#!/opt/cloudlinux/venv/bin/python3 -bb
# -*- coding: utf-8 -*-

# Copyright © Cloud Linux GmbH & Cloud Linux Software, Inc 2010-2019 All Rights Reserved
#
# Licensed under CLOUD LINUX LICENSE AGREEMENT
# http://cloudlinux.com/docs/LICENSE.TXT
from __future__ import print_function
from __future__ import division
from __future__ import absolute_import
import os
import sys
import re
import getopt
import pwd
import logging
import logging.handlers
from cldetectlib import get_boolean_param, CL_CONFIG_FILE

from clquota import (
    QuotaWrapper,
    NoSuchPackageException,
    NoSuchUserException,
    IncorrectLimitFormatException,
    InsufficientPrivilegesException,
    GeneralException,
    QuotaDisabledException
)
from clquota.utils import (
    print_text,
    print_csv,
    print_json,
    print_text_error,
    print_csv_error,
    print_json_error
)


import logging
logger_d = logging.getLogger(__name__)
logger_d.setLevel(logging.DEBUG)
# fh = logging.FileHandler('/root/cl_quota.log')
# fh.setLevel(logging.DEBUG)
# fh.setFormatter(logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s'))
# logger_d.addHandler(fh)


def check_username_and_convert_to_uid(username=None):
    '''
    Checks if username is valid one and returns UID as string
    '''
    if username.lower() == 'default':
        return '0'
    try:
        uid = pwd.getpwnam(username).pw_uid
        return str(uid)
    except KeyError:
        raise NoSuchUserException(username)


def check_uid(uid=None):
    '''
    Checks if UID is valid one and retuns it as string
    '''
    p = re.compile(r'(\d+)')
    pm = p.search(uid)
    if not pm:
        raise NoSuchUserException(uid)
    uid = pm.group(1)
    if uid == '0':  # this is default. No need to check further
        return uid
    try:
        pwd.getpwuid(int(uid))
    except KeyError:
        raise NoSuchUserException(uid)
    return uid


def setup_system_log():
    """
    Sets syslog logger and returns its handler
    """
    logger = logging.getLogger('clquota')
    logger.setLevel(logging.INFO)
    syslogger = logging.handlers.SysLogHandler(address='/dev/log')
    formatter = logging.Formatter(fmt='%(name)s:%(levelname)s %(message)s')
    syslogger.setFormatter(formatter)
    logger.addHandler(syslogger)
    return logger


def usage():
    print('')
    print('Usage: ' + sys.argv[0] + ' [OPTIONS]')
    print('If no options given prints quota statistics for all users')
    print('Options:')
    print('')
    print(' -u | --user               : specifies the user')
    print(' -U | --user-id            : specifies the user ID')
    print(' -S | --soft-limit         : sets the soft limit for a user. '
          'Pass 0 or \'default\' to set package default limit. Pass -1 or \'unlimited\' to cancel limit')
    print(' -H | --hard-limit         : sets the hard limit for a user. '
          'Pass 0 or \'default\' to set package default limit. Pass -1 or \'unlimited\' to cancel limit')
    print(' -V | --csv                : returns data as comma separated values')
    print(' -J | --json               : returns data as json')
    print(' -p | --package            : specifies a package to set or get limits')
    print(' -P | --package-limits     : prints package limits')
    print(' -a | --all-package-limits : prints all package limits (including packages without limits)')
    print(' -Y | --sync               : synchronizes packages and users limits with the database')
    print(' -C | --cache-content      : cache quota data to a file the database')
    print(' -F | --force              : save user quotas even when they are equal to defaults')
    print('      --check              : Deprecated. Check if quotas is enabled/activated/suported; '
          'if disabled show diagnostic information; using with --user or --user-id options')


def quota_sync():
    """
    Quota synchronization
    :return:
    """
    q = QuotaWrapper()
    q.synchronize()
    q.save_user_cache()


def check_autosync_disabled():
    """
    Check autosynchronization parameter in config file and exit if it`s disabled
    :return:
    """
    if not get_boolean_param(CL_CONFIG_FILE, 'cl_quota_limits_autosync', default_val=True):
        print("cl-quota limits autosynchronization is disabled in config " + CL_CONFIG_FILE)
        sys.exit(0)


def parse_args(argv_):
    try:
        opts, args = getopt.getopt(argv_,
                                   'PaVJYCp:u:U:S:H:F',
                                   ['package-limits', 'all-package-limits', 'csv', 'json', 'package=',
                                    'user-id=', 'user=',
                                    'soft-limit=', 'hard-limit=', 'sync', 'cache', 'check',
                                    'profiling', 'force'])
    except getopt.GetoptError:
        usage()
        sys.exit(1)

