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


class ExecDateAfterStartDateDep(BaseTIDep):
    """Determines whether a task's execution date is after start date."""

    NAME = "Execution Date"
    IGNORABLE = True

    @provide_session
    def _get_dep_statuses(self, ti, session, dep_context):
        if ti.task.start_date and ti.execution_date < ti.task.start_date:
            yield self._failing_status(
                reason="The execution date is {} but this is before the task's start "
                "date {}.".format(ti.execution_date.isoformat(), ti.task.start_date.isoformat())
            )

        if ti.task.dag and ti.task.dag.start_date and ti.execution_date < ti.task.dag.start_date:
            yield self._failing_status(
                reason="The execution date is {} but this is before the task's "
                "DAG's start date {}.".format(
                    ti.execution_date.isoformat(), ti.task.dag.start_date.isoformat()
                )
            )