ComponentList.cpp

/* Copyright 2013-2019 MultiMC Contributors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <QFile>
#include <QCryptographicHash>
#include <Version.h>
#include <QDir>
#include <QJsonDocument>
#include <QJsonArray>
#include <QDebug>

#include "Exception.h"
#include <minecraft/OneSixVersionFormat.h>
#include <FileSystem.h>
#include <QSaveFile>
#include <Env.h>
#include <meta/Index.h>
#include <minecraft/MinecraftInstance.h>
#include <QUuid>
#include <QTimer>
#include <Json.h>

#include "ComponentList.h"
#include "ComponentList_p.h"
#include "ComponentUpdateTask.h"

ComponentList::ComponentList(MinecraftInstance * instance)
    : QAbstractListModel()
{
    d.reset(new ComponentListData);
    d->m_instance = instance;
    d->m_saveTimer.setSingleShot(true);
    d->m_saveTimer.setInterval(5000);
    connect(&d->m_saveTimer, &QTimer::timeout, this, &ComponentList::save_internal);
}

ComponentList::~ComponentList()
{
    saveNow();
}

// BEGIN: component file format

static const int currentComponentsFileVersion = 1;

static QJsonObject componentToJsonV1(ComponentPtr component)
{
    QJsonObject obj;
    // critical
    obj.insert("uid", component->m_uid);
    if(!component->m_version.isEmpty())
    {
        obj.insert("version", component->m_version);
    }
    if(component->m_dependencyOnly)
    {
        obj.insert("dependencyOnly", true);
    }
    if(component->m_important)
    {
        obj.insert("important", true);
    }
    if(component->m_disabled)
    {
        obj.insert("disabled", true);
    }

    // cached
    if(!component->m_cachedVersion.isEmpty())
    {
        obj.insert("cachedVersion", component->m_cachedVersion);
    }
    if(!component->m_cachedName.isEmpty())
    {
        obj.insert("cachedName", component->m_cachedName);
    }
    Meta::serializeRequires(obj, &component->m_cachedRequires, "cachedRequires");
    Meta::serializeRequires(obj, &component->m_cachedConflicts, "cachedConflicts");
    if(component->m_cachedVolatile)
    {
        obj.insert("cachedVolatile", true);
    }
    return obj;
}

static ComponentPtr componentFromJsonV1(ComponentList * parent, const QString & componentJsonPattern, const QJsonObject &obj)
{
    // critical
    auto uid = Json::requireString(obj.value("uid"));
    auto filePath = componentJsonPattern.arg(uid);
    auto component = new Component(parent, uid);
    component->m_version = Json::ensureString(obj.value("version"));
    component->m_dependencyOnly = Json::ensureBoolean(obj.value("dependencyOnly"), false);
    component->m_important = Json::ensureBoolean(obj.value("important"), false);

    // cached
    // TODO @RESILIENCE: ignore invalid values/structure here?
    component->m_cachedVersion = Json::ensureString(obj.value("cachedVersion"));
    component->m_cachedName = Json::ensureString(obj.value("cachedName"));
    Meta::parseRequires(obj, &component->m_cachedRequires, "cachedRequires");
    Meta::parseRequires(obj, &component->m_cachedConflicts, "cachedConflicts");
    component->m_cachedVolatile = Json::ensureBoolean(obj.value("volatile"), false);
    bool disabled = Json::ensureBoolean(obj.value("disabled"), false);
    component->setEnabled(!disabled);
    return component;
}

// Save the given component container data to a file
static bool saveComponentList(const QString & filename, const ComponentContainer & container)
{
    QJsonObject obj;
    obj.insert("formatVersion", currentComponentsFileVersion);
    QJsonArray orderArray;
    for(auto component: container)
    {
        orderArray.append(componentToJsonV1(component));
    }
    obj.insert("components", orderArray);
    QSaveFile outFile(filename);
    if (!outFile.open(QFile::WriteOnly))
    {
        qCritical() << "Couldn't open" << outFile.fileName()
                     << "for writing:" << outFile.errorString();
        return false;
    }
    auto data = QJsonDocument(obj).toJson(QJsonDocument::Indented);
    if(outFile.write(data) != data.size())
    {
        qCritical() << "Couldn't write all the data into" << outFile.fileName()
                     << "because:" << outFile.errorString();
        return false;
    }
    if(!outFile.commit())
    {
        qCritical() << "Couldn't save" << outFile.fileName()
                     << "because:" << outFile.errorString();
    }
    return true;
}

