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from __future__ import annotations

from airflow.executors.executor_loader import ExecutorLoader
from airflow.models.taskreschedule import TaskReschedule
from airflow.ti_deps.deps.base_ti_dep import BaseTIDep
from airflow.utils import timezone
from airflow.utils.session import provide_session
from airflow.utils.state import TaskInstanceState


class ReadyToRescheduleDep(BaseTIDep):
    """Determines whether a task is ready to be rescheduled."""

    NAME = "Ready To Reschedule"
    IGNORABLE = True
    IS_TASK_DEP = True
    RESCHEDULEABLE_STATES = {TaskInstanceState.UP_FOR_RESCHEDULE, None}

    @provide_session
    def _get_dep_statuses(self, ti, session, dep_context):
        """
        Determine whether a task is ready to be rescheduled.

        Only tasks in NONE state with at least one row in task_reschedule table are
        handled by this dependency class, otherwise this dependency is considered as passed.
        This dependency fails if the latest reschedule request's reschedule date is still
        in the future.
        """
        from airflow.models.mappedoperator import MappedOperator

        is_mapped = isinstance(ti.task, MappedOperator)
        executor, _ = ExecutorLoader.import_default_executor_cls()
        if (
            # Mapped sensors don't have the reschedule property (it can only be calculated after unmapping),
            # so we don't check them here. They are handled below by checking TaskReschedule instead.
            not is_mapped
            and not getattr(ti.task, "reschedule", False)
            # Executors can force running in reschedule mode,
            # in which case we ignore the value of the task property.
            and not executor.change_sensor_mode_to_reschedule
        ):
            yield self._passing_status(reason="Task is not in reschedule mode.")
            return

        if dep_context.ignore_in_reschedule_period:
            yield self._passing_status(
                reason="The context specified that being in a reschedule period was permitted."
            )
            return

        if ti.state not in self.RESCHEDULEABLE_STATES:
            yield self._passing_status(
                reason="The task instance is not in State_UP_FOR_RESCHEDULE or NONE state."
            )
            return

        task_reschedule = (
            TaskReschedule.query_for_task_instance(task_instance=ti, descending=True, session=session)
            .with_entities(TaskReschedule.reschedule_date)
            .first()
        )
        if not task_reschedule:
            # Because mapped sensors don't have the reschedule property, here's the last resort
            # and we need a slightly different passing reason
            if is_mapped:
                yield self._passing_status(reason="The task is mapped and not in reschedule mode")
                return
            yield self._passing_status(reason="There is no reschedule request for this task instance.")
            return

        now = timezone.utcnow()
        next_reschedule_date = task_reschedule.reschedule_date
        if now >= next_reschedule_date:
            yield self._passing_status(reason="Task instance id ready for reschedule.")
            return

        yield self._failing_status(
            reason=(
                "Task is not ready for reschedule yet but will be rescheduled automatically. "
                f"Current date is {now.isoformat()} and task will be "
                f"rescheduled at {next_reschedule_date.isoformat()}."
            )
        )
