"""
# Copyright (c) 2025  PaddlePaddle Authors. All Rights Reserved.
#
# 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.
"""

import paddle

from fastdeploy.config import FDConfig
from fastdeploy.model_executor.ops.gpu import ngram_match

from .base import Proposer


class NgramProposer(Proposer):
    """
    Proposer for Ngram match method.

    Matching corresponding tokens in input and output as draft tokens.
    """

    def __init__(self, cfg: FDConfig):
        super().__init__(cfg)
        self.max_ngram_size = self.speculative_config.max_ngram_size
        self.input_ids_len = paddle.zeros(shape=[self.max_num_seqs, 1], dtype="int64").cpu()

    def update(self, bid: int, seq_len: int):
        """
        update
        """
        self.input_ids_len[bid] = seq_len

    def _run_impl(self, share_inputs):
        """
        run
        """
        draft_tokens = share_inputs["draft_tokens"].cpu()
        seq_lens_this_time = share_inputs["seq_lens_this_time"].cpu()
        seq_lens_encoder = share_inputs["seq_lens_encoder"].cpu()
        seq_lens_decoder = share_inputs["seq_lens_decoder"].cpu()

        ngram_match(
            share_inputs["input_ids_cpu"],
            self.input_ids_len.cpu(),
            share_inputs["pre_ids"].cpu(),
            share_inputs["step_idx"].cpu(),
            share_inputs["actual_draft_token_num"].cpu(),
            draft_tokens,
            seq_lens_this_time,
            seq_lens_encoder,
            seq_lens_decoder,
            share_inputs["max_dec_len"].cpu(),
            self.max_ngram_size,
            self.max_draft_token_num,
        )
        share_inputs["draft_tokens"][:] = draft_tokens.cuda()
        share_inputs["seq_lens_encoder"][:] = seq_lens_encoder.cuda()
        share_inputs["seq_lens_this_time"][:] = seq_lens_this_time.cuda()