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#!/usr/bin/python

"""Utility for converting variant GFF3 files to 1000 Genomes VCF"""

import sys
import os
import time
import json
import logging
import argparse
import traceback

from pbcommand.models import FileTypes, get_pbparser
from pbcommand.cli import pbparser_runner
from pbcommand.utils import setup_log
from pbcore.io import GffReader, WriterBase

#
# (Ported from pbpy)
#

__version__ = "3.0"

log = logging.getLogger(__name__)


class Constants(object):
    TASK_ID = "genomic_consensus.tasks.gff2vcf"
    DRIVER_EXE = "gffToVcf --resolved-tool-contract "
    GLOBAL_REFERENCE_ID = "genomic_consensus.task_options.global_reference"

class VcfRecord:
    """Models a record in a VCF3.3 file."""
    def __init__(self):
        self.chrom = ''
        self.pos = 1
        self.id = '.'
        self.ref = ''
        self.alt = ''
        self.qual = -1.00
        self.filter = '0'
        self.info = {}

    @staticmethod
    def fromVariantGffRecord(gff):
        vcf = VcfRecord()
        vcf.chrom = gff.seqid
        vcf.id = '.'

        ref = gff.reference
        if ref is None:
            vcf.ref = "N"
        else:
            vcf.ref = ref
        vcf.qual = float(gff.confidence)
        vcf.put('NS', 1)
        vcf.put('DP', gff.coverage)

        feature = gff.type
        vcf.pos = gff.start
        if feature == 'insertion':
            vcf.alt = 'I%s' % gff.variantSeq.upper()
        elif feature == 'deletion':
            vcf.alt = 'D%s' % len(gff.reference)
        elif feature == 'substitution':
            vcf.alt = gff.variantSeq.upper()
        else:
            print >> sys.stderr, 'Unsupported feature %s found in GFF3 file.' % feature

        return vcf

    def put(self, key, value):
        self.info[key] = value

    @staticmethod
    def getHeader():
        return 'CHROM\tPOS\tID\tREF\tALT\tQUAL\tFILTER\tINFO'

    def _getInfoString(self):
        return ';'.join(['%s=%s' % (k,v) \
            for k,v in self.info.iteritems()])

    def __str__(self):
        return '%s\t%d\t%s\t%s\t%s\t%.2f\t%s\t%s' % \
            (self.chrom, self.pos, self.id, self.ref, \
              self.alt, self.qual, self.filter, self._getInfoString())

class VcfWriter(WriterBase):
    """Outputs VCF (1000 Genomes Variant Call Format) 3.3 files"""
    def __init__(self, outfile):
        self._outfile = outfile
        self._start()

    def close(self):
        self._outfile.close()

    def flush(self):
        self._outfile.flush()

    def _start(self):
        self.writeMetaData('fileformat', 'VCFv3.3')

    def writeHeader(self):
        print >> self._outfile, '#%s' % VcfRecord.getHeader()

    def writeMetaData(self, key, value):
        print >> self._outfile, '##%s=%s' % (key, value)

    def writeRecord( self, record ):
        print >> self._outfile, str(record)


class GffToVcf(object):
    """Utility for converting variant GFF3 files to 1000 Genomes VCF"""
    def __init__(self, gffFile, globalReference=None):
        self.gffFile = gffFile
        self.globalReference = globalReference

    def _writeMetaData(self, writer):
        currentTime = time.localtime()
        cmdLine = os.path.basename(sys.argv[0]) + ' ' + ' '.join(sys.argv[1:])

        writer.writeMetaData('fileDate', '%d%d%d' % \
                             (currentTime[0], currentTime[1], currentTime[2]))
        writer.writeMetaData('source', cmdLine)
        if self.globalReference is not None:
            writer.writeMetaData('reference', self.globalReference)
        writer.writeMetaData('INFO', 'NS,1,Integer,"Number of Samples with Data"')
        writer.writeMetaData('INFO', 'DP,1,Integer,"Total Depth of Coverage"')

        writer.writeHeader()

    def run(self, out=sys.stdout):
        with GffReader(self.gffFile) as reader, \
             VcfWriter(out) as writer:
            self._writeMetaData(writer)
            for gff in reader:
                vcf = VcfRecord.fromVariantGffRecord(gff)
                writer.writeRecord(vcf)
        return 0

def args_runner(args, out=sys.stdout):
    return GffToVcf(
        gffFile=args.gffFile,
        globalReference=args.globalReference).run(out=out)

def resolved_tool_contract_runner(resolved_tool_contract):
    rtc = resolved_tool_contract
    with open(rtc.task.output_files[0], "w") as f:
        gr = None #rtc.task.options[Constants.GLOBAL_REFERENCE_ID]
        return GffToVcf(
            gffFile=rtc.task.input_files[0],
            globalReference=gr).run(out=f)

def get_contract_parser():
    p = get_pbparser(
        tool_id=Constants.TASK_ID,
        version=__version__,
        name="gffToVcf",
        description=__doc__,
        driver_exe=Constants.DRIVER_EXE,
        default_level="ERROR")
    ap = p.arg_parser.parser
    tcp = p.tool_contract_parser
    p.add_input_file_type(FileTypes.GFF, "gffFile",
        "GFF file", "GFF file")
    tcp.add_output_file_type(FileTypes.VCF, "vcf", "VCF file", "VCF file",
        default_name="output")
    ap.add_argument("--globalReference", action="store", default=None,
        help="Name of global reference to put in Meta field")
    return p

def main(argv=sys.argv):
    return pbparser_runner(
        argv=argv[1:],
        parser=get_contract_parser(),
        args_runner_func=args_runner,
        contract_runner_func=resolved_tool_contract_runner,
        alog=log,
        setup_log_func=setup_log)

if __name__ == '__main__':
    sys.exit(main())