# ========= 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 collections.abc import Callable
from typing import Any

from mirage.accessor.base import Accessor
from mirage.commands.builtin.generic_bind.adapter import CommandIO, Operation
from mirage.commands.config import CommandOpts
from mirage.commands.registry import command
from mirage.commands.spec import SPECS
from mirage.commands.spec.types import FlagView
from mirage.io.types import ByteSource, IOResult
from mirage.types import PathSpec


def make_touch(resource: str, io: CommandIO) -> Callable[..., Any]:
    """Build the create-if-missing touch override for one keyed store.

    Args:
        resource (str): resource name the command registers under.
        io (CommandIO): the backend's op table; must wire exists and
            write.
    """
    exists = io.require(Operation.EXISTS)
    write_bytes = io.require(Operation.WRITE)
    resolve_glob = io.resolve_glob

    async def touch(
        accessor: Accessor,
        paths: list[PathSpec],
        texts: list[str],
        opts: CommandOpts,
    ) -> tuple[ByteSource | None, IOResult]:
        if not paths:
            raise ValueError("touch: missing operand")
        fl = FlagView(opts.flags, spec=SPECS["touch"])
        paths = await resolve_glob(accessor, paths, opts.index)
        writes: dict[str, ByteSource] = {}
        for p in paths:
            if fl.as_bool("c"):
                continue
            if not await exists(accessor, p):
                await write_bytes(accessor, p, b"")
                writes[p.mount_path] = b""
        return None, IOResult(writes=writes)

    wrapped: Callable[..., Any] = command("touch",
                                          resource=resource,
                                          spec=SPECS["touch"],
                                          write=True)(touch)
    return wrapped
