"""
This program is free software: you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License,
or (at your option) any later version.


This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
See the GNU General Public License for more details.


You should have received a copy of the GNU General Public License
 along with this program.  If not, see <https://www.gnu.org/licenses/>.

Copyright © 2019 Cloud Linux Software Inc.

This software is also available under ImunifyAV commercial license,
see <https://www.imunify360.com/legal/eula>
"""
import hashlib
import logging
import os
from contextlib import ExitStack
from pathlib import Path
import tempfile

from defence360agent import utils
from defence360agent.contracts.config import Core
from defence360agent.contracts.messages import MessageType
from defence360agent.contracts.plugins import MessageSink, expect
from defence360agent.utils import Scope, is_cluster
from imav.malwarelib.utils import malware_response


from imav.malwarelib.cleanup.storage import resolve_file_for_upload_k8s

logger = logging.getLogger(__name__)


class ServerPullFileSender(MessageSink):
    SCOPE = Scope.IM360
    loop = None

    async def create_sink(self, loop):
        self.loop = loop

    async def _upload_file_k8s(self, file: str, reason: str) -> None:
        """Upload file in k8s environment."""
        async with resolve_file_for_upload_k8s(file) as upload_paths:
            if not upload_paths:
                logger.warning(
                    "Skipping MRS upload for %s - file not available",
                    file,
                )
                return

            for upload_path in upload_paths:
                if os.path.isdir(upload_path):
                    logger.warning(
                        "Skipping MRS upload for %s - directories are not"
                        " supported",
                        file,
                    )
                    continue

                upload_file = malware_response.MalwareHitPath(
                    upload_path, file
                )
                await malware_response.upload_file(
                    upload_file, upload_reason=reason
                )

    async def _upload_file(self, file: str, reason: str) -> None:
        """Upload file in non-k8s environment."""
        with ExitStack() as stack:
            # Save directory contents into tempfile and upload it to MRS
            if os.path.isdir(file):
                tf = stack.enter_context(
                    tempfile.NamedTemporaryFile(dir=Core.TMPDIR)
                )
                tf.write(await utils.check_run(["ls", "-al", file]))
                tf.seek(0)
                # Use original file path as the "real path" for MRS
                file = malware_response.MalwareHitPath(tf.name, file)
                hash_ = hashlib.sha256(Path(tf.name).read_bytes()).hexdigest()
                logger.info(
                    "Uploading temporary file %s with hash: %s",
                    tf.name,
                    hash_,
                )

            await malware_response.upload_file(file, upload_reason=reason)

    @expect(MessageType.MalwareSendFiles)
    async def upload_files(self, message):
        reason = message["reason"]
        for file in message["files"]:
            try:
                if is_cluster():
                    await self._upload_file_k8s(file, reason)
                else:
                    await self._upload_file(file, reason)
            except Exception as e:
                logger.warning(str(e))