"""Alembic environment (assistant DB URL from env)."""

from __future__ import annotations

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

from sqlalchemy import engine_from_config, pool, text
from sqlalchemy.engine import Connection

from alembic import context

ROOT = Path(__file__).resolve().parents[1]
if str(ROOT) not in sys.path:
    sys.path.insert(0, str(ROOT))

os.chdir(ROOT)

from svc.config.bootstrap_env import load_system_env  # noqa: E402

load_system_env()

from svc.config.database import assistant_db_backend, assistant_sqlalchemy_url  # noqa: E402

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

target_metadata = None


def get_url() -> str:
    return assistant_sqlalchemy_url()


def run_migrations_offline() -> None:
    context.configure(
        url=get_url(),
        target_metadata=target_metadata,
        literal_binds=True,
        dialect_opts={"paramstyle": "named"},
    )
    with context.begin_transaction():
        context.run_migrations()


def run_migrations_online() -> None:
    ini_section = config.get_section(config.config_ini_section) or {}
    ini_section["sqlalchemy.url"] = get_url()
    connectable = engine_from_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()