/*
 * DISTRHO Plugin Framework (DPF)
 * Copyright (C) 2012-2022 Filipe Coelho <falktx@falktx.com>
 *
 * Permission to use, copy, modify, and/or distribute this software for any purpose with
 * or without fee is hereby granted, provided that the above copyright notice and this
 * permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD
 * TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN
 * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include "DistrhoPluginInternal.hpp"
#include "extra/ScopedPointer.hpp"

#if DISTRHO_PLUGIN_HAS_UI
# include "DistrhoUIInternal.hpp"
# include "extra/Mutex.hpp"
#endif

#include "clap/entry.h"
#include "clap/plugin-factory.h"
#include "clap/ext/audio-ports.h"
#include "clap/ext/gui.h"
#include "clap/ext/params.h"

START_NAMESPACE_DISTRHO

// --------------------------------------------------------------------------------------------------------------------

struct ClapEventQueue
{
   #if DISTRHO_PLUGIN_HAS_UI
    enum EventType {
        kEventGestureBegin,
        kEventGestureEnd,
        kEventParamSet
    };

    struct Event {
        EventType type;
        uint32_t index;
        float value;
    };

    struct Queue {
        Mutex lock;
        uint allocated;
        uint used;
        Event* events;

        Queue()
            : allocated(0),
              used(0),
              events(nullptr) {}

        ~Queue()
        {
            delete[] events;
        }

        void addEventFromUI(const Event& event)
        {
            const MutexLocker cml(lock);

            if (events == nullptr)
            {
                events = static_cast<Event*>(std::malloc(sizeof(Event) * 8));
                allocated = 8;
            }
            else if (used + 1 > allocated)
            {
                allocated = used * 2;
                events = static_cast<Event*>(std::realloc(events, sizeof(Event) * allocated));
            }

            std::memcpy(&events[used++], &event, sizeof(Event));
        }
    } fEventQueue;
   #endif

   #if DISTRHO_PLUGIN_HAS_UI && DISTRHO_PLUGIN_WANT_STATE
    virtual void setStateFromUI(const char* key, const char* value) = 0;
   #endif

    struct CachedParameters {
        uint numParams;
        bool* changed;
        float* values;

        CachedParameters()
            : changed(nullptr),
              values(nullptr) {}

        ~CachedParameters()
        {
            delete[] changed;
            delete[] values;
        }

        void setup(const uint numParameters)
        {
            if (numParameters == 0)
                return;

            numParams = numParameters;
            changed = new bool[numParameters];
            values = new float[numParameters];

            std::memset(changed, 0, sizeof(bool)*numParameters);
            std::memset(values, 0, sizeof(float)*numParameters);
        }
    } fCachedParameters;

    virtual ~ClapEventQueue() {}
};

// --------------------------------------------------------------------------------------------------------------------

#if DISTRHO_PLUGIN_HAS_UI

#if ! DISTRHO_PLUGIN_WANT_STATE
static constexpr const setStateFunc setStateCallback = nullptr;
#endif
#if ! DISTRHO_PLUGIN_WANT_MIDI_INPUT
static constexpr const sendNoteFunc sendNoteCallback = nullptr;
#endif

/**
 * CLAP UI class.
 */
class ClapUI : public DGL_NAMESPACE::IdleCallback
{
public:
    ClapUI(PluginExporter& plugin, ClapEventQueue* const eventQueue, const bool isFloating)
        : fPlugin(plugin),
          fPluinEventQueue(eventQueue),
          fEventQueue(eventQueue->fEventQueue),
          fCachedParameters(eventQueue->fCachedParameters),
          fUI(),
          fIsFloating(isFloating),
          fCallbackRegistered(false),
          fScaleFactor(0.0),
          fParentWindow(0),
          fTransientWindow(0)
    {
    }

    ~ClapUI() override
    {
        if (fCallbackRegistered)
        {
           #if defined(DISTRHO_OS_MAC) || defined(DISTRHO_OS_WINDOWS)
            if (UIExporter* const ui = fUI.get())
                ui->removeIdleCallbackForVST3(this);
           #endif
        }
    }

    bool setScaleFactor(const double scaleFactor)
    {
        if (d_isEqual(fScaleFactor, scaleFactor))
            return true;

        fScaleFactor = scaleFactor;

        if (UIExporter* const ui = fUI.get())
            ui->notifyScaleFactorChanged(scaleFactor);

        return true;
    }

    bool getSize(uint32_t* const width, uint32_t* const height) const
    {
        if (UIExporter* const ui = fUI.get())
        {
            *width = ui->getWidth();
            *height = ui->getHeight();
            return true;
        }

       #if defined(DISTRHO_UI_DEFAULT_WIDTH) && defined(DISTRHO_UI_DEFAULT_HEIGHT)
        *width = DISTRHO_UI_DEFAULT_WIDTH;
        *height = DISTRHO_UI_DEFAULT_HEIGHT;
       #else
        UIExporter tmpUI(nullptr, 0, fPlugin.getSampleRate(),
                         nullptr, nullptr, nullptr, nullptr, nullptr, nullptr, d_nextBundlePath,
                         fPlugin.getInstancePointer(), fScaleFactor);
        *width = tmpUI.getWidth();
        *height = tmpUI.getHeight();
        tmpUI.quit();
       #endif

        return true;
    }

    bool canResize() const noexcept
    {
       #if DISTRHO_UI_USER_RESIZABLE
        if (UIExporter* const ui = fUI.get())
            return ui->isResizable();
       #endif
        return false;
    }

    bool getResizeHints(clap_gui_resize_hints_t* const hints) const
    {
        if (canResize())
        {
            uint minimumWidth, minimumHeight;
            bool keepAspectRatio;
            fUI->getGeometryConstraints(minimumWidth, minimumHeight, keepAspectRatio);

            hints->can_resize_horizontally = true;
            hints->can_resize_vertically = true;
            hints->preserve_aspect_ratio = keepAspectRatio;
            hints->aspect_ratio_width = minimumWidth;
            hints->aspect_ratio_height = minimumHeight;

