# Copyright 2016 Julien Danjou
# Copyright 2016 Joshua Harlow
# Copyright 2013-2014 Ray Holder
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.


def stop_never(previous_attempt_number, delay_since_first_attempt):
    """Stop strategy that never stops."""
    return False


class stop_after_attempt(object):
    "Stop strategy that stops when the previous attempt >= max_attempt."

    def __init__(self, max_attempt_number):
        self.max_attempt_number = max_attempt_number

    def __call__(self, previous_attempt_number, delay_since_first_attempt):
        return previous_attempt_number >= self.max_attempt_number


class stop_after_delay(object):
    "Stop strategy that stops when the time from the first attempt >= limit."

    def __init__(self, max_delay):
        self.max_delay = max_delay

    def __call__(self, previous_attempt_number, delay_since_first_attempt):
        return delay_since_first_attempt >= self.max_delay