# Copyright 2019 Google Inc. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""SQL Queries for fetching data from BigQuery."""

from . import features


def get_query(table, limit=None):
    """Returns BigQuery Standard SQL query to fetch the data.

    Args:
        table: BigQuery table name in dataset.table format.
        limit: Limit query results by this amount
    """

    fields = ',\n    '.join(features.BQ_FEATURES)

    if limit and limit >= 0:
        limit_clause = 'LIMIT {}'.format(limit)
    else:
        limit_clause = ''

    return """
    SELECT
        {fields}
    FROM
        `{table}`
    WHERE
        totals.transactions > 0
    {limit}
    """.format(
        fields=fields,
        table=table,
        limit=limit_clause
    )
