from __future__ import annotations

import asyncio
import os
from pathlib import Path

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

from alembic import context
from app.repository import postgres_ssl_context


def migration_url() -> str:
    path = os.getenv("BITRIX_SYNC_MIGRATION_DATABASE_URL_FILE")
    if not path:
        raise RuntimeError("BITRIX_SYNC_MIGRATION_DATABASE_URL_FILE is required")
    value = Path(path).read_text(encoding="utf-8").rstrip("\r\n")
    if not value:
        raise RuntimeError("Bitrix migration database URL file is empty")
    return value


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


async def run_async_migrations() -> None:
    configuration = context.config.get_section(context.config.config_ini_section) or {}
    configuration["sqlalchemy.url"] = migration_url()
    engine = async_engine_from_config(
        configuration,
        prefix="sqlalchemy.",
        poolclass=pool.NullPool,
        connect_args={"ssl": postgres_ssl_context()},
    )

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

    async with engine.connect() as connection:
        await connection.run_sync(run_sync_migrations)
    await engine.dispose()


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