# SPDX-License-Identifier: Apache-2.0
# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
from typing import TYPE_CHECKING

from vllm.platforms.interface import Platform, PlatformEnum

if TYPE_CHECKING:
    from vllm.config import VllmConfig
else:
    VllmConfig = None
from vllm import envs


class DummyPlatform(Platform):
    _enum = PlatformEnum.OOT
    device_name = "DummyDevice"
    device_type: str = "privateuseone"
    dispatch_key: str = "PrivateUse1"

    @classmethod
    def check_and_update_config(cls, vllm_config: VllmConfig) -> None:
        if envs.VLLM_USE_V1:
            compilation_config = vllm_config.compilation_config
            # Activate custom ops for v1.
            compilation_config.custom_ops = ["all"]

    def get_attn_backend_cls(self, backend_name, head_size, dtype,
                             kv_cache_dtype, block_size, use_v1, use_mla,
                             has_sink, use_sparse):
        return "vllm_add_dummy_platform.dummy_attention_backend.DummyAttentionBackend"  # noqa E501
