#!/usr/bin/env python3
# vim: set ts=3 sts=3 sw=3 et:
# File: src/tkstackrpms/tkstackrpms.py
# Location: https://bgstack15.ddns.net/cgit/tkstackrpms/
# Author: bgstack15
# Startdate: 2024-03-28-5 14:49
# Title: Stackrpms extensions to Tcl/Tk - Python 3.x library
# Purpose: My small additions to tkinter
# Project: python3-tkstackrpms
# History:
#    2024-03-28 started as component of srb_lib
#    2024-04-07 moved to its own project
# Usage:
#    import tkstackrpms as stk
# References:
#    logout-manager-tcl, lmlib.py
#    file:///usr/include/X11/keysymdef.h
#    http://stackoverflow.com/questions/3221956/what-is-the-simplest-way-to-make-tooltips-in-tkinter/36221216#36221216
#    https://stackoverflow.com/questions/63871376/tkinter-widget-cgetvariable/63871784#63871784
#    https://coderslegacy.com/python/create-a-status-bar-in-tkinter/
#    https://stackoverflow.com/questions/38329996/enable-mouse-wheel-in-spinbox-tk-python
#    https://insolor.github.io/effbot-tkinterbook-archive/tkinter-events-and-bindings.htm
#    https://stackoverflow.com/questions/27533244/how-to-make-a-flashing-text-box-in-tkinter/78277443#78277443
# Improve:
# Dependencies:
#    dep-devuan: python3-tkinter, python3-pil.imagetk
#    rec-devuan: python3-cairosvg
import sys
try:
   from tkinter import *
except ModuleNotFoundError:
   print(f"Fatal! Library tkstackrpms needs tkinter and more, which are not packaged by pip. Try OS packages python3-tk, python3-pil.imagetk.",file=sys.stderr)
   sys.exit(1)
from tkinter import Spinbox as tkSpinbox, Checkbutton as tkCheckbutton, Entry as tkEntry, Radiobutton as tkRadiobutton
from pathlib import Path
import glob, re, os, configparser
# has to happen after tkinter
try:
   from PIL import Image, ImageTk
except ModuleNotFoundError as e:
   print(f"Fatal! Library tkstackrpms needs pil.imagetk which is part of pillow. Try OS package python3-pil.imagetk or pip install pillow.",file=sys.stderr)
   print(e,file=sys.stderr)
   sys.exit(1)

USE_SVG = False
try:
   from cairosvg import svg2png
   USE_SVG = True
except:
   print(f"Warning: Library tkstackrpms uses cairosvg to work with SVG images. You can continue without svg support, or retry after getting OS package python3-cairosvg or pip install cairosvg.",file=sys.stderr)

MAX_RECURSION = 10 # safety valve for any recursion

class Tooltip:
   """
   It creates a tooltip for a given widget as the mouse goes on it.
   see:
   http://stackoverflow.com/questions/3221956/
          what-is-the-simplest-way-to-make-tooltips-
          in-tkinter/36221216#36221216
   http://www.daniweb.com/programming/software-development/
          code/484591/a-tooltip-class-for-tkinter
   - Originally written by vegaseat on 2014.09.09.
   - Modified to include a delay time by Victor Zaccardo on 2016.03.25.
   - Modified
       - to correct extreme right and extreme bottom behavior,
       - to stay inside the screen whenever the tooltip might go out on
         the top but still the screen is higher than the tooltip,
       - to use the more flexible mouse positioning,
       - to add customizable background color, padding, waittime and
         wraplength on creation
     by Alberto Vassena on 2016.11.05. Improved by Stevoisiak (https://stackoverflow.com/users/3357935/stevoisiak) and crxguy52 (https://stackoverflow.com/users/6106104/crxguy52)
     Tested on Ubuntu 16.04/16.10, running Python 3.5.2
   """
   def __init__(self, widget,
                *,
                bg='#FFFFEA',
                pad=(5, 3, 5, 3),
                text='widget info',
                waittime=400,
                wraplength=250):
      self.waittime = waittime  # in miliseconds, originally 500
      self.wraplength = wraplength  # in pixels, originally 180
      self.widget = widget
      self.text = text
      self.widget.bind("<Enter>", self.onEnter)
      self.widget.bind("<Leave>", self.onLeave)
      self.widget.bind("<ButtonPress>", self.onLeave)
      self.bg = bg
      self.pad = pad
      self.id = None
      self.tw = None

