"""Alembic environment configuration for async SQLAlchemy."""
import asyncio
from logging.config import fileConfig

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

# Alembic Config object
config = context.config

# Logging configuration
if config.config_file_name is not None:
    fileConfig(config.config_file_name)

# Import all models so Alembic can detect them
import sys
from pathlib import Path

# Add the project root (4 levels up from this file) to sys.path so that
# `src.backend.*` imports resolve when alembic is invoked from anywhere.
_PROJECT_ROOT = Path(__file__).resolve().parents[3]
if str(_PROJECT_ROOT) not in sys.path:
    sys.path.insert(0, str(_PROJECT_ROOT))

from src.backend.config import settings
from src.backend.database import Base

# Override alembic.ini URL with .env settings (keep in sync)
config.set_main_option("sqlalchemy.url", settings.database_url)

# Import all models so they register with Base.metadata
from src.backend.models.orm.user import User  # noqa: F401
from src.backend.models.orm.recipe import Recipe, RecipeVersion  # noqa: F401
from src.backend.models.orm.task import RecipeTask, RecipeSubtask  # noqa: F401
from src.backend.models.orm.measurement import Measurement  # noqa: F401
from src.backend.models.orm.access_log import AccessLog  # noqa: F401
from src.backend.models.orm.setting import SystemSetting, RecipeVersionAudit  # noqa: F401

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"},
    )

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


def do_run_migrations(connection):
    """Run migrations with 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 'online' mode with async engine."""
    connectable = create_async_engine(
        config.get_main_option("sqlalchemy.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:
    """Run migrations in 'online' mode."""
    asyncio.run(run_async_migrations())


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