// This file is part of OpenCV project.
// It is subject to the license terms in the LICENSE file found in the top-level directory
// of this distribution and at http://opencv.org/license.html.
//
// Copyright (C) 2018-2019, Intel Corporation, all rights reserved.
// Third party copyrights are property of their respective owners.

#ifndef __OPENCV_DNN_OP_INF_ENGINE_HPP__
#define __OPENCV_DNN_OP_INF_ENGINE_HPP__

#include "opencv2/core/cvdef.h"
#include "opencv2/core/cvstd.hpp"
#include "opencv2/dnn.hpp"

#include "opencv2/core/async.hpp"
#include "opencv2/core/detail/async_promise.hpp"

#include "opencv2/dnn/utils/inference_engine.hpp"

#ifdef HAVE_INF_ENGINE

#define INF_ENGINE_RELEASE_2018R5 2018050000
#define INF_ENGINE_RELEASE_2019R1 2019010000
#define INF_ENGINE_RELEASE_2019R2 2019020000

#ifndef INF_ENGINE_RELEASE
#warning("IE version have not been provided via command-line. Using 2019R2 by default")
#define INF_ENGINE_RELEASE INF_ENGINE_RELEASE_2019R2
#endif

#define INF_ENGINE_VER_MAJOR_GT(ver) (((INF_ENGINE_RELEASE) / 10000) > ((ver) / 10000))
#define INF_ENGINE_VER_MAJOR_GE(ver) (((INF_ENGINE_RELEASE) / 10000) >= ((ver) / 10000))
#define INF_ENGINE_VER_MAJOR_LT(ver) (((INF_ENGINE_RELEASE) / 10000) < ((ver) / 10000))
#define INF_ENGINE_VER_MAJOR_LE(ver) (((INF_ENGINE_RELEASE) / 10000) <= ((ver) / 10000))
#define INF_ENGINE_VER_MAJOR_EQ(ver) (((INF_ENGINE_RELEASE) / 10000) == ((ver) / 10000))

#if defined(__GNUC__) && __GNUC__ >= 5
//#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wsuggest-override"
#endif

//#define INFERENCE_ENGINE_DEPRECATED  // turn off deprecation warnings from IE
//there is no way to suppress warnigns from IE only at this moment, so we are forced to suppress warnings globally
#if defined(__GNUC__)
#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
#endif
#ifdef _MSC_VER
#pragma warning(disable: 4996)  // was declared deprecated
#endif

#if defined(__GNUC__)
#pragma GCC visibility push(default)
#endif

#include <inference_engine.hpp>

#include <ie_builders.hpp>

#if defined(__GNUC__)
#pragma GCC visibility pop
#endif

#if defined(__GNUC__) && __GNUC__ >= 5
//#pragma GCC diagnostic pop
#endif

#endif  // HAVE_INF_ENGINE

namespace cv { namespace dnn {

#ifdef HAVE_INF_ENGINE

class InfEngineBackendNet
{
public:
    InfEngineBackendNet();

    InfEngineBackendNet(InferenceEngine::CNNNetwork& net);

    void addLayer(InferenceEngine::Builder::Layer& layer);

    void addOutput(const std::string& name);

    void connect(const std::vector<Ptr<BackendWrapper> >& inputs,
                 const std::vector<Ptr<BackendWrapper> >& outputs,
                 const std::string& layerName);

    bool isInitialized();

    void init(int targetId);

    void forward(const std::vector<Ptr<BackendWrapper> >& outBlobsWrappers,
                 bool isAsync);

    void initPlugin(InferenceEngine::ICNNNetwork& net);

    void addBlobs(const std::vector<cv::Ptr<BackendWrapper> >& ptrs);

private:
    InferenceEngine::Builder::Network netBuilder;

    InferenceEngine::InferenceEnginePluginPtr enginePtr;
    InferenceEngine::InferencePlugin plugin;
    InferenceEngine::ExecutableNetwork netExec;
    InferenceEngine::BlobMap allBlobs;
    InferenceEngine::TargetDevice targetDevice;

    struct InfEngineReqWrapper
    {
        InfEngineReqWrapper() : isReady(true) {}

        void makePromises(const std::vector<Ptr<BackendWrapper> >& outs);

