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from datetime import timedelta

from airflow import DAG
from airflow.operators.bash_operator import BashOperator
from airflow.providers.singularity.operators.singularity import SingularityOperator
from airflow.utils.dates import days_ago

default_args = {
    "owner": "airflow",
    "depends_on_past": False,
    "email": ["airflow@example.com"],
    "email_on_failure": False,
    "email_on_retry": False,
    "retries": 1,
    "retry_delay": timedelta(minutes=5),
}

with DAG(
    "singularity_sample",
    default_args=default_args,
    schedule_interval=timedelta(minutes=10),
    start_date=days_ago(0),
) as dag:

    t1 = BashOperator(task_id="print_date", bash_command="date", dag=dag)

    t2 = BashOperator(task_id="sleep", bash_command="sleep 5", retries=3, dag=dag)

    t3 = SingularityOperator(
        command="/bin/sleep 30",
        image="docker://busybox:1.30.1",
        task_id="singularity_op_tester",
        dag=dag,
    )

    t4 = BashOperator(
        task_id="print_hello", bash_command='echo "hello world!!!"', dag=dag
    )

    t1 >> [t2, t3]
    t3 >> t4