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from __future__ import annotations

from airflow.ti_deps.deps.base_ti_dep import BaseTIDep
from airflow.utils.session import provide_session
from airflow.utils.state import DagRunState


class DagrunRunningDep(BaseTIDep):
    """Determines whether a task's DagRun is in valid state."""

    NAME = "Dagrun Running"
    IGNORABLE = True

    @provide_session
    def _get_dep_statuses(self, ti, dep_context, *, session):
        dr = ti.get_dagrun(session=session)
        if dr.state != DagRunState.RUNNING:
            yield self._failing_status(
                reason=f"Task instance's dagrun was not in the 'running' state but in the state '{dr.state}'."
            )
