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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 print_function
from __future__ import absolute_import
from past.builtins import basestring
from uuid import uuid4

from clcommon.clconfpars import load, change_settings

from lvestats.lib import config
from lvestats.lib import lveinfolib
from lvestats.orm.history import history, history_x60
from lvestats.orm.history_gov import history_gov
from lvestats.orm.incident import incident
from lvestats.orm.servers import servers
from lvestats.orm.user import user
from past.builtins import raw_input


class UpdateOrCreateServerID(object):
    """Change old-style server ID 'localhost' to auto-generated uuid
    User can set his own server ID
    """

    restricted_server_id_list = ('localhost',)
    server_id_length = 10

    def __init__(self, engine, config_path=None):
        """
        :type engine: sqlalchemy.engine.base.Engine
        :type config_path: Union[str, None]
        """
        self.engine = engine
        self.config_path = config_path or config.GLOBAL_CONFIG_LOCATION

    def _get_current_server_id_cfg(self):
        """
        :rtype: Union[None, str]
        """
        try:
            cfg = load(path=self.config_path)
            return cfg.get('server_id')
        except Exception as e:
            print('Error: {0}'.format(e))
            return None

    def _set_server_id_cfg(self, server_id):
        """Sets option 'server_id' in config file
        :type server_id: str
        :rtype: Union[None, str]
        """
        try:
            change_settings({'server_id': server_id}, self.config_path)
            return server_id
        except Exception as e:
            print('Error: {0}'.format(e))
            return None

    def _update_server_id_table(self, conn, table, current_server_id, new_server_id):
        """
        updates server_id in one of the tables
        :type conn: sqlalchemy.engine.base.Connection
        :type table: Union[history, history_gov, incident, user, history_x60]
        :type current_server_id: str
        :type new_server_id: str
        """
        sql_update = table.__table__.update().where(
            table.server_id == current_server_id
        )
        conn.execute(sql_update.values(
            {'server_id': new_server_id}
        ))

    def _update_server_id_db(self, current_server_id, new_server_id):
        """
        updates server_id for all tables in the database
        :type current_server_id: str
        :type new_server_id: str
        :rtype: Union[None, str]
        """
        sql_tables = [history, history_gov, incident, user, history_x60]
        lve_version = lveinfolib.get_lve_version(self.engine, current_server_id)
        conn = self.engine.connect()
        tx = conn.begin()
        try:
            for table in sql_tables:
                self._update_server_id_table(conn, table, current_server_id, new_server_id)

            # update servers table, where server_id is a primary key
            conn.execute(servers.__table__.insert().values(
                {'server_id': new_server_id, "lve_version": lve_version}
            ))
            conn.execute(servers.__table__.delete().where(servers.server_id == current_server_id))
        except Exception as e:
            tx.rollback()
            conn.close()
            print('Error: {0}'.format(e))
            return None
        else:
            tx.commit()
            conn.close()
            return new_server_id

    def _resolve_localhost(self, prompt=True, current_server_id=None):
        """
        :type current_server_id: Union[None, str]
        :type prompt: bool
        :rtype: Union[None, str]
        """
        server_id = str(uuid4())[:self.server_id_length]
        if prompt:
            res = raw_input('Enter new server ID [\'{0}\']: '.format(server_id))
            print(res)
            if res:
                server_id = res.strip()
            if server_id in self.restricted_server_id_list:
                print('Server ID cannot be \'{0}\''.format(server_id))
                return None
            if server_id == current_server_id:
                print("Server ID is already set to '{0}'".format(server_id))
                return server_id
            if len(server_id) > 255:
                print("Server ID length should be less than 255")
                return None
        cur_server_id = self._get_current_server_id_cfg()
        if cur_server_id is not None and not prompt and \
                cur_server_id not in self.restricted_server_id_list:
            return cur_server_id
        if self._update_server_id_db(current_server_id or cur_server_id or 'localhost', server_id):
            return self._set_server_id_cfg(server_id)
        return server_id

    def prompt(self):
        """
        :rtype: Union[None, str]
        """
        cur_cfg_server_id = self._get_current_server_id_cfg()
        # if server ID = 'localhost'
        if isinstance(cur_cfg_server_id, basestring) and \
                cur_cfg_server_id.strip() in self.restricted_server_id_list:
            print('Server ID cannot be \'{0}\''.format(cur_cfg_server_id))
        return self._resolve_localhost(current_server_id=cur_cfg_server_id)

    def auto(self):
        """
        :rtype: Union[None, str]
        """
        return self._resolve_localhost(prompt=False)