/*
 * Copyright (c) 2019 Samsung Electronics Co., Ltd. All Rights Reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation;
 * version 2.1 of the License.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 */
/**
 * @file nnstreamer-single.h
 * @date 29 March 2019
 * @brief NNStreamer single-shot invocation C-API Header.
 *        This allows to invoke a neural network model directly.
 * @see	https://github.com/nnstreamer/nnstreamer
 * @author MyungJoo Ham <myungjoo.ham@samsung.com>
 * @bug No known bugs except for NYI items
 *
 * @details This is targeting Tizen 5.5 M2.
 */

#ifndef __TIZEN_MACHINELEARNING_NNSTREAMER_SINGLE_H__
#define __TIZEN_MACHINELEARNING_NNSTREAMER_SINGLE_H__

#include <nnstreamer.h>

#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
/**
 * @addtogroup CAPI_ML_NNSTREAMER_SINGLE_MODULE
 * @{
 */

/**
 * @brief A handle of a single-shot instance.
 * @since_tizen 5.5
 */
typedef void *ml_single_h;

/*************
 * MAIN FUNC *
 *************/
/**
 * @brief Opens an ML model and returns the instance as a handle.
 * @details Even if the model has flexible input data dimensions,
 *          input data frames of an instance of a model should share the same dimension.
 * @since_tizen 5.5
 * @remarks %http://tizen.org/privilege/mediastorage is needed if @a model is relevant to media storage.
 * @remarks %http://tizen.org/privilege/externalstorage is needed if @a model is relevant to external storage.
 * @param[out] single This is the model handle opened. Users are required to close
 *                   the given instance with ml_single_close().
 * @param[in] model This is the path to the neural network model file.
 * @param[in] input_info This is required if the given model has flexible input
 *                      dimension, where the input dimension MUST be given
 *                      before executing the model.
 *                      It is required by some custom filters of NNStreamer.
 *                      You may set NULL if it's not required.
 * @param[in] output_info This is required if the given model has flexible output dimension.
 * @param[in] nnfw The neural network framework used to open the given @a model.
 *                 Set #ML_NNFW_TYPE_ANY to let it auto-detect.
 * @param[in] hw Tell the corresponding @a nnfw to use a specific hardware.
 *               Set #ML_NNFW_HW_ANY if it does not matter.
 * @return @c 0 on success. Otherwise a negative error value.
 * @retval #ML_ERROR_NONE Successful.
 * @retval #ML_ERROR_NOT_SUPPORTED Not supported.
 * @retval #ML_ERROR_PERMISSION_DENIED The application does not have the privilege to access to the media storage or external storage.
 * @retval #ML_ERROR_INVALID_PARAMETER Fail. The parameter is invalid.
 * @retval #ML_ERROR_STREAMS_PIPE Failed to start the pipeline.
 * @retval #ML_ERROR_OUT_OF_MEMORY Failed to allocate required memory.
 */
int ml_single_open (ml_single_h *single, const char *model, const ml_tensors_info_h input_info, const ml_tensors_info_h output_info, ml_nnfw_type_e nnfw, ml_nnfw_hw_e hw);

/**
 * @brief Closes the opened model handle.
 * @since_tizen 5.5
 * @param[in] single The model handle to be closed.
 * @return @c 0 on success. Otherwise a negative error value.
 * @retval #ML_ERROR_NONE Successful.
 * @retval #ML_ERROR_NOT_SUPPORTED Not supported.
 * @retval #ML_ERROR_INVALID_PARAMETER Fail. The parameter is invalid (Pipeline is not negotiated yet.)
 */
int ml_single_close (ml_single_h single);

/**
 * @brief Invokes the model with the given input data.
 * @details Even if the model has flexible input data dimensions,
 *          input data frames of an instance of a model should share the same dimension.
 *          Note that this will wait for the result until the invoke process is done. If an application wants to change the time to wait for an output, set the timeout using ml_single_set_timeout().
 * @since_tizen 5.5
 * @param[in] single The model handle to be inferred.
 * @param[in] input The input data to be inferred.
 * @param[out] output The allocated output buffer. The caller is responsible for freeing the output buffer with ml_tensors_data_destroy().
 * @return @c 0 on success. Otherwise a negative error value.
 * @note If the data for the output buffer is allocated by the neural network framework (ML_NNFW_TYPE_CUSTOM_FILTER supports this), then this data will be freed when closing the @a single automatically by the neural network framework, and will not available for use later. It is recommended to copy the data from @a output if it is required to use it after the @a single handle is closed.
 * @retval #ML_ERROR_NONE Successful.
 * @retval #ML_ERROR_NOT_SUPPORTED Not supported.
 * @retval #ML_ERROR_INVALID_PARAMETER Fail. The parameter is invalid.
 * @retval #ML_ERROR_STREAMS_PIPE Failed to push a buffer into source element.
 * @retval #ML_ERROR_TIMED_OUT Failed to get the result from sink element.
 * @retval #ML_ERROR_OUT_OF_MEMORY Failed to allocate required memory.
 */
int ml_single_invoke (ml_single_h single, const ml_tensors_data_h input, ml_tensors_data_h *output);

