#! /usr/bin/env python
import sys, os, gzip
from optparse import OptionParser

parser = OptionParser( usage='%prog [options] source destination', 
  version='%prog 1.0',
  description = 'Copy the structure of BrainVISA databases.' )
#parser.add_option( '-v', '--variable',
                   #action='append', type='string', dest='variables', default=[],
                   #help = 'Adds a path environment variable. If none is given, PATH, LD_LIBRARY_PATH and PYTHONPATH are used. ' )
options, args = parser.parse_args()
if len( args ) != 2:
  parser.error( 'Invalid arguments. Try "' + sys.argv[ 0 ] + ' --help" to get some help.' )

def copyStructure( source, destination ):
  if os.path.isdir( source ):
    # Create a directory
    os.mkdir( destination )
    for child in os.listdir( source ):
      copyStructure( os.path.join( source, child ), os.path.join( destination, child ) )
  else:
    # Create an empty file
    open( destination, 'w' ).close()

def copyStructureToFile( source, file ):
  for child in os.listdir( source ):
    fullPath = os.path.join( source, child )
    if os.path.isdir( fullPath ):
      # Create a directory
      file.write('d'+child+'\n')
      copyStructureToFile( fullPath, file )
    elif child.endswith( '.minf' ) or child.endswith( '.referential' ):
      file.write('m'+child+'\t'+repr(open(fullPath,'rb').read())+'\n')
    else:
      # Create an empty file
      file.write('f'+child+'\n')
  file.write('\n')

def copyStructureFromFile( file, destination ):
  c = file.read(1)
  while True:
    if c == 'f':
      name = file.readline()[:-1]
      try:
        open( os.path.join( destination, name ), 'w' ).close() 
      except Exception, e:
        print >> sys.stderr, e
    elif c == 'd':
      directory = os.path.join( destination, file.readline()[:-1] )
      os.mkdir( directory )
      copyStructureFromFile( file, directory )
    elif c == 'm':
      l = file.readline()[:-1].split( '\t' )
      name, content = l
      content = eval( content )
      try:
        open( os.path.join( destination, name ), 'wb' ).write( content )
      except Exception, e:
        print >> sys.stderr, e
    else:
      break
    c = file.read(1)
   
source, destination = args
if os.path.isdir( source ):
  file = gzip.open( destination, 'w' )
  copyStructureToFile( source, file )
else:
  file = gzip.open( source, 'r' )
  os.mkdir( destination )
  copyStructureFromFile( file, destination )