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

   This file is part of the JUCE 6 technical preview.
   Copyright (c) 2020 - Raw Material Software Limited

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

   For this technical preview, this file is not subject to commercial licensing.

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

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

#include <JuceHeader.h>
#include "../UI/GraphEditorPanel.h"
#include "InternalPlugins.h"
#include "../UI/MainHostWindow.h"
#include "IOConfigurationWindow.h"


//==============================================================================
struct NumberedBoxes  : public TableListBox,
                        private TableListBoxModel,
                        private Button::Listener
{
    struct Listener
    {
        virtual ~Listener() {}

        virtual void addColumn()    = 0;
        virtual void removeColumn() = 0;
        virtual void columnSelected (int columnId) = 0;
    };

    enum
    {
        plusButtonColumnId  = 128,
        minusButtonColumnId = 129
    };

    //==============================================================================
    NumberedBoxes (Listener& listenerToUse, bool canCurrentlyAddColumn, bool canCurrentlyRemoveColumn)
        : TableListBox ("NumberedBoxes", this),
          listener (listenerToUse),
          canAddColumn (canCurrentlyAddColumn),
          canRemoveColumn (canCurrentlyRemoveColumn)
    {
        auto& tableHeader = getHeader();

        for (int i = 0; i < 16; ++i)
            tableHeader.addColumn (String (i + 1), i + 1, 40);

        setHeaderHeight (0);
        setRowHeight (40);
        getHorizontalScrollBar().setAutoHide (false);
    }

    void setSelected (int columnId)
    {
        if (auto* button = dynamic_cast<TextButton*> (getCellComponent (columnId, 0)))
            button->setToggleState (true, NotificationType::dontSendNotification);
    }

    void setCanAddColumn (bool canCurrentlyAdd)
    {
        if (canCurrentlyAdd != canAddColumn)
        {
            canAddColumn = canCurrentlyAdd;

            if (auto* button = dynamic_cast<TextButton*> (getCellComponent (plusButtonColumnId, 0)))
                button->setEnabled (true);
        }
    }

    void setCanRemoveColumn (bool canCurrentlyRemove)
    {
        if (canCurrentlyRemove != canRemoveColumn)
        {
            canRemoveColumn = canCurrentlyRemove;

            if (auto* button = dynamic_cast<TextButton*> (getCellComponent (minusButtonColumnId, 0)))
                button->setEnabled (true);
        }
    }

private:
    //==============================================================================
    Listener& listener;
    bool canAddColumn, canRemoveColumn;

    //==============================================================================
    int getNumRows() override                                             { return 1; }
    void paintCell (Graphics&, int, int, int, int, bool) override         {}
    void paintRowBackground (Graphics& g, int, int, int, bool) override   { g.fillAll (Colours::grey); }

    Component* refreshComponentForCell (int, int columnId, bool,
                                        Component* existingComponentToUpdate) override
    {
        auto* textButton = dynamic_cast<TextButton*> (existingComponentToUpdate);

        if (textButton == nullptr)
            textButton = new TextButton();

        textButton->setButtonText (getButtonName (columnId));
        textButton->setConnectedEdges (Button::ConnectedOnLeft | Button::ConnectedOnRight |
                                       Button::ConnectedOnTop  | Button::ConnectedOnBottom);

        const bool isPlusMinusButton = (columnId == plusButtonColumnId || columnId == minusButtonColumnId);

        if (isPlusMinusButton)
        {
            textButton->setEnabled (columnId == plusButtonColumnId ? canAddColumn : canRemoveColumn);
        }
        else
        {
            textButton->setRadioGroupId (1, NotificationType::dontSendNotification);
            textButton->setClickingTogglesState (true);

            auto busColour = Colours::green.withRotatedHue (static_cast<float> (columnId) / 5.0f);
            textButton->setColour (TextButton::buttonColourId, busColour);
            textButton->setColour (TextButton::buttonOnColourId, busColour.withMultipliedBrightness (2.0f));
        }

        textButton->addListener (this);

        return textButton;
    }

    //==============================================================================
    String getButtonName (int columnId)
    {
        if (columnId == plusButtonColumnId)  return "+";
        if (columnId == minusButtonColumnId) return "-";

        return String (columnId);
    }

    void buttonClicked (Button* btn) override
    {
        auto text = btn->getButtonText();

        if (text == "+") listener.addColumn();
        if (text == "-") listener.removeColumn();
    }

    void buttonStateChanged (Button* btn) override
    {
        auto text = btn->getButtonText();

        if (text == "+" || text == "-")
            return;

        if (btn->getToggleState())
            listener.columnSelected (text.getIntValue());
    }

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (NumberedBoxes)
};

