import datetime

from forex_python.converter import CurrencyCodes, CurrencyRates

HISTORY_PATH = "history.txt"


def get_valuta(codes, msg):
    while True:
        print(msg)
        data = input()

        simbol = codes.get_symbol(data)
        if simbol is not None:
            return data

        print('Invalid valuta')


def get_date():
    print('choose date (default today)')
    data = input()
    if not data:
        return None

    while True:
        print('write date in format %YYYY-%MM-%DD')
        data = input()
        try:
            d = datetime.datetime.strptime(data, '%Y-%m-%d')
            return d
        except Exception:
            print('Invalid date format')


def get_money():
    print('how much money?')
    while True:
        data = input()
        try:
            money = float(data)
            return money
        except Exception:
            print('Invalid number')


def convert():
    rates = CurrencyRates()
    codes = CurrencyCodes()

    name_from = get_valuta(codes, 'write valuta from')
    name_to = get_valuta(codes, 'write valuta to')
    date = get_date()
    money = get_money()
    rate = rates.get_rate(name_from, name_to)

    res = rates.convert(
        base_cur=name_from,
        dest_cur=name_to,
        amount=money,
        date_obj=date
    )
    msg = f'Конвертировал {money} {name_from} в {name_to} по курсу {rate} и получил {res} {name_to}'
    with open(HISTORY_PATH, 'a') as f:
        f.write(msg)

    print(msg)


def get_history():
    print('-----History-----')
    try:
        with open(HISTORY_PATH) as f:
            for line in f:
                line = line.rstrip()
                print(line)
        print('-----------------')
    except IOError:
        print(f'Can not open file {HISTORY_PATH}, m/b history is empty')


def main():
    info = '''
    There are 2 commands:
    1) convert
    2) history

    Choose one
    '''

    while True:
        print(info)
        cmd = input()

        if cmd == 'convert':
            convert()
            continue
        elif cmd == 'history':
            get_history()
            continue

        print('Invalid command')


main()