from alembic import context
from sqlalchemy import engine_from_config, pool

from dbgpt.storage.metadata.db_manager import db

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


# add your model's MetaData object here
# for 'autogenerate' support
# from myapp import mymodel


# 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() -> None:
    """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.

    """
    target_metadata = db.metadata
    url = config.get_main_option("sqlalchemy.url")
    assert target_metadata is not None
    assert url is not None
    context.configure(
        url=url,
        target_metadata=target_metadata,
        literal_binds=True,
        dialect_opts={"paramstyle": "named"},
    )

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


def run_migrations_online() -> None:
    """Run migrations in 'online' mode.

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

    """
    engine = db.engine
    target_metadata = db.metadata
    with engine.connect() as connection:
        if engine.dialect.name == "sqlite":
            context.configure(
                connection=engine.connect(),
                target_metadata=target_metadata,
                render_as_batch=True,
            )
        else:
            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()
