# ========= Copyright 2026 @ Strukto.AI All Rights Reserved. =========
# 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.
# ========= Copyright 2026 @ Strukto.AI All Rights Reserved. =========

import time

from mirage.accessor.redis import RedisAccessor
from mirage.cache.context import invalidate_after_write
from mirage.core.timeutil import now_iso
from mirage.observe.context import record
from mirage.types import PathSpec
from mirage.utils.path import norm


async def truncate(accessor: RedisAccessor, path: PathSpec,
                   length: int) -> None:
    store = accessor.store
    start_ms = int(time.monotonic() * 1000)
    p = norm(path.mount_path)
    data = await store.get_file(p)
    if data is None:
        data = b""
    await store.set_file(p, data[:length].ljust(length, b"\0"))
    await store.set_modified(p, now_iso())
    record("truncate", path.mount_path, "redis", 0, start_ms)
    await invalidate_after_write(path)
