/*****************************************************************************
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*****************************************************************************/
#pragma once

/**
 * @file
 * @brief Machine learning inference API
 */

#include <stddef.h>
#include <stdint.h>

#if defined(_WIN32)
#    ifdef RML_BUILD
#        define RML_API_ENTRY __declspec(dllexport)
#    else
#        define RML_API_ENTRY __declspec(dllimport)
#    endif
#elif defined(__GNUC__)
#    ifdef RML_BUILD
#        define RML_API_ENTRY __attribute__((visibility("default")))
#    else
#        define RML_API_ENTRY
#    endif
#endif

#ifdef __cplusplus
extern "C" {
#endif

/**
 * @brief Maximal supported tensor rank.
 */
#define RML_TENSOR_MAX_RANK ((size_t) 5)

/**
 * @brief A context handle.
 */
typedef struct _rml_context* rml_context;

/**
 * @brief A graph handle.
 */
typedef struct _rml_graph* rml_graph;

/**
 * @brief A model handle.
 */
typedef struct _rml_model* rml_model;

/**
 * @brief A tensor handle.
 */
typedef struct _rml_tensor* rml_tensor;

/**
 * @brief An Unicode character.
 * UTF-8 encoding is used for Linux and MacOS and UTF-16 is used for Windows.
 */
#if defined(_WIN32)
typedef wchar_t rml_char;
#else
typedef char rml_char;
#endif

/**
 * @brief A storage for multiple strings.
 */
typedef struct _rml_strings
{
    size_t num_items;
    const char* const* items;

} rml_strings;

/**
 * @brief A boolean value.
 */
typedef enum _rml_bool
{
    RML_FALSE = 0, /**< False value. */
    RML_TRUE = 1,  /**< True value. */

} rml_bool;

/**
 * Operation status.
 */
typedef enum _rml_status
{
    RML_OK = 0,                        /**< Operation is successful. */
    RML_ERROR_BAD_MODEL = -100,        /**< A model file has errors. */
    RML_ERROR_BAD_PARAMETER = -110,    /**< A parameter is incorrect. */
    RML_ERROR_DEVICE_NOT_FOUND = -120, /**< A device was not found. */
    RML_ERROR_FILE_NOT_FOUND = -130,   /**< A model file does not exist. */
    RML_ERROR_INTERNAL = -140,         /**< An internal library error. */
    RML_ERROR_MODEL_NOT_READY = -150,  /**< A model is not ready for an operation. */
    RML_ERROR_NOT_IMPLEMENTED = -160,  /**< Functionality is not implemented yet. */
    RML_ERROR_OUT_OF_MEMORY = -170,    /**< Memory allocation is failed. */
    RML_ERROR_UNSUPPORTED_DATA = -180, /**< An unsupported scenario. */

} rml_status;

/**
 * @brief Avaiable backends.
 */
typedef enum _rml_backend
{
    RML_BACKEND_DEFAULT = 0,
    RML_BACKEND_DIRECTML = 410,
    RML_BACKEND_MIOPEN = 420,
    RML_BACKEND_MPS = 430,
    RML_BACKEND_IPU = 500,
    RML_BACKEND_TVM = 600,
    RML_BACKEND_AKS = 700,

} rml_backend;

/**
 * @brief Data type.
 */
typedef enum _rml_dtype
{
    RML_DTYPE_UNSPECIFIED = 0, /**< Unspecified data type. */
    RML_DTYPE_FLOAT32 = 100,   /**< Full precision float type. */
    RML_DTYPE_FLOAT16 = 101,   /**< Half precision float type. */
    RML_DTYPE_UINT8 = 110,     /**< Unsigned 8-bit integer type. */
    RML_DTYPE_INT8 = 111,      /**< Signed 8-bit integer type. */
    RML_DTYPE_UINT32 = 120,    /**< Unsigned 32-bit integer type. */
    RML_DTYPE_INT32 = 121,     /**< Signed 32-bit integer type. */
    RML_DTYPE_UINT16 = 130,    /**< Unsigned 16-bit integer type. */
    RML_DTYPE_INT16 = 131,     /**< Signed 16-bit integer type. */

