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# SPDX-License-Identifier: Apache-2.0
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# Licensed under the Apache License, Version 2.0 (the "License");
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# http://www.apache.org/licenses/LICENSE-2.0
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"""ModelOpt plugin for enabling automatic save/restore of ModelOpt state for `diffusers` library."""

import types

from diffusers import ModelMixin

from .huggingface import _new_save_pretrained, _patch_model_init_for_modelopt, register_for_patching

__all__ = []


def _new_from_pretrained(cls, /, pretrained_model_name_or_path, *args, **kwargs):
    """Patch for `cls.from_pretrained` method to restore ModelOpt state."""
    with _patch_model_init_for_modelopt(cls, pretrained_model_name_or_path):
        model = types.MethodType(cls._modelopt_cache["from_pretrained"].__func__, cls)(
            pretrained_model_name_or_path, *args, **kwargs
        )
    return model


modelmixin_patch_methods = [
    ("from_pretrained", classmethod(_new_from_pretrained)),
    ("save_pretrained", _new_save_pretrained),
]
register_for_patching("diffusers", ModelMixin, modelmixin_patch_methods)