            return true;
        }

        hints->can_resize_horizontally = false;
        hints->can_resize_vertically = false;
        hints->preserve_aspect_ratio = false;
        hints->aspect_ratio_width = 0;
        hints->aspect_ratio_height = 0;

        return false;
    }

    bool adjustSize(uint32_t* const width, uint32_t* const height) const
    {
        if (canResize())
        {
            uint minimumWidth, minimumHeight;
            bool keepAspectRatio;
            fUI->getGeometryConstraints(minimumWidth, minimumHeight, keepAspectRatio);

            if (keepAspectRatio)
            {
                if (*width < 1)
                    *width = 1;
                if (*height < 1)
                    *height = 1;

                const double ratio = static_cast<double>(minimumWidth) / static_cast<double>(minimumHeight);
                const double reqRatio = static_cast<double>(*width) / static_cast<double>(*height);

                if (d_isNotEqual(ratio, reqRatio))
                {
                    // fix width
                    if (reqRatio > ratio)
                        *width = static_cast<int32_t>(*height * ratio + 0.5);
                    // fix height
                    else
                        *height = static_cast<int32_t>(static_cast<double>(*width) / ratio + 0.5);
                }
            }

            if (minimumWidth > *width)
                *width = minimumWidth;
            if (minimumHeight > *height)
                *height = minimumHeight;
            
            return true;
        }

        return false;
    }

    bool setSizeFromHost(const uint32_t width, const uint32_t height)
    {
        if (UIExporter* const ui = fUI.get())
        {
            ui->setWindowSizeFromHost(width, height);
            return true;
        }

        return false;
    }

    bool setParent(const clap_window_t* const window)
    {
        if (fIsFloating)
            return false;

        fParentWindow = window->uptr;

        /*
        if (fUI != nullptr)
            createUI();
        */

        return true;
    }

    bool setTransient(const clap_window_t* const window)
    {
        if (! fIsFloating)
            return false;

        fTransientWindow = window->uptr;

        if (UIExporter* const ui = fUI.get())
            ui->setWindowTransientWinId(window->uptr);

        return true;
    }

    void suggestTitle(const char* const title)
    {
        if (! fIsFloating)
            return;

        fWindowTitle = title;

        if (UIExporter* const ui = fUI.get())
            ui->setWindowTitle(title);
    }

    bool show()
    {
        if (fUI == nullptr)
            createUI();

        if (fIsFloating)
            fUI->setWindowVisible(true);

       #if defined(DISTRHO_OS_MAC) || defined(DISTRHO_OS_WINDOWS)
        fUI->addIdleCallbackForVST3(this, 16);
       #endif
        fCallbackRegistered = true;
        return true;
    }

    bool hide()
    {
        if (UIExporter* const ui = fUI.get())
        {
            ui->setWindowVisible(false);
           #if defined(DISTRHO_OS_MAC) || defined(DISTRHO_OS_WINDOWS)
            ui->removeIdleCallbackForVST3(this);
           #endif
            fCallbackRegistered = false;
        }

        return true;
    }

    // ----------------------------------------------------------------------------------------------------------------

private:
    // Plugin and UI
    PluginExporter& fPlugin;
    ClapEventQueue* const fPluinEventQueue;
    ClapEventQueue::Queue& fEventQueue;
    ClapEventQueue::CachedParameters& fCachedParameters;
    ScopedPointer<UIExporter> fUI;

    const bool fIsFloating;

    // Temporary data
    bool fCallbackRegistered;
    double fScaleFactor;
    uintptr_t fParentWindow;
    uintptr_t fTransientWindow;
    String fWindowTitle;

    // ----------------------------------------------------------------------------------------------------------------

    void createUI()
    {
        DISTRHO_SAFE_ASSERT_RETURN(fUI == nullptr,);

        fUI = new UIExporter(this,
                             fParentWindow,
                             fPlugin.getSampleRate(),
                             editParameterCallback,
                             setParameterCallback,
                             setStateCallback,
                             sendNoteCallback,
                             setSizeCallback,
                             fileRequestCallback,
                             d_nextBundlePath,
                             fPlugin.getInstancePointer(),
                             fScaleFactor);

        if (fIsFloating)
        {
            if (fWindowTitle.isNotEmpty())
                fUI->setWindowTitle(fWindowTitle);

            if (fTransientWindow != 0)
                fUI->setWindowTransientWinId(fTransientWindow);
        }
    }

    void idleCallback() override
    {
       #if defined(DISTRHO_OS_MAC) || defined(DISTRHO_OS_WINDOWS)
        if (UIExporter* const ui = fUI.get())
        {
            ui->idleForVST3();

            for (uint i=0; i<fCachedParameters.numParams; ++i)
            {
                if (fCachedParameters.changed[i])
                {
                    fCachedParameters.changed[i] = false;
                    ui->parameterChanged(i, fCachedParameters.values[i]);
                }
            }
        }
       #endif
    }

    // ----------------------------------------------------------------------------------------------------------------
    // DPF callbacks

    void editParameter(const uint32_t rindex, const bool started) const
    {
        const ClapEventQueue::Event ev = {
            started ? ClapEventQueue::kEventGestureBegin : ClapEventQueue::kEventGestureBegin,
            rindex, 0.f
        };
        fEventQueue.addEventFromUI(ev);
    }

    static void editParameterCallback(void* const ptr, const uint32_t rindex, const bool started)
    {
        static_cast<ClapUI*>(ptr)->editParameter(rindex, started);
    }

    void setParameterValue(const uint32_t rindex, const float value)
    {
        const ClapEventQueue::Event ev = {
            ClapEventQueue::kEventParamSet,
            rindex, value
        };
        fEventQueue.addEventFromUI(ev);
    }

    static void setParameterCallback(void* const ptr, const uint32_t rindex, const float value)
    {
        static_cast<ClapUI*>(ptr)->setParameterValue(rindex, value);
    }

    void setSizeFromPlugin(uint, uint)
    {
    }

    static void setSizeCallback(void* const ptr, const uint width, const uint height)
    {
        static_cast<ClapUI*>(ptr)->setSizeFromPlugin(width, height);
    }

