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

   This file is part of the JUCE library.
   Copyright (c) 2015 - ROLI Ltd.

   Permission is granted to use this software under the terms of either:
   a) the GPL v2 (or any later version)
   b) the Affero GPL v3

   Details of these licenses can be found at: www.gnu.org/licenses

   JUCE is distributed in the hope that it will be useful, but WITHOUT ANY
   WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
   A PARTICULAR PURPOSE.  See the GNU General Public License for more details.

   ------------------------------------------------------------------------------

   To release a closed-source product which uses JUCE, commercial licenses are
   available: visit www.juce.com for more information.

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

#ifndef JUCE_STANDALONEFILTERWINDOW_H_INCLUDED
#define JUCE_STANDALONEFILTERWINDOW_H_INCLUDED

extern AudioProcessor* JUCE_CALLTYPE createPluginFilter();

//==============================================================================
/**
    An object that creates and plays a standalone instance of an AudioProcessor.

    The object will create your processor using the same createPluginFilter()
    function that the other plugin wrappers use, and will run it through the
    computer's audio/MIDI devices using AudioDeviceManager and AudioProcessorPlayer.
*/
class StandalonePluginHolder
{
public:
    /** Creates an instance of the default plugin.

        The settings object can be a PropertySet that the class should use to
        store its settings - the object that is passed-in will be owned by this
        class and deleted automatically when no longer needed. (It can also be null)
    */
    StandalonePluginHolder (PropertySet* settingsToUse, bool takeOwnershipOfSettings)
        : settings (settingsToUse, takeOwnershipOfSettings)
    {
        createPlugin();
        setupAudioDevices();
        reloadPluginState();
        startPlaying();
    }

    virtual ~StandalonePluginHolder()
    {
        deletePlugin();
        shutDownAudioDevices();
    }

    //==============================================================================
    virtual void createPlugin()
    {
        AudioProcessor::setTypeOfNextNewPlugin (AudioProcessor::wrapperType_Standalone);
        processor = createPluginFilter();
        jassert (processor != nullptr); // Your createPluginFilter() function must return a valid object!
        AudioProcessor::setTypeOfNextNewPlugin (AudioProcessor::wrapperType_Undefined);

        processor->setPlayConfigDetails (JucePlugin_MaxNumInputChannels,
                                         JucePlugin_MaxNumOutputChannels,
                                         44100, 512);
    }

    virtual void deletePlugin()
    {
        stopPlaying();
        processor = nullptr;
    }

    static String getFilePatterns (const String& fileSuffix)
    {
        if (fileSuffix.isEmpty())
            return String();

        return (fileSuffix.startsWithChar ('.') ? "*" : "*.") + fileSuffix;
    }


    //==============================================================================
    File getLastFile() const
    {
        File f;

        if (settings != nullptr)
            f = File (settings->getValue ("lastStateFile"));

        if (f == File::nonexistent)
            f = File::getSpecialLocation (File::userDocumentsDirectory);

        return f;
    }

    void setLastFile (const FileChooser& fc)
    {
        if (settings != nullptr)
            settings->setValue ("lastStateFile", fc.getResult().getFullPathName());
    }

    /** Pops up a dialog letting the user save the processor's state to a file. */
    void askUserToSaveState (const String& fileSuffix = String())
    {
        FileChooser fc (TRANS("Save current state"), getLastFile(), getFilePatterns (fileSuffix));

        if (fc.browseForFileToSave (true))
        {
            setLastFile (fc);

            MemoryBlock data;
            processor->getStateInformation (data);

            if (! fc.getResult().replaceWithData (data.getData(), data.getSize()))
                AlertWindow::showMessageBoxAsync (AlertWindow::WarningIcon,
                                                  TRANS("Error whilst saving"),
                                                  TRANS("Couldn't write to the specified file!"));
        }
    }

    /** Pops up a dialog letting the user re-load the processor's state from a file. */
    void askUserToLoadState (const String& fileSuffix = String())
    {
        FileChooser fc (TRANS("Load a saved state"), getLastFile(), getFilePatterns (fileSuffix));

        if (fc.browseForFileToOpen())
        {
            setLastFile (fc);

