#
# Copyright (c) 2025 Huawei Technologies Co., Ltd. All Rights Reserved.
# This file is a part of the vllm-ascend project.
#
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
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from torch import fx as fx
from vllm.config import VllmConfig

from vllm_ascend.ascend_config import get_ascend_config
from vllm_ascend.utils import vllm_version_is

if vllm_version_is("0.15.0"):
    from vllm.compilation.inductor_pass import get_pass_context  # type: ignore
    from vllm.compilation.vllm_inductor_pass import VllmInductorPass  # type: ignore
else:
    from vllm.compilation.passes.inductor_pass import get_pass_context
    from vllm.compilation.passes.vllm_inductor_pass import VllmInductorPass


class NpuGraphEXPassManager:
    """
    A pass manager for npu_graph ex fusion passes.
    It handles the configuration and execution of passes.
    The counterpart in vllm is PostGradPassManager. Since torch_npu
    does not support triton for now, we define our own pass manager.
    """

    def __init__(self):
        self.passes: list[VllmInductorPass] = []

    def __call__(self, graph: fx.Graph) -> fx.Graph:
        compile_range = get_pass_context().compile_range

        for pass_ in self.passes:
            if pass_.is_applicable_for_range(compile_range):
                pass_(graph)
        graph.recompiler()
        return graph

    def add(self, pass_: VllmInductorPass):
        assert isinstance(pass_, VllmInductorPass)
        self.passes.append(pass_)

    def configure(self, config: VllmConfig):
        # By default, we enable the graph fusion and quantization fusion pass.
        self.npugraph_ex_config = get_ascend_config().npugraph_ex_config

        if self.npugraph_ex_config.fuse_norm_quant:
            from .npugraph_ex_passes.graphex_norm_quant_fusion_pass import GraphEXAddRMSNormFusionPass

            self.passes.append(GraphEXAddRMSNormFusionPass(config))

        if self.npugraph_ex_config.fuse_qknorm_rope:
            from .npugraph_ex_passes.graphex_qknorm_rope_fusion_pass import GraphEXQKNormRopeFusionPass

            self.passes.append(GraphEXQKNormRopeFusionPass(config))

        if self.npugraph_ex_config.fuse_allreduce_rms:
            from .npugraph_ex_passes.graphex_allreduce_rmsnorm_fusion_pass import GraphEXMatmulAllReduceAddRMSNormPass

            self.passes.append(GraphEXMatmulAllReduceAddRMSNormPass(config))