import json, subprocess, hashlib
from markupsafe import Markup

_APPLY_CMD     = 'sudo python3 ~/router/core.py --apply'
_APPLY_CMD_VPN = 'sudo python3 ~/router/vpn.py --apply'


def apply_msg(cmd=None):
    """Return a Markup flash message for the apply reminder."""
    command = cmd if cmd is not None else _APPLY_CMD
    return Markup(
        f'Configuration updated. To apply changes, run: '
        f'<code><strong>{command}</strong></code>'
    )

CONFIGS_DIR = '/configs'
CORE_FILE   = f'{CONFIGS_DIR}/core.json'


def load_core():
    try:
        with open(CORE_FILE) as f:
            return json.load(f)
    except Exception:
        return {}


def save_core(data):
    with open(CORE_FILE, 'w') as f:
        json.dump(data, f, indent=2)


def core_hash():
    try:
        with open(CORE_FILE, 'rb') as f:
            return hashlib.md5(f.read()).hexdigest()
    except Exception:
        return ''


def verify_core_hash(submitted):
    if not submitted:
        return True
    return submitted == core_hash()


def run_apply():
    try:
        subprocess.run(
            ['python3', f'{CONFIGS_DIR}/core.py', '--apply'],
            capture_output=True, timeout=30
        )
    except Exception:
        pass


def run_apply_vpn():
    try:
        subprocess.run(
            ['python3', f'{CONFIGS_DIR}/vpn.py', '--apply'],
            capture_output=True, timeout=30
        )
    except Exception:
        pass


def run_update_blocklists():
    try:
        subprocess.run(
            ['python3', f'{CONFIGS_DIR}/core.py', '--update-blocklists'],
            capture_output=True, timeout=120
        )
    except Exception:
        pass