app.py

import gradio as gr
import uuid, os, tempfile, hashlib
from reportlab.lib.pagesizes import A5, landscape
from reportlab.pdfgen import canvas
from reportlab.lib.units import mm
from reportlab.lib.colors import HexColor
from datetime import datetime

# Certificate generation function (included for a self-contained script)
def generate_certificate(name, score, total, instructor="Sudhir Gupta"):
    unique_id = str(uuid.uuid4())
    filename = f"cert_{unique_id}.pdf"
    filepath = os.path.join(tempfile.gettempdir(), filename)
    c = canvas.Canvas(filepath, pagesize=landscape(A5))
    width, height = landscape(A5)
    c.setFillColor(HexColor("#fffdf6"))
    c.rect(0, 0, width, height, stroke=0, fill=1)
    c.setStrokeColor(HexColor("#001858"))
    c.setLineWidth(3)
    margin = 10 * mm
    c.rect(margin, margin, width - 2 * margin, height - 2 * margin)
    c.setFillColor(HexColor("#001858"))
    c.setFont("Helvetica-Bold", 24)
    c.drawCentredString(width / 2, height - 60, "Certificate of Completion")
    c.setFont("Helvetica", 14)
    c.drawCentredString(width / 2, height - 100, "This is awarded to")
    c.setFont("Helvetica-Bold", 18)
    c.drawCentredString(width / 2, height - 130, name)
    c.setFont("Helvetica", 14)
    c.drawCentredString(width / 2, height - 160, "For successfully completing the quiz - Our Solar System")
    c.setFont("Helvetica", 12)
    c.drawCentredString(width / 2, height - 185, f"Score: {score} / {total}")
    c.setFont("Helvetica-Oblique", 10)
    c.drawString(margin + 10, margin + 20, f"Instructor: {instructor}")
    date_str = datetime.now().strftime("%d %B %Y")
    c.setFont("Helvetica", 10)
    c.drawRightString(width - margin - 10, margin + 20, f"Issued on: {date_str}")
    c.save()
    return filepath

# Quiz data (answers are hashed)
quiz_type = "Multiple Choice"
questions = [{'question': 'What is the name of the star at the center of our solar system?', 'options': ['The Moon', 'The Sun', 'Mars', 'The Milky Way'], 'answer_hash': 'f99f996daf45ff7005d515a01538d792c7449aa121b7469b8f52d426f3185613'}, {'question': 'Which planet is known as the "Red Planet"?', 'options': ['Jupiter', 'Venus', 'Saturn', 'Mars'], 'answer_hash': 'd158be41db87d7055fa9548fe9c0e3cb685983fedb4f2d648d7a25c046d72d9d'}, {'question': 'What are the large beautiful rings of Saturn made of?', 'options': ['Solid rock', 'Dust and gas', 'Ice and rock', 'Liquid water'], 'answer_hash': 'c14f48114ce9363f80b4e33f8c523c25e2422a14d68c976832a75e47b2d12a1c'}, {'question': 'Which is the largest planet in our solar system?', 'options': ['Jupiter', 'Earth', 'Mercury', 'Saturn'], 'answer_hash': '1e9cc37678c0112d7a394909256c2a5998a6e57e2b0d82209900e1456e51b7eb'}, {'question': 'How many planets are in our solar system?', 'options': ['7', '8', '9', '10'], 'answer_hash': '2c624232cdd221771294dfbb310aca000a0df6ac8b66b696d90ef06fdefb64a3'}, {'question': 'Which planet is closest to the Sun?', 'options': ['Venus', 'Mercury', 'Earth', 'Mars'], 'answer_hash': 'b769a6983b42d565e79bb4f3f534623453f301d39784e57804a649a67ea05327'}, {'question': 'What is the name of the natural satellite that orbits the Earth?', 'options': ['Phobos', 'The Sun', 'The Moon', 'A comet'], 'answer_hash': '7bcd0f182d906d8e5c1dfbe656720d51d545da8f491f35da2c627badb29731cf'}, {'question': 'Which planet is known for its beautiful rings?', 'options': ['Saturn', 'Uranus', 'Neptune', 'Jupiter'], 'answer_hash': 'b988b5837c24ad1987f31266e0246b0fdaaf7948714cfa2a9f7757c52977ff14'}, {'question': 'What is the name of the third planet from the Sun?', 'options': ['Mercury', 'Mars', 'Earth', 'Jupiter'], 'answer_hash': '7b74b418a352d67108173c20c1b16b4b726bad8606be65711ff924dbf9a40670'}, {'question': 'The path a planet takes around the Sun is called an:', 'options': ['Axis', 'Rotation', 'Orbit', 'Revolution'], 'answer_hash': '4fa1a13ac468ac495f3390e859d76d5e8ef49806815b45a21de7711bcc624194'}]

def eval_quiz(name, *answers):
    """
    Evaluates the student's answers and generates a certificate only if the score is 80% or higher.
    """
    if not name.strip():
        name = "Anonymous"
    score = 0
    for i, ans in enumerate(answers):
        if ans and hashlib.sha256(str(ans).lower().strip().encode()).hexdigest() == questions[i]["answer_hash"]:
            score += 1
    
    total_questions = len(questions)
    passing_threshold = 0.8
    
    result_message = f"Hi {name}, your score is: {score} / {total_questions}."
    cert_path = None # Default to no certificate

    # Check if the score meets the passing threshold
    if total_questions > 0 and (score / total_questions) >= passing_threshold:
        cert_path = generate_certificate(name, score, total_questions, instructor="Sudhir Gupta")
        result_message += " Congratulations, you passed and earned a certificate!"
    else:
        result_message += " A score of 80% is required to receive a certificate."

    return result_message, cert_path

# Gradio interface for the student
with gr.Blocks(theme=gr.themes.Soft()) as app:
    gr.Markdown("## Our Solar System")
    
    with gr.Row():
        name = gr.Textbox(label="Enter Your Full Name to Generate Certificate", placeholder="e.g., Ada Lovelace")

    answer_inputs = []
    for q in questions:
        gr.Markdown("**Question:** " + q['question'])
        if quiz_type == "Multiple Choice":
            answer_inputs.append(gr.Radio(choices=q["options"], label="Select your answer"))
        else:
            answer_inputs.append(gr.Textbox(label="Type your answer"))

    submit_btn = gr.Button("Submit Quiz")
    
    with gr.Row():
        result_output = gr.Textbox(label="Your Result")
        certificate_output = gr.File(label="Download Your Certificate")

    submit_btn.click(
        fn=eval_quiz, 
        inputs=[name] + answer_inputs, 
        outputs=[result_output, certificate_output]
    )

app.launch(debug=True)