        InferenceEngine::InferRequest req;
        std::vector<cv::AsyncPromise> outProms;
        std::vector<std::string> outsNames;
        bool isReady;
    };

    std::vector<Ptr<InfEngineReqWrapper> > infRequests;

    InferenceEngine::CNNNetwork cnn;
    bool hasNetOwner;

    std::map<std::string, int> layers;
    std::vector<std::string> requestedOutputs;

    std::set<int> unconnectedLayersIds;
};

class InfEngineBackendNode : public BackendNode
{
public:
    InfEngineBackendNode(const InferenceEngine::Builder::Layer& layer);

    void connect(std::vector<Ptr<BackendWrapper> >& inputs,
                 std::vector<Ptr<BackendWrapper> >& outputs);

    // Inference Engine network object that allows to obtain the outputs of this layer.
    InferenceEngine::Builder::Layer layer;
    Ptr<InfEngineBackendNet> net;
};

class InfEngineBackendWrapper : public BackendWrapper
{
public:
    InfEngineBackendWrapper(int targetId, const Mat& m);

    InfEngineBackendWrapper(Ptr<BackendWrapper> wrapper);

    ~InfEngineBackendWrapper();

    static Ptr<BackendWrapper> create(Ptr<BackendWrapper> wrapper);

    virtual void copyToHost() CV_OVERRIDE;

    virtual void setHostDirty() CV_OVERRIDE;

    InferenceEngine::DataPtr dataPtr;
    InferenceEngine::Blob::Ptr blob;
    AsyncArray futureMat;
};

InferenceEngine::Blob::Ptr wrapToInfEngineBlob(const Mat& m, InferenceEngine::Layout layout = InferenceEngine::Layout::ANY);

InferenceEngine::Blob::Ptr wrapToInfEngineBlob(const Mat& m, const std::vector<size_t>& shape, InferenceEngine::Layout layout);

InferenceEngine::DataPtr infEngineDataNode(const Ptr<BackendWrapper>& ptr);

Mat infEngineBlobToMat(const InferenceEngine::Blob::Ptr& blob);

// Convert Inference Engine blob with FP32 precision to FP16 precision.
// Allocates memory for a new blob.
InferenceEngine::Blob::Ptr convertFp16(const InferenceEngine::Blob::Ptr& blob);

void addConstantData(const std::string& name, InferenceEngine::Blob::Ptr data, InferenceEngine::Builder::Layer& l);

// This is a fake class to run networks from Model Optimizer. Objects of that
// class simulate responses of layers are imported by OpenCV and supported by
// Inference Engine. The main difference is that they do not perform forward pass.
class InfEngineBackendLayer : public Layer
{
public:
    InfEngineBackendLayer(const InferenceEngine::CNNNetwork &t_net_) : t_net(t_net_) {};

    virtual bool getMemoryShapes(const std::vector<MatShape> &inputs,
                                 const int requiredOutputs,
                                 std::vector<MatShape> &outputs,
                                 std::vector<MatShape> &internals) const CV_OVERRIDE;

    virtual void forward(InputArrayOfArrays inputs, OutputArrayOfArrays outputs,
                         OutputArrayOfArrays internals) CV_OVERRIDE;

    virtual bool supportBackend(int backendId) CV_OVERRIDE;

private:
    InferenceEngine::CNNNetwork t_net;
};

CV__DNN_INLINE_NS_BEGIN

bool isMyriadX();

CV__DNN_INLINE_NS_END

#endif  // HAVE_INF_ENGINE

bool haveInfEngine();

void forwardInfEngine(const std::vector<Ptr<BackendWrapper> >& outBlobsWrappers,
                      Ptr<BackendNode>& node, bool isAsync);

}}  // namespace dnn, namespace cv

#endif  // __OPENCV_DNN_OP_INF_ENGINE_HPP__