"""Composition root: build the runtime registry from settings.

The HTTP server, the CLI, and any future host all instantiate the
:class:`Registry` through :func:`build_registry`. Wiring lives here so the
control-plane consumers stay thin (per ADR-0004).
"""

from __future__ import annotations

from artifactstore.config import Settings, get_settings
from artifactstore.dataplane import InProcessDataPlane
from artifactstore.db.engine import create_engine
from artifactstore.events import RegistryViewWriter
from artifactstore.registry import Registry
from artifactstore.retention import RetentionPolicy
from artifactstore.storage import LocalBackend

__all__ = ["build_registry"]


def build_registry(settings: Settings | None = None) -> Registry:
    """Wire engine, local FS backend, in-process data plane, and registry."""
    effective = settings or get_settings()
    engine = create_engine(effective)
    backend = LocalBackend(effective.storage_local_root, backend_id="local")
    dataplane = InProcessDataPlane(backend)
    view_writer = RegistryViewWriter()
    retention_policy = RetentionPolicy.from_toml(effective.retention_config_path)
    return Registry(engine, dataplane, view_writer, retention_policy)