} rml_dtype;

/**
 * @brief Physical memory layout of the tensor data.
 */
typedef enum _rml_layout
{
    RML_LAYOUT_UNSPECIFIED = 0, /**< Unspecified layout. */

    RML_LAYOUT_SCALAR = 200, /**< Tensor layout for a scalar value. */

    RML_LAYOUT_C = 210, /**< Tensor layout for a one dimensional tensor. */

    RML_LAYOUT_HW = 220, /**< Tensor layout with the folowing dimensions: height, width */
    RML_LAYOUT_NC = 221, /**< Tensor layout for a two dimensional tensor with data stored in
                          * the row-major order, where C - number of elements in a column,
                          * N - number of elements in a row. */

    RML_LAYOUT_CHW = 230, /**< Tensor layout for a single image in planar format
                           * with the following dimensions: number of channels, height, width. */
    RML_LAYOUT_HWC = 231, /**< Tensor layout for a single image in interleaved format
                           * with the following dimensions: height, width, number of channels. */

    RML_LAYOUT_NCHW = 240, /**< Tensor layout with the following dimensions: number of images (batch
                            * size) , number of channels, height and width. */
    RML_LAYOUT_NHWC = 241, /**< Tensor layout with the following dimensions: number of images (batch
                            * size), height, width, number of channels. */
    RML_LAYOUT_OIHW = 242, /**< Tensor layout with the following dimensions: number of output
                            * channels, number of input channels, height, width. */
    RML_LAYOUT_HWIO = 243, /**< Tensor layout with the following dimensions: height, width, number
                            * of input channels, number of output channels. */

} rml_layout;

/**
 * @brief Tensor access mode.
 *
 * Mode indicates abilities to access tensor contents on a CPU.
 */
typedef enum _rml_access_mode
{
    RML_ACCESS_MODE_UNSPECIFIED = 0,   /**< Unspecified access mode. */
    RML_ACCESS_MODE_READ_ONLY = 300,   /**< Allow reading from a tensor. */
    RML_ACCESS_MODE_READ_WRITE = 310,  /**< Allow reading from and writing to a tensor. */
    RML_ACCESS_MODE_WRITE_ONLY = 320,  /**< Allow writing from a tensor. */
    RML_ACCESS_MODE_DEVICE_ONLY = 330, /**< No reading from and writing to a tensor. */

} rml_access_mode;

/**
 * @brief Defines graph format required for loading model from buffer.
 */
typedef enum _rml_graph_format
{
    RML_GRAPH_FORMAT_UNSPECIFIED = 0, /**< Unspecified graph format. */
    RML_GRAPH_FORMAT_TF = 400,        /**< Tensorflow 1.x binary graph format. */
    RML_GRAPH_FORMAT_TF_TXT = 410,    /**< Tensorflow text graph format. */
    RML_GRAPH_FORMAT_ONNX = 420,      /**< ONNX binary graph format. */
    RML_GRAPH_FORMAT_ONNX_TXT = 430,  /**< ONNX text graph format. */
    RML_GRAPH_FORMAT_AMODEL = 500,      /**< AMODEL binary graph format. */
    RML_GRAPH_FORMAT_XMODEL = 510,    /**< XMODEL binary graph format. */

} rml_graph_format;

/**
 * @brief Memory information.
 */
typedef struct _rml_memory_info
{
    /**
     * Total amount of allocated GPU memory.
     */
    size_t gpu_total;

} rml_memory_info;

/**
 * @brief N-dimensional tensor description.
 */
typedef struct _rml_tensor_info
{
    /**
     * Tensor data type.
     */
    rml_dtype dtype;

    /**
     * Physical tensor data layout.
     */
    rml_layout layout;

    /**
     * Tensor shape where axes order must correspond to the data layout.
     */
    uint32_t shape[RML_TENSOR_MAX_RANK];

} rml_tensor_info;