// Read the given file into component containers
static bool loadComponentList(ComponentList * parent, const QString & filename, const QString & componentJsonPattern, ComponentContainer & container)
{
    QFile componentsFile(filename);
    if (!componentsFile.exists())
    {
        qWarning() << "Components file doesn't exist. This should never happen.";
        return false;
    }
    if (!componentsFile.open(QFile::ReadOnly))
    {
        qCritical() << "Couldn't open" << componentsFile.fileName()
                     << " for reading:" << componentsFile.errorString();
        qWarning() << "Ignoring overriden order";
        return false;
    }

    // and it's valid JSON
    QJsonParseError error;
    QJsonDocument doc = QJsonDocument::fromJson(componentsFile.readAll(), &error);
    if (error.error != QJsonParseError::NoError)
    {
        qCritical() << "Couldn't parse" << componentsFile.fileName() << ":" << error.errorString();
        qWarning() << "Ignoring overriden order";
        return false;
    }

    // and then read it and process it if all above is true.
    try
    {
        auto obj = Json::requireObject(doc);
        // check order file version.
        auto version = Json::requireInteger(obj.value("formatVersion"));
        if (version != currentComponentsFileVersion)
        {
            throw JSONValidationError(QObject::tr("Invalid component file version, expected %1")
                                          .arg(currentComponentsFileVersion));
        }
        auto orderArray = Json::requireArray(obj.value("components"));
        for(auto item: orderArray)
        {
            auto obj = Json::requireObject(item, "Component must be an object.");
            container.append(componentFromJsonV1(parent, componentJsonPattern, obj));
        }
    }
    catch (const JSONValidationError &err)
    {
        qCritical() << "Couldn't parse" << componentsFile.fileName() << ": bad file format";
        container.clear();
        return false;
    }
    return true;
}

// END: component file format

// BEGIN: save/load logic

void ComponentList::saveNow()
{
    if(saveIsScheduled())
    {
        d->m_saveTimer.stop();
        save_internal();
    }
}

bool ComponentList::saveIsScheduled() const
{
    return d->dirty;
}

void ComponentList::buildingFromScratch()
{
    d->loaded = true;
    d->dirty = true;
}

void ComponentList::scheduleSave()
{
    if(!d->loaded)
    {
        qDebug() << "Component list should never save if it didn't successfully load, instance:" << d->m_instance->name();
        return;
    }
    if(!d->dirty)
    {
        d->dirty = true;
        qDebug() << "Component list save is scheduled for" << d->m_instance->name();
    }
    d->m_saveTimer.start();
}

QString ComponentList::componentsFilePath() const
{
    return FS::PathCombine(d->m_instance->instanceRoot(), "mmc-pack.json");
}

QString ComponentList::patchesPattern() const
{
    return FS::PathCombine(d->m_instance->instanceRoot(), "patches", "%1.json");
}

QString ComponentList::patchFilePathForUid(const QString& uid) const
{
    return patchesPattern().arg(uid);
}

void ComponentList::save_internal()
{
    qDebug() << "Component list save performed now for" << d->m_instance->name();
    auto filename = componentsFilePath();
    saveComponentList(filename, d->components);
    d->dirty = false;
}

bool ComponentList::load()
{
    auto filename = componentsFilePath();
    QFile componentsFile(filename);

    // migrate old config to new one, if needed
    if(!componentsFile.exists())
    {
        if(!migratePreComponentConfig())
        {
            // FIXME: the user should be notified...
            qCritical() << "Failed to convert old pre-component config for instance" << d->m_instance->name();
            return false;
        }
    }

