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#!/opt/cloudlinux/venv/bin/python3 -bb
# coding=utf-8
#
# 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
#
# isolatectl — unified end-user utility for per-domain resource limits
# and website isolation management.  JSON-only output.
#
# Subcommand groups:
#   isolatectl limits {list,set,apply}         — per-domain (LVD) resource limits
#   isolatectl site-isolation {enable,disable,list} — website isolation (CageFS)

import argparse
import json
import logging
import os
import subprocess
import sys

from clcommon.clpwd import ClPwd

from websiteisolation.commands import cmd_apply, cmd_list, cmd_set
from websiteisolation.exceptions import LvdError


VERSION = '1.0.0'

CAGEFSCTL_USER_BIN = '/usr/sbin/cagefsctl-user'


def _setup_logging():
    log_dir = os.path.join(ClPwd(min_uid=0).get_pw_by_uid(os.getuid())[0].pw_dir, '.lve')
    log_path = os.path.join(log_dir, 'isolatectl.log')
    logger = logging.getLogger('websiteisolation')
    logger.setLevel(logging.DEBUG)
    logger.propagate = False

    fmt = logging.Formatter('[%(levelname)s | %(asctime)s]: %(message)s')

    os.makedirs(log_dir, mode=0o700, exist_ok=True)
    fh = logging.FileHandler(log_path)
    fh.setLevel(logging.DEBUG)
    fh.setFormatter(fmt)
    logger.addHandler(fh)


def _output(data):
    """Print JSON response to stdout."""
    print(json.dumps(data, indent=2))


def _error(message, exit_code=1):
    """Print JSON error to stdout and exit."""
    _output({'result': 'error', 'message': str(message)})
    sys.exit(exit_code)


# ── limits helpers ────────────────────────────────────────────────

def _add_domain_arg(parser, required=True):
    parser.add_argument('--domain', required=required, metavar='NAME',
                        help='domain name')


def _add_limit_args(parser):
    parser.add_argument('--cpu', type=int, metavar='VAL',
                        help='CPU limit (hundredths of percent, 2500 = 25%%)')
    parser.add_argument('--pmem', type=int, metavar='VAL',
                        help='physical memory limit (bytes)')
    parser.add_argument('--io', type=int, metavar='VAL',
                        help='I/O limit (KB/s)')
    parser.add_argument('--nproc', type=int, metavar='VAL',
                        help='max processes')
    parser.add_argument('--iops', type=int, metavar='VAL',
                        help='I/O operations per second')
    parser.add_argument('--ep', type=int, metavar='VAL',
                        help='max entry processes (concurrent connections)')
    parser.add_argument('--vmem', type=int, metavar='VAL',
                        help='virtual memory limit (bytes)')


def _collect_limits(args):
    limits = {}
    for field in ('cpu', 'pmem', 'io', 'nproc', 'iops', 'ep', 'vmem'):
        val = getattr(args, field, None)
        if val is not None:
            limits[field] = val
    return limits


def handle_limits_list(args):
    return cmd_list(lve_id=os.geteuid(), domain=args.domain)


def handle_limits_set(args):
    limits = _collect_limits(args)
    if not limits:
        _error("at least one limit (--cpu, --pmem, --io, --nproc, --iops, --ep, --vmem) required")
    return cmd_set(os.geteuid(), args.domain, limits)


def handle_limits_apply(args):
    return cmd_apply(os.geteuid(), args.domain)


# ── site-isolation helpers ────────────────────────────────────────

def _run_cagefsctl_user(subcmd, extra_args=None):
    """Delegate to cagefsctl-user and pass through its JSON output."""
    argv = [CAGEFSCTL_USER_BIN, 'site-isolation-' + subcmd]
    if extra_args:
        argv.extend(extra_args)

    try:
        proc = subprocess.run(
            argv, capture_output=True, text=True, check=False,
        )
    except OSError as e:
        _error(f"failed to run {CAGEFSCTL_USER_BIN}: {e}")

    parsed = None
    if proc.stdout.strip():
        try:
            parsed = json.loads(proc.stdout)
        except (json.JSONDecodeError, ValueError):
            pass

    if proc.returncode != 0:
        if parsed is not None:
            _output(parsed)
            sys.exit(proc.returncode)
        stderr = proc.stderr.strip()
        _error(f"cagefsctl-user site-isolation-{subcmd} failed "
               f"(exit {proc.returncode}): {stderr}")

    if parsed is not None:
        return parsed

    _error('no output from cagefsctl-user')


def handle_site_isolation_enable(args):
    return _run_cagefsctl_user('enable', ['--domain', args.domain])


def handle_site_isolation_disable(args):
    return _run_cagefsctl_user('disable', ['--domain', args.domain])


def handle_site_isolation_list(args):
    return _run_cagefsctl_user('list')