/**
 * @brief Unspecified dimension value (a placeholder value)
 */
#define RML_DIM_UNSPECIFIED 0u

/**
 * @brief Device index for automatic device selection
 */
#define RML_DEVICE_IDX_UNSPECIFIED 0u

/**
 * Context creation parameters.
 */
typedef struct _rml_context_params
{
    /**
     * Device index, corresponding to the backend device query result.
     * Enumeration is started with 1. Use RML_DEVICE_IDX_UNSPECIFIED (0)
     * for auto device selection.
     */
    uint32_t device_idx;

} rml_context_params;

/**
 * Creates a context.
 *
 * @param[in]  params  Context creation parameters, optional, @see #rml_context_params.
 * @param[out] context A pointer to a resulting context handle.
 *
 * @return A valid context handle in case of success and status:
 * - #RML_OK if the operation is successful,
 * - #RML_ERROR_BAD_PARAMETER if the @p params->device_idx is incorrect or the @p context is NULL,
 * - #RML_ERROR_INTERNAL in case of an internal error.
 *
 * To get more details in case of failure, call rmlGetLastError().
 * The context should be released with rmlReleaseContext().
 */
RML_API_ENTRY rml_status rmlCreateDefaultContext(const rml_context_params* params,
                                                 rml_context* context);

/**
 * Creates a context for the specified backend.
 *
 * @param[in]  backend A supported backend enumerator.
 * @param[in]  params  Context creation parameters, optional, @see #rml_context_params.
 * @param[out] context A pointer to a resulting context handle.
 *
 * @return A valid context handle in case of success and status:
 * - #RML_OK if the operation is successful,
 * - #RML_ERROR_BAD_PARAMETER if the @p params->device_idx is incorrect or the @p context is NULL,
 * - #RML_ERROR_UNSUPPORTED_DATA if the specified backend in unsupported,
 * - #RML_ERROR_INTERNAL in case of an internal error.
 *
 * To get more details in case of failure, call rmlGetLastError().
 * The context should be released with rmlReleaseContext().
 */
RML_API_ENTRY rml_status rmlCreateContext(rml_backend backend,
                                          const rml_context_params* params,
                                          rml_context* context);

/**
 * Creates a context from an amodel file, the backend is automatically selected.
 *
 * @param[in]  amodel_path  Path to .amodel file. An Unicode character pointer.
 *                          UTF-8 encoding is used for Linux and MacOS
 *                          and UTF-16 is used for Windows.
 * @param[in]  params  Context creation parameters, optional, @see #rml_context_params.
 * @param[out] context A pointer to a resulting context handle.
 *
 * @return A valid context handle in case of success and status:
 * - #RML_OK if the operation is successful,
 * - #RML_ERROR_BAD_PARAMETER if the @p params->device_idx is incorrect or the @p context is NULL or the @p amodel_path is NULL,
 * - #RML_ERROR_BAD_MODEL if the autoselection algorithm failed to select backend,
 * - #RML_ERROR_INTERNAL in case of an internal error.
 *
 * To get more details in case of failure, call rmlGetLastError().
 * The context should be released with rmlReleaseContext().
 */
RML_API_ENTRY rml_status rmlCreateContextFromAModel(const rml_char* amodel_path,
                                                    const rml_context_params* params,
                                                    rml_context* context);

/**
 * Creates a context from an amodel file in the memory, the backend is automatically selected.
 *
 * @param[in]  amodel_buffer Pointer to amodel file memory.
 * @param[in]  amodel_buffer_size Size of the amodel memory buffer
 * @param[in]  params  Context creation parameters, optional, @see #rml_context_params.
 * @param[out] context A pointer to a resulting context handle.
 *
 * @return A valid context handle in case of success and status:
 * - #RML_OK if the operation is successful,
 * - #RML_ERROR_BAD_PARAMETER if the @p params->device_idx is incorrect or the @p context is NULL or
 * the @p amodel_path is NULL,
 * - #RML_ERROR_BAD_MODEL if the autoselection algorithm failed to select backend,
 * - #RML_ERROR_INTERNAL in case of an internal error.
 *
 * To get more details in case of failure, call rmlGetLastError().
 * The context should be released with rmlReleaseContext().
 */
RML_API_ENTRY rml_status rmlCreateContextFromAModelBuffer(const void* amodel_buffer,
                                                          size_t amodel_buffer_size,
                                                          const rml_context_params* params,
                                                          rml_context* context);

