import os


def build_postgres_uri(
    host, user, dbname, port, sslmode=None, passwd=None, params=None
):
    """Builds a PostgreSQL uri.

    See https://www.postgresql.org/docs/current/libpq-connect.html#LIBPQ-CONNSTRING for additional details.
    """

    if passwd:
        uri = f"postgresql://{user}:{passwd}@{host}:{port}/{dbname}"
    else:
        uri = f"postgresql://{user}@{host}:{port}/{dbname}"
    if sslmode:
        uri = f"{uri}?sslmode={sslmode}"
    return uri


POSTGRES_HOST = os.getenv("POSTGRES_HOST")
POSTGRES_USER = os.getenv("POSTGRES_USER")
POSTGRES_APP_DATABASE = os.getenv("POSTGRES_APP_DATABASE")
POSTGRES_PASSWORD = os.getenv("POSTGRES_PASSWORD")
POSTGRES_PORT = os.getenv("POSTGRES_PORT", default="5432")
POSTGRES_SSL_MODE = os.getenv("POSTGRES_SSL_MODE", default="prefer")
POSTGRES_PARAMS = os.getenv("POSTGRES_PARAMS")