/*
 * The MIT License
 *
 * Copyright (c) 2009 The Broad Institute
 *
 * 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.
 */

package net.sf.picard.analysis.directed;

import net.sf.picard.analysis.MetricAccumulationLevel;
import net.sf.picard.reference.ReferenceSequenceFile;
import net.sf.picard.sam.DuplicationMetrics;
import net.sf.samtools.*;

import java.io.File;
import java.util.*;

/**
 * Calculates HS metrics for a given SAM or BAM file. Requires the input of a list of
 * target intervals and a list of bait intervals. Can be invoked either on an entire
 * iterator of SAMRecords or be passed SAMRecords one at a time.
 *
 * @author Jonathan Burke
 */
public class HsMetricCollector extends TargetMetricsCollector<HsMetrics> {

    public HsMetricCollector(final Set<MetricAccumulationLevel> accumulationLevels, final List<SAMReadGroupRecord> samRgRecords, final ReferenceSequenceFile refFile, final File perTargetCoverage, final File targetIntervals, final File probeIntervals, final String probeSetName) {
        super(accumulationLevels, samRgRecords, refFile, perTargetCoverage, targetIntervals, probeIntervals, probeSetName);
    }

    @Override
    public HsMetrics convertMetric(TargetMetrics targetMetrics) {
        final HsMetrics hsMetrics = new HsMetrics();
        TargetMetricsCollector.reflectiveCopy(targetMetrics, hsMetrics,
                new String[]{"PROBE_SET", "PROBE_TERRITORY", "ON_PROBE_BASES", "NEAR_PROBE_BASES", "OFF_PROBE_BASES", "PCT_OFF_PROBE", "ON_PROBE_VS_SELECTED", "MEAN_PROBE_COVERAGE"},
                new String[]{"BAIT_SET",  "BAIT_TERRITORY",  "ON_BAIT_BASES",  "NEAR_BAIT_BASES",  "OFF_BAIT_BASES",  "PCT_OFF_BAIT",  "ON_BAIT_VS_SELECTED",  "MEAN_BAIT_COVERAGE"}
        );

        hsMetrics.BAIT_DESIGN_EFFICIENCY = (double) hsMetrics.TARGET_TERRITORY / (double) hsMetrics.BAIT_TERRITORY;
        hsMetrics.PCT_USABLE_BASES_ON_BAIT   = hsMetrics.ON_BAIT_BASES   / (double) targetMetrics.PF_BASES;
        hsMetrics.PCT_USABLE_BASES_ON_TARGET = hsMetrics.ON_TARGET_BASES / (double) targetMetrics.PF_BASES;
        hsMetrics.HS_LIBRARY_SIZE = DuplicationMetrics.estimateLibrarySize(targetMetrics.PF_SELECTED_PAIRS, targetMetrics.PF_SELECTED_UNIQUE_PAIRS);

        //need HSLIBRARY_SIZE
        hsMetrics.HS_PENALTY_10X = calculateHsPenalty(hsMetrics.HS_LIBRARY_SIZE, targetMetrics, 10);
        hsMetrics.HS_PENALTY_20X = calculateHsPenalty(hsMetrics.HS_LIBRARY_SIZE, targetMetrics, 20);
        hsMetrics.HS_PENALTY_30X = calculateHsPenalty(hsMetrics.HS_LIBRARY_SIZE, targetMetrics, 30);
        return hsMetrics;
    }

    /**
     * Attempts to calculate the HS penalty incurred by the library in order to get 80%
     * of target bases (in non-zero-covered targets) to a specific target coverage (e.g. 20X).
     *
     * @param coverageGoal the desired coverage target (e.g. 20X)
     * @return the hs penalty - a multiplier that tells if you want, e.g. 20X coverage, then you will
     *         need to produce this many PF aligned bases per target bases in your design!
     */
    private double calculateHsPenalty(final Long librarySize, final TargetMetrics targetMetrics, final int coverageGoal) {
        if (librarySize == null) return 0;

        final double meanCoverage  = targetMetrics.ON_TARGET_FROM_PAIR_BASES / (double) targetMetrics.TARGET_TERRITORY;
        final double fold80        = targetMetrics.FOLD_80_BASE_PENALTY;
        final long pairs           = targetMetrics.PF_SELECTED_PAIRS;
        final long uniquePairs     = targetMetrics.PF_SELECTED_UNIQUE_PAIRS;
        final double onTargetPct   = (double) targetMetrics.ON_TARGET_BASES / (double) targetMetrics.PF_UQ_BASES_ALIGNED;

        final double uniquePairGoalMultiplier = (coverageGoal / meanCoverage) * fold80;
        double pairMultiplier = uniquePairGoalMultiplier;
        double increment = 1;
        boolean goingUp = uniquePairGoalMultiplier >= 1;
        double finalPairMultiplier = -1;

        // Converge "pairMultiplier" to the number that gives us a uniquePairMultiplier equal
        // to the coverage multiplier we desire.  If we can't get there with 1000X coverage,
        // we're not going to get there!
        for (int i=0; i<10000; ++i) {
            final double uniquePairMultiplier = DuplicationMetrics.estimateRoi(librarySize, pairMultiplier, pairs, uniquePairs);

            if (Math.abs(uniquePairMultiplier - uniquePairGoalMultiplier) / uniquePairGoalMultiplier <= 0.001) {
                finalPairMultiplier  = pairMultiplier;
                break;
            }
            else if ((uniquePairMultiplier > uniquePairGoalMultiplier && goingUp) ||
                    (uniquePairMultiplier < uniquePairGoalMultiplier && !goingUp)){
                increment /= 2;
                goingUp = !goingUp;
            }

            pairMultiplier += (goingUp ? increment : -increment);
        }

        if (finalPairMultiplier == -1) {
            return -1;
        }
        else {
            final double uniqueFraction = (uniquePairs * uniquePairGoalMultiplier) / (pairs * finalPairMultiplier);
            return (1 / uniqueFraction) * fold80 * (1 / onTargetPct);
        }
    }

}