/**
 * Releases a context created with rmlCreateDefaultContext() or another context creating function,
 * invalidates the handle.
 *
 * @param[in] context A valid context handle.
 */
RML_API_ENTRY void rmlReleaseContext(rml_context context);

/**
 * Returns the backend used for context creation.
 *
 * @param[in] context A valid context handle.
 *
 * @return A valid backend enum. If context is not valid, RML_BACKEND_DEFAULT is returned.
 */
RML_API_ENTRY rml_backend rmlGetContextBackend(rml_context context);

/**
 * Creates an N-dimentional tensor with a given description.
 *
 * @param[in]  context A valid context handle.
 * @param[in]  info    Tensor description with all dimensions specified.
 * @param[in]  mode    Tensor data access mode.
 * @param[out] tensor  A pointer to a resulting tensor handle.
 *
 * @return A valid tensor handle in case of success and status:
 * - #RML_OK if the operation is successful,
 * - #RML_ERROR_BAD_PARAMETER if @p context, @p info or @p mode is invalid or @p tensor is NULL,
 * - #RML_ERROR_OUT_OF_MEMORY if memory allocation is failed,
 * - #RML_ERROR_INTERNAL in case of an internal error.
 *
 * To get more details in case of failure, call rmlGetLastError().
 * The tensor should be released with rmlReleaseTensor().
 */
RML_API_ENTRY rml_status rmlCreateTensor(rml_context context,
                                         const rml_tensor_info* info,
                                         rml_access_mode mode,
                                         rml_tensor* tensor);

/**
 * Returns a tensor information.
 *
 * @param[in]  tensor A valid tensor handle.
 * @param[out] info   A pointer to a resulting info structure.
 *
 * @return Tensor information in case of success and status:
 * - #RML_OK if the operation is successful,
 * - #RML_ERROR_BAD_PARAMETER if @p tensor is invalid or @p info is NULL.
 *
 * To get more details in case of failure, call rmlGetLastError().
 */
RML_API_ENTRY rml_status rmlGetTensorInfo(rml_tensor tensor, rml_tensor_info* info);

/**
 * Map the tensor data into the host address and returns a pointer to the mapped region.
 *
 * @param[in]  tensor A valid tensor handle.
 * @param[out] data   A pointer to a resulting data pointer.
 * @param[out] size   A pointer pointer to a resulting size. If not NULL, the referenced
 *                    size value is set to image size, in bytes.
 *
 * @return A data pointer, size (if @p size is not NULL) in case of success and status:
 * - #RML_OK if the operation is successful,
 * - #RML_ERROR_BAD_PARAMETER if @p tensor is invalid or @p data is NULL.
 *
 * To get more details in case of failure, call rmlGetLastError().
 * The mapped data must be unmapped with rmlUnmapTensor().
 */
RML_API_ENTRY rml_status rmlMapTensor(rml_tensor tensor, void** data, size_t* size);

/**
 * Unmaps a previously mapped tensor data.
 *
 * @param[in] tensor A valid tensor handle.
 * @param[in] data   A pointer to the previously mapped data.
 *
 * @return Status:
 * - #RML_OK if the operation is successful,
 * - #RML_ERROR_BAD_PARAMETER if @p data is invalid.
 *
 * To get more details in case of failure, call rmlGetLastError().
 */
RML_API_ENTRY rml_status rmlUnmapTensor(rml_tensor tensor, void* data);

/**
 * Copies data from a tensor to another one.
 *
 * @param[in] src A valid source tensor handle.
 * @param[in] dst A valid destination tensor handle.
 *
 * @return Status:
 * - #RML_OK if the operation is successful,
 * - #RML_ERROR_BAD_PARAMETER if @p src or @p dst is invalid,
 * - #RML_ERROR_INTERNAL in case of an internal error.
 *
 * To get more details in case of failure, call rmlGetLastError().
 */
RML_API_ENTRY rml_status rmlCopyTensor(rml_tensor src, rml_tensor dst);

