/*
 * Jalview - A Sequence Alignment Editor and Viewer (Version 2.7)
 * Copyright (C) 2011 J Procter, AM Waterhouse, J Engelhardt, LM Lui, 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 MCview;

import java.util.*;

import java.awt.*;

import jalview.analysis.*;
import jalview.datamodel.*;
import jalview.schemes.*;
import jalview.structure.StructureMapping;

public class PDBChain
{
  /**
   * SequenceFeature group for PDB File features added to sequences
   */
  private static final String PDBFILEFEATURE = "PDBFile";

  private static final String IEASTATUS = "IEA:jalview";

  public String id;

  public Vector bonds = new Vector();

  public Vector atoms = new Vector();

  public Vector residues = new Vector();

  public int offset;

  public Sequence sequence;

  public boolean isNa = false;

  public boolean isVisible = true;

  public int pdbstart = 0;

  public int pdbend = 0;

  public int seqstart = 0;

  public int seqend = 0;

  public String pdbid = "";

  public PDBChain(String pdbid, String id)
  {
    this.pdbid = pdbid.toLowerCase();
    this.id = id;
  }

  /**
   * character used to write newlines
   */
  protected String newline = System.getProperty("line.separator");

  public void setNewlineString(String nl)
  {
    newline = nl;
  }

  public String getNewlineString()
  {
    return newline;
  }

  public String print()
  {
    String tmp = "";

    for (int i = 0; i < bonds.size(); i++)
    {
      tmp = tmp + ((Bond) bonds.elementAt(i)).at1.resName + " "
              + ((Bond) bonds.elementAt(i)).at1.resNumber + " " + offset
              + newline;
    }

    return tmp;
  }

  /**
   * Annotate the residues with their corresponding positions in s1 using the
   * alignment in as
   * NOTE: This clears all atom.alignmentMapping values on the structure.
   * @param as
   * @param s1
   */
  public void makeExactMapping(AlignSeq as, SequenceI s1)
  {
    int pdbpos = as.getSeq2Start() - 2;
    int alignpos = s1.getStart() + as.getSeq1Start() - 3;
    // first clear out any old alignmentMapping values:
    for (Atom atom: (Vector<Atom>) atoms) { 
      atom.alignmentMapping=-1;
    }
    // and now trace the alignment onto the atom set.
    for (int i = 0; i < as.astr1.length(); i++)
    {
      if (as.astr1.charAt(i) != '-')
      {
        alignpos++;
      }

      if (as.astr2.charAt(i) != '-')
      {
        pdbpos++;
      }

      if (as.astr1.charAt(i) == as.astr2.charAt(i))
      {
        Residue res = (Residue) residues.elementAt(pdbpos);
        Enumeration en = res.atoms.elements();
        while (en.hasMoreElements())
        {
          Atom atom = (Atom) en.nextElement();
          atom.alignmentMapping = alignpos;
        }
      }
    }
  }

  /**
   * copy over the RESNUM seqfeatures from the internal chain sequence to the
   * mapped sequence
   * 
   * @param seq
   * @param status
   *          The Status of the transferred annotation
   * @return the features added to sq (or its dataset)
   */
  public SequenceFeature[] transferRESNUMFeatures(SequenceI seq,
          String status)
  {
    SequenceI sq = seq;
    while (sq != null && sq.getDatasetSequence() != null)
    {
      sq = sq.getDatasetSequence();
      if (sq == sequence)
      {
        return null;
      }
    }
    /**
     * Remove any existing features for this chain if they exist ?
     * SequenceFeature[] seqsfeatures=seq.getSequenceFeatures(); int
     * totfeat=seqsfeatures.length; // Remove any features for this exact chain
     * ? for (int i=0; i<seqsfeatures.length; i++) { }
     */
    if (status == null)
    {
      status = PDBChain.IEASTATUS;
    }
    SequenceFeature[] features = sequence.getSequenceFeatures();
    for (int i = 0; i < features.length; i++)
    {
      if (features[i].getFeatureGroup().equals(pdbid))
      {
        SequenceFeature tx = new SequenceFeature(features[i]);
        tx.setBegin(1 + ((Atom) ((Residue) residues.elementAt(tx.getBegin()
                - offset)).atoms.elementAt(0)).alignmentMapping);
        tx.setEnd(1 + ((Atom) ((Residue) residues.elementAt(tx.getEnd()
                - offset)).atoms.elementAt(0)).alignmentMapping);
        tx.setStatus(status
                + ((tx.getStatus() == null || tx.getStatus().length() == 0) ? ""
                        : ":" + tx.getStatus()));
        if (tx.begin != 0 && tx.end != 0)
          sq.addSequenceFeature(tx);
      }
    }
    return features;
  }

