import gradio as gr
import json
import numpy as np
from sentence_transformers import SentenceTransformer
from sklearn.neighbors import NearestNeighbors

# Load model and data
model = SentenceTransformer('models/ad_categorizer')
with open('data/listings.json') as f:
    listings = json.load(f)

# Prepare embeddings
texts = [item['text'] for item in listings]
embeddings = model.encode(texts)
categories = [item['category'] for item in listings]

# Create search index
nn = NearestNeighbors(n_neighbors=1).fit(embeddings)

def categorize(text):
    # Encode query
    query_embedding = model.encode(text)
    
    # Find nearest match
    _, indices = nn.kneighbors([query_embedding])
    best_match = listings[indices[0][0]]
    
    return {
        "category": best_match['category'],
        "category_id": best_match['category_id'],
        "similar_listing": best_match['text']
    }

# Gradio interface
demo = gr.Interface(
    fn=categorize,
    inputs=gr.Textbox(label="Ad Listing"),
    outputs=gr.JSON(label="Prediction"),
    examples=json.load(open('data/test_cases.json'))
)

demo.launch()