/**
 * Copyright (c) 2026 Huawei Technologies Co., Ltd.
 * This program is free software, you can redistribute it and/or modify it under the terms and conditions of
 * CANN Open Software License Agreement Version 2.0 (the "License").
 * Please refer to the License for details. You may not use this file except in compliance with the License.
 * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND, EITHER EXPRESS OR IMPLIED,
 * INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT, MERCHANTABILITY, OR FITNESS FOR A PARTICULAR PURPOSE.
 * See LICENSE in the root of the software repository for the full text of the License.
 */

/*!
 * \file reciprocal_tiling.cpp
 * \brief
 */

#include "log/log.h"
#include "util/math_util.h"
#include <graph/utils/type_utils.h>
#include "tiling/platform/platform_ascendc.h"
#include "register/op_impl_registry.h"
#include "../op_kernel/reciprocal_tiling_data.h"
#include "../op_kernel/reciprocal_tiling_key.h"

namespace optiling {

struct ReciprocalCompileInfo {};

const uint64_t BLOCK_SIZE = 32;
const uint64_t BUFFER_NUM = 2;

// tiling 分发入口
static ge::graphStatus ReciprocalTilingFunc(gert::TilingContext* context)
{
    ReciprocalTilingData* tiling = context->GetTilingData<ReciprocalTilingData>();
    uint64_t ubLength = 0;
    uint64_t bigCoreDataNum = 0;
    uint64_t bigCoreLoopNum = 0;
    uint64_t bigCoreTailDataNum = 0;
    
    auto ascendcPlatform = platform_ascendc::PlatformAscendC(context->GetPlatformInfo());
    ascendcPlatform.GetCoreMemSize(platform_ascendc::CoreMemType::UB, ubLength);
    auto coreNum = ascendcPlatform.GetCoreNum();
    
    uint64_t inputDataNum = context->GetInputShape(0)->GetStorageShape().GetShapeSize();
    uint32_t dataTypeLength = 0;
    ge::TypeUtils::GetDataTypeLength(context->GetInputDesc(0)->GetDataType(), dataTypeLength);
    uint64_t inputLength = inputDataNum * dataTypeLength;
    auto dt = context->GetInputTensor(0)->GetDataType();
    uint64_t ubPartNum = (dt == ge:: DT_BF16 ) ? 4 : 2;
    uint64_t ubPartLength = ubLength / ubPartNum / BUFFER_NUM;
    uint64_t ubPartBlockNum = ubPartLength / BLOCK_SIZE;
    uint64_t ubPartDataNum = (ubPartBlockNum * BLOCK_SIZE) / dataTypeLength;

    uint64_t inputLengthAlign32 = (((inputLength + BLOCK_SIZE - 1) / BLOCK_SIZE) * BLOCK_SIZE);
    
    if(ubPartDataNum >= inputDataNum)
    {
        coreNum=1;
    }
    else
    {
        coreNum = (coreNum <  inputLengthAlign32 / BLOCK_SIZE) ? coreNum : inputLengthAlign32 / BLOCK_SIZE;
    }
    if(BLOCK_SIZE == 0 || coreNum == 0){
		return ge::GRAPH_FAILED;
    }
    uint64_t everyCoreInputBlockNum = inputLengthAlign32 / BLOCK_SIZE / coreNum;
    uint64_t tailBlockNum = (inputLengthAlign32 / BLOCK_SIZE) % coreNum;
    uint64_t smallCoreDataNum = everyCoreInputBlockNum * BLOCK_SIZE / dataTypeLength;
    uint64_t smallCoreLoopNum = smallCoreDataNum / ubPartDataNum;
    smallCoreLoopNum = (everyCoreInputBlockNum % ubPartBlockNum) == 0 ? smallCoreLoopNum : smallCoreLoopNum + 1;
    uint64_t smallCoreTailDataNum = smallCoreDataNum - ubPartDataNum * (smallCoreLoopNum-1);
    smallCoreTailDataNum = smallCoreTailDataNum == 0 ? ubPartDataNum : smallCoreTailDataNum;

    if(0 != tailBlockNum)
    {
        everyCoreInputBlockNum += 1;
        bigCoreDataNum = everyCoreInputBlockNum * BLOCK_SIZE / dataTypeLength;
        bigCoreLoopNum = bigCoreDataNum / ubPartDataNum;
        bigCoreLoopNum = (everyCoreInputBlockNum % ubPartBlockNum) == 0 ? bigCoreLoopNum : bigCoreLoopNum + 1;
        bigCoreTailDataNum = bigCoreDataNum - ubPartDataNum * (bigCoreLoopNum-1);
        bigCoreTailDataNum = bigCoreTailDataNum == 0 ? ubPartDataNum : bigCoreTailDataNum;
        context->SetTilingKey(1);
    }
    else
    {
        context->SetTilingKey(0);
    }
    
    tiling->smallCoreDataNum = smallCoreDataNum;
    tiling->bigCoreDataNum = bigCoreDataNum;
    tiling->ubPartDataNum = ubPartDataNum;
    tiling->smallCoreTailDataNum = smallCoreTailDataNum;
    tiling->bigCoreTailDataNum = bigCoreTailDataNum;
    tiling->smallCoreLoopNum = smallCoreLoopNum;
    tiling->bigCoreLoopNum = bigCoreLoopNum;
    tiling->tailBlockNum = tailBlockNum;
    context->SetBlockDim(coreNum);

    size_t *currentWorkspace = context->GetWorkspaceSizes(1);
    currentWorkspace[0] = 0;
    return ge::GRAPH_SUCCESS;
}

static ge::graphStatus TilingParseForReciprocal([[maybe_unused]] gert::TilingParseContext* context)
{
    return ge::GRAPH_SUCCESS;
}

// tiling注册入口.
IMPL_OP_OPTILING(Reciprocal).Tiling(ReciprocalTilingFunc).TilingParse<ReciprocalCompileInfo>(TilingParseForReciprocal);
} // namespace optiling