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# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License.  You may obtain a copy of the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
#
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# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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# specific language governing permissions and limitations
# under the License.

from datetime import datetime

import boto3

from airflow import models
from airflow.decorators import task
from airflow.models.baseoperator import chain
from airflow.providers.amazon.aws.operators.datasync import DataSyncOperator
from airflow.providers.amazon.aws.operators.s3 import S3CreateBucketOperator, S3DeleteBucketOperator
from airflow.utils.trigger_rule import TriggerRule
from tests.system.providers.amazon.aws.utils import ENV_ID_KEY, SystemTestContextBuilder

DAG_ID = 'example_datasync'

# Externally fetched variables:
ROLE_ARN_KEY = 'ROLE_ARN'

sys_test_context_task = SystemTestContextBuilder().add_variable(ROLE_ARN_KEY).build()


def get_s3_bucket_arn(bucket_name):
    return f'arn:aws:s3:::{bucket_name}'


def create_location(bucket_name, role_arn):
    client = boto3.client('datasync')
    response = client.create_location_s3(
        Subdirectory='test',
        S3BucketArn=get_s3_bucket_arn(bucket_name),
        S3Config={
            'BucketAccessRoleArn': role_arn,
        },
    )
    return response['LocationArn']


@task
def create_source_location(bucket_source, role_arn):
    return create_location(bucket_source, role_arn)


@task
def create_destination_location(bucket_destination, role_arn):
    return create_location(bucket_destination, role_arn)


@task
def create_task(**kwargs):
    client = boto3.client('datasync')
    response = client.create_task(
        SourceLocationArn=kwargs['ti'].xcom_pull('create_source_location'),
        DestinationLocationArn=kwargs['ti'].xcom_pull('create_destination_location'),
    )
    return response['TaskArn']


@task(trigger_rule=TriggerRule.ALL_DONE)
def delete_task(task_arn):
    client = boto3.client('datasync')
    client.delete_task(
        TaskArn=task_arn,
    )


@task(trigger_rule=TriggerRule.ALL_DONE)
def delete_task_created_by_operator(**kwargs):
    client = boto3.client('datasync')
    client.delete_task(
        TaskArn=kwargs['ti'].xcom_pull('create_and_execute_task')['TaskArn'],
    )


@task(trigger_rule=TriggerRule.ALL_DONE)
def list_locations(bucket_source, bucket_destination):
    client = boto3.client('datasync')
    return client.list_locations(
        Filters=[
            {
                'Name': 'LocationUri',
                'Values': [
                    f's3://{bucket_source}/test/',
                    f's3://{bucket_destination}/test/',
                    f's3://{bucket_source}/test_create/',
                    f's3://{bucket_destination}/test_create/',
                ],
                'Operator': 'In',
            }
        ]
    )


@task(trigger_rule=TriggerRule.ALL_DONE)
def delete_locations(locations):
    client = boto3.client('datasync')
    for location in locations['Locations']:
        client.delete_location(
            LocationArn=location['LocationArn'],
        )


with models.DAG(
    DAG_ID,
    schedule_interval='@once',
    start_date=datetime(2021, 1, 1),
    catchup=False,
    tags=['example'],
) as dag:
    test_context = sys_test_context_task()

    s3_bucket_source: str = f'{test_context[ENV_ID_KEY]}-datasync-bucket-source'
    s3_bucket_destination: str = f'{test_context[ENV_ID_KEY]}-datasync-bucket-destination'

    create_s3_bucket_source = S3CreateBucketOperator(
        task_id='create_s3_bucket_source', bucket_name=s3_bucket_source
    )

    create_s3_bucket_destination = S3CreateBucketOperator(
        task_id='create_s3_bucket_destination', bucket_name=s3_bucket_destination
    )

    source_location = create_source_location(s3_bucket_source, test_context[ROLE_ARN_KEY])
    destination_location = create_destination_location(s3_bucket_destination, test_context[ROLE_ARN_KEY])

    created_task_arn = create_task()

    # [START howto_operator_datasync_specific_task]
    # Execute a specific task
    execute_task_by_arn = DataSyncOperator(
        task_id='execute_task_by_arn',
        task_arn=created_task_arn,
        wait_for_completion=False,
    )
    # [END howto_operator_datasync_specific_task]

    # [START howto_operator_datasync_search_task]
    # Search and execute a task
    execute_task_by_locations = DataSyncOperator(
        task_id='execute_task_by_locations',
        source_location_uri=f's3://{s3_bucket_source}/test',
        destination_location_uri=f's3://{s3_bucket_destination}/test',
        # Only transfer files from /test/subdir folder
        task_execution_kwargs={
            'Includes': [{'FilterType': 'SIMPLE_PATTERN', 'Value': '/test/subdir'}],
        },
        wait_for_completion=False,
    )
    # [END howto_operator_datasync_search_task]

    # [START howto_operator_datasync_create_task]
    # Create a task (the task does not exist)
    create_and_execute_task = DataSyncOperator(
        task_id='create_and_execute_task',
        source_location_uri=f's3://{s3_bucket_source}/test_create',
        destination_location_uri=f's3://{s3_bucket_destination}/test_create',
        create_task_kwargs={"Name": "Created by Airflow"},
        create_source_location_kwargs={
            'Subdirectory': 'test_create',
            'S3BucketArn': get_s3_bucket_arn(s3_bucket_source),
            'S3Config': {
                'BucketAccessRoleArn': test_context[ROLE_ARN_KEY],
            },
        },
        create_destination_location_kwargs={
            'Subdirectory': 'test_create',
            'S3BucketArn': get_s3_bucket_arn(s3_bucket_destination),
            'S3Config': {
                'BucketAccessRoleArn': test_context[ROLE_ARN_KEY],
            },
        },
        delete_task_after_execution=False,
        wait_for_completion=False,
    )
    # [END howto_operator_datasync_create_task]

    locations_task = list_locations(s3_bucket_source, s3_bucket_destination)
    delete_locations_task = delete_locations(locations_task)

    delete_s3_bucket_source = S3DeleteBucketOperator(
        task_id='delete_s3_bucket_source',
        bucket_name=s3_bucket_source,
        force_delete=True,
        trigger_rule=TriggerRule.ALL_DONE,
    )

    delete_s3_bucket_destination = S3DeleteBucketOperator(
        task_id='delete_s3_bucket_destination',
        bucket_name=s3_bucket_destination,
        force_delete=True,
        trigger_rule=TriggerRule.ALL_DONE,
    )

    chain(
        # TEST SETUP
        test_context,
        create_s3_bucket_source,
        create_s3_bucket_destination,
        source_location,
        destination_location,
        created_task_arn,
        # TEST BODY
        execute_task_by_arn,
        execute_task_by_locations,
        create_and_execute_task,
        # TEST TEARDOWN
        delete_task(created_task_arn),
        delete_task_created_by_operator(),
        locations_task,
        delete_locations_task,
        delete_s3_bucket_source,
        delete_s3_bucket_destination,
    )

    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)

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