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#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
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#
#     http://www.apache.org/licenses/LICENSE-2.0
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from transformers.modeling_utils import ALL_ATTENTION_FUNCTIONS

from ..utils.py_functional import is_transformers_version_greater_than
from .transformers.flash_attention_utils import flash_attention_forward


SUPPORTED_MODEL_TYPE = (
    "llama",
    "gemma",
    "gemma2",
    "mistral",
    "qwen2",
    "qwen2_moe",
    "qwen3",
    "qwen3_moe",
    "qwen2_vl",
    "qwen2_5_vl",
    "qwen3_vl",
    "qwen3_vl_moe",
)

QWEN2_VL_MODELS = ("qwen2_vl", "qwen2_5_vl")
QWEN3_VL_MODELS = ("qwen3_vl", "qwen3_vl_moe")


def apply_ulysses_patch(model_type: str) -> None:
    if not is_transformers_version_greater_than("4.54.0"):
        raise RuntimeError("Only support transformers >= 4.54.0.")


    if model_type in SUPPORTED_MODEL_TYPE:
        ALL_ATTENTION_FUNCTIONS["flash_attention_2"] = flash_attention_forward
    else:
        #model_type = "qwen2_5_vl"
        raise NotImplementedError(f"Model architecture {model_type} is not supported yet.")

    if model_type in QWEN2_VL_MODELS:
        from transformers.models.qwen2_5_vl.modeling_qwen2_5_vl import (
            Qwen2_5_VLForConditionalGeneration,
            Qwen2_5_VLModel,
        )
        from transformers.models.qwen2_vl.modeling_qwen2_vl import Qwen2VLForConditionalGeneration, Qwen2VLModel

        from .transformers.qwen2_vl import qwen2_vl_base_forward, qwen2_vl_model_forward

        # fix text-image mixed data
        Qwen2VLModel.forward = qwen2_vl_base_forward
        Qwen2_5_VLModel.forward = qwen2_vl_base_forward
        # TODO: add linear cross entropy kernels
        Qwen2VLForConditionalGeneration.forward = qwen2_vl_model_forward
        Qwen2_5_VLForConditionalGeneration.forward = qwen2_vl_model_forward
    elif model_type in QWEN3_VL_MODELS:
        from transformers.models.qwen3_vl.modeling_qwen3_vl import Qwen3VLForConditionalGeneration, Qwen3VLModel
        from transformers.models.qwen3_vl_moe.modeling_qwen3_vl_moe import (
            Qwen3VLMoeForConditionalGeneration,
            Qwen3VLMoeModel,
        )

        from .transformers.qwen3_vl import qwen3_vl_base_forward, qwen3_vl_model_forward

        # fix text-image mixed data
        Qwen3VLModel.forward = qwen3_vl_base_forward
        Qwen3VLMoeModel.forward = qwen3_vl_base_forward
        # TODO: add linear cross entropy kernels
        Qwen3VLForConditionalGeneration.forward = qwen3_vl_model_forward
        Qwen3VLMoeForConditionalGeneration.forward = qwen3_vl_model_forward