#!/usr/bin/env python

"""
 Copyright 2014, Ben Langmead <langmea@cs.jhu.edu>

 This file is part of Bowtie.

 Bowtie is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation, either version 3 of the License, or
 (at your option) any later version.

 Bowtie is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License
 along with Bowtie.  If not, see <http://www.gnu.org/licenses/>.
"""

import os
import sys
import logging
import argparse

def main():
    for i, arg in enumerate(sys.argv[1:]):
        if arg.startswith('-'):
            continue
        if arg.lower().endswith(('.bz', '.bz2')):
            basename, ext = os.path.splitext(arg.lower())
            out_file = open(basename, 'wb')
            import bz2
            out_file.write(bz2.BZ2File(arg).read())
            out_file.close()
            sys.argv[i+1] = basename

    parser = argparse.ArgumentParser()

    group = parser.add_mutually_exclusive_group()
    group.add_argument('-b', '--build', action='store_true')
    group.add_argument('-i', '--inspect', action='store_true')

    parser.add_argument('--verbose', action='store_true')
    parser.add_argument('--debug', action='store_true')
    parser.add_argument('--large-index', action='store_true')
    parser.add_argument('--index', type=str)

    # parse the args specific to the wrapper script
    # all other args will be passed verbatim to bowtie
    args, bowtie_args = parser.parse_known_args()

    action = 'align'
    if args.inspect:
        action = 'inspect'
    elif args.build:
        action = 'build'

    logging.basicConfig(level=logging.ERROR,
                        format='%(levelname)s: %(message)s'
                        )
    bin_name            = 'bowtie' + '-' + action
    bin_s               = 'bowtie-%s-s' % action
    bin_l               = 'bowtie-%s-l' % action
    idx_ext_l           = '.1.ebwtl'
    idx_ext_s           = '.1.ebwt'
    ex_path             = os.path.dirname(os.path.realpath(__file__))
    bin_spec            = os.path.join(ex_path, bin_s)

    if args.verbose:
        bowtie_args.append('--verbose')
        logging.getLogger().setLevel(logging.INFO)

    if args.large_index:
        bin_spec = os.path.join(ex_path, bin_l)

    if args.index:
        if args.build:
            delta = 200
            small_index_max_size = 4 * 1024 ** 3 - delta
            tot_size = sum([os.stat(fn).st_size
                            for fn in args.index.split(',')
                            if os.path.exists(fn)])

            if tot_size > small_index_max_size:
                bin_spec = os.path.join(ex_path, bin_l)
        else:
            if not os.path.exists(arg + idx_ext_s)\
                    and os.path.exists(args.index + idx_ext_l):
                bin_spec = os.path.join(ex_path, bin_l)
        bowtie_args.insert(0, args.index)
    else:
        for arg in bowtie_args:
            if arg[0] == '-':
                continue
            if not os.path.exists(arg + idx_ext_s)\
                    and os.path.exists(arg + idx_ext_l):
                bin_spec = os.path.join(ex_path, bin_l)

    if args.debug:
        bin_spec += '-debug'

    bowtie_args.insert(0, bin_spec)
    bowtie_args.insert(1, 'basic-0')
    bowtie_args.insert(1, '--wrapper')

    logging.info('Command: %s %s' %  (bin_spec,' '.join(bowtie_args[1:])))
    os.execv(bin_spec, bowtie_args)

if __name__ == "__main__":
    main()
