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# to you under the Apache License, Version 2.0 (the
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#
#   http://www.apache.org/licenses/LICENSE-2.0
#
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import logging

from botocore.credentials import ReadOnlyCredentials

log = logging.getLogger(__name__)


def build_credentials_block(credentials: ReadOnlyCredentials) -> str:
    """
    Generate AWS credentials block for Redshift COPY and UNLOAD
    commands, as noted in AWS docs
    https://docs.aws.amazon.com/redshift/latest/dg/copy-parameters-authorization.html#copy-credentials

    :param credentials: ReadOnlyCredentials object from `botocore`
    :return: str
    """
    if credentials.token:
        log.debug("STS token found in credentials, including it in the command")
        # these credentials are obtained from AWS STS
        # so the token must be included in the CREDENTIALS clause
        credentials_line = (
            f"aws_access_key_id={credentials.access_key};"
            f"aws_secret_access_key={credentials.secret_key};"
            f"token={credentials.token}"
        )

    else:
        credentials_line = (
            f"aws_access_key_id={credentials.access_key};"
            f"aws_secret_access_key={credentials.secret_key}"
        )

    return credentials_line