/**
 * @brief Invokes the model with the given input data with the given tensors information.
 * @details This function changes the input tensors information for the model, and returns the corresponding output data.
 *          A model/framework may not support changing the information.
 *          Note that this will wait for the result until the invoke process is done. If an application wants to change the time to wait for an output, set the timeout using ml_single_set_timeout().
 * @since_tizen 6.0
 * @param[in] single The model handle to be inferred.
 * @param[in] input The input data to be inferred.
 * @param[in] in_info The handle of input tensors information.
 * @param[out] output The allocated output buffer. The caller is responsible for freeing the output buffer with ml_tensors_data_destroy().
 * @param[out] out_info The handle of output tensors information. The caller is responsible for freeing the information with ml_tensors_info_destroy().
 * @return @c 0 on success. Otherwise a negative error value.
 * @retval #ML_ERROR_NONE Successful.
 * @retval #ML_ERROR_NOT_SUPPORTED Not supported.
 * @retval #ML_ERROR_INVALID_PARAMETER Fail. The parameter is invalid.
 * @retval #ML_ERROR_STREAMS_PIPE Failed to push a buffer into source element.
 * @retval #ML_ERROR_TIMED_OUT Failed to get the result from sink element.
 * @retval #ML_ERROR_OUT_OF_MEMORY Failed to allocate required memory.
 */
int ml_single_invoke_dynamic (ml_single_h single, const ml_tensors_data_h input, const ml_tensors_info_h in_info, ml_tensors_data_h *output, ml_tensors_info_h *out_info);

/*************
 * UTILITIES *
 *************/

/**
 * @brief Gets the information (tensor dimension, type, name and so on) of required input data for the given model.
 * @details Note that a model may not have such information if its input type is flexible.
 *          The names of tensors are sometimes unavailable (optional), while its dimensions and types are always available.
 * @since_tizen 5.5
 * @param[in] single The model handle.
 * @param[out] info The handle of input tensors information. The caller is responsible for freeing the information with ml_tensors_info_destroy().
 * @return @c 0 on success. Otherwise a negative error value.
 * @retval #ML_ERROR_NONE Successful.
 * @retval #ML_ERROR_NOT_SUPPORTED Not supported.
 * @retval #ML_ERROR_INVALID_PARAMETER Fail. The parameter is invalid.
 */
int ml_single_get_input_info (ml_single_h single, ml_tensors_info_h *info);

/**
 * @brief Gets the information (tensor dimension, type, name and so on) of output data for the given model.
 * @details Note that a model may not have such information if its output type is flexible and output type is not determined statically.
 *          The names of tensors are sometimes unavailable (optional), while its dimensions and types are always available.
 * @since_tizen 5.5
 * @param[in] single The model handle.
 * @param[out] info The handle of output tensors information. The caller is responsible for freeing the information with ml_tensors_info_destroy().
 * @return @c 0 on success. Otherwise a negative error value.
 * @retval #ML_ERROR_NONE Successful.
 * @retval #ML_ERROR_NOT_SUPPORTED Not supported.
 * @retval #ML_ERROR_INVALID_PARAMETER Fail. The parameter is invalid.
 */
int ml_single_get_output_info (ml_single_h single, ml_tensors_info_h *info);

/**
 * @brief Sets the information (tensor dimension, type, name and so on) of required input data for the given model.
 * @details Note that a model/framework may not support changing the information.
 *          Use ml_single_get_input_info() and ml_single_get_output_info() instead for this framework.
 * @since_tizen 6.0
 * @param[in] single The model handle.
 * @param[in] info The handle of input tensors information.
 * @return @c 0 on success. Otherwise a negative error value.
 * @retval #ML_ERROR_NONE Successful.
 * @retval #ML_ERROR_NOT_SUPPORTED Not supported.
 * @retval #ML_ERROR_INVALID_PARAMETER Fail. The parameter is invalid.
 */
int ml_single_set_input_info (ml_single_h single, const ml_tensors_info_h info);

/**
 * @brief Sets the maximum amount of time to wait for an output, in milliseconds.
 * @since_tizen 5.5
 * @param[in] single The model handle.
 * @param[in] timeout The time to wait for an output.
 * @return @c 0 on success. Otherwise a negative error value.
 * @retval #ML_ERROR_NONE Successful.
 * @retval #ML_ERROR_NOT_SUPPORTED Not supported.
 * @retval #ML_ERROR_INVALID_PARAMETER Fail. The parameter is invalid.
 */
int ml_single_set_timeout (ml_single_h single, unsigned int timeout);

/**
 * @brief Sets the property value for the given model.
 * @details Note that a model/framework may not support changing the property after opening the model.
 * @since_tizen 6.0
 * @param[in] single The model handle.
 * @param[in] name The property name.
 * @param[in] value The property value.
 * @return @c 0 on success. Otherwise a negative error value.
 * @retval #ML_ERROR_NONE Successful.
 * @retval #ML_ERROR_NOT_SUPPORTED Not supported.
 * @retval #ML_ERROR_INVALID_PARAMETER Fail. The parameter is invalid.
 */
int ml_single_set_property (ml_single_h single, const char *name, const char *value);

/**
 * @brief Gets the property value for the given model.
 * @since_tizen 6.0
 * @param[in] single The model handle.
 * @param[in] name The property name.
 * @param[out] value The property value. The caller is responsible for freeing the value using g_free().
 * @return @c 0 on success. Otherwise a negative error value.
 * @retval #ML_ERROR_NONE Successful.
 * @retval #ML_ERROR_NOT_SUPPORTED Not supported.
 * @retval #ML_ERROR_INVALID_PARAMETER Fail. The parameter is invalid.
 */
int ml_single_get_property (ml_single_h single, const char *name, char **value);

/**
 * @}
 */
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* __TIZEN_MACHINELEARNING_NNSTREAMER_SINGLE_H__ */
