import tkinter as tk
from os import getcwd as pwd
import csv

def tk_07():
    """Alter program 129 to add a third button that will save the list to a .csv
       file. The code 'tmp_list = num_list.get(0,"end")' can be used to save the
       contents of a list box as a tuple called tmp_list."""
    file_path = f"{pwd()}/tkgui/files/nums.csv"
    def add_num():
        num = txt_in_box.get()
        if num.isdigit():
            lst_nums.insert('end', num)
            txt_in_box.delete(0, 'end')
            txt_in_box.focus()
        else:
            txt_in_box.delete(0, 'end')
            txt_in_box.focus()

    def reset():
        txt_in_box.delete(0, 'end')
        lst_nums.delete(0, 'end')
        txt_in_box.focus()

    def save_csv():
        tmp_lst = lst_nums.get(0, 'end')
        with open(file_path, 'a+') as file:
            item = 0
            for _ in tmp_lst:
                new_num = tmp_lst[item]+'\n'
                file.write(str(new_num))
                item += 1
            path_csv = f"Ruta: {file_path}"
            lbl_file["state"] = "normal"
            lbl_file.delete(0, 'end')
            lbl_file.insert(0, path_csv)
            lbl_file["state"] = "readonly"

    window = tk.Tk()
    window.title("Lista de números TK")
    window.geometry("600x240")

    lbl_info = tk.Label(text="Ingresa un número: ")
    lbl_info.place(x=40, y=25, width=150, height=35)

    txt_in_box = tk.Entry()
    txt_in_box["justify"] = "center"
    txt_in_box.place(x=180, y=25, width=150, height=35)
    txt_in_box.focus()

    btn_add = tk.Button(text="Agregar", command=add_num)
    btn_add.place(x=40, y=75, width=300, height=50)
    btn_reset = tk.Button(text="Vaciar", command=reset)
    btn_reset.place(x=40, y=130, width=140, height=50)
    btn_save = tk.Button(text="Guardar", command=save_csv)
    btn_save.place(x=200, y=130, width=140, height=50)

    lst_nums = tk.Listbox()
    lst_nums["justify"] = "center"
    lst_nums.place(x=350, y=25, width=220, height=160)
    
    lbl_file = tk.Entry()
    lbl_file["state"] = "readonly"
    lbl_file["justify"] = "center"
    lbl_file["width"] = 580
    lbl_file.place(x=10, y=190, width=580, height=35)

    window.mainloop()