import hashlib
import os
from datetime import datetime, timezone
from typing import Dict

from .utils import load_json, save_json

DEVICE_STATE_PATH = os.path.join(os.path.dirname(__file__), "..", "..", "infra", "device_state.json")
BOOTSTRAP_PATH = os.path.join(os.path.dirname(__file__), "..", "..", "infra", "bootstrap.json")


def _timestamp() -> str:
    return datetime.now(timezone.utc).strftime("%Y-%m-%dT%H:%M:%SZ")


def _new_hash(device: str, timestamp: str) -> str:
    return hashlib.sha256(f"bootstrap-{device}-{timestamp}".encode()).hexdigest()[:8]


def oob_seed_device(device: str) -> Dict:
    device_state = load_json(DEVICE_STATE_PATH)
    bootstrap_state = load_json(BOOTSTRAP_PATH)

    now = _timestamp()
    cfg_hash = _new_hash(device, now)

    device_state[device] = {
        "role": device_state.get(device, {}).get("role", "unknown"),
        "pod": device_state.get(device, {}).get("pod", "unknown"),
        "status": "healthy",
        "last_config_hash": cfg_hash,
        "last_update": now,
    }
    save_json(DEVICE_STATE_PATH, device_state)

    bootstrap_state[device] = {
        "bootstrapped": True,
        "bootstrap_time": now,
        "method": "oob_seed_device",
        "initial_config_hash": cfg_hash,
    }
    save_json(BOOTSTRAP_PATH, bootstrap_state)

    return {
        "device": device,
        "bootstrapped": True,
        "bootstrap_time": now,
        "method": "oob_seed_device",
        "config_hash": cfg_hash,
        "message": "Device bootstrapped (simulated).",
    }