/**
 * Releases an tensor created with rmlCreateTensor(), invalidates the handle.
 *
 * @param[in] tensor A valid tensor handle.
 */
RML_API_ENTRY void rmlReleaseTensor(rml_tensor tensor);

/**
 * Load graph from a ptotobuf file.
 *
 * @param[in]  context A valid context handle.
 * @param[in]  path  Path to a graph in the TF or ONNX formats.
 *                   An Unicode character pointer.
 *                   UTF-8 encoding is used for Linux and MacOS
 *                   and UTF-16 is used for Windows.
 * @param[out] graph The pointer to a resulting graph handle.
 *
 * @return A valid graph handle in case of success and status:
 * - #RML_OK if the operation is successful,
 * - #RML_ERROR_BAD_PARAMETER if @p path or @p graph is NULL,
 * - #RML_ERROR_FILE_NOT_FOUND if the model file is not found,
 * - #RML_ERROR_BAD_MODEL if the model contains an error.
 *
 * To get more details in case of failure, call rmlGetLastError().
 * The graph should be released with rmlReleaseGraph().
 */
RML_API_ENTRY rml_status rmlLoadGraphFromFile(rml_context context,
                                              const rml_char* path,
                                              rml_graph* graph);

/**
 * Loads graph from a protobuf buffer.
 *
 * @param[in]  context A valid context handle.
 * @param[in]  size   The buffer size.
 * @param[in]  buffer The buffer pointer.
 * @param[in]  format The buffer format.
 * @param[out] graph  The pointer to a resulting graph handle.
 *
 * @return A valid graph handle in case of success and status:
 * - #RML_OK if the operation is successful,
 * - #RML_ERROR_BAD_PARAMETER if @p buffer or @p graph is NULL.
 * - #RML_ERROR_BAD_MODEL if the model contains an error.
 *
 * To get more details in case of failure, call rmlGetLastError().
 * The graph should be released with rmlReleaseGraph().
 */
RML_API_ENTRY rml_status rmlLoadGraphFromBuffer(rml_context context,
                                                size_t size,
                                                const void* buffer,
                                                rml_graph_format format,
                                                rml_graph* graph);

/**
 * Creates a model from a supplied graph.
 *
 * @param[in]  context A valid context handle.
 * @param[in]  graph   A valid graph handle.
 * @param[out] model   A pointer to a resulting model handle.
 *
 * @return A model handle in case of success and status:
 * - #RML_OK if the operation is successful,
 * - #RML_ERROR_BAD_PARAMETER if @p context or @p graph is invalid or @p model is NULL.
 *
 * To get more details in case of failure, call rmlGetLastError().
 */
RML_API_ENTRY rml_status rmlCreateModelFromGraph(rml_context context,
                                                 rml_graph graph,
                                                 rml_model* model);

/**
 * Sets up model output node names.
 *
 * If this function is not called, all leaf graph nodes are considered to be output.
 *
 * @param[in]  model A valid model handle.
 * @param[out] names A pointer to a structure with output names.
 *
 * @return Status:
 * - #RML_OK if the operation is successful,
 * - #RML_ERROR_BAD_PARAMETER if @p model or @p names is invalid.
 *
 * To get more details in case of failure, call rmlGetLastError().
 */
RML_API_ENTRY rml_status rmlSetModelOutputNames(rml_model model, const rml_strings* names);