   def onEnter(self, event=None):
      self.schedule()

   def onLeave(self, event=None):
      self.unschedule()
      self.hide()

   def schedule(self):
      self.unschedule()
      self.id = self.widget.after(self.waittime, self.show)

   def unschedule(self):
      id_ = self.id
      self.id = None
      if id_:
         self.widget.after_cancel(id_)

   def show(self):
      def tip_pos_calculator(widget, label,
                             *,
                             tip_delta=(10, 5), pad=(5, 3, 5, 3)):
         w = widget
         s_width, s_height = w.winfo_screenwidth(), w.winfo_screenheight()
         width, height = (pad[0] + label.winfo_reqwidth() + pad[2],
                          pad[1] + label.winfo_reqheight() + pad[3])
         mouse_x, mouse_y = w.winfo_pointerxy()
         x1, y1 = mouse_x + tip_delta[0], mouse_y + tip_delta[1]
         x2, y2 = x1 + width, y1 + height
         x_delta = x2 - s_width
         if x_delta < 0:
            x_delta = 0
         y_delta = y2 - s_height
         if y_delta < 0:
            y_delta = 0
         offscreen = (x_delta, y_delta) != (0, 0)
         if offscreen:
            if x_delta:
               x1 = mouse_x - tip_delta[0] - width
            if y_delta:
               y1 = mouse_y - tip_delta[1] - height
         offscreen_again = y1 < 0  # out on the top
         if offscreen_again:
            # No further checks will be done.
            # TIP:
            # A further mod might automagically augment the
            # wraplength when the tooltip is too high to be
            # kept inside the screen.
            y1 = 0
         return x1, y1
      bg = self.bg
      pad = self.pad
      widget = self.widget
      # creates a toplevel window
      self.tw = Toplevel(widget)
      # Leaves only the label and removes the app window
      self.tw.wm_overrideredirect(True)
      win = Frame(self.tw,
                     background=bg,
                     borderwidth=0)
      label = Label(win,
                       text=self.text,
                       justify=LEFT,
                       background=bg,
                       relief=SOLID,
                       borderwidth=0,
                       wraplength=self.wraplength)
      label.grid(padx=(pad[0], pad[2]),
                 pady=(pad[1], pad[3]),
                 sticky=NSEW)
      win.grid()
      x, y = tip_pos_calculator(widget, label)
      self.tw.wm_geometry("+%d+%d" % (x, y))

   def hide(self):
      tw = self.tw
      if tw:
         tw.destroy()
      self.tw = None

def mynum(x, type = "all"):
   # return the complicated numerical value for the weird size options
   f = re.split("[^0-9]+",x)
   try:
      f0 = int(f[0])
   except:
      f0 = 0
   try:
      f1 = int(f[1])
   except:
      f1 = 0
   if type == "all":
      return f0 * 100 + f1 if len(f) >= 2 else 0
   else:
      return f0

def image_from_svg(filename = "",size = "48"):
   # open svg
   if USE_SVG == 1:
      svg2png(url=filename,write_to="/tmp/lm_temp_image.png",parent_width = size,parent_height = size)
      photo = Image.open("/tmp/lm_temp_image.png")
   else:
      photo = Image.new("RGBA",[size,size])
   return photo

def sort_sizes(x):
   # Original reference so#46228101
   value = x.split("/")[5]
   return mynum(value, "all")

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 empty_photoimage(size=24):
   photo = Image.new("RGBA",[size,size])
   return ImageTk.PhotoImage(image=photo)