   #if DISTRHO_PLUGIN_WANT_STATE
    void setState(const char* const key, const char* const value)
    {
        fPluinEventQueue->setStateFromUI(key, value);
    }

    static void setStateCallback(void* const ptr, const char* key, const char* value)
    {
        static_cast<ClapUI*>(ptr)->setState(key, value);
    }
   #endif

   #if DISTRHO_PLUGIN_WANT_MIDI_INPUT
    void sendNote(const uint8_t channel, const uint8_t note, const uint8_t velocity)
    {
    }

    static void sendNoteCallback(void* const ptr, const uint8_t channel, const uint8_t note, const uint8_t velocity)
    {
        static_cast<ClapUI*>(ptr)->sendNote(channel, note, velocity);
    }
   #endif

    bool fileRequest(const char*)
    {
        return true;
    }

    static bool fileRequestCallback(void* const ptr, const char* const key)
    {
        return static_cast<ClapUI*>(ptr)->fileRequest(key);
    }
};

// --------------------------------------------------------------------------------------------------------------------

#endif // DISTRHO_PLUGIN_HAS_UI

#if ! DISTRHO_PLUGIN_WANT_MIDI_OUTPUT
static constexpr const writeMidiFunc writeMidiCallback = nullptr;
#endif
#if ! DISTRHO_PLUGIN_WANT_PARAMETER_VALUE_CHANGE_REQUEST
static constexpr const requestParameterValueChangeFunc requestParameterValueChangeCallback = nullptr;
#endif
#if ! DISTRHO_PLUGIN_WANT_STATE
static constexpr const updateStateValueFunc updateStateValueCallback = nullptr;
#endif

// --------------------------------------------------------------------------------------------------------------------

/**
 * CLAP plugin class.
 */
class PluginCLAP : ClapEventQueue
{
public:
    PluginCLAP(const clap_host_t* const host)
        : fPlugin(this,
                  writeMidiCallback,
                  requestParameterValueChangeCallback,
                  updateStateValueCallback),
          fHost(host),
          fOutputEvents(nullptr)
    {
        fCachedParameters.setup(fPlugin.getParameterCount());
    }

    // ----------------------------------------------------------------------------------------------------------------
    // core

    bool init()
    {
        if (!clap_version_is_compatible(fHost->clap_version))
            return false;

        // TODO check host features
        return true;
    }

    void activate(const double sampleRate, const uint32_t maxFramesCount)
    {
        fPlugin.setSampleRate(sampleRate, true);
        fPlugin.setBufferSize(maxFramesCount, true);
        fPlugin.activate();
    }

    void deactivate()
    {
        fPlugin.deactivate();
    }

    bool process(const clap_process_t* const process)
    {
       #if DISTRHO_PLUGIN_HAS_UI
        if (const clap_output_events_t* const outputEvents = process->out_events)
        {
            const MutexTryLocker cmtl(fEventQueue.lock);

            if (cmtl.wasLocked())
            {
                // reuse the same struct for gesture and parameters, they are compatible up to where it matters
                clap_event_param_value_t clapEvent = {
                    { 0, 0, 0, 0, CLAP_EVENT_IS_LIVE },
                    0, nullptr, 0, 0, 0, 0, 0.0
                };

                for (uint32_t i=0; i<fEventQueue.used; ++i)
                {
                    const Event& event(fEventQueue.events[i]);

                    switch (event.type)
                    {
                    case kEventGestureBegin:
                        clapEvent.header.size = sizeof(clap_event_param_gesture_t);
                        clapEvent.header.type = CLAP_EVENT_PARAM_GESTURE_BEGIN;
                        clapEvent.param_id = event.index;
                        break;
                    case kEventGestureEnd:
                        clapEvent.header.size = sizeof(clap_event_param_gesture_t);
                        clapEvent.header.type = CLAP_EVENT_PARAM_GESTURE_END;
                        clapEvent.param_id = event.index;
                        break;
                    case kEventParamSet:
                        clapEvent.header.size = sizeof(clap_event_param_value_t);
                        clapEvent.header.type = CLAP_EVENT_PARAM_VALUE;
                        clapEvent.param_id = event.index;
                        clapEvent.value = event.value;
                        fPlugin.setParameterValue(event.index, event.value);
                        break;
                    default:
                        continue;
                    }

                    outputEvents->try_push(outputEvents, &clapEvent.header);
                }

                fEventQueue.used = 0;
            }
        }
       #endif

       #if DISTRHO_PLUGIN_WANT_TIMEPOS
        if (const clap_event_transport_t* const transport = process->transport)
        {
            fTimePosition.playing = transport->flags & CLAP_TRANSPORT_IS_PLAYING;

            fTimePosition.frame = process->steady_time >= 0 ? process->steady_time : 0;

            if (transport->flags & CLAP_TRANSPORT_HAS_TEMPO)
                fTimePosition.bbt.beatsPerMinute = transport->tempo;
            else
                fTimePosition.bbt.beatsPerMinute = 120.0;

            // ticksPerBeat is not possible with CLAP
            fTimePosition.bbt.ticksPerBeat = 1920.0;

