import sentry_sdk
from sentry_sdk.crons import capture_checkin, MonitorStatus
from sentry_sdk.integrations import DidNotEnable
from sentry_sdk.integrations.celery.utils import (
    _get_humanized_interval,
    _now_seconds_since_epoch,
)
from sentry_sdk._types import TYPE_CHECKING
from sentry_sdk.scope import Scope
from sentry_sdk.utils import (
    logger,
    match_regex_list,
)

if TYPE_CHECKING:
    from collections.abc import Callable
    from typing import Any, Optional, TypeVar, Union
    from sentry_sdk._types import (
        MonitorConfig,
        MonitorConfigScheduleType,
        MonitorConfigScheduleUnit,
    )

    F = TypeVar("F", bound=Callable[..., Any])


try:
    from celery import Task, Celery  # type: ignore
    from celery.beat import Scheduler  # type: ignore
    from celery.schedules import crontab, schedule  # type: ignore
    from celery.signals import (  # type: ignore
        task_failure,
        task_success,
        task_retry,
    )
except ImportError:
    raise DidNotEnable("Celery not installed")

try:
    from redbeat.schedulers import RedBeatScheduler  # type: ignore
except ImportError:
    RedBeatScheduler = None


def _get_headers(task):
    # type: (Task) -> dict[str, Any]
    headers = task.request.get("headers") or {}

    # flatten nested headers
    if "headers" in headers:
        headers.update(headers["headers"])
        del headers["headers"]

    headers.update(task.request.get("properties") or {})

    return headers


def _get_monitor_config(celery_schedule, app, monitor_name):
    # type: (Any, Celery, str) -> MonitorConfig
    monitor_config = {}  # type: MonitorConfig
    schedule_type = None  # type: Optional[MonitorConfigScheduleType]
    schedule_value = None  # type: Optional[Union[str, int]]
    schedule_unit = None  # type: Optional[MonitorConfigScheduleUnit]

    if isinstance(celery_schedule, crontab):
        schedule_type = "crontab"
        schedule_value = (
            "{0._orig_minute} "
            "{0._orig_hour} "
            "{0._orig_day_of_month} "
            "{0._orig_month_of_year} "
            "{0._orig_day_of_week}".format(celery_schedule)
        )
    elif isinstance(celery_schedule, schedule):
        schedule_type = "interval"
        (schedule_value, schedule_unit) = _get_humanized_interval(
            celery_schedule.seconds
        )

        if schedule_unit == "second":
            logger.warning(
                "Intervals shorter than one minute are not supported by Sentry Crons. Monitor '%s' has an interval of %s seconds. Use the `exclude_beat_tasks` option in the celery integration to exclude it.",
                monitor_name,
                schedule_value,
            )
            return {}

    else:
        logger.warning(
            "Celery schedule type '%s' not supported by Sentry Crons.",
            type(celery_schedule),
        )
        return {}

    monitor_config["schedule"] = {}
    monitor_config["schedule"]["type"] = schedule_type
    monitor_config["schedule"]["value"] = schedule_value

    if schedule_unit is not None:
        monitor_config["schedule"]["unit"] = schedule_unit

    monitor_config["timezone"] = (
        (
            hasattr(celery_schedule, "tz")
            and celery_schedule.tz is not None
            and str(celery_schedule.tz)
        )
        or app.timezone
        or "UTC"
    )

    return monitor_config


def _patch_beat_apply_entry():
    # type: () -> None
    """
    Makes sure that the Sentry Crons information is set in the Celery Beat task's
    headers so that is is monitored with Sentry Crons.

    This is only called by Celery Beat. After apply_entry is called
    Celery will call apply_async to put the task in the queue.
    """
    from sentry_sdk.integrations.celery import CeleryIntegration

    original_apply_entry = Scheduler.apply_entry

    def sentry_apply_entry(*args, **kwargs):
        # type: (*Any, **Any) -> None
        scheduler, schedule_entry = args
        app = scheduler.app

        celery_schedule = schedule_entry.schedule
        monitor_name = schedule_entry.name

        integration = sentry_sdk.get_client().get_integration(CeleryIntegration)
        if integration is None:
            return original_apply_entry(*args, **kwargs)

        if match_regex_list(monitor_name, integration.exclude_beat_tasks):
            return original_apply_entry(*args, **kwargs)

        # Tasks started by Celery Beat start a new Trace
        scope = Scope.get_isolation_scope()
        scope.set_new_propagation_context()
        scope._name = "celery-beat"

        monitor_config = _get_monitor_config(celery_schedule, app, monitor_name)

        is_supported_schedule = bool(monitor_config)
        if is_supported_schedule:
            headers = schedule_entry.options.pop("headers", {})
            headers.update(
                {
                    "sentry-monitor-slug": monitor_name,
                    "sentry-monitor-config": monitor_config,
                }
            )

            check_in_id = capture_checkin(
                monitor_slug=monitor_name,
                monitor_config=monitor_config,
                status=MonitorStatus.IN_PROGRESS,
            )
            headers.update({"sentry-monitor-check-in-id": check_in_id})