def get_scaled_icon(icon_name, size = 24, icon_theme = "default", fallback_icon_name = "", category = "actions"):
   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":
         # this should not happen, because the Initialize_config should have checked gtk3 default value.
         icon_theme = "hicolor"
      # 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)
      # category is the fd.o icon category. logout-manager-tcl hardcoded "action"
      iconfilename = get_filename_of_icon(name=icon_name, theme=icon_theme, size=size, category=category, allow_svg = USE_SVG)
   # So now we think we have derived the correct filename
   try:
      #print("Trying icon file",iconfilename)
      # try an svg
      if re.compile(r".*\.svg").match(iconfilename):
         #print("Trying svg...")
         photo = image_from_svg(filename=iconfilename, size=size)
      else:
         photo = Image.open(iconfilename)
   except Exception as f:
      print(f"Error with icon file: {f}.",file=sys.stderr)
      return empty_photoimage()
   photo.thumbnail(size=[size, size])
   try:
      photo = ImageTk.PhotoImage(photo)
   except Exception as e:
      print("Error was ",e,file=sys.stderr)
   # If I ever add HiDPI support, multiple size here by the factor. So, size * 1.25
   return photo

def get_filename_of_icon(name, theme = "hicolor", size = 48, category = "actions", allow_svg = False):
   # 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:
      try:
         theme = get_gtk3_default_icon_theme()
      except:
         theme = "hicolor"
   # first, find all files underneath /usr/share/icons/$THEME/$SIZE
   #print("Finding filename of icon, theme=",theme,"category=",category,"name=",name)
    # to exclude the scalable/ contents, replace dir 5 asterisk with [0-9]*
   results = []
   base_dir = "/usr/share/icons/"
   file_filters = ".*"
   if not allow_svg:
      file_filters = ".{png,PNG}"
   # I have no idea if this is xdg icon theme compliant, but it is a valiant attempt.
   # 1. try (requested) req-theme, req-category, req-name first
   results = glob.glob(base_dir+theme+"/*/"+category+"/"+name+file_filters)
   # 2. try req-theme, (generic) gen-category, req-name
   if len(results) == 0:
      # no results with that category, so try all categories
      results = glob.glob(base_dir+theme+"/*/*/"+name+file_filters)
   # 3. try "gnome", req-category, req-name
   if len(results) == 0:
      results = glob.glob(base_dir+"gnome"+"/*/"+category+"/"+name+file_filters)
   # 4. try "gnome", gen-category, req-name
   if len(results) == 0:
      results = glob.glob(base_dir+"gnome"+"/*/*/"+name+file_filters)
   # 5. try "hicolor", req-category, req-name
   if len(results) == 0:
      results = glob.glob(base_dir+"hicolor"+"/*/"+category+"/"+name+file_filters)
   # 6. try "hicolor", gen-category, req-name
   if len(results) == 0:
      results = glob.glob(base_dir+"hicolor"+"/*/*/"+name+file_filters)
   # 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_gtk3_default_icon_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: keep name = hicolor
      pass
   #print("Found gtk3 default theme:",name)
   return name

class StatusBar(Frame):
   def __init__(self, master, var = None):
      Frame.__init__(self, master, borderwidth = 1, background = "darkgray")
      if var:
         self.label = Label(self,textvariable=var)
      else:
         self.label = Label(self)
      self.label.pack(side=LEFT)
      #self.pack(side=BOTTOM, fill=X)
      self.grid(row=100,column=0,columnspan=100)
   def set(self, newText):
      self.label.config(text=newText)
   def clear(self):
      self.label.config(text="")

class Spinbox(tkSpinbox):
   """
   This enables mouse scrolling without having to add it to each instance.
   """
   def __init__(self, *args, **kwargs):
      tkSpinbox.__init__(self, *args, **kwargs)
      self.bind('<MouseWheel>', self.mouseWheel)
      self.bind('<Button-4>', self.mouseWheel)
      self.bind('<Button-5>', self.mouseWheel)

   def mouseWheel(self, event):
      if event.num == 5 or event.delta == -120:
         self.invoke('buttondown')
      elif event.num == 4 or event.delta == 120:
         self.invoke('buttonup')

class Checkbutton(tkCheckbutton):
   """
   Add a specific function to these key-up/button-up sequences, without having to add it to each instance individually.
   """
   def __init__(self, *args, **kwargs):
      func = None
      if "func" in kwargs.keys():
         func = kwargs.pop("func")
      tkCheckbutton.__init__(self, *args, **kwargs)
      if func:
         self.bind("<ButtonRelease-1>",func)
         self.bind("<KeyRelease-space>",func)
         self.bind("<KeyRelease-Return>",func)

