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

   This file is part of the JUCE 6 technical preview.
   Copyright (c) 2017 - ROLI Ltd.

   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/MainHostWindow.h"
#include "PluginGraph.h"
#include "InternalPlugins.h"
#include "../UI/GraphEditorPanel.h"


//==============================================================================
PluginGraph::PluginGraph (AudioPluginFormatManager& fm)
    : FileBasedDocument (getFilenameSuffix(),
                         getFilenameWildcard(),
                         "Load a graph",
                         "Save a graph"),
      formatManager (fm)
{
    newDocument();
    graph.addListener (this);
}

PluginGraph::~PluginGraph()
{
    graph.removeListener (this);
    graph.removeChangeListener (this);
    graph.clear();
}

PluginGraph::NodeID PluginGraph::getNextUID() noexcept
{
    return PluginGraph::NodeID (++(lastUID.uid));
}

//==============================================================================
void PluginGraph::changeListenerCallback (ChangeBroadcaster*)
{
    changed();

    for (int i = activePluginWindows.size(); --i >= 0;)
        if (! graph.getNodes().contains (activePluginWindows.getUnchecked(i)->node))
            activePluginWindows.remove (i);
}

AudioProcessorGraph::Node::Ptr PluginGraph::getNodeForName (const String& name) const
{
    for (auto* node : graph.getNodes())
        if (auto p = node->getProcessor())
            if (p->getName().equalsIgnoreCase (name))
                return node;

    return nullptr;
}

void PluginGraph::addPlugin (const PluginDescription& desc, Point<double> pos)
{
    formatManager.createPluginInstanceAsync (desc,
                                             graph.getSampleRate(),
                                             graph.getBlockSize(),
                                             [this, pos] (std::unique_ptr<AudioPluginInstance> instance, const String& error)
                                             {
                                                 addPluginCallback (std::move (instance), error, pos);
                                             });
}

void PluginGraph::addPluginCallback (std::unique_ptr<AudioPluginInstance> instance,
                                     const String& error, Point<double> pos)
{
    if (instance == nullptr)
    {
        AlertWindow::showMessageBoxAsync (AlertWindow::WarningIcon,
                                          TRANS("Couldn't create plugin"),
                                          error);
    }
    else
    {
        instance->enableAllBuses();

        if (auto node = graph.addNode (std::move (instance)))
        {
            node->properties.set ("x", pos.x);
            node->properties.set ("y", pos.y);
            changed();
        }
    }
}

void PluginGraph::setNodePosition (NodeID nodeID, Point<double> pos)
{
    if (auto* n = graph.getNodeForId (nodeID))
    {
        n->properties.set ("x", jlimit (0.0, 1.0, pos.x));
        n->properties.set ("y", jlimit (0.0, 1.0, pos.y));
    }
}

Point<double> PluginGraph::getNodePosition (NodeID nodeID) const
{
    if (auto* n = graph.getNodeForId (nodeID))
        return { static_cast<double> (n->properties ["x"]),
                 static_cast<double> (n->properties ["y"]) };

    return {};
}

//==============================================================================
void PluginGraph::clear()
{
    closeAnyOpenPluginWindows();
    graph.clear();
    changed();
}

PluginWindow* PluginGraph::getOrCreateWindowFor (AudioProcessorGraph::Node* node, PluginWindow::Type type)
{
    jassert (node != nullptr);

   #if JUCE_IOS || JUCE_ANDROID
    closeAnyOpenPluginWindows();
   #else
    for (auto* w : activePluginWindows)
        if (w->node.get() == node && w->type == type)
            return w;
   #endif

    if (auto* processor = node->getProcessor())
    {
        if (auto* plugin = dynamic_cast<AudioPluginInstance*> (processor))
        {
            auto description = plugin->getPluginDescription();

            if (! plugin->hasEditor() && description.pluginFormatName == "Internal")
            {
                getCommandManager().invokeDirectly (CommandIDs::showAudioSettings, false);
                return nullptr;
            }
        }

       #if JUCE_WINDOWS && JUCE_WIN_PER_MONITOR_DPI_AWARE
        if (! node->properties["DPIAware"]
            && ! node->getProcessor()->getName().contains ("Kontakt")) // Kontakt doesn't behave correctly in DPI unaware mode...
        {
            ScopedDPIAwarenessDisabler disableDPIAwareness;
            return activePluginWindows.add (new PluginWindow (node, type, activePluginWindows));
        }
       #endif

        return activePluginWindows.add (new PluginWindow (node, type, activePluginWindows));
    }

    return nullptr;
}

bool PluginGraph::closeAnyOpenPluginWindows()
{
    bool wasEmpty = activePluginWindows.isEmpty();
    activePluginWindows.clear();
    return ! wasEmpty;
}

//==============================================================================
String PluginGraph::getDocumentTitle()
{
    if (! getFile().exists())
        return "Unnamed";

    return getFile().getFileNameWithoutExtension();
}

void PluginGraph::newDocument()
{
    clear();
    setFile ({});

    graph.removeChangeListener (this);

