process METAPHLAN3 {
    tag "$meta.id"
    label 'process_high'

    conda (params.enable_conda ? 'bioconda::metaphlan=3.0.12' : null)
    container "${ workflow.containerEngine == 'singularity' && !task.ext.singularity_pull_docker_container ?
        'https://depot.galaxyproject.org/singularity/metaphlan:3.0.12--pyhb7b1952_0' :
        'quay.io/biocontainers/metaphlan:3.0.12--pyhb7b1952_0' }"

    input:
    tuple val(meta), path(input)
    path metaphlan_db

    output:
    tuple val(meta), path("*_profile.txt")   ,                emit: profile
    tuple val(meta), path("*.biom")          ,                emit: biom
    tuple val(meta), path('*.bowtie2out.txt'), optional:true, emit: bt2out
    path "versions.yml"                      ,                emit: versions

    when:
    task.ext.when == null || task.ext.when

    script:
    def args = task.ext.args ?: ''
    def prefix = task.ext.prefix ?: "${meta.id}"
    def input_type  = ("$input".endsWith(".fastq.gz")) ? "--input_type fastq" :  ("$input".contains(".fasta")) ? "--input_type fasta" : ("$input".endsWith(".bowtie2out.txt")) ? "--input_type bowtie2out" : "--input_type sam"
    def input_data  = ("$input_type".contains("fastq")) && !meta.single_end ? "${input[0]},${input[1]}" : "$input"
    def bowtie2_out = "$input_type" == "--input_type bowtie2out" || "$input_type" == "--input_type sam" ? '' : "--bowtie2out ${prefix}.bowtie2out.txt"

    """
    metaphlan \\
        --nproc $task.cpus \\
        $input_type \\
        $input_data \\
        $args \\
        $bowtie2_out \\
        --bowtie2db ${metaphlan_db} \\
        --biom ${prefix}.biom \\
        --output_file ${prefix}_profile.txt
    cat <<-END_VERSIONS > versions.yml
    "${task.process}":
        metaphlan3: \$(metaphlan --version 2>&1 | awk '{print \$3}')
    END_VERSIONS
    """
}