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

   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.

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

namespace juce
{

struct SimpleDeviceManagerInputLevelMeter  : public Component,
                                             public Timer
{
    SimpleDeviceManagerInputLevelMeter (AudioDeviceManager& m)  : manager (m)
    {
        startTimerHz (20);
        inputLevelGetter = manager.getInputLevelGetter();
    }

    ~SimpleDeviceManagerInputLevelMeter() override
    {
    }

    void timerCallback() override
    {
        if (isShowing())
        {
            auto newLevel = (float) inputLevelGetter->getCurrentLevel();

            if (std::abs (level - newLevel) > 0.005f)
            {
                level = newLevel;
                repaint();
            }
        }
        else
        {
            level = 0;
        }
    }

    void paint (Graphics& g) override
    {
        // (add a bit of a skew to make the level more obvious)
        getLookAndFeel().drawLevelMeter (g, getWidth(), getHeight(),
                                         (float) std::exp (std::log (level) / 3.0));
    }

    AudioDeviceManager& manager;
    AudioDeviceManager::LevelMeter::Ptr inputLevelGetter;
    float level = 0;

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (SimpleDeviceManagerInputLevelMeter)
};


//==============================================================================
class AudioDeviceSelectorComponent::MidiInputSelectorComponentListBox  : public ListBox,
                                                                         private ListBoxModel
{
public:
    MidiInputSelectorComponentListBox (AudioDeviceManager& dm, const String& noItems)
        : ListBox ({}, nullptr),
          deviceManager (dm),
          noItemsMessage (noItems)
    {
        updateDevices();
        setModel (this);
        setOutlineThickness (1);
    }

    void updateDevices()
    {
        items = MidiInput::getAvailableDevices();
    }

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

    void paintListBoxItem (int row, Graphics& g, int width, int height, bool rowIsSelected) override
    {
        if (isPositiveAndBelow (row, items.size()))
        {
            if (rowIsSelected)
                g.fillAll (findColour (TextEditor::highlightColourId)
                               .withMultipliedAlpha (0.3f));

            auto item = items[row];
            bool enabled = deviceManager.isMidiInputDeviceEnabled (item.identifier);

            auto x = getTickX();
            auto tickW = height * 0.75f;

            getLookAndFeel().drawTickBox (g, *this, x - tickW, (height - tickW) / 2, tickW, tickW,
                                          enabled, true, true, false);

            g.setFont (height * 0.6f);
            g.setColour (findColour (ListBox::textColourId, true).withMultipliedAlpha (enabled ? 1.0f : 0.6f));
            g.drawText (item.name, x + 5, 0, width - x - 5, height, Justification::centredLeft, true);
        }
    }

    void listBoxItemClicked (int row, const MouseEvent& e) override
    {
        selectRow (row);

        if (e.x < getTickX())
            flipEnablement (row);
    }

    void listBoxItemDoubleClicked (int row, const MouseEvent&) override
    {
        flipEnablement (row);
    }

    void returnKeyPressed (int row) override
    {
        flipEnablement (row);
    }

    void paint (Graphics& g) override
    {
        ListBox::paint (g);

        if (items.isEmpty())
        {
            g.setColour (Colours::grey);
            g.setFont (0.5f * getRowHeight());
            g.drawText (noItemsMessage,
                        0, 0, getWidth(), getHeight() / 2,
                        Justification::centred, true);
        }
    }

    int getBestHeight (int preferredHeight)
    {
        auto extra = getOutlineThickness() * 2;

        return jmax (getRowHeight() * 2 + extra,
                     jmin (getRowHeight() * getNumRows() + extra,
                           preferredHeight));
    }

private:
    //==============================================================================
    AudioDeviceManager& deviceManager;
    const String noItemsMessage;
    Array<MidiDeviceInfo> items;

    void flipEnablement (const int row)
    {
        if (isPositiveAndBelow (row, items.size()))
        {
            auto identifier = items[row].identifier;
            deviceManager.setMidiInputDeviceEnabled (identifier, ! deviceManager.isMidiInputDeviceEnabled (identifier));
        }
    }

    int getTickX() const
    {
        return getRowHeight();
    }

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (MidiInputSelectorComponentListBox)
};


