# ========= 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 asyncssh

from mirage.accessor.ssh import SSHAccessor
from mirage.cache.context import invalidate_subtree
from mirage.core.ssh.client import _abs
from mirage.types import PathSpec


async def rm_r(accessor: SSHAccessor, path_spec: PathSpec) -> None:
    path = path_spec.mount_path
    config = accessor.config
    sftp = await accessor.sftp()
    try:
        await _rm_r_inner(sftp, config, path)
    except asyncssh.SFTPNoSuchFile:
        raise FileNotFoundError(path)
    await invalidate_subtree(path_spec)


async def _rm_r_inner(sftp, config, path: str) -> None:
    remote = _abs(config, path)
    # lstat, not stat: rm never follows symlinks (a link to a directory
    # must be unlinked, not recursed into), and a dangling link is still
    # removable. Mirrors the TS core, which already uses lstat here.
    attrs = await sftp.lstat(remote)
    if attrs.type == asyncssh.FILEXFER_TYPE_DIRECTORY:
        entries = await sftp.readdir(remote)
        for entry in entries:
            if entry.filename in (".", ".."):
                continue
            child = f"{path.rstrip('/')}/{entry.filename}"
            await _rm_r_inner(sftp, config, child)
        await sftp.rmdir(remote)
    else:
        await sftp.remove(remote)
