# SPDX-License-Identifier: Apache-2.0
# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
'''
Worker-related helper functions.
'''

from vllm.utils import STR_NOT_IMPL_ENC_DEC_ERR_STRS
from vllm.worker.model_runner import GPUModelRunnerBase


def assert_enc_dec_mr_supported_scenario(
        enc_dec_mr: GPUModelRunnerBase) -> None:
    '''
    Asserted that the provided encoder/decoder model runner instance reflects
    a supported scenario.
    '''

    # Reminder: Please update docs/features/compatibility_matrix.md
    # If the feature combo become valid

    if enc_dec_mr.cache_config.enable_prefix_caching:
        raise NotImplementedError(
            STR_NOT_IMPL_ENC_DEC_ERR_STRS['STR_NOT_IMPL_ENC_DEC_PREFIX_CACHE'])

    if enc_dec_mr.sliding_window is not None:
        raise NotImplementedError(
            STR_NOT_IMPL_ENC_DEC_ERR_STRS['STR_NOT_IMPL_ENC_DEC_SWA'])

    if enc_dec_mr.scheduler_config.chunked_prefill_enabled:
        raise NotImplementedError(STR_NOT_IMPL_ENC_DEC_ERR_STRS[
            'STR_NOT_IMPL_ENC_DEC_CHUNKED_PREFILL'])

    if getattr(enc_dec_mr.model_config.hf_config, 'attn_logit_softcapping',
               None) is not None:
        raise NotImplementedError(
            STR_NOT_IMPL_ENC_DEC_ERR_STRS['STR_NOT_IMPL_ENC_DEC_LOGIT_SOFTCAP']
        )

    if enc_dec_mr.lora_config is not None:
        raise NotImplementedError(
            STR_NOT_IMPL_ENC_DEC_ERR_STRS['STR_NOT_IMPL_ENC_DEC_LORA'])

    if enc_dec_mr.parallel_config.pipeline_parallel_size > 1:
        raise NotImplementedError(
            STR_NOT_IMPL_ENC_DEC_ERR_STRS['STR_NOT_IMPL_ENC_DEC_PP'])

    if enc_dec_mr.scheduler_config.num_lookahead_slots > 0:
        raise NotImplementedError(
            STR_NOT_IMPL_ENC_DEC_ERR_STRS['STR_NOT_IMPL_ENC_DEC_SPEC_DEC'])