/**
 * Returns input tensor information by a node name.
 *
 * The @p name my be NULL if there is a single input (placeholder) node.
 *
 * @param[in]  model A valid model handle.
 * @param[in]  name  An optional input node name, in ASCII encoding.
 * @param[out] info  A pointer to a resulting input info structure.
 *                   If rmlSetModelInputInfo() was not previously called,
 *                   some dimensions may be unspecified.
 *
 * @return Input tensor information in case of success and status:
 * - #RML_OK if the operation is successful,
 * - #RML_ERROR_BAD_PARAMETER if @p model or @p name is invalid or @p info is NULL.
 *
 * To get more details in case of failure, call rmlGetLastError().
 */
RML_API_ENTRY rml_status rmlGetModelInputInfo(rml_model model,
                                              const char* name,
                                              rml_tensor_info* info);

/**
 * Sets input tensor information for a node name.
 *
 * This call is optional if all model input dimensions are initially specified.
 * The @p name my be NULL if there is a single input (placeholder) node.
 *
 * @param[in] model A valid model handle.
 * @param[in] name  An input node name, in ASCII encoding.
 * @param[in] info  A pointer to a input info structure.
 *
 * @return Status:
 * - #RML_OK if the operation is successful,
 * - #RML_ERROR_BAD_PARAMETER if @p model or @p name is invalid or @p info is NULL.
 *
 * To get more details in case of failure, call rmlGetLastError().
 */
RML_API_ENTRY rml_status rmlSetModelInputInfo(rml_model model,
                                              const char* name,
                                              const rml_tensor_info* info);

/**
 * Returns input tensor names.
 *
 * Model must be initialized before this call in order to access string names
 * API user must free rml_string::items after usage
 *
 * @param[in]  model A valid model handle.
 * @param[in]  names An empty rml_string type for storing output
 * @param[out] info  A pointer to a stored model input name.
 *
 * @return Output tensor name in case of success and status:
 * - #RML_OK if the operation is successful,
 * - #RML_ERROR_BAD_PARAMETER if @p model or @p output_names is NULL,
 * - #RML_ERROR_MODEL_NOT_READY if unspecified vector.
 *
 * To get more details in case of failure, call rmlGetLastError().
 */
RML_API_ENTRY rml_status rmlGetModelInputNames(rml_model model, rml_strings* names);

/**
 * Returns output tensor names.
 *
 * Model must be initialized before this call in order to access string names
 * API user must free rml_string::items after usage
 *
 * @param[in]  model A valid model handle.
 * @param[in]  names An empty rml_string type for storing output
 * @param[out] info  A pointer to a stored model output name.
 *
 * @return Output tensor name in case of success and status:
 * - #RML_OK if the operation is successful,
 * - #RML_ERROR_BAD_PARAMETER if @p model or @p output_names is NULL,
 * - #RML_ERROR_MODEL_NOT_READY if unspecified vector.
 *
 * To get more details in case of failure, call rmlGetLastError().
 */
RML_API_ENTRY rml_status rmlGetModelOutputNames(rml_model model, rml_strings* names);

/**
 * Set model QOS Info
 *
 * Model must be initialized before this call in order to set QOS info
 *
 * @param[in]  model A valid model handle.
 * @param[in]  qos_strings A valid const rml_strings contains QOS key Strings
 * - Supported key strings: "gops", "fps", "latencyinMS", "priority", "complexity", "utilization", "dataRate"
 * @param[in]  key_values A uint32_t ptr to values to fill for QOS metdata
 *
 * @return Status:
 * - #RML_OK if the operation is successful,
 * - #RML_ERROR_BAD_PARAMETER if @p model or @p qos_strings is invalid.
 *
 * To get more details in case of failure, call rmlGetLastError().
 */
RML_API_ENTRY rml_status rmlSetModelQOS(rml_model model, const rml_strings *qos_strings, const uint32_t *key_values);

/**
 * Get model QOS Info
 *
 * Model must be initialized before this call in order to set QOS info
 *
 * @param[in]  model A valid model handle.
 * @param[in]  qos_key A valid const char* to a valid QOS key
 * @param[in]  value A uint32_t point to fill for QOS attribute return
 *
 * @return Status:
 * - #RML_OK if the operation is successful,
 * - #RML_ERROR_BAD_PARAMETER if @p model or @p qos_strings is invalid.
 *
 * To get more details in case of failure, call rmlGetLastError().
 */
RML_API_ENTRY rml_status rmlGetModelQOS(rml_model model, const char *qos_key, uint32_t* ret_value);

