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

from sqlalchemy import engine_from_config, pool
from alembic import context

# Ensure `backend/` is on sys.path so `import app...` works
# no matter where `alembic` is executed from.
BACKEND_ROOT = Path(__file__).resolve().parents[1]
if str(BACKEND_ROOT) not in sys.path:
    sys.path.insert(0, str(BACKEND_ROOT))

from app.core.config import settings
from app.core.database import Base
import app.models  # noqa: F401 – ensure all models are imported

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

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

target_metadata = Base.metadata


def run_migrations_offline():
    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 run_migrations_online():
    connectable = engine_from_config(
        config.get_section(config.config_ini_section, {}),
        prefix="sqlalchemy.",
        poolclass=pool.NullPool,
    )
    with connectable.connect() as connection:
        context.configure(connection=connection, target_metadata=target_metadata)
        with context.begin_transaction():
            context.run_migrations()


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