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from __future__ import annotations

import os
from datetime import datetime

from airflow import models
from airflow.decorators import task
from airflow.providers.amazon.aws.hooks.s3 import S3Hook
from airflow.providers.amazon.aws.operators.s3 import S3CreateBucketOperator, S3DeleteBucketOperator
from airflow.providers.google.cloud.operators.gcs import GCSCreateBucketOperator, GCSDeleteBucketOperator
from airflow.providers.google.cloud.transfers.s3_to_gcs import S3ToGCSOperator
from airflow.utils.trigger_rule import TriggerRule

ENV_ID = os.environ.get("SYSTEM_TESTS_ENV_ID")
GCP_PROJECT_ID = os.environ.get("SYSTEM_TESTS_GCP_PROJECT")
DAG_ID = "example_s3_to_gcs"

BUCKET_NAME = f"bucket_{DAG_ID}_{ENV_ID}"
GCS_BUCKET_URL = f"gs://{BUCKET_NAME}/"
UPLOAD_FILE = "/tmp/example-file.txt"
PREFIX = "TESTS"


@task(task_id="upload_file_to_s3")
def upload_file():
    """A callable to upload file to AWS bucket"""
    s3_hook = S3Hook()
    s3_hook.load_file(filename=UPLOAD_FILE, key=PREFIX, bucket_name=BUCKET_NAME)


with models.DAG(
    DAG_ID,
    schedule="@once",
    start_date=datetime(2021, 1, 1),
    catchup=False,
    tags=["example", "s3"],
) as dag:
    create_s3_bucket = S3CreateBucketOperator(
        task_id="create_s3_bucket", bucket_name=BUCKET_NAME, region_name="us-east-1"
    )

    create_gcs_bucket = GCSCreateBucketOperator(
        task_id="create_bucket",
        bucket_name=BUCKET_NAME,
        project_id=GCP_PROJECT_ID,
    )

    # [START howto_transfer_s3togcs_operator_async]
    transfer_to_gcs = S3ToGCSOperator(
        task_id="s3_to_gcs_task", bucket=BUCKET_NAME, prefix=PREFIX, dest_gcs=GCS_BUCKET_URL, deferrable=True
    )
    # [END howto_transfer_s3togcs_operator_async]

    delete_s3_bucket = S3DeleteBucketOperator(
        task_id="delete_s3_bucket",
        bucket_name=BUCKET_NAME,
        force_delete=True,
        trigger_rule=TriggerRule.ALL_DONE,
    )

    delete_gcs_bucket = GCSDeleteBucketOperator(
        task_id="delete_gcs_bucket", bucket_name=BUCKET_NAME, trigger_rule=TriggerRule.ALL_DONE
    )

    (
        # TEST SETUP
        create_gcs_bucket
        >> create_s3_bucket
        >> upload_file()
        # TEST BODY
        >> transfer_to_gcs
        # TEST TEARDOWN
        >> delete_s3_bucket
        >> delete_gcs_bucket
    )

    from tests.system.utils.watcher import watcher

    # This test needs watcher in order to properly mark success/failure
    # when "tearDown" task with trigger rule is part of the DAG
    list(dag.tasks) >> watcher()


from tests.system.utils import get_test_run  # noqa: E402

# Needed to run the example DAG with pytest (see: tests/system/README.md#run_via_pytest)
test_run = get_test_run(dag)
