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"""
Example usage of the TriggerDagRunOperator. This example holds 2 DAGs:
1. 1st DAG (example_trigger_controller_dag) holds a TriggerDagRunOperator, which will trigger the 2nd DAG
2. 2nd DAG (example_trigger_target_dag) which will be triggered by the TriggerDagRunOperator in the 1st DAG
"""
from datetime import datetime

from airflow import DAG
from airflow.operators.bash import BashOperator
from airflow.operators.python import PythonOperator


def run_this_func(dag_run):
    """
    Print the payload "message" passed to the DagRun conf attribute.

    :param dag_run: The DagRun object
    :type dag_run: DagRun
    """
    print(f"Remotely received value of {dag_run.conf['message']} for key=message")


with DAG(
    dag_id="example_trigger_target_dag",
    start_date=datetime(2021, 1, 1),
    catchup=False,
    schedule_interval=None,
    tags=['example'],
) as dag:
    run_this = PythonOperator(task_id="run_this", python_callable=run_this_func)

    bash_task = BashOperator(
        task_id="bash_task",
        bash_command='echo "Here is the message: $message"',
        env={'message': '{{ dag_run.conf["message"] if dag_run else "" }}'},
    )