Quiz App with ShinyLive

questions = [
    {
        "question": "What is the capital of France?",
        "choices": ["Paris", "Rome", "Berlin", "Madrid"],
        "answer": "Paris"
    },
    {
        "question": "Which planet is closest to the sun?",
        "choices": ["Venus", "Earth", "Mercury", "Mars"],
        "answer": "Mercury"
    },
    {
        "question": "What is the largest mammal?",
        "choices": ["Elephant", "Blue Whale", "Giraffe", "Tiger"],
        "answer": "Blue Whale"
    }
]

#| '!! shinylive warning !!': |
#|   shinylive does not work in self-contained HTML documents.
#|   Please set `embed-resources: false` in your metadata.
#| standalone: true
import shiny
from shiny import *

app = shiny.App()

@app.ui
def ui():
    return shiny.page_fluid(
        shiny.h2("Quiz App"),
        shiny.ui_select_input("question", "Select a question:", 
                              choices=[q['question'] for q in questions]),
        shiny.ui_radio_buttons("answer", "Choose an answer:", choices=[]),
        shiny.ui_button("submit", "Submit Answer"),
        shiny.ui_output_text_verbatim("feedback")
    )

@app.server
def server(input: Inputs, output: Outputs, session: Session):
    
    @shiny.reactive.Effect
    def update_choices():
        selected_question = input.question()
        if selected_question:
            for q in questions:
                if q["question"] == selected_question:
                    session.update_radio_buttons("answer", choices=q["choices"])
                    break
    
    @output
    @shiny.render.text
    def feedback():
        if input.answer() and input.submit():
            selected_question = input.question()
            selected_answer = input.answer()
            correct_answer = next(q["answer"] for q in questions if q["question"] == selected_question)
            if selected_answer == correct_answer:
                return "Correct!"
            else:
                return f"Incorrect! The correct answer was: {correct_answer}"

if __name__ == "__main__":
    app.run()