def save_dict_to_file(dic):
    f = open('dict.txt', 'w')
    f.write(str(dic))
    f.close()


def load_dict_from_file():
    f = open('dict.txt', 'r')
    data = f.read()
    f.close()
    return eval(data)


def open_or_loading():

    print('nnHello to Movies.basenn'
          'Do you want to load an existent database or create a new one?nn'
          'Choose 1 for loading an existent.n'
          'Choose 2 for create a new database.n')
    user_answer = input('Option: ')

    if user_answer == '1':
        database = load_dict_from_file()

    elif user_answer == '2':
        database = {}
        save_dict_to_file(database)
    else:
        print('Wrong option, try again.n')
        open_or_loading()


    def view_all_list():
        for key, value in database.items():
            print(key, value)



    def add_movie():

        last_inserted = (len(database))
        movie_name = input('What is the name of the movie: ')

        def year_movie():
            try:
                movie_year = int(input('Released in year: '))
            except:
                print('You must insert a year format: e.g.: 2018')
                year_movie()
            else:
                if movie_year < 1000 or movie_year > 9999:
                    print('You must insert a year format: e.g.: 2018')
                    year_movie()
                else:
                    return movie_year
        movie_year = year_movie()
        movie_director = input('Directed by: ')

        def category_movie():

            print('Choose one category:nn'
                  '1 - Actionn'
                  '2 - Adventuren'
                  '3 - Avant-garde / Experimentaln'
                  '4 - Comedyn'
                  '5 - Comedy-Draman'
                  '6 - Crimen'
                  '7 - Draman'
                  '8 - Epicn'
                  '9 - Family-Childrenn'
                  '10 - Fantasyn'
                  '11 - Historical-Filmn'
                  '12 - Horrorn'
                  '13 - Musicaln'
                  '14 - Mysteryn'
                  '15 - Romancen'
                  '16 - Sci-Fi / Science-Fictionn'
                  '17 - Spy Filmn'
                  '18 - Thrillern'
                  '19 - Warn'
                  '20 - Westernn'
                  '21 - Adultn')

            category = int(input('Category: '))

            def switch_demo(argument):
                switcher = {
                    1: 'Action',
                    2: 'Adventure',
                    3: 'Avant-garde / Experimental',
                    4: 'Comedy',
                    5: 'Comedy-Drama',
                    6: 'Crime',
                    7: 'Drama',
                    8: 'Epic',
                    9: 'Family-Children',
                    10: 'Fantasy',
                    11: 'Historical-Film',
                    12: 'Horror',
                    13: 'Musical',
                    14: 'Mystery',
                    15: 'Romance',
                    16: 'Sci-Fi / Science-Fiction',
                    17: 'Spy Film',
                    18: 'Thriller',
                    19: 'War',
                    20: 'Western',
                    21: 'Adult'
                }
                return switcher.get(category)

            if category < 1 or category > 21:
                print('nInvalid Categoryn')
                category_movie()
                switch_demo(category)

            else:
                return switch_demo(category)

        movie_category = category_movie()

        database[last_inserted + 1] = {}
        database[last_inserted + 1]['Movie Name'] = movie_name.upper()
        database[last_inserted + 1]['Movie Year'] = movie_year
        database[last_inserted + 1]['Director Name'] = movie_director.upper()
        database[last_inserted + 1]['Movie Category'] = movie_category

        save_dict_to_file(database)

        print(f'nMovie {movie_name} added to databasen')

        menu_initial()


    def menu_initial():
        print('nnChose one option:nn'
              'Select 1 to view the movies list.n'
              'Select 2 to add a new movie.n'
              'Select 3 to find a movie.n'
              'Select 4 to delete a movie.n'
              'Select 5 to exit outn')
        user_selection = (input('Option: '))

        if user_selection == '1':
            view_all_list()
            menu_initial()
        elif user_selection == '2':
            add_movie()
            menu_initial()
        elif user_selection == '3':
            print('Finding')
            menu_initial()
        elif user_selection == '4':
            print('deleting')
            menu_initial()
        elif user_selection == '5':
            print('Thanks for using Movie.Base. Bye-bye!')
            exit()
        else:
            print('Option do not exist')
            menu_initial()

    menu_initial()

open_or_loading()

def year_movie():
        try:
            movie_year = int(input('Released in year: '))
        except:
            print('You must insert a year format: e.g.: 2018')
            return year_movie() ## return from recursive call
        else:
            if movie_year < 1000 or movie_year > 9999:
                print('You must insert a year format: e.g.: 2018')
                return year_movie() ## return from recursive call
            else:
                return movie_year