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

# Add project root to sys.path so "backend.app..." imports work
sys.path.insert(0, str(Path(__file__).resolve().parents[2]))

from alembic import context
from sqlalchemy import pool
from sqlalchemy.ext.asyncio import create_async_engine

from backend.app.core.config import settings
from backend.app.core.database import Base

# Import all models so they register with Base.metadata
from backend.app.models import *  # noqa: F401, F403

config = context.config
config.set_main_option("sqlalchemy.url", settings.DATABASE_URL)

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

target_metadata = Base.metadata


def run_migrations_offline() -> None:
    url = config.get_main_option("sqlalchemy.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):
    context.configure(connection=connection, target_metadata=target_metadata)
    with context.begin_transaction():
        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()