"""Dependency-free resolver for known Depth Anything 3 package layouts."""

from __future__ import annotations

import importlib


def resolve_da3_class(importer=importlib.import_module):
    """Return ``(DepthAnything3, module_name)`` or a useful ImportError."""
    errors = []
    for location in ("depth_anything_3.api", "depth_anything_3"):
        try:
            module = importer(location)
            candidate = getattr(module, "DepthAnything3", None)
            if candidate is not None:
                return candidate, location
            errors.append(f"{location}: DepthAnything3 is missing")
        except (ImportError, ModuleNotFoundError, AttributeError) as exc:
            errors.append(f"{location}: {type(exc).__name__}: {exc}")
    raise ImportError("; ".join(errors))