"""
Copyright (c) Contributors to the Open 3D Engine Project.
For complete copyright and license terms please see the LICENSE at the root of this distribution.

SPDX-License-Identifier: Apache-2.0 OR MIT

Functions that repeatedly run until a condition is met
"""
import time


def wait_for(fn_act, timeout=30, exc=None, interval=1):
    """
    Continues to execute a given function until the function returns True. Raises an exception if the function does
    not return True before the timeout

    :param fn_act: The target function to execute
    :param timeout: The set amount of time before raising an exception
    :param exc: The exception to raise. An assertion error is raised by default
    :param interval: The time to wait between subsequent function calls
    """
    timeout_end = time.time() + timeout
    while not fn_act():
        if time.time() > timeout_end:
            if exc is not None:
                raise exc
            else:
                assert False, 'Timeout waiting for {}() after {}s.'.format(fn_act.__name__, timeout)
        time.sleep(interval)


def wait_while(fn_act, timeout, exc=None, interval=1):
    """
    Continues to execute a given function until the specified amount of time has passed. Raises an exception if the
    function does not return True during this time.

    :param fn_act: The target function to execute
    :param timeout: The set amount of time to wait
    :param exc: The exception to raise. An assertion error is raised by default
    :param interval: The time to wait between subsequent function calls
    """
    timeout_end = time.time() + timeout
    while time.time() < timeout_end:
        if not fn_act():
            if exc is not None:
                raise exc
            else:
                assert False, '{}() failed while waiting for {}s'.format(fn_act.__name__, timeout)
        time.sleep(interval)