/*
  ==============================================================================

   This file is part of the JUCE 7 technical preview.
   Copyright (c) 2022 - Raw Material Software Limited

   You may use this code under the terms of the GPL v3
   (see www.gnu.org/licenses).

   For the technical preview this file cannot be licensed commercially.

   JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
   EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
   DISCLAIMED.

  ==============================================================================
*/

#include <juce_core/system/juce_TargetPlatform.h>

#if JucePlugin_Build_Unity

#include "../utility/juce_IncludeModuleHeaders.h"
#include <juce_audio_processors/format_types/juce_LegacyAudioParameter.cpp>

#if JUCE_WINDOWS
 #include "../utility/juce_IncludeSystemHeaders.h"
#endif

#include "juce_UnityPluginInterface.h"

//==============================================================================
namespace juce
{

typedef ComponentPeer* (*createUnityPeerFunctionType) (Component&);
extern createUnityPeerFunctionType juce_createUnityPeerFn;

//==============================================================================
class UnityPeer    : public ComponentPeer,
                     public AsyncUpdater
{
public:
    UnityPeer (Component& ed)
        : ComponentPeer (ed, 0),
          mouseWatcher (*this)
    {
        getEditor().setResizable (false, false);
    }

    //==============================================================================
    Rectangle<int> getBounds() const override                              { return bounds; }
    Point<float> localToGlobal (Point<float> relativePosition) override    { return relativePosition + getBounds().getPosition().toFloat(); }
    Point<float> globalToLocal (Point<float> screenPosition) override      { return screenPosition - getBounds().getPosition().toFloat(); }

    using ComponentPeer::localToGlobal;
    using ComponentPeer::globalToLocal;

    StringArray getAvailableRenderingEngines() override                    { return StringArray ("Software Renderer"); }

    void setBounds (const Rectangle<int>& newBounds, bool) override
    {
        bounds = newBounds;
        mouseWatcher.setBoundsToWatch (bounds);
    }

    bool contains (Point<int> localPos, bool) const override
    {
        if (isPositiveAndBelow (localPos.getX(), getBounds().getWidth())
               && isPositiveAndBelow (localPos.getY(), getBounds().getHeight()))
            return true;

        return false;
    }

    void handleAsyncUpdate() override
    {
        fillPixels();
    }

    //==============================================================================
    AudioProcessorEditor& getEditor()    { return *dynamic_cast<AudioProcessorEditor*> (&getComponent()); }

    void setPixelDataHandle (uint8* handle, int width, int height)
    {
        pixelData = handle;

        textureWidth = width;
        textureHeight = height;

        renderImage = Image (new UnityBitmapImage (pixelData, width, height));
    }

    // N.B. This is NOT an efficient way to do this and you shouldn't use this method in your own code.
    // It works for our purposes here but a much more efficient way would be to use a GL texture.
    void fillPixels()
    {
        if (pixelData == nullptr)
            return;

        LowLevelGraphicsSoftwareRenderer renderer (renderImage);
        renderer.addTransform (AffineTransform::verticalFlip ((float) getComponent().getHeight()));

        handlePaint (renderer);

        for (int i = 0; i < textureWidth * textureHeight * 4; i += 4)
        {
            auto r = pixelData[i + 2];
            auto g = pixelData[i + 1];
            auto b = pixelData[i + 0];

            pixelData[i + 0] = r;
            pixelData[i + 1] = g;
            pixelData[i + 2] = b;
        }
    }

    void forwardMouseEvent (Point<float> position, ModifierKeys mods)
    {
        ModifierKeys::currentModifiers = mods;

        handleMouseEvent (juce::MouseInputSource::mouse, position, mods, juce::MouseInputSource::defaultPressure,
                          juce::MouseInputSource::defaultOrientation, juce::Time::currentTimeMillis());
    }

    void forwardKeyPress (int code, String name, ModifierKeys mods)
    {
        ModifierKeys::currentModifiers = mods;

        handleKeyPress (getKeyPress (code, name));
    }

private:
    //==============================================================================
    struct UnityBitmapImage    : public ImagePixelData
    {
        UnityBitmapImage (uint8* data, int w, int h)
            : ImagePixelData (Image::PixelFormat::ARGB, w, h),
              imageData (data),
              lineStride (width * pixelStride)
        {
        }

