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# 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
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# KIND, either express or implied.  See the License for the
# specific language governing permissions and limitations
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from __future__ import annotations

import logging

from airflow.state import get_state_backend
from airflow.state.metastore import MetastoreBackend

log = logging.getLogger(__name__)

# Other state operations (list, get, delete per key) will be added here in the future.


def cleanup_task_state_store(args) -> None:
    """Remove expired task state store rows (MetastoreBackend only)."""
    backend = get_state_backend()

    if not isinstance(backend, MetastoreBackend):
        print("Custom backend configured — skipping cleanup (not supported).")
        return

    if args.dry_run:
        summary = backend._summary_dry_run()
        expired = summary["expired"]
        if not expired:
            print("Nothing to delete.")
            return
        print(f"Would delete {len(expired)} task state store row(s):\n")
        for dag_id, run_id, task_id, map_index, key in expired:
            print(f"  Dag {dag_id!r}, run {run_id!r}, task {task_id!r}, map_index {map_index!r}, key {key!r}")
        return

    log.info("Running task state store cleanup")
    backend.cleanup()
