homo.cpp

/*
 * homo.cpp for MSIsensor 
 * Copyright (c) 2013 Beifang Niu && Kai Ye WUGSC All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person
 * obtaining a copy of this software and associated documentation
 * files (the "Software"), to deal in the Software without
 * restriction, including without limitation the rights to use,
 * copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following
 * conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */

#include <iostream>
#include <sstream>
#include <bitset>
#include <omp.h>
#include <cmath>

#include "homo.h"
#include "polyscan.h"
#include "somatic.h"

extern Param param;
extern Param paramd;
extern PolyScan polyscan;
extern char homo_code[];

HomoSite::HomoSite()
    : homoType(0)
    , length(0)
    , frontKmer(0)
    , endKmer(0)
    , typeLen(0)
    , chr("")
    , transfer("")
    , bases("")
    , fbases("")
    , ebases("")
    , location(0)
    , lowcut(0)
    , highcut(0)
    , normalDis(NULL)
    , tumorDis(NULL)
    ////////////
    , normalCov( 0 )
    , tumorCov( 0 )
    , withSufCov( false )
    , normalWithSufCov( false )
    , dif( 0.0 )
    , pValue( 0.0 )
    , somatic( false )
    , withGenotype( false )   
{
    InitType();
};

HomoSite::~HomoSite() {
    // xxxxx
};

// transfer binary to string
void HomoSite::TransferString() {
    // assign memory
    //chr.resize(MAX_TRANSFER_LINE_LENGTH);
    std::stringstream ss;
    bit8_t tch = 0;
    char tchbuff[MAX_FLANK_REGION];
    for (int i=typeLen-1; i>=0; i--) {
        tch = 0;
        tch = homoType&3;
        tchbuff[i] = homo_code[tch];
        homoType = homoType>>2;
    }
    // load type
    for (int i=0; i<typeLen; i++) {
        ss<<tchbuff[i];
    }
    ss << '\t';
    for (int i=param.ContextLength-1; i>=0; i--) {
        tch = 0;
        tch = frontKmer&3;
        tchbuff[i] = homo_code[tch];
        frontKmer = frontKmer>>2;
    }
    // load front flank region
    for (int i=0; i<param.ContextLength; i++) {
        ss<<tchbuff[i];
    }
    ss << '\t';
    for (int i=param.ContextLength-1; i>=0; i--) {
        tch = 0;
        tch = endKmer&3;
        tchbuff[i] = homo_code[tch];
        endKmer = endKmer>>2;
    }
    // load end flank region
    for (int i=0; i<param.ContextLength; i++) {
        ss<<tchbuff[i];
    }
    transfer = ss.str();
    
    ss.clear();
    ss.str("");
}

// initial distribution
void HomoSite::InitialDis() {
    normalDis = new unsigned short *[polyscan.totalBamPairsNum];
    tumorDis  = new unsigned short *[polyscan.totalBamPairsNum];
    for (unsigned int j=0; j<polyscan.totalBamPairsNum; j++) {
        normalDis[j] = new unsigned short [paramd.s_dispots];
        tumorDis[j]  = new unsigned short [paramd.s_dispots];
        for (unsigned int k=0; k<paramd.s_dispots; k++) {
            normalDis[j][k] = 0;
            tumorDis[j][k]  = 0;
        }
    }
}

// Out distribution
void HomoSite::OutputDis() {
    for (unsigned int j=0; j<polyscan.totalBamPairsNum; j++) {
        for (unsigned int k=0; k<paramd.s_dispots; k++) {
            std::cout<<normalDis[j][k];
        }
        for (unsigned int k=0; k<paramd.s_dispots; k++) {
            std::cout<<tumorDis[j][k];
        }
    }
}

// Pourout distribution
void HomoSite::PouroutDis(Sample &sample) {
    sample.outputDistribution << chr << " "
         << location << " "
         << fbases << " "
         << length << "["
         << bases  << "] "
         << ebases <<"\n";

    for (unsigned int j=0; j<polyscan.totalBamPairsNum; j++) {
        sample.outputDistribution << "N: ";
        for (unsigned int k=0; k<paramd.s_dispots; k++) {
            sample.outputDistribution << normalDis[j][k] << " ";
        }
        sample.outputDistribution << "\nT: ";
        for (unsigned int k=0; k<paramd.s_dispots; k++) {
            sample.outputDistribution << tumorDis[j][k] << " ";
        }
    }
    sample.outputDistribution << "\n";
}

