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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 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
from google.api_core.retry import Retry
from google.cloud.tasks_v2.types import Queue
from google.protobuf import timestamp_pb2

timestamp = timestamp_pb2.Timestamp()
timestamp.FromDatetime(
    datetime.now() + timedelta(hours=12)
)  # pylint: disable=no-member

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=None,  # 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="echo \"{{ task_instance.xcom_pull('get_queue') }}\"",
    )
    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,
    )