            // TODO verify if this works or makes any sense
            if ((transport->flags & (CLAP_TRANSPORT_HAS_BEATS_TIMELINE|CLAP_TRANSPORT_HAS_TIME_SIGNATURE)) == (CLAP_TRANSPORT_HAS_BEATS_TIMELINE|CLAP_TRANSPORT_HAS_TIME_SIGNATURE))
            {
                const double ppqPos    = std::abs(transport->song_pos_beats);
                const int    ppqPerBar = transport->tsig_num * 4 / transport->tsig_denom;
                const double barBeats  = (std::fmod(ppqPos, ppqPerBar) / ppqPerBar) * transport->tsig_num;
                const double rest      =  std::fmod(barBeats, 1.0);

                fTimePosition.bbt.valid       = true;
                fTimePosition.bbt.bar         = static_cast<int32_t>(ppqPos) / ppqPerBar + 1;
                fTimePosition.bbt.beat        = static_cast<int32_t>(barBeats - rest + 0.5) + 1;
                fTimePosition.bbt.tick        = rest * fTimePosition.bbt.ticksPerBeat;
                fTimePosition.bbt.beatsPerBar = transport->tsig_num;
                fTimePosition.bbt.beatType    = transport->tsig_denom;

                if (transport->song_pos_beats < 0.0)
                {
                    --fTimePosition.bbt.bar;
                    fTimePosition.bbt.beat = transport->tsig_num - fTimePosition.bbt.beat + 1;
                    fTimePosition.bbt.tick = fTimePosition.bbt.ticksPerBeat - fTimePosition.bbt.tick - 1;
                }
            }
            else
            {
                fTimePosition.bbt.valid       = false;
                fTimePosition.bbt.bar         = 1;
                fTimePosition.bbt.beat        = 1;
                fTimePosition.bbt.tick        = 0.0;
                fTimePosition.bbt.beatsPerBar = 4.0f;
                fTimePosition.bbt.beatType    = 4.0f;
            }

            fTimePosition.bbt.barStartTick = fTimePosition.bbt.ticksPerBeat*
                                             fTimePosition.bbt.beatsPerBar*
                                             (fTimePosition.bbt.bar-1);
        }
        else
        {
            fTimePosition.playing = false;
            fTimePosition.frame = 0;
            fTimePosition.bbt.valid          = false;
            fTimePosition.bbt.beatsPerMinute = 120.0;
            fTimePosition.bbt.bar            = 1;
            fTimePosition.bbt.beat           = 1;
            fTimePosition.bbt.tick           = 0.0;
            fTimePosition.bbt.beatsPerBar    = 4.f;
            fTimePosition.bbt.beatType       = 4.f;
            fTimePosition.bbt.barStartTick   = 0;
        }

        fPlugin.setTimePosition(fTimePosition);
       #endif

        if (const clap_input_events_t* const inputEvents = process->in_events)
        {
            if (const uint32_t len = inputEvents->size(inputEvents))
            {
                for (uint32_t i=0; i<len; ++i)
                {
                    const clap_event_header_t* const event = inputEvents->get(inputEvents, i);

                    // event->time
                    switch (event->type)
                    {
                    case CLAP_EVENT_NOTE_ON:
                    case CLAP_EVENT_NOTE_OFF:
                    case CLAP_EVENT_NOTE_CHOKE:
                    case CLAP_EVENT_NOTE_END:
                    case CLAP_EVENT_NOTE_EXPRESSION:
                        break;
                    case CLAP_EVENT_PARAM_VALUE:
                        DISTRHO_SAFE_ASSERT_UINT2_BREAK(event->size == sizeof(clap_event_param_value),
                                                        event->size, sizeof(clap_event_param_value));
                        setParameterValueFromEvent(static_cast<const clap_event_param_value*>(static_cast<const void*>(event)));
                        break;
                    case CLAP_EVENT_PARAM_MOD:
                    case CLAP_EVENT_PARAM_GESTURE_BEGIN:
                    case CLAP_EVENT_PARAM_GESTURE_END:
                    case CLAP_EVENT_TRANSPORT:
                    case CLAP_EVENT_MIDI:
                    case CLAP_EVENT_MIDI_SYSEX:
                    case CLAP_EVENT_MIDI2:
                        break;
                    }
                }
            }
        }

        if (const uint32_t frames = process->frames_count)
        {
            // TODO multi-port bus stuff
            DISTRHO_SAFE_ASSERT_UINT_RETURN(process->audio_inputs_count == 0 || process->audio_inputs_count == 1,
                                            process->audio_inputs_count, false);
            DISTRHO_SAFE_ASSERT_UINT_RETURN(process->audio_outputs_count == 0 || process->audio_outputs_count == 1,
                                            process->audio_outputs_count, false);

            const float** inputs = process->audio_inputs != nullptr
                                 ? const_cast<const float**>(process->audio_inputs[0].data32)
                                 : nullptr;
            /**/ float** outputs = process->audio_outputs != nullptr
                                 ? process->audio_outputs[0].data32
                                 : nullptr;

            fOutputEvents = process->out_events;

           #if DISTRHO_PLUGIN_WANT_MIDI_INPUT
            fPlugin.run(inputs, outputs, frames, nullptr, 0);
           #else
            fPlugin.run(inputs, outputs, frames);
           #endif

            // TODO set last frame
            flushParameters(nullptr, process->out_events);

            fOutputEvents = nullptr;
        }

        return true;
    }

    // ----------------------------------------------------------------------------------------------------------------
    // parameters

    uint32_t getParameterCount() const
    {
        return fPlugin.getParameterCount();
    }

    bool getParameterInfo(const uint32_t index, clap_param_info_t* const info) const
    {
        const ParameterRanges& ranges(fPlugin.getParameterRanges(index));

        if (fPlugin.getParameterDesignation(index) == kParameterDesignationBypass)
        {
            info->flags = CLAP_PARAM_IS_STEPPED|CLAP_PARAM_IS_BYPASS|CLAP_PARAM_IS_AUTOMATABLE;
            std::strcpy(info->name, "Bypass");
            std::strcpy(info->module, "dpf_bypass");
        }
        else
        {
            const uint32_t hints = fPlugin.getParameterHints(index);
            const uint32_t groupId = fPlugin.getParameterGroupId(index);

            info->flags = 0;
            if (hints & kParameterIsOutput)
                info->flags |= CLAP_PARAM_IS_READONLY;
            else if (hints & kParameterIsAutomatable)
                info->flags |= CLAP_PARAM_IS_AUTOMATABLE;

            if (hints & (kParameterIsBoolean|kParameterIsInteger))
                info->flags |= CLAP_PARAM_IS_STEPPED;

