import uuid
from abc import ABC
from typing import Any, Callable, Dict, Generic, Type, TypeVar
from uuid import UUID

import numpy as np
from loguru import logger
from pydantic import UUID4, BaseModel, Field
from qdrant_client.http import exceptions
from qdrant_client.http.models import Distance, VectorParams
from qdrant_client.models import CollectionInfo, PointStruct, Record


from rag_demo.infra.qdrant import connection

T = TypeVar("T", bound="VectorBaseDocument")

EMBEDDING_SIZE = 1024


class VectorBaseDocument(BaseModel, Generic[T], ABC):
    id: UUID4 = Field(default_factory=uuid.uuid4)

    def __eq__(self, value: object) -> bool:
        if not isinstance(value, self.__class__):
            return False

        return self.id == value.id

    def __hash__(self) -> int:
        return hash(self.id)

    @classmethod
    def from_record(cls: Type[T], point: Record) -> T:
        _id = UUID(point.id, version=4)
        payload = point.payload or {}

        attributes = {
            "id": _id,
            **payload,
        }
        if cls._has_class_attribute("embedding"):
            attributes["embedding"] = point.vector or None

        return cls(**attributes)

    def to_point(self: T, **kwargs) -> PointStruct:
        exclude_unset = kwargs.pop("exclude_unset", False)
        by_alias = kwargs.pop("by_alias", True)

        payload = self.model_dump(
            exclude_unset=exclude_unset, by_alias=by_alias, **kwargs
        )

        _id = str(payload.pop("id"))
        vector = payload.pop("embedding", {})
        if vector and isinstance(vector, np.ndarray):
            vector = vector.tolist()

        return PointStruct(id=_id, vector=vector, payload=payload)

    def model_dump(self: T, **kwargs) -> dict:
        dict_ = super().model_dump(**kwargs)

        dict_ = self._uuid_to_str(dict_)

        return dict_

    def _uuid_to_str(self, item: Any) -> Any:
        if isinstance(item, dict):
            for key, value in item.items():
                if isinstance(value, UUID):
                    item[key] = str(value)
                elif isinstance(value, list):
                    item[key] = [self._uuid_to_str(v) for v in value]
                elif isinstance(value, dict):
                    item[key] = {k: self._uuid_to_str(v) for k, v in value.items()}

        return item

    @classmethod
    def bulk_insert(cls: Type[T], documents: list["VectorBaseDocument"]) -> bool:
        try:
            cls._bulk_insert(documents)
            logger.info(
                f"Successfully inserted {len(documents)} documents into {cls.get_collection_name()}"
            )

        except Exception as e:
            logger.error(f"Error inserting documents: {e}")
            logger.info(
                f"Collection '{cls.get_collection_name()}' does not exist. Trying to create the collection and reinsert the documents."
            )

            cls.create_collection()

            try:
                cls._bulk_insert(documents)
            except Exception as e:
                logger.error(f"Error inserting documents: {e}")
                logger.error(
                    f"Failed to insert documents in '{cls.get_collection_name()}'."
                )

                return False

        return True

    @classmethod
    def _bulk_insert(cls: Type[T], documents: list["VectorBaseDocument"]) -> None:
        points = [doc.to_point() for doc in documents]

        connection.upsert(collection_name=cls.get_collection_name(), points=points)

    @classmethod
    def bulk_find(
        cls: Type[T], limit: int = 10, **kwargs
    ) -> tuple[list[T], UUID | None]:
        try:
            documents, next_offset = cls._bulk_find(limit=limit, **kwargs)
        except exceptions.UnexpectedResponse:
            logger.error(
                f"Failed to search documents in '{cls.get_collection_name()}'."
            )

            documents, next_offset = [], None

        return documents, next_offset

    @classmethod
    def _bulk_find(
        cls: Type[T], limit: int = 10, **kwargs
    ) -> tuple[list[T], UUID | None]:
        collection_name = cls.get_collection_name()

        offset = kwargs.pop("offset", None)
        offset = str(offset) if offset else None

        records, next_offset = connection.scroll(
            collection_name=collection_name,
            limit=limit,
            with_payload=kwargs.pop("with_payload", True),
            with_vectors=kwargs.pop("with_vectors", False),
            offset=offset,
            **kwargs,
        )
        documents = [cls.from_record(record) for record in records]
        if next_offset is not None:
            next_offset = UUID(next_offset, version=4)

