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# 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 absolute_import
import logging
from lvestats.core.plugin import LveStatsPlugin
from lvestats.orm import user as user_class
from sqlalchemy import insert, select
from lvestats.lib.commons.func import get_chunks
from lvestats.orm.history import history
from lvestats.orm.servers import servers
from sqlalchemy.orm import sessionmaker
from lvestats.lib.commons.func import reboot_lock


class DBSaver(LveStatsPlugin):
    def __init__(self):
        self.log = logging.getLogger('plugin.DBSaver')
        self.now = 0               # This changes in MainLoop
        self.config = None
        self.period = 60
        self.server_id = 'localhost'

    def set_config(self, config):
        self.period = int(config.get('db_timeout', self.period))
        self.server_id = config.get('server_id', self.server_id)

    def execute(self, lve_data):
        sql_insert_query = insert(history)

        sql_select_servers = select([servers]).where(servers.server_id == self.server_id)
        sql_insert_servers = insert(servers)
        sql_update_servers = servers.__table__.update().where(servers.server_id == self.server_id)

        with reboot_lock():
            conn = self.engine.connect()
            tx = conn.begin()
            try:
                row = conn.execute(sql_select_servers)
                if row.returns_rows:
                    res = row.fetchone()
                    if res is not None:
                        if res['lve_version'] != lve_data['LVE_VERSION']:
                            conn.execute(sql_update_servers.values({'lve_version': lve_data['LVE_VERSION']}))
                    else:
                        conn.execute(
                            sql_insert_servers,
                            server_id=self.server_id,
                            lve_version=lve_data['LVE_VERSION'])
                else:
                    conn.execute(
                        sql_insert_servers,
                        server_id=self.server_id,
                        lve_version=lve_data['LVE_VERSION'])

                sql_insert_list = []
                for lve_id, v in lve_data.get('lve_usage', {}).items():
                    sql_insert_list.append(dict(
                        id=lve_id,
                        cpu=int(round(v.cpu_usage)),  # pylint: disable=round-builtin
                        cpu_limit=v.lcpu,
                        cpu_fault=v.cpu_fault,
                        mep=v.mep,
                        mep_limit=v.lep,
                        io=int(round(v.io_usage)),  # pylint: disable=round-builtin
                        io_limit=v.io,
                        mem=int(round(v.mem_usage)),  # pylint: disable=round-builtin
                        mem_limit=v.lmem,
                        mem_fault=v.mem_fault,
                        mep_fault=v.mep_fault,
                        created=int(round(self.now)),  # pylint: disable=round-builtin
                        server_id=self.server_id,
                        lmemphy=v.lmemphy,
                        memphy=int(round(v.memphy)),  # pylint: disable=round-builtin
                        memphy_fault=v.memphy_fault,
                        lnproc=v.lnproc,
                        nproc=int(round(v.nproc)),  # pylint: disable=round-builtin
                        nproc_fault=v.nproc_fault,
                        io_fault=v.io_fault,
                        iops_fault=v.iops_fault,
                        liops=v.liops,
                        iops=int(round(v.iops))))  # pylint: disable=round-builtin

                for chunk in get_chunks(sql_insert_list):
                    conn.execute(sql_insert_query, chunk)
                tx.commit()
            except:
                tx.rollback()
                raise
            finally:
                conn.close()


class DbUsernamesSaver(LveStatsPlugin):
    def __init__(self):
        self.period = 60*60  # once an hour
        self.engine = None
        self.enabled = True

    def set_config(self, config):
        self.enabled = config.get('collect_usernames', 'false').lower() == 'true'

    def set_db_engine(self, engine):
        self.engine = engine

    def execute(self, lve_data):
        if self.enabled:
            session = sessionmaker(bind=self.engine)()
            for user_info in lve_data['users']:
                user = user_class()
                user.uid, user.user_name, user.server_id = user_info
                try:
                    session.merge(user)
                    session.flush()
                except:  # workaround for sqlalchemy could not deal with complex key on detecting duplicates when merge
                    session.rollback()

            session.commit()
            session.close()
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