            # Set the Sentry configuration in the options of the ScheduleEntry.
            # Those will be picked up in `apply_async` and added to the headers.
            schedule_entry.options["headers"] = headers

        return original_apply_entry(*args, **kwargs)

    Scheduler.apply_entry = sentry_apply_entry


def _patch_redbeat_maybe_due():
    # type: () -> None

    if RedBeatScheduler is None:
        return

    from sentry_sdk.integrations.celery import CeleryIntegration

    original_maybe_due = RedBeatScheduler.maybe_due

    def sentry_maybe_due(*args, **kwargs):
        # type: (*Any, **Any) -> None
        scheduler, schedule_entry = args
        app = scheduler.app

        celery_schedule = schedule_entry.schedule
        monitor_name = schedule_entry.name

        integration = sentry_sdk.get_client().get_integration(CeleryIntegration)
        if integration is None:
            return original_maybe_due(*args, **kwargs)

        task_should_be_excluded = match_regex_list(
            monitor_name, integration.exclude_beat_tasks
        )
        if task_should_be_excluded:
            return original_maybe_due(*args, **kwargs)

        # Tasks started by Celery Beat start a new Trace
        scope = Scope.get_isolation_scope()
        scope.set_new_propagation_context()
        scope._name = "celery-beat"

        monitor_config = _get_monitor_config(celery_schedule, app, monitor_name)

        is_supported_schedule = bool(monitor_config)
        if is_supported_schedule:
            headers = schedule_entry.options.pop("headers", {})
            headers.update(
                {
                    "sentry-monitor-slug": monitor_name,
                    "sentry-monitor-config": monitor_config,
                }
            )

            check_in_id = capture_checkin(
                monitor_slug=monitor_name,
                monitor_config=monitor_config,
                status=MonitorStatus.IN_PROGRESS,
            )
            headers.update({"sentry-monitor-check-in-id": check_in_id})

            # Set the Sentry configuration in the options of the ScheduleEntry.
            # Those will be picked up in `apply_async` and added to the headers.
            schedule_entry.options["headers"] = headers

        return original_maybe_due(*args, **kwargs)

    RedBeatScheduler.maybe_due = sentry_maybe_due


def _setup_celery_beat_signals():
    # type: () -> None
    task_success.connect(crons_task_success)
    task_failure.connect(crons_task_failure)
    task_retry.connect(crons_task_retry)


def crons_task_success(sender, **kwargs):
    # type: (Task, dict[Any, Any]) -> None
    logger.debug("celery_task_success %s", sender)
    headers = _get_headers(sender)

    if "sentry-monitor-slug" not in headers:
        return

    monitor_config = headers.get("sentry-monitor-config", {})

    start_timestamp_s = float(headers["sentry-monitor-start-timestamp-s"])

    capture_checkin(
        monitor_slug=headers["sentry-monitor-slug"],
        monitor_config=monitor_config,
        check_in_id=headers["sentry-monitor-check-in-id"],
        duration=_now_seconds_since_epoch() - start_timestamp_s,
        status=MonitorStatus.OK,
    )


def crons_task_failure(sender, **kwargs):
    # type: (Task, dict[Any, Any]) -> None
    logger.debug("celery_task_failure %s", sender)
    headers = _get_headers(sender)

    if "sentry-monitor-slug" not in headers:
        return

    monitor_config = headers.get("sentry-monitor-config", {})

    start_timestamp_s = float(headers["sentry-monitor-start-timestamp-s"])

    capture_checkin(
        monitor_slug=headers["sentry-monitor-slug"],
        monitor_config=monitor_config,
        check_in_id=headers["sentry-monitor-check-in-id"],
        duration=_now_seconds_since_epoch() - start_timestamp_s,
        status=MonitorStatus.ERROR,
    )


def crons_task_retry(sender, **kwargs):
    # type: (Task, dict[Any, Any]) -> None
    logger.debug("celery_task_retry %s", sender)
    headers = _get_headers(sender)

    if "sentry-monitor-slug" not in headers:
        return

    monitor_config = headers.get("sentry-monitor-config", {})

    start_timestamp_s = float(headers["sentry-monitor-start-timestamp-s"])

    capture_checkin(
        monitor_slug=headers["sentry-monitor-slug"],
        monitor_config=monitor_config,
        check_in_id=headers["sentry-monitor-check-in-id"],
        duration=_now_seconds_since_epoch() - start_timestamp_s,
        status=MonitorStatus.ERROR,
    )