import os
import pandas as pd
from sentence_transformers import SentenceTransformer
import numpy as np
from tqdm import tqdm
import csv
import faiss
import requests

os.environ['TRANSFORMERS_CACHE'] = '/tmp/huggingface_cache'

# URLs of files from Hugging Face
base_url = "https://huggingface.co/datasets/manhteky123/LawVietnamese/resolve/main/"
data_url = f"{base_url}data.csv"
faiss_index_url = f"{base_url}faiss_index.bin"
vectors_url = f"{base_url}vectors.npy"

# Function to download files to disk
def download_to_disk(url, filename):
    response = requests.get(url)
    if response.status_code == 200:
        with open(filename, 'wb') as f:
            f.write(response.content)
        print(f"Downloaded {url} to {filename}.")
    else:
        raise Exception(f"Failed to download {url}: {response.status_code}")

# Download the necessary files to disk
data_file_path = 'data.csv'
faiss_index_file_path = 'faiss_index.bin'
vectors_file_path = 'vectors.npy'

download_to_disk(data_url, data_file_path)
download_to_disk(faiss_index_url, faiss_index_file_path)
download_to_disk(vectors_url, vectors_file_path)

# Read the CSV data from the downloaded file
df = pd.read_csv(data_file_path)

# Use the 'truncated_text' column
column_name = 'truncated_text'

# Load SentenceTransformer
model = SentenceTransformer('intfloat/multilingual-e5-small')

# Read FAISS index from file
index = faiss.read_index(faiss_index_file_path)

# Load vectors
vectors = np.load(vectors_file_path)

def retrieve_documents(query, k=5, threshold=0.7):
    query_vector = model.encode([query], convert_to_tensor=True).cpu().numpy()
    D, I = index.search(query_vector, k)
    similarities = 1 / (1 + D[0])
    filtered_documents = []
    for i, similarity in enumerate(similarities):
        if similarity >= threshold:
            filtered_documents.append(df.iloc[I[0][i]][column_name])
    return filtered_documents