import gradio as gr 

def extract_text_from_pdf(file):
    return None

def generate_multiple_choice_question(text):
    # Placeholder function to simulate question generation
    question = "What is the capital of France?"
    option_a = "Berlin"
    option_b = "Paris"
    correct_option = "b"
    explanation = "Paris is the capital and most populous city of France."
    return {
        "question": question,
        "option_a": option_a,
        "option_b": option_b,
        "correct_option": correct_option,
        "explanation": explanation
    }

def check_answer(selected_option, correct_option, explanation):
    success = selected_option == correct_option
    result_text = f"Correct! {explanation}" if success else f"Incorrect. {explanation}"
    return result_text, success

def main(pdf_file):
    text = extract_text_from_pdf(pdf_file)
    mcq = generate_multiple_choice_question(text)
    question = mcq["question"]
    option_a = mcq["option_a"]
    option_b = mcq["option_b"]
    correct_option = mcq["correct_option"]
    explanation = mcq["explanation"]
    
    return question, option_a, option_b, correct_option, explanation

with gr.Blocks() as demo:
    pdf_file = gr.File(label="Upload PDF", file_types=["pdf"])
    question = gr.Textbox(label="Generated Question", interactive=False)
    option_a = gr.Textbox(label="Option A", interactive=False)
    option_b = gr.Textbox(label="Option B", interactive=False)
    selected_option = gr.Radio(choices=["a", "b"], label="Select your answer")
    result = gr.Textbox(label="Result", interactive=False)
    
    def process(pdf_file):
        q, a, b, correct, expl = main(pdf_file)
        return q, a, b, correct, expl

    def evaluate(selected_option, correct_option, explanation):
        result_text, success = check_answer(selected_option, correct_option, explanation)
        return result_text

    process_button = gr.Button("Generate Question")
    evaluate_button = gr.Button("Submit Answer")

    process_button.click(fn=process, inputs=[pdf_file], outputs=[question, option_a, option_b, selected_option, result])
    evaluate_button.click(fn=evaluate, inputs=[selected_option, selected_option, result], outputs=result)

demo.launch()