from typing import TYPE_CHECKING, Generic, List, Optional, Union

from weaviate.collections.batch.base import (
    _BatchBase,
    _BatchDataWrapper,
    _BatchMode,
    _DynamicBatching,
    _FixedSizeBatching,
    _RateLimitedBatching,
)
from weaviate.collections.batch.batch_wrapper import _BatchWrapper, _ContextManagerWrapper
from weaviate.collections.classes.config import ConsistencyLevel, Vectorizers
from weaviate.collections.classes.internal import ReferenceInputs, ReferenceInput
from weaviate.collections.classes.types import Properties
from weaviate.connect import ConnectionV4
from weaviate.exceptions import UnexpectedStatusCodeError
from weaviate.types import UUID, VECTORS

if TYPE_CHECKING:
    from weaviate.collections.config import _ConfigCollection


class _BatchCollection(Generic[Properties], _BatchBase):
    def __init__(
        self,
        connection: ConnectionV4,
        consistency_level: Optional[ConsistencyLevel],
        results: _BatchDataWrapper,
        batch_mode: _BatchMode,
        name: str,
        tenant: Optional[str],
        vectorizer_batching: bool,
    ) -> None:
        super().__init__(
            connection=connection,
            consistency_level=consistency_level,
            results=results,
            batch_mode=batch_mode,
            vectorizer_batching=vectorizer_batching,
        )
        self.__name = name
        self.__tenant = tenant

    def add_object(
        self,
        properties: Optional[Properties] = None,
        references: Optional[ReferenceInputs] = None,
        uuid: Optional[UUID] = None,
        vector: Optional[VECTORS] = None,
    ) -> UUID:
        """Add one object to this batch.

        NOTE: If the UUID of one of the objects already exists then the existing object will be replaced by the new object.

        Arguments:
            `properties`
                The data properties of the object to be added as a dictionary.
            `references`
                The references of the object to be added as a dictionary.
            `uuid`:
                The UUID of the object as an uuid.UUID object or str. If it is None an UUIDv4 will generated, by default None
            `vector`:
                The embedding of the object. Can be used when a collection does not have a vectorization module or the given
                vector was generated using the _identical_ vectorization module that is configured for the class. In this
                case this vector takes precedence.
                Supported types are
                - for single vectors: `list`, 'numpy.ndarray`, `torch.Tensor` and `tf.Tensor`, by default None.
                - for named vectors: Dict[str, *list above*], where the string is the name of the vector.

        Returns:
            `str`
                The UUID of the added object. If one was not provided a UUIDv4 will be auto-generated for you and returned here.

        Raises:
            `WeaviateBatchValidationError`
                If the provided options are in the format required by Weaviate.
        """
        return self._add_object(
            collection=self.__name,
            properties=properties,
            references=references,
            uuid=uuid,
            vector=vector,
            tenant=self.__tenant,
        )

    def add_reference(
        self, from_uuid: UUID, from_property: str, to: Union[ReferenceInput, List[UUID]]
    ) -> None:
        """Add a reference to this batch.

        Arguments:
            `from_uuid`
                The UUID of the object, as an uuid.UUID object or str, that should reference another object.
            `from_property`
                The name of the property that contains the reference.
            `to`
                The UUID of the referenced object, as an uuid.UUID object or str, that is actually referenced.
                For multi-target references use wvc.Reference.to_multi_target().

        Raises:
            `WeaviateBatchValidationError`
                If the provided options are in the format required by Weaviate.
        """
        self._add_reference(
            from_uuid,
            self.__name,
            from_property,
            to,
            self.__tenant,
        )


class _BatchCollectionWrapper(Generic[Properties], _BatchWrapper):
    def __init__(
        self,
        connection: ConnectionV4,
        consistency_level: Optional[ConsistencyLevel],
        name: str,
        tenant: Optional[str],
        config: "_ConfigCollection",
    ) -> None:
        super().__init__(connection, consistency_level)
        self.__name = name
        self.__tenant = tenant
        self.__config = config
        self._vectorizer_batching: Optional[bool] = None

    def __create_batch_and_reset(self) -> _ContextManagerWrapper[_BatchCollection[Properties]]:
        if self._vectorizer_batching is None:
            try:
                config = self.__config.get(simple=True)
                if config.vector_config is not None:
                    vectorizer_batching = False
                    for vec_config in config.vector_config.values():
                        if vec_config.vectorizer.vectorizer is not Vectorizers.NONE:
                            vectorizer_batching = True
                            break
                    self._vectorizer_batching = vectorizer_batching
                else:
                    self._vectorizer_batching = config.vectorizer is not Vectorizers.NONE
            except UnexpectedStatusCodeError as e:
                # collection does not have to exist if autoschema is enabled. Individual objects will be validated and might fail
                if e.status_code != 404:
                    raise e
                self._vectorizer_batching = False

        self._batch_data = _BatchDataWrapper()  # clear old data
        return _ContextManagerWrapper(
            _BatchCollection[Properties](
                connection=self._connection,
                consistency_level=self._consistency_level,
                results=self._batch_data,
                batch_mode=self._batch_mode,
                name=self.__name,
                tenant=self.__tenant,
                vectorizer_batching=self._vectorizer_batching,
            )
        )

    def dynamic(self) -> _ContextManagerWrapper[_BatchCollection[Properties]]:
        """Configure dynamic batching.

        When you exit the context manager, the final batch will be sent automatically.
        """
        self._batch_mode: _BatchMode = _DynamicBatching()
        return self.__create_batch_and_reset()

    def fixed_size(
        self, batch_size: int = 100, concurrent_requests: int = 2
    ) -> _ContextManagerWrapper[_BatchCollection[Properties]]:
        """Configure fixed size batches. Note that the default is dynamic batching.

        When you exit the context manager, the final batch will be sent automatically.

        Arguments:
            `batch_size`
                The number of objects/references to be sent in one batch. If not provided, the default value is 100.
            `concurrent_requests`
                The number of concurrent requests when sending batches. This controls the number of concurrent requests
                made to Weaviate and not the speed of batch creation within Python.
        """
        self._batch_mode = _FixedSizeBatching(batch_size, concurrent_requests)
        return self.__create_batch_and_reset()

    def rate_limit(
        self, requests_per_minute: int
    ) -> _ContextManagerWrapper[_BatchCollection[Properties]]:
        """Configure batches with a rate limited vectorizer.

        When you exit the context manager, the final batch will be sent automatically.

        Arguments:
            `requests_per_minute`
                The number of requests that the vectorizer can process per minute.
        """
        self._batch_mode = _RateLimitedBatching(requests_per_minute)
        return self.__create_batch_and_reset()
