#!/usr/bin/python3
# File: automount-trayicon.py
# startdate: 2020-09-24 13:17
# References:
#    https://gitlab.com/bgstack15/logout-manager/-/blob/master/src/usr/bin/logout-manager-trayicon
#    https://github.com/gapan/xdgmenumaker/blob/master/src/xdgmenumaker
#    https://github.com/seb-m/pyinotify/blob/master/python2/examples/stats_threaded.py
#    https://stackoverflow.com/questions/28279363/python-way-to-get-mounted-filesystems/28279434#28279434
#    timer https://python-gtk-3-tutorial.readthedocs.io/en/latest/spinner.html?highlight=timer#id1
# vim: ts=3 sw=3 sts=3
# Improve:
#    move out config to separate file (read main .conf, but in shell format)
#    add all headers
#    document
# Dependencies:
#    autofs, root running the included stackrpms-automount

import gi, os, fnmatch, sys, pyinotify, time, subprocess
gi.require_version("Gtk","3.0")
from gi.repository import Gtk, Gdk, GLib
import xdg.DesktopEntry as dentry
import xdg.Exceptions as exc

showmount = 1                  # show the "MOUNTED" value for each drive
skip_sd_without_partitions = 1 # skip sdb sdc, etc.  # NOT IMPLEMENTED YET.
only_update_on_menuitem = 0    # if 1, then disables the mouseover poll. Prevents showmount=1 from working.
AUTOMOUNT_BASEDIR="/media"
AUTOMOUNT_BROWSEDIR="/browse"

# FUNCTIONS

class App:
   '''
   A class to keep individual app details in.
   '''

   def __init__(self, name, icon, command, path):
      self.name = name
      self.icon = icon
      self.command = command
      self.path = path

   def __repr__(self):
      return repr((self.name, self.icon, self.command, self.path))

class MenuEntry:
   '''
   A class for each menu entry. Includes the class category and app details
   from the App class.
   '''

   def __init__(self, category, app):
      self.category = category
      self.app = app

   def __repr__(self):
       return repr((self.category, self.app.name, self.app.icon, self.app.command, self.app.path))

class Identity(pyinotify.ProcessEvent):
   activity_count = 0
   def process_default(self, event):
      print(self,"Does nothing with the event number",self.activity_count)
      self.activity_count += 1
      #print(event)

def remove_command_keys(command, desktopfile, icon):
   # replace the %i (icon key) if it's there. This is what freedesktop has to
   # say about it: "The Icon key of the desktop entry expanded as two
   # arguments, first --icon and then the value of the Icon key. Should not
   # expand to any arguments if the Icon key is empty or missing."
   if icon:
      command = command.replace('"%i"', '--icon {}'.format(icon))
      command = command.replace("'%i'", '--icon {}'.format(icon))
      command = command.replace('%i', '--icon {}'.format(icon))
   # some KDE apps have this "-caption %c" in a few variations. %c is "The
   # translated name of the application as listed in the appropriate Name key
   # in the desktop entry" according to freedesktop. All apps launch without a
   # problem without it as far as I can tell, so it's better to remove it than
   # have to deal with extra sets of nested quotes which behave differently in
   # each WM. This is not 100% failure-proof. There might be other variations
   # of this out there, but we can't account for every single one. If someone
   # finds one another one, I can always add it later.
   command = command.replace('-caption "%c"', '')
   command = command.replace("-caption '%c'", '')
   command = command.replace('-caption %c', '')
   # replace the %k key. This is what freedesktop says about it: "The
   # location of the desktop file as either a URI (if for example gotten from
   # the vfolder system) or a local filename or empty if no location is
   # known."
   command = command.replace('"%k"', desktopfile)
   command = command.replace("'%k'", desktopfile)
   command = command.replace('%k', desktopfile)
   # removing any remaining keys from the command. That can potentially remove
   # any other trailing options after the keys,
   command = command.partition('%')[0]
   return command

def icon_strip(icon):
   # strip the directory and extension from the icon name
   icon = os.path.basename(icon)
   main, ext = os.path.splitext(icon)
   ext = ext.lower()
   if ext == '.png' or ext == '.svg' or ext == '.svgz' or ext == '.xpm':
      return main
   return icon

