/*
 *    This program is free software; you can redistribute it and/or modify
 *    it under the terms of the GNU General Public License as published by
 *    the Free Software Foundation; either version 2 of the License, or
 *    (at your option) any later version.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License
 *    along with this program; if not, write to the Free Software
 *    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

/*
 *    PlotData2D.java
 *    Copyright (C) 2000 University of Waikato, Hamilton, New Zealand
 *
 */


package weka.gui.visualize;

import weka.core.FastVector;
import weka.core.Instances;
import weka.filters.Filter;
import weka.filters.unsupervised.attribute.Add;

import java.awt.Color;

/**
 * This class is a container for plottable data. Instances form the
 * primary data. An optional array of classifier/clusterer predictions
 * (associated 1 for 1 with the instances) can also be provided.
 *
 * @author Mark Hall (mhall@cs.waikato.ac.nz)
 * @version $Revision: 5741 $
 */
public class PlotData2D {

  /** The instances */
  protected Instances m_plotInstances = null;

  /** The name of this plot */
  protected String m_plotName = "new plot";
  
  /**
   * The name of this plot (possibly in html) suitable for using in a 
   * tool tip text.
   */
  protected String m_plotNameHTML = null;

  /** Custom colour for this plot */
  public boolean m_useCustomColour = false;
  public Color m_customColour = null;

  /** Display all points (ie. those that map to the same display coords) */
  public boolean m_displayAllPoints = false;
  
  /**
   *  If the shape size of a point equals this size then always plot
   * it (i.e. even if it is obscured by other points)
   */
  public int m_alwaysDisplayPointsOfThisSize = -1;

  /** Panel coordinate cache for data points */
  protected double [][] m_pointLookup;

  /** Additional optional information to control the size of points.
      The default is shape size 2  */
  protected int [] m_shapeSize;

  /** Additional optional information to control the point shape for this
      data. Default is to allow automatic assigning of point shape on the
      basis of plot number */
  protected int [] m_shapeType;

  /**
   * Additional optional information to control the drawing of lines
   * between consecutive points. Setting an entry in the array to true
   * indicates that the associated point should have a line connecting
   * it to the previous point.
   */
  protected boolean [] m_connectPoints;

  /** These are used to determine bounds */

  /** The x index */
  private int m_xIndex;

  /** The y index */
  private int m_yIndex;

  /** The colouring index */
  private int m_cIndex;

  /** Holds the min and max values of the x, y and colouring attributes 
   for this plot */
  protected double m_maxX;
  protected double m_minX;
  protected double m_maxY;
  protected double m_minY;
  protected double m_maxC;
  protected double m_minC;

  /**
   * Construct a new PlotData2D using the supplied instances
   * @param insts the instances to use.
   */
  public PlotData2D(Instances insts) {   
    m_plotInstances = insts;
    m_xIndex = m_yIndex = m_cIndex = 0;
    m_pointLookup = new double [m_plotInstances.numInstances()][4];
    m_shapeSize = new int [m_plotInstances.numInstances()];
    m_shapeType = new int [m_plotInstances.numInstances()];
    m_connectPoints = new boolean [m_plotInstances.numInstances()];
    for (int i = 0; i < m_plotInstances.numInstances(); i++) {
      m_shapeSize[i] = Plot2D.DEFAULT_SHAPE_SIZE; //default shape size
      m_shapeType[i] = Plot2D.CONST_AUTOMATIC_SHAPE; // default (automatic shape assignment)
    }
    determineBounds();
  }

  /**
   * Adds an instance number attribute to the plottable instances,
   */
  public void addInstanceNumberAttribute() {
    String originalRelationName = m_plotInstances.relationName();
    int originalClassIndex = m_plotInstances.classIndex();
    try {
      Add addF = new Add();
      addF.setAttributeName("Instance_number");
      addF.setAttributeIndex("first");
      addF.setInputFormat(m_plotInstances);
      m_plotInstances = Filter.useFilter(m_plotInstances, addF);
      m_plotInstances.setClassIndex(originalClassIndex + 1);
      for (int i = 0; i < m_plotInstances.numInstances(); i++) {
	m_plotInstances.instance(i).setValue(0,(double)i);
      }
      m_plotInstances.setRelationName(originalRelationName);
    } catch (Exception ex) {
      ex.printStackTrace();
    }
  }

