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


class ExecDateAfterStartDateDep(BaseTIDep):
    NAME = "Execution Date"
    IGNOREABLE = 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 {0} but this is before the task's start "
                "date {1}.".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 {0} but this is before the task's "
                "DAG's start date {1}.".format(
                    ti.execution_date.isoformat(),
                    ti.task.dag.start_date.isoformat()))
