts with an horizontal orientation.
 * @author Laurent Cohen
 */
public class DifferenceChartHandler implements ChartHandler
{
  /**
   * The stats formatter that provides the data.
   */
  private StatsHandler statsHandler = null;

  /**
   * Initialize this chart handler with a specified stats formatter.
   * @param statsHandler the stats formatter that provides the data.
   */
  public DifferenceChartHandler(final StatsHandler statsHandler)
  {
    this.statsHandler = statsHandler;
  }

  /**
   * Create a plot XY chart based on a chart configuration.
   * @param config holds the configuration parameters for the chart created, modified by this method.
   * @return a ChartConfiguration instance.
   * @see org.jppf.ui.monitoring.charts.ChartHandler#createChart(org.jppf.ui.monitoring.charts.config.ChartConfiguration)
   */
  @Override
  public ChartConfiguration createChart(final ChartConfiguration config)
  {
    Object ds = createDataset(config);
    String s = config.name;
    if (config.unit != null) s += " (" + config.unit+ ')';
    //JFreeChart chart = ChartFactory.createXYLineChart(s, null, null, ds, PlotOrientation.VERTICAL, true, true, false);
    Object chart = invokeMethod(getClass0("org.jfree.chart.ChartFactory"), null, "createXYLineChart",
        s, null, null, ds, getField(getClass0("org.jfree.chart.plot.PlotOrientation"), null, "VERTICAL"), true, true, false);
    //XYPlot plot = chart.getXYPlot();
    Object plot = invokeMethod(getClass0("org.jfree.chart.JFreeChart"), chart, "getXYPlot");
    //XYDifferenceRenderer rend = new XYDifferenceRenderer(Color.green, Color.red, false);
    Object rend = invokeConstructor(getClass0("org.jfree.chart.renderer.xy.XYDifferenceRenderer"),
        new Class[] {Paint.class, Paint.class, Boolean.TYPE}, Color.green, Color.red, false);
    //plot.setRenderer(rend);
    invokeMethod(plot.getClass(), plot, "setRenderer", new Class[] {getClass0("org.jfree.chart.renderer.xy.XYItemRenderer")}, rend);
    //rend.setBaseSeriesVisibleInLegend(true);
    invokeMethod(rend.getClass(), rend, "setBaseSeriesVisibleInLegend", new Class[] {Boolean.TYPE}, true);
    //rend.setLegendItemLabelGenerator(new LegendLabelGenerator());
    Object labelGenerator = Proxy.newProxyInstance(
        getCurrentClassLoader(), getClasses("org.jfree.chart.labels.XYSeriesLabelGenerator"), new LegendLabelGeneratorInvocationHandler());
    invokeMethod(rend.getClass(), rend, "setLegendItemLabelGenerator", labelGenerator);
    //rend.setBaseStroke(new BasicStroke(2f));
    invokeMethod(rend.getClass(), rend, "setBaseStroke", new Class[] {Stroke.class}, new BasicStroke(2.0f));
    config.chart = chart;
    return config;
  }

  /**
   * Create and populate a dataset with the values of the specified fields.
   * @param config the names of the fields whose values populate the dataset.
   * @return a DefaultCategoryDataset instance.
   */
  private Object createDataset(final ChartConfiguration config)
  {
    //XYSeriesCollection ds = new XYSeriesCollection();
    Object ds = newInstance("org.jfree.data.xy.XYSeriesCollection");
    if ((config.fields != null) && (config.fields.length >= 2))
    {
      for (int i=0; i<2; i++)
      {
        Fields key = config.fields[i];
        //XYSeries series = new XYSeries(key);
        Object series = invokeConstructor(getClass0("org.jfree.data.xy.XYSeries"), new Class[] {Comparable.class}, key);
        //ds.addSeries(series);
        invokeMethod(ds.getClass(), ds, "addSeries", series);
        //series.setMaximumItemCount(statsHandler.getRolloverPosition());
        invokeMethod(series.getClass(), series, "setMaximumItemCount", statsHandler.getRolloverPosition());
      }
    }
    config.dataset = ds;
    populateDataset(config);
    return ds;
  }

  /**
   * Populate a dataset based on a chart configuration.
   * @param config the chart configuration containing the dataset to populate.
   * @return a ChartConfiguration instance.
   * @see org.jppf.ui.monitoring.charts.ChartHandler#populateDataset(org.jppf.ui.monitoring.charts.config.ChartConfiguration)
   */
  @Override
  public ChartConfiguration populateDataset(final ChartConfiguration config)
  {
    if (config.fields == null) return config;
    int len = config.fields.length;
    if (len < 2) return config;
    Object ds = config.dataset;
    if (ds == null) return config;
    //List list = ds.getSeries();
    List list = (List) invokeMethod(ds.getClass(), ds, "getSeries");
    for (Object o: list)
    {
      //((XYSeries) o).clear();
      invokeMethod(o.getClass(), o, "clear");
    }
    for (int i=0; i<2; i++)
    {
      Fields key = config.fields[i];
      //XYSeries series = ds.getSeries(i);
      Object series = invokeMethod(ds.getClass(), ds, "getSeries", new Class[] {Integer.TYPE}, i);
      int start = Math.max(0, statsHandler.getTickCount() - statsHandler.getStatsCount());
      for (int j=0; j valueMap = statsHandler.getDoubleValues(j);
        //series.add(start + j, valueMap.get(key));
        invokeMethod(series.getClass(), series, "add", new Class[] { Double.TYPE, Number.class}, start + j, valueMap.get(key));
      }
    }
    return config;
  }

  /**
   * Update a dataset based on a chart configuration.
   * @param config the chart configuration containing the dataset to update.
   * @return a ChartConfiguration instance.
   * @see org.jppf.ui.monitoring.charts.ChartHandler#updateDataset(org.jppf.ui.monitoring.charts.config.ChartConfiguration)
   */
  @Override
  public ChartConfiguration updateDataset(final ChartConfiguration config)
  {
    Object ds = config.dataset;
    if (ds == null) return config;
    Map valueMap = statsHandler.getLatestDoubleValues();
    if (valueMap != null)
    {
      //for (int i=0; i