// initial bools
void HomoSite::BoolsInitial() {
    withSufCov = normalWithSufCov = somatic = withGenotype = false;
}

// genotyping analyis
void HomoSite::DisGenotyping(Sample &sample) {
    /////// genotyping //////////
    // BoolsInitial();
    // Total sites
    ////////////////////////////
    sample.numberOftotalSites++;
    ///////////////////////////
    bool reportSomatic, reportGermline;
    reportSomatic = reportGermline = false;
    // update all 
    normalCov = tumorCov = 0;
    for (unsigned int j=0; j<polyscan.totalBamPairsNum; j++) {
        for (unsigned int k=0; k<paramd.s_dispots; k++) {
            normalCov += normalDis[j][k];
            tumorCov  += tumorDis[j][k];
        }
    }

    normalWithSufCov = (normalCov >= param.covCutoff) ? true : false;
    
    if ( normalWithSufCov && (tumorCov >= param.covCutoff) ) {
       withSufCov = true;
       dif = DistanceBetweenTwo( normalDis[0], tumorDis[0] );
       pValue = X2BetweenTwo( normalDis[0], tumorDis[0], param.s_dispots );
       // if (pValue < 0.001) somatic = true;
       // add one for FDR
       somatic = true;

    } else {

        withSufCov = false;
        dif = -1.0;
        pValue = 1;
    }
    // compute genotype
    ComputeGenotype( normalDis[0] );
    ///////////////////////////////////
    unsigned PairIndex = 0;
    if ( withSufCov  ) {
        sample.numberOfDataPoints++;
        //sample.outputPSomatic << log10( pValue ) << std::endl;
        //if ( somatic ) sample.numberOfMsiDataPoints++;
    }

    if ( withGenotype ) reportGermline = true;
    if ( somatic ) reportSomatic = true;

    if ( reportSomatic ) {
        /*
        sample.outputSomatic << chr << "\t" 
                             << location << "\t" 
                             << fbases << "\t" 
                             << length << "\t"
                             << bases << "\t" 
                             << ebases;
        sample.outputSomatic << "\t" << std::fixed << dif << "\t"<< std::fixed << pValue;
        sample.outputSomatic << std::endl;
        */
        // record for FDR analysis 
        // instead of report it directly
        SomaticSite onessite;
        onessite.chr = chr;
        onessite.location = location;
        onessite.length = length;
        onessite.fbases = fbases;
        onessite.ebases = ebases;
        onessite.bases = bases;
        onessite.diff = dif;
        onessite.pValue = pValue;

        sample.totalSomaticSites.push_back( onessite );
    }

    if ( reportGermline ) {
        sample.outputGermline << chr << "\t" 
                              << location << "\t" 
                              << fbases << "\t" 
                              << length << "\t" 
                              << bases << "\t" 
                              << ebases;
        sample.outputGermline << "\t" << genotype[0] << "|" << genotype[1];
        sample.outputGermline << std::endl;
    }