            MemoryBlock data;

            if (fc.getResult().loadFileAsData (data))
                processor->setStateInformation (data.getData(), (int) data.getSize());
            else
                AlertWindow::showMessageBoxAsync (AlertWindow::WarningIcon,
                                                  TRANS("Error whilst loading"),
                                                  TRANS("Couldn't read from the specified file!"));
        }
    }

    //==============================================================================
    void startPlaying()
    {
        player.setProcessor (processor);
    }

    void stopPlaying()
    {
        player.setProcessor (nullptr);
    }

    //==============================================================================
    /** Shows an audio properties dialog box modally. */
    void showAudioSettingsDialog()
    {
        DialogWindow::LaunchOptions o;
        o.content.setOwned (new AudioDeviceSelectorComponent (deviceManager,
                                                              processor->getNumInputChannels(),
                                                              processor->getNumInputChannels(),
                                                              processor->getNumOutputChannels(),
                                                              processor->getNumOutputChannels(),
                                                              true, false,
                                                              true, false));
        o.content->setSize (500, 450);

        o.dialogTitle                   = TRANS("Audio Settings");
        o.dialogBackgroundColour        = Colour (0xfff0f0f0);
        o.escapeKeyTriggersCloseButton  = true;
        o.useNativeTitleBar             = true;
        o.resizable                     = false;

        o.launchAsync();
    }

    void saveAudioDeviceState()
    {
        if (settings != nullptr)
        {
            ScopedPointer<XmlElement> xml (deviceManager.createStateXml());
            settings->setValue ("audioSetup", xml);
        }
    }

    void reloadAudioDeviceState()
    {
        ScopedPointer<XmlElement> savedState;

        if (settings != nullptr)
            savedState = settings->getXmlValue ("audioSetup");

        deviceManager.initialise (processor->getNumInputChannels(),
                                  processor->getNumOutputChannels(),
                                  savedState,
                                  true);
    }

    //==============================================================================
    void savePluginState()
    {
        if (settings != nullptr && processor != nullptr)
        {
            MemoryBlock data;
            processor->getStateInformation (data);

            settings->setValue ("filterState", data.toBase64Encoding());
        }
    }

    void reloadPluginState()
    {
        if (settings != nullptr)
        {
            MemoryBlock data;

            if (data.fromBase64Encoding (settings->getValue ("filterState")) && data.getSize() > 0)
                processor->setStateInformation (data.getData(), (int) data.getSize());
        }
    }

    //==============================================================================
    OptionalScopedPointer<PropertySet> settings;
    ScopedPointer<AudioProcessor> processor;
    AudioDeviceManager deviceManager;
    AudioProcessorPlayer player;

private:
    void setupAudioDevices()
    {
        deviceManager.addAudioCallback (&player);
        deviceManager.addMidiInputCallback (String::empty, &player);

        reloadAudioDeviceState();
    }

    void shutDownAudioDevices()
    {
        saveAudioDeviceState();

        deviceManager.removeMidiInputCallback (String::empty, &player);
        deviceManager.removeAudioCallback (&player);
    }

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (StandalonePluginHolder)
};


//==============================================================================
/**
    A class that can be used to run a simple standalone application containing your filter.

    Just create one of these objects in your JUCEApplicationBase::initialise() method, and
    let it do its work. It will create your filter object using the same createPluginFilter() function
    that the other plugin wrappers use.
*/
class StandaloneFilterWindow    : public DocumentWindow,
                                  public ButtonListener   // (can't use Button::Listener due to VC2005 bug)
{
public:
    //==============================================================================
    /** Creates a window with a given title and colour.
        The settings object can be a PropertySet that the class should use to
        store its settings (it can also be null). If takeOwnershipOfSettings is
        true, then the settings object will be owned and deleted by this object.
    */
    StandaloneFilterWindow (const String& title,
                            Colour backgroundColour,
                            PropertySet* settingsToUse,
                            bool takeOwnershipOfSettings)
        : DocumentWindow (title, backgroundColour, DocumentWindow::minimiseButton | DocumentWindow::closeButton),
          optionsButton ("options")
    {
        setTitleBarButtonsRequired (DocumentWindow::minimiseButton | DocumentWindow::closeButton, false);

