# Example code to load and use the trained model

import torch
from transformers import AutoTokenizer, AutoModelForSequenceClassification
import json
import numpy as np

# load the saved model
model_path = "./bert_toxicity_final_model"
tokenizer = AutoTokenizer.from_pretrained(model_path)
model = AutoModelForSequenceClassification.from_pretrained(model_path)

# load configuration
with open(f"{model_path}/model_config.json", 'r') as f:
    config = json.load(f)

MAX_LENGTH = config['max_length']
THRESHOLD = config['best_threshold']

def predict_toxicity(text):
    """
    Predict toxicity for a single text input
    Returns: (is_toxic: bool, toxicity_score: float)
    """
    # tokenize
    inputs = tokenizer(
        text,
        truncation=True,
        padding=True,
        max_length=MAX_LENGTH,
        return_tensors="pt"
    )
    
    # predict
    with torch.no_grad():
        outputs = model(**inputs)
        probabilities = torch.softmax(outputs.logits, dim=1)
        toxicity_score = probabilities[0][1].item()  # probability of toxic class
        is_toxic = toxicity_score >= THRESHOLD
    
    return is_toxic, toxicity_score

# example usage
# is_toxic, score = predict_toxicity("Your text here")
# print(f"Toxic: {is_toxic}, Score: {score:.3f}")