from fastapi import APIRouter, UploadFile, File, HTTPException
from fastapi.responses import JSONResponse
import uuid, shutil, time
from pathlib import Path
from config import UPLOADS_DIR, EPT_DIR, SUPPORTED_FORMATS
from services.converter import run_entwine, ENTWINE_AVAILABLE

router = APIRouter()

@router.post("/upload")
async def upload(file: UploadFile = File(...)):
    suffix = Path(file.filename).suffix.lower()
    if suffix not in SUPPORTED_FORMATS:
        raise HTTPException(400, f"Format non supporté: {suffix}")
    if not ENTWINE_AVAILABLE:
        raise HTTPException(500, "entwine non disponible sur ce serveur")

    pc_id = str(uuid.uuid4())[:8]
    upload_path = UPLOADS_DIR / f"{pc_id}{suffix}"
    out_dir = EPT_DIR / pc_id

    file_size = 0
    with open(upload_path, "wb") as f:
        while chunk := await file.read(1024 * 1024):
            f.write(chunk)
            file_size += len(chunk)

    if file_size == 0:
        upload_path.unlink()
        raise HTTPException(400, "Fichier vide")

    if out_dir.exists():
        shutil.rmtree(out_dir, ignore_errors=True)
    out_dir.mkdir(parents=True, exist_ok=True)

    start = time.time()
    result = run_entwine(upload_path, out_dir)

    return JSONResponse({
        "id": pc_id,
        "filename": file.filename,
        "size_mb": round(file_size / (1024 * 1024), 2),
        "viewer_path": f"/viewer/{pc_id}",
        "embed_path": f"/viewer-embed/{pc_id}",
        "ept_dir": result.get("ept_dir"),
        "conversion_time_seconds": round(time.time() - start, 2),
    })