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# regarding copyright ownership.  The ASF licenses this file
# to you 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
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# specific language governing permissions and limitations
# under the License.

class VideoGroupRollingPolicy:
    """Tracks deferred rolling at physical-video group boundaries."""

    def __init__(self):
        self.current_group = None
        self.pending_roll = False

    def should_roll_before(self, next_group) -> bool:
        return self.pending_roll and self.current_group != next_group

    def record(self, group) -> None:
        self.current_group = group

    def defer_roll(self) -> bool:
        if self.current_group is None:
            return False
        self.pending_roll = True
        return True

    def reset(self) -> None:
        self.current_group = None
        self.pending_roll = False