class Entry(tkEntry):
   def __init__(self, *args, **kwargs):
      func = None
      if "func" in kwargs.keys():
         func = kwargs.pop("func")
      tkEntry.__init__(self, *args, **kwargs)
      if func:
         self.bind("<Key-Return>",func)
         self.bind("<Key-KP_Enter>",func)
         # Do not need specific shift-tab stuff because FocusOut is possible!
         #self.bind("<Key-Tab>",func)
         #self.bind("<Shift-KeyPress-Tab>",func)
         self.bind("<FocusOut>",func)

class Radiobutton(tkRadiobutton):
   """
   Extends tkRadioButton:
   * Store self.__var attribute that connects to the tk.IntVar() used
   * Moves between all associated radio buttons with up/down keys!
   """
   @property
   def var(self):
      return self.__var

   @property
   def value(self) -> int:
      return self.__var.get()

   @value.setter
   def value(self, value):
      self.__var.set(int(value))

   def __init__(self, *args, **kwargs):
      self.__var = tk.IntVar() if not "variable" in kwargs else kwargs["variable"]
      tkRadiobutton.__init__(self, *args, **{**kwargs, "variable":self.__var})
      self.bind("<Key-Down>",self.scroll_with_keys)
      self.bind("<Key-Up>",self.scroll_with_keys)
      self.bind("<Key-Home>",self.scroll_with_keys)
      self.bind("<Key-End>",self.scroll_with_keys)

   def add_item_if_var_matches(self, otherwidget, samevar, thelist):
      j1 = None
      try:
         j1 = otherwidget.cget("variable")
      except:
         pass
      if j1 == samevar:
         #print(f"found {otherwidget} that uses var {j1}")
         thelist.append(otherwidget)
      return thelist

   def list_all_child_items_that_use_var(self, thistoplevel, thisvar, thislist, depth):
      # safety valve
      if depth >= MAX_RECURSION:
         raise Exception("You dug too deep with recursion in list_all_child_items")
      for i in thistoplevel.winfo_children():
         thislist = self.add_item_if_var_matches(i,thisvar,thislist)
         thislist = self.list_all_child_items_that_use_var(i,thisvar,thislist,depth+1) # recurse
      return thislist

   def widget_key(self,a):
      """ Used to sort radio options by 'value'. """
      aval = None
      try:
         aval = a.cget("value")
      except:
         pass
      return aval

   def scroll_with_keys(self, arg1 = None, arg2 = None, arg3 = None):
      """ This depends on you setting the object.var property to match the variable. """
      # prepare all items that also use this variable
      # nametowidget is a tk trick to get the top-level parent object of the current widget. That is, the app or top window.
      items = self.list_all_child_items_that_use_var(self.nametowidget("."),self.cget("variable"),[],depth=0)
      # sort them by value, in case they are not in order
      items.sort(key=self.widget_key)
      # we are using 1-indexing here.
      items.insert(0, None)
      #print(f"debug: now have items {items}")
      # prepare the operation
      direction = None
      if arg1.keysym == "Up":
         direction = +1
      elif arg1.keysym == "Down":
         direction = +0
      #print(f"Must go direction {direction} in list {items}, using {self.__var.get()}")
      # Because of the 1-indexing, by always adding one, we do scroll through the values the way you would expect.
      if direction is not None:
         self.__var.set((self.__var.get()+direction) % (len(items)-1) + 1)
      elif arg1.keysym in ["Home"]:
         self.__var.set(items[1].cget("value"))
      elif arg1.keysym in ["End"]:
         self.__var.set(items[-1].cget("value"))
      # and now focus on the object whose value matches
      for i in items:
         i1 = None
         try:
            i1 = i.cget("value")
         except:
            pass
         if i1 == self.__var.get():
            i.focus()
            break

def flash_entry(this_entry, colorlist, ms = 1000):
   """
   Flash the offending entry box through the colorlist, one color every 'ms' milliseconds.
   Example:
      flash_entry(entry_that_was_invalid,["red","white"])
   """
   thiscolor = colorlist.pop(0)
   this_entry.config(background = thiscolor)
   if len(colorlist) > 0:
      top = this_entry._nametowidget(this_entry.winfo_parent())
      top.after(ms, lambda te=this_entry, c=colorlist, ms=ms: flash_entry(te,c,ms))