"""Alembic environment configuration for PromptLooper."""

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

from alembic import context
from sqlalchemy import engine_from_config, pool

# Ensure the backend package is importable
sys.path.insert(0, str(Path(__file__).resolve().parents[1]))

from backend.config import settings
from backend.models import Base

config = context.config

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

# Use sqlalchemy.url from alembic config if already set (e.g. by tests),
# otherwise fall back to application settings.
if not config.get_main_option("sqlalchemy.url"):
    config.set_main_option("sqlalchemy.url", settings.effective_database_url)

target_metadata = Base.metadata


def run_migrations_offline() -> None:
    """Run migrations in 'offline' mode — emit SQL to stdout."""
    url = config.get_main_option("sqlalchemy.url")
    context.configure(
        url=url,
        target_metadata=target_metadata,
        literal_binds=True,
        dialect_opts={"paramstyle": "named"},
        render_as_batch=True,
    )

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


def run_migrations_online() -> None:
    """Run migrations against a live database connection."""
    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,
            render_as_batch=True,
        )

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


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