//==============================================================================
struct AudioDeviceSetupDetails
{
    AudioDeviceManager* manager;
    int minNumInputChannels, maxNumInputChannels;
    int minNumOutputChannels, maxNumOutputChannels;
    bool useStereoPairs;
};

static String getNoDeviceString()   { return "<< " + TRANS("none") + " >>"; }

//==============================================================================
class AudioDeviceSettingsPanel : public Component,
                                 private ChangeListener
{
public:
    AudioDeviceSettingsPanel (AudioIODeviceType& t, AudioDeviceSetupDetails& setupDetails,
                              const bool hideAdvancedOptionsWithButton)
        : type (t), setup (setupDetails)
    {
        if (hideAdvancedOptionsWithButton)
        {
            showAdvancedSettingsButton.reset (new TextButton (TRANS("Show advanced settings...")));
            addAndMakeVisible (showAdvancedSettingsButton.get());
            showAdvancedSettingsButton->setClickingTogglesState (true);
            showAdvancedSettingsButton->onClick = [this] { toggleAdvancedSettings(); };
        }

        type.scanForDevices();

        setup.manager->addChangeListener (this);
    }

    ~AudioDeviceSettingsPanel() override
    {
        setup.manager->removeChangeListener (this);
    }

    void resized() override
    {
        if (auto* parent = findParentComponentOfClass<AudioDeviceSelectorComponent>())
        {
            Rectangle<int> r (proportionOfWidth (0.35f), 0, proportionOfWidth (0.6f), 3000);

            const int maxListBoxHeight = 100;
            const int h = parent->getItemHeight();
            const int space = h / 4;

            if (outputDeviceDropDown != nullptr)
            {
                auto row = r.removeFromTop (h);

                if (testButton != nullptr)
                {
                    testButton->changeWidthToFitText (h);
                    testButton->setBounds (row.removeFromRight (testButton->getWidth()));
                    row.removeFromRight (space);
                }

                outputDeviceDropDown->setBounds (row);
                r.removeFromTop (space);
            }

            if (inputDeviceDropDown != nullptr)
            {
                auto row = r.removeFromTop (h);

                inputLevelMeter->setBounds (row.removeFromRight (testButton != nullptr ? testButton->getWidth() : row.getWidth() / 6));
                row.removeFromRight (space);
                inputDeviceDropDown->setBounds (row);
                r.removeFromTop (space);
            }

            if (outputChanList != nullptr)
            {
                outputChanList->setRowHeight (jmin (22, h));
                outputChanList->setBounds (r.removeFromTop (outputChanList->getBestHeight (maxListBoxHeight)));
                outputChanLabel->setBounds (0, outputChanList->getBounds().getCentreY() - h / 2, r.getX(), h);
                r.removeFromTop (space);
            }

            if (inputChanList != nullptr)
            {
                inputChanList->setRowHeight (jmin (22, h));
                inputChanList->setBounds (r.removeFromTop (inputChanList->getBestHeight (maxListBoxHeight)));
                inputChanLabel->setBounds (0, inputChanList->getBounds().getCentreY() - h / 2, r.getX(), h);
                r.removeFromTop (space);
            }

            r.removeFromTop (space * 2);

            if (showAdvancedSettingsButton != nullptr
                && sampleRateDropDown != nullptr && bufferSizeDropDown != nullptr)
            {
                showAdvancedSettingsButton->setBounds (r.removeFromTop (h));
                r.removeFromTop (space);
                showAdvancedSettingsButton->changeWidthToFitText();
            }

            auto advancedSettingsVisible = showAdvancedSettingsButton == nullptr
                                              || showAdvancedSettingsButton->getToggleState();

            if (sampleRateDropDown != nullptr)
            {
                sampleRateDropDown->setVisible (advancedSettingsVisible);

                if (advancedSettingsVisible)
                {
                    sampleRateDropDown->setBounds (r.removeFromTop (h));
                    r.removeFromTop (space);
                }
            }

            if (bufferSizeDropDown != nullptr)
            {
                bufferSizeDropDown->setVisible (advancedSettingsVisible);

                if (advancedSettingsVisible)
                {
                    bufferSizeDropDown->setBounds (r.removeFromTop (h));
                    r.removeFromTop (space);
                }
            }

            r.removeFromTop (space);

            if (showUIButton != nullptr || resetDeviceButton != nullptr)
            {
                auto buttons = r.removeFromTop (h);

                if (showUIButton != nullptr)
                {
                    showUIButton->setVisible (advancedSettingsVisible);
                    showUIButton->changeWidthToFitText (h);
                    showUIButton->setBounds (buttons.removeFromLeft (showUIButton->getWidth()));
                    buttons.removeFromLeft (space);
                }

                if (resetDeviceButton != nullptr)
                {
                    resetDeviceButton->setVisible (advancedSettingsVisible);
                    resetDeviceButton->changeWidthToFitText (h);
                    resetDeviceButton->setBounds (buttons.removeFromLeft (resetDeviceButton->getWidth()));
                }

                r.removeFromTop (space);
            }

            setSize (getWidth(), r.getY());
        }
        else
        {
            jassertfalse;
        }
    }

    void updateConfig (bool updateOutputDevice, bool updateInputDevice, bool updateSampleRate, bool updateBufferSize)
    {
        auto config = setup.manager->getAudioDeviceSetup();
        String error;

