import sys
from logging.config import fileConfig
from pathlib import Path

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

from alembic import context

# Add app directory to path so we can import models/database
sys.path.insert(0, str(Path(__file__).parent.parent / "app"))

from database import metadata, DATABASE_URL

config = context.config
# Prefer the app's env-driven DATABASE_URL over the ini placeholder so
# migrations always target the same database the app connects to.
config.set_main_option("sqlalchemy.url", DATABASE_URL)
if config.config_file_name is not None:
    fileConfig(config.config_file_name)
target_metadata = 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)
    with context.begin_transaction():
        context.run_migrations()


def do_run_migrations(connection):
    context.configure(connection=connection, target_metadata=target_metadata)
    with context.begin_transaction():
        context.run_migrations()


async def run_async_migrations():
    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."""
    import asyncio
    asyncio.run(run_async_migrations())


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