import asyncio
from logging.config import fileConfig

from sqlalchemy import pool
from sqlalchemy.engine import Connection
from sqlalchemy.ext.asyncio import async_engine_from_config

from alembic import context

from app.config import settings
from app.database import Base

# Import all models so their tables are registered on Base.metadata
from app.models import game_cache as _game_cache  # noqa: F401
from app.models import character_snapshot as _snapshot  # noqa: F401
from app.models import automation as _automation  # noqa: F401

# Alembic Config object
config = context.config

# Override sqlalchemy.url with value from application settings
config.set_main_option("sqlalchemy.url", settings.database_url)

# Set up Python logging from the .ini file
if config.config_file_name is not None:
    fileConfig(config.config_file_name)

# MetaData for autogenerate support
target_metadata = Base.metadata


def run_migrations_offline() -> None:
    """Run migrations in 'offline' mode.

    Generates SQL scripts without connecting to the database.
    """
    url = config.get_main_option("sqlalchemy.url")
    context.configure(
        url=url,
        target_metadata=target_metadata,
        literal_binds=True,
        dialect_opts={"paramstyle": "named"},
    )

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


def do_run_migrations(connection: Connection) -> None:
    context.configure(connection=connection, target_metadata=target_metadata)

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


async def run_async_migrations() -> None:
    """Run migrations in 'online' mode using an async engine."""
    connectable = async_engine_from_config(
        config.get_section(config.config_ini_section, {}),
        prefix="sqlalchemy.",
        poolclass=pool.NullPool,
    )

    async with connectable.connect() as connection:
        await connection.run_sync(do_run_migrations)

    await connectable.dispose()


def run_migrations_online() -> None:
    """Entry point for online migrations -- delegates to async runner."""
    asyncio.run(run_async_migrations())


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