from tkinter import *
from functools import partial  # to prevent unwanted windows


class Converter:

    def __init__(self):
        self.temp_frame = Frame(padx=10, pady=10)
        self.temp_frame.grid()

        self.to_history_button = Button(self.temp_frame, text="History / Export", bg="#CC6600",
                                        fg="#FFFFFF", font=("Arial", "14", "bold"), width=12,
                                        command=self.to_history)
        self.to_history_button.grid(row=1, padx=5, pady=5)

    def to_history(self):
        """
        Opens history dialogue box and disables history button
        (so that users can't create multiple history boxes)
        """
        HistoryExport(self)


class HistoryExport:
    """
    Displays history dialogue box
    """

    def __init__(self, partner):
        # setup dialogue box and background colour

        green_black = "#D5E8D4"
        peach_black = "#ffe6cc"

        self.history_box = Toplevel()

        # disable history button
        partner.to_history_button.config(state=DISABLED)

        # if users press cross at top, close history
        # and 'releases' history button
        self.history_box.protocol('WM_DELETE_WINDOW', partial(self.close_history, partner))

        self.history_frame = Frame(self.history_box)
        self.history_frame.grid()

        # strings for long labels
        recent_intro_txt = ("Below are your recent calculations - showing 3 / 3 calculations."
                            "All calculations are shown to the nearest degree")

        export_instruction_txt = ("Please push <Export> to save your calculations in a file"
                                  "If the filename already exists, it will be replaced")

        calculations = ""

        # Label list (label text | format | bg)
        history_labels_list = [
            ["History / Export", ("Arial", "16", "bold"), None],
            [recent_intro_txt, ("Arial", "11"), None],
            ["calculation list", ("Arial", "14"), green_black],
            [export_instruction_txt, ("Arial", "11"), None]
        ]

        history_label_ref = []
        for count, item in enumerate(history_labels_list):
            make_label = Label(self.history_box, text=item[0], font=item[1], bg=item[2],
                               wraplength=300, justify="left", padx=10, pady=20)
            make_label.grid(row=count)

            history_label_ref.append(make_label)

        # retrieve export instruction label so that we can configure it to show
        # the filename if the user exports the file
        self.export_filename_label = history_label_ref[3]

        # make frame to hold buttons (two columns)
        self.hist_button_frame = Frame(self.history_box)
        self.hist_button_frame.grid(row=4)

        button_ref_list = []

        # button list
        button_details_list = [
            ["Export", '#004C99', "", 0, 0],
            ["Close", "#666666", partial(self.close_history, partner), 0, 1]
        ]

        for btn in button_details_list:
            self.make_button = Button(self.hist_button_frame, font=("Arial", "12", "bold"),
                                      text=btn[0], bg=btn[1], fg="#FFFFFF", width=12, command=btn[2])
            self.make_button.grid(row=btn[3], column=btn[4], padx=10, pady=10)

    def close_history(self, partner):

        # Put history button back to normal
        partner.to_history_button.config(state=NORMAL)
        self.history_box.destroy()


# main routine