webapp.py

import os
import gradio as gr
from google import genai
from google.genai.types import GenerateContentConfig, GoogleSearch, Tool

# Initialize GenAI Client
API_KEY = os.getenv("GOOGLE_API_KEY")  # Set in Hugging Face Secrets
client = genai.Client(api_key=API_KEY)
MODEL_ID = "gemini-2.0-flash"

# Custom Pink CSS
pink_css = """
.gradio-container {
    background: linear-gradient(135deg, #ffe4ec, #fff0f6);
}

button {
    background-color: #ec4899 !important;
    color: white !important;
    border-radius: 14px !important;
    font-weight: bold;
}

button:hover {
    background-color: #db2777 !important;
}

textarea, input {
    border: 2px solid #f472b6 !important;
    border-radius: 10px !important;
}
"""

def fact_check_claim(claim, use_web_search):
    try:
        prompt = f"""
You are a professional fact-checking assistant.

Classify the following claim as one of:
- True
- False
- Misleading
- Unverifiable

Then provide a short explanation.

Claim:
{claim}
"""

        # Base AI analysis
        response = client.models.generate_content(
            model=MODEL_ID,
            contents=prompt,
        )
        verdict = response.text

        if use_web_search:
            google_search_tool = Tool(google_search=GoogleSearch())
            response = client.models.generate_content(
                model=MODEL_ID,
                contents=prompt,
                config=GenerateContentConfig(tools=[google_search_tool]),
            )
            evidence = response.candidates[0].grounding_metadata.search_entry_point.rendered_content
        else:
            evidence = "Web evidence was not requested."

        return verdict, evidence

    except Exception as e:
        return f"Error: {str(e)}", ""

# Gradio UI
with gr.Blocks(
    theme=gr.themes.Soft(
        primary_hue="pink",
        secondary_hue="rose",
        radius_size="lg",
    ),
    css=pink_css
) as app:

    gr.Markdown("# AI Fact Checker (Gemini 2.0)")

    with gr.Row():
        chatbot = gr.Chatbot(label="Fact-Checking History", height=350)

    with gr.Row():
        claim_input = gr.Textbox(
            lines=3,
            label="Enter a claim to verify",
            placeholder="Example: Vitamin C prevents colds."
        )
        web_search_checkbox = gr.Checkbox(
            label="Verify with Web Evidence",
            value=True
        )

    with gr.Row():
        submit_button = gr.Button("Check Claim 🔍")

    def update_chatbot(claim, use_web_search, chat_log):
        verdict, evidence = fact_check_claim(claim, use_web_search)
        chat_log.append(("Claim", claim))
        chat_log.append(("AI Verdict", verdict))
        if use_web_search:
            chat_log.append(("Evidence", evidence))
        return chat_log

    submit_button.click(
        fn=update_chatbot,
        inputs=[claim_input, web_search_checkbox, chatbot],
        outputs=[chatbot],
    )

app.launch()