/**

 * Copyright (c) 2025 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.

 */



#include <chrono>

#include <algorithm>

#include <iostream>

#include <vector>

#include "acl/acl.h"

#include "aclnnop/aclnn_split_tensor.h"



#define CHECK_RET(cond, return_expr) \

  do {                               \

    if (!(cond)) {                   \

      return_expr;                   \

    }                                \

  } while (0)



#define LOG_PRINT(message, ...)     \

  do {                              \

    printf(message, ##__VA_ARGS__); \

  } while (0)



int64_t GetShapeSize(const std::vector<int64_t>& shape) {

  int64_t shapeSize = 1;

  for (auto i : shape) {

    shapeSize *= i;

  }

  return shapeSize;

}



int Init(int32_t deviceId, aclrtStream* stream) {

  // 固定写法，资源初始化

  auto ret = aclInit(nullptr);

  CHECK_RET(ret == ACL_SUCCESS, LOG_PRINT("aclInit failed. ERROR: %d\n", ret); return ret);

  ret = aclrtSetDevice(deviceId);

  CHECK_RET(ret == ACL_SUCCESS, LOG_PRINT("aclrtSetDevice failed. ERROR: %d\n", ret); return ret);

  ret = aclrtCreateStream(stream);

  CHECK_RET(ret == ACL_SUCCESS, LOG_PRINT("aclrtCreateStream failed. ERROR: %d\n", ret); return ret);

  return 0;

}



template <typename T>

int CreateAclTensor(const std::vector<T>& hostData, const std::vector<int64_t>& shape, void** deviceAddr,

                    aclDataType dataType, aclTensor** tensor) {

  auto size = GetShapeSize(shape) * sizeof(T);

  // 调用aclrtMalloc申请device侧内存

  auto ret = aclrtMalloc(deviceAddr, size, ACL_MEM_MALLOC_HUGE_FIRST);

  CHECK_RET(ret == ACL_SUCCESS, LOG_PRINT("aclrtMalloc failed. ERROR: %d\n", ret); return ret);

  // 调用aclrtMemcpy将host侧数据拷贝到device侧内存上

  ret = aclrtMemcpy(*deviceAddr, size, hostData.data(), size, ACL_MEMCPY_HOST_TO_DEVICE);

  CHECK_RET(ret == ACL_SUCCESS, LOG_PRINT("aclrtMemcpy failed. ERROR: %d\n", ret); return ret);



  // 计算连续tensor的strides

  std::vector<int64_t> strides(shape.size(), 1);

  for (int64_t i = shape.size() - 2; i >= 0; i--) {

    strides[i] = shape[i + 1] * strides[i + 1];

  }



  // 调用aclCreateTensor接口创建aclTensor

  *tensor = aclCreateTensor(shape.data(), shape.size(), dataType, strides.data(), 0, aclFormat::ACL_FORMAT_ND,

                            shape.data(), shape.size(), *deviceAddr);

  return 0;

}



void CheckResult(const std::vector<std::vector<int64_t>> &shapeList, const std::vector<void *> addrList) {

  for (size_t i = 0; i < shapeList.size(); i++) {

    auto size = GetShapeSize(shapeList[i]);

    std::vector<float> resultData(size, 0);

    auto ret = aclrtMemcpy(resultData.data(), resultData.size() * sizeof(resultData[0]), addrList[i],

                           size * sizeof(resultData[0]), ACL_MEMCPY_DEVICE_TO_HOST);

    CHECK_RET(ret == ACL_SUCCESS, LOG_PRINT("aclrtMemcpy failed. ERROR: %d\n", ret); return);

    for (int64_t j = 0; j < size; j++) {

      LOG_PRINT("result[%ld] is: %f\n", j, resultData[j]);

    }

  }

}



int main() {

  // 1.（固定写法）device/stream初始化，参考acl API手册

  // 根据自己的实际device填写deviceId

  int32_t deviceId = 0;

  aclrtStream stream;

  auto ret = Init(deviceId, &stream);