    // load the new component list and swap it with the current one...
    ComponentContainer newComponents;
    if(!loadComponentList(this, filename, patchesPattern(), newComponents))
    {
        qCritical() << "Failed to load the component config for instance" << d->m_instance->name();
        return false;
    }
    else
    {
        // FIXME: actually use fine-grained updates, not this...
        beginResetModel();
        // disconnect all the old components
        for(auto component: d->components)
        {
            disconnect(component.get(), &Component::dataChanged, this, &ComponentList::componentDataChanged);
        }
        d->components.clear();
        d->componentIndex.clear();
        for(auto component: newComponents)
        {
            if(d->componentIndex.contains(component->m_uid))
            {
                qWarning() << "Ignoring duplicate component entry" << component->m_uid;
                continue;
            }
            connect(component.get(), &Component::dataChanged, this, &ComponentList::componentDataChanged);
            d->components.append(component);
            d->componentIndex[component->m_uid] = component;
        }
        endResetModel();
        d->loaded = true;
        return true;
    }
}

void ComponentList::reload(Net::Mode netmode)
{
    // Do not reload when the update/resolve task is running. It is in control.
    if(d->m_updateTask)
    {
        return;
    }

    // flush any scheduled saves to not lose state
    saveNow();

    // FIXME: differentiate when a reapply is required by propagating state from components
    invalidateLaunchProfile();

    if(load())
    {
        resolve(netmode);
    }
}

shared_qobject_ptr<Task> ComponentList::getCurrentTask()
{
    return d->m_updateTask;
}

void ComponentList::resolve(Net::Mode netmode)
{
    auto updateTask = new ComponentUpdateTask(ComponentUpdateTask::Mode::Resolution, netmode, this);
    d->m_updateTask.reset(updateTask);
    connect(updateTask, &ComponentUpdateTask::succeeded, this, &ComponentList::updateSucceeded);
    connect(updateTask, &ComponentUpdateTask::failed, this, &ComponentList::updateFailed);
    d->m_updateTask->start();
}


void ComponentList::updateSucceeded()
{
    qDebug() << "Component list update/resolve task succeeded for" << d->m_instance->name();
    d->m_updateTask.reset();
    invalidateLaunchProfile();
}

void ComponentList::updateFailed(const QString& error)
{
    qDebug() << "Component list update/resolve task failed for" << d->m_instance->name() << "Reason:" << error;
    d->m_updateTask.reset();
    invalidateLaunchProfile();
}

// NOTE this is really old stuff, and only needs to be used when loading the old hardcoded component-unaware format (loadPreComponentConfig).
static void upgradeDeprecatedFiles(QString root, QString instanceName)
{
    auto versionJsonPath = FS::PathCombine(root, "version.json");
    auto customJsonPath = FS::PathCombine(root, "custom.json");
    auto mcJson = FS::PathCombine(root, "patches" , "net.minecraft.json");

    QString sourceFile;
    QString renameFile;

    // convert old crap.
    if(QFile::exists(customJsonPath))
    {
        sourceFile = customJsonPath;
        renameFile = versionJsonPath;
    }
    else if(QFile::exists(versionJsonPath))
    {
        sourceFile = versionJsonPath;
    }
    if(!sourceFile.isEmpty() && !QFile::exists(mcJson))
    {
        if(!FS::ensureFilePathExists(mcJson))
        {
            qWarning() << "Couldn't create patches folder for" << instanceName;
            return;
        }
        if(!renameFile.isEmpty() && QFile::exists(renameFile))
        {
            if(!QFile::rename(renameFile, renameFile + ".old"))
            {
                qWarning() << "Couldn't rename" << renameFile << "to" << renameFile + ".old" << "in" << instanceName;
                return;
            }
        }
        auto file = ProfileUtils::parseJsonFile(QFileInfo(sourceFile), false);
        ProfileUtils::removeLwjglFromPatch(file);
        file->uid = "net.minecraft";
        file->version = file->minecraftVersion;
        file->name = "Minecraft";

        Meta::Require needsLwjgl;
        needsLwjgl.uid = "org.lwjgl";
        file->requires.insert(needsLwjgl);

        if(!ProfileUtils::saveJsonFile(OneSixVersionFormat::versionFileToJson(file), mcJson))
        {
            return;
        }
        if(!QFile::rename(sourceFile, sourceFile + ".old"))
        {
            qWarning() << "Couldn't rename" << sourceFile << "to" << sourceFile + ".old" << "in" << instanceName;
            return;
        }
    }
}

/*
 * Migrate old layout to the component based one...
 * - Part of the version information is taken from `instance.cfg` (fed to this class from outside).
 * - Part is taken from the old order.json file.
 * - Part is loaded from loose json files in the instance's `patches` directory.
 */
bool ComponentList::migratePreComponentConfig()
{
    // upgrade the very old files from the beginnings of MultiMC 5
    upgradeDeprecatedFiles(d->m_instance->instanceRoot(), d->m_instance->name());

