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#   http://www.apache.org/licenses/LICENSE-2.0                                                                        #
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from shared.Dataset.dataset_file import DatasetFile
from shared.config import Config
from shared.helpers import step_function_step
from shared.logging import get_logger
from shared.status import Status

logger = get_logger(__name__)


@step_function_step
def handler(event, context):
    """
    Create/ monitor Amazon Forecast forecast creation
    :param event: lambda event
    :param context: lambda context
    :return: forecast / forecast export status and forecast ARN
    """
    config = Config.from_sfn(event)
    dataset_file = DatasetFile(event.get("dataset_file"), event.get("bucket"))
    dataset_group_name = event.get("dataset_group_name")
    predictor_arn = event.get("PredictorArn")

    forecast = config.forecast(dataset_file, dataset_group_name, predictor_arn)

    if forecast.status == Status.DOES_NOT_EXIST:
        # TODO: publish predictor stats to CloudWatch prior to create
        logger.info("Creating forecast for %s" % dataset_group_name)
        forecast.create()

    return forecast.status, forecast.arn