"""Alembic environment configuration.

The migration runner is sync; the runtime service is async. To support a
single configured ``ARTIFACTSTORE_DATABASE_URL``, this module rewrites
async driver URLs (``+aiosqlite``, ``+asyncpg``) to their sync counterparts
when invoking Alembic.
"""

from __future__ import annotations

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

from alembic import context
from sqlalchemy import engine_from_config, pool

_ROOT = Path(__file__).resolve().parent.parent
_SRC = _ROOT / "src"
if str(_SRC) not in sys.path:
    sys.path.insert(0, str(_SRC))

from artifactstore.config import get_settings  # noqa: E402
from artifactstore.db.schema import metadata as target_metadata  # noqa: E402

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


def _sync_url(url: str) -> str:
    """Translate an async driver URL to its sync counterpart for Alembic."""
    if "+aiosqlite" in url:
        return url.replace("+aiosqlite", "")
    if "+asyncpg" in url:
        return url.replace("+asyncpg", "+psycopg")
    return url


_settings = get_settings()
config.set_main_option("sqlalchemy.url", _sync_url(_settings.database_url))


def run_migrations_offline() -> None:
    """Emit SQL without a live DB connection."""
    context.configure(
        url=config.get_main_option("sqlalchemy.url"),
        target_metadata=target_metadata,
        literal_binds=True,
        dialect_opts={"paramstyle": "named"},
    )
    with context.begin_transaction():
        context.run_migrations()


def run_migrations_online() -> None:
    """Run migrations against a live DB connection."""
    section = config.get_section(config.config_ini_section) or {}
    connectable = engine_from_config(
        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()