process FILTER_STATS {
    label 'process_medium'

    conda (params.enable_conda ? 'bowtie2=2.4.5' : null)
    container "${ workflow.containerEngine == 'singularity' && !task.ext.singularity_pull_docker_container ?
        'https://depot.galaxyproject.org/singularity/bowtie2:2.4.5--py39hd2f7db1_2' :
        'quay.io/biocontainers/bowtie2:2.4.5--py36hfca12d5_2' }"

    input:
    tuple val(meta), path(reads)
    path stats_files

    output:
    path "*_mqc.yaml"                           , emit: stats
    tuple val(meta), path('*.filtered.fastq.gz'), emit: reads

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

    script:
    """
    readnumber=\$(wc -l ${reads} | awk '{ print \$1/4 }')
    cat ./filtered.${meta.id}_*.stats | \\
    tr '\n' ', ' | \\
    awk -v sample=${meta.id} -v readnumber=\$readnumber '{ print "id: \\"my_pca_section\\"\\nsection_name: \\"Contamination Filtering\\"\\ndescription: \\"This plot shows the amount of reads filtered by contaminant type.\\"\\nplot_type: \\"bargraph\\"\\npconfig:\\n  id: \\"contamination_filter_plot\\"\\n  title: \\"Contamination Plot\\"\\n  ylab: \\"Number of reads\\"\\ndata:\\n    "sample": {"\$0"\\"remaining reads\\": "readnumber"}" }' > ${meta.id}.contamination_mqc.yaml
    gzip -c ${reads} > ${meta.id}.filtered.fastq.gz
    """
}
