# pylint: disable=no-member,wrong-import-position
import sys
from logging.config import fileConfig

from sqlalchemy import engine_from_config
from sqlalchemy import pool

from alembic import context

# Modify PYTHONPATH so that we can import the Arlo config
# https://stackoverflow.com/a/58891735
sys.path = ["", ".."] + sys.path[1:]
from server.config import DATABASE_URL

# this is the Alembic Config object, which provides
# access to the values within the .ini file in use.
config = context.config

# Set the db url to use based on the Arlo config
# https://stackoverflow.com/a/37891036
config.set_main_option("sqlalchemy.url", DATABASE_URL)

# Interpret the config file for Python logging.
# This line sets up loggers basically.
fileConfig(config.config_file_name, disable_existing_loggers=False)

# add your model's MetaData object here
# for 'autogenerate' support
# from myapp import mymodel
# target_metadata = mymodel.Base.metadata
from server.database import Base
import server.models  # pylint: disable=unused-import

target_metadata = 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.


def run_migrations_offline():  # pragma: no cover
    """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,
        compare_type=True,
        compare_server_default=True,
        include_schemas=True,
        literal_binds=True,
        dialect_opts={"paramstyle": "named"},
    )

    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 = config.attributes.get("connection", None)

    if connectable is None:  # pragma: no cover
        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)

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


if context.is_offline_mode():
    run_migrations_offline()  # pragma: no cover
else:
    run_migrations_online()
