app/utils/prediction.py

import torch
from collections import OrderedDict
from transformers import BertTokenizer, BertForSequenceClassification
import os

HF_TOKEN = os.getenv("HF_TOKEN")

# Load the pre-trained model and tokenizer
tokenizer = BertTokenizer.from_pretrained("Maulidaaa/bert-safe-model", token=HF_TOKEN)
model = BertForSequenceClassification.from_pretrained("Maulidaaa/bert-safe-model", token=HF_TOKEN)

def predict(desc):
    if not desc:
        return "Not Safe"
    inputs = tokenizer(desc, return_tensors="pt", truncation=True, padding=True, max_length=512)
    with torch.no_grad():
        outputs = model(**inputs)
    logits = outputs.logits
    pred = torch.argmax(logits, dim=1).item()
    return "Safe" if pred == 1 else "Not Safe"

def predict_with_description(ingredient, df):
    df_match = df.copy()
    df_match['INCI name_lower'] = df_match['INCI name'].str.lower()
    df_match['IUPAC Name_lower'] = df_match['IUPAC Name'].str.lower()

    ingredient_lower = ingredient.lower()
    match_row = df_match[(df_match['INCI name_lower'] == ingredient_lower) | (df_match['IUPAC Name_lower'] == ingredient_lower)]

    if not match_row.empty:
        row = match_row.iloc[0]
        inci_name = row['INCI name'].title()
        desc = row.get('Description', '')
        func = row.get('Function', '')
        Restriction = row.get('Restriction')
        risk_lvl = row.get('Risk Level', '')
        risk_desc = row.get('Risk Description', '')
    else:
        inci_name = ingredient.title()
        desc = "Description not found"
        func = "Function not found"
        Restriction = "Restriction not found"
        risk_lvl = "Unknown"
        risk_desc = "Risk info not available"

    result = predict(desc)

    return OrderedDict([
        ("Ingredient Name", inci_name),
        ("Description", desc),
        ("Function", func),
        ("Risk Level", risk_lvl),
        ("Restriction", Restriction),  # ✅ This line fixed
        ("Risk Description", risk_desc),
        ("Prediction", result)
    ])