        return documents, next_offset

    @classmethod
    def search(cls: Type[T], query_vector: list, limit: int = 10, **kwargs) -> list[T]:
        try:
            documents = cls._search(query_vector=query_vector, limit=limit, **kwargs)
        except exceptions.UnexpectedResponse:
            logger.error(
                f"Failed to search documents in '{cls.get_collection_name()}'."
            )

            documents = []

        return documents

    @classmethod
    def _search(cls: Type[T], query_vector: list, limit: int = 10, **kwargs) -> list[T]:
        collection_name = cls.get_collection_name()
        records = connection.search(
            collection_name=collection_name,
            query_vector=query_vector,
            limit=limit,
            with_payload=kwargs.pop("with_payload", True),
            with_vectors=kwargs.pop("with_vectors", False),
            **kwargs,
        )
        documents = [cls.from_record(record) for record in records]

        return documents

    @classmethod
    def get_or_create_collection(cls: Type[T]) -> CollectionInfo:
        collection_name = cls.get_collection_name()

        try:
            return connection.get_collection(collection_name=collection_name)
        except exceptions.UnexpectedResponse:
            use_vector_index = cls.get_use_vector_index()

            collection_created = cls._create_collection(
                collection_name=collection_name, use_vector_index=use_vector_index
            )
            if collection_created is False:
                raise RuntimeError(
                    f"Couldn't create collection {collection_name}"
                ) from None

            return connection.get_collection(collection_name=collection_name)

    @classmethod
    def create_collection(cls: Type[T]) -> bool:
        collection_name = cls.get_collection_name()
        use_vector_index = cls.get_use_vector_index()
        logger.info(
            f"Creating collection {collection_name} with use_vector_index={use_vector_index}"
        )
        return cls._create_collection(
            collection_name=collection_name, use_vector_index=use_vector_index
        )

    @classmethod
    def _create_collection(
        cls, collection_name: str, use_vector_index: bool = True
    ) -> bool:
        if use_vector_index is True:
            vectors_config = VectorParams(size=EMBEDDING_SIZE, distance=Distance.COSINE)
        else:
            vectors_config = {}

        return connection.create_collection(
            collection_name=collection_name, vectors_config=vectors_config
        )

    @classmethod
    def get_collection_name(cls: Type[T]) -> str:
        if not hasattr(cls, "Config") or not hasattr(cls.Config, "name"):
            raise Exception(
                f"The class {cls} should define a Config class with the 'name' property that reflects the collection's name."
            )

        return cls.Config.name

    @classmethod
    def get_use_vector_index(cls: Type[T]) -> bool:
        if not hasattr(cls, "Config") or not hasattr(cls.Config, "use_vector_index"):
            return True

        return cls.Config.use_vector_index

    @classmethod
    def group_by_class(
        cls: Type["VectorBaseDocument"], documents: list["VectorBaseDocument"]
    ) -> Dict["VectorBaseDocument", list["VectorBaseDocument"]]:
        return cls._group_by(documents, selector=lambda doc: doc.__class__)

    @classmethod
    def _group_by(
        cls: Type[T], documents: list[T], selector: Callable[[T], Any]
    ) -> Dict[Any, list[T]]:
        grouped = {}
        for doc in documents:
            key = selector(doc)

            if key not in grouped:
                grouped[key] = []
            grouped[key].append(doc)

        return grouped

    @classmethod
    def collection_name_to_class(
        cls: Type["VectorBaseDocument"], collection_name: str
    ) -> type["VectorBaseDocument"]:
        for subclass in cls.__subclasses__():
            try:
                if subclass.get_collection_name() == collection_name:
                    return subclass
            except Exception:
                pass

            try:
                return subclass.collection_name_to_class(collection_name)
            except ValueError:
                continue

        raise ValueError(f"No subclass found for collection name: {collection_name}")

    @classmethod
    def _has_class_attribute(cls: Type[T], attribute_name: str) -> bool:
        if attribute_name in cls.__annotations__:
            return True

        for base in cls.__bases__:
            if hasattr(base, "_has_class_attribute") and base._has_class_attribute(
                attribute_name
            ):
                return True

        return False