/*
 * 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 jalview.analysis;

import java.io.*;

import jalview.datamodel.*;
import jalview.math.*;

/**
 * Performs Principal Component Analysis on given sequences
 * 
 * @author $author$
 * @version $Revision$
 */
public class PCA implements Runnable
{
  Matrix m;

  Matrix symm;

  Matrix m2;

  double[] eigenvalue;

  Matrix eigenvector;

  StringBuffer details = new StringBuffer();

  /**
   * Creates a new PCA object.
   * 
   * @param s
   *          Set of sequences to perform PCA on
   */
  public PCA(String[] s)
  {

    BinarySequence[] bs = new BinarySequence[s.length];
    int ii = 0;

    while ((ii < s.length) && (s[ii] != null))
    {
      bs[ii] = new BinarySequence(s[ii]);
      bs[ii].encode();
      ii++;
    }

    BinarySequence[] bs2 = new BinarySequence[s.length];
    ii = 0;

    while ((ii < s.length) && (s[ii] != null))
    {
      bs2[ii] = new BinarySequence(s[ii]);
      bs2[ii].blosumEncode();
      ii++;
    }

    // System.out.println("Created binary encoding");
    // printMemory(rt);
    int count = 0;

    while ((count < bs.length) && (bs[count] != null))
    {
      count++;
    }

    double[][] seqmat = new double[count][bs[0].getDBinary().length];
    double[][] seqmat2 = new double[count][bs2[0].getDBinary().length];
    int i = 0;

    while (i < count)
    {
      seqmat[i] = bs[i].getDBinary();
      seqmat2[i] = bs2[i].getDBinary();
      i++;
    }

    // System.out.println("Created array");
    // printMemory(rt);
    // System.out.println(" --- Original matrix ---- ");
    m = new Matrix(seqmat, count, bs[0].getDBinary().length);
    m2 = new Matrix(seqmat2, count, bs2[0].getDBinary().length);

  }

  /**
   * Returns the matrix used in PCA calculation
   * 
   * @return java.math.Matrix object
   */

  public Matrix getM()
  {
    return m;
  }

  /**
   * Returns Eigenvalue
   * 
   * @param i
   *          Index of diagonal within matrix
   * 
   * @return Returns value of diagonal from matrix
   */
  public double getEigenvalue(int i)
  {
    return eigenvector.d[i];
  }

  /**
   * DOCUMENT ME!
   * 
   * @param l
   *          DOCUMENT ME!
   * @param n
   *          DOCUMENT ME!
   * @param mm
   *          DOCUMENT ME!
   * @param factor
   *          DOCUMENT ME!
   * 
   * @return DOCUMENT ME!
   */
  public float[][] getComponents(int l, int n, int mm, float factor)
  {
    float[][] out = new float[m.rows][3];

    for (int i = 0; i < m.rows; i++)
    {
      out[i][0] = (float) component(i, l) * factor;
      out[i][1] = (float) component(i, n) * factor;
      out[i][2] = (float) component(i, mm) * factor;
    }

    return out;
  }

  /**
   * DOCUMENT ME!
   * 
   * @param n
   *          DOCUMENT ME!
   * 
   * @return DOCUMENT ME!
   */
  public double[] component(int n)
  {
    // n = index of eigenvector
    double[] out = new double[m.rows];

    for (int i = 0; i < m.rows; i++)
    {
      out[i] = component(i, n);
    }

    return out;
  }

  /**
   * DOCUMENT ME!
   * 
   * @param row
   *          DOCUMENT ME!
   * @param n
   *          DOCUMENT ME!
   * 
   * @return DOCUMENT ME!
   */
  double component(int row, int n)
  {
    double out = 0.0;

    for (int i = 0; i < symm.cols; i++)
    {
      out += (symm.value[row][i] * eigenvector.value[i][n]);
    }

    return out / eigenvector.d[n];
  }

  public String getDetails()
  {
    return details.toString();
  }

  /**
   * DOCUMENT ME!
   */
  public void run()
  {
    Matrix mt = m.transpose();

    details.append(" --- OrigT * Orig ---- \n");
    // eigenvector = mt.preMultiply(m); // standard seqspace comparison matrix
    eigenvector = mt.preMultiply(m2); // jalview variation on seqsmace method

    PrintStream ps = new PrintStream(System.out)
    {
      public void print(String x)
      {
        details.append(x);
      }

      public void println()
      {
        details.append("\n");
      }
    };

    eigenvector.print(ps);

    symm = eigenvector.copy();

    eigenvector.tred();

    details.append(" ---Tridiag transform matrix ---\n");
    details.append(" --- D vector ---\n");
    eigenvector.printD(ps);
    ps.println();
    details.append("--- E vector ---\n");
    eigenvector.printE(ps);
    ps.println();

    // Now produce the diagonalization matrix
    eigenvector.tqli();

    details.append(" --- New diagonalization matrix ---\n");
    eigenvector.print(ps);
    details.append(" --- Eigenvalues ---\n");
    eigenvector.printD(ps);
    ps.println();
    /*
     * for (int seq=0;seq<symm.rows;seq++) { ps.print("\"Seq"+seq+"\""); for
     * (int ev=0;ev<symm.rows; ev++) {
     * 
     * ps.print(","+component(seq, ev)); } ps.println(); }
     */
  }
}