/*
 * Copyright (c) 2007-2011 by The Broad Institute of MIT and Harvard.  All Rights Reserved.
 *
 * This software is licensed under the terms of the GNU Lesser General Public License (LGPL),
 * Version 2.1 which is available at http://www.opensource.org/licenses/lgpl-2.1.php.
 *
 * THE SOFTWARE IS PROVIDED "AS IS." THE BROAD AND MIT MAKE NO REPRESENTATIONS OR
 * WARRANTES OF ANY KIND CONCERNING THE SOFTWARE, EXPRESS OR IMPLIED, INCLUDING,
 * WITHOUT LIMITATION, WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
 * PURPOSE, NONINFRINGEMENT, OR THE ABSENCE OF LATENT OR OTHER DEFECTS, WHETHER
 * OR NOT DISCOVERABLE.  IN NO EVENT SHALL THE BROAD OR MIT, OR THEIR RESPECTIVE
 * TRUSTEES, DIRECTORS, OFFICERS, EMPLOYEES, AND AFFILIATES BE LIABLE FOR ANY DAMAGES
 * OF ANY KIND, INCLUDING, WITHOUT LIMITATION, INCIDENTAL OR CONSEQUENTIAL DAMAGES,
 * ECONOMIC DAMAGES OR INJURY TO PROPERTY AND LOST PROFITS, REGARDLESS OF WHETHER
 * THE BROAD OR MIT SHALL BE ADVISED, SHALL HAVE OTHER REASON TO KNOW, OR IN FACT
 * SHALL KNOW OF THE POSSIBILITY OF THE FOREGOING.
 */

package org.broad.igv.sam;

import org.apache.log4j.Logger;
import org.broad.igv.feature.genome.Genome;
import org.broad.igv.ui.IGV;

/**
* @author jrobinso
* @date Feb 23, 2011
*/
public class AlignmentCounts {

    private static Logger log = Logger.getLogger(AlignmentCounts.class);
    
    String genomeId;
    //String chr;
    int start;
    int end;
    byte[] reference;
    // counts
    int[] posA;
    int[] posT;
    int[] posC;
    int[] posG;
    int[] posN;
    int[] negA;
    int[] negT;
    int[] negC;
    int[] negG;
    int[] negN;
    int[] qA;
    int[] qT;
    int[] qC;
    int[] qG;
    int[] qN;
    int[] posTotal;
    int[] negTotal;
    private int[] totalQ;
    private int maxCount = 0;

    public AlignmentCounts(String chr, int start, int end) {

        Genome genome = IGV.getInstance().getGenomeManager().getCurrentGenome();
        this.genomeId = genome.getId();
        String chrAlias = genome.getChromosomeAlias(chr);
        this.start = start;
        this.end = end;
        reference = genome.getSequence(chrAlias, start, end);

        int nPts = end - start;
        posA = new int[nPts];
        posT = new int[nPts];
        posC = new int[nPts];
        posG = new int[nPts];
        posN = new int[nPts];
        posTotal = new int[nPts];
        negA = new int[nPts];
        negT = new int[nPts];
        negC = new int[nPts];
        negG = new int[nPts];
        negN = new int[nPts];
        negTotal = new int[nPts];
        qA = new int[nPts];
        qT = new int[nPts];
        qC = new int[nPts];
        qG = new int[nPts];
        qN = new int[nPts];
        totalQ = new int[nPts];
    }

    public int getTotalCount(int pos) {
        int offset = pos - start;
        if (offset < 0 || offset >= posA.length) {
            if (log.isDebugEnabled()) {
                log.debug("Position out of range: " + pos + " (valid range - " + start + "-" + end);
            }
            return 0;
        } else {
            return posTotal[offset] + negTotal[offset];

