"""
Alembic environment configuration - Async support
"""

import os
import sys
import asyncio
from logging.config import fileConfig

from sqlalchemy import pool
from sqlalchemy.engine import Connection
from sqlalchemy.ext.asyncio import create_async_engine

from alembic import context

sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))

config = context.config

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

from database.models import Base
from database.utils import convert_to_async_url

target_metadata = Base.metadata

from dotenv import load_dotenv

load_dotenv()

# Use config so DATABASE_URL is built from POSTGRES_* when set (Story 6.6)
import config as _app_config  # noqa: E402, F401

DATABASE_URL = os.getenv("DATABASE_URL", "")
if not DATABASE_URL:
    SQLITE_PATH = os.getenv("SQLITE_PATH", "data/translate.db")
    DATABASE_URL = f"sqlite:///./{SQLITE_PATH}"


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

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


def do_run_migrations(connection: Connection) -> None:
    """Run migrations with the given connection"""
    context.configure(
        connection=connection, target_metadata=target_metadata, compare_type=True
    )

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


async def run_async_migrations() -> None:
    """Run migrations in async mode"""
    async_url = convert_to_async_url(DATABASE_URL)
    connectable = create_async_engine(
        async_url,
        poolclass=pool.NullPool,
    )

    async with connectable.connect() as connection:
        await connection.run_sync(do_run_migrations)

    await connectable.dispose()


def run_migrations_online() -> None:
    """Run migrations in 'online' mode with async support."""
    asyncio.run(run_async_migrations())


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