#!/usr/bin/env python

# Copyright (C) 2016 Ian W. Harry, Alex Nitz
#
# This program 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.
#
# This program 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 this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

"""
Program for concatenating output files from pycbc_banksim split over bank
files. It is assumed that input files have analysed the same set of injections.
Concatenation of injections is done separately.
"""

from os.path import isfile
import argparse
import logging
from numpy import *
import pycbc
import pycbc.version

__author__  = "Ian Harry <ian.harry@astro.cf.ac.uk>"
__program__ = "pycbc_banksim_combine_banks"

# Read command line options
_desc = __doc__[1:]
parser = argparse.ArgumentParser(description=_desc)

parser.add_argument('--version', action=pycbc.version.Version)
parser.add_argument("--verbose", action="store_true", default=False,
                    help="verbose output")
parser.add_argument("-I", "--input-files", nargs='+',
                    help="Explicit list of input files.")
parser.add_argument("-o", "--output-file", required=True,
                    help="Output file name")

options = parser.parse_args()

dtypef={'names': ('match', 'bank', 'bank_i', 'sim', 'sim_i', 'sigmasq'),
        'formats': ('f8', 'S256', 'i4', 'S256', 'i4', 'f8')}

matches=[]
maxmatch = []
for fil in options.input_files:
    matches.append(loadtxt(fil, dtype=dtypef))

# It is possible for the input files to only contain a single injection
# if the user has split the injections many times.
if array(matches, dtype=dtypef)['match'].ndim == 1:
    index = array(matches, dtype=dtypef)['match'].argmax()
    maxmatch.append(matches[index])
else:
    indices = array(matches, dtype=dtypef)['match'].argmax(0)
    for i, j in enumerate(indices):
        maxmatch.append(matches[j][i])

maxmatch=array(maxmatch, dtype=dtypef)
savetxt(options.output_file, maxmatch, 
        fmt=('%5.5f', '%s', '%i', '%s', '%i', '%5.5f'), delimiter=' ')