  CHECK_RET(ret == ACL_SUCCESS, LOG_PRINT("Init acl failed. ERROR: %d\n", ret); return ret);



  // 2. 构造输入与输出，需要根据API的接口自定义构造

  std::vector<int64_t> selfShape = {4, 2};

  std::vector<int64_t> shape1 = {2, 2};

  std::vector<int64_t> shape2 = {2, 2};

  uint64_t splitSections = 2;

  int64_t dim = 0;



  void* selfDeviceAddr = nullptr;

  void* shape1DeviceAddr = nullptr;

  void* shape2DeviceAddr = nullptr;



  aclTensor* self = nullptr;

  aclTensor* shape1Addr = nullptr;

  aclTensor* shape2Addr = nullptr;



  std::vector<float> selfHostData = {0, 1, 2, 3, 4, 5, 6, 7};

  std::vector<float> shape1HostData = {0, 1, 4, 5};

  std::vector<float> shape2HostData = {2, 3, 6, 7};



  // 创建self aclTensor

  ret = CreateAclTensor(selfHostData, selfShape, &selfDeviceAddr, aclDataType::ACL_FLOAT, &self);

  CHECK_RET(ret == ACL_SUCCESS, return ret);



  ret = CreateAclTensor(shape1HostData, shape1, &shape1DeviceAddr, aclDataType::ACL_FLOAT, &shape1Addr);

  CHECK_RET(ret == ACL_SUCCESS, return ret);

  ret = CreateAclTensor(shape2HostData, shape2, &shape2DeviceAddr, aclDataType::ACL_FLOAT, &shape2Addr);

  CHECK_RET(ret == ACL_SUCCESS, return ret);



  // 创建out aclTensorList

  std::vector<aclTensor*> tmp = {shape1Addr, shape2Addr};

  aclTensorList* out = aclCreateTensorList(tmp.data(), tmp.size());

  CHECK_RET(out != nullptr, return ret);



  // 调用CANN算子库API，需要修改为具体的Api名称

  uint64_t workspaceSize = 0;

  aclOpExecutor *executor;

  // 调用aclnnSplitTensor第一段接口

  ret = aclnnSplitTensorGetWorkspaceSize(self, splitSections, dim, out, &workspaceSize, &executor);

  CHECK_RET(ret == ACL_SUCCESS, LOG_PRINT("aclnnSplitTensorGetWorkspaceSize failed. ERROR: %d\n", ret); return ret);

  // 根据第一段接口计算出的workspaceSize申请device内存

  void *workspaceAddr = nullptr;

  if (workspaceSize > 0) {

    auto ret = aclrtMalloc(&workspaceAddr, workspaceSize, ACL_MEM_MALLOC_HUGE_FIRST);

    CHECK_RET(ret == ACL_SUCCESS, LOG_PRINT("allocate workspace failed. ERROR: %d\n", ret); return ret);

  }

  // 调用aclnnSplitTensor第二段接口

  ret = aclnnSplitTensor(workspaceAddr, workspaceSize, executor, stream);

  CHECK_RET(ret == ACL_SUCCESS, LOG_PRINT("aclnnSplitTensor failed. ERROR: %d\n", ret); return ret);



  ret = aclrtSynchronizeStream(stream);

  CheckResult({shape1, shape2}, {shape1DeviceAddr, shape2DeviceAddr});



  // 6. 释放aclTensor和aclScalar，需要根据具体API的接口定义修改

  aclDestroyTensor(self);

  aclDestroyTensorList(out);

  aclDestroyTensor(shape1Addr);

  aclDestroyTensor(shape2Addr);



  // 7. 释放device 资源

  aclrtFree(selfDeviceAddr);

  aclrtFree(shape1DeviceAddr);

  aclrtFree(shape2DeviceAddr);

  if (workspaceSize > 0) {

    aclrtFree(workspaceAddr);

  }

  aclrtDestroyStream(stream);

  aclrtResetDevice(deviceId);

  aclFinalize();



  return 0;

}