#!/usr/bin/env python
# -*- coding: utf-8 -*-

from __future__ import division
from __future__ import print_function
from __future__ import unicode_literals
from __future__ import absolute_import

# cross-version compatibility
import sys
if sys.version_info.major < 3:
    import Tkinter as tk
    import ttk
    import tkFileDialog as tkfiledialog
else:
    import tkinter as tk
    from tkinter import ttk
    from tkinter import filedialog as tkfiledialog


class Example(ttk.Frame):
    def __init__(self, parent):
        # We can't use super() because in Python 2 the Tkinter objects
        # derive from old-style classes.
        ttk.Frame.__init__(self, parent, borderwidth=3)
        self.parent = parent

        # Create the Tkinter Variables
        self.destination_folder = tk.StringVar()
        self.archiver = tk.StringVar()
        self.compression = tk.StringVar()
        self.exclude_home = tk.BooleanVar()
        self.no_hidden = tk.BooleanVar()
        self.user_options = tk.StringVar()

        # Set default values to the Tkinter Variables
        self.destination_folder.set("/home/faramir")
        self.archiver.set("tar")
        self.compression.set("gzip")
        self.exclude_home.set(False)
        self.no_hidden.set(False)
        self.user_options.set("")

        self.create_UI()

    def create_UI(self):
        # set theming
        self.style = ttk.Style()
        self.style.theme_use("default")
        self.pack(fill="both", expand=1)

        # set grid configuration
        self.columnconfigure(1, weight=0)
        self.columnconfigure(2, weight=1)
        self.columnconfigure(3, weight=0)

        # add widgets
        self.add_choose_folder(row=1, text="Destination folder:", variable=self.destination_folder)
        self.add_combobox(row=2, text="Archiver:", variable=self.archiver, values=["tar", "bsdtar"])
        self.add_combobox(row=3, text="Compression:", variable=self.compression, values=["gzip", "xz"])
        self.add_entry(row=4, text="Additional archiver options:", variable=self.user_options)
        self.add_checkbutton(row=5, text="Exclude /home but keep hidden files and folders", variable=self.exclude_home)
        self.add_checkbutton(row=6, text="Don't keep /home 's hidden files and folders.", variable=self.no_hidden)

    def add_checkbutton(self, row, text, variable):
        check_button = ttk.Checkbutton(self, text=text, variable=variable)
        check_button.grid(row=row, column=1, columnspan=2, sticky="nsew")

    def add_choose_folder(self, row, text, variable):
        # create the widgets
        label = ttk.Label(self, text=text)
        entry = ttk.Entry(self, textvariable=variable, state="readonly")
        button = ttk.Button(self, text="...", command=lambda:variable.set(tkfiledialog.askdirectory()), width=2)
        # place the widgets
        label.grid(row=row, column=1, sticky="nse")
        entry.grid(row=row, column=2, sticky="nsew")
        button.grid(row=row, column=3)

    def add_combobox(self, row, text, variable, values):
        # create the widgets
        label = ttk.Label(self, text=text)
        box = ttk.Combobox(self, textvariable=variable, state="readonly", values=values)
        # place the widgets
        label.grid(row=row, column=1, sticky="nse")
        box.grid(row=row, column=2, sticky="nsew")

    def add_entry(self, row, text, variable):
        # create the widgets
        label = ttk.Label(self, text=text)
        entry = ttk.Entry(self, textvariable=variable)
        # place the widgets
        label.grid(row=row, column=1, sticky="nse")
        entry.grid(row=row, column=2, sticky="nsew")



def main():
    root = tk.Tk()
    root.title("backup.sh GUI")
    app = Example(root)
    app.update()
    root.minsize(root.winfo_width(), root.winfo_height())
    root.mainloop()


if __name__ == '__main__':
    main()