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  """
  Example Airflow DAG that creates, gets, lists, updates, purges, pauses, resumes
  and deletes Queues and creates, gets, lists, runs and deletes Tasks in the Google
  Cloud Tasks service in the Google Cloud.
  """
  import os
  from datetime import datetime, timedelta
  
  from google.api_core.retry import Retry
  from google.cloud.tasks_v2.types import Queue
  from google.protobuf import timestamp_pb2
  
  from airflow import models
  from airflow.models.baseoperator import chain
  from airflow.operators.bash import BashOperator
  from airflow.providers.google.cloud.operators.tasks import (
      CloudTasksQueueCreateOperator,
      CloudTasksQueueDeleteOperator,
      CloudTasksQueueGetOperator,
      CloudTasksQueuePauseOperator,
      CloudTasksQueuePurgeOperator,
      CloudTasksQueueResumeOperator,
      CloudTasksQueuesListOperator,
      CloudTasksQueueUpdateOperator,
      CloudTasksTaskCreateOperator,
      CloudTasksTaskDeleteOperator,
      CloudTasksTaskGetOperator,
      CloudTasksTaskRunOperator,
      CloudTasksTasksListOperator,
  )
  from airflow.utils.dates import days_ago
  
  timestamp = timestamp_pb2.Timestamp()
  timestamp.FromDatetime(datetime.now() + timedelta(hours=12))
  
  LOCATION = "europe-west1"
  QUEUE_ID = os.environ.get('GCP_TASKS_QUEUE_ID', "cloud-tasks-queue")
  TASK_NAME = "task-to-run"
  
  
  TASK = {
      "app_engine_http_request": {  # Specify the type of request.
          "http_method": "POST",
          "relative_uri": "/example_task_handler",
          "body": b"Hello",
      },
      "schedule_time": timestamp,
  }
  
  with models.DAG(
      "example_gcp_tasks",
      schedule_interval='@once',  # Override to match your needs
      start_date=days_ago(1),
      tags=['example'],
  ) as dag:
  
      # Queue operations
      create_queue = CloudTasksQueueCreateOperator(
          location=LOCATION,
          task_queue=Queue(stackdriver_logging_config=dict(sampling_ratio=0.5)),
          queue_name=QUEUE_ID,
          retry=Retry(maximum=10.0),
          timeout=5,
          task_id="create_queue",
      )
  
      delete_queue = CloudTasksQueueDeleteOperator(
          location=LOCATION,
          queue_name=QUEUE_ID,
          task_id="delete_queue",
      )
  
      resume_queue = CloudTasksQueueResumeOperator(
          location=LOCATION,
          queue_name=QUEUE_ID,
          task_id="resume_queue",
      )
  
      pause_queue = CloudTasksQueuePauseOperator(
          location=LOCATION,
          queue_name=QUEUE_ID,
          task_id="pause_queue",
      )
  
      purge_queue = CloudTasksQueuePurgeOperator(
          location=LOCATION,
          queue_name=QUEUE_ID,
          task_id="purge_queue",
      )
  
      get_queue = CloudTasksQueueGetOperator(
          location=LOCATION,
          queue_name=QUEUE_ID,
          task_id="get_queue",
      )
  
      get_queue_result = BashOperator(
          task_id="get_queue_result",
          bash_command=f"echo {get_queue.output}",
      )
  
      get_queue >> get_queue_result
  
      update_queue = CloudTasksQueueUpdateOperator(
          task_queue=Queue(stackdriver_logging_config=dict(sampling_ratio=1)),
          location=LOCATION,
          queue_name=QUEUE_ID,
          update_mask={"paths": ["stackdriver_logging_config.sampling_ratio"]},
          task_id="update_queue",
      )
  
      list_queue = CloudTasksQueuesListOperator(location=LOCATION, task_id="list_queue")
  
      chain(
          create_queue,
          update_queue,
          pause_queue,
          resume_queue,
          purge_queue,
          get_queue,
          list_queue,
          delete_queue,
      )
  
      # Tasks operations
      create_task = CloudTasksTaskCreateOperator(
          location=LOCATION,
          queue_name=QUEUE_ID,
          task=TASK,
          task_name=TASK_NAME,
          retry=Retry(maximum=10.0),
          timeout=5,
          task_id="create_task_to_run",
      )
  
      tasks_get = CloudTasksTaskGetOperator(
          location=LOCATION,
          queue_name=QUEUE_ID,
          task_name=TASK_NAME,
          task_id="tasks_get",
      )
  
      run_task = CloudTasksTaskRunOperator(
          location=LOCATION,
          queue_name=QUEUE_ID,
          task_name=TASK_NAME,
          task_id="run_task",
      )
  
      list_tasks = CloudTasksTasksListOperator(location=LOCATION, queue_name=QUEUE_ID, task_id="list_tasks")
  
      delete_task = CloudTasksTaskDeleteOperator(
          location=LOCATION, queue_name=QUEUE_ID, task_name=TASK_NAME, task_id="delete_task"
      )
  
      chain(purge_queue, create_task, tasks_get, list_tasks, run_task, delete_task, delete_queue)
  