import functools
import random
import time

from module.logger import logger as logging_logger

try:
    from decorator import decorator
except ImportError:
    def decorator(caller):
        """ Turns caller into a decorator.
        Unlike decorator module, function signature is not preserved.

        :param caller: caller(f, *args, **kwargs)
        """

        def decor(f):
            @functools.wraps(f)
            def wrapper(*args, **kwargs):
                return caller(f, *args, **kwargs)

            return wrapper

        return decor


def __retry_internal(f, exceptions=Exception, tries=-1, delay=0, max_delay=None, backoff=1, jitter=0,
                     logger=logging_logger):
    """
    Executes a function and retries it if it failed.

    :param f: the function to execute.
    :param exceptions: an exception or a tuple of exceptions to catch. default: Exception.
    :param tries: the maximum number of attempts. default: -1 (infinite).
    :param delay: initial delay between attempts. default: 0.
    :param max_delay: the maximum value of delay. default: None (no limit).
    :param backoff: multiplier applied to delay between attempts. default: 1 (no backoff).
    :param jitter: extra seconds added to delay between attempts. default: 0.
                   fixed if a number, random if a range tuple (min, max)
    :param logger: logger.warning(fmt, error, delay) will be called on failed attempts.
                   default: retry.logging_logger. if None, logging is disabled.
    :returns: the result of the f function.
    """
    _tries, _delay = tries, delay
    while _tries:
        try:
            return f()
        except exceptions as e:
            _tries -= 1
            if not _tries:
                # Difference, raise same exception
                raise e

            if logger is not None:
                # Difference, show exception
                logger.exception(e)
                logger.warning(f'{type(e).__name__}({e}), retrying in {_delay} seconds...')

            time.sleep(_delay)
            _delay *= backoff

            if isinstance(jitter, tuple):
                _delay += random.uniform(*jitter)
            else:
                _delay += jitter

            if max_delay is not None:
                _delay = min(_delay, max_delay)


def retry(exceptions=Exception, tries=-1, delay=0, max_delay=None, backoff=1, jitter=0, logger=logging_logger):
    """Returns a retry decorator.

    :param exceptions: an exception or a tuple of exceptions to catch. default: Exception.
    :param tries: the maximum number of attempts. default: -1 (infinite).
    :param delay: initial delay between attempts. default: 0.
    :param max_delay: the maximum value of delay. default: None (no limit).
    :param backoff: multiplier applied to delay between attempts. default: 1 (no backoff).
    :param jitter: extra seconds added to delay between attempts. default: 0.
                   fixed if a number, random if a range tuple (min, max)
    :param logger: logger.warning(fmt, error, delay) will be called on failed attempts.
                   default: retry.logging_logger. if None, logging is disabled.
    :returns: a retry decorator.
    """

    @decorator
    def retry_decorator(f, *fargs, **fkwargs):
        args = fargs if fargs else list()
        kwargs = fkwargs if fkwargs else dict()
        return __retry_internal(functools.partial(f, *args, **kwargs), exceptions, tries, delay, max_delay, backoff,
                                jitter,
                                logger)

    return retry_decorator