            DISTRHO_NAMESPACE::strncpy(info->name, fPlugin.getParameterName(index), CLAP_NAME_SIZE);

            uint wrtn;
            if (groupId != kPortGroupNone)
            {
                const PortGroupWithId& portGroup(fPlugin.getPortGroupById(groupId));
                strncpy(info->module, portGroup.symbol, CLAP_PATH_SIZE / 2);
                info->module[CLAP_PATH_SIZE / 2] = '\0';
                wrtn = std::strlen(info->module);
                info->module[wrtn++] = '/';
            }
            else
            {
                wrtn = 0;
            }

            DISTRHO_NAMESPACE::strncpy(info->module + wrtn, fPlugin.getParameterSymbol(index), CLAP_PATH_SIZE - wrtn);
        }

        info->id = index;
        info->cookie = nullptr;
        info->min_value = ranges.min;
        info->max_value = ranges.max;
        info->default_value = ranges.def;
        return true;
    }

    bool getParameterValue(const clap_id param_id, double* const value) const
    {
        *value = fPlugin.getParameterValue(param_id);
        return true;
    }

    bool getParameterStringForValue(const clap_id param_id, double value, char* const display, const uint32_t size) const
    {
        const ParameterEnumerationValues& enumValues(fPlugin.getParameterEnumValues(param_id));
        const ParameterRanges& ranges(fPlugin.getParameterRanges(param_id));
        const uint32_t hints = fPlugin.getParameterHints(param_id);

        if (hints & kParameterIsBoolean)
        {
            const float midRange = ranges.min + (ranges.max - ranges.min) * 0.5f;
            value = value > midRange ? ranges.max : ranges.min;
        }
        else if (hints & kParameterIsInteger)
        {
            value = std::round(value);
        }

        for (uint32_t i=0; i < enumValues.count; ++i)
        {
            if (d_isEqual(static_cast<double>(enumValues.values[i].value), value))
            {
                DISTRHO_NAMESPACE::strncpy(display, enumValues.values[i].label, size);
                return true;
            }
        }

        if (hints & kParameterIsInteger)
            snprintf_i32(display, value, size);
        else
            snprintf_f32(display, value, size);

        return true;
    }

    bool getParameterValueForString(const clap_id param_id, const char* const display, double* const value) const
    {
        const ParameterEnumerationValues& enumValues(fPlugin.getParameterEnumValues(param_id));
        const bool isInteger = fPlugin.isParameterInteger(param_id);

        for (uint32_t i=0; i < enumValues.count; ++i)
        {
            if (std::strcmp(display, enumValues.values[i].label) == 0)
            {
                *value = enumValues.values[i].value;
                return true;
            }
        }

        if (isInteger)
            *value = std::atoi(display);
        else
            *value = std::atof(display);

        return true;
    }

    void setParameterValueFromEvent(const clap_event_param_value* const param)
    {
        fCachedParameters.values[param->param_id] = param->value;
        fCachedParameters.changed[param->param_id] = true;
        fPlugin.setParameterValue(param->param_id, param->value);
    }

    void flushParameters(const clap_input_events_t* const in, const clap_output_events_t* const out)
    {
        if (const uint32_t len = in != nullptr ? in->size(in) : 0)
        {
            for (uint32_t i=0; i<len; ++i)
            {
                const clap_event_header_t* const event = in->get(in, i);

                if (event->type != CLAP_EVENT_PARAM_VALUE)
                    continue;

                DISTRHO_SAFE_ASSERT_UINT2_BREAK(event->size == sizeof(clap_event_param_value),
                                                event->size, sizeof(clap_event_param_value));
                
                setParameterValueFromEvent(static_cast<const clap_event_param_value*>(static_cast<const void*>(event)));
            }
        }

        if (out != nullptr)
        {
            clap_event_param_value_t clapEvent = {
                { sizeof(clap_event_param_value_t), 0, 0, CLAP_EVENT_PARAM_VALUE, CLAP_EVENT_IS_LIVE },
                0, nullptr, 0, 0, 0, 0, 0.0
            };

            float value;
            for (uint i=0; i<fCachedParameters.numParams; ++i)
            {
                if (fPlugin.isParameterOutputOrTrigger(i))
                {
                    value = fPlugin.getParameterValue(i);

                    if (d_isEqual(fCachedParameters.values[i], value))
                        continue;

                    fCachedParameters.values[i] = value;
                    fCachedParameters.changed[i] = true;

                    clapEvent.param_id = i;
                    clapEvent.value = value;
                    out->try_push(out, &clapEvent.header);
                }
            }
        }
    }

    // ----------------------------------------------------------------------------------------------------------------
    // gui

   #if DISTRHO_PLUGIN_HAS_UI
    bool createUI(const bool isFloating)
    {
        fUI = new ClapUI(fPlugin, this, isFloating);
        return true;
    }

    void destroyUI()
    {
        fUI = nullptr;
    }

    ClapUI* getUI() const noexcept
    {
        return fUI.get();
    }
   #endif

   #if DISTRHO_PLUGIN_HAS_UI && DISTRHO_PLUGIN_WANT_STATE
    void setStateFromUI(const char* const key, const char* const value) override
    {
        fPlugin.setState(key, value);

        // TODO check if we want to save this key, and save it
    }
   #endif

    // ----------------------------------------------------------------------------------------------------------------

private:
    // Plugin and UI
    PluginExporter fPlugin;
   #if DISTRHO_PLUGIN_HAS_UI
    ScopedPointer<ClapUI> fUI;
   #endif

    // CLAP stuff
    const clap_host_t* const fHost;
    const clap_output_events_t* fOutputEvents;
   #if DISTRHO_PLUGIN_WANT_TIMEPOS
    TimePosition fTimePosition;
   #endif

    // ----------------------------------------------------------------------------------------------------------------
    // DPF callbacks

   #if DISTRHO_PLUGIN_WANT_MIDI_OUTPUT
    bool writeMidi(const MidiEvent&)
    {
        return true;
    }

    static bool writeMidiCallback(void* const ptr, const MidiEvent& midiEvent)
    {
        return static_cast<PluginCLAP*>(ptr)->writeMidi(midiEvent);
    }
   #endif