        if (updateOutputDevice || updateInputDevice)
        {
            if (outputDeviceDropDown != nullptr)
                config.outputDeviceName = outputDeviceDropDown->getSelectedId() < 0 ? String()
                                                                                    : outputDeviceDropDown->getText();

            if (inputDeviceDropDown != nullptr)
                config.inputDeviceName = inputDeviceDropDown->getSelectedId() < 0 ? String()
                                                                                  : inputDeviceDropDown->getText();

            if (! type.hasSeparateInputsAndOutputs())
                config.inputDeviceName = config.outputDeviceName;

            if (updateInputDevice)
                config.useDefaultInputChannels = true;
            else
                config.useDefaultOutputChannels = true;

            error = setup.manager->setAudioDeviceSetup (config, true);

            showCorrectDeviceName (inputDeviceDropDown.get(), true);
            showCorrectDeviceName (outputDeviceDropDown.get(), false);

            updateControlPanelButton();
            resized();
        }
        else if (updateSampleRate)
        {
            if (sampleRateDropDown->getSelectedId() > 0)
            {
                config.sampleRate = sampleRateDropDown->getSelectedId();
                error = setup.manager->setAudioDeviceSetup (config, true);
            }
        }
        else if (updateBufferSize)
        {
            if (bufferSizeDropDown->getSelectedId() > 0)
            {
                config.bufferSize = bufferSizeDropDown->getSelectedId();
                error = setup.manager->setAudioDeviceSetup (config, true);
            }
        }

        if (error.isNotEmpty())
            AlertWindow::showMessageBoxAsync (AlertWindow::WarningIcon,
                                              TRANS("Error when trying to open audio device!"),
                                              error);
    }

    bool showDeviceControlPanel()
    {
        if (auto* device = setup.manager->getCurrentAudioDevice())
        {
            Component modalWindow;
            modalWindow.setOpaque (true);
            modalWindow.addToDesktop (0);
            modalWindow.enterModalState();

            return device->showControlPanel();
        }

        return false;
    }

    void toggleAdvancedSettings()
    {
        showAdvancedSettingsButton->setButtonText ((showAdvancedSettingsButton->getToggleState() ? "Hide " : "Show ")
                                                   + String ("advanced settings..."));
        resized();
    }

    void showDeviceUIPanel()
    {
        if (showDeviceControlPanel())
        {
            setup.manager->closeAudioDevice();
            setup.manager->restartLastAudioDevice();
            getTopLevelComponent()->toFront (true);
        }
    }

    void playTestSound()
    {
        setup.manager->playTestSound();
    }

    void updateAllControls()
    {
        updateOutputsComboBox();
        updateInputsComboBox();

        updateControlPanelButton();
        updateResetButton();

        if (auto* currentDevice = setup.manager->getCurrentAudioDevice())
        {
            if (setup.maxNumOutputChannels > 0
                 && setup.minNumOutputChannels < setup.manager->getCurrentAudioDevice()->getOutputChannelNames().size())
            {
                if (outputChanList == nullptr)
                {
                    outputChanList.reset (new ChannelSelectorListBox (setup, ChannelSelectorListBox::audioOutputType,
                                                                      TRANS ("(no audio output channels found)")));
                    addAndMakeVisible (outputChanList.get());
                    outputChanLabel.reset (new Label ({}, TRANS("Active output channels:")));
                    outputChanLabel->setJustificationType (Justification::centredRight);
                    outputChanLabel->attachToComponent (outputChanList.get(), true);
                }

                outputChanList->refresh();
            }
            else
            {
                outputChanLabel.reset();
                outputChanList.reset();
            }

            if (setup.maxNumInputChannels > 0
                 && setup.minNumInputChannels < setup.manager->getCurrentAudioDevice()->getInputChannelNames().size())
            {
                if (inputChanList == nullptr)
                {
                    inputChanList.reset (new ChannelSelectorListBox (setup, ChannelSelectorListBox::audioInputType,
                                                                     TRANS("(no audio input channels found)")));
                    addAndMakeVisible (inputChanList.get());
                    inputChanLabel.reset (new Label ({}, TRANS("Active input channels:")));
                    inputChanLabel->setJustificationType (Justification::centredRight);
                    inputChanLabel->attachToComponent (inputChanList.get(), true);
                }

                inputChanList->refresh();
            }
            else
            {
                inputChanLabel.reset();
                inputChanList.reset();
            }

            updateSampleRateComboBox (currentDevice);
            updateBufferSizeComboBox (currentDevice);
        }
        else
        {
            jassert (setup.manager->getCurrentAudioDevice() == nullptr); // not the correct device type!