        std::unique_ptr<ImageType> createType() const override
        {
            return std::make_unique<SoftwareImageType>();
        }

        std::unique_ptr<LowLevelGraphicsContext> createLowLevelContext() override
        {
            return std::make_unique<LowLevelGraphicsSoftwareRenderer> (Image (this));
        }

        void initialiseBitmapData (Image::BitmapData& bitmap, int x, int y, Image::BitmapData::ReadWriteMode mode) override
        {
            ignoreUnused (mode);

            const auto offset = (size_t) x * (size_t) pixelStride + (size_t) y * (size_t) lineStride;
            bitmap.data = imageData + offset;
            bitmap.size = (size_t) (lineStride * height) - offset;
            bitmap.pixelFormat = pixelFormat;
            bitmap.lineStride = lineStride;
            bitmap.pixelStride = pixelStride;
        }

        ImagePixelData::Ptr clone() override
        {
            auto im = new UnityBitmapImage (imageData, width, height);

            for (int i = 0; i < height; ++i)
                memcpy (im->imageData + i * lineStride, imageData + i * lineStride, (size_t) lineStride);

            return im;
        }

        uint8* imageData;
        int pixelStride = 4, lineStride;

        JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (UnityBitmapImage)
    };

    //==============================================================================
    struct MouseWatcher    : public Timer
    {
        MouseWatcher (ComponentPeer& o)    : owner (o)    {}

        void timerCallback() override
        {
            auto pos = Desktop::getMousePosition();

            if (boundsToWatch.contains (pos) && pos != lastMousePos)
            {
                auto ms = Desktop::getInstance().getMainMouseSource();

                if (! ms.getCurrentModifiers().isLeftButtonDown())
                    owner.handleMouseEvent (juce::MouseInputSource::mouse, owner.globalToLocal (pos.toFloat()), {},
                                            juce::MouseInputSource::defaultPressure, juce::MouseInputSource::defaultOrientation, juce::Time::currentTimeMillis());

                lastMousePos = pos;
            }

        }

        void setBoundsToWatch (Rectangle<int> b)
        {
            if (boundsToWatch != b)
                boundsToWatch = b;

            startTimer (250);
        }

        ComponentPeer& owner;
        Rectangle<int> boundsToWatch;
        Point<int> lastMousePos;
    };

    //==============================================================================
    KeyPress getKeyPress (int keyCode, String name)
    {
        if (keyCode >= 32 && keyCode <= 64)
            return { keyCode, ModifierKeys::currentModifiers, juce::juce_wchar (keyCode) };

        if (keyCode >= 91 && keyCode <= 122)
            return { keyCode, ModifierKeys::currentModifiers, name[0] };

        if (keyCode >= 256 && keyCode <= 265)
            return { juce::KeyPress::numberPad0 + (keyCode - 256), ModifierKeys::currentModifiers, juce::String (keyCode - 256).getCharPointer()[0] };

        if (keyCode == 8)      return { juce::KeyPress::backspaceKey,          ModifierKeys::currentModifiers, {} };
        if (keyCode == 127)    return { juce::KeyPress::deleteKey,             ModifierKeys::currentModifiers, {} };
        if (keyCode == 9)      return { juce::KeyPress::tabKey,                ModifierKeys::currentModifiers, {} };
        if (keyCode == 13)     return { juce::KeyPress::returnKey,             ModifierKeys::currentModifiers, {} };
        if (keyCode == 27)     return { juce::KeyPress::escapeKey,             ModifierKeys::currentModifiers, {} };
        if (keyCode == 32)     return { juce::KeyPress::spaceKey,              ModifierKeys::currentModifiers, {} };
        if (keyCode == 266)    return { juce::KeyPress::numberPadDecimalPoint, ModifierKeys::currentModifiers, {} };
        if (keyCode == 267)    return { juce::KeyPress::numberPadDivide,       ModifierKeys::currentModifiers, {} };
        if (keyCode == 268)    return { juce::KeyPress::numberPadMultiply,     ModifierKeys::currentModifiers, {} };
        if (keyCode == 269)    return { juce::KeyPress::numberPadSubtract,     ModifierKeys::currentModifiers, {} };
        if (keyCode == 270)    return { juce::KeyPress::numberPadAdd,          ModifierKeys::currentModifiers, {} };
        if (keyCode == 272)    return { juce::KeyPress::numberPadEquals,       ModifierKeys::currentModifiers, {} };
        if (keyCode == 273)    return { juce::KeyPress::upKey,                 ModifierKeys::currentModifiers, {} };
        if (keyCode == 274)    return { juce::KeyPress::downKey,               ModifierKeys::currentModifiers, {} };
        if (keyCode == 275)    return { juce::KeyPress::rightKey,              ModifierKeys::currentModifiers, {} };
        if (keyCode == 276)    return { juce::KeyPress::leftKey,               ModifierKeys::currentModifiers, {} };

