/*
    * Licensed under the GPL License. You may not use this file except in compliance with the License.
    * You may obtain a copy of the License at
    *
    *   https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
    *
    * THIS PACKAGE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
    * WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
    * PURPOSE.
   */
  package psiprobe.controllers;
  
  import java.awt.BasicStroke;
  import java.awt.Color;
  
  import javax.inject.Inject;
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletResponse;
  
  import org.jfree.chart.ChartFactory;
  import org.jfree.chart.ChartUtils;
  import org.jfree.chart.JFreeChart;
  import org.jfree.chart.axis.DateAxis;
  import org.jfree.chart.plot.PlotOrientation;
  import org.jfree.chart.renderer.xy.XYAreaRenderer;
  import org.jfree.chart.ui.RectangleInsets;
  import org.jfree.data.xy.DefaultTableXYDataset;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import org.springframework.stereotype.Controller;
  import org.springframework.web.bind.ServletRequestUtils;
  import org.springframework.web.bind.annotation.RequestMapping;
  import org.springframework.web.servlet.ModelAndView;
  import org.springframework.web.servlet.mvc.AbstractController;
  
  import psiprobe.Utils;
  import psiprobe.beans.stats.providers.SeriesProvider;
  import psiprobe.jfreechart.XYLine3DRenderer;
  import psiprobe.model.stats.StatsCollection;
  
  /**
   * Plots data from "statsCollection" bean. The data is converted to XYSeries using SeriesProvider,
   * name of which would be passed as a request parameter. The servlet can only plot up to 9 series.
   * It is customizable using these request parameters:
   * <ul>
   * <li>s1c, s2c, ... s9c - Series #i main color</li>
   * <li>s1o, s2o, ... s9o - Series #i outline color</li>
   * <li>bc - Chart background color</li>
   * <li>gc - Chart grid lines color</li>
   * <li>xl - X axis label</li>
   * <li>yl - Y axis label</li>
   * <li>xz - image width</li>
   * <li>yx - image height</li>
   * <li>l - show legend (boolean: true|false)</li>
   * <li>p - name of series provider bean</li>
   * </ul>
   */
  @Controller
  public class RenderChartController extends AbstractController {
  
    /** The Constant logger. */
    private static final Logger logger = LoggerFactory.getLogger(RenderChartController.class);
  
    /** The stats collection. */
    @Inject
    private StatsCollection statsCollection;
  
    /**
     * Gets the stats collection.
     *
     * @return the stats collection
     */
    public StatsCollection getStatsCollection() {
      return statsCollection;
    }
  
    /**
     * Sets the stats collection.
     *
     * @param statsCollection the new stats collection
     */
    public void setStatsCollection(StatsCollection statsCollection) {
      this.statsCollection = statsCollection;
    }
  
    @RequestMapping(path = "/chart.png")
    @Override
    public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response)
        throws Exception {
      return super.handleRequest(request, response);
    }
  
    @Override
    protected ModelAndView handleRequestInternal(HttpServletRequest request,
        HttpServletResponse response) throws Exception {
  
      // the max number of series
      final int seriesMaxCount = 9;
  
     // get Series Color from the request
     int[] seriesColor = new int[seriesMaxCount];
     seriesColor[0] = Utils.toIntHex(request.getParameter("s1c"), 0x9bd2fb);
     seriesColor[1] = Utils.toIntHex(request.getParameter("s2c"), 0xFF0606);
     for (int i = 2; i < seriesMaxCount; i++) {
       seriesColor[i] = Utils.toIntHex(request.getParameter("s" + (i + 1) + "c"), -1);
     }
 
     // get Series Outline Color from the request
     int[] seriesOutlineColor = new int[seriesMaxCount];
     seriesOutlineColor[0] = Utils.toIntHex(request.getParameter("s1o"), 0x0665aa);
     seriesOutlineColor[1] = Utils.toIntHex(request.getParameter("s2o"), 0x9d0000);
     for (int i = 2; i < seriesMaxCount; i++) {
       seriesOutlineColor[i] = Utils.toIntHex(request.getParameter("s" + (i + 1) + "o"), -1);
     }
 
