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from __future__ import annotations

import os
from datetime import datetime
from pathlib import Path

import pytest

from airflow.models.dag import DAG
from airflow.providers.google.cloud.operators.gcs import GCSCreateBucketOperator, GCSDeleteBucketOperator

from system.google import DEFAULT_GCP_SYSTEM_TEST_PROJECT_ID
from system.openlineage.operator import OpenLineageTestOperator

try:
    from airflow.providers.google.cloud.transfers.mssql_to_gcs import MSSQLToGCSOperator
except ImportError:
    pytest.skip("MSSQL not available", allow_module_level=True)

from airflow.utils.trigger_rule import TriggerRule

ENV_ID = os.environ.get("SYSTEM_TESTS_ENV_ID", "default")
PROJECT_ID = os.environ.get("SYSTEM_TESTS_GCP_PROJECT") or DEFAULT_GCP_SYSTEM_TEST_PROJECT_ID
DAG_ID = "example_mssql_to_gcs"

BUCKET_NAME = f"bucket_{DAG_ID}_{ENV_ID}"

FILENAME = "test_file"

SQL_QUERY = "USE airflow SELECT * FROM Country;"

with DAG(
    DAG_ID,
    schedule="@once",
    start_date=datetime(2021, 1, 1),
    catchup=False,
    tags=["example", "mssql"],
) as dag:
    create_bucket = GCSCreateBucketOperator(
        task_id="create_bucket", bucket_name=BUCKET_NAME, project_id=PROJECT_ID
    )

    # [START howto_operator_mssql_to_gcs]
    upload_mssql_to_gcs = MSSQLToGCSOperator(
        task_id="mssql_to_gcs",
        mssql_conn_id="airflow_mssql",
        sql=SQL_QUERY,
        bucket=BUCKET_NAME,
        filename=FILENAME,
        export_format="csv",
    )
    # [END howto_operator_mssql_to_gcs]

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

    check_openlineage_events = OpenLineageTestOperator(
        task_id="check_openlineage_events",
        file_path=str(Path(__file__).parent / "resources" / "openlineage" / "mssql_to_gcs.json"),
    )

    (
        # TEST SETUP
        create_bucket
        # TEST BODY
        >> upload_mssql_to_gcs
        # TEST TEARDOWN
        >> [delete_bucket, check_openlineage_events]
    )

    from tests_common.test_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_common.test_utils.system_tests 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)
