import tkinter as tk
import tkinter.ttk as ttk
from tkinter import filedialog

import validators

class StatusPanel(tk.Frame):

    def __init__(self, parent):
        tk.Frame.__init__(self, parent.master)
        self._parent = parent
        self.label = tk.Label(self, bd=1, relief=tk.SUNKEN, anchor=tk.S)
        self.label.pack(fill=tk.X)
        self.pack(side=tk.BOTTOM, fill=tk.X)

    def set_text(self, text):
        self.label.config(text=text)
        self.label.update_idletasks()

    def clear_text(self):
        self.set_text('')


class FilePanel(tk.Frame):

    def __init__(self, parent):
        tk.Frame.__init__(self, parent.master)
        self._parent = parent
        self.btn_files = tk.Button(self, text="Select Files", command=self._parent.select_files)
        self.btn_files.pack(pady=5, padx=5)
        self.label = tk.Label(self, anchor=tk.SW)
        self.label.pack(fill=tk.X, pady=5, padx=5)
        ttk.Separator(self, orient=tk.HORIZONTAL).pack(side=tk.BOTTOM, fill=tk.X)
        self.pack(side=tk.TOP, fill=tk.X)

    def set_text(self, text):
        self.label.config(text=text)
        self.label.update_idletasks()

    def clear_text(self):
        self.set_text('')


class FieldPanel(tk.Frame):

    def __init__(self, parent):
        tk.Frame.__init__(self, parent.master)
        self._parent = parent
        self.is_single = tk.BooleanVar()
        self.is_single.set(True)
        self.rbtn_single = tk.Radiobutton(self, text='single excel files', variable=self.is_single, value=True, command=self.disable_listbox)
        self.rbtn_combine = tk.Radiobutton(self, text='one combined excel file', variable=self.is_single, value=False, command=self.enable_listbox)
        self.rbtn_single.pack(anchor=tk.W)
        self.rbtn_combine.pack(anchor=tk.W)
        self.listbox = tk.Listbox(self, selectmode=tk.MULTIPLE, activestyle='none')
        self.listbox.pack(fill=tk.X, ipady=5, ipadx=5)
        self.pack(side=tk.TOP, fill=tk.X)

    def disable_radio_btn(self):
        self.rbtn_single.config(state="disabled")
        self.rbtn_combine.config(state="disabled")

    def disable_listbox(self):
        self.listbox.config(state="disabled")

    def disable(self):
        self.disable_listbox()
        self.disable_radio_btn()

    def enable_radio_btn(self):
        self.rbtn_single.config(state="normal")
        self.rbtn_combine.config(state="normal")
        self.is_single.set(True)

    def enable_listbox(self):
        self.listbox.config(state="normal")

    def enable(self):
        self.enable_listbox()
        self.enable_radio_btn()

    def set_listbox_content(self, choices, selection):
        self.enable_listbox()
        current = self.listbox.size()
        self.listbox.selection_clear(0, current)
        self.listbox.delete(0,current)
        for i, element in enumerate(choices):
            self.listbox.insert(tk.END, element)
            if element in selection:
                self.listbox.selection_set(i)
        self.disable_listbox()



class ActionPanel(tk.Frame):

    def __init__(self, parent):
        tk.Frame.__init__(self, parent.master)
        self._parent = parent
        self.btn_go = tk.Button(self, text="GO!", command=self._parent.quit)
        self.btn_go.pack(side=tk.LEFT, pady=5, padx=5)
        self.btn_quit = tk.Button(self, text="Quit", command=self._parent.quit)
        self.btn_quit.pack(side=tk.RIGHT, pady=5, padx=5)
        self.pack(side=tk.BOTTOM, fill=tk.X)

    def disable(self):
        self.btn_go.config(state='disabled')

    def enable(self):
        self.btn_go.config(state='active')


class Application(tk.Frame):

    def __init__(self, master):
        master.minsize(height=330, width=200)
        tk.Frame.__init__(self, master)
        self._master = master
        self.pack(fill=tk.BOTH)
        self.status_panel = StatusPanel(self)
        self.file_panel = FilePanel(self)
        self.field_panel = FieldPanel(self)
        self.action_panel = ActionPanel(self)
        self.reset()

    def reset(self):
        self.field_panel.disable()
        self.action_panel.disable()
        self.file_validator = None
        self.validated_files = None

    def select_files(self):
        self.reset()
        self.file_panel.clear_text()
        opts = {
            'initialdir': '~/_signalyse test',
            'filetypes': [('Signalyse Statistics', '.stx'), ('Signalyse Data', '.dat'), ('Sensovation Data', '.csv')],
            'multiple': True}
        file_selection = tk.filedialog.askopenfilename(**opts)
        if not isinstance(file_selection, tuple) or len(file_selection) == 0:
            return
        self.file_validator = validators.guess_validator(file_selection)
        if self.file_validator is None:
            return
        self.validated_files = [f for f in validators.validate_files(file_selection, self.file_validator)]
        status = '%d of %d valid %s files found' % (len(self.validated_files), len(file_selection), self.file_validator.type)
        self.file_panel.set_text(status)
        if len(self.validated_files) == 0:
            self.reset()
            return
        self.field_panel.enable_radio_btn()
        self.field_panel.set_listbox_content(self.file_validator.data_fields, self.file_validator.defaults)



    def quit(self):
        self._master.destroy()