package jalview.gui;

import jalview.datamodel.*;
import jalview.schemes.*;
import java.awt.*;
import java.util.*;

public class SequenceRenderer implements RendererI
{
  AlignViewport av;
  FontMetrics fm;
  boolean renderGaps = true;
  SequenceGroup currentSequenceGroup = null;
  Color color;

  public SequenceRenderer(AlignViewport av)
  {
    this.av = av;
  }


  public void renderGaps(boolean b)
  {
    renderGaps = b;
  }

  public Color getResidueBoxColour(ColourSchemeI cs, SequenceI seq, int i)
  {
   Color c = Color.white;
try{
     if (cs != null)
       c = cs.findColour(seq.getSequence(i, i + 1), i, av.getConsensus(false));
   }catch(Exception ex){}

    return c;
  }

  public void drawSequence(Graphics g,SequenceI seq,SequenceGroup sg, int start, int end, int x1, int y1, int width, int height, Vector pid, int seqnum)
  {
    currentSequenceGroup = sg;

    drawBoxes(g, seq, start, end, x1, y1, (int) width, height, pid);

    fm = g.getFontMetrics();
    drawText(g,seq,start,end,x1,y1,(int)width,height);

  }

  public void drawBoxes(Graphics g, SequenceI seq,int start, int end, int x1, int y1, int width, int height,Vector freq) {
    int i      = start;
    int length = seq.getLength();

    Color currentColor = Color.WHITE;

    int curStart = x1;
    int curWidth = width;

    while (i <= end && i < length)
    {
      color = color.white;

      if(inCurrentSequenceGroup(i))
      {
        if( currentSequenceGroup.getDisplayBoxes())
             color = getResidueBoxColour(currentSequenceGroup.cs, seq, i);
      }
      else if(av.getShowBoxes())
           color = getResidueBoxColour(av.getGlobalColourScheme(), seq, i);


      if (color != currentColor || color != null)
      {
        g.fillRect(x1+width*(curStart-start),y1,curWidth,height);

        currentColor = color;
        g.setColor(color);

        curStart = i;
        curWidth = width;
      }
      else
        curWidth += width;

      i++;
    }
    g.fillRect(x1+width*(curStart-start),y1,curWidth,height);
  }

  public void drawText(Graphics g, SequenceI seq,int start, int end, int x1, int y1, int width, int height)
  {
    int pady = height/5;
    int charOffset=0;
    g.setColor(Color.black);

    char s;
    // Need to find the sequence position here.
    for (int i = start; i <= end; i++)
    {
        if(i<seq.getLength())
          s = seq.getSequence().charAt(i);
        else
          s = ' ';

        if(!renderGaps && (s=='-' || s=='.' || s==' '))
          continue;

        g.setColor(Color.black);

        if (inCurrentSequenceGroup(i))
        {
          if(!currentSequenceGroup.getDisplayText())
            continue;

          if(currentSequenceGroup.getColourText())
            g.setColor(getResidueBoxColour(currentSequenceGroup.cs, seq, i).darker());
        }
        else
        {
          if(!av.getShowText())
            continue;

          if(av.getColourText())
            g.setColor(getResidueBoxColour(av.getGlobalColourScheme(), seq, i).darker());
        }

      charOffset =  (width - fm.charWidth(s))/2;
      g.drawString(String.valueOf(s), charOffset + x1 + width * (i - start), y1 + height - pady);
    }


  }

  boolean inCurrentSequenceGroup(int res)
  {
    if(currentSequenceGroup==null)
      return false;

    return (currentSequenceGroup.getStartRes()<=res && currentSequenceGroup.getEndRes()>=res)?true:false;
  }

  public void drawHighlightedText(Graphics g, SequenceI seq,int start, int end, int x1, int y1, int width, int height)
  {
    int pady = height/5;
    int charOffset=0;
    g.setColor(Color.BLACK);
    g.fillRect(x1,y1,width*(end-start+1),height);
    g.setColor(Color.white);

    char s='~';
    // Need to find the sequence position here.
    for (int i = start; i <= end; i++)
    {
       if(i<seq.getLength())
          s = seq.getSequence().charAt(i);

      charOffset =  (width - fm.charWidth(s))/2;
      g.drawString(String.valueOf(s), charOffset + x1 + width * (i - start), y1 + height - pady);
    }
  }


}