import chromadb
from chromadb import Settings
from chromadb.utils.batch_utils import create_batches

from typing import Optional

from open_webui.apps.rag.vector.main import VectorItem, QueryResult
from open_webui.config import (
    CHROMA_DATA_PATH,
    CHROMA_HTTP_HOST,
    CHROMA_HTTP_PORT,
    CHROMA_HTTP_HEADERS,
    CHROMA_HTTP_SSL,
    CHROMA_TENANT,
    CHROMA_DATABASE,
)


class ChromaClient:
    def __init__(self):
        if CHROMA_HTTP_HOST != "":
            self.client = chromadb.HttpClient(
                host=CHROMA_HTTP_HOST,
                port=CHROMA_HTTP_PORT,
                headers=CHROMA_HTTP_HEADERS,
                ssl=CHROMA_HTTP_SSL,
                tenant=CHROMA_TENANT,
                database=CHROMA_DATABASE,
                settings=Settings(allow_reset=True, anonymized_telemetry=False),
            )
        else:
            self.client = chromadb.PersistentClient(
                path=CHROMA_DATA_PATH,
                settings=Settings(allow_reset=True, anonymized_telemetry=False),
                tenant=CHROMA_TENANT,
                database=CHROMA_DATABASE,
            )

    def list_collections(self) -> list[str]:
        collections = self.client.list_collections()
        return [collection.name for collection in collections]

    def create_collection(self, collection_name: str):
        return self.client.create_collection(name=collection_name)

    def delete_collection(self, collection_name: str):
        return self.client.delete_collection(name=collection_name)

    def search(
        self, collection_name: str, vectors: list[list[float | int]], limit: int
    ) -> Optional[QueryResult]:
        collection = self.client.get_collection(name=collection_name)
        if collection:
            result = collection.query(
                query_embeddings=vectors,
                n_results=limit,
            )

            return {
                "ids": result["ids"],
                "distances": result["distances"],
                "documents": result["documents"],
                "metadatas": result["metadatas"],
            }
        return None

    def get(self, collection_name: str) -> Optional[QueryResult]:
        collection = self.client.get_collection(name=collection_name)
        if collection:
            return collection.get()
        return None

    def insert(self, collection_name: str, items: list[VectorItem]):
        collection = self.client.get_or_create_collection(name=collection_name)

        ids = [item["id"] for item in items]
        documents = [item["text"] for item in items]
        embeddings = [item["vector"] for item in items]
        metadatas = [item["metadata"] for item in items]

        for batch in create_batches(
            api=self.client,
            documents=documents,
            embeddings=embeddings,
            ids=ids,
            metadatas=metadatas,
        ):
            collection.add(*batch)

    def upsert(self, collection_name: str, items: list[VectorItem]):
        collection = self.client.get_or_create_collection(name=collection_name)

        ids = [item["id"] for item in items]
        documents = [item["text"] for item in items]
        embeddings = [item["vector"] for item in items]
        metadata = [item["metadata"] for item in items]

        collection.upsert(
            ids=ids, documents=documents, embeddings=embeddings, metadata=metadata
        )

    def delete(self, collection_name: str, ids: list[str]):
        collection = self.client.get_collection(name=collection_name)
        if collection:
            collection.delete(ids=ids)

    def reset(self):
        return self.client.reset()