"""
Copyright 2024, Zep Software, Inc.

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.
"""

import copy
import logging
from abc import ABC, abstractmethod
from collections.abc import Coroutine
from enum import Enum
from typing import Any

logger = logging.getLogger(__name__)


class GraphProvider(Enum):
    NEO4J = 'neo4j'
    FALKORDB = 'falkordb'


class GraphDriverSession(ABC):
    async def __aenter__(self):
        return self

    @abstractmethod
    async def __aexit__(self, exc_type, exc, tb):
        # No cleanup needed for Falkor, but method must exist
        pass

    @abstractmethod
    async def run(self, query: str, **kwargs: Any) -> Any:
        raise NotImplementedError()

    @abstractmethod
    async def close(self):
        raise NotImplementedError()

    @abstractmethod
    async def execute_write(self, func, *args, **kwargs):
        raise NotImplementedError()


class GraphDriver(ABC):
    provider: GraphProvider
    fulltext_syntax: str = (
        ''  # Neo4j (default) syntax does not require a prefix for fulltext queries
    )
    _database: str

    @abstractmethod
    def execute_query(self, cypher_query_: str, **kwargs: Any) -> Coroutine:
        raise NotImplementedError()

    @abstractmethod
    def session(self, database: str | None = None) -> GraphDriverSession:
        raise NotImplementedError()

    @abstractmethod
    def close(self):
        raise NotImplementedError()

    @abstractmethod
    def delete_all_indexes(self) -> Coroutine:
        raise NotImplementedError()

    def with_database(self, database: str) -> 'GraphDriver':
        """
        Returns a shallow copy of this driver with a different default database.
        Reuses the same connection (e.g. FalkorDB, Neo4j).
        """
        cloned = copy.copy(self)
        cloned._database = database

        return cloned