/*
 * DISTRHO Plugin Framework (DPF)
 * Copyright (C) 2012-2016 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 "DistrhoUIInternal.hpp"

#include "../extra/String.hpp"

#include "lv2/atom.h"
#include "lv2/atom-util.h"
#include "lv2/data-access.h"
#include "lv2/instance-access.h"
#include "lv2/midi.h"
#include "lv2/options.h"
#include "lv2/parameters.h"
#include "lv2/ui.h"
#include "lv2/urid.h"
#include "lv2/lv2_kxstudio_properties.h"
#include "lv2/lv2_programs.h"

#ifndef DISTRHO_PLUGIN_LV2_STATE_PREFIX
# define DISTRHO_PLUGIN_LV2_STATE_PREFIX "urn:distrho:"
#endif

START_NAMESPACE_DISTRHO

typedef struct _LV2_Atom_MidiEvent {
    LV2_Atom atom;    /**< Atom header. */
    uint8_t  data[3]; /**< MIDI data (body). */
} LV2_Atom_MidiEvent;

#if ! DISTRHO_PLUGIN_WANT_MIDI_INPUT
static const sendNoteFunc sendNoteCallback = nullptr;
#endif

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

class UiLv2
{
public:
    UiLv2(const char* const bundlePath, const intptr_t winId,
          const LV2_Options_Option* options, const LV2_URID_Map* const uridMap, const LV2UI_Resize* const uiResz, const LV2UI_Touch* uiTouch,
          const LV2UI_Controller controller, const LV2UI_Write_Function writeFunc,
          LV2UI_Widget* const widget, void* const dspPtr)
        : fUI(this, winId, editParameterCallback, setParameterCallback, setStateCallback, sendNoteCallback, setSizeCallback, dspPtr, bundlePath),
          fUridMap(uridMap),
          fUiResize(uiResz),
          fUiTouch(uiTouch),
          fController(controller),
          fWriteFunction(writeFunc),
          fEventTransferURID(uridMap->map(uridMap->handle, LV2_ATOM__eventTransfer)),
          fMidiEventURID(uridMap->map(uridMap->handle, LV2_MIDI__MidiEvent)),
          fKeyValueURID(uridMap->map(uridMap->handle, DISTRHO_PLUGIN_LV2_STATE_PREFIX "KeyValueState")),
          fWinIdWasNull(winId == 0)
    {
        if (fUiResize != nullptr && winId != 0)
            fUiResize->ui_resize(fUiResize->handle, fUI.getWidth(), fUI.getHeight());

        if (widget != nullptr)
            *widget = (LV2UI_Widget)fUI.getWindowId();

#if DISTRHO_PLUGIN_WANT_STATE
        // tell the DSP we're ready to receive msgs
        setState("__dpf_ui_data__", "");
#endif

        if (winId != 0)
            return;

        // if winId == 0 then options must not be null
        DISTRHO_SAFE_ASSERT_RETURN(options != nullptr,);

        const LV2_URID uridWindowTitle(uridMap->map(uridMap->handle, LV2_UI__windowTitle));
        const LV2_URID uridTransientWinId(uridMap->map(uridMap->handle, LV2_KXSTUDIO_PROPERTIES__TransientWindowId));

        bool hasTitle = false;

        for (int i=0; options[i].key != 0; ++i)
        {
            if (options[i].key == uridTransientWinId)
            {
                if (options[i].type == uridMap->map(uridMap->handle, LV2_ATOM__Long))
                {
                    if (const int64_t transientWinId = *(const int64_t*)options[i].value)
                        fUI.setWindowTransientWinId(static_cast<intptr_t>(transientWinId));
                }
                else
                    d_stderr("Host provides transientWinId but has wrong value type");
            }
            else if (options[i].key == uridWindowTitle)
            {
                if (options[i].type == uridMap->map(uridMap->handle, LV2_ATOM__String))
                {
                    if (const char* const windowTitle = (const char*)options[i].value)
                    {
                        hasTitle = true;
                        fUI.setWindowTitle(windowTitle);
                    }
                }
                else
                    d_stderr("Host provides windowTitle but has wrong value type");
            }
        }

        if (! hasTitle)
            fUI.setWindowTitle(DISTRHO_PLUGIN_NAME);
    }

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

    void lv2ui_port_event(const uint32_t rindex, const uint32_t bufferSize, const uint32_t format, const void* const buffer)
    {
        if (format == 0)
        {
            const uint32_t parameterOffset(fUI.getParameterOffset());

            if (rindex < parameterOffset)
                return;

            DISTRHO_SAFE_ASSERT_RETURN(bufferSize == sizeof(float),)

            const float value(*(const float*)buffer);
            fUI.parameterChanged(rindex-parameterOffset, value);
        }
#if DISTRHO_PLUGIN_WANT_STATE
        else if (format == fEventTransferURID)
        {
            const LV2_Atom* const atom((const LV2_Atom*)buffer);