    QList<ComponentPtr> components;
    QSet<QString> loaded;

    auto addBuiltinPatch = [&](const QString &uid, bool asDependency, const QString & emptyVersion, const Meta::Require & req, const Meta::Require & conflict)
    {
        auto jsonFilePath = FS::PathCombine(d->m_instance->instanceRoot(), "patches" , uid + ".json");
        auto intendedVersion = d->getOldConfigVersion(uid);
        // load up the base minecraft patch
        ComponentPtr component;
        if(QFile::exists(jsonFilePath))
        {
            if(intendedVersion.isEmpty())
            {
                intendedVersion = emptyVersion;
            }
            auto file = ProfileUtils::parseJsonFile(QFileInfo(jsonFilePath), false);
            // fix uid
            file->uid = uid;
            // if version is missing, add it from the outside.
            if(file->version.isEmpty())
            {
                file->version = intendedVersion;
            }
            // if this is a dependency (LWJGL), mark it also as volatile
            if(asDependency)
            {
                file->m_volatile = true;
            }
            // insert requirements if needed
            if(!req.uid.isEmpty())
            {
                file->requires.insert(req);
            }
            // insert conflicts if needed
            if(!conflict.uid.isEmpty())
            {
                file->conflicts.insert(conflict);
            }
            // FIXME: @QUALITY do not ignore return value
            ProfileUtils::saveJsonFile(OneSixVersionFormat::versionFileToJson(file), jsonFilePath);
            component = new Component(this, uid, file);
            component->m_version = intendedVersion;
        }
        else if(!intendedVersion.isEmpty())
        {
            auto metaVersion = ENV.metadataIndex()->get(uid, intendedVersion);
            component = new Component(this, metaVersion);
        }
        else
        {
            return;
        }
        component->m_dependencyOnly = asDependency;
        component->m_important = !asDependency;
        components.append(component);
    };
    // TODO: insert depends and conflicts here if these are customized files...
    Meta::Require reqLwjgl;
    reqLwjgl.uid = "org.lwjgl";
    reqLwjgl.suggests = "2.9.1";
    Meta::Require conflictLwjgl3;
    conflictLwjgl3.uid = "org.lwjgl3";
    Meta::Require nullReq;
    addBuiltinPatch("org.lwjgl", true, "2.9.1", nullReq, conflictLwjgl3);
    addBuiltinPatch("net.minecraft", false, QString(), reqLwjgl, nullReq);

    // first, collect all other file-based patches and load them
    QMap<QString, ComponentPtr> loadedComponents;
    QDir patchesDir(FS::PathCombine(d->m_instance->instanceRoot(),"patches"));
    for (auto info : patchesDir.entryInfoList(QStringList() << "*.json", QDir::Files))
    {
        // parse the file
        qDebug() << "Reading" << info.fileName();
        auto file = ProfileUtils::parseJsonFile(info, true);

        // correct missing or wrong uid based on the file name
        QString uid = info.completeBaseName();

        // ignore builtins, they've been handled already
        if (uid == "net.minecraft")
            continue;
        if (uid == "org.lwjgl")
            continue;

        // handle horrible corner cases
        if(uid.isEmpty())
        {
            // if you have a file named '.json', make it just go away.
            // FIXME: @QUALITY do not ignore return value
            QFile::remove(info.absoluteFilePath());
            continue;
        }
        file->uid = uid;
        // FIXME: @QUALITY do not ignore return value
        ProfileUtils::saveJsonFile(OneSixVersionFormat::versionFileToJson(file), info.absoluteFilePath());

        auto component = new Component(this, file->uid, file);
        auto version = d->getOldConfigVersion(file->uid);
        if(!version.isEmpty())
        {
            component->m_version = version;
        }
        loadedComponents[file->uid] = component;
    }
    // try to load the other 'hardcoded' patches (forge, liteloader), if they weren't loaded from files
    auto loadSpecial = [&](const QString & uid, int order)
    {
        auto patchVersion = d->getOldConfigVersion(uid);
        if(!patchVersion.isEmpty() && !loadedComponents.contains(uid))
        {
            auto patch = new Component(this, ENV.metadataIndex()->get(uid, patchVersion));
            patch->setOrder(order);
            loadedComponents[uid] = patch;
        }
    };
    loadSpecial("net.minecraftforge", 5);
    loadSpecial("com.mumfrey.liteloader", 10);