        }
    }

    public int getNegTotal(int pos) {
        int offset = pos - start;
        if (offset < 0 || offset >= posA.length) {
            if (log.isDebugEnabled()) {
                log.debug("Position out of range: " + pos + " (valid range - " + start + "-" + end);
            }
            return 0;
        } else {
            return negTotal[offset];

        }
    }

    public int getPosTotal(int pos) {
        int offset = pos - start;
        if (offset < 0 || offset >= posA.length) {
            if (log.isDebugEnabled()) {
                log.debug("Position out of range: " + pos + " (valid range - " + start + "-" + end);
            }
            return 0;
        } else {
            return posTotal[offset];

        }
    }

    public int getTotalQuality(int pos) {
        int offset = pos - start;
        if (offset < 0 || offset >= posA.length) {
            if (log.isDebugEnabled()) {
                log.debug("Position out of range: " + pos + " (valid range - " + start + "-" + end);
            }
            return 0;
        } else {
            return totalQ[offset];

        }
    }

    public int getAvgQuality(int pos) {
        int count = getTotalCount(pos);
        return count == 0 ? 0 : getTotalQuality(pos) / count;
    }

    public byte getReference(int pos) {
        if (reference == null) {
            return 0;
        }
        int offset = pos - start;
        if (offset < 0 || offset >= reference.length) {
            if (log.isDebugEnabled()) {
                log.debug("Position out of range: " + pos + " (valid range - " + start + "-" + end);
            }
            return 0;
        } else {
            return reference[offset];
        }
    }

    public int getCount(int pos, byte b) {
        int offset = pos - start;
        if (offset < 0 || offset >= posA.length) {
            if (log.isDebugEnabled()) {
                log.debug("Position out of range: " + pos + " (valid range - " + start + "-" + end);
            }
            return 0;
        } else {
            switch (b) {
                case 'a':
                case 'A':
                    return posA[offset] + negA[offset];
                case 't':
                case 'T':
                    return posT[offset] + negT[offset];
                case 'c':
                case 'C':
                    return posC[offset] + negC[offset];
                case 'g':
                case 'G':
                    return posG[offset] + negG[offset];
                case 'n':
                case 'N':
                    return posN[offset] + negN[offset];
            }
            log.debug("Unknown nucleotide: " + b);
            return 0;
        }
    }

    public int getNegCount(int pos, byte b) {
        int offset = pos - start;
        if (offset < 0 || offset >= posA.length) {
            if (log.isDebugEnabled()) {
                log.debug("Position out of range: " + pos + " (valid range - " + start + "-" + end);
            }
            return 0;
        } else {
            switch (b) {
                case 'a':
                case 'A':
                    return negA[offset];
                case 't':
                case 'T':
                    return negT[offset];
                case 'c':
                case 'C':
                    return negC[offset];
                case 'g':
                case 'G':
                    return negG[offset];
                case 'n':
                case 'N':
                    return negN[offset];
            }
            log.error("Unknown nucleotide: " + b);
            return 0;
        }
    }

    public int getPosCount(int pos, byte b) {
        int offset = pos - start;
        if (offset < 0 || offset >= posA.length) {
            if (log.isDebugEnabled()) {
                log.debug("Position out of range: " + pos + " (valid range - " + start + "-" + end);
            }
            return 0;
        } else {
            switch (b) {
                case 'a':
                case 'A':
                    return posA[offset];
                case 't':
                case 'T':
                    return posT[offset];
                case 'c':
                case 'C':
                    return posC[offset];
                case 'g':
                case 'G':
                    return posG[offset];
                case 'n':
                case 'N':
                    return posN[offset];
            }
            log.error("Unknown nucleotide: " + b);
            return 0;
        }
    }

    public int getQuality(int pos, byte b) {
        int offset = pos - start;
        if (offset < 0 || offset >= posA.length) {
            log.error("Position out of range: " + pos + " (valid range - " + start + "-" + end);
            return 0;
        } else {
            switch (b) {
                case 'a':
                case 'A':
                    return qA[offset];
                case 't':
                case 'T':
                    return qT[offset];
                case 'c':
                case 'C':
                    return qC[offset];
                case 'g':
                case 'G':
                    return qG[offset];
                case 'n':
                case 'N':
                    return qN[offset];
            }
            log.error("Unknown nucleotide: " + posN);
            return 0;
        }
    }

    public int getAvgQuality(int pos, byte b) {
        int count = getCount(pos, b);
        return count == 0 ? 0 : getQuality(pos, b) / count;
    }


