# -*- coding: utf-8 -*-

# lvectl.py - module for interfacing with lvectl utility for get/set LVE limits
#
# 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

import copy
import json

import lvectllib
from clcommon import cpapi
from clcommon.clexception import FormattedException
from cllimits.lib import exec_utility
from cllimits.lib.utils import _convert_memory_value_to_adaptive_format


class LvectlException(FormattedException):
    pass


class LveCtl:
    """
    Library for work with LVE limits
    """
    MEGAHERZ = 1000000
    GIGAHERZ = 1000000000
    lve_version = None
    _UTILITY_PATH = "/usr/sbin/lvectl"
    _packages_limits = None  # Panel packages limits
    _package_data = None  # Panel LVE limits
    _resellers_data = None  # Panel LVP limits

    def __init__(self):
        """
        Object constructor. Get LVE version
        """
        _, s_lve_version = exec_utility(self._UTILITY_PATH, ["lve-version"])
        self.lve_version = int(s_lve_version)
        self._package_data = None  # type: dict
        self._resellers_data = None  # type: dict

    @staticmethod
    def get_panel_users_uid_list():
        """
        Get panel users uid list
        :return: List of uids
        """
        user_packages = cpapi.list_users()
        uid_list = list(user_packages.keys())
        uid_list.append(0)
        return uid_list

    def get_limits_by_user_id(self, user_id, human_readable_numbers=False):
        """
        Reads limits by user id
        :param user_id: user/lve id
        :param human_readable_numbers: if True PMEM and VMEM limits in KBytes, MBytes or GBytes
            False - in bytes
        :return: dictionary
        """
        # Load LVE limits data if need
        self._load_info(human_readable_numbers, userid=user_id)
        if user_id in self._package_data:
            user_limits = copy.deepcopy(self._package_data[user_id])
            del user_limits["PACKAGE"]
            return user_limits

        # No limits, use default
        # user_limits = self._package_data[0]
        user_limits = copy.deepcopy(self._package_data[0])
        del user_limits["PACKAGE"]
        return user_limits

    def get_limits_by_reseller_name(self, reseller_name, human_readable_numbers=False):
        """
        Reads limits by reseller name
        :param reseller_name:
        :param: id - user/lve id
        :param human_readable_numbers: if True PMEM and VMEM limits in KBytes, MBytes or GBytes
            False - in bytes
        :rtype: dict
        """
        # lvectl list-reseller <reseller_name> --json --with-name
        self._load_resellers_info(human_readable_numbers, reseller_name)
        reseller_limits = copy.deepcopy(self._resellers_data.get(reseller_name))
        return reseller_limits

    def get_default_limits_by_reseller_name(self, reseller_name, human_readable_numbers=False):
        """
        Reads limits by reseller name
        :param reseller_name: reseller's name
        :param human_readable_numbers: if True PMEM and VMEM limits in KBytes, MBytes or GBytes
            False - in bytes
        :rtype: dict[str, str | dict]
        """
        if not lvectllib.lve.reseller_limit_supported():
            return

        lvectl_args = ['list-reseller', reseller_name, '--json', '--with-name']
        if not human_readable_numbers:
            lvectl_args.append('--bytes')
        ret_code, std_out = exec_utility(self._UTILITY_PATH, lvectl_args)
        loaded_json = json.loads(std_out)
        if ret_code != 0:
            raise LvectlException(loaded_json['msg'])

        default_info = loaded_json.get('data', [])
        if default_info:
            default_limits = {
                'PACKAGE': 'DEFAULT',
                'cpu': {'all': default_info[0]['SPEED']},
                'ep': default_info[0]['EP'],
                'io': {'all': default_info[0]['IO']},
                'iops': default_info[0]['IOPS'],
                'nproc': default_info[0]['NPROC'],
                'pmem': _convert_memory_value_to_adaptive_format(default_info[0]['PMEM'],
                                                                 human_readable_numbers),
                'vmem': _convert_memory_value_to_adaptive_format(default_info[0]['VMEM'],
                                                                 human_readable_numbers)
            }
            return default_limits

