/*
 * Jalview - A Sequence Alignment Editor and Viewer ($$Version-Rel$$)
 * Copyright (C) $$Year-Rel$$ The Jalview Authors
 * 
 * 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/>.
 * The Jalview Authors are detailed in the 'AUTHORS' file.
 */
package jalview.gui;

import jalview.api.AlignViewportI;
import jalview.bin.Cache;
import jalview.datamodel.AlignmentI;
import jalview.renderer.OverviewRenderer;
import jalview.renderer.OverviewResColourFinder;
import jalview.viewmodel.OverviewDimensions;

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.image.BufferedImage;

import javax.swing.JPanel;

@SuppressWarnings("serial")
public class OverviewCanvas extends JPanel
{
  private static final Color TRANS_GREY = new Color(100, 100, 100, 25);

  // This is set true if the alignment view changes whilst
  // the overview is being calculated
  private volatile boolean restart = false;

  private volatile boolean updaterunning = false;

  private boolean disposed = false;

  private BufferedImage lastMiniMe = null;

  // Can set different properties in this seqCanvas than
  // main visible SeqCanvas
  private SequenceRenderer sr;

  private jalview.renderer.seqfeatures.FeatureRenderer fr;

  private OverviewDimensions od;

  private OverviewRenderer or = null;

  private AlignViewportI av;

  private OverviewResColourFinder cf;

  private ProgressPanel progressPanel;

  private boolean showSequenceFeatures;

  private boolean showAnnotation;

  private jalview.api.FeatureRenderer featureRenderer;

  private OverviewPanel panel;

  public OverviewCanvas(OverviewPanel panel,
          OverviewDimensions overviewDims,
          AlignViewportI alignvp, ProgressPanel pp)
  {
    this.panel = panel;
    od = overviewDims;
    av = alignvp;
    progressPanel = pp;

    sr = new SequenceRenderer(av);
    sr.renderGaps = false;
    fr = new jalview.renderer.seqfeatures.FeatureRenderer(av);

    boolean useLegacy = Cache.getDefault(Preferences.USE_LEGACY_GAP, false);
    Color gapCol = Cache.getDefaultColour(Preferences.GAP_COLOUR,
            jalview.renderer.OverviewResColourFinder.OVERVIEW_DEFAULT_GAP);
    Color hiddenCol = Cache.getDefaultColour(Preferences.HIDDEN_COLOUR,
            jalview.renderer.OverviewResColourFinder.OVERVIEW_DEFAULT_HIDDEN);
    cf = new OverviewResColourFinder(useLegacy, gapCol, hiddenCol);

    setSize(od.getWidth(), od.getHeight());
    setPreferredSize(getSize()); // BH 2019.07.29 added
  }

  /**
   * Update the overview dimensions object used by the canvas (e.g. if we change
   * from showing hidden columns to hiding them or vice versa)
   * 
   * @param overviewDims
   */
  public void resetOviewDims(OverviewDimensions overviewDims)
  {
    od = overviewDims;
  }

  /**
   * Signals to drawing code that the associated alignment viewport has changed
   * and a redraw will be required
   */
  public boolean restartDraw()
  {
    synchronized (this)
    {
      if (updaterunning)
      {
        setRestart("restartDraw");
      }
      else
      {
        updaterunning = true;
      }
      return restart;
    }
  }

  private void setRestart(String why)
  {
    // System.out.println("OC restart true " + why);
    restart = true;
    if (or != null)
    {
      or.setRedraw(true);
    }
  }

  /**
   * Draw the overview sequences
   * 
   * @param showSequenceFeatures
   *          true if sequence features are to be shown
   * @param showAnnotation
   *          true if the annotation is to be shown
   * @param featureRenderer
   *          the renderer to transfer feature colouring from
   */
  public void draw(boolean showSequenceFeatures, boolean showAnnotation,
          jalview.api.FeatureRenderer featureRenderer)
  {
    this.showSequenceFeatures = showSequenceFeatures;
    this.showAnnotation = showAnnotation;
    this.featureRenderer = featureRenderer;

    // System.out.println("OC draw " + ++ndraw + " showseqf="
    // + showSequenceFeatures + " showAnno=" + showAnnotation);

    if (showSequenceFeatures)
    {
      fr.transferSettings(featureRenderer);
    }

    setPreferredSize(new Dimension(od.getWidth(), od.getHeight()));

