from __future__ import with_statement

import os

from alembic import context

from sqlalchemy import create_engine, pool

from logging.config import fileConfig

# this is the Alembic Config object, which provides

# access to the values within the .ini file in use.

config = context.config

# Interpret the config file for Python logging.

# This line sets up loggers basically.

fileConfig(config.config_file_name)

if 'PAGURE_CONFIG' not in os.environ \

        and os.path.exists('/etc/pagure/pagure.cfg'):

    print 'Using configuration file `/etc/pagure/pagure.cfg`'

    os.environ['PAGURE_CONFIG'] = '/etc/pagure/pagure.cfg'

try:

    import pagure

    import pagure.lib.model

except ImportError:

    import sys

    sys.path.insert(0, '.')

    import pagure

    import pagure.lib.model

# add your model's MetaData object here

# for 'autogenerate' support

target_metadata = pagure.lib.model.BASE.metadata

# other values from the config, defined by the needs of env.py,

# can be acquired:

# my_important_option = config.get_main_option("my_important_option")

# ... etc.

DBURL = config.get_main_option("sqlalchemy.url")

if not DBURL:

    DBURL = pagure.APP.config['DB_URL']

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.

    """

    context.configure(url=DBURL, target_metadata=target_metadata)

    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.

    """

    connectable = create_engine(DBURL, poolclass=pool.NullPool)

    with connectable.connect() as connection:

        context.configure(

            connection=connection,

            target_metadata=target_metadata

        )

        with context.begin_transaction():

            context.run_migrations()

if context.is_offline_mode():

    run_migrations_offline()

else:

    run_migrations_online()