# ========= 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. =========

from mirage.accessor.s3 import S3Accessor
from mirage.core.s3._client import _client_kwargs, _prefix, async_session
from mirage.types import PathSpec


async def du(accessor: S3Accessor, path: PathSpec) -> int:
    """Total size in bytes under a prefix.

    Args:
        accessor (S3Accessor): S3 accessor.
        path (PathSpec | str): Prefix path.
    """
    if isinstance(path, str):
        path = PathSpec(original=path, directory=path)
    if isinstance(path, PathSpec):
        path = path.strip_prefix
    config = accessor.config
    pfx = _prefix(path)
    total = 0
    session = async_session(config)
    async with session.client(**_client_kwargs(config)) as client:
        paginator = client.get_paginator("list_objects_v2")
        async for page in paginator.paginate(Bucket=config.bucket, Prefix=pfx):
            for obj in page.get("Contents") or []:
                total += obj.get("Size", 0)
    return total


async def du_all(accessor: S3Accessor,
                 path: PathSpec) -> list[tuple[str, int]]:
    """List of (path, size) tuples plus a total entry.

    Args:
        accessor (S3Accessor): S3 accessor.
        path (PathSpec | str): Prefix path.
    """
    if isinstance(path, str):
        path = PathSpec(original=path, directory=path)
    if isinstance(path, PathSpec):
        path = path.strip_prefix
    config = accessor.config
    pfx = _prefix(path)
    results: list[tuple[str, int]] = []
    total = 0
    session = async_session(config)
    async with session.client(**_client_kwargs(config)) as client:
        paginator = client.get_paginator("list_objects_v2")
        async for page in paginator.paginate(Bucket=config.bucket, Prefix=pfx):
            for obj in page.get("Contents") or []:
                sz = obj.get("Size", 0)
                key = obj["Key"]
                entry = "/" + key.lstrip("/")
                results.append((entry, sz))
                total += sz
    results.append((path, total))
    return results
