#!/usr/bin/env python

import os, sys, subprocess, locale, urllib2, gobject

import pygtk
pygtk.require('2.0')
import gtk

def download_chunk(base):
  # download 10kb a time
  chunk = base.dl_response.read(10240)
  base.dl_bytes_so_far += len(chunk)
  base.tarball_file.write(chunk)

  if not chunk:
    base.tarball_file.close()
    return False

  percent = float(base.dl_bytes_so_far) / base.dl_total_size
  base.progressbar.set_fraction(percent)
  percent = round(percent*100, 2)
  base.progressbar.set_text("Downloaded %d" % (percent) + '%')
  
  sys.stdout.write("Downloaded %d of %d bytes (%0.2f%%)\r" % (base.dl_bytes_so_far, base.dl_total_size, percent))

  if base.dl_bytes_so_far >= base.dl_total_size:
    sys.stdout.write('\n')

  return True

class TorBrowserLauncher:
  def __init__(self, current_tbb_version):
    # initialize the app
    self.current_tbb_version = current_tbb_version
    self.discover_arch_lang();
    self.build_paths();
    self.mkdirs();

    launch_gui = True

    # is TBB already installed?
    if os.path.isfile(self.paths['file']['start']) and os.access(self.paths['file']['start'], os.X_OK):
      # does the version file exist?
      if os.path.isfile(self.paths['file']['version']):
        installed_tbb_version = open(self.paths['file']['version']).read().strip()

        if installed_tbb_version == current_tbb_version:
          # current version is tbb is installed, launch it
          subprocess.call([self.paths['file']['start']])
          launch_gui = False
        elif installed_tbb_version < self.current_tbb_version:
          # there is a tbb upgrade available
          self.set_gui('task', "Your Tor Browser Launcher is out of date. Click Start to download the\nlatest version from https://www.torproject.org.", ['download_tarball', 'download_tarball_sig', 'verify', 'extract', 'run'])
        else:
          # for some reason the installed tbb is newer than the current version?
          self.set_gui('error', "Something is wrong. The version of Tor Browser Bundle\nyou have installed is newer than the current version?")

      else:
        # if tbb is installed but the version file doesn't exist, something is wrong
        self.set_gui('error', "Something is wrong. You have the Tor Browser Bundle\ninstalled, but the version file is missing.")

    # not installed
    else:
      # save the current version to the file
      open(self.paths['file']['version'], 'w').write(self.current_tbb_version)

      # are the tarball and sig already downloaded?
      if os.path.isfile(self.paths['file']['tarball']) and os.path.isfile(self.paths['file']['tarball_sig']):
        # start the gui with verify
        self.set_gui('task', "You already have Tor Browser Bundle downloaded, but\nit isn't installed yet.", ['verify', 'extract', 'run'])

      # first run
      else:
        self.set_gui('task', "The first time you run the Tor Browser Launcher you need to download\nthe Tor Browser Bundle. Click Start to download it now from\nhttps://www.torproject.org/.", ['download_tarball', 'download_tarball_sig', 'verify', 'extract', 'run'])

    if launch_gui:
      self.build_ui()
      gtk.main()
  
  # discover the architecture and language
  def discover_arch_lang(self):
    # figure out the architecture
    self.architecture = subprocess.check_output(['arch']).strip('\n')

    # figure out the language
    available_languages = ['en-US', 'ar', 'de', 'es-ES', 'fa', 'fr', 'it', 'ko', 'nl', 'pl', 'pt-PT', 'ru', 'vi', 'zh-CN']
    self.language = locale.getdefaultlocale()[0].replace('_', '-')
    if self.language not in available_languages:
      self.language = self.language.split('-')[0]
      if self.language not in available_languages:
        for l in available_languages:
          if l[0:2] == self.language:
            self.language = l
    # if language isn't available, default to english
    if self.language not in available_languages:
      self.language = 'en-US'

