import asyncio
from logging.config import fileConfig

from sqlalchemy import pool, text
from sqlalchemy.ext.asyncio import create_async_engine

from alembic import context
from app.core.config import settings
from app.db import models  # noqa: F401 — регистрирует все модели в metadata
from app.db.base import Base

config = context.config

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

target_metadata = Base.metadata

_schema = settings.DATABASE_SCHEMA or None


def run_migrations_offline() -> None:
    url = settings.DATABASE_URL
    context.configure(
        url=url,
        target_metadata=target_metadata,
        literal_binds=True,
        dialect_opts={"paramstyle": "named"},
        include_schemas=True,
        version_table_schema=_schema,
    )
    with context.begin_transaction():
        context.run_migrations()


def do_run_migrations(connection):
    context.configure(
        connection=connection,
        target_metadata=target_metadata,
        include_schemas=True,
        version_table_schema=_schema,
        # SQLite не умеет большинство ALTER TABLE — для локальной БД будущие
        # ревизии с изменением колонок пойдут через batch (пересоздание таблицы).
        render_as_batch=connection.dialect.name == "sqlite",
    )
    with context.begin_transaction():
        if _schema:
            context.execute(text(f"CREATE SCHEMA IF NOT EXISTS {_schema}"))
        context.run_migrations()


async def run_async_migrations() -> None:
    connectable = create_async_engine(
        settings.DATABASE_URL,
        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()