            DISTRHO_SAFE_ASSERT_RETURN(atom->type == fKeyValueURID,);

            const char* const key   = (const char*)LV2_ATOM_BODY_CONST(atom);
            const char* const value = key+(std::strlen(key)+1);

            fUI.stateChanged(key, value);
        }
#endif
    }

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

    int lv2ui_idle()
    {
        if (fWinIdWasNull)
            return (fUI.idle() && fUI.isVisible()) ? 0 : 1;

        return fUI.idle() ? 0 : 1;
    }

    int lv2ui_show()
    {
        return fUI.setWindowVisible(true) ? 0 : 1;
    }

    int lv2ui_hide()
    {
        return fUI.setWindowVisible(false) ? 0 : 1;
    }

    int lv2ui_resize(uint width, uint height)
    {
        fUI.setWindowSize(width, height, true);
        return 0;
    }

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

    uint32_t lv2_get_options(LV2_Options_Option* const /*options*/)
    {
        // currently unused
        return LV2_OPTIONS_ERR_UNKNOWN;
    }

    uint32_t lv2_set_options(const LV2_Options_Option* const options)
    {
        for (int i=0; options[i].key != 0; ++i)
        {
            if (options[i].key == fUridMap->map(fUridMap->handle, LV2_PARAMETERS__sampleRate))
            {
                if (options[i].type == fUridMap->map(fUridMap->handle, LV2_ATOM__Float))
                {
                    const float sampleRate(*(const float*)options[i].value);
                    fUI.setSampleRate(sampleRate);
                    continue;
                }
                else
                {
                    d_stderr("Host changed UI sample-rate but with wrong value type");
                    continue;
                }
            }
        }

        return LV2_OPTIONS_SUCCESS;
    }

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

#if DISTRHO_PLUGIN_WANT_PROGRAMS
    void lv2ui_select_program(const uint32_t bank, const uint32_t program)
    {
        const uint32_t realProgram(bank * 128 + program);

        fUI.programLoaded(realProgram);
    }
#endif

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

protected:
    void editParameterValue(const uint32_t rindex, const bool started)
    {
        if (fUiTouch != nullptr && fUiTouch->touch != nullptr)
            fUiTouch->touch(fUiTouch->handle, rindex, started);
    }

    void setParameterValue(const uint32_t rindex, const float value)
    {
        DISTRHO_SAFE_ASSERT_RETURN(fWriteFunction != nullptr,);

        fWriteFunction(fController, rindex, sizeof(float), 0, &value);
    }

    void setState(const char* const key, const char* const value)
    {
        DISTRHO_SAFE_ASSERT_RETURN(fWriteFunction != nullptr,);

        const uint32_t eventInPortIndex(DISTRHO_PLUGIN_NUM_INPUTS + DISTRHO_PLUGIN_NUM_OUTPUTS);

        // join key and value
        String tmpStr;
        tmpStr += key;
        tmpStr += "\xff";
        tmpStr += value;

        tmpStr[std::strlen(key)] = '\0';

        // set msg size (key + separator + value + null terminator)
        const size_t msgSize(tmpStr.length()+1);

        // reserve atom space
        const size_t atomSize(sizeof(LV2_Atom) + msgSize);
        char         atomBuf[atomSize];
        std::memset(atomBuf, 0, atomSize);

        // set atom info
        LV2_Atom* const atom((LV2_Atom*)atomBuf);
        atom->size = msgSize;
        atom->type = fKeyValueURID;

        // set atom data
        std::memcpy(atomBuf + sizeof(LV2_Atom), tmpStr.buffer(), msgSize);

        // send to DSP side
        fWriteFunction(fController, eventInPortIndex, atomSize, fEventTransferURID, atom);
    }

#if DISTRHO_PLUGIN_WANT_MIDI_INPUT
    void sendNote(const uint8_t channel, const uint8_t note, const uint8_t velocity)
    {
        DISTRHO_SAFE_ASSERT_RETURN(fWriteFunction != nullptr,);

        if (channel > 0xF)
            return;

        const uint32_t eventInPortIndex(DISTRHO_PLUGIN_NUM_INPUTS + DISTRHO_PLUGIN_NUM_OUTPUTS);

        LV2_Atom_MidiEvent atomMidiEvent;
        atomMidiEvent.atom.size = 3;
        atomMidiEvent.atom.type = fMidiEventURID;

        atomMidiEvent.data[0] = channel + (velocity != 0 ? 0x90 : 0x80);
        atomMidiEvent.data[1] = note;
        atomMidiEvent.data[2] = velocity;

