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#
#   http://www.apache.org/licenses/LICENSE-2.0
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from __future__ import annotations

from datetime import datetime

from airflow import DAG
from airflow.models.baseoperator import chain
from airflow.providers.amazon.aws.operators.rds import (
    RdsCopyDbSnapshotOperator,
    RdsCreateDbInstanceOperator,
    RdsCreateDbSnapshotOperator,
    RdsDeleteDbInstanceOperator,
    RdsDeleteDbSnapshotOperator,
)
from airflow.providers.amazon.aws.sensors.rds import RdsSnapshotExistenceSensor
from airflow.utils.trigger_rule import TriggerRule
from tests.system.providers.amazon.aws.utils import ENV_ID_KEY, SystemTestContextBuilder

DAG_ID = "example_rds_snapshot"

sys_test_context_task = SystemTestContextBuilder().build()


with DAG(
    dag_id=DAG_ID,
    schedule="@once",
    start_date=datetime(2021, 1, 1),
    tags=["example"],
    catchup=False,
) as dag:
    test_context = sys_test_context_task()

    rds_db_name = f"{test_context[ENV_ID_KEY]}_db"
    rds_instance_name = f"{test_context[ENV_ID_KEY]}-instance"
    rds_snapshot_name = f"{test_context[ENV_ID_KEY]}-snapshot"
    rds_snapshot_copy_name = f"{rds_snapshot_name}-copy"

    create_db_instance = RdsCreateDbInstanceOperator(
        task_id="create_db_instance",
        db_instance_identifier=rds_instance_name,
        db_instance_class="db.t4g.micro",
        engine="postgres",
        rds_kwargs={
            "MasterUsername": "rds_username",
            # NEVER store your production password in plaintext in a DAG like this.
            # Use Airflow Secrets or a secret manager for this in production.
            "MasterUserPassword": "rds_password",
            "AllocatedStorage": 20,
            "DBName": rds_db_name,
            "PubliclyAccessible": False,
        },
    )

    # [START howto_operator_rds_create_db_snapshot]
    create_snapshot = RdsCreateDbSnapshotOperator(
        task_id="create_snapshot",
        db_type="instance",
        db_identifier=rds_instance_name,
        db_snapshot_identifier=rds_snapshot_name,
    )
    # [END howto_operator_rds_create_db_snapshot]

    # [START howto_sensor_rds_snapshot_existence]
    snapshot_sensor = RdsSnapshotExistenceSensor(
        task_id="snapshot_sensor",
        db_type="instance",
        db_snapshot_identifier=rds_snapshot_name,
        target_statuses=["available"],
    )
    # [END howto_sensor_rds_snapshot_existence]

    # [START howto_operator_rds_copy_snapshot]
    copy_snapshot = RdsCopyDbSnapshotOperator(
        task_id="copy_snapshot",
        db_type="instance",
        source_db_snapshot_identifier=rds_snapshot_name,
        target_db_snapshot_identifier=rds_snapshot_copy_name,
    )
    # [END howto_operator_rds_copy_snapshot]

    # [START howto_operator_rds_delete_snapshot]
    delete_snapshot = RdsDeleteDbSnapshotOperator(
        task_id="delete_snapshot",
        db_type="instance",
        db_snapshot_identifier=rds_snapshot_name,
    )
    # [END howto_operator_rds_delete_snapshot]

    snapshot_copy_sensor = RdsSnapshotExistenceSensor(
        task_id="snapshot_copy_sensor",
        db_type="instance",
        db_snapshot_identifier=rds_snapshot_copy_name,
        target_statuses=["available"],
    )

    delete_snapshot_copy = RdsDeleteDbSnapshotOperator(
        task_id="delete_snapshot_copy",
        db_type="instance",
        db_snapshot_identifier=rds_snapshot_copy_name,
        trigger_rule=TriggerRule.ALL_DONE,
    )

    delete_db_instance = RdsDeleteDbInstanceOperator(
        task_id="delete_db_instance",
        db_instance_identifier=rds_instance_name,
        rds_kwargs={"SkipFinalSnapshot": True},
        trigger_rule=TriggerRule.ALL_DONE,
    )

    chain(
        # TEST SETUP
        test_context,
        create_db_instance,
        # TEST BODY
        create_snapshot,
        snapshot_sensor,
        copy_snapshot,
        delete_snapshot,
        # TEST TEARDOWN
        snapshot_copy_sensor,
        delete_snapshot_copy,
        delete_db_instance,
    )

    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)
