"""
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 asyncio
from logging import getLogger
from typing import TYPE_CHECKING, Any

from defence360agent.contracts.messages import MessageType
from defence360agent.contracts.plugins import (
    MessageSink,
    MessageSource,
    expect,
)
from defence360agent.utils import Scope
from imav.contracts.imunify_patch_id import (
    get_imunify_patch_id,
)
from imav.contracts.messages import VulnerabilityPatchTask
from imav.malwarelib.api.imunify_patch_subscription import (
    ImunifyPatchSubscriptionAPI,
)
from imav.malwarelib.config import VulnerabilityHitStatus
from imav.malwarelib.model import ImunifyPatchSubscription, VulnerabilityHit
from imav.malwarelib.utils import user_list

if TYPE_CHECKING:
    from imav.contracts.imunify_patch_id import ImunifyPatchUserId
    from imav.contracts.messages import RefreshImunifyPatchSubscription

logger = getLogger(__name__)


class ImunifyPatchSubscriptionPlugin(MessageSink, MessageSource):
    SCOPE = Scope.AV

    async def create_sink(self, loop):
        pass

    async def create_source(self, loop, sink):
        self._sink = sink

    def __init__(self) -> None:
        self._lock = asyncio.Lock()

    async def _get_users_map(self) -> dict["ImunifyPatchUserId", Any]:
        users_map = {}
        for user in await user_list.panel_users():
            patch_id = await get_imunify_patch_id(user["user"])
            if patch_id:
                users_map[patch_id] = user["user"]
        return users_map

    @expect(MessageType.RefreshImunifyPatchSubscription)
    async def refresh_subscription(
        self, _: "RefreshImunifyPatchSubscription"
    ) -> None:
        async with self._lock:  # handle concurrent updates
            users = await self._get_users_map()
            if not users:
                logger.warning("No users found while refreshing subscription")
                return

            subscribed_users_ids = (
                await ImunifyPatchSubscriptionAPI.get_subscriptions(
                    list(users.keys())
                )
            )
            # do not update subscription if something's wrong with API
            if subscribed_users_ids is None:
                return

            for user_id in subscribed_users_ids:
                if user_id in users:
                    await self._set_subscription(users[user_id])
            unsubscribed_users = [
                users[user_id]
                for user_id in users
                if user_id not in subscribed_users_ids
            ]
            self._unset_subscription(unsubscribed_users)

    async def _set_subscription(self, user: str) -> None:
        _, created = ImunifyPatchSubscription.get_or_create(user_id=user)
        if created:
            paths = [
                x.orig_file
                for x in VulnerabilityHit.select(
                    VulnerabilityHit.orig_file
                ).where(
                    VulnerabilityHit.user == user,
                    VulnerabilityHit.status
                    == VulnerabilityHitStatus.VULNERABLE,
                )
            ]
            if paths:
                await self._sink.process_message(
                    VulnerabilityPatchTask(filelist=paths, user=user)
                )

    def _unset_subscription(self, users: list[str]) -> None:
        ImunifyPatchSubscription.delete().where(
            ImunifyPatchSubscription.user_id.in_(users)
        ).execute()