app.py

import streamlit as st
import torch
from transformers import AutoTokenizer, AutoModelForSequenceClassification,pipeline

import requests
import json

import os

GEMINI_API_KEY = "AIzaSyBO3-HG-WcITn58PdpK7mMyvFQitoH00qA"  # Replace with your Gemini API key

GOOGLE_API_KEY = "AIzaSyAf5v5380xkpo0Rk3kBiSxpxYVBQwcDi2A"  



st.set_page_config(page_title="News Prediction", page_icon=":earth_africa:")

# Load tokenizer and model
tokenizer = AutoTokenizer.from_pretrained("hamzab/roberta-fake-news-classification")
model = AutoModelForSequenceClassification.from_pretrained("hamzab/roberta-fake-news-classification")


from deep_translator import GoogleTranslator

def translate_to_english(text):
    try:
        return GoogleTranslator(source='auto', target='en').translate(text)
    except Exception as e:
        return f"Error in translation: {e}"



def predict_fake(title, text):
    input_str = "<title>" + title + "<content>" + text + "<end>"
    input_ids = tokenizer.encode_plus(input_str, max_length=512, padding="max_length", truncation=True, return_tensors="pt")
    device = 'cuda' if torch.cuda.is_available() else 'cpu'
    model.to(device)
    with torch.no_grad():
        output = model(input_ids["input_ids"].to(device), attention_mask=input_ids["attention_mask"].to(device))
    return dict(zip(["Fake", "Real"], [x.item() for x in list(torch.nn.Softmax()(output.logits)[0])]))

def fact_check_with_google(api_key, query):
    url = f"https://factchecktools.googleapis.com/v1alpha1/claims:search"
    params = {
        "query": query,
        "key": api_key
    }
    response = requests.get(url, params=params)
    if response.status_code == 200:
        return response.json()
    else:
        return {"error": f"Unable to fetch results from Google Fact Check API. HTTP {response.status_code}: {response.text}"}


# Load summarizer
@st.cache_resource
def load_summarizer():
    return pipeline("summarization", model="facebook/bart-large-cnn")

summarizer = load_summarizer()

import google.generativeai as genai

# Initialize Gemini with your API Key
def configure_gemini(api_key):
    genai.configure(api_key=api_key)
    model = genai.GenerativeModel('gemini-2.0-flash')
    return model

# Function to extract fact-check query using Gemini
def generate_fact_check_query(model, title, text):
    prompt = f"""
You are a helpful assistant that extracts the **core claim** from news articles to be used for fact checking.

Given the **title** and **content**, provide a **single-line, specific, fact-checkable statement** that can be searched in fact-checking databases like Google's Fact Check API.

Return only the optimized query.

---
Title: {title}

Content: {text}
"""
    try:
        response = model.generate_content(prompt)
        return response.text.strip()
    except Exception as e:
        return f"Error generating query: {e}"



def main():
    st.title("Fake News Prediction")

 


    # Store your API key here or load from environment variable
    # 🔐 Replace this!

    with st.form("news_form"):
        st.subheader("Enter News Details")
        title = st.text_input("Title")
        text = st.text_area("Text")
        language = st.selectbox("Select Language", options=["English", "Other"])
        check_fact = st.checkbox("Also check with Google Fact Check API")
        submit_button = st.form_submit_button("Submit")

    if submit_button:
        if language == "Other":
            title = translate_to_english(title)
            text = translate_to_english(text)

        prediction = predict_fake(title, text)

        st.subheader("Prediction:")
        st.write("Prediction: ", prediction)

        if prediction.get("Real") > 0.5:
            st.write("This news is predicted to be **real** :muscle:")
        else:
            st.write("This news is predicted to be **fake** :shit:")



        # Use Gemini to generate a better fact-check 
    if GEMINI_API_KEY:
            gemini_model = configure_gemini(GEMINI_API_KEY)

            # ✅ Use Gemini to generate better fact-check query
            fact_query = generate_fact_check_query(gemini_model, title, text)
            st.markdown("#### 🔍 Optimized Query for Fact Check")
            st.write(fact_query)

            if check_fact:
                # ✅ Perform fact check with optimized query
                fact_check_data = fact_check_with_google(GOOGLE_API_KEY, fact_query)

                st.subheader("🧾 Google Fact Check Results")
                if "claims" in fact_check_data:
                    for claim in fact_check_data["claims"]:
                        st.markdown(f"**Claim:** {claim.get('text', 'N/A')}")
                        for review in claim.get("claimReview", []):
                            st.write(f"- **Publisher**: {review.get('publisher', {}).get('name', 'N/A')}")
                            st.write(f"- **Rating**: {review.get('textualRating', 'N/A')}")
                            st.write(f"- **URL**: {review.get('url', 'N/A')}")
                            st.write("---")
                else:
                    st.write("No fact-check results found. Try modifying the title or content.")




       
if __name__ == "__main__":
    main()