app.py

import gradio as gr
import os
from openai import OpenAI

# load API key
api_key = os.getenv("OPENAI_API_KEY")
client = OpenAI(api_key=api_key)

# initial game scenario
initial_scenario = "You wake up in a strange forest. Paths lead in all directions."
default_choices = [
    "Walk north into the dense forest.",
    "Go south back towards a distant town.",
    "Explore east towards the sound of water.",
    "Move west where the land rises."
]

# template prompt
system_prompt = {
    "role": "system",
    "content": (
        "You are a text-based RPG engine. Continue the story based on the player's input. "
        "Include vivid descriptions and always end your response with a few suggested choices. "
        "Format them as a numbered list (1., 2., etc). Do not break character or give explanations."
    )
}

history = [system_prompt, {"role": "user", "content": initial_scenario}]
story_log = initial_scenario


def parse_choices_from_response(text):
    """Extract numbered options from the assistant's response"""
    lines = text.strip().split("\n")
    options = [line.strip() for line in lines if line.strip().startswith(("1.", "2.", "3.", "4."))]
    return options[:4] if options else default_choices


def update_story(player_input):
    """Add user input, get AI response, update story and extract new choices"""
    global story_log

    history.append({"role": "user", "content": f"> {player_input}"})

    response = client.chat.completions.create(
        model="gpt-3.5-turbo",
        messages=history,
        temperature=0.9,
        max_tokens=300
    )

    continuation = response.choices[0].message.content.strip()
    history.append({"role": "assistant", "content": continuation})

    story_log += f"\n\nYou: {player_input}\n{continuation}"
    new_choices = parse_choices_from_response(continuation)

    while len(new_choices) < 4:
        new_choices.append("...")

    return [story_log] + new_choices[:4]


def handle_button(choice_text):
    return update_story(choice_text)


def handle_custom_input(text_input):
    if not text_input.strip():
        return [story_log] + default_choices
    return update_story(text_input.strip())


def restart_game():
    global history, story_log
    history = [system_prompt, {"role": "user", "content": initial_scenario}]
    story_log = initial_scenario
    return [story_log] + default_choices


with gr.Blocks() as app:
    gr.Markdown("## Text-Based RPG Adventure")

    story_display = gr.Textbox(value=initial_scenario, lines=20, interactive=False, label="Your Story")

    with gr.Row():
        btn1 = gr.Button(default_choices[0])
        btn2 = gr.Button(default_choices[1])
        btn3 = gr.Button(default_choices[2])
        btn4 = gr.Button(default_choices[3])

    custom_input = gr.Textbox(lines=1, placeholder="Or type your action here...", label="Your Action")
    restart_btn = gr.Button("🔄 Restart Game")

    # Bind buttons to handlers
    btn1.click(fn=handle_button, inputs=btn1, outputs=[story_display, btn1, btn2, btn3, btn4])
    btn2.click(fn=handle_button, inputs=btn2, outputs=[story_display, btn1, btn2, btn3, btn4])
    btn3.click(fn=handle_button, inputs=btn3, outputs=[story_display, btn1, btn2, btn3, btn4])
    btn4.click(fn=handle_button, inputs=btn4, outputs=[story_display, btn1, btn2, btn3, btn4])

    custom_input.submit(fn=handle_custom_input, inputs=custom_input, outputs=[story_display, btn1, btn2, btn3, btn4])
    restart_btn.click(fn=restart_game, inputs=None, outputs=[story_display, btn1, btn2, btn3, btn4])

app.launch()