     // background color
     int backgroundColor = Utils.toIntHex(request.getParameter("bc"), 0xFFFFFF);
 
     // grid color
     int gridColor = Utils.toIntHex(request.getParameter("gc"), 0);
 
     // X axis title
     String labelX = ServletRequestUtils.getStringParameter(request, "xl", "");
 
     // Y axis title
     String labelY = ServletRequestUtils.getStringParameter(request, "yl", "");
 
     // image width
     int width = ServletRequestUtils.getIntParameter(request, "xz", 800);
 
     // image height
     int height = ServletRequestUtils.getIntParameter(request, "yz", 400);
 
     // show legend?
     boolean showLegend = ServletRequestUtils.getBooleanParameter(request, "l", true);
 
     // Series provider
     String provider = ServletRequestUtils.getStringParameter(request, "p");
 
     // Chart type
     String chartType = ServletRequestUtils.getStringParameter(request, "ct", "area");
 
     DefaultTableXYDataset ds = new DefaultTableXYDataset();
 
     if (provider != null) {
       Object series = getApplicationContext().getBean(provider);
       if (series instanceof SeriesProvider) {
         ((SeriesProvider) series).populate(ds, statsCollection, request);
       } else {
         logger.error("SeriesProvider '{}' does not implement '{}'", provider, SeriesProvider.class);
       }
     }
 
     // Build series data from the give statistic
     JFreeChart chart = null;
     if ("area".equals(chartType)) {
       chart = ChartFactory.createXYAreaChart("", labelX, labelY, ds, PlotOrientation.VERTICAL,
           showLegend, false, false);
 
       ((XYAreaRenderer) chart.getXYPlot().getRenderer()).setOutline(true);
 
     } else if ("stacked".equals(chartType)) {
       chart = ChartFactory.createStackedXYAreaChart("", labelX, labelY, ds,
           PlotOrientation.VERTICAL, showLegend, false, false);
 
     } else if ("line".equals(chartType)) {
       chart = ChartFactory.createXYLineChart("", labelX, labelY, ds, PlotOrientation.VERTICAL,
           showLegend, false, false);
 
       final XYLine3DRenderer renderer = new XYLine3DRenderer();
       renderer.setDrawOutlines(true);
       for (int i = 0; i < seriesMaxCount; i++) {
         renderer.setSeriesLinesVisible(i, true);
         renderer.setSeriesShapesVisible(i, true);
         renderer.setSeriesStroke(i, new BasicStroke(2));
       }
       renderer.setXOffset(1);
       renderer.setYOffset(1);
       chart.getXYPlot().setRenderer(renderer);
     }
 
     if (chart != null) {
       chart.setAntiAlias(true);
       chart.setBackgroundPaint(new Color(backgroundColor));
       for (int i = 0; i < seriesMaxCount; i++) {
         if (seriesColor[i] >= 0) {
           chart.getXYPlot().getRenderer().setSeriesPaint(i, new Color(seriesColor[i]));
         }
         if (seriesOutlineColor[i] >= 0) {
           chart.getXYPlot().getRenderer().setSeriesOutlinePaint(i,
               new Color(seriesOutlineColor[i]));
         }
       }
       chart.getXYPlot().setDomainGridlinePaint(new Color(gridColor));
       chart.getXYPlot().setRangeGridlinePaint(new Color(gridColor));
       chart.getXYPlot().setDomainAxis(0, new DateAxis());
       chart.getXYPlot().setDomainAxis(1, new DateAxis());
       chart.getXYPlot().setInsets(new RectangleInsets(-15, 0, 0, 10));
 
       response.setHeader("Content-type", "image/png");
       response.getOutputStream()
           .write(ChartUtils.encodeAsPNG(chart.createBufferedImage(width, height)));
     }
 
     return null;
   }
 }