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import os
import gradio as gr
import requests

# Retrieve the API key from the environment variable
api_key = os.getenv("CODEPAL_API_KEY")
if not api_key:
    raise ValueError("API key not found. Please set the CODEPAL_API_KEY environment variable.")

# Function to call CodePal's Code Reviewer API
def review_code(code):
    api_url = "https://api.codepal.ai/v1/code-reviewer/query"
    headers = {"Authorization": f"Bearer {api_key}"}
    data = {"code": code}
    response = requests.post(api_url, headers=headers, data=data)
    if response.status_code == 201:
        return response.json().get("result", "No review available.")
    elif response.status_code == 401:
        return "Unauthorized: Invalid or missing API key."
    else:
        return f"Error {response.status_code}: {response.text}"

# Build the Gradio interface using Blocks for better layout control
with gr.Blocks() as demo:
    gr.Markdown("# Code Reviewer Interface\nGet a professional code review for any piece of code.")

    # Hugging Face Login Button (requires `hf_oauth: true` in your README metadata)
    login_button = gr.LoginButton()
    
    with gr.Row():
        with gr.Column():
            code_input = gr.Textbox(
                label="Code to Review", 
                placeholder="Paste your code here...", 
                lines=15
            )
            review_button = gr.Button("Review Code")
            clear_button = gr.Button("Clear")
        with gr.Column():
            review_output = gr.Code(label="Code Review", language="markdown")
    
    # Examples to guide users
    gr.Examples(
        examples=[
            ["def factorial(n):\n    if n == 0:\n        return 1\n    else:\n        return n * factorial(n-1)\n\nprint(factorial(5))"]
        ],
        inputs=code_input
    )
    
    # Define the actions for the buttons
    review_button.click(review_code, inputs=code_input, outputs=review_output)
    clear_button.click(lambda: ("", ""), outputs=[code_input, review_output])

# Launch the interface
demo.launch()