"""Embedding and vector search utilities."""

from openai import OpenAI
import numpy as np
from sklearn.metrics.pairwise import cosine_similarity
from dotenv import load_dotenv
import os

# Load environment variables
load_dotenv()

# Initialize OpenAI client with API key from environment
client = OpenAI(api_key=os.getenv("OPENAI_API_KEY"))

def get_embeddings(texts, model="text-embedding-3-small"):
    """Convert text to embedding vectors."""
    if isinstance(texts, str):
        texts = [texts]

    response = client.embeddings.create(input=texts, model=model)
    return np.array([item.embedding for item in response.data])

def vector_search(query, chunks, chunk_embeddings, top_k=3):
    """Find the most similar chunks to the query."""
    query_embedding = get_embeddings(query)
    similarities = cosine_similarity(query_embedding, chunk_embeddings)[0]
    top_indices = similarities.argsort()[::-1][:top_k]

    results = []
    for idx in top_indices:
        results.append({
            'chunk': chunks[idx],
            'similarity': similarities[idx]
        })
    return results