        Component::addAndMakeVisible (optionsButton);
        optionsButton.addListener (this);
        optionsButton.setTriggeredOnMouseDown (true);

        pluginHolder = new StandalonePluginHolder (settingsToUse, takeOwnershipOfSettings);

        createEditorComp();

        if (PropertySet* props = pluginHolder->settings)
        {
            const int x = props->getIntValue ("windowX", -100);
            const int y = props->getIntValue ("windowY", -100);

            if (x != -100 && y != -100)
                setBoundsConstrained (juce::Rectangle<int> (x, y, getWidth(), getHeight()));
            else
                centreWithSize (getWidth(), getHeight());
        }
        else
        {
            centreWithSize (getWidth(), getHeight());
        }
    }

    ~StandaloneFilterWindow()
    {
        if (PropertySet* props = pluginHolder->settings)
        {
            props->setValue ("windowX", getX());
            props->setValue ("windowY", getY());
        }

        pluginHolder->stopPlaying();
        deleteEditorComp();
        pluginHolder = nullptr;
    }

    //==============================================================================
    AudioProcessor* getAudioProcessor() const noexcept      { return pluginHolder->processor; }
    AudioDeviceManager& getDeviceManager() const noexcept   { return pluginHolder->deviceManager; }

    void createEditorComp()
    {
        setContentOwned (getAudioProcessor()->createEditorIfNeeded(), true);
    }

    void deleteEditorComp()
    {
        if (AudioProcessorEditor* ed = dynamic_cast<AudioProcessorEditor*> (getContentComponent()))
        {
            pluginHolder->processor->editorBeingDeleted (ed);
            clearContentComponent();
        }
    }

    /** Deletes and re-creates the plugin, resetting it to its default state. */
    void resetToDefaultState()
    {
        pluginHolder->stopPlaying();
        deleteEditorComp();
        pluginHolder->deletePlugin();

        if (PropertySet* props = pluginHolder->settings)
            props->removeValue ("filterState");

        pluginHolder->createPlugin();
        createEditorComp();
        pluginHolder->startPlaying();
    }

    //==============================================================================
    void closeButtonPressed() override
    {
        JUCEApplicationBase::quit();
    }

    void buttonClicked (Button*) override
    {
        PopupMenu m;
        m.addItem (1, TRANS("Audio Settings..."));
        m.addSeparator();
        m.addItem (2, TRANS("Save current state..."));
        m.addItem (3, TRANS("Load a saved state..."));
        m.addSeparator();
        m.addItem (4, TRANS("Reset to default state"));

        m.showMenuAsync (PopupMenu::Options(),
                         ModalCallbackFunction::forComponent (menuCallback, this));
    }

    void handleMenuResult (int result)
    {
        switch (result)
        {
            case 1:  pluginHolder->showAudioSettingsDialog(); break;
            case 2:  pluginHolder->askUserToSaveState(); break;
            case 3:  pluginHolder->askUserToLoadState(); break;
            case 4:  resetToDefaultState(); break;
            default: break;
        }
    }

    static void menuCallback (int result, StandaloneFilterWindow* button)
    {
        if (button != nullptr && result != 0)
            button->handleMenuResult (result);
    }

    void resized() override
    {
        DocumentWindow::resized();
        optionsButton.setBounds (8, 6, 60, getTitleBarHeight() - 8);
    }

    ScopedPointer<StandalonePluginHolder> pluginHolder;

private:
    //==============================================================================
    TextButton optionsButton;

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (StandaloneFilterWindow)
};


#endif   // JUCE_STANDALONEFILTERWINDOW_H_INCLUDED
