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

   This file is part of the JUCE framework examples.
   Copyright (c) Raw Material Software Limited

   The code included in this file is provided under the terms of the ISC license
   http://www.isc.org/downloads/software-support-policy/isc-license. 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.

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

/*******************************************************************************
 The block below describes the properties of this PIP. A PIP is a short snippet
 of code that can be read by the Projucer and used to generate a JUCE project.

 BEGIN_JUCE_PIP_METADATA

 name:                  MIDILogger
 version:               1.0.0
 vendor:                JUCE
 website:               http://juce.com
 description:           Logs incoming MIDI messages.

 dependencies:          juce_audio_basics, juce_audio_devices, juce_audio_formats,
                        juce_audio_plugin_client, juce_audio_processors,
                        juce_audio_utils, juce_core, juce_data_structures,
                        juce_events, juce_graphics, juce_gui_basics, juce_gui_extra,
                        juce_audio_processors_headless
 exporters:             xcode_mac, vs2022, vs2026, linux_make

 moduleFlags:           JUCE_STRICT_REFCOUNTEDPOINTER=1

 type:                  AudioProcessor
 mainClass:             MidiLoggerPluginDemoProcessor

 useLocalCopy:          1

 pluginCharacteristics: pluginWantsMidiIn, pluginProducesMidiOut, pluginIsMidiEffectPlugin

 END_JUCE_PIP_METADATA

*******************************************************************************/

#pragma once

#include <iterator>

class MidiQueue
{
public:
    void push (const MidiBuffer& buffer)
    {
        for (const auto metadata : buffer)
            fifo.write (1).forEach ([&] (int dest) { messages[(size_t) dest] = metadata.getMessage(); });
    }

    template <typename OutputIt>
    void pop (OutputIt out)
    {
        fifo.read (fifo.getNumReady()).forEach ([&] (int source) { *out++ = messages[(size_t) source]; });
    }

private:
    static constexpr auto queueSize = 1 << 14;
    AbstractFifo fifo { queueSize };
    std::vector<MidiMessage> messages = std::vector<MidiMessage> (queueSize);
};

// Stores the last N messages. Safe to access from the message thread only.
class MidiListModel
{
public:
    template <typename It>
    void addMessages (It begin, It end)
    {
        if (begin == end)
            return;

        const auto numNewMessages = (int) std::distance (begin, end);
        const auto numToAdd = juce::jmin (numToStore, numNewMessages);
        const auto numToRemove = jmax (0, (int) messages.size() + numToAdd - numToStore);
        messages.erase (messages.begin(), std::next (messages.begin(), numToRemove));
        messages.insert (messages.end(), std::prev (end, numToAdd), end);

        NullCheckedInvocation::invoke (onChange);
    }

    void clear()
    {
        messages.clear();

        NullCheckedInvocation::invoke (onChange);
    }

    const MidiMessage& operator[] (size_t ind) const     { return messages[ind]; }

    size_t size() const                                  { return messages.size(); }

    std::function<void()> onChange;

private:
    static constexpr auto numToStore = 1000;
    std::vector<MidiMessage> messages;
};

//==============================================================================
class MidiTable final : public Component,
                        private TableListBoxModel
{
public:
    MidiTable (MidiListModel& m)
        : messages (m)
    {
        addAndMakeVisible (table);

        table.setModel (this);
        table.setClickingTogglesRowSelection (false);
        table.setHeader ([&]
        {
            auto header = std::make_unique<TableHeaderComponent>();
            header->addColumn ("Message", messageColumn, 200, 30, -1, TableHeaderComponent::notSortable);
            header->addColumn ("Time",    timeColumn,    100, 30, -1, TableHeaderComponent::notSortable);
            header->addColumn ("Channel", channelColumn, 100, 30, -1, TableHeaderComponent::notSortable);
            header->addColumn ("Data",    dataColumn,    200, 30, -1, TableHeaderComponent::notSortable);
            return header;
        }());

        messages.onChange = [&] { table.updateContent(); };
    }

    ~MidiTable() override { messages.onChange = nullptr; }

    void resized() override { table.setBounds (getLocalBounds()); }

private:
    enum
    {
        messageColumn = 1,
        timeColumn,
        channelColumn,
        dataColumn
    };

    int getNumRows() override          { return (int) messages.size(); }

    void paintRowBackground (Graphics&, int, int, int, bool) override {}
    void paintCell (Graphics&, int, int, int, int, bool)     override {}

    Component* refreshComponentForCell (int rowNumber,
                                        int columnId,
                                        bool,
                                        Component* existingComponentToUpdate) override
    {
        delete existingComponentToUpdate;

        const auto index = (int) messages.size() - 1 - rowNumber;
        const auto message = messages[(size_t) index];

        return new Label ({}, [&]
        {
            switch (columnId)
            {
                case messageColumn: return getEventString (message);
                case timeColumn:    return String (message.getTimeStamp());
                case channelColumn: return String (message.getChannel());
                case dataColumn:    return getDataString (message);
                default:            break;
            }

            jassertfalse;
            return String();
        }());
    }

    static String getEventString (const MidiMessage& m)
    {
        if (m.isNoteOn())           return "Note on";
        if (m.isNoteOff())          return "Note off";
        if (m.isProgramChange())    return "Program change";
        if (m.isPitchWheel())       return "Pitch wheel";
        if (m.isAftertouch())       return "Aftertouch";
        if (m.isChannelPressure())  return "Channel pressure";
        if (m.isAllNotesOff())      return "All notes off";
        if (m.isAllSoundOff())      return "All sound off";
        if (m.isMetaEvent())        return "Meta event";

