/*
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    VALIDATE INPUTS
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*/

def summary_params = NfcoreSchema.paramsSummaryMap(workflow, params)

// Validate input parameters
WorkflowTaxprofiler.initialise(params, log)

// TODO nf-core: Add all file path parameters for the pipeline to the list below
// Check input path parameters to see if they exist
def checkPathParamList = [ params.input, params.databases, params.shortread_hostremoval_reference,
                            params.shortread_hostremoval_index, params.multiqc_config
                        ]
for (param in checkPathParamList) { if (param) { file(param, checkIfExists: true) } }

// Check mandatory parameters
if (params.input    ) { ch_input     = file(params.input)     } else { exit 1, 'Input samplesheet not specified!' }
if (params.databases) { ch_databases = file(params.databases) } else { exit 1, 'Input database sheet not specified!' }
if (params.shortread_clipmerge_mergepairs && params.run_malt ) log.warn "[nf-core/taxprofiler] warning: MALT does not accept uncollapsed paired-reads. Pairs will be profiled as separate files."
if (params.shortread_clipmerge_excludeunmerged && !params.shortread_clipmerge_mergepairs) exit 1, "[nf-core/taxprofiler] error: cannot include unmerged reads when merging not turned on. Please specify --shortread_clipmerge_mergepairs"

if (params.perform_shortread_hostremoval && !params.shortread_hostremoval_reference) { exit 1, "[nf-core/taxprofiler] error: --shortread_hostremoval requested but no --shortread_hostremoval_reference FASTA supplied. Check input." }
if (!params.shortread_hostremoval_reference && params.shortread_hostremoval_reference_index) { exit 1, "[nf-core/taxprofiler] error: --shortread_hostremoval_index provided but no --shortread_hostremoval_reference FASTA supplied. Check input." }

if (params.shortread_hostremoval_reference ) { ch_reference       = file(params.shortread_hostremoval_reference) }
if (params.shortread_hostremoval_index     ) { ch_reference_index = file(params.shortread_hostremoval_index    ) } else { ch_reference_index = [] }

/*
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    CONFIG FILES
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*/

ch_multiqc_config        = file("$projectDir/assets/multiqc_config.yml", checkIfExists: true)
ch_multiqc_custom_config = params.multiqc_config ? Channel.fromPath(params.multiqc_config) : Channel.empty()

/*
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    IMPORT LOCAL MODULES/SUBWORKFLOWS
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*/

//
// SUBWORKFLOW: Consisting of a mix of local and nf-core/modules
//
include { INPUT_CHECK             } from '../subworkflows/local/input_check'

include { DB_CHECK                      } from '../subworkflows/local/db_check'
include { SHORTREAD_PREPROCESSING       } from '../subworkflows/local/shortread_preprocessing'
include { LONGREAD_PREPROCESSING        } from '../subworkflows/local/longread_preprocessing'
include { SHORTREAD_HOSTREMOVAL         } from '../subworkflows/local/shortread_hostremoval'
include { SHORTREAD_COMPLEXITYFILTERING } from '../subworkflows/local/shortread_complexityfiltering'
include { PROFILING                     } from '../subworkflows/local/profiling'

/*
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    IMPORT NF-CORE MODULES/SUBWORKFLOWS
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*/

//
// MODULE: Installed directly from nf-core/modules
//
include { FASTQC                      } from '../modules/nf-core/modules/fastqc/main'
include { MULTIQC                     } from '../modules/nf-core/modules/multiqc/main'
include { CUSTOM_DUMPSOFTWAREVERSIONS } from '../modules/nf-core/modules/custom/dumpsoftwareversions/main'

include { CAT_FASTQ                   } from '../modules/nf-core/modules/cat/fastq/main'

/*
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    RUN MAIN WORKFLOW
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*/

// Info required for completion email and summary
def multiqc_report = []

workflow TAXPROFILER {

    ch_versions = Channel.empty()

    /*
        SUBWORKFLOW: Read in samplesheet, validate and stage input files
    */
    INPUT_CHECK (
        ch_input
    )
    ch_versions = ch_versions.mix(INPUT_CHECK.out.versions)

    DB_CHECK (
        ch_databases
    )
    ch_versions = ch_versions.mix(DB_CHECK.out.versions)

    /*
        MODULE: Run FastQC
    */
    ch_input_for_fastqc = INPUT_CHECK.out.fastq.mix( INPUT_CHECK.out.nanopore )

    FASTQC (
        ch_input_for_fastqc
    )

    ch_versions = ch_versions.mix(FASTQC.out.versions.first())

    /*
        SUBWORKFLOW: PERFORM PREPROCESSING
    */
    if ( params.perform_shortread_clipmerge ) {

        ch_shortreads_preprocessed = SHORTREAD_PREPROCESSING ( INPUT_CHECK.out.fastq ).reads
    } else {
        ch_shortreads_preprocessed = INPUT_CHECK.out.fastq
    }

    if ( params.perform_longread_clip ) {
        ch_longreads_preprocessed = LONGREAD_PREPROCESSING ( INPUT_CHECK.out.nanopore ).reads
                                        .map { it -> [ it[0], [it[1]] ] }
        ch_versions = ch_versions.mix(LONGREAD_PREPROCESSING.out.versions.first())
    } else {
        ch_longreads_preprocessed = INPUT_CHECK.out.nanopore
    }