        return {};
    }

    //==============================================================================
    Rectangle<int> bounds;
    MouseWatcher mouseWatcher;

    uint8* pixelData = nullptr;
    int textureWidth, textureHeight;
    Image renderImage;

    //==============================================================================
    void setMinimised (bool) override                                 {}
    bool isMinimised() const override                                 { return false; }
    void setFullScreen (bool) override                                {}
    bool isFullScreen() const override                                { return false; }
    bool setAlwaysOnTop (bool) override                               { return false; }
    void toFront (bool) override                                      {}
    void toBehind (ComponentPeer*) override                           {}
    bool isFocused() const override                                   { return true; }
    void grabFocus() override                                         {}
    void* getNativeHandle() const override                            { return nullptr; }
    OptionalBorderSize getFrameSizeIfPresent() const override         { return {}; }
    BorderSize<int> getFrameSize() const override                     { return {}; }
    void setVisible (bool) override                                   {}
    void setTitle (const String&) override                            {}
    void setIcon (const Image&) override                              {}
    void textInputRequired (Point<int>, TextInputTarget&) override    {}
    void setAlpha (float) override                                    {}
    void performAnyPendingRepaintsNow() override                      {}
    void repaint (const Rectangle<int>&) override                     {}

    //==============================================================================
    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (UnityPeer)
};

static ComponentPeer* createUnityPeer (Component& c)    { return new UnityPeer (c); }

//==============================================================================
class AudioProcessorUnityWrapper
{
public:
    AudioProcessorUnityWrapper (bool isTemporary)
    {
        pluginInstance.reset (createPluginFilterOfType (AudioProcessor::wrapperType_Unity));

        if (! isTemporary && pluginInstance->hasEditor())
        {
            pluginInstanceEditor.reset (pluginInstance->createEditorIfNeeded());
            pluginInstanceEditor->setVisible (true);
            pluginInstanceEditor->addToDesktop (0);
        }

        juceParameters.update (*pluginInstance, false);
    }

    ~AudioProcessorUnityWrapper()
    {
        if (pluginInstanceEditor != nullptr)
        {
            pluginInstanceEditor->removeFromDesktop();

            PopupMenu::dismissAllActiveMenus();
            pluginInstanceEditor->processor.editorBeingDeleted (pluginInstanceEditor.get());
            pluginInstanceEditor = nullptr;
        }
    }

    void create (UnityAudioEffectState* state)
    {
        // only supported in Unity plugin API > 1.0
        if (state->structSize >= sizeof (UnityAudioEffectState))
            samplesPerBlock = static_cast<int> (state->dspBufferSize);

       #ifdef JucePlugin_PreferredChannelConfigurations
        short configs[][2] = { JucePlugin_PreferredChannelConfigurations };
        const int numConfigs = sizeof (configs) / sizeof (short[2]);

        jassertquiet (numConfigs > 0 && (configs[0][0] > 0 || configs[0][1] > 0));

        pluginInstance->setPlayConfigDetails (configs[0][0], configs[0][1], state->sampleRate, samplesPerBlock);
       #else
        pluginInstance->setRateAndBufferSizeDetails (state->sampleRate, samplesPerBlock);
       #endif

        pluginInstance->prepareToPlay (state->sampleRate, samplesPerBlock);

        scratchBuffer.setSize (jmax (pluginInstance->getTotalNumInputChannels(), pluginInstance->getTotalNumOutputChannels()), samplesPerBlock);
    }

