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"""
Example DAG using LocalFilesystemToGoogleDriveOperator.

Using this operator requires the following additional scopes:
https://www.googleapis.com/auth/drive
"""

from __future__ import annotations

import json
import logging
import os
from datetime import datetime
from pathlib import Path
from typing import Any

from airflow.decorators import task
from airflow.models.dag import DAG
from airflow.providers.google.suite.hooks.drive import GoogleDriveHook
from airflow.providers.google.suite.transfers.local_to_drive import LocalFilesystemToGoogleDriveOperator
from airflow.utils.trigger_rule import TriggerRule

from tests_common.test_utils.api_client_helpers import create_airflow_connection, delete_airflow_connection

DAG_ID = "local_to_drive"
ENV_ID = os.environ.get("SYSTEM_TESTS_ENV_ID", "default")

FILE_NAME_1 = "test1"
FILE_NAME_2 = "test2"
CONNECTION_ID = f"connection_{DAG_ID}_{ENV_ID}"

LOCAL_PATH = str(Path(__file__).parent / "resources")

SINGLE_FILE_LOCAL_PATHS = [str(Path(LOCAL_PATH) / FILE_NAME_1)]
MULTIPLE_FILES_LOCAL_PATHS = [str(Path(LOCAL_PATH) / FILE_NAME_1), str(Path(LOCAL_PATH) / FILE_NAME_2)]

DRIVE_FOLDER = f"test_folder_{DAG_ID}_{ENV_ID}"


log = logging.getLogger(__name__)


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

    @task
    def create_connection(connection_id: str):
        conn_extra_json = json.dumps({"scope": "https://www.googleapis.com/auth/drive"})
        connection: dict[str, Any] = {"conn_type": "google_cloud_platform", "extra": conn_extra_json}
        create_airflow_connection(
            connection_id=connection_id,
            connection_conf=connection,
        )

    create_connection_task = create_connection(connection_id=CONNECTION_ID)

    # [START howto_operator_local_to_drive_upload_single_file]
    upload_single_file = LocalFilesystemToGoogleDriveOperator(
        gcp_conn_id=CONNECTION_ID,
        task_id="upload_single_file",
        local_paths=SINGLE_FILE_LOCAL_PATHS,
        drive_folder=DRIVE_FOLDER,
    )
    # [END howto_operator_local_to_drive_upload_single_file]

    # [START howto_operator_local_to_drive_upload_multiple_files]
    upload_multiple_files = LocalFilesystemToGoogleDriveOperator(
        gcp_conn_id=CONNECTION_ID,
        task_id="upload_multiple_files",
        local_paths=MULTIPLE_FILES_LOCAL_PATHS,
        drive_folder=DRIVE_FOLDER,
        ignore_if_missing=True,
    )
    # [END howto_operator_local_to_drive_upload_multiple_files]

    @task(trigger_rule=TriggerRule.ALL_DONE)
    def remove_files_from_drive():
        service = GoogleDriveHook(gcp_conn_id=CONNECTION_ID).get_conn()
        root_path = (
            service.files()
            .list(q=f"name = '{DRIVE_FOLDER}' and mimeType = 'application/vnd.google-apps.folder'")
            .execute()
        )
        if files := root_path["files"]:
            batch = service.new_batch_http_request()
            for file in files:
                log.info("Preparing to remove file: {}", file)
                batch.add(service.files().delete(fileId=file["id"]))
            batch.execute()
            log.info("Selected files removed.")

    remove_files_from_drive_task = remove_files_from_drive()

    @task(task_id="delete_connection")
    def delete_connection(connection_id: str) -> None:
        delete_airflow_connection(connection_id=connection_id)

    delete_connection_task = delete_connection(connection_id=CONNECTION_ID)

    (
        # TEST SETUP
        create_connection_task
        # TEST BODY
        >> upload_single_file
        >> upload_multiple_files
        # TEST TEARDOWN
        >> remove_files_from_drive_task
        >> delete_connection_task
    )

    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)
