"""Alembic environment for the async SQLAlchemy application.

The database URL and all other settings come from ``app.config.Settings`` so
migrations use exactly the same validation and environment file as the bot.
"""

from __future__ import annotations

import asyncio
from logging.config import fileConfig

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

from alembic import context
from app.config import Settings
from app.database import models  # noqa: F401  (register all ORM models)
from app.database.base import Base

config = context.config

if config.config_file_name is not None:
    fileConfig(config.config_file_name, disable_existing_loggers=False)

settings = Settings()
# Alembic's ConfigParser treats '%' as interpolation syntax.
config.set_main_option("sqlalchemy.url", settings.database_url.replace("%", "%%"))

target_metadata = Base.metadata


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


def do_run_migrations(connection) -> None:  # type: ignore[no-untyped-def]
    context.configure(
        connection=connection,
        target_metadata=target_metadata,
        compare_type=True,
        render_as_batch=True,
    )
    with context.begin_transaction():
        context.run_migrations()


async def run_async_migrations() -> None:
    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:
    asyncio.run(run_async_migrations())


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