            inputChanLabel.reset();
            outputChanLabel.reset();
            sampleRateLabel.reset();
            bufferSizeLabel.reset();

            inputChanList.reset();
            outputChanList.reset();
            sampleRateDropDown.reset();
            bufferSizeDropDown.reset();

            if (outputDeviceDropDown != nullptr)
                outputDeviceDropDown->setSelectedId (-1, dontSendNotification);

            if (inputDeviceDropDown != nullptr)
                inputDeviceDropDown->setSelectedId (-1, dontSendNotification);
        }

        sendLookAndFeelChange();
        resized();
        setSize (getWidth(), getLowestY() + 4);
    }

    void changeListenerCallback (ChangeBroadcaster*) override
    {
        updateAllControls();
    }

    void resetDevice()
    {
        setup.manager->closeAudioDevice();
        setup.manager->restartLastAudioDevice();
    }

private:
    AudioIODeviceType& type;
    const AudioDeviceSetupDetails setup;

    std::unique_ptr<ComboBox> outputDeviceDropDown, inputDeviceDropDown, sampleRateDropDown, bufferSizeDropDown;
    std::unique_ptr<Label> outputDeviceLabel, inputDeviceLabel, sampleRateLabel, bufferSizeLabel, inputChanLabel, outputChanLabel;
    std::unique_ptr<TextButton> testButton;
    std::unique_ptr<Component> inputLevelMeter;
    std::unique_ptr<TextButton> showUIButton, showAdvancedSettingsButton, resetDeviceButton;

    void showCorrectDeviceName (ComboBox* box, bool isInput)
    {
        if (box != nullptr)
        {
            auto* currentDevice = setup.manager->getCurrentAudioDevice();
            auto index = type.getIndexOfDevice (currentDevice, isInput);

            box->setSelectedId (index < 0 ? index : index + 1, dontSendNotification);

            if (testButton != nullptr && ! isInput)
                testButton->setEnabled (index >= 0);
        }
    }

    void addNamesToDeviceBox (ComboBox& combo, bool isInputs)
    {
        const StringArray devs (type.getDeviceNames (isInputs));

        combo.clear (dontSendNotification);

        for (int i = 0; i < devs.size(); ++i)
            combo.addItem (devs[i], i + 1);

        combo.addItem (getNoDeviceString(), -1);
        combo.setSelectedId (-1, dontSendNotification);
    }

    int getLowestY() const
    {
        int y = 0;

        for (auto* c : getChildren())
            y = jmax (y, c->getBottom());

        return y;
    }

    void updateControlPanelButton()
    {
        auto* currentDevice = setup.manager->getCurrentAudioDevice();
        showUIButton.reset();

        if (currentDevice != nullptr && currentDevice->hasControlPanel())
        {
            showUIButton.reset (new TextButton (TRANS ("Control Panel"),
                                                TRANS ("Opens the device's own control panel")));
            addAndMakeVisible (showUIButton.get());
            showUIButton->onClick = [this] { showDeviceUIPanel(); };
        }

        resized();
    }

    void updateResetButton()
    {
        if (auto* currentDevice = setup.manager->getCurrentAudioDevice())
        {
            if (currentDevice->hasControlPanel())
            {
                if (resetDeviceButton == nullptr)
                {
                    resetDeviceButton.reset (new TextButton (TRANS ("Reset Device"),
                                                             TRANS ("Resets the audio interface - sometimes needed after changing a device's properties in its custom control panel")));
                    addAndMakeVisible (resetDeviceButton.get());
                    resetDeviceButton->onClick = [this] { resetDevice(); };
                    resized();
                }

                return;
            }
        }

        resetDeviceButton.reset();
    }

    void updateOutputsComboBox()
    {
        if (setup.maxNumOutputChannels > 0 || ! type.hasSeparateInputsAndOutputs())
        {
            if (outputDeviceDropDown == nullptr)
            {
                outputDeviceDropDown.reset (new ComboBox());
                outputDeviceDropDown->onChange = [this] { updateConfig (true, false, false, false); };

                addAndMakeVisible (outputDeviceDropDown.get());

                outputDeviceLabel.reset (new Label ({}, type.hasSeparateInputsAndOutputs() ? TRANS("Output:")
                                                                                           : TRANS("Device:")));
                outputDeviceLabel->attachToComponent (outputDeviceDropDown.get(), true);

                if (setup.maxNumOutputChannels > 0)
                {
                    testButton.reset (new TextButton (TRANS("Test"), TRANS("Plays a test tone")));
                    addAndMakeVisible (testButton.get());
                    testButton->onClick = [this] { playTestSound(); };
                }
            }