    void release()
    {
        pluginInstance->releaseResources();
    }

    void reset()
    {
        pluginInstance->reset();
    }

    void process (float* inBuffer, float* outBuffer, int bufferSize, int numInChannels, int numOutChannels, bool isBypassed)
    {
        // If the plugin has a bypass parameter, set it to the current bypass state
        if (auto* param = pluginInstance->getBypassParameter())
            if (isBypassed != (param->getValue() >= 0.5f))
                param->setValueNotifyingHost (isBypassed ? 1.0f : 0.0f);

        for (int pos = 0; pos < bufferSize;)
        {
            auto max = jmin (bufferSize - pos, samplesPerBlock);
            processBuffers (inBuffer + (pos * numInChannels), outBuffer + (pos * numOutChannels), max, numInChannels, numOutChannels, isBypassed);

            pos += max;
        }
    }

    void declareParameters (UnityAudioEffectDefinition& definition)
    {
        static std::unique_ptr<UnityAudioParameterDefinition> parametersPtr;
        static int numParams = 0;

        if (parametersPtr == nullptr)
        {
            numParams = (int) juceParameters.size();

            parametersPtr.reset (static_cast<UnityAudioParameterDefinition*> (std::calloc (static_cast<size_t> (numParams),
                                                                              sizeof (UnityAudioParameterDefinition))));

            parameterDescriptions.clear();

            for (int i = 0; i < numParams; ++i)
            {
                auto* parameter = juceParameters.getParamForIndex (i);
                auto& paramDef = parametersPtr.get()[i];

                const auto nameLength = (size_t) numElementsInArray (paramDef.name);
                const auto unitLength = (size_t) numElementsInArray (paramDef.unit);

                parameter->getName ((int) nameLength - 1).copyToUTF8 (paramDef.name, nameLength);

                if (parameter->getLabel().isNotEmpty())
                    parameter->getLabel().copyToUTF8 (paramDef.unit, unitLength);

                parameterDescriptions.add (parameter->getName (15));
                paramDef.description = parameterDescriptions[i].toRawUTF8();

                paramDef.defaultVal = parameter->getDefaultValue();
                paramDef.min = 0.0f;
                paramDef.max = 1.0f;
                paramDef.displayScale = 1.0f;
                paramDef.displayExponent = 1.0f;
            }
        }

        definition.numParameters = static_cast<uint32> (numParams);
        definition.parameterDefintions = parametersPtr.get();
    }

    void setParameter (int index, float value)       { juceParameters.getParamForIndex (index)->setValueNotifyingHost (value); }
    float getParameter (int index) const noexcept    { return juceParameters.getParamForIndex (index)->getValue(); }

    String getParameterString (int index) const noexcept
    {
        auto* param = juceParameters.getParamForIndex (index);
        return param->getText (param->getValue(), 16);
    }

    int getNumInputChannels() const noexcept         { return pluginInstance->getTotalNumInputChannels(); }
    int getNumOutputChannels() const noexcept        { return pluginInstance->getTotalNumOutputChannels(); }

    bool hasEditor() const noexcept                  { return pluginInstance->hasEditor(); }

    UnityPeer& getEditorPeer() const
    {
        auto* peer = dynamic_cast<UnityPeer*> (pluginInstanceEditor->getPeer());

        jassert (peer != nullptr);
        return *peer;
    }

private:
    //==============================================================================
    void processBuffers (float* inBuffer, float* outBuffer, int bufferSize, int numInChannels, int numOutChannels, bool isBypassed)
    {
        int ch;
        for (ch = 0; ch < numInChannels; ++ch)
        {
            using DstSampleType = AudioData::Pointer<AudioData::Float32, AudioData::NativeEndian, AudioData::NonInterleaved, AudioData::NonConst>;
            using SrcSampleType = AudioData::Pointer<AudioData::Float32, AudioData::NativeEndian, AudioData::Interleaved,    AudioData::Const>;

            DstSampleType dstData (scratchBuffer.getWritePointer (ch));
            SrcSampleType srcData (inBuffer + ch, numInChannels);
            dstData.convertSamples (srcData, bufferSize);
        }

        for (; ch < numOutChannels; ++ch)
            scratchBuffer.clear (ch, 0, bufferSize);

