"""Alembic environment configuration for async SQLAlchemy engine."""
from __future__ import annotations

import asyncio
from logging.config import fileConfig

from alembic import context
from sqlalchemy import Connection, pool
from sqlalchemy.ext.asyncio import AsyncEngine, async_engine_from_config

from app.core.config import settings
from app.models import Base

config = context.config

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

config.set_main_option("sqlalchemy.url", settings.database_url)

target_metadata = Base.metadata


def run_migrations_offline() -> None:
    """Run migrations without a database connection."""
    context.configure(
        url=settings.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 do_run_migrations(connection: Connection) -> None:
    """Configure Alembic context and run migrations."""
    context.configure(
        connection=connection,
        target_metadata=target_metadata,
        # compare_type=True,
        # compare_server_default=True,
    )

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


async def run_migrations_online() -> None:
    """Run migrations inside an async engine context."""
    configuration = config.get_section(config.config_ini_section) or {}
    connectable = async_engine_from_config(
        configuration,
        prefix="sqlalchemy.",
        poolclass=pool.NullPool,
        future=True,
    )

    assert isinstance(connectable, AsyncEngine)

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

    await connectable.dispose()


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