import os
import tempfile
import uuid

from fastapi import FastAPI, UploadFile, File, HTTPException
from fastapi.staticfiles import StaticFiles
from fastapi.middleware.cors import CORSMiddleware

from pathlib import Path


app = FastAPI()
app.mount("/static", StaticFiles(directory="static"), name="static")

# Für lokales Testen mit separatem Frontend (z.B. file:// oder anderer Port)
app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],   # in Produktion einschränken!
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)

UPLOAD_DIR = Path("uploads")
UPLOAD_DIR.mkdir(exist_ok=True)


@app.get("/")
def read_root():
    return {"Hello": "World"}

@app.get("/health")
def health():
    return {"status": "ok"}

@app.post("/upload")
async def upload_file(file: UploadFile = File(...)):
    filename = (file.filename or "").lower()
    safe_name = ""
    if not (filename.endswith(".step") or filename.endswith(".stp")):
        raise HTTPException(status_code=400, detail="Upload a .step or .stp file")

     # eindeutiger Dateiname, um Kollisionen zu vermeiden
    suffix = Path(file.filename).suffix
    safe_name = f"{uuid.uuid4().hex}{suffix}"
    target = UPLOAD_DIR / safe_name

    # Datei speichern (streaming)
    with target.open("wb") as f:
        while chunk := await file.read(1024 * 1024):
            f.write(chunk)

    return {
        "original_filename": file.filename,
        "stored_as": safe_name,
        "content_type": file.content_type,
        "size_bytes": target.stat().st_size,
    }