def get_entry_info(desktopfile, ico_paths=True):
   # customized from gapan/xdgmenumaker
   de = dentry.DesktopEntry(filename=desktopfile)

   name = de.getName().encode('utf-8')

   if True:
      icon = de.getIcon()
      # full resolution of path is not required in this GTK program.
      #if ico_paths:
      #    icon = icon_full_path(icon)
      #else:
      #    icon = icon_strip(icon)
   else:
      icon = None

   command = de.getExec()
   command = remove_command_keys(command, desktopfile, icon)

   terminal = de.getTerminal()
   if terminal:
      command = '{term} -e {cmd}'.format(term=terminal_app, cmd=command)

   path = de.getPath()
   if not path:
       path = None

   categories = de.getCategories()
   category = "Removable" # hardcoded xdg "category" for automount-trayicon

   app = App(name, icon, command, path)
   mentry = MenuEntry(category, app)
   return mentry

def desktopfilelist(params):
   # Ripped entirely from gapan/xdgmenumaker
   dirs = []
   for i in params:
      print("Checking dir",i)
      i = i.rstrip('/')
      if i not in dirs:
         dirs.append(i)
   filelist = []
   df_temp = []
   for d in dirs:
      xdgdir = '{}/'.format(d) # xdg spec is to use "{}/applications" as this string, so use an applications subdir.
      if os.path.isdir(xdgdir):
         for root, dirnames, filenames in os.walk(xdgdir):
            for i in fnmatch.filter(filenames, '*.desktop'):
               # for duplicate .desktop files that exist in more
               # than one locations, only keep the first occurence.
               # That one should have precedence anyway (e.g.
               # ~/.local/share/applications has precedence over
               # /usr/share/applications
               if i not in df_temp:
                  df_temp.append(i)
                  filelist.append(os.path.join(root, i))
   return filelist

class MainIcon(Gtk.StatusIcon):
   def __init__(self):
      Gtk.StatusIcon.__init__(self)
      self.set_from_icon_name("media-removable")
      self.traymenu = Gtk.Menu()
      self.connect("button-press-event", self.on_button_press_event)
      self.connect("popup-menu", self.context_menu)
      self.reestablish_menu()
      if not only_update_on_menuitem:
         self.connect("query-tooltip", self.mouseover)
      # need these anyway, for when the icon is hidden.
      self.wm1 = pyinotify.WatchManager()
      self.s1 = pyinotify.Stats()
      self.identity=Identity(self.s1) # provides self.identity.activity_counter which increments for every change to the watched directory
      self.activity_count=0 # the cached value, for comparison. Update the menu when this changes!
      self.notifier1 = pyinotify.ThreadedNotifier(self.wm1, default_proc_fun=self.identity)
      self.notifier1.start()
      self.wm1.add_watch(AUTOMOUNT_BASEDIR, pyinotify.IN_CREATE | pyinotify.IN_DELETE, rec=True, auto_add=True)

   def mouseover(self, second_self, x, y, some_bool, tooltip):
      #print("Mouseover happened at",str(x)+",",y,tooltip, some_bool)
      need_showmount=0
      if self.identity.activity_count != self.activity_count:
         # then we need to update menu
         print("Mouseover, and files have changed!")
         self.activity_count = self.identity.activity_count
         need_showmount=1
      if need_showmount or showmount:
         self.reestablish_menu()

   def reestablish_menu(self,widget = None, silent=False):
      if not silent:
         print("Reestablishing the menu")
      try:
         if self.menuitems:
            del self.menuitems
      except:
         pass
      try:
         for i in self.traymenu.get_children():
            self.traymenu.remove(i)
      except:
         pass
      self.menuitems = []
      for entry in get_desktop_entries([AUTOMOUNT_BASEDIR]):
         if not silent:
            print('{} {} {} {}'.format(entry.app.name.decode("utf-8"),entry.app.icon,entry.app.path,entry.app.command))
         self.add_menuitem(str(entry.app.name.decode("utf-8")),entry.app.path,entry.app.icon,self.execute,entry.app.command)
      self.add_separator_to_menu()
      if only_update_on_menuitem:
         self.add_menuitem("Update menu","",None,self.reestablish_menu,"re establish") # If you want a menu option for this
      self.add_menuitem("Hide until next disk change","","",self.hide,"hide")
      self.add_menuitem("Exit automount-trayicon","","system-logout",self.exit,"exit")
      self.menuitem_count = len(self.menuitems) - 2
      self.set_tooltip_text(str(self.menuitem_count)+" mount point"+("s" if self.menuitem_count > 1 else ""))

