"""
Runtime config — loaded from env, mutable via API.

The UI config panel is just a visual editor for these same values.
"""

from __future__ import annotations

import os

_config = {
    "device": os.environ.get("DEVICE", "auto"),
    "yolo_model": os.environ.get("YOLO_MODEL", "yolov8n.pt"),
    "yolo_confidence": float(os.environ.get("YOLO_CONFIDENCE", "0.3")),
    "vram_budget_mb": int(os.environ.get("VRAM_BUDGET_MB", "10240")),
    "strategy": os.environ.get("STRATEGY", "sequential"),
    "ocr_languages": os.environ.get("OCR_LANGUAGES", "en").split(","),
    "ocr_min_confidence": float(os.environ.get("OCR_MIN_CONFIDENCE", "0.5")),
}


def get_config() -> dict:
    return _config


def update_config(changes: dict) -> dict:
    _config.update(changes)
    return _config


def get_device() -> str:
    device = _config["device"]
    if device != "auto":
        return device
    try:
        import torch
        return "cuda" if torch.cuda.is_available() else "cpu"
    except ImportError:
        return "cpu"