/**
 * Copyright 2019-2020 Huawei Technologies Co., Ltd
 *
 * 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.
 */

/**
 * @file hccl.h
 * @brief HCCL API
 */

#ifndef HCCL_H_
#define HCCL_H_

#include <hccl/hccl_types.h>
#include <acl/acl.h>

#ifdef __cplusplus
extern "C" {
#endif // __cplusplus

/**
 * @brief Initialize HCCL.
 *
 * @param clusterInfo A string identifying the cluster info file path, include file name.
 * @param rank A integer identifying the identify for the rank.
 * @param comm A pointer identifying the initialized communication resource.
 * @return HcclResult
 * @see HcclCommDestroy()
 */
extern HcclResult HcclCommInitClusterInfo(const char *clusterInfo, uint32_t rank, HcclComm *comm);

/**
 * @brief Get hccl root info.
 *
 * @param rootInfo A pointer identifying the hccl root info.
 * @return HcclResult
 */
extern HcclResult HcclGetRootInfo(HcclRootInfo *rootInfo);

/**
 * @brief Initialize HCCL with root info.
 *
 * @param nRanks A integer identifying the rank size of the cluster.
 * @param rootInfo A struct identifying the hccl root info.
 * @param rank A integer identifying the identify for the rank.
 * @param comm A pointer identifying the initialized communication resource.
 * @return HcclResult
 * @see HcclCommDestroy()
 */
extern HcclResult HcclCommInitRootInfo(uint32_t nRanks, const HcclRootInfo *rootInfo, uint32_t rank, HcclComm *comm);

/**
 * @brief AllReduce operator.
 *
 * @param sendBuf A pointer identifying the input data address of the operator.
 * @param recvBuf A pointer identifying the output data address of the operator.
 * @param count An integer(u64) identifying the number of the output data.
 * @param dataType The data type of the operator, must be one of the following types: int8, int16, int32, float16, float32.
 * @param op The reduction type of the operator, must be one of the following types: sum, min, max, prod.
 * @param comm A pointer identifying the communication resource based on.
 * @param stream A pointer identifying the stream information.
 * @return HcclResult 
 */
extern HcclResult HcclAllReduce(void *sendBuf, void *recvBuf, uint64_t count, HcclDataType dataType, 
HcclReduceOp op, HcclComm comm, aclrtStream stream);

/**
 * @brief Broadcast operator.
 *
 * @param buf A pointer identifying the data address of the operator.
 * @param count An integer(u64) identifying the number of the data.
 * @param dataType The data type of the operator, must be one of the following types: int8, int32, float16, float32.
 * @param root An integer(u32) identifying the the root rank in the operator.
 * @param comm A pointer identifying the communication resource based on
 * @param stream A pointer identifying the stream information.
 * @return HcclResult 
 */
extern HcclResult HcclBroadcast(void *buf, uint64_t count, HcclDataType dataType, uint32_t root, HcclComm comm, 
aclrtStream stream);

/**
 * @brief ReduceScatter operator.
 *
 * @param sendBuf A pointer identifying the input data address of the operator.
 * @param recvBuf A pointer identifying the output data address of the operator.
 * @param recvCount An integer(u64) identifying the number of the output data.
 * @param dataType The data type of the operator, must be one of the following types: int8, int32, float16, float32.
 * @param op The reduction type of the operator, must be one of the following types: sum, min, max, prod.
 * @param comm A pointer identifying the communication resource based on.
 * @param stream A pointer identifying the stream information.
 * @return HcclResult 
 */
extern HcclResult HcclReduceScatter(void *sendBuf, void *recvBuf, uint64_t recvCount, HcclDataType dataType, 
HcclReduceOp op, HcclComm comm, aclrtStream stream);

/**
 * @brief AllGather operator.
 *
 * @param sendBuf A pointer identifying the input data address of the operator.
 * @param recvBuf A pointer identifying the output data address of the operator.
 * @param sendCount An integer(u64) identifying the number of the input data.
 * @param dataType The data type of the operator, must be one of the following types: int8, int32, float16, float32.
 * @param comm A pointer identifying the communication resource based on.
 * @param stream A pointer identifying the stream information.
 * @return HcclResult 
 */
extern HcclResult HcclAllGather(void *sendBuf, void *recvBuf, uint64_t sendCount, HcclDataType dataType, 
HcclComm comm, aclrtStream stream);

/**
 * @brief Destroy HCCL comm
 *
 * @param comm A pointer identifying the communication resource targetting
 * @return HcclResult
 * @see HcclCommInitClusterInfo()
 */
extern HcclResult HcclCommDestroy(HcclComm comm);

#ifdef __cplusplus
}
#endif // __cplusplus
#endif // HCCL_H_