        // send to DSP side
        fWriteFunction(fController, eventInPortIndex, sizeof(LV2_Atom_MidiEvent), fEventTransferURID, &atomMidiEvent);
    }
#endif

    void setSize(const uint width, const uint height)
    {
        fUI.setWindowSize(width, height);

        if (fUiResize != nullptr && ! fWinIdWasNull)
            fUiResize->ui_resize(fUiResize->handle, width, height);
    }

private:
    UIExporter fUI;

    // LV2 features
    const LV2_URID_Map* const fUridMap;
    const LV2UI_Resize* const fUiResize;
    const LV2UI_Touch*  const fUiTouch;

    // LV2 UI stuff
    const LV2UI_Controller     fController;
    const LV2UI_Write_Function fWriteFunction;

    // Need to save this
    const LV2_URID fEventTransferURID;
    const LV2_URID fMidiEventURID;
    const LV2_URID fKeyValueURID;

    // using ui:showInterface if true
    bool fWinIdWasNull;

    // -------------------------------------------------------------------
    // Callbacks

    #define uiPtr ((UiLv2*)ptr)

    static void editParameterCallback(void* ptr, uint32_t rindex, bool started)
    {
        uiPtr->editParameterValue(rindex, started);
    }

    static void setParameterCallback(void* ptr, uint32_t rindex, float value)
    {
        uiPtr->setParameterValue(rindex, value);
    }

    static void setStateCallback(void* ptr, const char* key, const char* value)
    {
        uiPtr->setState(key, value);
    }

#if DISTRHO_PLUGIN_WANT_MIDI_INPUT
    static void sendNoteCallback(void* ptr, uint8_t channel, uint8_t note, uint8_t velocity)
    {
        uiPtr->sendNote(channel, note, velocity);
    }
#endif

    static void setSizeCallback(void* ptr, uint width, uint height)
    {
        uiPtr->setSize(width, height);
    }

    #undef uiPtr
};

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

static LV2UI_Handle lv2ui_instantiate(const LV2UI_Descriptor*, const char* uri, const char* bundlePath,
                                      LV2UI_Write_Function writeFunction, LV2UI_Controller controller, LV2UI_Widget* widget, const LV2_Feature* const* features)
{
    if (uri == nullptr || std::strcmp(uri, DISTRHO_PLUGIN_URI) != 0)
    {
        d_stderr("Invalid plugin URI");
        return nullptr;
    }

    const LV2_Options_Option* options = nullptr;
    const LV2_URID_Map*       uridMap = nullptr;
    const LV2UI_Resize*      uiResize = nullptr;
    const LV2UI_Touch*       uiTouch  = nullptr;
    void*                    parentId = nullptr;
    void*                    instance = nullptr;

#if DISTRHO_PLUGIN_WANT_DIRECT_ACCESS
    struct LV2_DirectAccess_Interface {
        void* (*get_instance_pointer)(LV2_Handle handle);
    };
    const LV2_Extension_Data_Feature* extData = nullptr;
#endif

    for (int i=0; features[i] != nullptr; ++i)
    {
        if (std::strcmp(features[i]->URI, LV2_OPTIONS__options) == 0)
            options = (const LV2_Options_Option*)features[i]->data;
        else if (std::strcmp(features[i]->URI, LV2_URID__map) == 0)
            uridMap = (const LV2_URID_Map*)features[i]->data;
        else if (std::strcmp(features[i]->URI, LV2_UI__resize) == 0)
            uiResize = (const LV2UI_Resize*)features[i]->data;
        else if (std::strcmp(features[i]->URI, LV2_UI__parent) == 0)
            parentId = features[i]->data;
#if DISTRHO_PLUGIN_WANT_DIRECT_ACCESS
        else if (std::strcmp(features[i]->URI, LV2_DATA_ACCESS_URI) == 0)
            extData = (const LV2_Extension_Data_Feature*)features[i]->data;
        else if (std::strcmp(features[i]->URI, LV2_INSTANCE_ACCESS_URI) == 0)
            instance = features[i]->data;
#endif
    }

    if (options == nullptr && parentId == nullptr)
    {
        d_stderr("Options feature missing (needed for show-interface), cannot continue!");
        return nullptr;
    }

    if (uridMap == nullptr)
    {
        d_stderr("URID Map feature missing, cannot continue!");
        return nullptr;
    }

    if (parentId == nullptr)
    {
        d_stdout("Parent Window Id missing, host should be using ui:showInterface...");
    }