            addNamesToDeviceBox (*outputDeviceDropDown, false);
        }

        showCorrectDeviceName (outputDeviceDropDown.get(), false);
    }

    void updateInputsComboBox()
    {
        if (setup.maxNumInputChannels > 0 && type.hasSeparateInputsAndOutputs())
        {
            if (inputDeviceDropDown == nullptr)
            {
                inputDeviceDropDown.reset (new ComboBox());
                inputDeviceDropDown->onChange = [this] { updateConfig (false, true, false, false); };
                addAndMakeVisible (inputDeviceDropDown.get());

                inputDeviceLabel.reset (new Label ({}, TRANS("Input:")));
                inputDeviceLabel->attachToComponent (inputDeviceDropDown.get(), true);

                inputLevelMeter.reset (new SimpleDeviceManagerInputLevelMeter (*setup.manager));
                addAndMakeVisible (inputLevelMeter.get());
            }

            addNamesToDeviceBox (*inputDeviceDropDown, true);
        }

        showCorrectDeviceName (inputDeviceDropDown.get(), true);
    }

    void updateSampleRateComboBox (AudioIODevice* currentDevice)
    {
        if (sampleRateDropDown == nullptr)
        {
            sampleRateDropDown.reset (new ComboBox());
            addAndMakeVisible (sampleRateDropDown.get());

            sampleRateLabel.reset (new Label ({}, TRANS("Sample rate:")));
            sampleRateLabel->attachToComponent (sampleRateDropDown.get(), true);
        }
        else
        {
            sampleRateDropDown->clear();
            sampleRateDropDown->onChange = nullptr;
        }

        for (auto rate : currentDevice->getAvailableSampleRates())
        {
            auto intRate = roundToInt (rate);
            sampleRateDropDown->addItem (String (intRate) + " Hz", intRate);
        }

        sampleRateDropDown->setSelectedId (roundToInt (currentDevice->getCurrentSampleRate()), dontSendNotification);
        sampleRateDropDown->onChange = [this] { updateConfig (false, false, true, false); };
    }

    void updateBufferSizeComboBox (AudioIODevice* currentDevice)
    {
        if (bufferSizeDropDown == nullptr)
        {
            bufferSizeDropDown.reset (new ComboBox());
            addAndMakeVisible (bufferSizeDropDown.get());

            bufferSizeLabel.reset (new Label ({}, TRANS("Audio buffer size:")));
            bufferSizeLabel->attachToComponent (bufferSizeDropDown.get(), true);
        }
        else
        {
            bufferSizeDropDown->clear();
            bufferSizeDropDown->onChange = nullptr;
        }

        auto currentRate = currentDevice->getCurrentSampleRate();

        if (currentRate == 0)
            currentRate = 48000.0;

        for (auto bs : currentDevice->getAvailableBufferSizes())
            bufferSizeDropDown->addItem (String (bs) + " samples (" + String (bs * 1000.0 / currentRate, 1) + " ms)", bs);

        bufferSizeDropDown->setSelectedId (currentDevice->getCurrentBufferSizeSamples(), dontSendNotification);
        bufferSizeDropDown->onChange = [this] { updateConfig (false, false, false, true); };
    }

public:
    //==============================================================================
    class ChannelSelectorListBox  : public ListBox,
                                    private ListBoxModel
    {
    public:
        enum BoxType
        {
            audioInputType,
            audioOutputType
        };

        //==============================================================================
        ChannelSelectorListBox (const AudioDeviceSetupDetails& setupDetails, BoxType boxType, const String& noItemsText)
           : ListBox ({}, nullptr), setup (setupDetails), type (boxType), noItemsMessage (noItemsText)
        {
            refresh();
            setModel (this);
            setOutlineThickness (1);
        }

        void refresh()
        {
            items.clear();

            if (auto* currentDevice = setup.manager->getCurrentAudioDevice())
            {
                if (type == audioInputType)
                    items = currentDevice->getInputChannelNames();
                else if (type == audioOutputType)
                    items = currentDevice->getOutputChannelNames();

                if (setup.useStereoPairs)
                {
                    StringArray pairs;

                    for (int i = 0; i < items.size(); i += 2)
                    {
                        auto& name = items[i];

                        if (i + 1 >= items.size())
                            pairs.add (name.trim());
                        else
                            pairs.add (getNameForChannelPair (name, items[i + 1]));
                    }

                    items = pairs;
                }
            }

            updateContent();
            repaint();
        }

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

        void paintListBoxItem (int row, Graphics& g, int width, int height, bool) override
        {
            if (isPositiveAndBelow (row, items.size()))
            {
                g.fillAll (findColour (ListBox::backgroundColourId));

                auto item = items[row];
                bool enabled = false;
                auto config = setup.manager->getAudioDeviceSetup();

