import asyncio
import logging
import time
from pathlib import Path

from defence360agent.internals.iaid import IAIDTokenError
from defence360agent.api.server import APIError
from defence360agent.api.server.events import EventsAPI
from defence360agent.contracts.config import (
    Core,
    IContactMessageType,
)
from defence360agent.contracts.messages import MessageType
from defence360agent.contracts.plugins import (
    MessageSink,
    MessageSource,
)
from defence360agent.internals.the_sink import TheSink
from defence360agent.model.icontact import IContactThrottle
from defence360agent.subsys.panels.cpanel import cPanel
from defence360agent.subsys.panels.hosting_panel import HostingPanel
from defence360agent.utils import (
    await_for,
    create_task_and_log_exceptions,
    recurring_check,
    retry_on,
    Scope,
)
from defence360agent.utils.common import DAY

logger = logging.getLogger(__name__)


async def async_log_on_error(e, i):
    logger.warning(
        "Can't get recommendations for the dashboard due to "
        "iaid token error, reason: %s. Attempt %s",
        e,
        i,
    )
    await_for(seconds=100)


class IContactSender(MessageSink, MessageSource):
    PROCESSING_ORDER = MessageSink.ProcessingOrder.ICONTACT_SENT
    SCOPE = Scope.AV_IM360

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self._tasks = []
        self._notification_flag_path = (
            Path(Core.TMPDIR) / "icontact_generic_notifications"
        )

    async def create_sink(self, loop):
        pass

    async def _send_icontact_message(
        self,
        *,
        message_type,
        params,
        period_limit,
        user=None,
    ):
        if message_type is None:
            return
        if not IContactThrottle.may_be_notified(
            message_type,
            period_limit,
            user=user,
        ):
            return
        template_args = await self._panel.notify(
            message_type=IContactMessageType.GENERIC,
            params=params,
            user=user,
        )
        if template_args:
            IContactThrottle.refresh(message_type, user=user)
            sent_message = MessageType.IContactSent(
                message_type=message_type,
                timestamp=int(time.time()),
                template_args=template_args,
            )
            await self._sink.process_message(sent_message)

    async def create_source(self, loop, sink: TheSink):
        self._sink = sink
        self._panel = HostingPanel()
        if self._panel.NAME == cPanel.NAME:
            self._tasks = [
                create_task_and_log_exceptions(
                    loop, self.generic_notifications
                )
            ]

    async def shutdown(self):
        for task in self._tasks:
            task.cancel()
        await asyncio.gather(*self._tasks, return_exceptions=True)

    @retry_on(
        APIError,
        on_error=await_for(seconds=10),
        max_tries=3,
        silent=True,
        log=logger,
    )
    @retry_on(
        IAIDTokenError,
        on_error=async_log_on_error,
        max_tries=3,
        silent=True,
        log=logger,
    )
    async def get_notifications(self) -> list:
        notifications = []
        if (
            not self._notification_flag_path.exists()
            or (self._notification_flag_path.stat().st_mtime + DAY)
            < time.time()
        ):  # send notification request no more than once a day
            notifications = await EventsAPI.notification()
            # update flag modify time
            self._notification_flag_path.touch(mode=0o644, exist_ok=True)
        return notifications

    @recurring_check(DAY)
    async def generic_notifications(self):
        if notifications := await self.get_notifications():
            logger.info(
                "Sending %s generic icontact notifications", len(notifications)
            )
            for notification in notifications:
                await self._send_icontact_message(
                    message_type=notification["type"],
                    params={
                        "subject": notification["notification_subject"],
                        "body_html": notification["notification_body_html"],
                    },
                    period_limit=notification["notification_period_limit"],
                    user=notification.get("notification_user"),
                )