# ── parser ────────────────────────────────────────────────────────

def build_parser():
    parser = argparse.ArgumentParser(
        prog='isolatectl',
        description='Unified utility for per-domain resource limits and '
                    'website isolation management. JSON-only output.\n\n'
                    'Note: domain limits require site isolation to be '
                    'enabled first (isolatectl site-isolation enable).',
        formatter_class=argparse.RawDescriptionHelpFormatter)
    parser.add_argument('--version', action='version',
                        version=json.dumps({'version': VERSION}))

    groups = parser.add_subparsers(dest='group', metavar='command')

    # ── limits ────────────────────────────────────────────────────
    limits_parser = groups.add_parser(
        'limits',
        help='manage per-domain (LVD) resource limits')
    limits_sub = limits_parser.add_subparsers(dest='subcommand', metavar='subcommand')

    p = limits_sub.add_parser('list', help='show limits for all domains or a specific domain')
    _add_domain_arg(p, required=False)
    p.set_defaults(func=handle_limits_list)

    p = limits_sub.add_parser(
        'set', help='store per-domain limits and apply them to kernel',
        epilog='Example:\n'
               '  isolatectl limits set --domain example.com --cpu 5000 --pmem 268435456 --io 2048 --nproc 30 --iops 500 --ep 20 --vmem 536870912\n'
               '\n'
               'This sets: CPU 50%%, 256 MB PMEM, 2048 KB/s IO, 30 procs, 500 IOPS, 20 entry procs, 512 MB VMEM.\n'
               'Use PYLVE_DEBUG=1 for verbose helper output.',
        formatter_class=argparse.RawDescriptionHelpFormatter)
    _add_domain_arg(p)
    _add_limit_args(p)
    p.set_defaults(func=handle_limits_set)

    p = limits_sub.add_parser('apply', help="push one domain's limits from config to kernel")
    _add_domain_arg(p)
    p.set_defaults(func=handle_limits_apply)

    # ── site-isolation ────────────────────────────────────────────
    si_parser = groups.add_parser(
        'site-isolation',
        help='manage website isolation (CageFS)')
    si_sub = si_parser.add_subparsers(dest='subcommand', metavar='subcommand')

    p = si_sub.add_parser('enable', help='enable site isolation for domain(s)')
    p.add_argument('--domain', required=True,
                   help='domain name(s) to enable site isolation for (comma-separated)')
    p.set_defaults(func=handle_site_isolation_enable)

    p = si_sub.add_parser('disable', help='disable site isolation for domain(s)')
    p.add_argument('--domain', required=True,
                   help='domain name(s) to disable site isolation for (comma-separated)')
    p.set_defaults(func=handle_site_isolation_disable)

    p = si_sub.add_parser('list', help='list domains with site isolation enabled')
    p.set_defaults(func=handle_site_isolation_list)

    return parser


def main():
    if os.getuid() == 0:
        _error("isolatectl must not be run as root; run as a regular user")

    _setup_logging()
    log = logging.getLogger(__name__)
    log.debug('Executing "%s"', ' '.join(sys.argv))

    is_debug = int(os.environ.get('PYLVE_DEBUG', 0))
    if is_debug:
        print(f"DEBUG [isolatectl]: uid={os.getuid()} argv={sys.argv}",
              file=sys.stderr)

    parser = build_parser()
    args = parser.parse_args()

    if not args.group:
        parser.print_help()
        sys.exit(1)

    if not hasattr(args, 'func'):
        # Group given but no subcommand
        if args.group == 'limits':
            parser.parse_args(['limits', '--help'])
        elif args.group == 'site-isolation':
            parser.parse_args(['site-isolation', '--help'])
        sys.exit(1)

    try:
        result = args.func(args)
        _output(result)
    except LvdError as e:
        log.error('%s', e)
        _error(str(e))
    except Exception as e:
        log.exception('unexpected error')
        _error(f"unexpected error: {e}")


if __name__ == '__main__':
    main()