#!/usr/bin/env python3
# File: logout-manager-tcl.py
# License: CC-BY-SA 4.0
# Author: bgstack15
# Startdate: 2019-06-12 20:05
# Title: Tcl/tk-based logout manager
# Purpose: A tcl/tk graphical program for selecting shutdown, logout, etc.
# History:
# Usage:
# References:
#    http://effbot.org/tkinterbook/button.htm
#    http://effbot.org/tkinterbook/tkinter-application-windows.htm
#    http://effbot.org/tkinterbook/
#    pass parameters to function of Button(command=) https://stackoverflow.com/questions/38749620/python-3-tkinter-button-commands#38750155
#    alternate for passing params https://stackoverflow.com/questions/6920302/how-to-pass-arguments-to-a-button-command-in-tkinter
#    https://stackoverflow.com/questions/18537918/set-window-icon#18538416
#    the exact syntax <Alt-k> for master.bind https://stackoverflow.com/questions/16082243/how-to-bind-ctrl-in-python-tkinter
#    https://pillow.readthedocs.io/en/stable/reference/ImageTk.html
#    gtk-3.0 default icon theme https://coderwall.com/p/no3qfa/setting-gtk2-and-gtk3-theme-via-config-file
#    homedir https://stackoverflow.com/questions/4028904/how-to-get-the-home-directory-in-python
#    natural sort https://stackoverflow.com/questions/46228101/sort-list-of-strings-by-two-substrings-using-lambda-function/46228199#46228199
# Improve:
#    add tooltips
#    add svg support
# Dependencies:
#    python36-tkinter | python3-tk
#    python36-pillow-tk | python3-pil.imagetk

import os, sys, configparser, glob, re
from tkinter import *
from functools import partial
from pathlib import Path
from PIL import Image, ImageTk
sys.path.append("/home/bgirton/dev/logout-manager")
import lmlib
#if TkVersion < 8.6:
#   USE_PRIVATE_TCL_IMAGES = 1
#   print("Loading private PIL translation layter")
#   def PhotoImage_from_png(file):
#      return ImageTk.PhotoImage(file=file)

config = lmlib.Initialize_config()
actions = lmlib.Actions

# graphical classes and functions
print("Loading graphics...")

def get_gtk3_default_theme():
   # abstracted so it does not clutter get_scaled_icon
   name = "hicolor"
   gtk3_config_path = os.path.join(os.path.expanduser("~"),".config","gtk-3.0","settings.ini")
   gtk3_config = configparser.ConfigParser()
   gtk3_config.read(gtk3_config_path)
   try:
      if 'Settings' in gtk3_config:
         name = gtk3_config['Settings']['gtk-icon-theme-name']
      elif 'settings' in gtk3_config:
         name = gtk3_config['settings']['gtk-icon-theme-name']
   except:
      # supposed failsafe
      name = "hicolor"
   return name

def tryint(s):
   try:
      return int(s)
   except:
      return s

def sort_sizes(x):
   # I don't even know how this works. I mashed it together from so#46228101
   # WORKS return [tryint(c) for c in re.split('([0-9]+)',x.split("/")[5])]
   value = x.split("/")[5]
   #return int(re.split("[^0-9]+",value)[0]) * 100 + int( re.split("[^0-9]+",value)[1] if len(value.split("@")) >= 2 else 0 )
   return mynum(value, "all")

def mynum(x, type = "all"):
   # return the complicated numerical value for the weird size options
   f = re.split("[^0-9]+",x)
   if type == "all":
      return int(f[0]) * 100 + int( f[1] if len(f) >= 2 else 0 )
   else:
      return int(f[0])

def find_best_size_match(size, thelist):
   # return item from sorted thelist whose split("/")[5] is the first to meet or exceed the requested size
   try:
      default = thelist[-1]
   except:
      default = None
   return next(( i for i in thelist if mynum(i.split("/")[5],"real") >= size ), default)

def get_filename_of_icon(name, theme = "hicolor", size = 48, category = "actions"):
   # poor man's attempt at walking through fd.o icon theme
   filename = None
   # example: Adwaita system-log-out

   if theme == "default" or theme is None:
      theme = "hicolor"

   # first, find all files underneath /usr/share/icons/$THEME/$SIZE
   print("Finding filename of icon, theme=",theme,"category=",category,"name=",name)
   # WORKHERE: this glob affects if scalable/ dir is included. When support for svg is added (which is beyond PIL), need to add a conditional and use a second glob if USE_SVG=1.
   results = glob.glob("/usr/share/icons/"+theme+"/*[0-9]*/"+category+"/"+name+".*")
   # the sort arranges it so a Numix/24 dir comes before a Numix/24@2x dir
   results = sorted(results, key=sort_sizes)
   #print(results)
   # now find the first one that matches
   filename = find_best_size_match(size,results)
   return filename

def get_scaled_icon(icon_name, size = 24, fallback_icon_name = "", icon_theme = "default"):
   iconfilename = None