  /**
   * Returns the instances for this plot
   * @return the instances for this plot
   */
  public Instances getPlotInstances() {
    return new Instances(m_plotInstances);
  }

  /**
   * Set the name of this plot
   * @param name the name for this plot
   */
  public void setPlotName(String name) {
    m_plotName = name;
  }

  /**
   * Get the name of this plot
   * @return the name of this plot
   */
  public String getPlotName() {
    return m_plotName;
  }
  
  /**
   * Set the plot name for use in a tool tip text.
   * 
   * @param name the name of the plot for potential use in a tool
   * tip text (may use html).
   */
  public void setPlotNameHTML(String name) {
    m_plotNameHTML = name;
  }
  
  /**
   * Get the name of the plot for use in a tool tip text.
   * Defaults to the standard plot name if it hasn't been set.
   * 
   * @return the name of this plot (possibly in html) for use
   * in a tool tip text.
   */
  public String getPlotNameHTML() {
    if (m_plotNameHTML == null) {
      return m_plotName;
    }
    
    return m_plotNameHTML;
  }

  /**
   * Set the shape type for the plot data
   * @param st an array of integers corresponding to shape types (see
   * constants defined in Plot2D)
   */
  public void setShapeType(int [] st) throws Exception {
    m_shapeType = st;
    if (m_shapeType.length != m_plotInstances.numInstances()) {
      throw new Exception("PlotData2D: Shape type array must have the same "
			  +"number of entries as number of data points!");
    }
    for (int i = 0; i < st.length; i++) {
      if (m_shapeType[i] == Plot2D.ERROR_SHAPE) {
	m_shapeSize[i] = 3;
      }
    }
  }

  /**
   * Set the shape type for the plot data
   * @param st a FastVector of integers corresponding to shape types (see
   * constants defined in Plot2D)
   */
  public void setShapeType(FastVector st) throws Exception {
    if (st.size() != m_plotInstances.numInstances()) {
      throw new Exception("PlotData2D: Shape type vector must have the same "
			  +"number of entries as number of data points!");
    }
    m_shapeType = new int [st.size()];
    for (int i = 0; i < st.size(); i++) {
      m_shapeType[i] = ((Integer)st.elementAt(i)).intValue();
      if (m_shapeType[i] == Plot2D.ERROR_SHAPE) {
	m_shapeSize[i] = 3;
      }
    }
  }

  /**
   * Set the shape sizes for the plot data
   * @param ss an array of integers specifying the size of data points
   */
  public void setShapeSize(int [] ss) throws Exception {
    m_shapeSize = ss;
    if (m_shapeType.length != m_plotInstances.numInstances()) {
      throw new Exception("PlotData2D: Shape size array must have the same "
			  +"number of entries as number of data points!");
    }
  }
  
  /**
   * Set the shape sizes for the plot data
   * @param ss a FastVector of integers specifying the size of data points
   */
  public void setShapeSize(FastVector ss) throws Exception {
    if (ss.size() != m_plotInstances.numInstances()) {
      throw new Exception("PlotData2D: Shape size vector must have the same "
			  +"number of entries as number of data points!");
    }
    //System.err.println("Setting connect points ");
    m_shapeSize = new int [ss.size()];
    for (int i = 0; i < ss.size(); i++) {
      m_shapeSize[i] = ((Integer)ss.elementAt(i)).intValue();
    }
  }

  /**
   * Set whether consecutive points should be connected by lines
   * @param cp an array of boolean specifying which points should be
   * connected to their preceeding neighbour.
   */
  public void setConnectPoints(boolean [] cp) throws Exception {
    m_connectPoints = cp;
    if (m_connectPoints.length != m_plotInstances.numInstances()) {
      throw new Exception("PlotData2D: connect points array must have the "
			  +"same number of entries as number of data points!");
    }
    m_connectPoints[0] = false;
  }
  
  /**
   * Set whether consecutive points should be connected by lines
   * @param cp a FastVector of boolean specifying which points should be
   * connected to their preceeding neighbour.
   */
  public void setConnectPoints(FastVector cp) throws Exception {
    if (cp.size() != m_plotInstances.numInstances()) {
      throw new Exception("PlotData2D: connect points array must have the "
			  +"same number of entries as number of data points!");
    }
    //System.err.println("Setting connect points ");
    m_shapeSize = new int [cp.size()];
    for (int i = 0; i < cp.size(); i++) {
      m_connectPoints[i] = ((Boolean)cp.elementAt(i)).booleanValue();
    }
    m_connectPoints[0] = false;
  }