    // load the old order.json file, if present
    ProfileUtils::PatchOrder userOrder;
    ProfileUtils::readOverrideOrders(FS::PathCombine(d->m_instance->instanceRoot(), "order.json"), userOrder);

    // now add all the patches by user sort order
    for (auto uid : userOrder)
    {
        // ignore builtins
        if (uid == "net.minecraft")
            continue;
        if (uid == "org.lwjgl")
            continue;
        // ordering has a patch that is gone?
        if(!loadedComponents.contains(uid))
        {
            continue;
        }
        components.append(loadedComponents.take(uid));
    }

    // is there anything left to sort? - this is used when there are leftover components that aren't part of the order.json
    if(!loadedComponents.isEmpty())
    {
        // inserting into multimap by order number as key sorts the patches and detects duplicates
        QMultiMap<int, ComponentPtr> files;
        auto iter = loadedComponents.begin();
        while(iter != loadedComponents.end())
        {
            files.insert((*iter)->getOrder(), *iter);
            iter++;
        }

        // then just extract the patches and put them in the list
        for (auto order : files.keys())
        {
            const auto &values = files.values(order);
            for(auto &value: values)
            {
                // TODO: put back the insertion of problem messages here, so the user knows about the id duplication
                components.append(value);
            }
        }
    }
    // new we have a complete list of components...
    return saveComponentList(componentsFilePath(), components);
}

// END: save/load

void ComponentList::appendComponent(ComponentPtr component)
{
    insertComponent(d->components.size(), component);
}

void ComponentList::insertComponent(size_t index, ComponentPtr component)
{
    auto id = component->getID();
    if(id.isEmpty())
    {
        qWarning() << "Attempt to add a component with empty ID!";
        return;
    }
    if(d->componentIndex.contains(id))
    {
        qWarning() << "Attempt to add a component that is already present!";
        return;
    }
    beginInsertRows(QModelIndex(), index, index);
    d->components.insert(index, component);
    d->componentIndex[id] = component;
    endInsertRows();
    connect(component.get(), &Component::dataChanged, this, &ComponentList::componentDataChanged);
    scheduleSave();
}

void ComponentList::componentDataChanged()
{
    auto objPtr = qobject_cast<Component *>(sender());
    if(!objPtr)
    {
        qWarning() << "ComponentList got dataChenged signal from a non-Component!";
        return;
    }
    // figure out which one is it... in a seriously dumb way.
    int index = 0;
    for (auto component: d->components)
    {
        if(component.get() == objPtr)
        {
            emit dataChanged(createIndex(index, 0), createIndex(index, columnCount(QModelIndex()) - 1));
            scheduleSave();
            return;
        }
        index++;
    }
    qWarning() << "ComponentList got dataChenged signal from a Component which does not belong to it!";
}

bool ComponentList::remove(const int index)
{
    auto patch = getComponent(index);
    if (!patch->isRemovable())
    {
        qWarning() << "Patch" << patch->getID() << "is non-removable";
        return false;
    }

    if(!removeComponent_internal(patch))
    {
        qCritical() << "Patch" << patch->getID() << "could not be removed";
        return false;
    }

    beginRemoveRows(QModelIndex(), index, index);
    d->components.removeAt(index);
    d->componentIndex.remove(patch->getID());
    endRemoveRows();
    invalidateLaunchProfile();
    scheduleSave();
    return true;
}

bool ComponentList::remove(const QString id)
{
    int i = 0;
    for (auto patch : d->components)
    {
        if (patch->getID() == id)
        {
            return remove(i);
        }
        i++;
    }
    return false;
}

bool ComponentList::customize(int index)
{
    auto patch = getComponent(index);
    if (!patch->isCustomizable())
    {
        qDebug() << "Patch" << patch->getID() << "is not customizable";
        return false;
    }
    if(!patch->customize())
    {
        qCritical() << "Patch" << patch->getID() << "could not be customized";
        return false;
    }
    invalidateLaunchProfile();
    scheduleSave();
    return true;
}

bool ComponentList::revertToBase(int index)
{
    auto patch = getComponent(index);
    if (!patch->isRevertible())
    {
        qDebug() << "Patch" << patch->getID() << "is not revertible";
        return false;
    }
    if(!patch->revert())
    {
        qCritical() << "Patch" << patch->getID() << "could not be reverted";
        return false;
    }
    invalidateLaunchProfile();
    scheduleSave();
    return true;
}

