#!/usr/bin/python3
# startdate: 2020-09-24 13:17
# References:
#    vm2:~/dev/logout-manager/src/usr/bin/logout-manager-trayicon
#    gapan/xdgmenumaker
# vim: ts=3 sw=3 sts=3
# IMPROVE:
#   use inotify for when to call reestablish_menu?
#   move out config to separate file (read main .conf, but in shell format)
# add separator and "hide this icon" menu item like logout-manager-trayicon
# fix tabbing
# remove /sdb? (as option)
# hook up the click action to actually executing "xdg-open /browse/sdb"

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

# 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))

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()

   def reestablish_menu(self,widget = None):
      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(["/media"]):
         print('Label {} icon {}'.format(entry.app.name,entry.app.icon))
         self.add_action_to_menu(str(entry.app.name.decode("utf-8")),entry.app.path,entry.app.icon,self.dummy_action,entry.app.command)
      #self.add_action_to_menu("foobar"+str(myrand),"media-floppy",self.dummy_action,"foo bar baz action "+str(myrand))
      #self.add_action_to_menu("mmc","media-flash-sd-mmc",self.dummy_action,"flubber second action")
      #self.add_action_to_menu("what is this?","media-tape",self.dummy_action,"call ALF!")
      self.add_separator_to_menu()
      self.add_action_to_menu("Update menu","",None,self.reestablish_menu,"re establish")
      self.add_action_to_menu("Hide this icon","","system-logout",self.exit,"exit")
      self.menuitem_count = len(self.menuitems) - 1
      self.set_tooltip_text(str(self.menuitem_count)+" mount point"+("s" if self.menuitem_count > 1 else ""))

   def UNUSED_transform_command(self, entry_command):
      return entry_command.replace("xdg-open ","umount ")

   def dummy_action(self, widget):
      print("hello world")
      x=0
      y=-1
      for n in widget.get_parent().get_children():
         x+=1
         if widget == n:
            y=x-1
            break
      print(y)
      print(self.menuitems[y])
   def add_separator_to_menu(self):
      i=Gtk.SeparatorMenuItem.new()
      i.set_visible(True)
      self.traymenu.append(i)
   def add_action_to_menu(self,label_str,label_paren_str,icon_str,function_func,action_str):
      self.menuitems.append(action_str)
      full_label_str=label_str
      if label_paren_str is not None and 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:
         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 exit(self, widget):
      quit()

#print(desktopfilelist(["/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

#for entry in get_desktop_entries(["/media"]):
#    print('label {} icon {}'.format(entry.app.name,entry.app.icon))
# MAIN
icon = MainIcon()
Gtk.main()