   def execute(self, widget):
      x=0 ; y=-1
      for n in widget.get_parent().get_children():
         x+=1
         if widget == n:
            y=x-1
            break
      if y > -1:
         print(y,self.menuitems[y])
         # use subprocess to open in background so failure to mount dialogs do not block the program
         subprocess.Popen(self.menuitems[y].split())
         #os.system(self.menuitems[y])
      else:
         print("Some kind of error?! How did this get called without a menu entry.")
      #print(repr(self.s1))

   def add_separator_to_menu(self):
      i=Gtk.SeparatorMenuItem.new()
      i.set_visible(True)
      self.traymenu.append(i)

   def add_menuitem(self,label_str,label_paren_str,icon_str,function_func,action_str):
      self.menuitems.append(action_str)
      full_label_str=label_str
      mounted_str=""
      # collection = [line.split()[1] for line in open("/etc/mtab") if line.split()[1].startswith('/browse') and line.split()[2] != "autofs"]
      if label_paren_str is not None and label_paren_str != "":
         if showmount:
            if label_paren_str in [line.split()[1] for line in open("/etc/mtab") if line.split()[1].startswith(AUTOMOUNT_BROWSEDIR) and line.split()[2] != "autofs"]:
               label_paren_str = "MOUNTED " + label_paren_str
         full_label_str += " (" + label_paren_str + ")"
      i = Gtk.ImageMenuItem.new_with_mnemonic(full_label_str)
      j = Gtk.Image.new_from_icon_name(icon_str,32)
      j.show()
      i.set_image(j)
      i.set_always_show_image(True)
      i.show()
      i.connect("activate", function_func)
      self.traymenu.append(i)

   def on_button_press_event(self, b_unknown, event: Gdk.EventButton):
      # for some reason the single click functionality prevents the double click functionality
      if Gdk.EventType._2BUTTON_PRESS == event.type:
         # not achievable if we are popping up the menu in the single click.
         print("Double click")
      else:
         print("Single click")
         self.traymenu.popup(None, None,
            self.position_menu,
            self,
            event.button,
            Gtk.get_current_event_time())

   def context_menu(self, widget, event_button, event_time):
      self.traymenu.popup(None, None,
         self.position_menu,
         self,
         event_button,
         Gtk.get_current_event_time())

   def hide(self, widget = None):
      print("Please hide self!")
      self.set_visible(False)
      self.start_timer()

   def start_timer(self):
      """ Start the timer """
      self.counter = 1000 # milliseconds, but hardly a precise timer. Do not use this for real calculations
      self.timeout_id = GLib.timeout_add(1,self.on_timeout, None)

   def stop_timer(self, reason_str):
      if self.timeout_id:
         GLib.source_remove(self.timeout_id)
         self.timeout_id = None
      #print("Timer was stopped!")
      self.check_reenable_now()

   def check_reenable_now(self):
      print("Need to check if anything has changed.")
      print(self.identity.activity_count,self.activity_count)
      if self.identity.activity_count != self.activity_count:
         self.set_visible(True)
         self.activity_count = self.identity.activity_count
         self.reestablish_menu()
      else:
         print("No changes...")
         self.hide()

   def on_timeout(self, *args, **kwargs):
      """ A timeout function """
      self.counter -= 1
      if self.counter <= 0:
         self.stop_timer("Reached time out")
         return False
      return True

   def exit(self, widget):
      self.notifier1.stop()
      quit()

   def __quit__(self):
      self.notifier1.stop()
      Gtk.StatusIcon.__quit__(self)

# Normally call get_desktop_entries with (["/media"])
def get_desktop_entries(dir_array):
   entries = []
   for desktopfile in desktopfilelist(dir_array):
      try:
         entry = get_entry_info(desktopfile, True)
         if entry is not None:
            #print(entry)
            entries.append(entry)
      except exc.ParsingError as Ex:
         print(Ex)
         pass
   return entries

# MAIN
icon = MainIcon()
Gtk.main()