/**
 * This file is part of the OpenBOAT project at Harbin Institute of Technology (HIT)
 * and is contributed to the CANN Open Software.
 *
 * Copyright (c) 2025 AISS Group, Harbin Institute of Technology (HIT).
 * All Rights Reserved.
 *
 * Authors (accounts):
 * - Zhou Jianhua<@LePenseur>
 * - Su Tonghua <@sutonghua>
 *
 * This program is free software: you can redistribute it and/or modify it.
 * Licensed under the CANN Open Software License Agreement Version 2.0 (the "License").
 * You may not use this file except in compliance with the License.
 * See the LICENSE file at the root of the repository for the full text of the License.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTIES OF ANY KIND, EXPRESS OR IMPLIED,
 * INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT, MERCHANTABILITY, OR FITNESS FOR A PARTICULAR PURPOSE.
 */

/*!
 * \file axpy_v3_tiling.cpp
 * \brief
 */

#include "log/log.h"
#include "util/math_util.h"
#include "register/op_impl_registry.h"
#include <graph/utils/type_utils.h>
#include "tiling/platform/platform_ascendc.h"
#include "../op_kernel/axpy_v3_tiling_data.h"
#include "../op_kernel/axpy_v3_tiling_key.h"

namespace optiling {

const uint32_t BLOCK_SIZE = 32;
const uint32_t BUFFER_NUM = 2;
const uint32_t WS_SYS_SIZE = 512U;

struct AxpyV3CompileInfo {};

// 获取平台信息如ubSize, coreNum
static ge::graphStatus GetPlatformInfo(gert::TilingContext* context, uint64_t& ubSize, int64_t& coreNum)
{
    // 获取ubsize coreNum
    fe::PlatFormInfos* platformInfoPtr = context->GetPlatformInfo();
    OP_CHECK_NULL_WITH_CONTEXT(context, platformInfoPtr);
    auto ascendcPlatform = platform_ascendc::PlatformAscendC(platformInfoPtr);
    coreNum = ascendcPlatform.GetCoreNumAiv();
    OP_CHECK_IF(coreNum == 0, OP_LOGE(context, "coreNum is 0"), return ge::GRAPH_FAILED);
    ascendcPlatform.GetCoreMemSize(platform_ascendc::CoreMemType::UB, ubSize);
    OP_CHECK_IF(ubSize == 0, OP_LOGE(context, "ubSize is 0"), return ge::GRAPH_FAILED);
    return ge::GRAPH_SUCCESS;
}

// 获取属性，shape信息
static ge::graphStatus GetShapeAttrsInfo(gert::TilingContext* context, int64_t& totalIdx, ge::DataType& dataType)
{
    // 获取输入shape信息
    auto inputX = context->GetInputShape(0);
    OP_CHECK_NULL_WITH_CONTEXT(context, inputX);
    totalIdx = inputX->GetStorageShape().GetShapeSize();
    // dtype校验
    const std::set<ge::DataType> supportedDtype = {ge::DT_FLOAT,ge::DT_FLOAT16};
    auto inputDesc = context->GetInputDesc(0);
    OP_CHECK_NULL_WITH_CONTEXT(context, inputDesc);
    dataType = inputDesc->GetDataType();
    if (supportedDtype.count(dataType) == 0) {
        OP_LOGE(context, "invalid dtype");
        return ge::GRAPH_FAILED;
    }
    return ge::GRAPH_SUCCESS;
}

static ge::graphStatus GetWorkspaceSize(gert::TilingContext* context)
{
    auto ascendcPlatform = platform_ascendc:: PlatformAscendC(context->GetPlatformInfo());
    uint32_t sysWorkspaceSize = ascendcPlatform.GetLibApiWorkSpaceSize();
    size_t* currentWorkspace = context->GetWorkspaceSizes(1);
    OP_CHECK_NULL_WITH_CONTEXT(context, currentWorkspace);
    currentWorkspace[0] = WS_SYS_SIZE + sysWorkspaceSize;
    return ge::GRAPH_SUCCESS;
}

// tiling 分发入口
static ge::graphStatus AxpyV3TilingFunc(gert::TilingContext* context)
{
    // 1. platform
    uint64_t ubSize = 0;
    int64_t coreNum = 0;
    OP_CHECK_IF(GetPlatformInfo(context, ubSize, coreNum) != ge::GRAPH_SUCCESS,
                OP_LOGE(context, "GetPlatformInfo error"), return ge::GRAPH_FAILED);

    // 2. shapes & dtype
    int64_t totalIdx = 0;
    ge::DataType dataType;
    OP_CHECK_IF(GetShapeAttrsInfo(context, totalIdx, dataType) != ge::GRAPH_SUCCESS,
                OP_LOGE(context, "GetShapeAttrsInfo error"), return ge::GRAPH_FAILED);

    // 3. workspace
    OP_CHECK_IF(GetWorkspaceSize(context) != ge::GRAPH_SUCCESS,
                OP_LOGE(context, "GetWorkspaceSize error"), return ge::GRAPH_FAILED);

