/**
 * 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):
 * - Liang Yanglin <@liang-yanglin>
 * - 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 cast_v2_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/cast_v2_tiling_data.h"
#include "../op_kernel/cast_v2_tiling_key.h"

namespace optiling {
    constexpr uint32_t BLOCK_SIZE = 32;
    constexpr uint32_t BUFFER_NUM = 2;
    constexpr uint32_t WS_SYS_SIZE = 0;

struct CastV2CompileInfo {};

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)
{
    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_INT32, ge::DT_INT64,         
                ge::DT_FLOAT16, ge::DT_INT16, ge::DT_BF16,ge::DT_INT8, ge::DT_UINT8};
    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 CastV2TilingFunc(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);

    CastV2TilingData* tiling = context->GetTilingData<CastV2TilingData>();
    OP_CHECK_NULL_WITH_CONTEXT(context, tiling);
    OP_CHECK_IF(memset_s(tiling, sizeof(CastV2TilingData), 0, sizeof(CastV2TilingData)) != EOK,
                OP_LOGE(context, "set tiling data error"), return ge::GRAPH_FAILED);

    // --- safer numeric types ---
    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 = 0;
    uint32_t XtypeLength = 0;
    uint32_t ZtypeLength = 0;
    ge::TypeUtils::GetDataTypeLength(context->GetInputDesc(0)->GetDataType(), XtypeLength);
    ge::TypeUtils::GetDataTypeLength(context->GetOutputDesc(0)->GetDataType(), ZtypeLength);
    //此处，ubDataNumber根据输入输出的数据类型字长确定，例如：x为int16，z为half，则ubDataNumber = 1 + sizeof(z)/sizeof(x) = 2,如果不能整除，则额外加1
    if(ZtypeLength%XtypeLength==0){
        ubDataNumber = 1 + ZtypeLength/XtypeLength;
    }
    else{
        ubDataNumber = 1 + ZtypeLength/XtypeLength + 1;
    }

    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;
    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）
    uint32_t smallCoreDataNum = static_cast<uint32_t>(everyCoreInputBlockNum * BLOCK_SIZE / inputBytes);
    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;
    uint32_t bigCoreDataNum = static_cast<uint32_t>(bigEveryCoreBlockNum * BLOCK_SIZE / inputBytes);
    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);
    context->SetBlockDim(finalCoreNum);
    return ge::GRAPH_SUCCESS;
}

static ge::graphStatus TilingParseForCastV2([[maybe_unused]] gert::TilingParseContext* context)
{   
    return ge::GRAPH_SUCCESS;
}

// tiling注册入口.
IMPL_OP_OPTILING(CastV2).Tiling(CastV2TilingFunc).TilingParse<CastV2CompileInfo>(TilingParseForCastV2);
} // namespace optiling