#!/usr/local/bin/python

# The contents of this file are subject to the BitTorrent Open Source License
# Version 1.1 (the License).  You may not copy or use this file, in either
# source code or executable form, except in compliance with the License.  You
# may obtain a copy of the License at http://www.bittorrent.com/license/.
#
# Software distributed under the License is distributed on an AS IS basis,
# WITHOUT WARRANTY OF ANY KIND, either express or implied.  See the License
# for the specific language governing rights and limitations under the
# License.

# Written by Henry 'Pi' James, Loring Holden and Matt Chisholm

try:
  import psyco
  assert psyco.__version__ >= 0x010300f0
  psyco.full()
except:
  pass

from BitTorrent.translation import _

from sys import *
from os.path import *
from sha import *
from BitTorrent.bencode import *
from BitTorrent import version, app_name

NAME, EXT = splitext(basename(argv[0]))

print _("%s %s - decode %s metainfo files") % (NAME, version, app_name)
print 

if len(argv) == 1:
    print _("Usage: %s [TORRENTFILE [TORRENTFILE ... ] ]") % basename(argv[0])
    print
    exit(2) # common exit code for syntax error

labels = {'metafile'   : _("metainfo file: %s"       ),
          'infohash'   : _("info hash: %s"           ),
          'filename'   : _("file name: %s"           ),
          'filesize'   : _("file size:"              ),
          'files'      : _("files:"                  ),
          'dirname'    : _("directory name: %s"      ),
          'archive'    : _("archive size:"           ),
          'announce'   : _("tracker announce url: %s"),
          'announce-list'   : _("tracker announce list: %s"),
          'nodes'      : _("trackerless nodes:"      ),
          'comment'    : _("comment:"                ),
          }

maxlength = max( [len(v[:v.find(':')]) for v in labels.values()] )
# run through l10n-ed labels and make them all the same length
for k,v in labels.items():
    if ':' in v:
        index = v.index(':')
        newlabel = v.replace(':', '.'*(maxlength-index) + ':')
        labels[k] = newlabel

for metainfo_name in argv[1:]:
    metainfo_file = open(metainfo_name, 'rb')
    metainfo = bdecode(metainfo_file.read())
    metainfo_file.close()
    info = metainfo['info']
    info_hash = sha(bencode(info))

    print labels['metafile'] % basename(metainfo_name)
    print labels['infohash']  % info_hash.hexdigest()
    piece_length = info['piece length']
    if info.has_key('length'):
        # let's assume we just have a file
        print labels['filename'] % info['name']
        file_length = info['length']
        name = labels['filesize']
    else:
        # let's assume we have a directory structure
        print labels['dirname'] % info['name']
        print labels['files']
        file_length = 0;
        for file in info['files']:
            path = ''
            for item in file['path']:
                if (path != ''):
                   path = path + "/"
                path = path + item
            print '   %s (%d)' % (path, file['length'])
            file_length += file['length']
        name = labels['archive']
    piece_number, last_piece_length = divmod(file_length, piece_length)
    print '%s %i (%i * %i + %i)' \
          % (name,file_length, piece_number, piece_length, last_piece_length)

    if metainfo.has_key('announce'):
        print labels['announce'] % metainfo['announce']
    if 'announce-list' in metainfo:
        print labels['announce-list'] % metainfo['announce-list']
        
    if metainfo.has_key('nodes'):
        print labels['nodes']
        for n in metainfo['nodes']:
            print '\t%s\t:%d' % (n[0], n[1])
        
    print labels['comment']
    if metainfo.has_key('comment'):
        print metainfo['comment']
    print