    def get_package_name_by_user_id(self, user_id):
        """
        Get package name by user id.
        None package returns as str(None) for user checker compatibility:
          'not str(None)' is True
        :param: id - user/lve id
        :return: Package name
        """
        if self._package_data is None:
            from clcommon.cpapi import reseller_package_by_uid  # pylint: disable=import-outside-toplevel
            try:
                package_name = str(reseller_package_by_uid(user_id)[1])
            except IndexError:
                # No user with such uid, use empty package name
                package_name = ''
        else:
            if user_id in self._package_data:
                package_name = str(self._package_data[user_id]["PACKAGE"])
            else:
                # default
                package_name = str(self._package_data[0]["PACKAGE"])
        return package_name

    def __set_error(self, param, lve_id, err):
        return {'message': "%(what)s set error for uid=%(uid)s%(error)s",
                'context': {'what': param, 'uid': lve_id,
                            'error': f" [{err}]" if err else ""}}

    def _set_container_limits_by_id(self, command, container_id, limits, reseller_name=None):
        """
        Set limits for given container id
        :param: str command: 'set' | 'set-reseller', based on container type
        :param: int | str container_id: LVE | LVP id for set limits
        :param: dict limits: new LVE limits. Available keys: speed, vmem, pmem, mep, io, nproc, iops
                    and 'save-all-parameters'.
                    All other keys are ignoring. If some parameter absent on current LVE version
                    (for example pmem on LVE4), it will be ignored too.
        :param reseller_name: Reseller name
        """
        lvectl_args = [command, str(container_id)]
        # 1. Check arguments and form lvectl call arguments
        if "mep" in limits or "ep" in limits:
            limits["maxEntryProcs"] = limits.get("mep", limits.get("ep"))
        for k in ("speed", "vmem", "pmem", "maxEntryProcs", "io", "nproc", "iops"):
            v = limits.get(k)
            if v is None:
                continue
            v = str(v).strip()
            if k in ["pmem", "nproc", "iops"] and self.lve_version == 4:
                continue
            if k in ["iops"] and self.lve_version == 6:
                continue
            if k == "speed" and v.isdigit():
                v = f"{v}%"
            lvectl_args.append(f"--{k}={v}")
        if len(lvectl_args) <= 2:
            return 0
        if limits.get("save-all-parameters"):
            lvectl_args.append("--save-all-parameters")
        # Add reseller name if need
        if reseller_name:
            lvectl_args.append(f"--reseller={reseller_name}")
        # 2. call utility to set limits
        ret_code, out, err = exec_utility(self._UTILITY_PATH, lvectl_args, stderr=True)
        if ret_code != 0:
            # Set limits error
            raise LvectlException(self.__set_error('Limits', container_id, err))

    def _set_container_limits_by_id_or_name(self, reseller_id):
        """
        Set limits for given container id
        :param reseller_id: LVP id or reseller's name or '--all'
        :type reseller_id: int | str
        """
        lvectl_args = ['set-reseller', reseller_id]
        ret_code, out, err = exec_utility(self._UTILITY_PATH, lvectl_args, stderr=True)
        if ret_code != 0:
            # Set limits error
            raise LvectlException(self.__set_error('Limits', reseller_id, err))

    def set_lve_limits_by_user_id(self, lve_id, limits, reseller_name=None):
        """
        Wrapper for _set_container_limits_by_id, set limits for lve_id;
        :param int lve_id: user's container id
        :param limits: dict with limits to set
        :param reseller_name: Reseller name
        :return: int
        """
        if bool(lve_id) and not self.get_package_name_by_user_id(lve_id):
            return 1
        self._set_container_limits_by_id('set', lve_id, limits, reseller_name=reseller_name)
        return 0

    def set_lvp_limits_by_reseller_id(self, lvp_id, limits):
        """
        Wrapper for _set_container_limits_by_id, set limits for lvp_id;
        :type lvp_id: int
        :type limits: dict
        :return: int
        """
        self._set_container_limits_by_id('set-reseller', lvp_id, limits)
        return 0

