import logging
from sqlalchemy import *
from sqlalchemy.engine import reflection

from alembic.migration import MigrationContext
from alembic.operations import Operations

from rhodecode.lib.dbmigrate.versions import _reset_base
from rhodecode.model import meta, init_model_encryption


log = logging.getLogger(__name__)


def _get_indexes_list(migrate_engine, table_name):
    inspector = reflection.Inspector.from_engine(migrate_engine)
    return inspector.get_indexes(table_name)


def upgrade(migrate_engine):
    """
    Upgrade operations go here.
    Don't create your own engine; bind migrate_engine to your metadata
    """
    _reset_base(migrate_engine)
    from rhodecode.lib.dbmigrate.schema import db_4_20_0_0

    init_model_encryption(db_4_20_0_0)

    # make sure we re-create api-keys indexes

    context = MigrationContext.configure(migrate_engine.connect())
    op = Operations(context)

    existing_indexes = _get_indexes_list(
        migrate_engine, db_4_20_0_0.CacheKey.__tablename__)

    names = [idx['name'] for idx in existing_indexes]

    with op.batch_alter_table(db_4_20_0_0.CacheKey.__tablename__) as batch_op:
        if 'cache_args_idx' not in names:
            batch_op.create_index(
             'cache_args_idx', ['cache_args'])


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


def fixups(models, _SESSION):
    pass