Add FUSE external mapping support, BG3/Oblivion Remastered fixes, fomod-plus and NaK integration

FUSE VFS now deploys non-data-dir mod mappings (Paks, OBSE, UE4SS, etc.)
via real symlinks and injects file-level data-dir mappings (plugins.txt,
loadorder.txt) into the VFS tree. Fixes game launches for Oblivion
Remastered (Root Builder path resolution, script extender support) and
BG3 (Wine prefix documents directory, file mapper symlinks on Linux).

Vendors mo2-fomod-plus plugin and NaK crate for FOMOD installer and
game finder/runtime support.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

1 files changed, 214 insertions, 0 deletions

diff --git a/libs/installer_fomod_plus/installer/FomodInstallerWindow.h b/libs/installer_fomod_plus/installer/FomodInstallerWindow.h
new file mode 100644
index 0000000..bca2215
--- /dev/null
+++ b/libs/installer_fomod_plus/installer/FomodInstallerWindow.h
@@ -0,0 +1,214 @@
+#ifndef FOMODINSTALLERWINDOW_H
+#define FOMODINSTALLERWINDOW_H
+
+#include <qboxlayout.h>
+#include <qbuttongroup.h>
+#include <qcheckbox.h>
+#include <qcombobox.h>
+#include <qtextedit.h>
+
+#include "FomodPlusInstaller.h"
+#include "xml/ModuleConfiguration.h"
+
+#include <QDialog>
+#include <QStackedWidget>
+#include <qradiobutton.h>
+#include <ui/ScaleLabel.h>
+
+#include "FomodInstallerWindow.h"
+#include "lib/FileInstaller.h"
+#include "ui/FomodViewModel.h"
+#include "ui/Colors.h"
+
+#include <QSplitter>
+
+using namespace MOBase;
+
+struct PluginData {
+    std::shared_ptr<PluginViewModel> plugin;
+    QAbstractButton* uiElement;
+};
+
+
+class FomodPlusInstaller;
+/**
+ * @class FomodInstallerWindow
+ * @brief This class represents a window for the FOMOD installer.
+ *
+ * The FomodInstallerWindow class is designed to handle and manage the FOMOD installation
+ * process. It integrates functionalities specific to FOMOD package installations.
+ * By inheriting from QObject, it supports signal-slot mechanisms, enabling interaction
+ * and communication with other components in the application.
+ *
+ * This class is primarily intended to provide a user interface and functionality
+ * to process and run the FOMOD installer in a structured manner.
+ */
+class FomodInstallerWindow final : public QDialog {
+    Q_OBJECT
+
+public:
+    FomodInstallerWindow(FomodPlusInstaller* installer,
+        GuessedValue<QString>& modName,
+        const std::shared_ptr<IFileTree>& tree,
+        QString fomodPath,
+        const std::shared_ptr<FomodViewModel>& viewModel,
+        const nlohmann::json& fomodJson,
+        QWidget* parent = nullptr);
+
+    void closeEvent(QCloseEvent* event) override;
+
+    void saveGeometryAndState() const;
+
+    void restoreGeometryAndState();
+
+    void populatePluginMap();
+
+
+    // So FomodPlusInstaller can check if the user wants to manually install
+    [[nodiscard]] bool isManualInstall() const
+    {
+        return mIsManualInstall;
+    }
+
+    [[nodiscard]] std::shared_ptr<FileInstaller> getFileInstaller() const { return mViewModel->getFileInstaller(); }
+
+private slots:
+    void onNextClicked();
+
+    void updateCheckboxStates() const;
+
+    void onPluginToggled(bool selected, const std::shared_ptr<GroupViewModel>& group,
+        const std::shared_ptr<PluginViewModel>& plugin) const;
+
+    void onPluginManuallyUnchecked(const std::shared_ptr<PluginViewModel>& plugin) const;
+
+    void onPluginHovered(const std::shared_ptr<PluginViewModel>& plugin) const;
+
+    void onSelectPreviousClicked() const { this->selectPreviouslySelectedOptions(); }
+
+    void onResetChoicesClicked();
+
+    void onBackClicked() const;
+
+    void onCancelClicked()
+    {