    def set_lvp_defaults_by_reseller_id(self, lvp_id, limits):
        """
        Wrapper for _set_container_limits_by_id, set limits for lvp_id;
        :type lvp_id: int
        :type limits: dict
        :return: int
        """
        self._set_container_limits_by_id('set-reseller-default', lvp_id, limits)
        return 0

    def set_lve_unlimited(self, lve_id, reseller_name=None):
        """
        Set unlimited LVE for lve_id
        :param: lve_id `int`: LVE id
        :param reseller_name: Reseller name
        :return: 0
        """
        args = ["set", str(lve_id), "--unlimited"]
        if reseller_name is not None:
            args.extend(['--reseller', reseller_name])
        ret_code, err = exec_utility(self._UTILITY_PATH, args)
        if ret_code != 0:
            raise LvectlException(self.__set_error('Unlimited', lve_id, err))
        return 0

    def set_lvp_unlimited(self, lvp_id):
        """
        Set unlimited LVP for reseller;
        Accepts name or id;
        :type lvp_id: str | int
        :return: 0
        """
        args = ["set-reseller", str(lvp_id), "--unlimited"]
        ret_code, err = exec_utility(self._UTILITY_PATH, args)
        if ret_code != 0:
            raise LvectlException(self.__set_error('Unlimited', lvp_id, err))
        return 0

    def reset_lve_limits(self, lve_id, limits):
        """
        Reset LVE limits for lve_id. Set default limits for LVE package or
        system default LVE
        :param: lve_id `int: LVE id
        :return: 0
        """
        args = ["set", str(lve_id), f"--default={','.join(limits)}"]
        ret_code, err = exec_utility(self._UTILITY_PATH, args)
        if ret_code != 0:
            raise LvectlException(self.__set_error('Default', lve_id, err))
        return 0

    def reset_reseller_limits(self, reseller_name, limits):
        """
        Reset LVP limits for reseller_name.
        :param: reseller_name str:
        :return: 0
        """
        args = ["set-reseller", str(reseller_name), f"--default={','.join(limits)}"]
        ret_code, err = exec_utility(self._UTILITY_PATH, args)
        if ret_code != 0:
            raise LvectlException(self.__set_error('Default', reseller_name, err))
        return 0

    def apply_all_limits(self):
        """
        Apply all already configured limits
        :return: ret code
        """
        ret_code, err = exec_utility(self._UTILITY_PATH, ["apply", "all"])
        return ret_code

    def disable_reseller_limits(self, reseller_name):
        """
        Disable reseller limits for given name;
        Equivalent to lvectl remove-reseller <str>
        :type reseller_name: str
        :return: 0
        """
        args = ["remove-reseller", str(reseller_name), '--json']
        ret_code, err = exec_utility(self._UTILITY_PATH, args)
        if ret_code != 0:
            raise LvectlException(self.__set_error('Disable reseller limits', reseller_name, err))
        return 0

    def _load_resellers_info(self, human_readable_numbers, reseller_name):
        """
        Load information about resellers;
        :type human_readable_numbers: bool
        :type reseller_name: str | None
        :return:
        """
        self._resellers_data = {}
        if not lvectllib.lve.reseller_limit_supported():
            return

        lvectl_args = ['list-reseller', '--json', '--with-name']
        if not human_readable_numbers:
            lvectl_args.append('--bytes')
        ret_code, std_out = exec_utility(self._UTILITY_PATH, lvectl_args)
        loaded_json = json.loads(std_out)
        if ret_code != 0:
            raise LvectlException(loaded_json['msg'])

        # To edit reseller limits in UI, admin should have ability to see
        # all resellers, even those for which limits have not yet been enabled.
        # So we just init dict with all resellers and frontend will rely
        # on empty "limits" key to determine whether reseller limits has been
        # already set for particular reseller or not.
        for reseller in cpapi.resellers():
            if reseller_name and reseller_name != reseller:
                continue
            self._resellers_data[reseller] = {'name': reseller, 'limits': {}}

