import asyncio
from logging.config import fileConfig
from sqlalchemy import pool
from sqlalchemy.engine import Connection
from sqlalchemy.ext.asyncio import async_engine_from_config
from alembic import context
from roundtable.models.base import Base
import roundtable.models  # noqa: F401 — registers all models in metadata

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

target_metadata = Base.metadata


def get_url() -> str:
    import os, yaml

    def _env(suffix: str) -> str | None:
        return os.environ.get(f"ROUNDTABLE_{suffix}") or os.environ.get(
            f"FABLEDSCRYER_{suffix}"
        )

    cfg_path = _env("CONFIG") or "config.yaml"
    try:
        with open(cfg_path) as f:
            cfg = yaml.safe_load(f) or {}
        url = cfg.get("database", {}).get("url", "")
    except FileNotFoundError:
        url = ""
    return _env("DATABASE_URL") or _env("DATABASE__URL") or url


def _resolved_url() -> str:
    """Return URL from migration_runner config if set, else fall back to get_url()."""
    return config.get_main_option("sqlalchemy.url") or get_url()


def run_migrations_offline() -> None:
    context.configure(
        url=_resolved_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:
    context.configure(connection=connection, target_metadata=target_metadata)
    with context.begin_transaction():
        context.run_migrations()


async def run_async_migrations() -> None:
    cfg = config.get_section(config.config_ini_section, {})
    cfg["sqlalchemy.url"] = _resolved_url()
    connectable = async_engine_from_config(cfg, prefix="sqlalchemy.", poolclass=pool.NullPool)
    async with connectable.connect() as connection:
        await connection.run_sync(do_run_migrations)
    await connectable.dispose()


def run_migrations_online() -> None:
    asyncio.run(run_async_migrations())


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