<tool id="ivar_variants" name="ivar variants" version="@VERSION@+galaxy1">
    <description>Call variants from aligned BAM file</description>
    <macros>
        <import>macros.xml</import>
    </macros>
    <expand macro="requirements">
        <requirement type="package" version="3">python</requirement>
    </expand>
    <expand macro="version_command" />
    <command detect_errors="exit_code"><![CDATA[
        ln -s '$ref' ref.fa &&
        ln -s '$input_bam' sorted.bam &&
        samtools mpileup -A -d 0 --reference ref.fa -B -Q 0 sorted.bam | ivar variants 
        -p variants
        -q $min_qual
        -t $min_freq &&
        #if str($output_format.choice) == 'vcf'
            python '${__tool_directory__}/ivar_variants_to_vcf.py' 
            ${output_format.pass_only}
            variants.tsv '$output_variants'
        #else
            cp variants.tsv '$output_variants'
        #end if
    ]]>    </command>
    <inputs>
        <param name="input_bam" type="data" format="bam" label="Bam file" help="Aligned reads, to trim primers and quality"/>
        <param name="ref" type="data" format="fasta" label="Reference"/>
        <param name="min_qual" argument="-q" type="integer" min="1" value="20" label="Minimum quality score threshold to count base"/>
        <param name="min_freq" argument="-t" type="float" min="0" max="1" value="0.03" label="Minimum frequency threshold"/>
        <conditional name="output_format">
            <param name="choice" type="select" label="Output format">
                <option value="tabular">Tabular (native tool output)</option>
                <option value="vcf">VCF</option>
            </param>
            <when value="vcf">
                <param argument="--pass_only" type="boolean" truevalue="--pass_only" falsevalue="" label="In VCF only output variants that PASS all filters" />
            </when>
            <when value="tabular" />
        </conditional>    
    </inputs>
    <outputs>
        <data name="output_variants" format="tabular" label="${tool.name} on ${on_string}">
            <change_format>
                <when input="output_format.choice" value="vcf" format="vcf" />
            </change_format>
        </data>
    </outputs>
    <tests>
        <test expect_num_outputs="1">
            <param name="input_bam" value="zika/Z52_a.masked.sorted.bam" />
            <param name="ref" value="zika/db/PRV.fa" />
            <output name="output_variants" file="zika/Z52_a.tsv" ftype="tabular" lines_diff="10"/>
        </test>
        <test expect_num_outputs="1">
            <param name="input_bam" value="zika/Z52_a.masked.sorted.bam" />
            <param name="ref" value="zika/db/PRV.fa" />
            <conditional name="output_format">
                <param name="choice" value="vcf" />
            </conditional>
            <output name="output_variants" file="zika/Z52_a.vcf" ftype="vcf"/>
        </test>
    </tests>
    <help><![CDATA[
        iVar uses the output of the samtools mpileup command to call variants -
        single nucleotide variants(SNVs) and indels. In order to call variants
        correctly, the reference file used for alignment must be passed to iVar
        using the -r flag. The output of samtools pileup is piped into ivar variants
        to generate a .tsv file with the variants. There are two parameters that can
        be set for variant calling using iVar - minimum quality(Default: 20) and
        minimum frequency(Default: 0.03). Minimum quality is the minimum quality for
        a base to be counted towards the ungapped depth to canculate iSNV frequency
        at a given position. For insertions, the quality metric is discarded and the
        mpileup depth is used directly. Minimum frequency is the minimum frequency
        required for a SNV or indel to be reported.
        
        Documentation can be found at `<https://andersen-lab.github.io/ivar/html/manualpage.html>`_.

        Optionally output is converted to VCF using a version of the `ivar_variants_to_vcf.py script <https://github.com/nf-core/viralrecon/blob/dev/bin/ivar_variants_to_vcf.py>`_,
        that has been modified to store attributes in INFO fields.
    ]]>    </help>
    <expand macro="citations">
        <citation type="bibtex">@misc{githubivar_variants_to_vcf,
            author = {Fernandez, Sarai Varona and Patel, Harshil},
            year = {2021},
            title = {ivar_variants_to_vcf},
            url = {https://github.com/nf-core/viralrecon/blob/dev/bin/ivar_variants_to_vcf.py}
        }</citation>    </expand>
</tool>