//==============================================================================
class IOConfigurationWindow::InputOutputConfig  : public Component,
                                                  private ComboBox::Listener,
                                                  private Button::Listener,
                                                  private NumberedBoxes::Listener
{
public:
    InputOutputConfig (IOConfigurationWindow& parent, bool direction)
        : owner (parent),
          ioTitle ("ioLabel", direction ? "Input Configuration" : "Output Configuration"),
          ioBuses (*this, false, false),
          isInput (direction)
    {
        ioTitle.setFont (ioTitle.getFont().withStyle (Font::bold));
        nameLabel.setFont (nameLabel.getFont().withStyle (Font::bold));
        layoutLabel.setFont (layoutLabel.getFont().withStyle (Font::bold));
        enabledToggle.setClickingTogglesState (true);

        layouts.addListener (this);
        enabledToggle.addListener (this);

        addAndMakeVisible (layoutLabel);
        addAndMakeVisible (layouts);
        addAndMakeVisible (enabledToggle);
        addAndMakeVisible (ioTitle);
        addAndMakeVisible (nameLabel);
        addAndMakeVisible (name);
        addAndMakeVisible (ioBuses);

        updateBusButtons();
        updateBusLayout();
    }

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

    void resized() override
    {
        auto r = getLocalBounds().reduced (10);

        ioTitle.setBounds (r.removeFromTop (14));
        r.reduce (10, 0);
        r.removeFromTop (16);

        ioBuses.setBounds (r.removeFromTop (60));

        {
            auto label = r.removeFromTop (24);
            nameLabel.setBounds (label.removeFromLeft (100));
            enabledToggle.setBounds (label.removeFromRight (80));
            name.setBounds (label);
        }

        {
            auto label = r.removeFromTop (24);
            layoutLabel.setBounds (label.removeFromLeft (100));
            layouts.setBounds (label);
        }
    }

private:
    void updateBusButtons()
    {
        if (auto* plugin = owner.getAudioProcessor())
        {
            auto& header = ioBuses.getHeader();
            header.removeAllColumns();

            const int n = plugin->getBusCount (isInput);

            for (int i = 0; i < n; ++i)
                header.addColumn ("", i + 1, 40);

            header.addColumn ("+", NumberedBoxes::plusButtonColumnId,  20);
            header.addColumn ("-", NumberedBoxes::minusButtonColumnId, 20);

            ioBuses.setCanAddColumn    (plugin->canAddBus    (isInput));
            ioBuses.setCanRemoveColumn (plugin->canRemoveBus (isInput));
        }

        ioBuses.setSelected (currentBus + 1);
    }

    void updateBusLayout()
    {
        if (auto* plugin = owner.getAudioProcessor())
        {
            if (auto* bus = plugin->getBus (isInput, currentBus))
            {
                name.setText (bus->getName(), NotificationType::dontSendNotification);

                int i;
                for (i = 1; i < AudioChannelSet::maxChannelsOfNamedLayout; ++i)
                    if ((layouts.indexOfItemId(i) == -1) != bus->supportedLayoutWithChannels (i).isDisabled())
                        break;

                // supported layouts have changed
                if (i < AudioChannelSet::maxChannelsOfNamedLayout)
                {
                    layouts.clear();

                    for (i = 1; i < AudioChannelSet::maxChannelsOfNamedLayout; ++i)
                    {
                        auto set = bus->supportedLayoutWithChannels (i);

                        if (! set.isDisabled())
                            layouts.addItem (set.getDescription(), i);
                    }
                }

                layouts.setSelectedId (bus->getLastEnabledLayout().size());

                const bool canBeDisabled = bus->isNumberOfChannelsSupported (0);

                if (canBeDisabled != enabledToggle.isEnabled())
                    enabledToggle.setEnabled (canBeDisabled);

                enabledToggle.setToggleState (bus->isEnabled(), NotificationType::dontSendNotification);
            }
        }
    }

    //==============================================================================
    void comboBoxChanged (ComboBox* combo) override
    {
        if (combo == &layouts)
        {
            if (auto* p = owner.getAudioProcessor())
            {
                if (auto* bus = p->getBus (isInput, currentBus))
                {
                    auto selectedNumChannels = layouts.getSelectedId();

                    if (selectedNumChannels != bus->getLastEnabledLayout().size())
                    {
                        if (isPositiveAndBelow (selectedNumChannels, AudioChannelSet::maxChannelsOfNamedLayout)
                             && bus->setCurrentLayoutWithoutEnabling (bus->supportedLayoutWithChannels (selectedNumChannels)))
                        {
                            if (auto* config = owner.getConfig (! isInput))
                                config->updateBusLayout();

                            owner.update();
                        }
                    }
                }
            }
        }
    }

    void buttonClicked (Button*) override {}

    void buttonStateChanged (Button* btn) override
    {
        if (btn == &enabledToggle && enabledToggle.isEnabled())
        {
            if (auto* p = owner.getAudioProcessor())
            {
                if (auto* bus = p->getBus (isInput, currentBus))
                {
                    if (bus->isEnabled() != enabledToggle.getToggleState())
                    {
                        bool success = enabledToggle.getToggleState() ? bus->enable()
                                                                      : bus->setCurrentLayout (AudioChannelSet::disabled());

                        if (success)
                        {
                            updateBusLayout();

                            if (auto* config = owner.getConfig (! isInput))
                                config->updateBusLayout();

                            owner.update();
                        }
                        else
                        {
                            enabledToggle.setToggleState (! enabledToggle.getToggleState(),
                                                          NotificationType::dontSendNotification);
                        }
                    }
                }
            }
        }
    }

