from __future__ import with_statement

import logging
import os
from logging.config import fileConfig

from flask import current_app
from alembic import context

config = context.config

# Safe logging configuration
if config.config_file_name and os.path.exists(config.config_file_name):
    try:
        fileConfig(config.config_file_name, disable_existing_loggers=False)
    except Exception:
        pass

logger = logging.getLogger("alembic.env")

from mikromon import db
from mikromon.models import *  # noqa

target_metadata = db.metadata


def get_url():
    return current_app.config.get("SQLALCHEMY_DATABASE_URI")


def run_migrations_offline():
    url = get_url()

    context.configure(
        url=url,
        target_metadata=target_metadata,
        literal_binds=True,
        compare_type=True,
    )

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


def run_migrations_online():
    connectable = db.engine

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

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


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