  /**
   * Set a custom colour to use for this plot. This overides any
   * data index to use for colouring. If null, then will revert back
   * to the default (no custom colouring).
   * @param c a custom colour to use for this plot or null (default---no
   * colouring).
   */
  public void setCustomColour(Color c) {
    m_customColour = c;
    if (c != null) {
      m_useCustomColour = true;
    } else {
      m_useCustomColour = false;
    }
  }

  /**
   * Set the x index of the data.
   * @param x the x index
   */
  public void setXindex(int x) {
    m_xIndex = x;
    determineBounds();
  }

  /**
   * Set the y index of the data
   * @param y the y index
   */
  public void setYindex(int y) {
    m_yIndex = y;
    determineBounds();
  }

  /**
   * Set the colouring index of the data
   * @param c the colouring index
   */
  public void setCindex(int c) {
    m_cIndex = c;
    determineBounds();
  }

  /**
   * Get the currently set x index of the data
   * @return the current x index
   */
  public int getXindex() {
    return m_xIndex;
  }

  /**
   * Get the currently set y index of the data
   * @return the current y index
   */
  public int getYindex() {
    return m_yIndex;
  }

  /**
   * Get the currently set colouring index of the data
   * @return the current colouring index
   */
  public int getCindex() {
    return m_cIndex;
  }

  /**
   * Determine bounds for the current x,y and colouring indexes
   */
  private void determineBounds() {
     double value,min,max;
    
    if (m_plotInstances != null && 
	m_plotInstances.numAttributes() > 0 &&
	m_plotInstances.numInstances() > 0) {
      // x bounds
      min=Double.POSITIVE_INFINITY;
      max=Double.NEGATIVE_INFINITY;
      if (m_plotInstances.attribute(m_xIndex).isNominal()) {
	m_minX = 0;
	m_maxX = m_plotInstances.attribute(m_xIndex).numValues()-1;
      } else {
	for (int i=0;i<m_plotInstances.numInstances();i++) {
	  if (!m_plotInstances.instance(i).isMissing(m_xIndex)) {
	    value = m_plotInstances.instance(i).value(m_xIndex);
	    if (value < min) {
	      min = value;
	    }
	    if (value > max) {
	      max = value;
	    }
	  }
	}
	
	// handle case where all values are missing
	if (min == Double.POSITIVE_INFINITY) min = max = 0.0;
	
	m_minX = min; m_maxX = max;
	if (min == max) {
	  m_maxX += 0.05;
	  m_minX -= 0.05;
	}
      }

      // y bounds
      min=Double.POSITIVE_INFINITY;
      max=Double.NEGATIVE_INFINITY;
      if (m_plotInstances.attribute(m_yIndex).isNominal()) {
	m_minY = 0;
	m_maxY = m_plotInstances.attribute(m_yIndex).numValues()-1;
      } else {
	for (int i=0;i<m_plotInstances.numInstances();i++) {
	  if (!m_plotInstances.instance(i).isMissing(m_yIndex)) {
	    value = m_plotInstances.instance(i).value(m_yIndex);
	    if (value < min) {
	      min = value;
	    }
	    if (value > max) {
	      max = value;
	    }
	  }
	}
	
	// handle case where all values are missing
	if (min == Double.POSITIVE_INFINITY) min = max = 0.0;

	m_minY = min; m_maxY = max;
	if (min == max) {
	  m_maxY += 0.05;
	  m_minY -= 0.05;
	}
      }
      
      // colour bounds
      min=Double.POSITIVE_INFINITY;
      max=Double.NEGATIVE_INFINITY;

      for (int i=0;i<m_plotInstances.numInstances();i++) {
	if (!m_plotInstances.instance(i).isMissing(m_cIndex)) {
	  value = m_plotInstances.instance(i).value(m_cIndex);
	  if (value < min) {
	    min = value;
	  }
	  if (value > max) {
	    max = value;
	  }
	}
      }

      // handle case where all values are missing
      if (min == Double.POSITIVE_INFINITY) min = max = 0.0;

      m_minC = min; m_maxC = max;
    }
  }
}