#!/usr/bin/env python3
# -*- coding: utf-8 -*-
#
# 2020 Nico Schottelius (nico.schottelius at ungleich.ch)
#
# This file is part of uncloud.
#
# uncloud is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# uncloud is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with uncloud. If not, see <http://www.gnu.org/licenses/>.
#
#

import subprocess
import uuid
import os
import logging

from uncloud.hack.db import DB
from uncloud.hack.mac import MAC


log = logging.getLogger(__name__)

class VM(object):
    def __init__(self, config):
        self.config = config
        #TODO: Enable etcd lookup
        self.no_db = self.config.arguments['no_db']
        if not self.no_db:
             self.db = DB(self.config, prefix="/vm")

        #TODO: Select generic
        #self.hackprefix="/home/nico/vcs/uncloud/uncloud/hack/hackcloud" #TODO: Should be removed midterm
        #self.hackprefix="/home/rouxdo/Work/ungleich/uncloud/uncloud/hack/hackcloud" #TODO: Dominique testing
        self.hackprefix=self.config.arguments['hackprefix']
        self.qemu="/usr/bin/qemu-system-x86_64" #TODO: should be in config
        self.accel="kvm" #TODO: should be config

        self.vm = {}

        #TODO: Touch later! (when necessary)
        self.ifup = os.path.join(self.hackprefix, "ifup.sh")
        self.ifdown = os.path.join(self.hackprefix, "ifdown.sh")

    def commandline(self):
        """This method is used to trigger / create a vm from the cli"""
        #TODO: read arguments from cli
        #TODO: create etcd json object
        self.vm['owner']= "nico"
        self.vm['memory'] = self.config.arguments['memory']
        self.vm['cores'] = self.config.arguments['cores']
        self.vm['os_image'] = os.path.join(self.hackprefix, "alpine-virt-3.11.3-x86_64.iso")
        self.create_template()
        # mimics api call = this will already be in etcd
        #self.vm['os_image'] = self.db.get("os_image")
        self.create()

    def create_template(self):
        self.uuid = uuid.uuid4()
        #TODO: This all should be generic
        self.vm['uuid'] = str(self.uuid)
        #self.vni_hex = "{:x}".format(self.config.arguments['vni'])
        self.bridgedev = "br{}".format("{:x}".format(self.config.arguments['vni']))

        #TODO: Enable sudo -- FIXME!
        if self.config.arguments['use_sudo']:
            self.sudo = "sudo "
        else:
            self.sudo = ""


        self.mac=MAC(self.config)
        self.mac.create()
        self.vm['mac'] = self.mac
        self.vm['ifname'] = "uc{}".format(self.mac.__repr__())

        # FIXME: TODO: turn this into a string and THEN
        # .split() it later -- easier for using .format()
        #self.vm['commandline'] = [ "{}".format(self.sudo),
        self.vm['commandline'] = "{sudo}{qemu} -name uncloud-{uuid} -machine pc,accel={accel} -m {memory} -smp {cores} -uuid {uuid} -drive file={os_image},media=cdrom -netdev tap,id=netmain,script={ifup},downscript={ifdown},ifname={ifname} -device virtio-net-pci,netdev=netmain,id=net0,mac={mac}"
#        self.vm['commandline'] = [ "{}".format(self.sudo),
#                                    "{}".format(self.qemu),
#                                    "-name", "uncloud-{}".format(self.vm['uuid']),
#                                    "-machine", "pc,accel={}".format(self.accel),
#                                    "-m", "{}".format(self.vm['memory']),
#                                    "-smp", "{}".format(self.vm['cores']),
#                                    "-uuid", "{}".format(self.vm['uuid']),
#                                    "-drive", "file={},media=cdrom".format(self.vm['os_image']),
#                                    "-netdev", "tap,id=netmain,script={},downscript={},ifname={}".format(self.ifup, self.ifdown, self.vm['ifname']),
#                                    "-device", "virtio-net-pci,netdev=netmain,id=net0,mac={}".format(self.vm['mac'])
#        ]

    def _execute_cmd(self, cmd_string, **kwargs):
        cmd = cmd_string.format(**self.vm, **kwargs)
        log.info("Executing: {}".format(cmd))
        subprocess.run(cmd.split())

    def create(self):
        if not self.no_db:
            self.db.set(str(self.vm['uuid']),
                       self.vm,
                       as_json=True)

        self._execute_cmd(self.vm['commandline'], sudo=self.sudo, qemu=self.qemu, accel=self.accel, ifup=self.ifup, ifdown=self.ifdown)
        #TODO: Add interface ifname to bridge brXX (via net.py: public function add iface to bridge)