from fastapi import FastAPI
from fastapi.responses import HTMLResponse
from fastapi.middleware.cors import CORSMiddleware
import uvicorn

from backend_api import create_api_app
from chat_ui import create_chat_interface

try:
    from fastapi_gradio import mount_gradio_app
except ImportError:
    # fallback if helper lib not installed
    from gradio.routes import mount_gradio_app

app = create_api_app()

# Allow frontend apps to talk to backend
app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)

# Mount Gradio Chat UI at /chat
gradio_chat_app = create_chat_interface()
mount_gradio_app(app, gradio_chat_app, path="/chat")


@app.get("/")
def root():
    return HTMLResponse("""
    <h2>Omniscient Framework API</h2>
    <p>Available endpoints:</p>
    <ul>
      <li><a href="/docs">API Documentation (Swagger)</a></li>
      <li><a href="/chat">Chatbot UI (Gradio)</a></li>
    </ul>
    """)


if __name__ == "__main__":
    uvicorn.run(app, host="0.0.0.0", port=7860)