# Copyright 2024 Google LLC
#
# 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
#
#   https://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.

import ssl
from typing import Any, TYPE_CHECKING

SERVER_PROXY_PORT = 5433

if TYPE_CHECKING:
    import asyncpg


async def connect(
    ip_address: str, ctx: ssl.SSLContext, **kwargs: Any
) -> "asyncpg.Connection":
    """Helper function to create an asyncpg DB-API connection object.

    :type ip_address: str
    :param ip_address: A string containing an IP address for the AlloyDB
        instance.

    :type ctx: ssl.SSLContext
    :param ctx: An SSLContext object created from the AlloyDB server CA
        cert and ephemeral cert.

    :type kwargs: Any
    :param kwargs: Keyword arguments for establishing asyncpg connection
        object to AlloyDB instance.

    :rtype: asyncpg.Connection
    :returns: An asyncpg.Connection object to an AlloyDB instance.
    """
    try:
        import asyncpg
    except ImportError:
        raise ImportError(
            'Unable to import module "asyncpg." Please install and try again.'
        )
    user = kwargs.pop("user")
    db = kwargs.pop("db")
    passwd = kwargs.pop("password")

    return await asyncpg.connect(
        user=user,
        database=db,
        password=passwd,
        host=ip_address,
        port=SERVER_PROXY_PORT,
        ssl=ctx,
        direct_tls=True,
        **kwargs,
    )