from django.shortcuts import render
from plogical.processUtilities import ProcessUtilities
import threading as multi
from plogical.acl import ACLManager
from plogical.mailUtilities import mailUtilities
import plogical.CyberCPLogFileWriter as logging
from serverStatus.serverStatusUtil import ServerStatusUtil
import os, stat


class ContainerManager(multi.Thread):
    defaultConf = """group {groupName}{
        cpu {
                cpu.cfs_quota_us = {cfs_quota_us};
                cpu.cfs_period_us = {cfs_period_us};
        }
        memory {
                memory.limit_in_bytes = {memory}m;
        }
        blkio {
                blkio.throttle.read_bps_device = "{major}:{minor}         {io}";
                blkio.throttle.write_bps_device = "{major}:{minor}         {io}";
                blkio.throttle.read_iops_device = "{major}:{minor}         {iops}";
                blkio.throttle.write_iops_device = "{major}:{minor}         {iops}";
        }
        net_cls
             {
               net_cls.classid = 0x10{net_cls};
        }
}"""

    def __init__(self, request=None, templateName=None, function=None, data=None):
        multi.Thread.__init__(self)
        self.request = request
        self.templateName = templateName
        self.function = function
        self.data = data

    def run(self):
        try:
            if self.function == 'submitContainerInstall':
                self.submitContainerInstall()
            elif self.function == 'addTrafficController':
                self.addTrafficController()
            elif self.function == 'removeLimits':
                self.removeLimits()
        except BaseException, msg:
            logging.CyberCPLogFileWriter.writeToFile(str(msg) + ' [ContainerManager.run]')

    @staticmethod
    def fetchHexValue(count):
        hexValue = format(count, '02x')

        if len(hexValue) == 1:
            return '000' + hexValue
        elif len(hexValue) == 2:
            return '00' + hexValue
        elif len(hexValue) == 3:
            return '0' + hexValue
        elif len(hexValue) == 3:
            return hexValue

    @staticmethod
    def prepConf(groupName, cfs_quota_us, cfs_period_us, memory, io, iops, net_cls):
        try:
            dev = os.stat('/')[stat.ST_DEV]
            major = str(os.major(dev))
            minor = str(0)
            finalIO = str(int(io) * 1024 * 1024)

            ioConf = ContainerManager.defaultConf.replace('{groupName}', groupName)
            ioConf = ioConf.replace('{cfs_quota_us}', cfs_quota_us)
            ioConf = ioConf.replace('{cfs_period_us}', cfs_period_us)
            ioConf = ioConf.replace('{memory}', memory)
            ioConf = ioConf.replace('{major}', major)
            ioConf = ioConf.replace('{minor}', minor)
            ioConf = ioConf.replace('{io}', finalIO)
            ioConf = ioConf.replace('{iops}', str(iops))
            ioConf = ioConf.replace('{net_cls}', str(net_cls))

            return ioConf
        except BaseException, msg:
            logging.CyberCPLogFileWriter.writeToFile(str(msg))
            return 0

    def renderC(self):

        userID = self.request.session['userID']
        currentACL = ACLManager.loadedACL(userID)

        if currentACL['admin'] == 1:
            pass
        else:
            return ACLManager.loadError()

        data = {}
        data['OLS'] = 0
        data['notInstalled'] = 0

        if ProcessUtilities.decideServer() == ProcessUtilities.OLS:
            data['OLS'] = 1
            data['notInstalled'] = 0
            return render(self.request, 'containerization/notAvailable.html', data)
        elif not ProcessUtilities.containerCheck():
            data['OLS'] = 0
            data['notInstalled'] = 1
            return render(self.request, 'containerization/notAvailable.html', data)
        else:
            if self.data == None:
                self.data = {}
            self.data['OLS'] = 0
            self.data['notInstalled'] = 0
            return render(self.request, self.templateName, self.data)

    def submitContainerInstall(self):
        try:
            userID = self.request.session['userID']
            currentACL = ACLManager.loadedACL(userID)

            if currentACL['admin'] == 1:
                pass
            else:
                logging.CyberCPLogFileWriter.statusWriter(ServerStatusUtil.lswsInstallStatusPath,
                                                          'Not authorized to install container packages. [404].',
                                                          1)
                return 0

            mailUtilities.checkHome()

            statusFile = open(ServerStatusUtil.lswsInstallStatusPath, 'w')

            logging.CyberCPLogFileWriter.statusWriter(ServerStatusUtil.lswsInstallStatusPath,
                                                      "Starting Packages Installation..\n", 1)

            command = 'sudo yum install -y libcgroup-tools'
            ServerStatusUtil.executioner(command, statusFile)

            command = 'sudo systemctl enable cgconfig'
            ServerStatusUtil.executioner(command, statusFile)

            command = 'sudo systemctl enable cgred'
            ServerStatusUtil.executioner(command, statusFile)

            logging.CyberCPLogFileWriter.statusWriter(ServerStatusUtil.lswsInstallStatusPath,
                                                      "Packages successfully installed.[200]\n", 1)

        except BaseException, msg:
            logging.CyberCPLogFileWriter.statusWriter(ServerStatusUtil.lswsInstallStatusPath, str(msg) + ' [404].', 1)

    def restartServices(self):
        command = 'sudo systemctl restart cgconfig'
        ProcessUtilities.executioner(command)

        command = 'sudo systemctl restart cgred'
        ProcessUtilities.executioner(command)

    def addTrafficController(self):
        command = 'sudo tc qdisc add dev eth0 root handle 10: htb default 1000'
        #logging.CyberCPLogFileWriter.writeToFile(command)
        ProcessUtilities.executioner(command)

        try:
            command = 'sudo tc class del dev eth0 classid 10:' + str(self.data['classID'])
            # logging.CyberCPLogFileWriter.writeToFile(command)
            ProcessUtilities.executioner(command)
        except:
            pass

        command = 'sudo tc class add dev eth0 parent 10: classid 10:1000 htb rate 100mbit'
        #logging.CyberCPLogFileWriter.writeToFile(command)
        ProcessUtilities.executioner(command)

        command = 'sudo tc class add dev eth0 parent 10: classid 10:' + str(self.data['classID']) + ' htb rate ' + str(self.data['rateLimit'])
        #logging.CyberCPLogFileWriter.writeToFile(command)
        ProcessUtilities.executioner(command)

        #if str(self.data['classID']) == '1':
        #    command = 'sudo tc filter add dev eth0 parent 10: protocol ip prio 10 handle 1: cgroup'
        #else:
        #    command = 'sudo tc filter add dev eth0 parent 10:' + str(
        #        self.data['classID']) + ' protocol ip prio 10 handle 1: cgroup'

        command = 'sudo tc filter add dev eth0 parent 10: protocol ip prio 10 handle 1: cgroup'
        #logging.CyberCPLogFileWriter.writeToFile(command)
        ProcessUtilities.executioner(command)

        self.restartServices()

    def removeLimits(self):
        command = 'sudo tc class del dev eth0 classid 10:' + str(self.data['classID'])
        #logging.CyberCPLogFileWriter.writeToFile(command)
        ProcessUtilities.executioner(command)

        self.restartServices()