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# Copyright © Cloud Linux GmbH & Cloud Linux Software, Inc 2010-2026 All Rights Reserved
#
# Licensed under CLOUD LINUX LICENSE AGREEMENT
# http://cloudlinux.com/docs/LICENSE.TXT

"""Kernel-side LVP/LVE operations via pylve bindings."""

from lve_utils.pylve_wrapper import PyLve

from .exceptions import LvdError

try:
    import pylve
except ImportError:
    pylve = None


def get_pylve():
    """Initialize and return a PyLve instance."""
    if pylve is None:
        raise LvdError("pylve module not available")
    py = PyLve(pylve)
    py.initialize()
    if not py.domains_supported():
        raise LvdError("kernel does not support per-domain limits "
                       "(requires lve_lvp_create2)")
    return py


def settings_from_limits(py, limits):
    """Create liblve_settings from a limits dict."""
    settings = py.liblve_settings()
    if 'cpu' in limits:
        settings.ls_cpu = int(limits['cpu'])
    if 'pmem' in limits:
        settings.ls_memory_phy = int(limits['pmem'])
    if 'io' in limits:
        settings.ls_io = int(limits['io'])
    if 'nproc' in limits:
        settings.ls_nproc = int(limits['nproc'])
    if 'iops' in limits:
        settings.ls_iops = int(limits['iops'])
    return settings


def settings_to_dict(settings):
    """Convert liblve_settings to a dict of limit fields."""
    return {
        'cpu': settings.ls_cpu,
        'pmem': settings.ls_memory_phy,
        'io': settings.ls_io,
        'nproc': settings.ls_nproc,
        'iops': settings.ls_iops,
    }


def lvp_setup_direct(domain_id, settings):
    """Call pylve.lve_lvp_setup directly, bypassing the lveapi wrapper.
    The lveapi wrapper iterates /proc/lve/resellers/ which doesn't exist
    for nested domain LVPs (they are leaf containers)."""
    rc = pylve.lve_lvp_setup(domain_id, settings)
    return rc
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