"""Alembic environment for the SaaS identity schema."""

from __future__ import annotations

import os
from logging.config import fileConfig

from alembic import context
from sqlalchemy import pool

from app.db import Base, create_database_engine
from app.models import memory, saas  # noqa: F401 - register models on metadata

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


target_metadata = Base.metadata


def database_url() -> str:
    url = os.environ.get("DATABASE_URL") or config.get_main_option("sqlalchemy.url")
    if not url:
        raise RuntimeError("DATABASE_URL is required for migrations")
    return url


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


def run_migrations_online() -> None:
    connectable = create_database_engine(database_url(), poolclass=pool.NullPool)
    with connectable.connect() as connection:
        context.configure(
            connection=connection,
            target_metadata=target_metadata,
            compare_type=True,
            compare_server_default=True,
        )
        with context.begin_transaction():
            context.run_migrations()


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