# Copyright 2012 OpenStack Foundation
#
#    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.

from oslo_log import log as logging
from sqlalchemy import Boolean, Column, DateTime, ForeignKey
from sqlalchemy import Integer, MetaData, String, Table

from cinder.i18n import _


LOG = logging.getLogger(__name__)


def define_tables(meta):
    migrations = Table(
        'migrations', meta,
        Column('created_at', DateTime),
        Column('updated_at', DateTime),
        Column('deleted_at', DateTime),
        Column('deleted', Boolean),
        Column('id', Integer, primary_key=True, nullable=False),
        Column('source_compute', String(length=255)),
        Column('dest_compute', String(length=255)),
        Column('dest_host', String(length=255)),
        Column('status', String(length=255)),
        Column('instance_uuid', String(length=255)),
        Column('old_instance_type_id', Integer),
        Column('new_instance_type_id', Integer),
        mysql_engine='InnoDB'
    )

    services = Table(
        'services', meta,
        Column('created_at', DateTime),
        Column('updated_at', DateTime),
        Column('deleted_at', DateTime),
        Column('deleted', Boolean),
        Column('id', Integer, primary_key=True, nullable=False),
        Column('host', String(length=255)),
        Column('binary', String(length=255)),
        Column('topic', String(length=255)),
        Column('report_count', Integer, nullable=False),
        Column('disabled', Boolean),
        Column('availability_zone', String(length=255)),
        mysql_engine='InnoDB'
    )

    sm_flavors = Table(
        'sm_flavors', meta,
        Column('created_at', DateTime),
        Column('updated_at', DateTime),
        Column('deleted_at', DateTime),
        Column('deleted', Boolean),
        Column('id', Integer, primary_key=True, nullable=False),
        Column('label', String(length=255)),
        Column('description', String(length=255)),
        mysql_engine='InnoDB'
    )

    sm_backend_config = Table(
        'sm_backend_config', meta,
        Column('created_at', DateTime),
        Column('updated_at', DateTime),
        Column('deleted_at', DateTime),
        Column('deleted', Boolean),
        Column('id', Integer, primary_key=True, nullable=False),
        Column('flavor_id', Integer, ForeignKey('sm_flavors.id'),
               nullable=False),
        Column('sr_uuid', String(length=255)),
        Column('sr_type', String(length=255)),
        Column('config_params', String(length=2047)),
        mysql_engine='InnoDB'
    )

    sm_volume = Table(
        'sm_volume', meta,
        Column('created_at', DateTime),
        Column('updated_at', DateTime),
        Column('deleted_at', DateTime),
        Column('deleted', Boolean),
        Column('id', String(length=36),
               ForeignKey('volumes.id'),
               primary_key=True,
               nullable=False),
        Column('backend_id', Integer, ForeignKey('sm_backend_config.id'),
               nullable=False),
        Column('vdi_uuid', String(length=255)),
        mysql_engine='InnoDB'
    )

    snapshots = Table(
        'snapshots', meta,
        Column('created_at', DateTime),
        Column('updated_at', DateTime),
        Column('deleted_at', DateTime),
        Column('deleted', Boolean),
        Column('id', String(length=36), primary_key=True, nullable=False),
        Column('volume_id', String(length=36), nullable=False),
        Column('user_id', String(length=255)),
        Column('project_id', String(length=255)),
        Column('status', String(length=255)),
        Column('progress', String(length=255)),
        Column('volume_size', Integer),
        Column('scheduled_at', DateTime),
        Column('display_name', String(length=255)),
        Column('display_description', String(length=255)),
        mysql_engine='InnoDB'
    )

    volume_types = Table(
        'volume_types', meta,
        Column('created_at', DateTime),
        Column('updated_at', DateTime),
        Column('deleted_at', DateTime),
        Column('deleted', Boolean),
        Column('id', Integer, primary_key=True, nullable=False),
        Column('name', String(length=255)),
        mysql_engine='InnoDB'
    )

    volume_metadata = Table(
        'volume_metadata', meta,
        Column('created_at', DateTime),
        Column('updated_at', DateTime),
        Column('deleted_at', DateTime),
        Column('deleted', Boolean),
        Column('id', Integer, primary_key=True, nullable=False),
        Column('volume_id', String(length=36), ForeignKey('volumes.id'),
               nullable=False),
        Column('key', String(length=255)),
        Column('value', String(length=255)),
        mysql_engine='InnoDB'
    )