    config = {}
    config['soft'] = None
    config['hard'] = None
    config['user'] = None
    config['user-id'] = None
    config['format'] = 'text'
    config['check'] = False
    config['profiling'] = False
    config['force_save'] = False

    for o, a in opts:
        if o in ['-P', '--package-limits']:
            config['package'] = None
        elif o in ['-a', '--all-package-limits']:
            config['all-package'] = None
        elif o in ['-p', '--package']:
            config['package'] = a
        elif o in ['-u', '--user']:
            config['user'] = a
        elif o in ['-U', '--user-id']:
            config['user-id'] = a
        elif o in ['-S', '--soft-limit']:
            config['soft'] = a
        elif o in ['-H', '--hard-limit']:
            config['hard'] = a
        elif o in ['-Y', '--sync']:
            config['sync'] = True
        elif o in ['-C', '--cache']:
            config['cache'] = True
        elif o == '--check':
            config['check'] = True
        elif o in ['-V', '--csv']:
            config['format'] = 'csv'
        elif o in ['-J', '--json']:
            config['format'] = 'json'
        elif o in ['--profiling']:
            config['profiling'] = True
        elif o in ['-F', '--force']:
            config['force_save'] = True
    return config


def main(*argv_):
    output_dispatcher = {
        'text': print_text,
        'csv': print_csv,
        'json': print_json,
        'err_text': print_text_error,
        'err_csv': print_csv_error,
        'err_json': print_json_error
    }

    config = parse_args(argv_)

    try:
        if 'sync' in config and 'cache' in config:
            # exit in case synchronization is disabled in config file
            check_autosync_disabled()
            # We don't want to do anything if no saved data
            if not os.path.exists(QuotaWrapper.DATAFILE):
                return
            if config['profiling']:
                # profiler mode
                profiler_log = 'quota-profiling.log'
                print("Profiling end; result saved to " + profiler_log)
                import profile
                profile.run('quota_sync()', profiler_log)
                # Profiler result decode
                import pstats
                p = pstats.Stats(profiler_log)
                print('--------------------------------------')
                print()
                print('Cumulative time:')
                # p.sort_stats('cumulative').print_stats(20)
                p.sort_stats('calls').print_stats(20)
                print('--------------------------------------')
                print()
                print('Total time:')
                # p.sort_stats('time').print_stats(20)
                p.sort_stats('calls').print_stats(20)
            else:
                # work without profiler
                quota_sync()
            return

        q = QuotaWrapper()
        if 'package' in config and not (config['soft'] or config['hard']):
            if config['package'] is None:
                # Show limits for all used packages
                output_dispatcher[config['format']](q.get_package_limits(None), title='package')
            else:
                # Show limits only for given package
                output_dispatcher[config['format']](q.get_all_packages_limits(config['package']), title='package')
            return

        if 'all-package' in config:
            # Show all packages
            output_dispatcher[config['format']](q.get_all_packages_limits(), title='package')
            return

        uid = None
        if config['user']:
            uid = check_username_and_convert_to_uid(config['user'])
        elif config['user-id']:
            uid = check_uid(config['user-id'])

        if config['check'] and uid is not None and int(uid) != 0:
            q._check_if_quota_enabled(uid)

        if config['soft'] or config['hard']:
            if 'package' in config and config['package'] is not None:
                # Set package limits
                q.set_package_limit(
                    package=config['package'],
                    soft=config['soft'],
                    hard=config['hard'])
                return
            # Set user's limits
            q.set_user_limit(uid=uid, soft=config['soft'], hard=config['hard'], force_save=config['force_save'])
            return
        if 'sync' in config:
            q.synchronize()
            return
        if 'cache' in config:
            q.save_user_cache()
            return
        if uid:
            if not config['check']:
                output_dispatcher[config['format']](q.get_user_limits(uid),
                                                    title='id', sort_key=int)
        else:
            output_dispatcher[config['format']](q.get_all_users_limits(),
                                                title='id', sort_key=int)
    except QuotaDisabledException as e:
        if config['check']:
            print(str(e))
    except (NoSuchPackageException, NoSuchUserException,
            InsufficientPrivilegesException, IncorrectLimitFormatException,
            GeneralException) as e:
        output_dispatcher['err_' + config['format']](e)
        setup_system_log().info(e)
    except Exception as e:
        output_dispatcher['err_' + config['format']](e)
        setup_system_log().error(e)


if __name__ == '__main__':
    main(*sys.argv[1:])