"""# Summary

Composition root — connects MongoDB (when selected), wires all repos and
services, and returns the resources dict. Shared bootstrap for the FastAPI
app, the worker and the seed/drop scripts, guarded against repeated
initialization via a module-level flag.

---

The ``memory`` backend skips the Mongo connection entirely — repos are
process-local dictionaries, so a plain ``uvicorn main:app`` runs with zero
external services.
"""
from typing import Any

from config import settings
from domain.item.ports.db import create_item_repo
from domain.item.ports.service import get_item_service
from domain.job.ports.db import create_job_repo
from domain.job.ports.service import get_job_service
from infra.db.setup import setup_database, shutdown_database

_resources: dict[str, Any] = {}
_initialized: bool = False


async def init() -> dict[str, Any]:
    """Wire all repos and services, and return the resources dict.

    Idempotent: repeated calls short-circuit and return the cached resources.
    Only the ``mongo`` backend performs a network connection here.

    Returns:
        Dict[str, Any]: Named services keyed by resource name
            (``<resource>_svc`` and ``<resource>_repo``).
    """
    global _resources, _initialized
    if _initialized:
        return _resources

    if settings.repo_backend == "mongo":
        await setup_database(uri=settings.mongo_uri, db_name=settings.mongo_db)

    item_repo = create_item_repo()
    job_repo = create_job_repo()

    _resources["item_repo"] = item_repo
    _resources["job_repo"] = job_repo
    _resources["item_svc"] = get_item_service(item_repo)
    _resources["job_svc"] = get_job_service(job_repo)

    _initialized = True
    return _resources


async def shutdown() -> None:
    """Disconnect MongoDB (if connected) and reset the resources cache."""
    global _initialized
    if settings.repo_backend == "mongo":
        await shutdown_database()
    _resources.clear()
    _initialized = False