        {
            const ScopedLock sl (pluginInstance->getCallbackLock());

            if (pluginInstance->isSuspended())
            {
                scratchBuffer.clear();
            }
            else
            {
                MidiBuffer mb;

                if (isBypassed && pluginInstance->getBypassParameter() == nullptr)
                    pluginInstance->processBlockBypassed (scratchBuffer, mb);
                else
                    pluginInstance->processBlock (scratchBuffer, mb);
            }
        }

        for (ch = 0; ch < numOutChannels; ++ch)
        {
            using DstSampleType = AudioData::Pointer<AudioData::Float32, AudioData::NativeEndian, AudioData::Interleaved,    AudioData::NonConst>;
            using SrcSampleType = AudioData::Pointer<AudioData::Float32, AudioData::NativeEndian, AudioData::NonInterleaved, AudioData::Const>;

            DstSampleType dstData (outBuffer + ch, numOutChannels);
            SrcSampleType srcData (scratchBuffer.getReadPointer (ch));
            dstData.convertSamples (srcData, bufferSize);
        }
    }

    //==============================================================================
    std::unique_ptr<AudioProcessor> pluginInstance;
    std::unique_ptr<AudioProcessorEditor> pluginInstanceEditor;

    int samplesPerBlock = 1024;
    StringArray parameterDescriptions;

    AudioBuffer<float> scratchBuffer;

    LegacyAudioParametersWrapper juceParameters;

    //==============================================================================
    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (AudioProcessorUnityWrapper)
};

//==============================================================================
static HashMap<int, AudioProcessorUnityWrapper*>& getWrapperMap()
{
    static HashMap<int, AudioProcessorUnityWrapper*> wrapperMap;
    return wrapperMap;
}

static void onWrapperCreation (AudioProcessorUnityWrapper* wrapperToAdd)
{
    getWrapperMap().set (std::abs (Random::getSystemRandom().nextInt (65536)), wrapperToAdd);
}

static void onWrapperDeletion (AudioProcessorUnityWrapper* wrapperToRemove)
{
    getWrapperMap().removeValue (wrapperToRemove);
}

//==============================================================================
namespace UnityCallbacks
{
    static int UNITY_INTERFACE_API createCallback (UnityAudioEffectState* state)
    {
        auto* pluginInstance = new AudioProcessorUnityWrapper (false);
        pluginInstance->create (state);

        state->effectData = pluginInstance;

        onWrapperCreation (pluginInstance);

        return 0;
    }

    static int UNITY_INTERFACE_API releaseCallback (UnityAudioEffectState* state)
    {
        auto* pluginInstance = state->getEffectData<AudioProcessorUnityWrapper>();
        pluginInstance->release();

        onWrapperDeletion (pluginInstance);
        delete pluginInstance;

        if (getWrapperMap().size() == 0)
            shutdownJuce_GUI();

        return 0;
    }

    static int UNITY_INTERFACE_API resetCallback (UnityAudioEffectState* state)
    {
        auto* pluginInstance = state->getEffectData<AudioProcessorUnityWrapper>();
        pluginInstance->reset();

        return 0;
    }

    static int UNITY_INTERFACE_API setPositionCallback (UnityAudioEffectState* state, unsigned int pos)
    {
        ignoreUnused (state, pos);

        return 0;
    }

    static int UNITY_INTERFACE_API setFloatParameterCallback (UnityAudioEffectState* state, int index, float value)
    {
        auto* pluginInstance = state->getEffectData<AudioProcessorUnityWrapper>();
        pluginInstance->setParameter (index, value);

        return 0;
    }

    static int UNITY_INTERFACE_API getFloatParameterCallback (UnityAudioEffectState* state, int index, float* value, char* valueStr)
    {
        auto* pluginInstance = state->getEffectData<AudioProcessorUnityWrapper>();
        *value = pluginInstance->getParameter (index);

        pluginInstance->getParameterString (index).copyToUTF8 (valueStr, 15);

        return 0;
    }

    static int UNITY_INTERFACE_API getFloatBufferCallback (UnityAudioEffectState* state, const char* name, float* buffer, int numSamples)
    {
        ignoreUnused (numSamples);

        auto nameStr = String (name);

        if (nameStr == "Editor")
        {
            auto* pluginInstance = state->getEffectData<AudioProcessorUnityWrapper>();

