import json
import numpy as np
from langchain.schema import Document
import faiss

from data_processing import embedding_model #, index, actual_docs

retrieved_docs = None

# Retrieval Function
def retrieve_documents(query, top_k=5):
    faiss_index_path = f"data_local/rag7_index.faiss"
    index = faiss.read_index(faiss_index_path)

    query_embedding = np.array(embedding_model.embed_documents([query]), dtype=np.float32)

    _, nearest_indices = index.search(query_embedding, top_k)

    with open(f"data_local/rag7_docs.json", "r") as f:
        documents = json.load(f)  # Contains all documents for this dataset

    retrieved_docs = [Document(page_content=documents[i]) for i in nearest_indices[0]]

    return retrieved_docs


def remove_duplicate_documents(documents):
    unique_documents = []
    seen_documents = set()  # To keep track of seen documents
    for doc in documents:
        # Using the page_content as a unique identifier for deduplication
        doc_content = doc.page_content
        if doc_content not in seen_documents:
            unique_documents.append(doc)
            seen_documents.add(doc_content)
    return unique_documents