# copyright (c) 2024 PaddlePaddle Authors. All Rights Reserve.
#
# 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.

from abc import ABC, abstractmethod
from .....utils.subclass_register import AutoRegisterABCMetaClass

import inspect
import base64


class BaseRetriever(ABC, metaclass=AutoRegisterABCMetaClass):
    """Base Retriever"""

    __is_base = True

    VECTOR_STORE_PREFIX = "PADDLEX_VECTOR_STORE"

    def __init__(self):
        super().__init__()

    @abstractmethod
    def generate_vector_database(self):
        raise NotImplementedError(
            "The method `generate_vector_database` has not been implemented yet."
        )

    @abstractmethod
    def similarity_retrieval(self):
        raise NotImplementedError(
            "The method `similarity_retrieval` has not been implemented yet."
        )

    def is_vector_store(self, s):
        return s.startswith(self.VECTOR_STORE_PREFIX)

    def encode_vector_store(self, vector_store_bytes):
        return self.VECTOR_STORE_PREFIX + base64.b64encode(vector_store_bytes).decode(
            "ascii"
        )

    def decode_vector_store(self, vector_store_str):
        return base64.b64decode(vector_store_str[len(self.VECTOR_STORE_PREFIX) :])