/**
 * Get model input scale factors
 *
 * Model must be initialized before this call in order to get input scale
 *
 * @param[in]  model A valid model handle.
 * @param[in]  input_scale_ptr A float pointer address to assign input scales
 * @param[in]  input_scales_num A size pointer to return number of input scales
 *
 * @return Status:
 * - #RML_OK if the operation is successful,
 * - #RML_ERROR_BAD_PARAMETER if @p model or @p qos_strings is invalid.
 *
 * To get more details in case of failure, call rmlGetLastError().
 */
RML_API_ENTRY rml_status rmlGetModelInputScaleFactor(rml_model model,
                                       const float** input_scale_ptr,
                                       size_t* input_scales_num);

/**
 * Get model output scale factors
 *
 * Model must be initialized before this call in order to get output scales
 *
 * @param[in]  model A valid model handle.
 * @param[in]  output_scale_ptr A float pointer address to assign output scales
 * @param[in]  output_scales_num A size pointer to return number of output scales
 *
 * @return Status:
 * - #RML_OK if the operation is successful,
 * - #RML_ERROR_BAD_PARAMETER if @p model or @p qos_strings is invalid.
 *
 * To get more details in case of failure, call rmlGetLastError().
 */
RML_API_ENTRY rml_status rmlGetModelOutputScaleFactor(rml_model model,
                                        const float** output_scale_ptr,
                                        size_t* output_scales_num);

/**
 * Returns output tensor information.
 *
 * All input dimensions must be specified before this call.
 * The @p name my be NULL if there is a single output node.
 *
 * @param[in]  model A valid model handle.
 * @param[in]  name  A optional output node name, in ASCII encoding.
 * @param[out] info  A pointer to a resulting output info structure.
 *
 * @return Output tensor information in case of success and status:
 * - #RML_OK if the operation is successful,
 * - #RML_ERROR_BAD_PARAMETER if @p model or @p name is invalid or @p info is NULL,
 * - #RML_ERROR_MODEL_NOT_READY if some inputs have unspecified dimensions.
 *
 * To get more details in case of failure, call rmlGetLastError().
 */
RML_API_ENTRY rml_status rmlGetModelOutputInfo(rml_model model,
                                               const char* name,
                                               rml_tensor_info* info);

/**
 * Returns memory usage information.
 *
 * All input dimensions must be specified before this call.
 *
 * @param[in]  model A valid model handle.
 * @param[out] info  A pointer to a resulting #rml_memory_info structure.
 *
 * @return Status:
 * - #RML_OK if the operation is successful,
 * - #RML_ERROR_BAD_PARAMETER if @p model is invalid or @p info is NULL,
 * - #RML_ERROR_MODEL_NOT_READY if some inputs have unspecified dimensions.
 */
RML_API_ENTRY rml_status rmlGetModelMemoryInfo(rml_model model, rml_memory_info* info);

/**
 * Sets up an input tensor for a node with a specified name.
 *
 * All input dimensions must be specified before this call.
 * The @p name my be NULL if there is a single input (placeholder) node.
 *
 * @param[in] model A valid model handle.
 * @param[in] name  A optional input node name, in ASCII encoding.
 * @param[in] input A valid input tensor handle.
 *
 * @return Status:
 * - #RML_OK if the operation is successful,
 * - #RML_ERROR_BAD_PARAMETER if @p model, @p name or @p input is invalid,
 * - #RML_ERROR_MODEL_NOT_READY if some inputs have unspecified dimensions.
 *
 * To get more details in case of failure, call rmlGetLastError().
 */
RML_API_ENTRY rml_status rmlSetModelInput(rml_model model, const char* name, rml_tensor input);

