"""UCI profile snapshots under /mmc/mk8/profiles/<name>/{pineapd,wireless,network}"""
import os, re, time

PROFILES_DIR = '/mmc/mk8/profiles'
CONFIGS = ('pineapd', 'wireless', 'network')
NAME_RE = re.compile(r'^[A-Za-z0-9._-]{1,64}$')


def run_cmd(args, timeout=20, input_data=None):
    """Lazy import avoids a circular import with server.py; tests monkeypatch."""
    from server import device_run
    return device_run(args, timeout=timeout, input_data=input_data)


def _path(name):
    """Resolve a profile name to its directory. HTTP-supplied names are never
    trusted: reject anything but [A-Za-z0-9._-]{1,64} and explicitly refuse
    '.'/'..' so traversal can never escape PROFILES_DIR."""
    if not isinstance(name, str) or not NAME_RE.match(name) \
            or name in ('.', '..'):
        raise ValueError('invalid profile name')
    return os.path.join(PROFILES_DIR, name)


def snapshot(name):
    dest = _path(name)
    try:
        os.makedirs(dest, exist_ok=True)
        wrote = False
        for cfg in CONFIGS:
            rc, out, err = run_cmd(['uci', 'export', cfg])
            if rc != 0 or not (out or '').strip():
                continue
            with open(os.path.join(dest, cfg + '.uci'), 'w') as f:
                f.write(out)
            wrote = True
        return wrote
    except OSError:
        return False


def auto_name(op):
    return 'pre-%s-%d' % (op, int(time.time()))


def list_profiles():
    try:
        out = []
        for d in os.listdir(PROFILES_DIR):
            try:
                if os.path.isdir(_path(d)):
                    out.append(d)
            except ValueError:
                continue
        return sorted(out)
    except OSError:
        return []


def delete(name):
    import shutil
    shutil.rmtree(_path(name), ignore_errors=True)


def restore(name):
    """Restore configs then commit once per config. Caller runs wifi reload
    / service restart as appropriate for the operation."""
    src = _path(name)
    restored = []
    if not os.path.isdir(src):
        return {'ok': False, 'restored': [], 'error': 'profile not found'}
    for cfg in CONFIGS:
        fpath = os.path.join(src, cfg + '.uci')
        if not os.path.isfile(fpath):
            continue
        with open(fpath) as f:
            text = f.read()
        rc, _, err = run_cmd(['uci', 'import', cfg], input_data=text)
        if rc != 0:
            return {'ok': False, 'restored': restored,
                    'error': 'import failed'}
        run_cmd(['uci', 'commit', cfg])
        restored.append(cfg)
    return {'ok': True, 'restored': restored}


LASTKNOWN_GOOD = 'lastknown-good'


def promote_lastknown_good():
    """Replace the lastknown-good profile with the live config."""
    delete(LASTKNOWN_GOOD)
    return snapshot(LASTKNOWN_GOOD)