  # build all relevant paths
  def build_paths(self):
    tbb_data = os.getenv('HOME')+'/.torbrowser'
    tarball_filename = 'tor-browser-gnu-linux-'+self.architecture+'-'+self.current_tbb_version+'-dev-'+self.language+'.tar.gz'

    self.paths = {
      'dir': {
        'data': tbb_data,
        'download': tbb_data+'/download',
        'tbb': tbb_data+'/tbb/'+self.architecture
      },
      'file': {
        'version': tbb_data+'/version',
        'start': tbb_data+'/tbb/'+self.architecture+'/tor-browser_'+self.language+'/start-tor-browser',
        'tarball': tbb_data+'/download/'+tarball_filename,
        'tarball_sig': tbb_data+'/download/'+tarball_filename+'.asc'
      },
      'url': {
        'tarball': 'https://www.torproject.org/dist/torbrowser/linux/'+tarball_filename,
        'tarball_sig': 'https://www.torproject.org/dist/torbrowser/linux/'+tarball_filename+'.asc'
      },
      'filename': {
        'tarball': tarball_filename,
        'tarball_sig': tarball_filename+'.asc'
      }
    }

  # create directories that don't exist
  def mkdirs(self):
    if os.path.exists(self.paths['dir']['download']) == False:
      os.makedirs(self.paths['dir']['download'])
    if os.path.exists(self.paths['dir']['tbb']) == False:
      os.makedirs(self.paths['dir']['tbb'])

  # there are different GUIs that might appear, this sets which one we want
  def set_gui(self, gui, message, tasks):
    self.gui = gui
    self.gui_message = message
    self.gui_task = tasks

  # build the application's UI
  def build_ui(self):
    self.timer = False

    self.window = gtk.Window(gtk.WINDOW_TOPLEVEL)
    self.window.set_title("Tor Browser Launcher")
    self.window.set_border_width(10)
    
    self.window.connect("delete_event", self.delete_event)
    self.window.connect("destroy", self.destroy)

    self.box = gtk.VBox(False, 20)
    self.window.add(self.box)

    self.label = gtk.Label("The first time you run the Tor Browser Launcher you need to download the Tor Browser Bundle. Would you like to download it from the following URL now?")
    self.label.set_line_wrap(True)
    self.box.pack_start(self.label, True, True, 0)
    self.label.show()

    self.progressbar = gtk.ProgressBar(adjustment=None)
    self.progressbar.set_orientation(gtk.PROGRESS_LEFT_TO_RIGHT)
    self.box.pack_start(self.progressbar, True, True, 0)

    self.button_box = gtk.HButtonBox()
    self.button_box.set_layout(gtk.BUTTONBOX_SPREAD)
    self.box.pack_start(self.button_box, True, True, 0)
    self.button_box.show()

    self.download = gtk.Button("Download")
    self.download.connect("clicked", self.start_download, None)
    self.button_box.add(self.download)
    self.download.show()

    self.exit = gtk.Button("Exit")
    self.exit.connect("clicked", self.destroy, None)
    self.button_box.add(self.exit)
    self.exit.show()

    self.box.show()
    self.window.show();

  def delete_event(self, widget, event, data=None):
    return False
  
  def destroy(self, widget, data=None):
    if self.timer:
      gobject.source_remove(self.timer)
    self.timer = False

    gtk.main_quit()
   
  def start_download(self, widget, data=None):
    print 'Starting to download '+self.tarball_url

    # disable the download button
    self.download.set_sensitive(False)

    # initialize the progress bar
    self.progressbar.set_fraction(0) 
    self.progressbar.set_text('Downloaded 0%')
    self.progressbar.show()

    # start the download
    self.dl_response = urllib2.urlopen(self.tarball_url);
    
    self.dl_total_size = self.dl_response.info().getheader('Content-Length').strip()
    self.dl_total_size = int(self.dl_total_size)
    self.dl_bytes_so_far = 0

    # set a timer to download more chunks
    self.timer = gobject.timeout_add(1, download_chunk, self)

    # open a file to write to
    self.tarball_file = open(self.tarball_path, 'w')
      
if __name__ == "__main__":
  print 'Tor Browser Launcher'
  print 'https://github.com/micahflee/torbrowser-launcher'

  current_tbb_version = '2.3.25-2'
  app = TorBrowserLauncher(current_tbb_version)