    // For alignments without blocks -- TODO refactor, this is ugly

    void incCounts(Alignment alignment) {
        int start = alignment.getAlignmentStart();
        int end = alignment.getAlignmentEnd();

        AlignmentBlock[] blocks = alignment.getAlignmentBlocks();
        if (blocks != null) {
            for (AlignmentBlock b : blocks) {
                // Don't count softclips
                if (!b.isSoftClipped())
                    incCounts(b, alignment.isNegativeStrand());
            }
        } else {
            for (int pos = start; pos < end; pos++) {
                byte q = 0;
                incCount(pos, (byte) 'n', q, alignment.isNegativeStrand());
            }
        }
    }


    private void incCounts(AlignmentBlock block, boolean isNegativeStrand) {
        int start = block.getStart();
        byte[] bases = block.getBases();
        if (bases != null) {
            for (int i = 0; i < bases.length; i++) {
                int pos = start + i;
                // NOTE:  the direct access block.qualities is intentional,  profiling reveals this to be a critical bottleneck
                byte q = block.qualities[i];
                // TODO -- handle "="
                byte n = bases[i];
                incCount(pos, n, q, isNegativeStrand);
            }
        }
    }

    private void incCount(int pos, byte b, byte q, boolean isNegativeStrand) {

        int offset = pos - start;
        if (offset >= 0 && offset < posA.length) {
            switch (b) {
                case 'a':
                case 'A':
                    if (isNegativeStrand) {
                        negA[offset] = negA[offset] + 1;
                    } else {
                        posA[offset] = posA[offset] + 1;
                    }
                    qA[offset] = qA[offset] + q;
                    break;
                case 't':
                case 'T':
                    if (isNegativeStrand) {
                        negT[offset] = negT[offset] + 1;
                    } else {
                        posT[offset] = posT[offset] + 1;
                    }
                    qT[offset] = qT[offset] + q;
                    break;
                case 'c':
                case 'C':
                    if (isNegativeStrand) {
                        negC[offset] = negC[offset] + 1;
                    } else {
                        posC[offset] = posC[offset] + 1;
                    }
                    qC[offset] = qC[offset] + q;
                    break;
                case 'g':
                case 'G':
                    if (isNegativeStrand) {
                        negG[offset] = negG[offset] + 1;
                    } else {
                        posG[offset] = posG[offset] + 1;
                    }
                    qG[offset] = qG[offset] + q;
                    break;
                case 'n':
                case 'N':
                    if (isNegativeStrand) {
                        negN[offset] = negN[offset] + 1;
                    } else {
                        posN[offset] = posN[offset] + 1;
                    }
                    qN[offset] = qN[offset] + q;

            }
            if (isNegativeStrand) {
                negTotal[offset] = negTotal[offset] + 1;
            } else {
                posTotal[offset] = posTotal[offset] + 1;
            }
            totalQ[offset] = totalQ[offset] + q;

            maxCount = Math.max(posTotal[offset] + negTotal[offset], maxCount);
        }
    }

    /**
     * @return the start
     */
    public int getStart() {
        return start;
    }

    /**
     * @return the end
     */
    public int getEnd() {
        return end;
    }

    /**
     * @return the totalQ
     */
    public int[] getTotalQ() {
        return totalQ;
    }

    /**
     * @return the maxCount
     */
    public int getMaxCount() {
        return maxCount;
    }
}
