#!/usr/bin/env python
# ----------------------------------------------------------------------
#  grabdata
#
#  script to grab dx files from a run.xml file
#
#  RUN AS FOLLOWS:
#    grabdata [-h|-t] <runFile>
#
#      -h | --help    - print the help menu
#      -t | --type    - type of data to grab
#
#      <runFile>      - the run.xml file containing dx files
#
# ======================================================================
#  AUTHOR:  Derrick Kearney, Purdue University
#  Copyright (c) 2004-2012  HUBzero Foundation, LLC
#
#  See the file "license.terms" for information on usage and
#  redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES.
# ======================================================================
#
#

import re
import os
import sys
import getopt
import Rappture

def help(argv=sys.argv):
    return """%(prog)s [-h|-t] runFile
      Grab DX, PDB, or other files from a run.xml file

      -h | --help    - print the help menu
      -t | --type    - type of data to grab

      <runFile>      - the run.xml file containing dx, pdb or other files

      Examples:
        %(prog)s run1234.xml
        %(prog)s -t dx run1234.xml
        %(prog)s -t pdb run1234.xml
""" % {'prog':os.path.basename(argv[0])}

def main(argv=None):

    if argv is None:
        argv = sys.argv

    if len(argv) < 2:
        msg = "%(prog)s requires at least 1 arguments" % {'prog':argv[0]}
        print >>sys.stderr, msg
        print >>sys.stderr, help()
        return 2

    longOpts = ["type=","help"]
    shortOpts = "t:h"
    try:
        opts, args = getopt.getopt(argv[1:], shortOpts, longOpts)
    except getopt.GetoptError, msg:
        print >>sys.stderr, msg
        print >>sys.stderr, help()
        return 2

    tag = 'dx'

    # match options
    for o, v in opts:
        if o in ("-t", "--type"):
            tag = v
        elif o in ("-h", "--help"):
            print >>sys.stderr, help()
            return 2

    runFile = args[0]

    # look for the text <tag> (any characters non-greedy) </tag>
    regexp = r'<%(tag)s>(?P<data>.*?)</%(tag)s>' % {'tag':tag}
    re_command = re.compile(regexp,re.I|re.DOTALL)

    try:
        xmlfile = open(runFile, "rb").read()
    except IOError, msg:
        print >>sys.stderr, msg
        return 2

    cnt = 0
    runFileBase = os.path.basename(runFile)
    prefix,ext = os.path.splitext(runFileBase)

    outTextIter = re_command.finditer(xmlfile)
    for match in outTextIter:
        if match:
            encoded_data = match.group('data')
            # This needs to be a python static variable:
            # RPENC_HDR == 4
            unencoded_data = Rappture.encoding.decode(encoded_data,4)
            newDXFile = open('%s_%i_.%s'%(prefix,cnt,tag),'wb')
            newDXFile.write(unencoded_data)
            newDXFile.close()
            cnt += 1

if __name__ == '__main__' :
    # call main and exit gracefully
    sys.exit(main())