# services/state.py
from pathlib import Path
import json

STATE_FILE = Path("system_info.json")

def load_state():
    if STATE_FILE.exists():
        return json.loads(STATE_FILE.read_text() or "{}")
    return {}

def save_state(d: dict):
    STATE_FILE.write_text(json.dumps(d, indent=2))

def set_target_ip(ip: str):
    st = load_state()
    st["target_host_ip"] = ip
    save_state(st)

def get_target_ip() -> str | None:
    return load_state().get("target_host_ip")

def set_mgmt_info(cidr: str, gw: str):
    """Persist the current DHCP values we discovered for eth0 so we can render static OAM later."""
    st = load_state()
    st["mgmt"] = {"cidr": cidr, "gw": gw}
    save_state(st)

def get_mgmt_info() -> dict:
    """Return {'cidr': 'x.x.x.x/yy', 'gw': 'x.x.x.x'} if previously captured, else {}."""
    return load_state().get("mgmt") or {}