# Copyright (c) 2014 Mirantis Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
# implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import uuid

import six

from sahara import conductor
from sahara import context
from sahara.utils import files

conductor = conductor.API


def get_hive_db_password(cluster):
    ctx = context.ctx()
    cluster = conductor.cluster_get(ctx, cluster.id)
    passwd = cluster.extra.get('hive_db_password') if cluster.extra else None
    if passwd:
        return passwd

    passwd = six.text_type(uuid.uuid4())
    extra = cluster.extra.to_dict() if cluster.extra else {}
    extra['hive_db_password'] = passwd
    cluster = conductor.cluster_update(ctx, cluster, {'extra': extra})
    return passwd


def create_hive_database(cluster, remote):
    db_password = get_hive_db_password(cluster)
    create_db_script = files.get_file_text(
        'plugins/cdh/v5/resources/create_hive_db.sql')
    create_db_script = create_db_script % db_password
    script_name = 'create_hive_db.sql'
    remote.write_file_to(script_name, create_db_script)

    psql_cmd = ('PGPASSWORD=$(sudo head -1 /var/lib/cloudera-scm-server-db'
                '/data/generated_password.txt) psql -U cloudera-scm '
                '-h localhost -p 7432 -d scm -f %s') % script_name
    remote.execute_command(psql_cmd)
    remote.execute_command('rm %s' % script_name)