  public void makeCaBondList()
  {
    boolean na = false;
    int numNa = 0;
    for (int i = 0; i < (residues.size() - 1); i++)
    {
      Residue tmpres = (Residue) residues.elementAt(i);
      Residue tmpres2 = (Residue) residues.elementAt(i + 1);
      Atom at1 = tmpres.findAtom("CA");
      Atom at2 = tmpres2.findAtom("CA");
      na = false;
      if ((at1 == null) && (at2 == null))
      {
        na = true;
        at1 = tmpres.findAtom("P");
        at2 = tmpres2.findAtom("P");
      }
      if ((at1 != null) && (at2 != null))
      {
        if (at1.chain.equals(at2.chain))
        {
          if (na)
          {
            numNa++;
          }
          makeBond(at1, at2);
        }
      }
      else
      {
        System.out.println("not found " + i);
      }
    }
    if (numNa > 0 && ((numNa / residues.size()) > 0.99))
    {
      isNa = true;
    }
  }

  public void makeBond(Atom at1, Atom at2)
  {
    float[] start = new float[3];
    float[] end = new float[3];

    start[0] = at1.x;
    start[1] = at1.y;
    start[2] = at1.z;

    end[0] = at2.x;
    end[1] = at2.y;
    end[2] = at2.z;

    bonds.addElement(new Bond(start, end, at1, at2));
  }

  public void makeResidueList()
  {
    int count = 0;
    Object symbol;
    boolean deoxyn=false;
    boolean nucleotide = false;
    StringBuffer seq = new StringBuffer();
    Vector resFeatures = new Vector();
    Vector resAnnotation = new Vector();
    int i, iSize = atoms.size() - 1;
    int resNumber = -1;
    for (i = 0; i <= iSize; i++)
    {
      Atom tmp = (Atom) atoms.elementAt(i);
      resNumber = tmp.resNumber;
      int res = resNumber;

      if (i == 0)
      {
        offset = resNumber;
      }

      Vector resAtoms = new Vector();
      // Add atoms to a vector while the residue number
      // remains the same as the first atom's resNumber (res)
      while ((resNumber == res) && (i < atoms.size()))
      {
        resAtoms.addElement((Atom) atoms.elementAt(i));
        i++;

        if (i < atoms.size())
        {
          resNumber = ((Atom) atoms.elementAt(i)).resNumber;
        }
        else
        {
          resNumber++;
        }
      }

      // We need this to keep in step with the outer for i = loop
      i--;

      // Make a new Residue object with the new atoms vector
      residues.addElement(new Residue(resAtoms, resNumber - 1, count));

      Residue tmpres = (Residue) residues.lastElement();
      Atom tmpat = (Atom) tmpres.atoms.elementAt(0);
      // Make A new SequenceFeature for the current residue numbering
      SequenceFeature sf = new SequenceFeature("RESNUM", tmpat.resName
              + ":" + tmpat.resNumIns + " " + pdbid + id, "", offset
              + count, offset + count, pdbid);
      // MCview.PDBChain.PDBFILEFEATURE);
      resFeatures.addElement(sf);
      resAnnotation.addElement(new Annotation(tmpat.tfactor));
      // Keep totting up the sequence
      if ((symbol = ResidueProperties.getAA3Hash().get(tmpat.resName)) == null)
      {
        String nucname = tmpat.resName.trim();
        // use the aaIndex rather than call 'toLower' - which would take a bit more time.
        deoxyn=nucname.length()==2 && ResidueProperties.aaIndex[nucname.charAt(0)]==ResidueProperties.aaIndex['D'];
        if (tmpat.name.equalsIgnoreCase("CA")
                || ResidueProperties.nucleotideIndex[nucname.charAt((deoxyn ? 1 : 0))] == -1)
        {
          seq.append("X");
          // System.err.println("PDBReader:Null aa3Hash for " +
          // tmpat.resName);
        }
        else
        {
          // nucleotide flag
          nucleotide = true;
          seq.append(nucname.charAt((deoxyn ? 1 : 0)));
        }
      }
      else
      {
        if (nucleotide)
        {
          System.err
                  .println("Warning: mixed nucleotide and amino acid chain.. its gonna do bad things to you!");
        }
        seq.append(ResidueProperties.aa[((Integer) symbol).intValue()]);
      }
      count++;
    }

    if (id.length() < 1)
    {
      id = " ";
    }
    isNa = nucleotide;
    sequence = new Sequence(id, seq.toString(), offset, resNumber - 1); // Note:
    // resNumber-offset
    // ~=
    // seq.size()
    // Add normalised feature scores to RESNUM indicating start/end of sequence
    // sf.setScore(offset+count);

