"""Headless-macOS import shims for the HSMR engine (our fleet is all Apple Silicon).

pyrender -> PyOpenGL -> EGL cannot load without a GL context, yet several vendored modules
`import pyrender` at load time — some even in type annotations (`List[pyrender.Node]`) — so
the import chain explodes before any of our code runs. We never render in-process; Blender
is the fleet renderer (Lane C). So we drop permissive fakes for the pyrender + OpenGL stack
into sys.modules, letting the chain import while keeping everything else (ColorPalette,
Wis3D, the models) real.

Import this BEFORE the first `lib.*` import:  `import _headless  # noqa: F401`

# ponytail: fakes, not a real headless GL backend (osmesa/egl). We don't render here, so a
# working GL context would be dead weight. Wire a real one only if in-process render is ever
# needed off-fleet.
"""
import sys
import types


class _Any:
    def __call__(self, *a, **k): return self
    def __getattr__(self, n): return self


class _AnyModule(types.ModuleType):
    def __getattr__(self, n):
        if n.startswith('__') and n.endswith('__'):
            raise AttributeError(n)
        return _Any()


# setdefault: never clobber a real module that a caller already imported on purpose.
for _n in ('pyrender', 'OpenGL', 'OpenGL.GL', 'OpenGL.error', 'OpenGL.platform'):
    sys.modules.setdefault(_n, _AnyModule(_n))