# -*- coding: utf-8 -*-
# Written 2007 by j@mailb.org

from threading import Event
import sha
from os import stat

from BitTornado.BT1.makemetafile import make_meta_file
from BitTornado.bencode import bencode, bdecode


def createTorrent(file, url, params = {}, flag = Event(),
                   progress = lambda x: None, progress_percent = 1):
  "Creates a torrent for a given file, using url as tracker url"
  return make_meta_file(file, url, params, flag, progress, progress_percent)

def getInfoHash(torrentFile):
  "Returns Torrent Info Hash from torrent file"
  metainfo_file = open(torrentFile, 'rb')
  metainfo = bdecode(metainfo_file.read())
  info = metainfo['info']
  return sha.sha(bencode(info)).hexdigest().upper()

def getTorrentInfoFromFile(torrentFile):
  f = open(torrentFile, 'rb')
  data = f.read()
  f.close()
  tinfo = getTorrentInfo(data)
  tinfo['timestamp'] = stat(torrentFile).st_ctime
  return tinfo

def getTorrentInfo(data):
  "Returns Torrent Info from torrent file"
  tinfo = {}
  metainfo = bdecode(data)
  info = metainfo['info']
  piece_length = info['piece length']
  if info.has_key('length'):
    # let's assume we just have one file
    file_length = info['length']
  else:
    # let's assume we have a directory structure
    file_length = 0;
    for file in info['files']:
      path = ''
      for item in file['path']:
        if (path != ''):
          path = path + "/"
        path = path + item
        file_length += file['length']
  for key in info:
    if key != 'pieces':
      tinfo[key] = info[key]
  for key in metainfo:
    if key != 'info':
      tinfo[key] = metainfo[key]
  tinfo['size'] = file_length
  tinfo['hash'] = sha.sha(bencode(info)).hexdigest()
  tinfo['announce'] = metainfo['announce']
  return tinfo

def getTorrentSize(torrentFile):
  "Returns Size of files in torrent file in bytes"
  return getTorrentInfo(torrentFile)['size']