    //==============================================================================
    void addColumn() override
    {
        if (auto* p = owner.getAudioProcessor())
        {
            if (p->canAddBus (isInput))
            {
                if (p->addBus (isInput))
                {
                    updateBusButtons();
                    updateBusLayout();

                    if (auto* config = owner.getConfig (! isInput))
                    {
                        config->updateBusButtons();
                        config->updateBusLayout();
                    }
                }

                owner.update();
            }
        }
    }

    void removeColumn() override
    {
        if (auto* p = owner.getAudioProcessor())
        {
            if (p->getBusCount (isInput) > 1 && p->canRemoveBus (isInput))
            {
                if (p->removeBus (isInput))
                {
                    currentBus = jmin (p->getBusCount (isInput) - 1, currentBus);

                    updateBusButtons();
                    updateBusLayout();

                    if (auto* config = owner.getConfig (! isInput))
                    {
                        config->updateBusButtons();
                        config->updateBusLayout();
                    }

                    owner.update();
                }
            }
        }
    }

    void columnSelected (int columnId) override
    {
        const int newBus = columnId - 1;

        if (currentBus != newBus)
        {
            currentBus = newBus;
            ioBuses.setSelected (currentBus + 1);
            updateBusLayout();
        }
    }

    //==============================================================================
    IOConfigurationWindow& owner;
    Label ioTitle, name;
    Label nameLabel { "nameLabel", "Bus Name:" };
    Label layoutLabel { "layoutLabel", "Channel Layout:" };
    ToggleButton enabledToggle { "Enabled" };
    ComboBox layouts;
    NumberedBoxes ioBuses;
    bool isInput;
    int currentBus = 0;

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (InputOutputConfig)
};


IOConfigurationWindow::IOConfigurationWindow (AudioProcessor& p)
   : AudioProcessorEditor (&p),
     title ("title", p.getName())
{
    setOpaque (true);

    title.setFont (title.getFont().withStyle (Font::bold));
    addAndMakeVisible (title);

    {
        ScopedLock renderLock (p.getCallbackLock());
        p.suspendProcessing (true);
        p.releaseResources();
    }

    if (p.getBusCount (true)  > 0 || p.canAddBus (true))
    {
        inConfig.reset (new InputOutputConfig (*this, true));
        addAndMakeVisible (inConfig.get());
    }

    if (p.getBusCount (false) > 0 || p.canAddBus (false))
    {
        outConfig.reset (new InputOutputConfig (*this, false));
        addAndMakeVisible (outConfig.get());
    }

    currentLayout = p.getBusesLayout();
    setSize (400, (inConfig != nullptr && outConfig != nullptr ? 160 : 0) + 200);
}

IOConfigurationWindow::~IOConfigurationWindow()
{
    if (auto* graph = getGraph())
    {
        if (auto* p = getAudioProcessor())
        {
            ScopedLock renderLock (graph->getCallbackLock());

            graph->suspendProcessing (true);
            graph->releaseResources();

            p->prepareToPlay (graph->getSampleRate(), graph->getBlockSize());
            p->suspendProcessing (false);

            graph->prepareToPlay (graph->getSampleRate(), graph->getBlockSize());
            graph->suspendProcessing (false);
        }
    }
}

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

void IOConfigurationWindow::resized()
{
    auto r = getLocalBounds().reduced (10);

    title.setBounds (r.removeFromTop (14));
    r.reduce (10, 0);

    if (inConfig != nullptr)
        inConfig->setBounds (r.removeFromTop (160));

    if (outConfig != nullptr)
        outConfig->setBounds (r.removeFromTop (160));
}

void IOConfigurationWindow::update()
{
    auto nodeID = getNodeID();

    if (auto* graph = getGraph())
        if (nodeID != AudioProcessorGraph::NodeID())
            graph->disconnectNode (nodeID);

    if (auto* graphEditor = getGraphEditor())
        if (auto* panel = graphEditor->graphPanel.get())
            panel->updateComponents();
}

AudioProcessorGraph::NodeID IOConfigurationWindow::getNodeID() const
{
    if (auto* graph = getGraph())
        for (auto* node : graph->getNodes())
            if (node->getProcessor() == getAudioProcessor())
                return node->nodeID;

    return {};
}

MainHostWindow* IOConfigurationWindow::getMainWindow() const
{
    auto& desktop = Desktop::getInstance();

    for (int i = desktop.getNumComponents(); --i >= 0;)
        if (auto* mainWindow = dynamic_cast<MainHostWindow*> (desktop.getComponent(i)))
            return mainWindow;

    return nullptr;
}

GraphDocumentComponent* IOConfigurationWindow::getGraphEditor() const
{
    if (auto* mainWindow = getMainWindow())
        return mainWindow->graphHolder.get();

    return nullptr;
}

AudioProcessorGraph* IOConfigurationWindow::getGraph() const
{
    if (auto* graphEditor = getGraphEditor())
        if (auto* panel = graphEditor->graph.get())
            return &panel->graph;

    return nullptr;
}