from logging.config import fileConfig
import asyncio

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

from alembic import context

from app.core.config import get_settings
from app.core.database import Base

# Import all models so SQLAlchemy metadata contains all tables
import app.models


config = context.config
settings = get_settings()

# Use DATABASE_URL from .env
config.set_main_option(
    "sqlalchemy.url",
    settings.database_url.replace("%", "%%")
)

# Configure logging if available
if config.config_file_name:
    try:
        fileConfig(config.config_file_name)
    except KeyError:
        pass


# SQLAlchemy metadata
target_metadata = Base.metadata


def run_migrations_offline() -> None:
    """
    Run migrations in 'offline' mode.
    """
    url = config.get_main_option("sqlalchemy.url")

    context.configure(
        url=url,
        target_metadata=target_metadata,
        literal_binds=True,
        dialect_opts={"paramstyle": "named"},
        compare_type=True,
    )

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


def do_run_migrations(connection) -> None:
    """
    Run migrations using an active database connection.
    """
    context.configure(
        connection=connection,
        target_metadata=target_metadata,
        compare_type=True,
    )

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


async def run_async_migrations() -> None:
    """
    Run migrations using SQLAlchemy async engine.
    """
    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:
    """
    Run migrations in online mode.
    """
    asyncio.run(run_async_migrations())


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