from __future__ import with_statement
import sys
sys.path.insert(0, '.')


import os
from alembic import context
from sqlalchemy import engine_from_config, 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)

# tak url from env vars

# this will overwrite the ini-file sqlalchemy.url path
# with the path given in the config of the main code
db_uri = os.environ['WL_PG_URI']
config.set_main_option('sqlalchemy.url', db_uri)
print("Alembic applying to {}".format(db_uri))
if 'localhost' not in db_uri:
    print("!!! Warning, this is not a local db, are you sure you want to apply?")
    yorn = input("y/n ")
    if yorn.lower() not in ('y', 'yes'):
        import sys
        print("Aborting!")
        sys.exit(1)

# add your model's MetaData object here
# for 'autogenerate' support
# from myapp import mymodel
# target_metadata = mymodel.Base.metadata
from tracker.db import JsonBase
target_metadata = JsonBase.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.


# https://gist.github.com/utek/6163250
def include_object(object, name, type_, reflected, compare_to):
    # [alembic:exclude]
    # tables = spatial_ref_sys
    # exclude_tables = config.get_section('alembic:exclude').get('tables', '').split(',')
    if (type_ == "table" and
            any(name.startswith(t) for t in ['django_', 'auth_', 'stats_', 'ds_', 'sc_track_stats', 'admin_table_stats', 'spy_artist_listener_cities', 'spy_artist_listener_playlists', 'kworb_apple_music_charts'])):
        return False
    else:
        return True

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 = config.get_main_option("sqlalchemy.url")
    context.configure(
        url=url, target_metadata=target_metadata, literal_binds=True, include_object=include_object)

    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 = engine_from_config(
        config.get_section(config.config_ini_section),
        prefix='sqlalchemy.',
        poolclass=pool.NullPool)

    with connectable.connect() as connection:
        context.configure(
            connection=connection,
            target_metadata=target_metadata,
            include_object=include_object,
        )

        with context.begin_transaction():
            context.run_migrations()

if context.is_offline_mode():
    run_migrations_offline()
else:
    run_migrations_online()