#!/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 uuid

from uncloud.hack.db import DB
from uncloud import UncloudException

class Host(object):
    def __init__(self, config, db_entry=None):
        self.config = config
        self.db = DB(self.config, prefix="/hosts")

        if db_entry:
            self.db_entry = db_entry


    def list_hosts(self, filter_key=None, filter_regexp=None):
        """ Return list of all hosts """
        for entry in self.db.list_and_filter("", filter_key, filter_regexp):
            yield self.__class__(self.config, db_entry=entry)

    def cmdline_add_host(self):
        """ FIXME: make this a bit smarter and less redundant """

        for required_arg in [
                'add_vm_host',
                'max_cores_per_vm',
                'max_cores_total',
                'max_memory_in_gb' ]:
            if not required_arg in self.config.arguments:
                raise UncloudException("Missing argument: {}".format(required_arg))

        return self.add_host(
                self.config.arguments['add_vm_host'],
                self.config.arguments['max_cores_per_vm'],
                self.config.arguments['max_cores_total'],
                self.config.arguments['max_memory_in_gb'])


    def add_host(self,
                 hostname,
                 max_cores_per_vm,
                 max_cores_total,
                 max_memory_in_gb):

        db_entry = {}
        db_entry['uuid'] = str(uuid.uuid4())
        db_entry['hostname'] = hostname
        db_entry['max_cores_per_vm'] = max_cores_per_vm
        db_entry['max_cores_total'] = max_cores_total
        db_entry['max_memory_in_gb'] = max_memory_in_gb
        db_entry["db_version"] = 1
        db_entry["log"] = []

        self.db.set(db_entry['uuid'], db_entry, as_json=True)

        return self.__class__(self.config, db_entry)