"""Alembic migration environment configuration."""

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 daemon_boyfriend.config import settings
from daemon_boyfriend.models import Base

# this is the Alembic Config object
config = context.config

# Interpret the config file for Python logging
if config.config_file_name is not None:
    fileConfig(config.config_file_name)

# Model metadata for autogenerate support
target_metadata = Base.metadata


def get_url() -> str:
    """Get database URL from settings."""
    url = settings.database_url
    if not url:
        raise ValueError("DATABASE_URL must be set for migrations")
    return url


def run_migrations_offline() -> None:
    """Run migrations in 'offline' mode.

    This configures the context with just a URL and not an Engine,
    though an Engine is acceptable here as well. By skipping the Engine creation
    we don't even need a DBAPI to be available.

    Calls to context.execute() here emit the given string to the script output.
    """
    url = get_url()
    context.configure(
        url=url,
        target_metadata=target_metadata,
        literal_binds=True,
        dialect_opts={"paramstyle": "named"},
    )

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


def do_run_migrations(connection) -> None:
    """Run migrations with the given connection."""
    context.configure(connection=connection, target_metadata=target_metadata)

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


async def run_async_migrations() -> None:
    """Run migrations in async mode."""
    configuration = config.get_section(config.config_ini_section, {})
    configuration["sqlalchemy.url"] = get_url()

    connectable = async_engine_from_config(
        configuration,
        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:
    """Run migrations in 'online' mode."""
    asyncio.run(run_async_migrations())


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