}

// distance
double HomoSite::DistanceBetweenTwo( unsigned short * FirstOriginal, unsigned short * SecondOriginal ) {
    double SmallDouble = 0.0000000001;
    // declare 
    double *Min, *Max, *FirstNormalized, *SecondNormalized, AreaMin, AreaMax;
    unsigned int dispots, sumFirst, sumSecond;
    dispots = param.s_dispots;
    FirstNormalized   = new double [dispots + 2];
    SecondNormalized  = new double [dispots + 2];
    sumFirst = sumSecond = 0;
    // sum 
    for (unsigned i = 0; i< dispots; i++) {
        sumFirst  += FirstOriginal[i];
        sumSecond += SecondOriginal[i];
    }
    // normalization
    for (unsigned i = 0; i < dispots; i++) {
        if (FirstOriginal[i] < 1) FirstNormalized[i]  = 0.0;
        else FirstNormalized[i]  = (FirstOriginal[i] / (double)sumFirst);
	if (SecondOriginal[i] < 1) SecondNormalized[i] = 0.0;
        else SecondNormalized[i] = SecondOriginal[i] / (double)sumSecond;
    }
    FirstNormalized[dispots]  = SecondNormalized[dispots] = 0.0;
    Min  = new double [dispots + 2];
    Max  = new double [dispots + 2];
    // initialization 
    for (unsigned i=0; i<=dispots; i++) Min[i] = Max[i] = 0;
    // get min and max per position
    for (unsigned i=0; i<=dispots; i++) {
        if (FirstNormalized[i] <= SecondNormalized[i]) {
            Min[i] = FirstNormalized[i];
            Max[i] = SecondNormalized[i];
        } else {
            Min[i] = SecondNormalized[i];
            Max[i] = FirstNormalized[i];
        }
	if (Min[i] < SmallDouble) Min[i] = 0.0;
	if (Max[i] < SmallDouble) Max[i] = 0.0;
    }

    // caculate area
    AreaMin =  AreaMax = 0.0;
    for (unsigned i=0; i< dispots; i++) {
        AreaMin += (Min[i] + Min[i + 1]);
        AreaMax += (Max[i] + Max[i + 1]);
    }
    if (AreaMax < AreaMin) {
	std::cerr << "something is wrong with distance calculation " << AreaMax << " " << AreaMin << std::endl;
	for (unsigned index = 0; index < 100; index++) {
		std::cerr << index << "\t" 
                          << FirstOriginal[index] << "\t" 
                          << SecondOriginal[index] << "\t" 
                          << sumFirst << "\t" 
                          << sumSecond << "\t" 
                          << FirstNormalized[index] << "\t" 
                          << SecondNormalized[index] << "\t" 
                          << Min[index] << "\t" 
                          << Max[index] 
                          << std::endl;
	}
    }
    delete [] Min;
    delete [] Max;

    delete [] FirstNormalized;
    delete [] SecondNormalized;

    return (AreaMax - AreaMin)/AreaMax;
}

void HomoSite::ComputeGenotype( unsigned short * NormalReadCount ) {
    unsigned int Offset, CoverageCutoff, first, second, Sum;
    Offset = 1; CoverageCutoff = param.covCutoff;
    first = second = Sum = 0;

    // find the largest number 
    for (unsigned int pos_index = 0; pos_index < param.s_dispots; pos_index++) { 
        // NormalReadCount
        Sum += NormalReadCount[pos_index];
        if (NormalReadCount[pos_index] > NormalReadCount[first]) first = pos_index;
    }

    if (Sum < CoverageCutoff) {
        genotype[0] = genotype[1] = -1;
        withGenotype = false;
        return;
    }

    if (first == 0) second = 1;
    for (unsigned int pos_index = 0; pos_index < param.s_dispots; pos_index++) {
        if (pos_index == first) continue; 
        if (NormalReadCount[pos_index] > NormalReadCount[second]) second = pos_index;
    }
    float first_ratio  = NormalReadCount[first]  / (float) Sum;
    float second_ratio = NormalReadCount[second] / (float) Sum;

    if (first_ratio > 0.7) {
        genotype[0] = genotype[1]  = first + Offset;
        withGenotype = true; 
    }
    else if (first_ratio > 0.3 && second_ratio < first_ratio * 0.66) {
        genotype[0] =  genotype[1]  = first + Offset;
        withGenotype = true; 
    }
    else if (first_ratio > 0.3 && second_ratio >= first_ratio * 0.66) {
        genotype[0] = first + Offset; 
        genotype[1] = second + Offset; 
        withGenotype = true; 
    }

    return;
} 

// release memory
void HomoSite::ReleaseMemory() {
    for (unsigned int k=0; k<polyscan.totalBamPairsNum; k++) {
        delete [] normalDis[k];
        delete []  tumorDis[k]; 
    }
    delete [] normalDis;
    delete [] tumorDis;
}