    volume_type_extra_specs = Table(
        'volume_type_extra_specs', meta,
        Column('created_at', DateTime),
        Column('updated_at', DateTime),
        Column('deleted_at', DateTime),
        Column('deleted', Boolean),
        Column('id', Integer, primary_key=True, nullable=False),
        Column('volume_type_id', Integer, ForeignKey('volume_types.id'),
               nullable=False),
        Column('key', String(length=255)),
        Column('value', String(length=255)),
        mysql_engine='InnoDB'
    )

    volumes = Table(
        'volumes', meta,
        Column('created_at', DateTime),
        Column('updated_at', DateTime),
        Column('deleted_at', DateTime),
        Column('deleted', Boolean),
        Column('id', String(length=36), primary_key=True, nullable=False),
        Column('ec2_id', String(length=255)),
        Column('user_id', String(length=255)),
        Column('project_id', String(length=255)),
        Column('host', String(length=255)),
        Column('size', Integer),
        Column('availability_zone', String(length=255)),
        Column('instance_uuid', String(length=36)),
        Column('mountpoint', String(length=255)),
        Column('attach_time', String(length=255)),
        Column('status', String(length=255)),
        Column('attach_status', String(length=255)),
        Column('scheduled_at', DateTime),
        Column('launched_at', DateTime),
        Column('terminated_at', DateTime),
        Column('display_name', String(length=255)),
        Column('display_description', String(length=255)),
        Column('provider_location', String(length=256)),
        Column('provider_auth', String(length=256)),
        Column('snapshot_id', String(length=36)),
        Column('volume_type_id', Integer),
        mysql_engine='InnoDB'
    )

    quotas = Table(
        'quotas', meta,
        Column('id', Integer, primary_key=True, nullable=False),
        Column('created_at', DateTime),
        Column('updated_at', DateTime),
        Column('deleted_at', DateTime),
        Column('deleted', Boolean),
        Column('project_id', String(length=255)),
        Column('resource', String(length=255), nullable=False),
        Column('hard_limit', Integer),
        mysql_engine='InnoDB'
    )

    iscsi_targets = Table(
        'iscsi_targets', meta,
        Column('created_at', DateTime),
        Column('updated_at', DateTime),
        Column('deleted_at', DateTime),
        Column('deleted', Boolean),
        Column('id', Integer, primary_key=True, nullable=False),
        Column('target_num', Integer),
        Column('host', String(length=255)),
        Column('volume_id', String(length=36), ForeignKey('volumes.id'),
               nullable=True),
        mysql_engine='InnoDB'
    )
    return [sm_flavors,
            sm_backend_config,
            snapshots,
            volume_types,
            volumes,
            iscsi_targets,
            migrations,
            quotas,
            services,
            sm_volume,
            volume_metadata,
            volume_type_extra_specs]


def upgrade(migrate_engine):
    meta = MetaData()
    meta.bind = migrate_engine

    # create all tables
    # Take care on create order for those with FK dependencies
    tables = define_tables(meta)

    for table in tables:
        try:
            table.create()
        except Exception:
            LOG.info(repr(table))
            LOG.exception(_('Exception while creating table.'))
            raise

    if migrate_engine.name == "mysql":
        tables = ["sm_flavors",
                  "sm_backend_config",
                  "snapshots",
                  "volume_types",
                  "volumes",
                  "iscsi_targets",
                  "migrate_version",
                  "migrations",
                  "quotas",
                  "services",
                  "sm_volume",
                  "volume_metadata",
                  "volume_type_extra_specs"]

        migrate_engine.execute("SET foreign_key_checks = 0")
        for table in tables:
            migrate_engine.execute(
                "ALTER TABLE %s CONVERT TO CHARACTER SET utf8" % table)
        migrate_engine.execute("SET foreign_key_checks = 1")
        migrate_engine.execute(
            "ALTER DATABASE %s DEFAULT CHARACTER SET utf8" %
            migrate_engine.url.database)
        migrate_engine.execute("ALTER TABLE %s Engine=InnoDB" % table)


def downgrade(migrate_engine):
    meta = MetaData()
    meta.bind = migrate_engine
    tables = define_tables(meta)
    tables.reverse()
    for table in tables:
        LOG.info("dropping table %(table)s" % {'table': table})
        table.drop()
