from .eagle3 import Eagle3Sampler, Eagle3SpecMetadata
from .mtp import MTPHiddenStatesManager, MTPSampler, MTPSpecMetadata


def get_spec_metadata(spec_config,
                      max_num_requests,
                      spec_resource_manager=None):
    if spec_config.spec_dec_mode.is_mtp():
        return MTPSpecMetadata(
            max_draft_tokens=spec_config.max_draft_tokens,
            spec_dec_mode=spec_config.spec_dec_mode,
            mtp_num_modules=spec_config.num_nextn_predict_layers,
            max_num_requests=max_num_requests,
            mtp_hidden_states_manager=spec_resource_manager)
    elif spec_config.spec_dec_mode.is_eagle3():
        return Eagle3SpecMetadata(max_draft_tokens=spec_config.max_draft_tokens,
                                  spec_dec_mode=spec_config.spec_dec_mode,
                                  max_num_requests=max_num_requests,
                                  num_layers=spec_config.num_layers,
                                  hidden_size=spec_config.hidden_size)
    else:
        return None


def get_spec_resource_manager(spec_config, model_config, max_num_requests):
    if spec_config.spec_dec_mode.is_mtp_eagle():
        if spec_config.use_relaxed_acceptance_for_thinking:
            return MTPHiddenStatesManager(spec_config, model_config.torch_dtype,
                                          model_config.hidden_size,
                                          max_num_requests)
        else:
            return None
    elif spec_config.spec_dec_mode.is_mtp():
        return MTPHiddenStatesManager(spec_config, model_config.torch_dtype,
                                      model_config.hidden_size,
                                      max_num_requests)
    else:
        return None


def get_spec_decoder(max_seq_len, spec_config):
    if spec_config.spec_dec_mode.is_mtp():
        return MTPSampler(max_seq_len, spec_config)
    if spec_config.spec_dec_mode.is_eagle3():
        return Eagle3Sampler(max_seq_len)
    else:
        return None


def get_num_spec_layers(spec_config):
    if spec_config.spec_dec_mode.is_mtp():
        return spec_config.num_nextn_predict_layers
    else:
        return 0