import os
from typing import List, Dict, Any, Tuple
import chromadb

from src.config import CHROMA_DIR, COLLECTION_NAME

# ---------------- COLLECTION ----------------
def get_collection():
    os.makedirs(CHROMA_DIR, exist_ok=True)
    client = chromadb.PersistentClient(path=CHROMA_DIR)
    return client.get_or_create_collection(COLLECTION_NAME)

# ---------------- ADD DOCUMENTS ----------------
def add_documents(
    docs: List[str],
    embeddings: List[List[float]],
    metadatas: List[Dict[str, Any]],
    ids: List[str]
) -> None:
    col = get_collection()
    col.add(
        documents=docs,
        embeddings=embeddings,
        metadatas=metadatas,
        ids=ids
    )

# ---------------- QUERY ----------------
def query_by_embedding(
    q_embedding: List[float],
    top_k: int
) -> Tuple[List[str], List[Dict[str, Any]]]:
    col = get_collection()
    res = col.query(
        query_embeddings=[q_embedding],
        n_results=top_k,
        include=["documents", "metadatas"]
    )
    return res["documents"][0], res["metadatas"][0]

# ---------------- RESET ----------------
def reset_collection() -> None:
    os.makedirs(CHROMA_DIR, exist_ok=True)
    client = chromadb.PersistentClient(path=CHROMA_DIR)
    try:
        client.delete_collection(COLLECTION_NAME)
    except Exception:
        pass
    client.get_or_create_collection(COLLECTION_NAME)