        # Refresh settings with utility's data
        for reseller in loaded_json.get('data', []):
            id_, name = reseller['ID'].split(':')
            if reseller_name and reseller_name != name:
                continue
            reseller_info = {
                'id': id_,
                'name': name,
                'limits': {
                    'cpu': {'all': reseller['SPEED']},
                    'ep': reseller['EP'],
                    'io': {'all': reseller['IO']},
                    'iops': reseller['IOPS'],
                    'nproc': reseller['NPROC'],
                    'pmem': _convert_memory_value_to_adaptive_format(reseller['PMEM'],
                                                                     human_readable_numbers),
                }
            }
            self._resellers_data[reseller_info['name']] = reseller_info

    def _load_info(self, human_readable_numbers, userid=None, reseller=None):
        """
        Loads all package info from lvectl
        :param human_readable_numbers: if True PMEM and VMEM limits in KBytes, MBytes or GBytes
            False - in bytes
        :return: None
        """
        if self._resellers_data is None:
            self._load_resellers_info(human_readable_numbers, reseller)

        if self._package_data is not None:
            return

        # Get panel packages data from lvectl utility
        # Create Panel packages data
        self._package_data = {}
        if userid is not None:
            lvectl_args = ['paneluserlimits', str(userid)]
        elif reseller is not None:
            lvectl_args = ['paneluserslimits', str(reseller)]
        else:
            lvectl_args = ['paneluserslimits']
        lvectl_args.append('--json')
        if not human_readable_numbers:
            lvectl_args.append('--bytes')
        ret_code, std_out = exec_utility(self._UTILITY_PATH, lvectl_args)
        loaded_json = json.loads(std_out)
        if ret_code != 0:
            raise LvectlException(loaded_json['msg'])
        json_data = loaded_json['data']
        for pkg_data in json_data:
            pkg_limits = {}
            pkg_name = pkg_data['PACKAGE']
            if pkg_name == 'VE_DEFAULT':
                pkg_name = 'DEFAULT'
            # self._package_data[pkg_data['ID']] = pkg_name
            pkg_limits['PACKAGE'] = pkg_name
            # All LVE
            pkg_limits['cpu'] = {'all': pkg_data['SPEED']}
            pkg_limits['io'] = {'all': pkg_data['IO']}
            pkg_limits['vmem'] = _convert_memory_value_to_adaptive_format(pkg_data['VMEM'],
                                                                          human_readable_numbers)
            pkg_limits['ep'] = pkg_data['EP']
            if self.lve_version >= 6:
                # LVE 6, 8
                pkg_limits['pmem'] = _convert_memory_value_to_adaptive_format(pkg_data['PMEM'],
                                                                              human_readable_numbers)
                pkg_limits['nproc'] = pkg_data['NPROC']
            if self.lve_version >= 8:
                # LVE 8
                pkg_limits['iops'] = pkg_data['IOPS']
            self._package_data[int(pkg_data['ID'])] = pkg_limits

        if reseller is not None:
            reseller_defaults = self.get_default_limits_by_reseller_name(reseller, human_readable_numbers)
            if reseller_defaults:
                self._package_data[0] = reseller_defaults
                return

        if 0 not in self._package_data:
            # Defaults limits not found, set them manually
            pkg_limits = {}
            pkg_limits['PACKAGE'] = 'DEFAULT'
            # All LVE
            pkg_limits['cpu'] = {'all': '0'}
            pkg_limits['io'] = {'all': '0'}
            pkg_limits['vmem'] = '0K'
            pkg_limits['ep'] = '0'
            if self.lve_version >= 6:
                # LVE 6, 8
                pkg_limits['pmem'] = '0K'
                pkg_limits['nproc'] = '0'
            if self.lve_version >= 8:
                # LVE 8
                pkg_limits['iops'] = '0'
            self._package_data[0] = pkg_limits