                if (setup.useStereoPairs)
                {
                    if (type == audioInputType)
                        enabled = config.inputChannels[row * 2] || config.inputChannels[row * 2 + 1];
                    else if (type == audioOutputType)
                        enabled = config.outputChannels[row * 2] || config.outputChannels[row * 2 + 1];
                }
                else
                {
                    if (type == audioInputType)
                        enabled = config.inputChannels[row];
                    else if (type == audioOutputType)
                        enabled = config.outputChannels[row];
                }

                auto x = getTickX();
                auto tickW = height * 0.75f;

                getLookAndFeel().drawTickBox (g, *this, x - tickW, (height - tickW) / 2, tickW, tickW,
                                              enabled, true, true, false);

                g.setFont (height * 0.6f);
                g.setColour (findColour (ListBox::textColourId, true).withMultipliedAlpha (enabled ? 1.0f : 0.6f));
                g.drawText (item, x + 5, 0, width - x - 5, height, Justification::centredLeft, true);
            }
        }

        void listBoxItemClicked (int row, const MouseEvent& e) override
        {
            selectRow (row);

            if (e.x < getTickX())
                flipEnablement (row);
        }

        void listBoxItemDoubleClicked (int row, const MouseEvent&) override
        {
            flipEnablement (row);
        }

        void returnKeyPressed (int row) override
        {
            flipEnablement (row);
        }

        void paint (Graphics& g) override
        {
            ListBox::paint (g);

            if (items.isEmpty())
            {
                g.setColour (Colours::grey);
                g.setFont (0.5f * getRowHeight());
                g.drawText (noItemsMessage,
                            0, 0, getWidth(), getHeight() / 2,
                            Justification::centred, true);
            }
        }

        int getBestHeight (int maxHeight)
        {
            return getRowHeight() * jlimit (2, jmax (2, maxHeight / getRowHeight()),
                                            getNumRows())
                       + getOutlineThickness() * 2;
        }

    private:
        //==============================================================================
        const AudioDeviceSetupDetails setup;
        const BoxType type;
        const String noItemsMessage;
        StringArray items;

        static String getNameForChannelPair (const String& name1, const String& name2)
        {
            String commonBit;

            for (int j = 0; j < name1.length(); ++j)
                if (name1.substring (0, j).equalsIgnoreCase (name2.substring (0, j)))
                    commonBit = name1.substring (0, j);

            // Make sure we only split the name at a space, because otherwise, things
            // like "input 11" + "input 12" would become "input 11 + 2"
            while (commonBit.isNotEmpty() && ! CharacterFunctions::isWhitespace (commonBit.getLastCharacter()))
                commonBit = commonBit.dropLastCharacters (1);

            return name1.trim() + " + " + name2.substring (commonBit.length()).trim();
        }

        void flipEnablement (int row)
        {
            jassert (type == audioInputType || type == audioOutputType);

            if (isPositiveAndBelow (row, items.size()))
            {
                auto config = setup.manager->getAudioDeviceSetup();

                if (setup.useStereoPairs)
                {
                    BigInteger bits;
                    auto& original = (type == audioInputType ? config.inputChannels
                                                             : config.outputChannels);

                    for (int i = 0; i < 256; i += 2)
                        bits.setBit (i / 2, original[i] || original[i + 1]);

                    if (type == audioInputType)
                    {
                        config.useDefaultInputChannels = false;
                        flipBit (bits, row, setup.minNumInputChannels / 2, setup.maxNumInputChannels / 2);
                    }
                    else
                    {
                        config.useDefaultOutputChannels = false;
                        flipBit (bits, row, setup.minNumOutputChannels / 2, setup.maxNumOutputChannels / 2);
                    }

                    for (int i = 0; i < 256; ++i)
                        original.setBit (i, bits[i / 2]);
                }
                else
                {
                    if (type == audioInputType)
                    {
                        config.useDefaultInputChannels = false;
                        flipBit (config.inputChannels, row, setup.minNumInputChannels, setup.maxNumInputChannels);
                    }
                    else
                    {
                        config.useDefaultOutputChannels = false;
                        flipBit (config.outputChannels, row, setup.minNumOutputChannels, setup.maxNumOutputChannels);
                    }
                }

                setup.manager->setAudioDeviceSetup (config, true);
            }
        }

        static void flipBit (BigInteger& chans, int index, int minNumber, int maxNumber)
        {
            auto numActive = chans.countNumberOfSetBits();

            if (chans[index])
            {
                if (numActive > minNumber)
                    chans.setBit (index, false);
            }
            else
            {
                if (numActive >= maxNumber)
                {
                    auto firstActiveChan = chans.findNextSetBit (0);
                    chans.clearBit (index > firstActiveChan ? firstActiveChan : chans.getHighestBit());
                }

                chans.setBit (index, true);
            }
        }

        int getTickX() const
        {
            return getRowHeight();
        }

        JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (ChannelSelectorListBox)
    };

private:
    std::unique_ptr<ChannelSelectorListBox> inputChanList, outputChanList;

