from tkinter import *
from tkinter import ttk
from functools import partial  # To prevent unwanted windows


class Converter:
    def __init__(self):

        self.base_frame = Frame(padx=10, pady=10)
        self.base_frame.grid()

        self.to_settings_button = Button(self.base_frame,
                                         text="Settings",
                                         bg="#0492C2",
                                         # fg determines the text colour
                                         fg="#FFFFFF",
                                         font=("Arial", "14", "bold"), width=12,
                                         command=self.to_help)
        self.to_settings_button.grid(row=1, padx=5, pady=5)

    def to_help(self):
        """
        Opens help dialogue box and disables help button
        (so that users can't create multiple help boxes).
        """
        DisplaySettings(self)


class DisplaySettings:
    def __init__(self, partner):
        # setup dialogue box and background colour
        background = "#ffe6cc"
        self.settings_box = Toplevel()

        # disable button
        partner.to_settings_button.config(state=DISABLED)

        self.settings_box.protocol('WM_DELETE_WINDOW',
                                   partial(self.close_help, partner))

        self.settings_frame = Frame(self.settings_box, width=300,
                                    height=200)
        self.settings_frame.grid()

        self.settings_heading_label = Label(self.settings_frame,
                                            text="Settings",
                                            font=("Arial", "14", "bold"))
        self.settings_heading_label.grid(row=0)

        self.settings_input_frame = Frame(self.settings_frame, width=300,
                                          height=200)
        self.settings_input_frame.grid(row=1)

        # this stuff is inside settings_input_frame
        self.settings_text_label = Label(self.settings_input_frame,
                                         text="A",
                                         justify="left",
                                         bg=background)
        self.settings_text_label.grid(column=0, row=0, padx=10)

        self.settings_text_combo = ttk.Combobox(self.settings_input_frame,
                                                values=["1", "2"],
                                                justify="left")
        self.settings_text_combo.grid(column=1, row=0, padx=10)

        self.dismiss_button = Button(self.settings_frame,
                                     font=("Arial", "12", "bold"),
                                     text="Dismiss", bg="#CC6600",
                                     fg="#FFFFFF",
                                     command=partial(self.close_help, partner))
        self.dismiss_button.grid(row=2, padx=10, pady=10)

        # List and loop to set background colour on
        # everything except the buttons.
        recolour_list = [self.settings_frame, self.settings_heading_label, self.settings_input_frame]

        for item in recolour_list:
            item.config(bg=background)

    def close_help(self, partner):
        partner.to_settings_button.config(state=NORMAL)
        self.settings_box.destroy()


if __name__ == "__main__":
    root = Tk()
    root.title("Currency Converter")
    Converter()
    root.mainloop()