# -*- coding: utf-8 -*-
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
from __future__ import unicode_literals

import os
import sys
import sqlalchemy as sa
from alembic import context


def run_migrations_offline():
    """Run migrations in 'offline' mode.

    This configures the context with just a URL
    and not an Engine, though an Engine is acceptable
    here as well.  By skipping the Engine creation
    we don't even need a DBAPI to be available.

    Calls to context.execute() here emit the given string to the
    script output.

    """
    url = context.config.get_main_option("sqlalchemy.url")
    context.configure(url=url, target_metadata=None, literal_binds=True)
    with context.begin_transaction():
        context.run_migrations()


def run_migrations_online():
    """Run migrations in 'online' mode.

    In this scenario we need to create an Engine
    and associate a connection with the context.

    """
    sys.path.append(os.path.dirname(__file__))
    import config
    connectable = sa.create_engine(config.WAREHOUSE_URL)
    with connectable.connect() as connection:
        context.configure(connection=connection, target_metadata=None)
        with context.begin_transaction():
            context.run_migrations()


# Run migrations
if context.is_offline_mode():
    run_migrations_offline()
else:
    run_migrations_online()