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (AudioDeviceSettingsPanel)
};


//==============================================================================
AudioDeviceSelectorComponent::AudioDeviceSelectorComponent (AudioDeviceManager& dm,
                                                            int minInputChannelsToUse,
                                                            int maxInputChannelsToUse,
                                                            int minOutputChannelsToUse,
                                                            int maxOutputChannelsToUse,
                                                            bool showMidiInputOptions,
                                                            bool showMidiOutputSelector,
                                                            bool showChannelsAsStereoPairsToUse,
                                                            bool hideAdvancedOptionsWithButtonToUse)
    : deviceManager (dm),
      itemHeight (24),
      minOutputChannels (minOutputChannelsToUse),
      maxOutputChannels (maxOutputChannelsToUse),
      minInputChannels (minInputChannelsToUse),
      maxInputChannels (maxInputChannelsToUse),
      showChannelsAsStereoPairs (showChannelsAsStereoPairsToUse),
      hideAdvancedOptionsWithButton (hideAdvancedOptionsWithButtonToUse)
{
    jassert (minOutputChannels >= 0 && minOutputChannels <= maxOutputChannels);
    jassert (minInputChannels >= 0 && minInputChannels <= maxInputChannels);

    const OwnedArray<AudioIODeviceType>& types = deviceManager.getAvailableDeviceTypes();

    if (types.size() > 1)
    {
        deviceTypeDropDown.reset (new ComboBox());

        for (int i = 0; i < types.size(); ++i)
            deviceTypeDropDown->addItem (types.getUnchecked(i)->getTypeName(), i + 1);

        addAndMakeVisible (deviceTypeDropDown.get());
        deviceTypeDropDown->onChange = [this] { updateDeviceType(); };

        deviceTypeDropDownLabel.reset (new Label ({}, TRANS("Audio device type:")));
        deviceTypeDropDownLabel->setJustificationType (Justification::centredRight);
        deviceTypeDropDownLabel->attachToComponent (deviceTypeDropDown.get(), true);
    }

    if (showMidiInputOptions)
    {
        midiInputsList.reset (new MidiInputSelectorComponentListBox (deviceManager,
                                                                     "(" + TRANS("No MIDI inputs available") + ")"));
        addAndMakeVisible (midiInputsList.get());

        midiInputsLabel.reset (new Label ({}, TRANS ("Active MIDI inputs:")));
        midiInputsLabel->setJustificationType (Justification::topRight);
        midiInputsLabel->attachToComponent (midiInputsList.get(), true);

        if (BluetoothMidiDevicePairingDialogue::isAvailable())
        {
            bluetoothButton.reset (new TextButton (TRANS("Bluetooth MIDI"), TRANS("Scan for bluetooth MIDI devices")));
            addAndMakeVisible (bluetoothButton.get());
            bluetoothButton->onClick = [this] { handleBluetoothButton(); };
        }
    }
    else
    {
        midiInputsList.reset();
        midiInputsLabel.reset();
        bluetoothButton.reset();
    }

    if (showMidiOutputSelector)
    {
        midiOutputSelector.reset (new ComboBox());
        addAndMakeVisible (midiOutputSelector.get());
        midiOutputSelector->onChange = [this] { updateMidiOutput(); };

        midiOutputLabel.reset (new Label ("lm", TRANS("MIDI Output:")));
        midiOutputLabel->attachToComponent (midiOutputSelector.get(), true);
    }
    else
    {
        midiOutputSelector.reset();
        midiOutputLabel.reset();
    }

    deviceManager.addChangeListener (this);
    updateAllControls();
    startTimer (1000);
}

AudioDeviceSelectorComponent::~AudioDeviceSelectorComponent()
{
    deviceManager.removeChangeListener (this);
}

void AudioDeviceSelectorComponent::setItemHeight (int newItemHeight)
{
    itemHeight = newItemHeight;
    resized();
}

void AudioDeviceSelectorComponent::resized()
{
    Rectangle<int> r (proportionOfWidth (0.35f), 15, proportionOfWidth (0.6f), 3000);
    auto space = itemHeight / 4;

    if (deviceTypeDropDown != nullptr)
    {
        deviceTypeDropDown->setBounds (r.removeFromTop (itemHeight));
        r.removeFromTop (space * 3);
    }

    if (audioDeviceSettingsComp != nullptr)
    {
        audioDeviceSettingsComp->resized();
        audioDeviceSettingsComp->setBounds (r.removeFromTop (audioDeviceSettingsComp->getHeight())
                                                .withX (0).withWidth (getWidth()));
        r.removeFromTop (space);
    }