   #if DISTRHO_PLUGIN_WANT_PARAMETER_VALUE_CHANGE_REQUEST
    bool requestParameterValueChange(uint32_t, float)
    {
        return true;
    }

    static bool requestParameterValueChangeCallback(void* const ptr, const uint32_t index, const float value)
    {
        return static_cast<PluginCLAP*>(ptr)->requestParameterValueChange(index, value);
    }
   #endif

   #if DISTRHO_PLUGIN_WANT_STATE
    bool updateState(const char*, const char*)
    {
        return true;
    }

    static bool updateStateValueCallback(void* const ptr, const char* const key, const char* const value)
    {
        return static_cast<PluginCLAP*>(ptr)->updateState(key, value);
    }
   #endif
};

// --------------------------------------------------------------------------------------------------------------------

static ScopedPointer<PluginExporter> sPlugin;

// --------------------------------------------------------------------------------------------------------------------
// plugin gui

#if DISTRHO_PLUGIN_HAS_UI

static const char* const kSupportedAPIs[] = {
#if defined(DISTRHO_OS_WINDOWS)
    CLAP_WINDOW_API_WIN32,
#elif defined(DISTRHO_OS_MAC)
    CLAP_WINDOW_API_COCOA,
#else
    CLAP_WINDOW_API_X11,
#endif
};

// TODO DPF external UI
static bool clap_gui_is_api_supported(const clap_plugin_t*, const char* const api, bool)
{
    for (size_t i=0; i<ARRAY_SIZE(kSupportedAPIs); ++i)
    {
        if (std::strcmp(kSupportedAPIs[i], api) == 0)
            return true;
    }

    return false;
}

// TODO DPF external UI
static bool clap_gui_get_preferred_api(const clap_plugin_t*, const char** const api, bool* const is_floating)
{
    *api = kSupportedAPIs[0];
    *is_floating = false;
    return true;
}

static bool clap_gui_create(const clap_plugin_t* const plugin, const char* const api, const bool is_floating)
{
    for (size_t i=0; i<ARRAY_SIZE(kSupportedAPIs); ++i)
    {
        if (std::strcmp(kSupportedAPIs[i], api) == 0)
        {
            PluginCLAP* const instance = static_cast<PluginCLAP*>(plugin->plugin_data);
            return instance->createUI(is_floating);
        }
    }

    return false;
}

static void clap_gui_destroy(const clap_plugin_t* const plugin)
{
    PluginCLAP* const instance = static_cast<PluginCLAP*>(plugin->plugin_data);
    instance->destroyUI();
}

static bool clap_gui_set_scale(const clap_plugin_t* const plugin, const double scale)
{
    PluginCLAP* const instance = static_cast<PluginCLAP*>(plugin->plugin_data);
    ClapUI* const gui = instance->getUI();
    DISTRHO_SAFE_ASSERT_RETURN(gui != nullptr, false);
    return gui->setScaleFactor(scale);
}

static bool clap_gui_get_size(const clap_plugin_t* const plugin, uint32_t* const width, uint32_t* const height)
{
    PluginCLAP* const instance = static_cast<PluginCLAP*>(plugin->plugin_data);
    ClapUI* const gui = instance->getUI();
    DISTRHO_SAFE_ASSERT_RETURN(gui != nullptr, false);
    return gui->getSize(width, height);
}

static bool clap_gui_can_resize(const clap_plugin_t* const plugin)
{
    PluginCLAP* const instance = static_cast<PluginCLAP*>(plugin->plugin_data);
    ClapUI* const gui = instance->getUI();
    DISTRHO_SAFE_ASSERT_RETURN(gui != nullptr, false);
    return gui->canResize();
}

static bool clap_gui_get_resize_hints(const clap_plugin_t* const plugin, clap_gui_resize_hints_t* const hints)
{
    PluginCLAP* const instance = static_cast<PluginCLAP*>(plugin->plugin_data);
    ClapUI* const gui = instance->getUI();
    DISTRHO_SAFE_ASSERT_RETURN(gui != nullptr, false);
    return gui->getResizeHints(hints);
}

static bool clap_gui_adjust_size(const clap_plugin_t* const plugin, uint32_t* const width, uint32_t* const height)
{
    PluginCLAP* const instance = static_cast<PluginCLAP*>(plugin->plugin_data);
    ClapUI* const gui = instance->getUI();
    DISTRHO_SAFE_ASSERT_RETURN(gui != nullptr, false);
    return gui->adjustSize(width, height);
}

static bool clap_gui_set_size(const clap_plugin_t* const plugin, const uint32_t width, const uint32_t height)
{
    PluginCLAP* const instance = static_cast<PluginCLAP*>(plugin->plugin_data);
    ClapUI* const gui = instance->getUI();
    DISTRHO_SAFE_ASSERT_RETURN(gui != nullptr, false);
    return gui->setSizeFromHost(width, height);
}

static bool clap_gui_set_parent(const clap_plugin_t* const plugin, const clap_window_t* const window)
{
    PluginCLAP* const instance = static_cast<PluginCLAP*>(plugin->plugin_data);
    ClapUI* const gui = instance->getUI();
    DISTRHO_SAFE_ASSERT_RETURN(gui != nullptr, false);
    return gui->setParent(window);
}

static bool clap_gui_set_transient(const clap_plugin_t* const plugin, const clap_window_t* const window)
{
    PluginCLAP* const instance = static_cast<PluginCLAP*>(plugin->plugin_data);
    ClapUI* const gui = instance->getUI();
    DISTRHO_SAFE_ASSERT_RETURN(gui != nullptr, false);
    return gui->setTransient(window);
}

static void clap_gui_suggest_title(const clap_plugin_t* const plugin, const char* const title)
{
    PluginCLAP* const instance = static_cast<PluginCLAP*>(plugin->plugin_data);
    ClapUI* const gui = instance->getUI();
    DISTRHO_SAFE_ASSERT_RETURN(gui != nullptr,);
    return gui->suggestTitle(title);
}

