import os
from logging.config import fileConfig

from alembic import context
from app.bootstrap.settings import ModelGatewayServiceSettings
from app.db.models import Base
from sqlalchemy import engine_from_config, pool

SERVICE_VERSION_TABLE = "model_gateway_alembic_version"

config = context.config

if config.config_file_name is not None:
    fileConfig(config.config_file_name)

database_url = (
    os.getenv("AGENT_PLATFORM_DATABASE_URL")
    or ModelGatewayServiceSettings().database_url
)
config.set_main_option("sqlalchemy.url", database_url.replace("%", "%%"))
target_metadata = Base.metadata


def run_migrations_offline() -> None:
    url = config.get_main_option("sqlalchemy.url")
    context.configure(
        url=url,
        target_metadata=target_metadata,
        literal_binds=True,
        version_table=SERVICE_VERSION_TABLE,
    )

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


def run_migrations_online() -> None:
    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,
            version_table=SERVICE_VERSION_TABLE,
        )

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


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