# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements.  See the NOTICE file
# distributed with this work for additional information
# 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
# KIND, either express or implied.  See the License for the
# specific language governing permissions and limitations
# under the License.

import itertools

from core.architecture.handlers.control.control_handler_base import ControlHandler
from core.architecture.managers.pause_manager import PauseType
from proto.org.apache.texera.amber.engine.architecture.rpc import (
    EmptyReturn,
    EmptyRequest,
)
from proto.org.apache.texera.amber.engine.architecture.worker import (
    WorkerState,
)


class RetryCurrentTupleHandler(ControlHandler):
    async def retry_current_tuple(self, req: EmptyRequest) -> EmptyReturn:
        if not self.context.state_manager.confirm_state(WorkerState.COMPLETED):
            # chain the current input tuple back on top of the current iterator to
            # be processed once more
            self.context.tuple_processing_manager.current_input_tuple_iter = (
                itertools.chain(
                    [self.context.tuple_processing_manager.current_input_tuple],
                    self.context.tuple_processing_manager.current_input_tuple_iter,
                )
            )
            self.context.pause_manager.resume(PauseType.USER_PAUSE)
            self.context.pause_manager.resume(PauseType.EXCEPTION_PAUSE)
        return EmptyReturn()
