"""Alembic-Umgebung.

Nutzt die Engine und die Metadaten der Anwendung (SQLite), damit Migrationen und
Laufzeit garantiert dieselbe Datenbank/dasselbe Schema verwenden. ``render_as_batch``
ist für SQLite Pflicht, damit ALTER-TABLE über Tabellen-Kopien läuft.
"""

from logging.config import fileConfig

from alembic import context

from app.database import Base, engine
from app import models  # noqa: F401  – registriert alle Tabellen an Base.metadata

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

target_metadata = Base.metadata


def run_migrations_offline() -> None:
    context.configure(
        url=str(engine.url),
        target_metadata=target_metadata,
        literal_binds=True,
        dialect_opts={"paramstyle": "named"},
        render_as_batch=True,
        compare_type=True,
    )
    with context.begin_transaction():
        context.run_migrations()


def run_migrations_online() -> None:
    with engine.connect() as connection:
        context.configure(
            connection=connection,
            target_metadata=target_metadata,
            render_as_batch=True,
            compare_type=True,
        )
        with context.begin_transaction():
            context.run_migrations()


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