# Copyright 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
# SPDX-License-Identifier: MIT-0
#
# Permission is hereby granted, free of charge, to any person obtaining a copy of this
# software and associated documentation files (the "Software"), to deal in the Software
# without restriction, including without limitation the rights to use, copy, modify,
# merge, publish, distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
# INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
# PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
# HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
#
# This code expects that you have AWS credentials setup per:
# https://boto3.amazonaws.com/v1/documentation/api/latest/guide/quickstart.html
from logging import basicConfig, getLogger, INFO

from pyqldbsamples.constants import Constants
from pyqldbsamples.connect_to_ledger import create_qldb_driver

logger = getLogger(__name__)
basicConfig(level=INFO)


def create_index(driver, table_name, index_attribute):
    """
    Create an index for a particular table.

    :type driver: :py:class:`pyqldb.driver.qldb_driver.QldbDriver`
    :param driver: An instance of the QldbDriver class.

    :type table_name: str
    :param table_name: Name of the table to add indexes for.

    :type index_attribute: str
    :param index_attribute: Index to create on a single attribute.

    :rtype: int
    :return: The number of changes to the database.
    """
    logger.info("Creating index on '{}'...".format(index_attribute))
    statement = 'CREATE INDEX on {} ({})'.format(table_name, index_attribute)
    cursor = driver.execute_lambda(lambda executor: executor.execute_statement(statement))
    return len(list(cursor))


def main(ledger_name=Constants.LEDGER_NAME):
    """
    Create indexes on tables in a particular ledger.
    """
    logger.info('Creating indexes on all tables...')
    try:
        with create_qldb_driver(ledger_name) as driver:
            create_index(driver, Constants.PERSON_TABLE_NAME, Constants.GOV_ID_INDEX_NAME)
            create_index(driver, Constants.VEHICLE_TABLE_NAME, Constants.VEHICLE_VIN_INDEX_NAME)
            create_index(driver, Constants.VEHICLE_REGISTRATION_TABLE_NAME, Constants.LICENSE_PLATE_NUMBER_INDEX_NAME)
            create_index(driver, Constants.VEHICLE_REGISTRATION_TABLE_NAME, Constants.VEHICLE_VIN_INDEX_NAME)
            create_index(driver, Constants.DRIVERS_LICENSE_TABLE_NAME, Constants.PERSON_ID_INDEX_NAME)
            create_index(driver, Constants.DRIVERS_LICENSE_TABLE_NAME, Constants.LICENSE_NUMBER_INDEX_NAME)
            logger.info('Indexes created successfully.')
    except Exception as e:
        logger.exception('Unable to create indexes.')
        raise e


if __name__ == '__main__':
    main()