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from __future__ import annotations

from datetime import datetime

from airflow.models import DAG
from airflow.operators.empty import EmptyOperator

DEFAULT_DATE = datetime(2016, 1, 1)
default_args = dict(start_date=DEFAULT_DATE, owner="airflow")

# DAG tests depends_on_past dependencies
dag_dop = DAG(dag_id="test_depends_on_past", default_args=default_args)
with dag_dop:
    dag_dop_task = EmptyOperator(
        task_id="test_dop_task",
        depends_on_past=True,
    )

# DAG tests wait_for_downstream dependencies
dag_wfd = DAG(dag_id="test_wait_for_downstream", default_args=default_args)
with dag_wfd:
    dag_wfd_upstream = EmptyOperator(
        task_id="upstream_task",
        wait_for_downstream=True,
    )
    dag_wfd_downstream = EmptyOperator(
        task_id="downstream_task",
    )
    dag_wfd_upstream >> dag_wfd_downstream