Component * ComponentList::getComponent(const QString &id)
{
    auto iter = d->componentIndex.find(id);
    if (iter == d->componentIndex.end())
    {
        return nullptr;
    }
    return (*iter).get();
}

Component * ComponentList::getComponent(int index)
{
    if(index < 0 || index >= d->components.size())
    {
        return nullptr;
    }
    return d->components[index].get();
}

QVariant ComponentList::data(const QModelIndex &index, int role) const
{
    if (!index.isValid())
        return QVariant();

    int row = index.row();
    int column = index.column();

    if (row < 0 || row >= d->components.size())
        return QVariant();

    auto patch = d->components.at(row);

    switch (role)
    {
    case Qt::CheckStateRole:
    {
        switch (column)
        {
            case NameColumn:
                return d->components.at(row)->isEnabled() ? Qt::Checked : Qt::Unchecked;
            default:
                return QVariant();
        }
    }
    case Qt::DisplayRole:
    {
        switch (column)
        {
        case NameColumn:
            return d->components.at(row)->getName();
        case VersionColumn:
        {
            if(patch->isCustom())
            {
                return QString("%1 (Custom)").arg(patch->getVersion());
            }
            else
            {
                return patch->getVersion();
            }
        }
        default:
            return QVariant();
        }
    }
    case Qt::DecorationRole:
    {
        switch(column)
        {
        case NameColumn:
        {
            auto severity = patch->getProblemSeverity();
            switch (severity)
            {
                case ProblemSeverity::Warning:
                    return "warning";
                case ProblemSeverity::Error:
                    return "error";
                default:
                    return QVariant();
            }
        }
        default:
        {
            return QVariant();
        }
        }
    }
    }
    return QVariant();
}

bool ComponentList::setData(const QModelIndex& index, const QVariant& value, int role)
{
    if (!index.isValid() || index.row() < 0 || index.row() >= rowCount(index))
    {
        return false;
    }

    if (role == Qt::CheckStateRole)
    {
        auto component = d->components[index.row()];
        if (component->setEnabled(!component->isEnabled()))
        {
            return true;
        }
    }
    return false;
}

QVariant ComponentList::headerData(int section, Qt::Orientation orientation, int role) const
{
    if (orientation == Qt::Horizontal)
    {
        if (role == Qt::DisplayRole)
        {
            switch (section)
            {
            case NameColumn:
                return tr("Name");
            case VersionColumn:
                return tr("Version");
            default:
                return QVariant();
            }
        }
    }
    return QVariant();
}
Qt::ItemFlags ComponentList::flags(const QModelIndex &index) const
{
    if (!index.isValid())
        return Qt::NoItemFlags;

    Qt::ItemFlags outFlags = Qt::ItemIsSelectable | Qt::ItemIsEnabled;

    int row = index.row();

    if (row < 0 || row >= d->components.size())
        return Qt::NoItemFlags;

    auto patch = d->components.at(row);
    // TODO: this will need fine-tuning later...
    if(patch->canBeDisabled())
    {
        outFlags |= Qt::ItemIsUserCheckable;
    }
    return outFlags;
}

int ComponentList::rowCount(const QModelIndex &parent) const
{
    return d->components.size();
}

int ComponentList::columnCount(const QModelIndex &parent) const
{
    return NUM_COLUMNS;
}

void ComponentList::move(const int index, const MoveDirection direction)
{
    int theirIndex;
    if (direction == MoveUp)
    {
        theirIndex = index - 1;
    }
    else
    {
        theirIndex = index + 1;
    }

    if (index < 0 || index >= d->components.size())
        return;
    if (theirIndex >= rowCount())
        theirIndex = rowCount() - 1;
    if (theirIndex == -1)
        theirIndex = rowCount() - 1;
    if (index == theirIndex)
        return;
    int togap = theirIndex > index ? theirIndex + 1 : theirIndex;