    InternalPluginFormat internalFormat;

    jassert (internalFormat.getAllTypes().size() > 3);

    addPlugin (internalFormat.getAllTypes()[0], { 0.5,  0.1 });
    addPlugin (internalFormat.getAllTypes()[1], { 0.25, 0.1 });
    addPlugin (internalFormat.getAllTypes()[2], { 0.5,  0.9 });
    addPlugin (internalFormat.getAllTypes()[3], { 0.25, 0.9 });

    MessageManager::callAsync ([this]
    {
        setChangedFlag (false);
        graph.addChangeListener (this);
    });
}

Result PluginGraph::loadDocument (const File& file)
{
    if (auto xml = parseXMLIfTagMatches (file, "FILTERGRAPH"))
    {
        graph.removeChangeListener (this);
        restoreFromXml (*xml);

        MessageManager::callAsync ([this]
        {
            setChangedFlag (false);
            graph.addChangeListener (this);
        });

        return Result::ok();
    }

    return Result::fail ("Not a valid graph file");
}

Result PluginGraph::saveDocument (const File& file)
{
    auto xml = createXml();

    if (! xml->writeTo (file, {}))
        return Result::fail ("Couldn't write to the file");

    return Result::ok();
}

File PluginGraph::getLastDocumentOpened()
{
    RecentlyOpenedFilesList recentFiles;
    recentFiles.restoreFromString (getAppProperties().getUserSettings()
                                        ->getValue ("recentFilterGraphFiles"));

    return recentFiles.getFile (0);
}

void PluginGraph::setLastDocumentOpened (const File& file)
{
    RecentlyOpenedFilesList recentFiles;
    recentFiles.restoreFromString (getAppProperties().getUserSettings()
                                        ->getValue ("recentFilterGraphFiles"));

    recentFiles.addFile (file);

    getAppProperties().getUserSettings()
        ->setValue ("recentFilterGraphFiles", recentFiles.toString());
}

//==============================================================================
static void readBusLayoutFromXml (AudioProcessor::BusesLayout& busesLayout, AudioProcessor& plugin,
                                  const XmlElement& xml, bool isInput)
{
    auto& targetBuses = (isInput ? busesLayout.inputBuses
                                 : busesLayout.outputBuses);
    int maxNumBuses = 0;

    if (auto* buses = xml.getChildByName (isInput ? "INPUTS" : "OUTPUTS"))
    {
        forEachXmlChildElementWithTagName (*buses, e, "BUS")
        {
            const int busIdx = e->getIntAttribute ("index");
            maxNumBuses = jmax (maxNumBuses, busIdx + 1);

            // the number of buses on busesLayout may not be in sync with the plugin after adding buses
            // because adding an input bus could also add an output bus
            for (int actualIdx = plugin.getBusCount (isInput) - 1; actualIdx < busIdx; ++actualIdx)
                if (! plugin.addBus (isInput))
                    return;

            for (int actualIdx = targetBuses.size() - 1; actualIdx < busIdx; ++actualIdx)
                targetBuses.add (plugin.getChannelLayoutOfBus (isInput, busIdx));

            auto layout = e->getStringAttribute ("layout");

            if (layout.isNotEmpty())
                targetBuses.getReference (busIdx) = AudioChannelSet::fromAbbreviatedString (layout);
        }
    }

    // if the plugin has more buses than specified in the xml, then try to remove them!
    while (maxNumBuses < targetBuses.size())
    {
        if (! plugin.removeBus (isInput))
            return;

        targetBuses.removeLast();
    }
}

//==============================================================================
static XmlElement* createBusLayoutXml (const AudioProcessor::BusesLayout& layout, const bool isInput)
{
    auto& buses = isInput ? layout.inputBuses
                          : layout.outputBuses;

    auto* xml = new XmlElement (isInput ? "INPUTS" : "OUTPUTS");

    for (int busIdx = 0; busIdx < buses.size(); ++busIdx)
    {
        auto& set = buses.getReference (busIdx);

        auto* bus = xml->createNewChildElement ("BUS");
        bus->setAttribute ("index", busIdx);
        bus->setAttribute ("layout", set.isDisabled() ? "disabled" : set.getSpeakerArrangementAsString());
    }

    return xml;
}

static XmlElement* createNodeXml (AudioProcessorGraph::Node* const node) noexcept
{
    if (auto* plugin = dynamic_cast<AudioPluginInstance*> (node->getProcessor()))
    {
        auto e = new XmlElement ("FILTER");

        e->setAttribute ("uid",      (int) node->nodeID.uid);
        e->setAttribute ("x",        node->properties ["x"].toString());
        e->setAttribute ("y",        node->properties ["y"].toString());
       #if JUCE_WINDOWS && JUCE_WIN_PER_MONITOR_DPI_AWARE
        e->setAttribute ("DPIAware", node->properties["DPIAware"].toString());
       #endif

        for (int i = 0; i < (int) PluginWindow::Type::numTypes; ++i)
        {
            auto type = (PluginWindow::Type) i;

            if (node->properties.contains (PluginWindow::getOpenProp (type)))
            {
                e->setAttribute (PluginWindow::getLastXProp (type), node->properties[PluginWindow::getLastXProp (type)].toString());
                e->setAttribute (PluginWindow::getLastYProp (type), node->properties[PluginWindow::getLastYProp (type)].toString());
                e->setAttribute (PluginWindow::getOpenProp (type),  node->properties[PluginWindow::getOpenProp (type)].toString());
            }
        }

