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import os
import gradio as gr
from openai import OpenAI

client = OpenAI(
    base_url="https://router.huggingface.co/v1",
    api_key=os.environ["HF_TOKEN"],
)

MODEL_ID = "zai-org/GLM-4.7-Flash:novita"

def improve(prompt: str) -> str:
    prompt = prompt.strip()
    if not prompt:
        return "Please enter a prompt."

    try:
        completion = client.chat.completions.create(
            model=MODEL_ID,
            messages=[
                {
                    "role": "system",
                    "content": (
                        "You are a prompt engineer. Rewrite user prompts to be clearer, "
                        "more detailed, and more effective for AI models. Keep the same intent."
                    ),
                },
                {
                    "role": "user",
                    "content": prompt,
                },
            ],
            max_tokens=160,
            temperature=0.5,
        )
        return completion.choices[0].message.content
    except Exception as e:
        return f"Error from model: {e}"

def app():
    return gr.Interface(
        fn=improve,
        inputs=gr.Textbox(lines=3, label="Enter a prompt to improve"),
        outputs=gr.Textbox(label="Improved prompt"),
        title="Chapter 2 – Prompt Improver (HF Router + OpenAI client)",
    )