from __future__ import annotations

import asyncio
import os
from logging.config import fileConfig

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

from script_build_host.infrastructure.tables import metadata

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


def _database_url() -> str:
    arguments = context.get_x_argument(as_dictionary=True)
    value = arguments.get("database_url") or os.getenv("SCRIPT_BUILD_WRITE_DATABASE_URL")
    if not value:
        raise RuntimeError(
            "migration database URL is required via -x database_url=... or "
            "SCRIPT_BUILD_WRITE_DATABASE_URL"
        )
    return value


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


def _run_migrations(connection: object) -> None:
    context.configure(connection=connection, target_metadata=target_metadata, compare_type=True)
    with context.begin_transaction():
        context.run_migrations()


async def run_migrations_online() -> None:
    configuration = config.get_section(config.config_ini_section, {})
    configuration["sqlalchemy.url"] = _database_url()
    engine = async_engine_from_config(configuration, prefix="sqlalchemy.", poolclass=pool.NullPool)
    async with engine.connect() as connection:
        await connection.run_sync(_run_migrations)
    await engine.dispose()


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