#
# Licensed to the Apache Software Foundation (ASF) under one
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# distributed with this work for additional information
# regarding copyright ownership.  The ASF licenses this file
# to you 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.
import os
import warnings
from typing import Any, Callable, Iterable, Optional, overload

import prestodb
from prestodb.exceptions import DatabaseError
from prestodb.transaction import IsolationLevel

from airflow import AirflowException
from airflow.configuration import conf
from airflow.hooks.dbapi import DbApiHook
from airflow.models import Connection


class PrestoException(Exception):
    """Presto exception"""


def _boolify(value):
    if isinstance(value, bool):
        return value
    if isinstance(value, str):
        if value.lower() == 'false':
            return False
        elif value.lower() == 'true':
            return True
    return value


class PrestoHook(DbApiHook):
    """
    Interact with Presto through prestodb.

    >>> ph = PrestoHook()
    >>> sql = "SELECT count(1) AS num FROM airflow.static_babynames"
    >>> ph.get_records(sql)
    [[340698]]
    """

    conn_name_attr = 'presto_conn_id'
    default_conn_name = 'presto_default'
    conn_type = 'presto'
    hook_name = 'Presto'

    def get_conn(self) -> Connection:
        """Returns a connection object"""
        db = self.get_connection(self.presto_conn_id)  # type: ignore[attr-defined]
        extra = db.extra_dejson
        auth = None
        if db.password and extra.get('auth') == 'kerberos':
            raise AirflowException("Kerberos authorization doesn't support password.")
        elif db.password:
            auth = prestodb.auth.BasicAuthentication(db.login, db.password)
        elif extra.get('auth') == 'kerberos':
            auth = prestodb.auth.KerberosAuthentication(
                config=extra.get('kerberos__config', os.environ.get('KRB5_CONFIG')),
                service_name=extra.get('kerberos__service_name'),
                mutual_authentication=_boolify(extra.get('kerberos__mutual_authentication', False)),
                force_preemptive=_boolify(extra.get('kerberos__force_preemptive', False)),
                hostname_override=extra.get('kerberos__hostname_override'),
                sanitize_mutual_error_response=_boolify(
                    extra.get('kerberos__sanitize_mutual_error_response', True)
                ),
                principal=extra.get('kerberos__principal', conf.get('kerberos', 'principal')),
                delegate=_boolify(extra.get('kerberos__delegate', False)),
                ca_bundle=extra.get('kerberos__ca_bundle'),
            )

        presto_conn = prestodb.dbapi.connect(
            host=db.host,
            port=db.port,
            user=db.login,
            source=db.extra_dejson.get('source', 'airflow'),
            http_scheme=db.extra_dejson.get('protocol', 'http'),
            catalog=db.extra_dejson.get('catalog', 'hive'),
            schema=db.schema,
            auth=auth,
            isolation_level=self.get_isolation_level(),  # type: ignore[func-returns-value]
        )
        if extra.get('verify') is not None:
            # Unfortunately verify parameter is available via public API.
            # The PR is merged in the presto library, but has not been released.
            # See: https://github.com/prestosql/presto-python-client/pull/31
            presto_conn._http_session.verify = _boolify(extra['verify'])

        return presto_conn

    def get_isolation_level(self) -> Any:
        """Returns an isolation level"""
        db = self.get_connection(self.presto_conn_id)  # type: ignore[attr-defined]
        isolation_level = db.extra_dejson.get('isolation_level', 'AUTOCOMMIT').upper()
        return getattr(IsolationLevel, isolation_level, IsolationLevel.AUTOCOMMIT)

    @staticmethod
    def _strip_sql(sql: str) -> str:
        return sql.strip().rstrip(';')

    @overload