   # if name is a specific filename, just use it.
   if Path(icon_name).is_file():
      #print("This is a file:",icon_name)
      iconfilename = icon_name
   else:

      if icon_theme == "default":
         # retrieve default theme from config file
         #print("Discovering default icon theme...")
         icon_theme = get_gtk3_default_theme()
      # so now that icon_theme is defined, let us go find the icon that matches the requested name and size, in the actions category
      #print("Using icon theme",icon_theme)
      iconfilename = get_filename_of_icon(name=icon_name, theme=icon_theme, size=size, category=config.get_icon_category())
   
   # So now that we think we have derived the correct filename...
   try:
      print("Trying icon file",iconfilename)
      photo = Image.open(iconfilename)
   except:
      print("Error with icon file.")
      return None
   # If I ever add HiDPI stuff, multiple size here by the factor. So, size * 1.25
   photo.thumbnail(size=[size, size])
   try:
      photo2 = ImageTk.PhotoImage(photo)
   except Exception as e:
      print("Error was ",e)
   return photo2

class App:
   def __init__(self, master):
      frame = Frame(master)
      frame.grid(row=0)

      self.buttonLock = Button(frame, text="Lock", underline=3, command=partial(actions.lock,config))
      self.buttonLock.grid(row=0,column=0)
      # WORKS master.bind_all("<Alt-k>", something)
      # PASSES 2 params when expecting 1  master.bind_all("<Alt-k>", self.buttonLock.invoke)
      master.bind_all("<Alt-k>", partial(actions.lock,config))

      # WORKS, for basic image loading.
      #self.photoLogout = get_scaled_icon("/usr/share/icons/Adwaita/48x48/actions/system-log-out.png")
      #self.buttonLogout = Button(frame, text="Logout", underline=0, command=lambda: actions.logout(config), image=self.photoLogout, compound=TOP)
      #self.photoLogout1 = Image.open("/usr/share/icons/Adwaita/48x48/actions/system-log-out.png")
      #self.photoLogout1.thumbnail(size=[24,24])
      #self.photoLogout = ImageTk.PhotoImage(self.photoLogout1,size="24x24")
      #self.photoLogout = get_scaled_icon("/usr/share/icons/Adwaita/48x48/actions/system-log-out.png", 24)
      #self.photoLogout = get_scaled_icon("system-log-out", 24, icon_theme="default")
      self.photoLogout = get_scaled_icon(config.get_logout_icon(), config.get_icon_size(), config.get_icon_theme())
      self.buttonLogout = Button(frame, text="Logout", underline=0, command=lambda: actions.logout(config), image=self.photoLogout, compound=LEFT)
      master.bind_all("<Alt-l>", partial(actions.logout,config))
      self.buttonLogout.grid(row=0,column=1)

      self.photoHibernate = get_scaled_icon(config.get_hibernate_icon(), config.get_icon_size(), config.get_icon_theme())
      self.buttonHibernate = Button(frame, text="Hibernate", underline=0, command=lambda: actions.hibernate(config), image=self.photoHibernate, compound=LEFT)
      self.buttonHibernate.grid(row=0,column=2)
      master.bind_all("<Alt-h>", partial(actions.hibernate,config))

      self.photoShutdown = get_scaled_icon(config.get_shutdown_icon(), config.get_icon_size(), config.get_icon_theme())
      self.buttonShutdown = Button(frame, text="Shutdown", underline=0, command=lambda: actions.shutdown(config), image=self.photoShutdown, compound=LEFT)
      self.buttonShutdown.grid(row=0,column=3)
      master.bind_all("<Alt-s>", partial(actions.shutdown,config))

      self.photoReboot = get_scaled_icon(config.get_reboot_icon(), config.get_icon_size(), config.get_icon_theme())
      self.buttonReboot = Button(frame, text="Reboot", underline=0, command=lambda: actions.reboot(config), image=self.photoReboot, compound=LEFT)
      self.buttonReboot.grid(row=0,column=4)
      master.bind_all("<Alt-r>", partial(actions.reboot,config))

      #self.buttonCancel = Button(frame, text="Cancel", underline=0, command=frame.quit)
      self.buttonCancel = Button(frame, text="Cancel", underline=0, command=self.quitaction)
      self.buttonCancel.grid(row=1,columnspan=8,sticky=W+E)
      master.bind_all("<Alt-c>", self.quitaction)

   # Found this after trial and error.
   def quitaction(self,b=None):
      print("Cancel any logout action.")
      root.destroy()

# Left here as an example for a mster.bind_all that works.
#def something(event=None):
#   print("Got here!")

root = Tk()

# MAIN LOOP
root.title("Log out options")
#root.iconbitmap(r'/usr/share/icons/Numix/48/actions/system-logout.svg')
imgicon = get_scaled_icon(config.get_logout_icon(),24)
#if USE_PRIVATE_TCL_IMAGES is None:
#   #imgicon = PhotoImage(file=os.path.join("/usr/share/icons/Adwaita/24x24/actions","system-log-out.png"))
#   imgicon = get_scaled_icon(config.get_logout_icon(),24)
#else:
#   #imgicon = PhotoImage_from_png(file=os.path.join("/usr/share/icons/Adwaita/24x24/actions","system-log-out.png"))
#   imgicon = get_scaled_icon(config.get_logout_icon(),24)
root.tk.call('wm','iconphoto', root._w, imgicon)
app = App(root)
root.mainloop()
try:
   root.destroy()
except:
   pass