static bool clap_gui_show(const clap_plugin_t* const plugin)
{
    PluginCLAP* const instance = static_cast<PluginCLAP*>(plugin->plugin_data);
    ClapUI* const gui = instance->getUI();
    DISTRHO_SAFE_ASSERT_RETURN(gui != nullptr, false);
    return gui->show();
}

static bool clap_gui_hide(const clap_plugin_t* const plugin)
{
    PluginCLAP* const instance = static_cast<PluginCLAP*>(plugin->plugin_data);
    ClapUI* const gui = instance->getUI();
    DISTRHO_SAFE_ASSERT_RETURN(gui != nullptr, false);
    return gui->hide();
}

static const clap_plugin_gui_t clap_plugin_gui = {
    clap_gui_is_api_supported,
    clap_gui_get_preferred_api,
    clap_gui_create,
    clap_gui_destroy,
    clap_gui_set_scale,
    clap_gui_get_size,
    clap_gui_can_resize,
    clap_gui_get_resize_hints,
    clap_gui_adjust_size,
    clap_gui_set_size,
    clap_gui_set_parent,
    clap_gui_set_transient,
    clap_gui_suggest_title,
    clap_gui_show,
    clap_gui_hide
};
#endif // DISTRHO_PLUGIN_HAS_UI

// --------------------------------------------------------------------------------------------------------------------
// plugin audio ports

static uint32_t clap_plugin_audio_ports_count(const clap_plugin_t*, const bool is_input)
{
    return (is_input ? DISTRHO_PLUGIN_NUM_INPUTS : DISTRHO_PLUGIN_NUM_OUTPUTS) != 0 ? 1 : 0;
}

static bool clap_plugin_audio_ports_get(const clap_plugin_t* /* const plugin */,
                                        const uint32_t index,
                                        const bool is_input,
                                        clap_audio_port_info_t* const info)
{
    const uint32_t maxPortCount = is_input ? DISTRHO_PLUGIN_NUM_INPUTS : DISTRHO_PLUGIN_NUM_OUTPUTS;
    DISTRHO_SAFE_ASSERT_UINT2_RETURN(index < maxPortCount, index, maxPortCount, false);

   #if DISTRHO_PLUGIN_NUM_INPUTS+DISTRHO_PLUGIN_NUM_OUTPUTS > 0
    // PluginCLAP* const instance = static_cast<PluginCLAP*>(plugin->plugin_data);

    // TODO use groups
    AudioPortWithBusId& audioPort(sPlugin->getAudioPort(is_input, index));

    info->id = index;
    DISTRHO_NAMESPACE::strncpy(info->name, audioPort.name, CLAP_NAME_SIZE);

    // TODO bus stuff
    info->flags = CLAP_AUDIO_PORT_IS_MAIN;
    info->channel_count = maxPortCount;

    // TODO CV
    // info->port_type = audioPort.hints & kAudioPortIsCV ? CLAP_PORT_CV : nullptr;
    info->port_type = nullptr;

    info->in_place_pair = DISTRHO_PLUGIN_NUM_INPUTS == DISTRHO_PLUGIN_NUM_OUTPUTS ? index : CLAP_INVALID_ID;

    return true;
   #else
    return false;
   #endif
}

static const clap_plugin_audio_ports_t clap_plugin_audio_ports = {
    clap_plugin_audio_ports_count,
    clap_plugin_audio_ports_get
};

// --------------------------------------------------------------------------------------------------------------------
// plugin parameters

static uint32_t clap_plugin_params_count(const clap_plugin_t* const plugin)
{
    PluginCLAP* const instance = static_cast<PluginCLAP*>(plugin->plugin_data);
    return instance->getParameterCount();
}

static bool clap_plugin_params_get_info(const clap_plugin_t* const plugin, const uint32_t index, clap_param_info_t* const info)
{
    PluginCLAP* const instance = static_cast<PluginCLAP*>(plugin->plugin_data);
    return instance->getParameterInfo(index, info);
}

static bool clap_plugin_params_get_value(const clap_plugin_t* const plugin, const clap_id param_id, double* const value)
{
    PluginCLAP* const instance = static_cast<PluginCLAP*>(plugin->plugin_data);
    return instance->getParameterValue(param_id, value);
}

static bool clap_plugin_params_value_to_text(const clap_plugin_t* plugin, const clap_id param_id, const double value, char* const display, const uint32_t size)
{
    PluginCLAP* const instance = static_cast<PluginCLAP*>(plugin->plugin_data);
    return instance->getParameterStringForValue(param_id, value, display, size);
}

static bool clap_plugin_params_text_to_value(const clap_plugin_t* plugin, const clap_id param_id, const char* const display, double* const value)
{
    PluginCLAP* const instance = static_cast<PluginCLAP*>(plugin->plugin_data);
    return instance->getParameterValueForString(param_id, display, value);
}

static void clap_plugin_params_flush(const clap_plugin_t* plugin, const clap_input_events_t* in, const clap_output_events_t* out)
{
    PluginCLAP* const instance = static_cast<PluginCLAP*>(plugin->plugin_data);
    return instance->flushParameters(in, out);
}

static const clap_plugin_params_t clap_plugin_params = {
    clap_plugin_params_count,
    clap_plugin_params_get_info,
    clap_plugin_params_get_value,
    clap_plugin_params_value_to_text,
    clap_plugin_params_text_to_value,
    clap_plugin_params_flush
};

// --------------------------------------------------------------------------------------------------------------------
// plugin

static bool clap_plugin_init(const clap_plugin_t* const plugin)
{
    PluginCLAP* const instance = static_cast<PluginCLAP*>(plugin->plugin_data);
    return instance->init();
}

static void clap_plugin_destroy(const clap_plugin_t* const plugin)
{
    delete static_cast<PluginCLAP*>(plugin->plugin_data);
    std::free(const_cast<clap_plugin_t*>(plugin));
}

static bool clap_plugin_activate(const clap_plugin_t* const plugin,
                                 const double sample_rate,
                                 uint32_t,
                                 const uint32_t max_frames_count)
{
    d_nextBufferSize = max_frames_count;
    d_nextSampleRate = sample_rate;