            buffer[0] = pluginInstance->hasEditor() ? 1.0f : 0.0f;
        }
        else if (nameStr == "ID")
        {
            auto* pluginInstance = state->getEffectData<AudioProcessorUnityWrapper>();

            for (HashMap<int, AudioProcessorUnityWrapper*>::Iterator i (getWrapperMap()); i.next();)
            {
                if (i.getValue() == pluginInstance)
                {
                    buffer[0] = (float) i.getKey();
                    break;
                }
            }

            return 0;
        }
        else if (nameStr == "Size")
        {
            auto* pluginInstance = state->getEffectData<AudioProcessorUnityWrapper>();

            auto& editor = pluginInstance->getEditorPeer().getEditor();

            buffer[0] = (float) editor.getBounds().getWidth();
            buffer[1] = (float) editor.getBounds().getHeight();
            buffer[2] = (float) editor.getConstrainer()->getMinimumWidth();
            buffer[3] = (float) editor.getConstrainer()->getMinimumHeight();
            buffer[4] = (float) editor.getConstrainer()->getMaximumWidth();
            buffer[5] = (float) editor.getConstrainer()->getMaximumHeight();
        }

        return 0;
    }

    static int UNITY_INTERFACE_API processCallback (UnityAudioEffectState* state, float* inBuffer, float* outBuffer,
                                                    unsigned int bufferSize, int numInChannels, int numOutChannels)
    {
        auto* pluginInstance = state->getEffectData<AudioProcessorUnityWrapper>();

        if (pluginInstance != nullptr)
        {
            auto isPlaying = ((state->flags & stateIsPlaying) != 0);
            auto isMuted   = ((state->flags & stateIsMuted)   != 0);
            auto isPaused  = ((state->flags & stateIsPaused)  != 0);

            const auto bypassed = ! isPlaying || (isMuted || isPaused);
            pluginInstance->process (inBuffer, outBuffer, static_cast<int> (bufferSize), numInChannels, numOutChannels, bypassed);
        }
        else
        {
            FloatVectorOperations::clear (outBuffer, static_cast<int> (bufferSize) * numOutChannels);
        }

        return 0;
    }
}

//==============================================================================
static void declareEffect (UnityAudioEffectDefinition& definition)
{
    memset (&definition, 0, sizeof (definition));

    std::unique_ptr<AudioProcessorUnityWrapper> wrapper = std::make_unique<AudioProcessorUnityWrapper> (true);

    String name (JucePlugin_Name);
    if (! name.startsWithIgnoreCase ("audioplugin"))
        name = "audioplugin_" + name;

    name.copyToUTF8 (definition.name, (size_t) numElementsInArray (definition.name));

    definition.structSize = sizeof (UnityAudioEffectDefinition);
    definition.parameterStructSize = sizeof (UnityAudioParameterDefinition);

    definition.apiVersion = UNITY_AUDIO_PLUGIN_API_VERSION;
    definition.pluginVersion = JucePlugin_VersionCode;

    // effects must set this to 0, generators > 0
    definition.channels = (wrapper->getNumInputChannels() != 0 ? 0
                                                               : static_cast<uint32> (wrapper->getNumOutputChannels()));

    wrapper->declareParameters (definition);

    definition.create            = UnityCallbacks::createCallback;
    definition.release           = UnityCallbacks::releaseCallback;
    definition.reset             = UnityCallbacks::resetCallback;
    definition.setPosition       = UnityCallbacks::setPositionCallback;
    definition.process           = UnityCallbacks::processCallback;
    definition.setFloatParameter = UnityCallbacks::setFloatParameterCallback;
    definition.getFloatParameter = UnityCallbacks::getFloatParameterCallback;
    definition.getFloatBuffer    = UnityCallbacks::getFloatBufferCallback;
}

} // namespace juce

UNITY_INTERFACE_EXPORT int UNITY_INTERFACE_API UnityGetAudioEffectDefinitions (UnityAudioEffectDefinition*** definitionsPtr)
{
    if (juce::getWrapperMap().size() == 0)
        juce::initialiseJuce_GUI();

    static bool hasInitialised = false;

    if (! hasInitialised)
    {
        juce::PluginHostType::jucePlugInClientCurrentWrapperType = juce::AudioProcessor::wrapperType_Unity;
        juce::juce_createUnityPeerFn = juce::createUnityPeer;

        hasInitialised = true;
    }

    auto* definition = new UnityAudioEffectDefinition();
    juce::declareEffect (*definition);

