/*
 * Jalview - A Sequence Alignment Editor and Viewer (Version 2.7)
 * Copyright (C) 2011 J Procter, AM Waterhouse, G Barton, M Clamp, S Searle
 * 
 * This file is part of Jalview.
 * 
 * Jalview 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 3 of the License, or (at your option) any later version.
 * 
 * Jalview 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 Jalview.  If not, see <http://www.gnu.org/licenses/>.
 */
package jalview.schemes;

import java.awt.*;

import jalview.datamodel.*;

public class AnnotationColourGradient extends ResidueColourScheme
{
  public static final int NO_THRESHOLD = -1;

  public static final int BELOW_THRESHOLD = 0;

  public static final int ABOVE_THRESHOLD = 1;

  public AlignmentAnnotation annotation;

  int aboveAnnotationThreshold = -1;

  public boolean thresholdIsMinMax = false;

  GraphLine annotationThreshold;

  float r1, g1, b1, rr, gg, bb, dr, dg, db;

  ColourSchemeI colourScheme;

  public boolean predefinedColours = false;

  /**
   * Creates a new AnnotationColourGradient object.
   */
  public AnnotationColourGradient(AlignmentAnnotation annotation,
          ColourSchemeI originalColour, int aboveThreshold)
  {
    if (originalColour instanceof AnnotationColourGradient)
    {
      colourScheme = ((AnnotationColourGradient) originalColour).colourScheme;
    }
    else
    {
      colourScheme = originalColour;
    }

    this.annotation = annotation;

    aboveAnnotationThreshold = aboveThreshold;

    if (aboveThreshold != NO_THRESHOLD && annotation.threshold != null)
    {
      annotationThreshold = annotation.threshold;
    }
  }

  /**
   * Creates a new AnnotationColourGradient object.
   */
  public AnnotationColourGradient(AlignmentAnnotation annotation,
          Color minColour, Color maxColour, int aboveThreshold)
  {
    this.annotation = annotation;

    aboveAnnotationThreshold = aboveThreshold;

    if (aboveThreshold != NO_THRESHOLD && annotation.threshold != null)
    {
      annotationThreshold = annotation.threshold;
    }

    r1 = minColour.getRed();
    g1 = minColour.getGreen();
    b1 = minColour.getBlue();

    rr = maxColour.getRed() - r1;
    gg = maxColour.getGreen() - g1;
    bb = maxColour.getBlue() - b1;
  }

  public String getAnnotation()
  {
    return annotation.label;
  }

  public int getAboveThreshold()
  {
    return aboveAnnotationThreshold;
  }

  public float getAnnotationThreshold()
  {
    if (annotationThreshold == null)
    {
      return 0;
    }
    else
    {
      return annotationThreshold.value;
    }
  }

  public ColourSchemeI getBaseColour()
  {
    return colourScheme;
  }

  public Color getMinColour()
  {
    return new Color((int) r1, (int) g1, (int) b1);
  }

  public Color getMaxColour()
  {
    return new Color((int) (r1 + rr), (int) (g1 + gg), (int) (b1 + bb));
  }

  /**
   * DOCUMENT ME!
   * 
   * @param n
   *          DOCUMENT ME!
   * 
   * @return DOCUMENT ME!
   */
  public Color findColour(char c)
  {
    return Color.red;
  }

  /**
   * DOCUMENT ME!
   * 
   * @param n
   *          DOCUMENT ME!
   * @param j
   *          DOCUMENT ME!
   * 
   * @return DOCUMENT ME!
   */
  public Color findColour(char c, int j)
  {
    Color currentColour = Color.white;

    if ((threshold == 0) || aboveThreshold(c, j))
    {
      if (j < annotation.annotations.length
              && annotation.annotations[j] != null
              && !jalview.util.Comparison.isGap(c))
      {

        if (predefinedColours)
        {
          if (annotation.annotations[j].colour != null)
            return annotation.annotations[j].colour;
          else
            return currentColour;
        }

        if (aboveAnnotationThreshold == NO_THRESHOLD
                || (annotationThreshold != null
                        && aboveAnnotationThreshold == ABOVE_THRESHOLD && annotation.annotations[j].value >= annotationThreshold.value)
                || (annotationThreshold != null
                        && aboveAnnotationThreshold == BELOW_THRESHOLD && annotation.annotations[j].value <= annotationThreshold.value))
        {

          float range = 1f;
          if (thresholdIsMinMax
                  && annotation.threshold != null
                  && aboveAnnotationThreshold == ABOVE_THRESHOLD
                  && annotation.annotations[j].value > annotation.threshold.value)
          {
            range = (annotation.annotations[j].value - annotation.threshold.value)
                    / (annotation.graphMax - annotation.threshold.value);
          }
          else if (thresholdIsMinMax && annotation.threshold != null
                  && aboveAnnotationThreshold == BELOW_THRESHOLD
                  && annotation.annotations[j].value > annotation.graphMin)
          {
            range = (annotation.annotations[j].value - annotation.graphMin)
                    / (annotation.threshold.value - annotation.graphMin);
          }
          else
          {
            range = (annotation.annotations[j].value - annotation.graphMin)
                    / (annotation.graphMax - annotation.graphMin);
          }

          if (colourScheme != null)
          {
            currentColour = colourScheme.findColour(c, j);
          }
          else if (range != 0)
          {
            dr = rr * range + r1;
            dg = gg * range + g1;
            db = bb * range + b1;

            currentColour = new Color((int) dr, (int) dg, (int) db);
          }
        }
      }
    }

    if (conservationColouring)
    {
      currentColour = applyConservation(currentColour, j);
    }

    return currentColour;
  }
}