+        this->saveGeometryAndState();
+        this->reject();
+    }
+
+    void onManualClicked()
+    {
+        mIsManualInstall = true;
+        this->saveGeometryAndState();
+        this->reject();
+    }
+
+    void onInstallClicked();
+
+    [[deprecated]] void toggleImagesShown() const;
+
+private:
+    Logger& log = Logger::getInstance();
+    FomodPlusInstaller* mInstaller;
+    QString mFomodPath;
+    GuessedValue<QString>& mModName;
+    std::shared_ptr<IFileTree> mTree;
+    std::shared_ptr<FomodViewModel> mViewModel;
+    bool mInitialized{ false };
+    std::unordered_map<QString, PluginData> mPluginMap;
+
+
+    // Meta
+    bool mIsManualInstall{};
+    nlohmann::json mFomodJson;
+
+    // Buttons
+    QPushButton* mNextInstallButton{};
+    QPushButton* mBackButton{};
+    QPushButton* mCancelButton{};
+    QPushButton* mManualButton{};
+    QPushButton* mSelectPreviousButton{};
+    QPushButton* mResetChoicesButton{};
+    QPushButton* mHideImagesButton{};
+
+    // Widgets
+    QComboBox* mModNameInput{};
+    QLabel* mDescriptionBox{};
+    QSplitter* mCenterRow{};
+    QSplitter* mLeftPane{};
+    QStackedWidget* mInstallStepStack{};
+    QTextEdit* mNotificationsPanel{};
+    QWidget* mBottomRow{};
+    QWidget* mTopRow{};
+    ScaleLabel* mImageLabel{};
+
+    // Fn
+    void setupUi();
+
+    void updateButtons() const;
+
+    void updateInstallStepStack();
+
+    void updateDisplayForActivePlugin() const;
+
+    void applyFnFromJson(const std::string& pluginSelector, const std::function<void(QAbstractButton*)> &fn);
+
+    void stylePreviouslySelectedOptions();
+
+    void stylePreviouslyDeselectedOptions();
+
+    void selectPreviouslySelectedOptions() const;
+
+    [[nodiscard]] QString getColorStyle(UiColors::ColorApplication color_application) const;
+
+    [[nodiscard]] QBoxLayout* createContainerLayout();
+
+    [[nodiscard]] QSplitter* createCenterRow();
+
+    [[nodiscard]] QWidget* createTopRow();
+
+    [[nodiscard]] QComboBox* createModNameComboBox();
+
+    [[nodiscard]] QWidget* createBottomRow();
+
+    [[nodiscard]] QSplitter* createLeftPane();
+
+    [[nodiscard]] QWidget* createRightPane();
+
+    [[nodiscard]] QTextEdit* createNotificationPanel();
+
+    [[nodiscard]] QWidget* createStepWidget(const std::shared_ptr<StepViewModel>& installStep);
+
+    [[nodiscard]] QWidget* renderGroup(const std::shared_ptr<GroupViewModel>& group);
+
+    static QString createObjectName(const std::shared_ptr<PluginViewModel>& plugin,
+        const std::shared_ptr<GroupViewModel>& group);
+
+    QRadioButton* createPluginRadioButton(const std::shared_ptr<PluginViewModel>& plugin,
+        const std::shared_ptr<GroupViewModel>& group, QWidget* parent);
+
+    QCheckBox* createPluginCheckBox(const std::shared_ptr<PluginViewModel>& plugin,
+        const std::shared_ptr<GroupViewModel>& group, QWidget* parent);
+
+    void renderSelectExactlyOne(QWidget* parent, QLayout* parentLayout, const std::shared_ptr<GroupViewModel>& group);
+
+    void renderCheckboxGroup(QWidget* parent, QLayout* parentLayout,
+        const std::shared_ptr<GroupViewModel>& group);
+
+    QButtonGroup* renderRadioGroup(QWidget* parent, QLayout* parentLayout,
+        const std::shared_ptr<GroupViewModel>& group);
+
+    void addNotification(const QString& message, LogLevel level) const;
+
+    void logMessage(const LogLevel level, const std::string& message, const bool asNotification = true) const
+    {
+        log.logMessage(level, "[WINDOW] " + message);
+        if (asNotification) {
+            addNotification(QString::fromStdString(message), level);
+        }
+    }
+
+};
+
+
+#endif //FOMODINSTALLERWINDOW_H