#if DISTRHO_PLUGIN_WANT_DIRECT_ACCESS
    if (extData == nullptr || instance == nullptr)
    {
        d_stderr("Data or instance access missing, cannot continue!");
        return nullptr;
    }

    if (const LV2_DirectAccess_Interface* const directAccess = (const LV2_DirectAccess_Interface*)extData->data_access(DISTRHO_PLUGIN_LV2_STATE_PREFIX "direct-access"))
        instance = directAccess->get_instance_pointer(instance);
    else
        instance = nullptr;

    if (instance == nullptr)
    {
        d_stderr("Failed to get direct access, cannot continue!");
        return nullptr;
    }
#endif

    const intptr_t winId((intptr_t)parentId);

    if (options != nullptr)
    {
        const LV2_URID uridSampleRate(uridMap->map(uridMap->handle, LV2_PARAMETERS__sampleRate));

        for (int i=0; options[i].key != 0; ++i)
        {
            if (options[i].key == uridSampleRate)
            {
                if (options[i].type == uridMap->map(uridMap->handle, LV2_ATOM__Float))
                    d_lastUiSampleRate = *(const float*)options[i].value;
                else
                    d_stderr("Host provides UI sample-rate but has wrong value type");

                break;
            }
        }
    }

    if (d_lastUiSampleRate < 1.0)
    {
        d_stdout("WARNING: this host does not send sample-rate information for LV2 UIs, using 44100 as fallback (this could be wrong)");
        d_lastUiSampleRate = 44100.0;
    }

    return new UiLv2(bundlePath, winId, options, uridMap, uiResize, uiTouch, controller, writeFunction, widget, instance);
}

#define uiPtr ((UiLv2*)ui)

static void lv2ui_cleanup(LV2UI_Handle ui)
{
    delete uiPtr;
}

static void lv2ui_port_event(LV2UI_Handle ui, uint32_t portIndex, uint32_t bufferSize, uint32_t format, const void* buffer)
{
    uiPtr->lv2ui_port_event(portIndex, bufferSize, format, buffer);
}

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

static int lv2ui_idle(LV2UI_Handle ui)
{
    return uiPtr->lv2ui_idle();
}

static int lv2ui_show(LV2UI_Handle ui)
{
    return uiPtr->lv2ui_show();
}

static int lv2ui_hide(LV2UI_Handle ui)
{
    return uiPtr->lv2ui_hide();
}

static int lv2ui_resize(LV2UI_Handle ui, int width, int height)
{
    DISTRHO_SAFE_ASSERT_RETURN(ui != nullptr, 1);
    DISTRHO_SAFE_ASSERT_RETURN(width > 0, 1);
    DISTRHO_SAFE_ASSERT_RETURN(height > 0, 1);

    return 1; // This needs more testing
    //return uiPtr->lv2ui_resize(width, height);
}

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

static uint32_t lv2_get_options(LV2UI_Handle ui, LV2_Options_Option* options)
{
    return uiPtr->lv2_get_options(options);
}

static uint32_t lv2_set_options(LV2UI_Handle ui, const LV2_Options_Option* options)
{
    return uiPtr->lv2_set_options(options);
}

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

#if DISTRHO_PLUGIN_WANT_PROGRAMS
static void lv2ui_select_program(LV2UI_Handle ui, uint32_t bank, uint32_t program)
{
    uiPtr->lv2ui_select_program(bank, program);
}
#endif

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

static const void* lv2ui_extension_data(const char* uri)
{
    static const LV2_Options_Interface options = { lv2_get_options, lv2_set_options };
    static const LV2UI_Idle_Interface  uiIdle  = { lv2ui_idle };
    static const LV2UI_Show_Interface  uiShow  = { lv2ui_show, lv2ui_hide };
    static const LV2UI_Resize          uiResz  = { nullptr, lv2ui_resize };

    if (std::strcmp(uri, LV2_OPTIONS__interface) == 0)
        return &options;
    if (std::strcmp(uri, LV2_UI__idleInterface) == 0)
        return &uiIdle;
    if (std::strcmp(uri, LV2_UI__showInterface) == 0)
        return &uiShow;
    if (std::strcmp(uri, LV2_UI__resize) == 0)
        return &uiResz;

#if DISTRHO_PLUGIN_WANT_PROGRAMS
    static const LV2_Programs_UI_Interface uiPrograms = { lv2ui_select_program };

    if (std::strcmp(uri, LV2_PROGRAMS__UIInterface) == 0)
        return &uiPrograms;
#endif

    return nullptr;
}

#undef instancePtr

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

static const LV2UI_Descriptor sLv2UiDescriptor = {
    DISTRHO_UI_URI,
    lv2ui_instantiate,
    lv2ui_cleanup,
    lv2ui_port_event,
    lv2ui_extension_data
};

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

END_NAMESPACE_DISTRHO

DISTRHO_PLUGIN_EXPORT
const LV2UI_Descriptor* lv2ui_descriptor(uint32_t index)
{
    USE_NAMESPACE_DISTRHO
    return (index == 0) ? &sLv2UiDescriptor : nullptr;
}

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