import os
import threading
from fastapi import FastAPI, Request
from fastapi.responses import FileResponse, JSONResponse, PlainTextResponse
from fastapi.middleware.cors import CORSMiddleware
from fastapi.staticfiles import StaticFiles
import uvicorn

app = FastAPI()
app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"], allow_methods=["*"], allow_headers=["*"]
)

# In-memory, process-lifetime only
_CONFIG = {}
_LOCK = threading.Lock()

# Serve static frontend
app.mount("/static", StaticFiles(directory="static"), name="static")

@app.get("/", response_class=FileResponse)
def root():
    return FileResponse("static/index.html")

@app.get("/api/ping", response_class=PlainTextResponse)
def ping():
    return "pong"

@app.get("/api/config")
def get_config():
    with _LOCK:
        return JSONResponse(_CONFIG or {"background": None, "items": []})

@app.post("/api/config")
async def set_config(req: Request):
    data = await req.json()
    # Basic shape guard
    if not isinstance(data, dict):
        return JSONResponse({"error": "Invalid payload"}, status_code=400)
    with _LOCK:
        # store exactly what client sent (ephemeral)
        _CONFIG.clear()
        _CONFIG.update(data)
    return JSONResponse({"ok": True})

if __name__ == "__main__":
    port = int(os.environ.get("PORT", "7860"))
    uvicorn.run("app:app", host="0.0.0.0", port=port, reload=False)