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# to you under the Apache License, Version 2.0 (the
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#   http://www.apache.org/licenses/LICENSE-2.0
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from __future__ import annotations

from datetime import timedelta

from airflow.models import DAG
from airflow.operators.python import PythonOperator
from airflow.utils.timezone import datetime

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


def fail():
    raise ValueError("Expected failure.")


def success(ti=None, *args, **kwargs):
    if ti.execution_date != DEFAULT_DATE + timedelta(days=1):
        fail()


# DAG tests that tasks ignore all dependencies

dag1 = DAG(
    dag_id="test_run_ignores_all_dependencies", default_args=dict(depends_on_past=True, **default_args)
)
dag1_task1 = PythonOperator(task_id="test_run_dependency_task", python_callable=fail, dag=dag1)
dag1_task2 = PythonOperator(task_id="test_run_dependent_task", python_callable=success, dag=dag1)
dag1_task1.set_downstream(dag1_task2)
