/*
* Copyright 2012-2015 Broad Institute, Inc.
* 
* 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,
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* THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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package org.broadinstitute.gatk.tools.walkers.qc;

import org.broadinstitute.gatk.engine.CommandLineGATK;
import org.broadinstitute.gatk.utils.contexts.ReferenceContext;
import org.broadinstitute.gatk.utils.refdata.RefMetaDataTracker;
import org.broadinstitute.gatk.engine.walkers.DataSource;
import org.broadinstitute.gatk.engine.walkers.ReadWalker;
import org.broadinstitute.gatk.engine.walkers.Requires;
import org.broadinstitute.gatk.utils.help.DocumentedGATKFeature;
import org.broadinstitute.gatk.utils.help.HelpConstants;
import org.broadinstitute.gatk.utils.sam.GATKSAMRecord;

/**
 * Count the number of bases in a set of reads
 *
 * <h3>Input</h3>
 * <p>
 * One or more BAM files.
 * </p>
 *
 * <h3>Output</h3>
 * <p>
 * Number of bases seen. If an output file name is provided, then the result will be written to that file.
 * Otherwise it will be sent to standard console output.
 * </p>
 *
 * <h3>Usage example</h3>
 * <pre>
 * java -jar GenomeAnalysisTK.jar \
 *   -R reference.fasta \
 *   -T CountBases \
 *   -I input.bam \
 *   [-L input.intervals]
 * </pre>
 *
 */
@DocumentedGATKFeature( groupName = HelpConstants.DOCS_CAT_QC, extraDocs = {CommandLineGATK.class} )
@Requires({DataSource.READS, DataSource.REFERENCE})
public class CountBases extends ReadWalker<Integer, Long> {
    public Integer map(ReferenceContext ref, GATKSAMRecord read, RefMetaDataTracker tracker) {

        return read.getReadLength();
    }

    public Long reduceInit() { return 0L; }

    public Long reduce(Integer value, Long sum) {
        return (long) value + sum;
    }
}
