// 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.

#include <paddle/phi/backends/xpu/xpu_context.h>
#include "paddle/extension.h"
#include "paddle/phi/core/enforce.h"
#include "xpu/plugin.h"

void UpdateInputes(const paddle::Tensor &stop_flags,
                   const paddle::Tensor &not_need_stop,  // cpu
                   const paddle::Tensor &seq_lens_this_time,
                   const paddle::Tensor &seq_lens_encoder,
                   const paddle::Tensor &seq_lens_decoder,
                   const paddle::Tensor &input_ids,
                   const paddle::Tensor &stop_nums,
                   const paddle::Tensor &next_tokens,
                   const paddle::Tensor &is_block_step) {
    phi::XPUPlace place(phi::backends::xpu::GetXPUCurrentDeviceId());
    auto dev_ctx =
        paddle::experimental::DeviceContextPool::Instance().Get(place);
    auto xpu_ctx = static_cast<const phi::XPUContext *>(dev_ctx);

    const int max_bsz = stop_flags.shape()[0];
    PADDLE_ENFORCE_LE(
        max_bsz,
        1024,
        phi::errors::InvalidArgument(
            "Only support max_bs <= 1024, but received max_bs is %d", max_bsz));
    const int now_bsz = seq_lens_this_time.shape()[0];
    const int input_ids_stride = input_ids.shape()[1];
    auto not_need_stop_xpu = not_need_stop.copy_to(stop_flags.place(), false);

    int r = baidu::xpu::api::plugin::update_inputs(
        xpu_ctx->x_context(),
        const_cast<bool *>(not_need_stop_xpu.data<bool>()),
        const_cast<int *>(seq_lens_this_time.data<int>()),
        const_cast<int *>(seq_lens_encoder.data<int>()),
        const_cast<int *>(seq_lens_decoder.data<int>()),
        const_cast<int64_t *>(input_ids.data<int64_t>()),
        stop_nums.data<int64_t>(),
        stop_flags.data<bool>(),
        is_block_step.data<bool>(),
        next_tokens.data<int64_t>(),
        now_bsz,
        max_bsz,
        input_ids_stride);
    PD_CHECK(r == 0, "baidu::xpu::api::plugin::update_inputs failed.");
    auto not_need_stop_cpu =
        not_need_stop_xpu.copy_to(not_need_stop.place(), false);
    bool *not_need_stop_data = const_cast<bool *>(not_need_stop.data<bool>());
    not_need_stop_data[0] = not_need_stop_cpu.data<bool>()[0];
}

PD_BUILD_OP(update_inputs)
    .Inputs({"stop_flags",
             "not_need_stop",
             "seq_lens_this_time",
             "seq_lens_encoder",
             "seq_lens_decoder",
             "input_ids",
             "stop_nums",
             "next_tokens",
             "is_block_step"})
    .Outputs({"not_need_stop_out",
              "seq_lens_this_time_out",
              "seq_lens_encoder_out",
              "seq_lens_decoder_out",
              "input_ids_out"})
    .SetInplaceMap({{"not_need_stop", "not_need_stop_out"},
                    {"seq_lens_this_time", "seq_lens_this_time_out"},
                    {"seq_lens_encoder", "seq_lens_encoder_out"},
                    {"seq_lens_decoder", "seq_lens_decoder_out"},
                    {"input_ids", "input_ids_out"}})
    .SetKernelFn(PD_KERNEL(UpdateInputes));