    if (midiInputsList != nullptr)
    {
        midiInputsList->setRowHeight (jmin (22, itemHeight));
        midiInputsList->setBounds (r.removeFromTop (midiInputsList->getBestHeight (jmin (itemHeight * 8,
                                                                                         getHeight() - r.getY() - space - itemHeight))));
        r.removeFromTop (space);
    }

    if (bluetoothButton != nullptr)
    {
        bluetoothButton->setBounds (r.removeFromTop (24));
        r.removeFromTop (space);
    }

    if (midiOutputSelector != nullptr)
        midiOutputSelector->setBounds (r.removeFromTop (itemHeight));

    r.removeFromTop (itemHeight);
    setSize (getWidth(), r.getY());
}

void AudioDeviceSelectorComponent::timerCallback()
{
    // TODO
    // unfortunately, the AudioDeviceManager only gives us changeListenerCallbacks
    // if an audio device has changed, but not if a MIDI device has changed.
    // This needs to be implemented properly. Until then, we use a workaround
    // where we update the whole component once per second on a timer callback.
    updateAllControls();
}

void AudioDeviceSelectorComponent::updateDeviceType()
{
    if (auto* type = deviceManager.getAvailableDeviceTypes() [deviceTypeDropDown->getSelectedId() - 1])
    {
        audioDeviceSettingsComp.reset();
        deviceManager.setCurrentAudioDeviceType (type->getTypeName(), true);
        updateAllControls(); // needed in case the type hasn't actually changed
    }
}

void AudioDeviceSelectorComponent::updateMidiOutput()
{
    auto selectedId = midiOutputSelector->getSelectedId();

    if (selectedId == -1)
        deviceManager.setDefaultMidiOutputDevice ({});
    else
        deviceManager.setDefaultMidiOutputDevice (currentMidiOutputs[selectedId - 1].identifier);
}

void AudioDeviceSelectorComponent::changeListenerCallback (ChangeBroadcaster*)
{
    updateAllControls();
}

void AudioDeviceSelectorComponent::updateAllControls()
{
    if (deviceTypeDropDown != nullptr)
        deviceTypeDropDown->setText (deviceManager.getCurrentAudioDeviceType(), dontSendNotification);

    if (audioDeviceSettingsComp == nullptr
         || audioDeviceSettingsCompType != deviceManager.getCurrentAudioDeviceType())
    {
        audioDeviceSettingsCompType = deviceManager.getCurrentAudioDeviceType();
        audioDeviceSettingsComp.reset();

        if (auto* type = deviceManager.getAvailableDeviceTypes() [deviceTypeDropDown == nullptr
                                                                   ? 0 : deviceTypeDropDown->getSelectedId() - 1])
        {
            AudioDeviceSetupDetails details;
            details.manager = &deviceManager;
            details.minNumInputChannels = minInputChannels;
            details.maxNumInputChannels = maxInputChannels;
            details.minNumOutputChannels = minOutputChannels;
            details.maxNumOutputChannels = maxOutputChannels;
            details.useStereoPairs = showChannelsAsStereoPairs;

            auto* sp = new AudioDeviceSettingsPanel (*type, details, hideAdvancedOptionsWithButton);
            audioDeviceSettingsComp.reset (sp);
            addAndMakeVisible (sp);
            sp->updateAllControls();
        }
    }

    if (midiInputsList != nullptr)
    {
        midiInputsList->updateDevices();
        midiInputsList->updateContent();
        midiInputsList->repaint();
    }

    if (midiOutputSelector != nullptr)
    {
        midiOutputSelector->clear();

        currentMidiOutputs = MidiOutput::getAvailableDevices();

        midiOutputSelector->addItem (getNoDeviceString(), -1);
        midiOutputSelector->addSeparator();

        auto defaultOutputIdentifier = deviceManager.getDefaultMidiOutputIdentifier();
        int i = 0;

        for (auto& out : currentMidiOutputs)
        {
            midiOutputSelector->addItem (out.name, i + 1);

            if (defaultOutputIdentifier.isNotEmpty() && out.identifier == defaultOutputIdentifier)
                midiOutputSelector->setSelectedId (i + 1);

            ++i;
        }
    }

    resized();
}

void AudioDeviceSelectorComponent::handleBluetoothButton()
{
    if (! RuntimePermissions::isGranted (RuntimePermissions::bluetoothMidi))
        RuntimePermissions::request (RuntimePermissions::bluetoothMidi, nullptr);

    if (RuntimePermissions::isGranted (RuntimePermissions::bluetoothMidi))
        BluetoothMidiDevicePairingDialogue::open();
}

ListBox* AudioDeviceSelectorComponent::getMidiInputSelectorListBox() const noexcept
{
    return midiInputsList.get();
}

} // namespace juce