from typing import Dict
import re
import random

commands: Dict = {}


def command(*commandlist):
    def add_command(function):
        for command in commandlist:
            commands[command] = function
        return function
    return add_command


def handle_command(kwargs):
    c = kwargs['message'].split()[0]
    params = kwargs['message'].replace(c, '').strip()

    if c in commands:
        commands[c](kwargs, params)
    else:
        error_response(kwargs, params)


@command('/roll')
def custom_roll(kwargs, params):
    pattern = re.compile('(?P<dice_num>(?:\+|\-)?\d+)(?i:d)(?P<dice_val>\d+)(?P<maths>(?:(?:\+|\-)\d+)*(?!(?i:d)))')
    rolls = re.findall(pattern, params)
    print(f'/roll received {kwargs}. Roll parameters: {params}. Rolls recognized: {rolls}')


def error_response(kwargs, params):
    print(f'Error, received unknown command: {kwargs}')