from tkinter import *
from functools import partial
from datetime import date
import all_constants as c


class HistoryExport:
    # displays history and export dialogue box

    def __init__(self, partner, calculations):
        self.history_box = Toplevel()

        partner.to_history_button.config(state=DISABLED)

        self.history_box.protocol("WM_DELETE_WINDOW",
                                  partial(self.close_history, partner))

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

        recent_intro_txt = "Below are all your calculations."

        newest_first_string = ""
        newest_first_list = list(reversed(calculations))

        for item in newest_first_list[:-1]:
            newest_first_string += item + "\n"
        newest_first_string += newest_first_list[-1]

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

        history_labels_list = [
            ["History / Export", ("Arial", "16", "bold"), None],
            [recent_intro_txt, ("Arial", "11"), None],
            [newest_first_string, ("Arial", "14"), None],
            [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",
                               pady=10,
                               padx=20)
            make_label.grid(row=count)
            history_label_ref.append(make_label)

        self.export_filename_label = history_label_ref[3]

        self.hist_button_frame = Frame(self.history_box)
        self.hist_button_frame.grid(row=4)

        button_details_list = [
            ["Export", "#004C99",
             lambda: self.export_date(calculations), 0, 0],
            ["Close", "#666666",
             partial(self.close_history, partner), 0, 1]
        ]

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

    def export_date(self, calculations):
        # exports history to a dated text file
        today = date.today()
        day = today.strftime("%d")
        month = today.strftime("%m")
        year = today.strftime("%Y")

        file_name = f"currency_{year}_{month}_{day}"

        success_string = (f"Export Successful! The file is called "
                          f"{file_name}.txt")
        self.export_filename_label.config(bg="#00990",
                                          text=success_string)

        write_to = f"{file_name}.txt"
        with open(write_to, "w") as text_file:
            text_file.write("**** Currency Calculations ****\n")
            text_file.write(f"Generated: {day}/{month}/{year}\n\n")
            text_file.write("Here is your calculation history "
                            "(oldest to newest)...\n")
            for item in calculations:
                text_file.write(item)
                text_file.write("\n")

    def close_history(self, partner):
        # closes history window and re-enables history button
        partner.to_history_button.config(state=NORMAL)
        self.history_box.destroy()