"""Config management for adacam-api."""
import json
import os
import uuid

CONFIG_PATH = "/data/adacam/config.json"
FIRMWARE_VERSION = "adacam-1.0.0"

_defaults = {
    "device_id": None,
    "adamaps_key": "adamaps-ingest-2026",
    "adamaps_api": "https://api.adamaps.org",
    "ap_interface": "wlp1s0f0",
    "tunnel_host": "",
    "tunnel_user": "",
    "tunnel_port": 2222,
}

_config = None


def load():
    """Load config from disk, creating defaults if needed."""
    global _config
    os.makedirs(os.path.dirname(CONFIG_PATH), exist_ok=True)
    
    if os.path.exists(CONFIG_PATH):
        with open(CONFIG_PATH) as f:
            _config = {**_defaults, **json.load(f)}
    else:
        _config = _defaults.copy()
    
    # Generate device_id on first run
    if not _config.get("device_id"):
        _config["device_id"] = str(uuid.uuid4())
        save()
    
    return _config


def save():
    """Persist config to disk."""
    os.makedirs(os.path.dirname(CONFIG_PATH), exist_ok=True)
    with open(CONFIG_PATH, "w") as f:
        json.dump(_config, f, indent=2)


def get(key, default=None):
    """Get a config value."""
    if _config is None:
        load()
    return _config.get(key, default)