    auto from = getComponent(index);
    auto to = getComponent(theirIndex);

    if (!from || !to || !to->isMoveable() || !from->isMoveable())
    {
        return;
    }
    beginMoveRows(QModelIndex(), index, index, QModelIndex(), togap);
    d->components.swap(index, theirIndex);
    endMoveRows();
    invalidateLaunchProfile();
    scheduleSave();
}

void ComponentList::invalidateLaunchProfile()
{
    d->m_profile.reset();
}

void ComponentList::installJarMods(QStringList selectedFiles)
{
    installJarMods_internal(selectedFiles);
}

void ComponentList::installCustomJar(QString selectedFile)
{
    installCustomJar_internal(selectedFile);
}

bool ComponentList::installEmpty(const QString& uid, const QString& name)
{
    QString patchDir = FS::PathCombine(d->m_instance->instanceRoot(), "patches");
    if(!FS::ensureFolderPathExists(patchDir))
    {
        return false;
    }
    auto f = std::make_shared<VersionFile>();
    f->name = name;
    f->uid = uid;
    f->version = "1";
    QString patchFileName = FS::PathCombine(patchDir, uid + ".json");
    QFile file(patchFileName);
    if (!file.open(QFile::WriteOnly))
    {
        qCritical() << "Error opening" << file.fileName()
                    << "for reading:" << file.errorString();
        return false;
    }
    file.write(OneSixVersionFormat::versionFileToJson(f).toJson());
    file.close();

    appendComponent(new Component(this, f->uid, f));
    scheduleSave();
    invalidateLaunchProfile();
    return true;
}

bool ComponentList::removeComponent_internal(ComponentPtr patch)
{
    bool ok = true;
    // first, remove the patch file. this ensures it's not used anymore
    auto fileName = patch->getFilename();
    if(fileName.size())
    {
        QFile patchFile(fileName);
        if(patchFile.exists() && !patchFile.remove())
        {
            qCritical() << "File" << fileName << "could not be removed because:" << patchFile.errorString();
            return false;
        }
    }

    // FIXME: we need a generic way of removing local resources, not just jar mods...
    auto preRemoveJarMod = [&](LibraryPtr jarMod) -> bool
    {
        if (!jarMod->isInstanceLocal())
        {
            return true;
        }
        QStringList jar, temp1, temp2, temp3;
        jarMod->getApplicableFiles(currentSystem, jar, temp1, temp2, temp3, d->m_instance->jarmodsPath().absolutePath());
        QFileInfo finfo (jar[0]);
        if(finfo.exists())
        {
            QFile jarModFile(jar[0]);
            if(!jarModFile.remove())
            {
                qCritical() << "File" << jar[0] << "could not be removed because:" << jarModFile.errorString();
                return false;
            }
            return true;
        }
        return true;
    };

    auto vFile = patch->getVersionFile();
    if(vFile)
    {
        auto &jarMods = vFile->jarMods;
        for(auto &jarmod: jarMods)
        {
            ok &= preRemoveJarMod(jarmod);
        }
    }
    return ok;
}

bool ComponentList::installJarMods_internal(QStringList filepaths)
{
    QString patchDir = FS::PathCombine(d->m_instance->instanceRoot(), "patches");
    if(!FS::ensureFolderPathExists(patchDir))
    {
        return false;
    }

    if (!FS::ensureFolderPathExists(d->m_instance->jarModsDir()))
    {
        return false;
    }

    for(auto filepath:filepaths)
    {
        QFileInfo sourceInfo(filepath);
        auto uuid = QUuid::createUuid();
        QString id = uuid.toString().remove('{').remove('}');
        QString target_filename = id + ".jar";
        QString target_id = "org.multimc.jarmod." + id;
        QString target_name = sourceInfo.completeBaseName() + " (jar mod)";
        QString finalPath = FS::PathCombine(d->m_instance->jarModsDir(), target_filename);

