from fastapi import FastAPI, Header, HTTPException
from fastapi.middleware.cors import CORSMiddleware
import json, os

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

DATA_FILE = "/data/billdata.json"
API_KEY = os.environ.get("API_KEY", "changeme")

os.makedirs("/data", exist_ok=True)

def auth(key):
    if key != API_KEY:
        raise HTTPException(401, "bad key")

@app.get("/data")
def getData(x_api_key: str = Header()):
    auth(x_api_key)
    if not os.path.exists(DATA_FILE):
        return {"providers": [], "receivers": [], "settings": {}}
    return json.loads(open(DATA_FILE).read())

@app.post("/data")
def saveData(body: dict, x_api_key: str = Header()):
    auth(x_api_key)
    with open(DATA_FILE, "w") as f:
        json.dump(body, f)
    return {"status": "ok"}