    // System.out.println("PDB Sequence is :\nSequence = " + seq);
    // System.out.println("No of residues = " + residues.size());
    for (i = 0, iSize = resFeatures.size(); i < iSize; i++)
    {
      sequence.addSequenceFeature((SequenceFeature) resFeatures
              .elementAt(i));
      resFeatures.setElementAt(null, i);
    }
    Annotation[] annots = new Annotation[resAnnotation.size()];
    float max = 0;
    for (i = 0, iSize = annots.length; i < iSize; i++)
    {
      annots[i] = (Annotation) resAnnotation.elementAt(i);
      if (annots[i].value > max)
        max = annots[i].value;
      resAnnotation.setElementAt(null, i);
    }
    AlignmentAnnotation tfactorann = new AlignmentAnnotation(
            "PDB.TempFactor", "Temperature Factor for "
                    + sequence.getName(), annots, 0, max,
            AlignmentAnnotation.LINE_GRAPH);
    tfactorann.setSequenceRef(sequence);
    sequence.addAlignmentAnnotation(tfactorann);
  }

  public void setChargeColours()
  {
    for (int i = 0; i < bonds.size(); i++)
    {
      try
      {
        Bond b = (Bond) bonds.elementAt(i);

        if (b.at1.resName.equalsIgnoreCase("ASP")
                || b.at1.resName.equalsIgnoreCase("GLU"))
        {
          b.startCol = Color.red;
        }
        else if (b.at1.resName.equalsIgnoreCase("LYS")
                || b.at1.resName.equalsIgnoreCase("ARG"))
        {
          b.startCol = Color.blue;
        }
        else if (b.at1.resName.equalsIgnoreCase("CYS"))
        {
          b.startCol = Color.yellow;
        }
        else
        {
          b.startCol = Color.lightGray;
        }

        if (b.at2.resName.equalsIgnoreCase("ASP")
                || b.at2.resName.equalsIgnoreCase("GLU"))
        {
          b.endCol = Color.red;
        }
        else if (b.at2.resName.equalsIgnoreCase("LYS")
                || b.at2.resName.equalsIgnoreCase("ARG"))
        {
          b.endCol = Color.blue;
        }
        else if (b.at2.resName.equalsIgnoreCase("CYS"))
        {
          b.endCol = Color.yellow;
        }
        else
        {
          b.endCol = Color.lightGray;
        }
      } catch (Exception e)
      {
        Bond b = (Bond) bonds.elementAt(i);
        b.startCol = Color.gray;
        b.endCol = Color.gray;
      }
    }
  }

  public void setChainColours(jalview.schemes.ColourSchemeI cs)
  {
    Bond b;
    int index;
    for (int i = 0; i < bonds.size(); i++)
    {
      try
      {
        b = (Bond) bonds.elementAt(i);

        index = ((Integer) ResidueProperties.aa3Hash.get(b.at1.resName))
                .intValue();
        b.startCol = cs.findColour(ResidueProperties.aa[index].charAt(0));

        index = ((Integer) ResidueProperties.aa3Hash.get(b.at2.resName))
                .intValue();
        b.endCol = cs.findColour(ResidueProperties.aa[index].charAt(0));

      } catch (Exception e)
      {
        b = (Bond) bonds.elementAt(i);
        b.startCol = Color.gray;
        b.endCol = Color.gray;
      }
    }
  }

  public void setChainColours(Color col)
  {
    for (int i = 0; i < bonds.size(); i++)
    {
      Bond tmp = (Bond) bonds.elementAt(i);
      tmp.startCol = col;
      tmp.endCol = col;
    }
  }

  public AlignmentAnnotation[] transferResidueAnnotation(SequenceI seq,
          String status)
  {
    AlignmentAnnotation[] transferred = null;

    return transferred;

  }

  /**
   * copy any sequence annotation onto the sequence mapped using the provided
   * StructureMapping
   * 
   * @param mapping
   */
  public void transferResidueAnnotation(StructureMapping mapping)
  {
    SequenceI sq = mapping.getSequence();
    if (sq != null)
    {
      if (sequence != null && sequence.getAnnotation() != null)
      {

      }
      float min = -1, max = 0;
      Annotation[] an = new Annotation[sq.getEnd() - sq.getStart() + 1];
      for (int i = sq.getStart(), j = sq.getEnd(), k = 0; i <= j; i++, k++)
      {
        int prn = mapping.getPDBResNum(k + 1);

        an[k] = new Annotation((float) prn);
        if (min == -1)
        {
          min = k;
          max = k;
        }
        else
        {
          if (min > k)
          {
            min = k;
          }
          else if (max < k)
          {
            max = k;
          }
        }
      }
      sq.addAlignmentAnnotation(new AlignmentAnnotation("PDB.RESNUM",
              "PDB Residue Numbering for " + this.pdbid + ":" + this.id,
              an, (float) min, (float) max, AlignmentAnnotation.LINE_GRAPH));
    }
  }
}