    /*
        SUBWORKFLOW: COMPLEXITY FILTERING
    */

    if ( params.perform_shortread_complexityfilter ) {
        ch_shortreads_filtered = SHORTREAD_COMPLEXITYFILTERING ( ch_shortreads_preprocessed ).reads
    } else {
        ch_shortreads_filtered = ch_shortreads_preprocessed
    }

    /*
        SUBWORKFLOW: HOST REMOVAL
    */

    if ( params.perform_shortread_hostremoval ) {
        ch_shortreads_hostremoved = SHORTREAD_HOSTREMOVAL ( ch_shortreads_filtered, ch_reference, ch_reference_index ).reads
        ch_versions = ch_versions.mix(SHORTREAD_HOSTREMOVAL.out.versions.first())
    } else {
        ch_shortreads_hostremoved = ch_shortreads_filtered
    }

    if ( params.perform_runmerging ) {

        ch_reads_for_cat_branch = ch_shortreads_hostremoved
            .mix( ch_longreads_preprocessed )
            .map {
                meta, reads ->
                    def meta_new = meta.clone()
                    meta_new.remove('run_accession')
                    [ meta_new, reads ]
            }
            .groupTuple()
            .map {
                meta, reads ->
                    [ meta, reads.flatten() ]
            }
            .branch {
                meta, reads ->
                // we can't concatenate files if there is not a second run, we branch
                // here to separate them out, and mix back in after for efficiency
                cat: ( meta.single_end && reads.size() > 1 ) || ( !meta.single_end && reads.size() > 2 )
                skip: true
            }

        ch_reads_runmerged = CAT_FASTQ ( ch_reads_for_cat_branch.cat ).reads
            .mix( ch_reads_for_cat_branch.skip )
            .map {
                meta, reads ->
                [ meta, [ reads ].flatten() ]
            }

    } else {
        ch_reads_runmerged = ch_shortreads_hostremoved
            .mix( ch_longreads_preprocessed )
    }

    /*
        SUBWORKFLOW: PROFILING
    */

    PROFILING ( ch_reads_runmerged, DB_CHECK.out.dbs )
    ch_versions = ch_versions.mix( PROFILING.out.versions )

    /*
        MODULE: MultiQC
    */

    CUSTOM_DUMPSOFTWAREVERSIONS (
        ch_versions.unique().collectFile(name: 'collated_versions.yml')
    )


    workflow_summary    = WorkflowTaxprofiler.paramsSummaryMultiqc(workflow, summary_params)
    ch_workflow_summary = Channel.value(workflow_summary)

    ch_multiqc_files = Channel.empty()
    ch_multiqc_files = ch_multiqc_files.mix(Channel.from(ch_multiqc_config))
    ch_multiqc_files = ch_multiqc_files.mix(ch_multiqc_custom_config.collect().ifEmpty([]))
    ch_multiqc_files = ch_multiqc_files.mix(ch_workflow_summary.collectFile(name: 'workflow_summary_mqc.yaml'))
    ch_multiqc_files = ch_multiqc_files.mix(CUSTOM_DUMPSOFTWAREVERSIONS.out.mqc_yml.collect())
    ch_multiqc_files = ch_multiqc_files.mix(FASTQC.out.zip.collect{it[1]}.ifEmpty([]))

    if (params.perform_shortread_clipmerge) {
        ch_multiqc_files = ch_multiqc_files.mix( SHORTREAD_PREPROCESSING.out.mqc.collect{it[1]}.ifEmpty([]) )
        ch_versions = ch_versions.mix( SHORTREAD_PREPROCESSING.out.versions )
    }

    if (params.perform_longread_clip) {
        ch_multiqc_files = ch_multiqc_files.mix( LONGREAD_PREPROCESSING.out.mqc.collect{it[1]}.ifEmpty([]) )
        ch_versions = ch_versions.mix( LONGREAD_PREPROCESSING.out.versions )
    }

    if (params.perform_shortread_complexityfilter){
        ch_multiqc_files = ch_multiqc_files.mix( SHORTREAD_COMPLEXITYFILTERING.out.mqc.collect{it[1]}.ifEmpty([]) )
        ch_versions = ch_versions.mix( SHORTREAD_COMPLEXITYFILTERING.out.versions )
    }

    if (params.perform_shortread_hostremoval) {
        ch_multiqc_files = ch_multiqc_files.mix(SHORTREAD_HOSTREMOVAL.out.mqc.collect{it[1]}.ifEmpty([]))
        ch_versions = ch_versions.mix(SHORTREAD_HOSTREMOVAL.out.versions)
    }

    if (params.perform_runmerging){
        ch_versions = ch_versions.mix(CAT_FASTQ.out.versions)
    }

    ch_multiqc_files = ch_multiqc_files.mix( PROFILING.out.mqc )

    // TODO create multiQC module for metaphlan
    MULTIQC (
        ch_multiqc_files.collect()
    )
    multiqc_report = MULTIQC.out.report.toList()
    ch_versions    = ch_versions.mix(MULTIQC.out.versions)
}

/*
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    COMPLETION EMAIL AND SUMMARY
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*/

workflow.onComplete {
    if (params.email || params.email_on_fail) {
        NfcoreTemplate.email(workflow, params, summary_params, projectDir, log, multiqc_report)
    }
    NfcoreTemplate.summary(workflow, params, log)
}

/*
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    THE END
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*/