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

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

   JUCE is an open source framework subject to commercial or open source
   licensing.

   By downloading, installing, or using the JUCE framework, or combining the
   JUCE framework with any other source code, object code, content or any other
   copyrightable work, you agree to the terms of the JUCE End User Licence
   Agreement, and all incorporated terms including the JUCE Privacy Policy and
   the JUCE Website Terms of Service, as applicable, which will bind you. If you
   do not agree to the terms of these agreements, we will not license the JUCE
   framework to you, and you must discontinue the installation or download
   process and cease use of the JUCE framework.

   JUCE End User Licence Agreement: https://juce.com/legal/juce-8-licence/
   JUCE Privacy Policy: https://juce.com/juce-privacy-policy
   JUCE Website Terms of Service: https://juce.com/juce-website-terms-of-service/

   Or:

   You may also use this code under the terms of the AGPLv3:
   https://www.gnu.org/licenses/agpl-3.0.en.html

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

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

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

static std::unique_ptr<ScopedDPIAwarenessDisabler> makeDPIAwarenessDisablerForPlugin (const PluginDescription& desc)
{
    return shouldAutoScalePlugin (desc) ? std::make_unique<ScopedDPIAwarenessDisabler>()
                                        : nullptr;
}

//==============================================================================
PluginGraph::PluginGraph (AudioPluginFormatManager& fm, KnownPluginList& kpl)
    : FileBasedDocument (getFilenameSuffix(),
                         getFilenameWildcard(),
                         "Load a graph",
                         "Save a graph"),
      formatManager (fm),
      knownPlugins (kpl)
{
    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 PluginDescriptionAndPreference& desc, Point<double> pos)
{
    std::shared_ptr<ScopedDPIAwarenessDisabler> dpiDisabler = makeDPIAwarenessDisablerForPlugin (desc.pluginDescription);

    formatManager.createPluginInstanceAsync (desc.pluginDescription,
                                             graph.getSampleRate(),
                                             graph.getBlockSize(),
                                             [this, pos, dpiDisabler, useARA = desc.useARA] (std::unique_ptr<AudioPluginInstance> instance, const String& error)
                                             {
                                                 addPluginCallback (std::move (instance), error, pos, useARA);
                                             });
}

void PluginGraph::addPluginCallback (std::unique_ptr<AudioPluginInstance> instance,
                                     const String& error,
                                     Point<double> pos,
                                     PluginDescriptionAndPreference::UseARA useARA)
{
    if (instance == nullptr)
    {
        auto options = MessageBoxOptions::makeOptionsOk (MessageBoxIconType::WarningIcon,
                                                         TRANS ("Couldn't create plugin"),
                                                         error);
        messageBox = AlertWindow::showScopedAsync (options, nullptr);
    }
    else
    {
       #if JUCE_PLUGINHOST_ARA && (JUCE_MAC || JUCE_WINDOWS || JUCE_LINUX)
        if (useARA == PluginDescriptionAndPreference::UseARA::yes
            && instance->getPluginDescription().hasARAExtension)
        {
            instance = std::make_unique<ARAPluginInstanceWrapper> (std::move (instance));
        }
       #endif

        instance->enableAllBuses();

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

            auto localDpiDisabler = makeDPIAwarenessDisablerForPlugin (description);
            return activePluginWindows.add (new PluginWindow (node,
                                                              type,
                                                              activePluginWindows,
                                                              getCommandManager().getKeyMappings()));
        }
    }

    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 (PluginDescriptionAndPreference { internalFormat.getAllTypes()[0] }, { 0.5,  0.1 });
    addPlugin (PluginDescriptionAndPreference { internalFormat.getAllTypes()[1] }, { 0.25, 0.1 });
    addPlugin (PluginDescriptionAndPreference { internalFormat.getAllTypes()[2] }, { 0.5,  0.9 });
    addPlugin (PluginDescriptionAndPreference { 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"))
    {
        for (auto* e : buses->getChildWithTagNameIterator ("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());
        e->setAttribute ("useARA",   node->properties ["useARA"].toString());

        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)
{
    PluginDescriptionAndPreference pd;
    const auto nodeUsesARA = xml.getBoolAttribute ("useARA");

    for (auto* e : xml.getChildIterator())
    {
        if (pd.pluginDescription.loadFromXml (*e))
        {
            pd.useARA = nodeUsesARA ? PluginDescriptionAndPreference::UseARA::yes
                                    : PluginDescriptionAndPreference::UseARA::no;
            break;
        }
    }

    auto createInstanceWithFallback = [&]() -> std::unique_ptr<AudioPluginInstance>
    {
        auto createInstance = [this] (const PluginDescriptionAndPreference& description) -> std::unique_ptr<AudioPluginInstance>
        {
            String errorMessage;

            auto localDpiDisabler = makeDPIAwarenessDisablerForPlugin (description.pluginDescription);

            auto instance = formatManager.createPluginInstance (description.pluginDescription,
                                                                graph.getSampleRate(),
                                                                graph.getBlockSize(),
                                                                errorMessage);

           #if JUCE_PLUGINHOST_ARA && (JUCE_MAC || JUCE_WINDOWS || JUCE_LINUX)
            if (instance
                && description.useARA == PluginDescriptionAndPreference::UseARA::yes
                && description.pluginDescription.hasARAExtension)
            {
                return std::make_unique<ARAPluginInstanceWrapper> (std::move (instance));
            }
           #endif

            return instance;
        };

        if (auto instance = createInstance (pd))
            return instance;

        const auto allFormats = formatManager.getFormats();
        const auto matchingFormat = std::find_if (allFormats.begin(), allFormats.end(),
                                                  [&] (const AudioPluginFormat* f) { return f->getName() == pd.pluginDescription.pluginFormatName; });

        if (matchingFormat == allFormats.end())
            return nullptr;

        const auto plugins = knownPlugins.getTypesForFormat (**matchingFormat);
        const auto matchingPlugin = std::find_if (plugins.begin(), plugins.end(),
                                                  [&] (const PluginDescription& desc) { return pd.pluginDescription.uniqueId == desc.uniqueId; });

        if (matchingPlugin == plugins.end())
            return nullptr;

        return createInstance (PluginDescriptionAndPreference { *matchingPlugin });
    };

    if (auto instance = createInstanceWithFallback())
    {
        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"));
            node->properties.set ("useARA", xml.getBoolAttribute ("useARA"));

            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();

    for (auto* e : xml.getChildWithTagNameIterator ("FILTER"))
    {
        createNodeFromXml (*e);
        changed();
    }

    for (auto* e : xml.getChildWithTagNameIterator ("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");
}