    AlignmentI al = av.getAlignment();
    or = new OverviewRenderer(panel.ap, fr, od, al,
            av.getResidueShading(), cf,
            progressPanel != null);
    if (progressPanel != null)
    {
      or.addPropertyChangeListener(progressPanel);
    }
    or.draw(od.getRows(al), od.getColumns(al));
  }

  void finalizeDraw(BufferedImage miniMe)
  {
    Graphics mg = miniMe.getGraphics();
    if (showAnnotation)
    {
      mg.translate(0, od.getSequencesHeight());
      or.drawGraph(mg, av.getAlignmentConservationAnnotation(),
              od.getGraphHeight(), od.getColumns(av.getAlignment()));
      mg.translate(0, -od.getSequencesHeight());
    }
    mg.dispose(); // BH 2019
    if (progressPanel != null)
    {
      or.removePropertyChangeListener(progressPanel);
    }
    or = null;
    if (restart)
    {
      restart = false;
      if (!disposed)
      {
        draw(showSequenceFeatures, showAnnotation, featureRenderer);
      }
    }
    else
    {
      updaterunning = false;
      lastMiniMe = miniMe;
      repaint();
    }

  }
  @Override
  public void paintComponent(Graphics g)
  {

    int w = getWidth();
    int h = getHeight();
    if (w == 0 || od.getBoxWidth() <= 0)
    {
      // BH 2019.07.27 removes two unnecessary paints, since boxwidth can be -1
      // or 0 during early-stage painting
      return;
    }

    boolean drawMe = (lastMiniMe != null);
    if (restart)
    {
      if (drawMe)
      {
        g.drawImage(lastMiniMe, 0, 0, w, h, this);
      }
      else
      {
        g.setColor(Color.white);
        g.fillRect(0, 0, w, h);
      }
      g.setColor(TRANS_GREY);
      g.fillRect(0, 0, w, h);
      drawMe = false;
    }
    else if (drawMe)
    {
      // is this a resize?
      if (w != od.getWidth() ||  h != od.getHeight()) {
      // if there is annotation, scale the alignment and annotation
      // separately
      if (od.getGraphHeight() <= 0 && od.getSequencesHeight() <= 0)
      {
        od.setWidth(w);
        od.setHeight(h);
        return;
      }
        // System.out.println("OC new subimages");
      BufferedImage topImage = lastMiniMe.getSubimage(0, 0, od.getWidth(),
              od.getSequencesHeight());
      BufferedImage bottomImage = lastMiniMe.getSubimage(0,
              od.getSequencesHeight(), od.getWidth(), od.getGraphHeight());

      // must be done at this point as we rely on using old width/height
      // above, and new width/height below
      od.setWidth(w);
      od.setHeight(h);

      // stick the images back together so lastMiniMe is consistent in the
      // event of a repaint - BUT probably not thread safe
      // System.out.println("OC new lastminime " + w + " " + h);
      lastMiniMe = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
      Graphics lg = lastMiniMe.getGraphics();
      lg.drawImage(topImage, 0, 0, w, od.getSequencesHeight(), null);
      lg.drawImage(bottomImage, 0, od.getSequencesHeight(), w,
              od.getGraphHeight(), this);
      lg.dispose();
      // BH 2019: removed -- this is now taken care of using vpbox in
      // OverviewDimension
      // // make sure the box is in the right place
      // od.setBoxPosition(av.getAlignment().getHiddenSequences(),
      // av.getAlignment().getHiddenColumns());
      }
    }

    if (drawMe)
    {
      g.drawImage(lastMiniMe, 0, 0, w, h, this);
    }
    // draw the box
    g.setColor(Color.red);
    // System.out.println("OC paintComponent nd=" + ndraw + " nr=" + nrepaint
    // + " np=" + ++npaint);
    od.drawBox(g);
  }

  private int ndraw, npaint, nrepaint;

  // @Override
  // public void repaint()
  // {
  // System.out.println("OC repaint " + (++nrepaint));
  // super.repaint();
  // }

  public void dispose()
  {
    disposed = true;
    od = null;
    synchronized (this)
    {
      setRestart("dispose");
    }
  }

}