        if (m.isController())
        {
            const auto* name = MidiMessage::getControllerName (m.getControllerNumber());
            return "Controller " + (name == nullptr ? String (m.getControllerNumber()) : String (name));
        }

        return String::toHexString (m.getRawData(), m.getRawDataSize());
    }

    static String getDataString (const MidiMessage& m)
    {
        if (m.isNoteOn())           return MidiMessage::getMidiNoteName (m.getNoteNumber(), true, true, 3) + " Velocity " + String (m.getVelocity());
        if (m.isNoteOff())          return MidiMessage::getMidiNoteName (m.getNoteNumber(), true, true, 3) + " Velocity " + String (m.getVelocity());
        if (m.isProgramChange())    return String (m.getProgramChangeNumber());
        if (m.isPitchWheel())       return String (m.getPitchWheelValue());
        if (m.isAftertouch())       return MidiMessage::getMidiNoteName (m.getNoteNumber(), true, true, 3) +  ": " + String (m.getAfterTouchValue());
        if (m.isChannelPressure())  return String (m.getChannelPressureValue());
        if (m.isController())       return String (m.getControllerValue());

        return {};
    }

    MidiListModel& messages;
    TableListBox table;
};

//==============================================================================
class MidiLoggerPluginDemoProcessor final : public AudioProcessor,
                                            private Timer
{
public:
    MidiLoggerPluginDemoProcessor()
        : AudioProcessor (getBusesLayout())
    {
        state.addChild ({ "uiState", { { "width",  600 }, { "height", 300 } }, {} }, -1, nullptr);
        startTimerHz (60);
    }

    ~MidiLoggerPluginDemoProcessor() override { stopTimer(); }

    void processBlock (AudioBuffer<float>& audio,  MidiBuffer& midi) override { process (audio, midi); }
    void processBlock (AudioBuffer<double>& audio, MidiBuffer& midi) override { process (audio, midi); }

    bool isBusesLayoutSupported (const BusesLayout&) const override           { return true; }
    bool isMidiEffect() const override                                        { return true; }
    bool hasEditor() const override                                           { return true; }
    AudioProcessorEditor* createEditor() override                             { return new Editor (*this); }

    const String getName() const override                                     { return "MIDI Logger"; }
    bool acceptsMidi() const override                                         { return true; }
    bool producesMidi() const override                                        { return true; }
    double getTailLengthSeconds() const override                              { return 0.0; }

    int getNumPrograms() override                                             { return 0; }
    int getCurrentProgram() override                                          { return 0; }
    void setCurrentProgram (int) override                                     {}
    const String getProgramName (int) override                                { return "None"; }
    void changeProgramName (int, const String&) override                      {}

    void prepareToPlay (double, int) override                                 {}
    void releaseResources() override                                          {}

    void getStateInformation (MemoryBlock& destData) override
    {
        if (auto xmlState = state.createXml())
            copyXmlToBinary (*xmlState, destData);
    }

    void setStateInformation (const void* data, int size) override
    {
        if (auto xmlState = getXmlFromBinary (data, size))
            state = ValueTree::fromXml (*xmlState);
    }

private:
    class Editor final : public AudioProcessorEditor,
                         private Value::Listener
    {
    public:
        explicit Editor (MidiLoggerPluginDemoProcessor& ownerIn)
            : AudioProcessorEditor (ownerIn),
              owner (ownerIn),
              table (owner.model)
        {
            addAndMakeVisible (table);
            addAndMakeVisible (clearButton);

            setResizable (true, true);
            lastUIWidth .referTo (owner.state.getChildWithName ("uiState").getPropertyAsValue ("width",  nullptr));
            lastUIHeight.referTo (owner.state.getChildWithName ("uiState").getPropertyAsValue ("height", nullptr));
            setSize (lastUIWidth.getValue(), lastUIHeight.getValue());

            lastUIWidth. addListener (this);
            lastUIHeight.addListener (this);

            clearButton.onClick = [&] { owner.model.clear(); };
        }

        void paint (Graphics& g) override
        {
            g.fillAll (getLookAndFeel().findColour (ResizableWindow::backgroundColourId));
        }

        void resized() override
        {
            auto bounds = getLocalBounds();

            clearButton.setBounds (bounds.removeFromBottom (30).withSizeKeepingCentre (50, 24));
            table.setBounds (bounds);

            lastUIWidth  = getWidth();
            lastUIHeight = getHeight();
        }

    private:
        void valueChanged (Value&) override
        {
            setSize (lastUIWidth.getValue(), lastUIHeight.getValue());
        }

        MidiLoggerPluginDemoProcessor& owner;

        MidiTable table;
        TextButton clearButton { "Clear" };

        Value lastUIWidth, lastUIHeight;
    };

    void timerCallback() override
    {
        std::vector<MidiMessage> messages;
        queue.pop (std::back_inserter (messages));
        model.addMessages (messages.begin(), messages.end());
    }

    template <typename Element>
    void process (AudioBuffer<Element>& audio, MidiBuffer& midi)
    {
        audio.clear();
        queue.push (midi);
    }

    static BusesProperties getBusesLayout()
    {
        // Live and Cakewalk don't like to load midi-only plugins, so we add an audio output there.
        const PluginHostType host;
        return host.isAbletonLive() || host.isSonar()
             ? BusesProperties().withOutput ("out", AudioChannelSet::stereo())
             : BusesProperties();
    }

    ValueTree state { "state" };
    MidiQueue queue;
    MidiListModel model; // The data to show in the UI. We keep it around in the processor so that
                         // the view is persistent even when the plugin UI is closed and reopened.

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (MidiLoggerPluginDemoProcessor)
};