/**
 * Sets up an input tensor for a node with a specified name.
 *
 * All input dimensions must be specified before this call.
 * The @p name my be NULL if there is a single output node.
 *
 * @param[in] model  A valid model handle.
 * @param[in] name   An optional output node name, in ASCII encoding.
 * @param[in] output A valid output tensor handle.
 *
 * @return Status:
 * - #RML_OK if the operation is successful,
 * - #RML_ERROR_BAD_PARAMETER if @p model, @p name or @p output is invalid,
 * - #RML_ERROR_MODEL_NOT_READY if some inputs have unspecified dimensions.
 *
 * To get more details in case of failure, call rmlGetLastError().
 */
RML_API_ENTRY rml_status rmlSetModelOutput(rml_model model, const char* name, rml_tensor output);

/**
 * Prepares a model for inference.
 *
 * All model inputs must be set with rmlSetModelInput() and all model outputs
 * must be set with rmlSetModelOutput() before this function is called.
 *
 * @param[in] model A valid model handle.
 *
 * @return Status:
 * - #RML_OK if the operation is successful,
 * - #RML_ERROR_BAD_PARAMETER if @p model is invalid,
 * - #RML_ERROR_MODEL_NOT_READY if any input or output tensor is not specified,
 * - #RML_ERROR_OUT_OF_MEMORY if memory allocation is failed,
 * - #RML_ERROR_INTERNAL in case of an internal error.
 *
 * To get more details in case of failure, call rmlGetLastError().
 */
RML_API_ENTRY rml_status rmlPrepareModel(rml_model model);

/**
 * Runs inference.
 *
 * All model inputs must be set with rmlSetModelInput() and all model outputs
 * must be set with rmlSetModelOutput() before this function is called.
 *
 * @param[in] model A valid model handle.
 *
 * @return Status:
 * - #RML_OK if the operation is successful,
 * - #RML_ERROR_BAD_PARAMETER if @p model is invalid,
 * - #RML_ERROR_MODEL_NOT_READY if any input or output tensor is not specified,
 * - #RML_ERROR_OUT_OF_MEMORY if memory allocation is failed,
 * - #RML_ERROR_INTERNAL in case of an internal error.
 *
 * To get more details in case of failure, call rmlGetLastError().
 */
RML_API_ENTRY rml_status rmlInfer(rml_model model);

/**
 * Resets internal model states to their initial values.
 *
 * All model inputs must be set with rmlSetModelInput() and all model outputs
 * must be set with rmlSetModelOutput() before this function is called.
 *
 * @param[in] model A valid model handle.
 *
 * @return Status:
 * - #RML_OK if the operation is successful,
 * - #RML_ERROR_BAD_PARAMETER if @p model is invalid,
 * - #RML_ERROR_MODEL_NOT_READY if any input or output tensor is not specified,
 * - #RML_ERROR_INTERNAL in case of an internal error.
 *
 * To get more details in case of failure, call rmlGetLastError().
 */
RML_API_ENTRY rml_status rmlResetModelStates(rml_model model);

/**
 * Releases a model created with rmlCreateModelFromGraph(), invalidates the handle.
 *
 * @param[in] model A valid model handle.
 */
RML_API_ENTRY void rmlReleaseModel(rml_model model);

/**
 * Returns a null-terminated string containing the last operation error message.
 * May be called after some operation returns a status other than #RML_OK.
 * The error message is owned by the library and must NOT be freed by a client.
 * The message is stored in a thread local storage, so this function
 * should be called from the thread where the failure occured.
 *
 * @return A pointer to the formatted message, in ASCII-encoding.
 */
RML_API_ENTRY const char* rmlGetLastError();

/**
 * Set whether logging is enabled.
 *
 * @param[in] backend Backend for which to apply the change
 * @param[in] enabled Whether logging is enabled. Logging is enabled by default.
 */
RML_API_ENTRY void rmlSetLoggingEnabled(rml_backend backend, rml_bool enabled);

/**
 * Set whether performance tracing is enabled.
 *
 * @param[in] backend Backend for which to apply the change
 * @param[in] enabled Whether Perf tracing is enabled. Tracing is enabled by default.
 */
RML_API_ENTRY void rmlSetPerformanceTraceEnabled(rml_backend backend, rml_bool enabled);

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