# ========= 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.base import Accessor
from mirage.commands.builtin.generic_bind.adapter import (Builder, CommandIO,
                                                          Operation)
from mirage.commands.config import CommandOpts
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
from mirage.utils.errors import FS_ERRORS, fs_strerror


async def touch(ops: CommandIO, accessor: Accessor, paths: list[PathSpec],
                texts: list[str],
                opts: CommandOpts) -> tuple[ByteSource | None, IOResult]:
    c = FlagView(opts.flags, spec=SPECS["touch"]).as_bool("c")
    if not ops.is_mounted(accessor) or not paths:
        raise ValueError("touch: missing operand")
    paths = await ops.resolve_glob(accessor, paths, opts.index)
    exists = ops.require(Operation.EXISTS)
    write = ops.require(Operation.WRITE)
    created: dict[str, ByteSource] = {}
    errors: list[str] = []
    for p in paths:
        if c:
            continue
        if await exists(accessor, p):
            continue
        try:
            await write(accessor, p, b"")
        except FS_ERRORS as exc:
            # One unusable operand is not an aborted command: GNU reports
            # it and still touches the remaining ones.
            errors.append(f"touch: cannot touch '{p.virtual}': "
                          f"{fs_strerror(exc)}")
            continue
        created[p.mount_path] = b""
    stderr = ("\n".join(errors) + "\n").encode() if errors else None
    return None, IOResult(writes=created,
                          stderr=stderr,
                          exit_code=1 if errors else 0)


BUILDER = Builder('touch',
                  touch,
                  write=True,
                  requirements=frozenset({Operation.EXISTS, Operation.WRITE}))