    PluginCLAP* const instance = static_cast<PluginCLAP*>(plugin->plugin_data);
    instance->activate(sample_rate, max_frames_count);
    return true;
}

static void clap_plugin_deactivate(const clap_plugin_t* const plugin)
{
    PluginCLAP* const instance = static_cast<PluginCLAP*>(plugin->plugin_data);
    instance->deactivate();
}

static bool clap_plugin_start_processing(const clap_plugin_t*)
{
    // nothing to do
    return true;
}

static void clap_plugin_stop_processing(const clap_plugin_t*)
{
    // nothing to do
}

static void clap_plugin_reset(const clap_plugin_t*)
{
    // nothing to do
}

static clap_process_status clap_plugin_process(const clap_plugin_t* const plugin, const clap_process_t* const process)
{
    PluginCLAP* const instance = static_cast<PluginCLAP*>(plugin->plugin_data);
    return instance->process(process) ? CLAP_PROCESS_CONTINUE : CLAP_PROCESS_ERROR;
}

static const void* clap_plugin_get_extension(const clap_plugin_t*, const char* const id)
{
    if (std::strcmp(id, CLAP_EXT_AUDIO_PORTS) == 0)
        return &clap_plugin_audio_ports;
    if (std::strcmp(id, CLAP_EXT_PARAMS) == 0)
        return &clap_plugin_params;
   #if DISTRHO_PLUGIN_HAS_UI
    if (std::strcmp(id, CLAP_EXT_GUI) == 0)
        return &clap_plugin_gui;
   #endif
    return nullptr;
}

static void clap_plugin_on_main_thread(const clap_plugin_t*)
{
    // nothing to do
}

// --------------------------------------------------------------------------------------------------------------------
// plugin factory

static uint32_t clap_get_plugin_count(const clap_plugin_factory_t*)
{
    return 1;
}

static const clap_plugin_descriptor_t* clap_get_plugin_descriptor(const clap_plugin_factory_t*, const uint32_t index)
{
    DISTRHO_SAFE_ASSERT_UINT_RETURN(index == 0, index, nullptr);

    static const char* features[] = {
       #ifdef DISTRHO_PLUGIN_CLAP_FEATURES
        DISTRHO_PLUGIN_CLAP_FEATURES,
       #elif DISTRHO_PLUGIN_IS_SYNTH
        "instrument",
       #endif
        nullptr
    };

    static const clap_plugin_descriptor_t descriptor = {
        CLAP_VERSION,
        sPlugin->getLabel(),
        sPlugin->getName(),
        sPlugin->getMaker(),
        // TODO url
        "",
        // TODO manual url
        "",
        // TODO support url
        "",
        // TODO version string
        "",
        sPlugin->getDescription(),
        features
    };

    return &descriptor;
}

static const clap_plugin_t* clap_create_plugin(const clap_plugin_factory_t* const factory,
                                               const clap_host_t* const host,
                                               const char*)
{
    clap_plugin_t* const pluginptr = static_cast<clap_plugin_t*>(std::malloc(sizeof(clap_plugin_t)));
    DISTRHO_SAFE_ASSERT_RETURN(pluginptr != nullptr, nullptr);

    // default early values
    if (d_nextBufferSize == 0)
        d_nextBufferSize = 1024;
    if (d_nextSampleRate <= 0.0)
        d_nextSampleRate = 44100.0;

    d_nextCanRequestParameterValueChanges = true;

    const clap_plugin_t plugin = {
        clap_get_plugin_descriptor(factory, 0),
        new PluginCLAP(host),
        clap_plugin_init,
        clap_plugin_destroy,
        clap_plugin_activate,
        clap_plugin_deactivate,
        clap_plugin_start_processing,
        clap_plugin_stop_processing,
        clap_plugin_reset,
        clap_plugin_process,
        clap_plugin_get_extension,
        clap_plugin_on_main_thread
    };

    std::memcpy(pluginptr, &plugin, sizeof(clap_plugin_t));
    return pluginptr;
}

static const clap_plugin_factory_t clap_plugin_factory = {
    clap_get_plugin_count,
    clap_get_plugin_descriptor,
    clap_create_plugin
};

// --------------------------------------------------------------------------------------------------------------------
// plugin entry

static bool clap_plugin_entry_init(const char* const plugin_path)
{
    static String bundlePath;
    bundlePath = plugin_path;
    d_nextBundlePath = bundlePath.buffer();

    // init dummy plugin
    if (sPlugin == nullptr)
    {
        // set valid but dummy values
        d_nextBufferSize = 512;
        d_nextSampleRate = 44100.0;
        d_nextPluginIsDummy = true;
        d_nextCanRequestParameterValueChanges = true;

        // Create dummy plugin to get data from
        sPlugin = new PluginExporter(nullptr, nullptr, nullptr, nullptr);

        // unset
        d_nextBufferSize = 0;
        d_nextSampleRate = 0.0;
        d_nextPluginIsDummy = false;
        d_nextCanRequestParameterValueChanges = false;
    }

    return true;
}

static void clap_plugin_entry_deinit(void)
{
    sPlugin = nullptr;
}

static const void* clap_plugin_entry_get_factory(const char* const factory_id)
{
    if (std::strcmp(factory_id, CLAP_PLUGIN_FACTORY_ID) == 0)
        return &clap_plugin_factory;
    return nullptr;
}

static const clap_plugin_entry_t clap_plugin_entry = {
    CLAP_VERSION,
    clap_plugin_entry_init,
    clap_plugin_entry_deinit,
    clap_plugin_entry_get_factory
};

// --------------------------------------------------------------------------------------------------------------------

END_NAMESPACE_DISTRHO

// --------------------------------------------------------------------------------------------------------------------

DISTRHO_PLUGIN_EXPORT
const clap_plugin_entry_t clap_entry = DISTRHO_NAMESPACE::clap_plugin_entry;

// --------------------------------------------------------------------------------------------------------------------