        QFileInfo targetInfo(finalPath);
        if(targetInfo.exists())
        {
            return false;
        }

        if (!QFile::copy(sourceInfo.absoluteFilePath(),QFileInfo(finalPath).absoluteFilePath()))
        {
            return false;
        }

        auto f = std::make_shared<VersionFile>();
        auto jarMod = std::make_shared<Library>();
        jarMod->setRawName(GradleSpecifier("org.multimc.jarmods:" + id + ":1"));
        jarMod->setFilename(target_filename);
        jarMod->setDisplayName(sourceInfo.completeBaseName());
        jarMod->setHint("local");
        f->jarMods.append(jarMod);
        f->name = target_name;
        f->uid = target_id;
        QString patchFileName = FS::PathCombine(patchDir, target_id + ".json");

        QFile file(patchFileName);
        if (!file.open(QFile::WriteOnly))
        {
            qCritical() << "Error opening" << file.fileName()
                        << "for reading:" << file.errorString();
            return false;
        }
        file.write(OneSixVersionFormat::versionFileToJson(f).toJson());
        file.close();

        appendComponent(new Component(this, f->uid, f));
    }
    scheduleSave();
    invalidateLaunchProfile();
    return true;
}

bool ComponentList::installCustomJar_internal(QString filepath)
{
    QString patchDir = FS::PathCombine(d->m_instance->instanceRoot(), "patches");
    if(!FS::ensureFolderPathExists(patchDir))
    {
        return false;
    }

    QString libDir = d->m_instance->getLocalLibraryPath();
    if (!FS::ensureFolderPathExists(libDir))
    {
        return false;
    }

    auto specifier = GradleSpecifier("org.multimc:customjar:1");
    QFileInfo sourceInfo(filepath);
    QString target_filename = specifier.getFileName();
    QString target_id = specifier.artifactId();
    QString target_name = sourceInfo.completeBaseName() + " (custom jar)";
    QString finalPath = FS::PathCombine(libDir, target_filename);

    QFileInfo jarInfo(finalPath);
    if (jarInfo.exists())
    {
        if(!QFile::remove(finalPath))
        {
            return false;
        }
    }
    if (!QFile::copy(filepath, finalPath))
    {
        return false;
    }

    auto f = std::make_shared<VersionFile>();
    auto jarMod = std::make_shared<Library>();
    jarMod->setRawName(specifier);
    jarMod->setDisplayName(sourceInfo.completeBaseName());
    jarMod->setHint("local");
    f->mainJar = jarMod;
    f->name = target_name;
    f->uid = target_id;
    QString patchFileName = FS::PathCombine(patchDir, target_id + ".json");

    QFile file(patchFileName);
    if (!file.open(QFile::WriteOnly))
    {
        qCritical() << "Error opening" << file.fileName()
                    << "for reading:" << file.errorString();
        return false;
    }
    file.write(OneSixVersionFormat::versionFileToJson(f).toJson());
    file.close();

    appendComponent(new Component(this, f->uid, f));

    scheduleSave();
    invalidateLaunchProfile();
    return true;
}

std::shared_ptr<LaunchProfile> ComponentList::getProfile() const
{
    if(!d->m_profile)
    {
        try
        {
            auto profile = std::make_shared<LaunchProfile>();
            for(auto file: d->components)
            {
                qDebug() << "Applying" << file->getID() << (file->getProblemSeverity() == ProblemSeverity::Error ? "ERROR" : "GOOD");
                file->applyTo(profile.get());
            }
            d->m_profile = profile;
        }
        catch (const Exception &error)
        {
            qWarning() << "Couldn't apply profile patches because: " << error.cause();
        }
    }
    return d->m_profile;
}

void ComponentList::setOldConfigVersion(const QString& uid, const QString& version)
{
    if(version.isEmpty())
    {
        return;
    }
    d->m_oldConfigVersions[uid] = version;
}

bool ComponentList::setComponentVersion(const QString& uid, const QString& version, bool important)
{
    auto iter = d->componentIndex.find(uid);
    if(iter != d->componentIndex.end())
    {
        ComponentPtr component = *iter;
        // set existing
        if(component->revert())
        {
            component->setVersion(version);
            component->setImportant(important);
            return true;
        }
        return false;
    }
    else
    {
        // add new
        auto component = new Component(this, uid);
        component->m_version = version;
        component->m_important = important;
        appendComponent(component);
        return true;
    }
}

QString ComponentList::getComponentVersion(const QString& uid) const
{
    const auto iter = d->componentIndex.find(uid);
    if (iter != d->componentIndex.end())
    {
        return (*iter)->getVersion();
    }
    return QString();
}