    AxpyV3TilingData* tiling = context->GetTilingData<AxpyV3TilingData>();
    OP_CHECK_NULL_WITH_CONTEXT(context, tiling);
    OP_CHECK_IF(memset_s(tiling, sizeof(AxpyV3TilingData), 0, sizeof(AxpyV3TilingData)) != EOK,
                OP_LOGE(context, "set tiling data error"), return ge::GRAPH_FAILED);

    auto attrs = context->GetAttrs();
    float a = 1.0f; 
    if (attrs) {
        const float* attrA = attrs->GetFloat(0); 
        if (attrA != nullptr) {
            a = *attrA;
        }
    }
    OP_LOGI(context, "AxpyV3 tiling: attr a final value = %f", a);

    uint32_t typeLength = 0;
    ge::TypeUtils::GetDataTypeLength(context->GetInputDesc(0)->GetDataType(), typeLength);
    if (typeLength == 0) {
        OP_LOGE(context, "typeLength is 0");
        return ge::GRAPH_FAILED;
    }
    uint64_t inputBytes = static_cast<uint64_t>(typeLength);
    uint64_t inputLengthBytes = static_cast<uint64_t>(totalIdx) * inputBytes;

    // ub-based tileBlockNum guard (避免为0)
    uint32_t ubDataNumber = (inputBytes == 1ULL) ? 5U : 3U;
    uint64_t tmp = (ubSize / BLOCK_SIZE / BUFFER_NUM);
    uint32_t tileBlockNum = 1U;
    if (tmp > 0) {
        uint64_t tb = tmp / ubDataNumber;
        tileBlockNum = (tb == 0) ? 1U : static_cast<uint32_t>(tb);
    }

    // 每个 tile 包含的元素数（至少 1）
    uint32_t tileDataNum = static_cast<uint32_t>((static_cast<uint64_t>(tileBlockNum) * BLOCK_SIZE) / inputBytes);
    if (tileDataNum == 0U) tileDataNum = 1U;

    // 总 block 数（向上取整）
    uint64_t blocksTotal = (inputLengthBytes + BLOCK_SIZE - 1ULL) / BLOCK_SIZE;
    uint64_t coreNum64 = static_cast<uint64_t>(coreNum);
    if (coreNum64 > blocksTotal) coreNum64 = blocksTotal;
    if (coreNum64 == 0ULL) coreNum64 = 1ULL; // 最少 1 core
    uint32_t finalCoreNum = static_cast<uint32_t>(coreNum64);

    uint64_t everyCoreInputBlockNum = blocksTotal / coreNum64; // 基本块数
    uint32_t tailBlockNum = static_cast<uint32_t>(blocksTotal % coreNum64); // 前 tailBlockNum 个核是 big-core

    // small-core 数量（元素）
    uint64_t smallCoreDataNum_u = everyCoreInputBlockNum * BLOCK_SIZE / inputBytes;
    uint32_t smallCoreDataNum = static_cast<uint32_t>(smallCoreDataNum_u);

    uint32_t smallTileNum = static_cast<uint32_t>(everyCoreInputBlockNum / static_cast<uint64_t>(tileBlockNum));
    uint32_t finalSmallTileNum = ((everyCoreInputBlockNum % tileBlockNum) == 0) ? smallTileNum : (smallTileNum + 1);
    int64_t smallTailDataNum_i = static_cast<int64_t>(smallCoreDataNum) - static_cast<int64_t>(tileDataNum) * static_cast<int64_t>(smallTileNum);
    uint32_t smallTailDataNum = (smallTailDataNum_i <= 0) ? tileDataNum : static_cast<uint32_t>(smallTailDataNum_i);

    // big-core（每个多一个 block）
    uint64_t bigEveryCoreBlockNum = everyCoreInputBlockNum + 1ULL;
    uint64_t bigCoreDataNum_u = bigEveryCoreBlockNum * BLOCK_SIZE / inputBytes;
    uint32_t bigCoreDataNum = static_cast<uint32_t>(bigCoreDataNum_u);
    uint32_t bigTileNum = static_cast<uint32_t>(bigEveryCoreBlockNum / static_cast<uint64_t>(tileBlockNum));
    uint32_t finalBigTileNum = ((bigEveryCoreBlockNum % tileBlockNum) == 0) ? bigTileNum : (bigTileNum + 1);
    int64_t bigTailDataNum_i = static_cast<int64_t>(bigCoreDataNum) - static_cast<int64_t>(tileDataNum) * static_cast<int64_t>(bigTileNum);
    uint32_t bigTailDataNum = (bigTailDataNum_i <= 0) ? tileDataNum : static_cast<uint32_t>(bigTailDataNum_i);

    // write back
    tiling->smallCoreDataNum = static_cast<int64_t>(smallCoreDataNum);
    tiling->bigCoreDataNum = static_cast<int64_t>(bigCoreDataNum);
    tiling->tileDataNum = static_cast<int64_t>(tileDataNum);
    tiling->smallTailDataNum = static_cast<int64_t>(smallTailDataNum);
    tiling->bigTailDataNum = static_cast<int64_t>(bigTailDataNum);
    tiling->finalSmallTileNum = static_cast<int64_t>(finalSmallTileNum);
    tiling->finalBigTileNum = static_cast<int64_t>(finalBigTileNum);
    tiling->tailBlockNum = static_cast<int64_t>(tailBlockNum);
    tiling->a = a;

    context->SetBlockDim(finalCoreNum);
    return ge::GRAPH_SUCCESS;
}


static ge::graphStatus TilingParseForAxpyV3([[maybe_unused]] gert::TilingParseContext* context)
{
    return ge::GRAPH_SUCCESS;
}

// tiling注册入口.
IMPL_OP_OPTILING(AxpyV3).Tiling(AxpyV3TilingFunc).TilingParse<AxpyV3CompileInfo>(TilingParseForAxpyV3);
} // namespace optiling