    *definitionsPtr = &definition;

    return 1;
}

//==============================================================================
static juce::ModifierKeys unityModifiersToJUCE (UnityEventModifiers mods, bool mouseDown, int mouseButton = -1)
{
    int flags = 0;

    if (mouseDown)
    {
        if (mouseButton == 0)
            flags |= juce::ModifierKeys::leftButtonModifier;
        else if (mouseButton == 1)
            flags |= juce::ModifierKeys::rightButtonModifier;
        else if (mouseButton == 2)
            flags |= juce::ModifierKeys::middleButtonModifier;
    }

    if (mods == 0)
        return flags;

    if ((mods & UnityEventModifiers::shift) != 0)        flags |= juce::ModifierKeys::shiftModifier;
    if ((mods & UnityEventModifiers::control) != 0)      flags |= juce::ModifierKeys::ctrlModifier;
    if ((mods & UnityEventModifiers::alt) != 0)          flags |= juce::ModifierKeys::altModifier;
    if ((mods & UnityEventModifiers::command) != 0)      flags |= juce::ModifierKeys::commandModifier;

    return { flags };
}

//==============================================================================
static juce::AudioProcessorUnityWrapper* getWrapperChecked (int id)
{
    auto* wrapper = juce::getWrapperMap()[id];
    jassert (wrapper != nullptr);

    return wrapper;
}

//==============================================================================
static void UNITY_INTERFACE_API onRenderEvent (int id)
{
    getWrapperChecked (id)->getEditorPeer().triggerAsyncUpdate();
}

UNITY_INTERFACE_EXPORT renderCallback UNITY_INTERFACE_API getRenderCallback()
{
    return onRenderEvent;
}

UNITY_INTERFACE_EXPORT void UNITY_INTERFACE_API unityInitialiseTexture (int id, void* data, int w, int h)
{
    getWrapperChecked (id)->getEditorPeer().setPixelDataHandle (reinterpret_cast<juce::uint8*> (data), w, h);
}

UNITY_INTERFACE_EXPORT void UNITY_INTERFACE_API unityMouseDown (int id, float x, float y, UnityEventModifiers unityMods, int button)
{
    getWrapperChecked (id)->getEditorPeer().forwardMouseEvent ({ x, y }, unityModifiersToJUCE (unityMods, true, button));
}

UNITY_INTERFACE_EXPORT void UNITY_INTERFACE_API unityMouseDrag (int id, float x, float y, UnityEventModifiers unityMods, int button)
{
    getWrapperChecked (id)->getEditorPeer().forwardMouseEvent ({ x, y }, unityModifiersToJUCE (unityMods, true, button));
}

UNITY_INTERFACE_EXPORT void UNITY_INTERFACE_API unityMouseUp (int id, float x, float y, UnityEventModifiers unityMods)
{
    getWrapperChecked (id)->getEditorPeer().forwardMouseEvent ({ x, y }, unityModifiersToJUCE (unityMods, false));
}

UNITY_INTERFACE_EXPORT void UNITY_INTERFACE_API unityKeyEvent (int id, int code, UnityEventModifiers mods, const char* name)
{
    getWrapperChecked (id)->getEditorPeer().forwardKeyPress (code, name, unityModifiersToJUCE (mods, false));
}

UNITY_INTERFACE_EXPORT void UNITY_INTERFACE_API unitySetScreenBounds (int id, float x, float y, float w, float h)
{
    getWrapperChecked (id)->getEditorPeer().getEditor().setBounds ({ (int) x, (int) y, (int) w, (int) h });
}

//==============================================================================
#if JUCE_WINDOWS
 JUCE_BEGIN_IGNORE_WARNINGS_GCC_LIKE ("-Wmissing-prototypes")

 extern "C" BOOL WINAPI DllMain (HINSTANCE instance, DWORD reason, LPVOID)
 {
     if (reason == DLL_PROCESS_ATTACH)
         juce::Process::setCurrentModuleInstanceHandle (instance);

     return true;
 }

 JUCE_END_IGNORE_WARNINGS_GCC_LIKE
#endif

#endif