        {
            PluginDescription pd;
            plugin->fillInPluginDescription (pd);
            e->addChildElement (pd.createXml().release());
        }

        {
            MemoryBlock m;
            node->getProcessor()->getStateInformation (m);
            e->createNewChildElement ("STATE")->addTextElement (m.toBase64Encoding());
        }

        auto layout = plugin->getBusesLayout();

        auto layouts = e->createNewChildElement ("LAYOUT");
        layouts->addChildElement (createBusLayoutXml (layout, true));
        layouts->addChildElement (createBusLayoutXml (layout, false));

        return e;
    }

    jassertfalse;
    return nullptr;
}

void PluginGraph::createNodeFromXml (const XmlElement& xml)
{
    PluginDescription pd;

    forEachXmlChildElement (xml, e)
    {
        if (pd.loadFromXml (*e))
            break;
    }

    String errorMessage;

    if (auto instance = formatManager.createPluginInstance (pd, graph.getSampleRate(),
                                                            graph.getBlockSize(), errorMessage))
    {
        if (auto* layoutEntity = xml.getChildByName ("LAYOUT"))
        {
            auto layout = instance->getBusesLayout();

            readBusLayoutFromXml (layout, *instance, *layoutEntity, true);
            readBusLayoutFromXml (layout, *instance, *layoutEntity, false);

            instance->setBusesLayout (layout);
        }

        if (auto node = graph.addNode (std::move (instance), NodeID ((uint32) xml.getIntAttribute ("uid"))))
        {
            if (auto* state = xml.getChildByName ("STATE"))
            {
                MemoryBlock m;
                m.fromBase64Encoding (state->getAllSubText());

                node->getProcessor()->setStateInformation (m.getData(), (int) m.getSize());
            }

            node->properties.set ("x",        xml.getDoubleAttribute ("x"));
            node->properties.set ("y",        xml.getDoubleAttribute ("y"));
           #if JUCE_WINDOWS && JUCE_WIN_PER_MONITOR_DPI_AWARE
            node->properties.set ("DPIAware", xml.getDoubleAttribute ("DPIAware"));
           #endif

            for (int i = 0; i < (int) PluginWindow::Type::numTypes; ++i)
            {
                auto type = (PluginWindow::Type) i;

                if (xml.hasAttribute (PluginWindow::getOpenProp (type)))
                {
                    node->properties.set (PluginWindow::getLastXProp (type), xml.getIntAttribute (PluginWindow::getLastXProp (type)));
                    node->properties.set (PluginWindow::getLastYProp (type), xml.getIntAttribute (PluginWindow::getLastYProp (type)));
                    node->properties.set (PluginWindow::getOpenProp  (type), xml.getIntAttribute (PluginWindow::getOpenProp (type)));

                    if (node->properties[PluginWindow::getOpenProp (type)])
                    {
                        jassert (node->getProcessor() != nullptr);

                        if (auto w = getOrCreateWindowFor (node, type))
                            w->toFront (true);
                    }
                }
            }
        }
    }
}

std::unique_ptr<XmlElement> PluginGraph::createXml() const
{
    auto xml = std::make_unique<XmlElement> ("FILTERGRAPH");

    for (auto* node : graph.getNodes())
        xml->addChildElement (createNodeXml (node));

    for (auto& connection : graph.getConnections())
    {
        auto e = xml->createNewChildElement ("CONNECTION");

        e->setAttribute ("srcFilter", (int) connection.source.nodeID.uid);
        e->setAttribute ("srcChannel", connection.source.channelIndex);
        e->setAttribute ("dstFilter", (int) connection.destination.nodeID.uid);
        e->setAttribute ("dstChannel", connection.destination.channelIndex);
    }

    return xml;
}

void PluginGraph::restoreFromXml (const XmlElement& xml)
{
    clear();

    forEachXmlChildElementWithTagName (xml, e, "FILTER")
    {
        createNodeFromXml (*e);
        changed();
    }

    forEachXmlChildElementWithTagName (xml, e, "CONNECTION")
    {
        graph.addConnection ({ { NodeID ((uint32) e->getIntAttribute ("srcFilter")), e->getIntAttribute ("srcChannel") },
                               { NodeID ((uint32) e->getIntAttribute ("dstFilter")), e->getIntAttribute ("dstChannel") } });
    }

    graph.removeIllegalConnections();
}

File PluginGraph::getDefaultGraphDocumentOnMobile()
{
    auto persistantStorageLocation = File::getSpecialLocation (File::userApplicationDataDirectory);
    return persistantStorageLocation.getChildFile ("state.filtergraph");
}