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, 181 insertions, 0 deletions

diff --git a/libs/installer_fomod_plus/patchwizard/FomodPlusPatchWizard.cpp b/libs/installer_fomod_plus/patchwizard/FomodPlusPatchWizard.cpp
new file mode 100644
index 0000000..00be8d5
--- /dev/null
+++ b/libs/installer_fomod_plus/patchwizard/FomodPlusPatchWizard.cpp
@@ -0,0 +1,181 @@
+#include "FomodPlusPatchWizard.h"
+
+#include <QApplication>
+#include <QDialog>
+#include <QHBoxLayout>
+#include <QLabel>
+#include <QMessageBox>
+#include <QProgressDialog>
+#include <QPushButton>
+#include <QVBoxLayout>
+
+#include "lib/PatchFinder.h"
+#include <FomodRescan.h>
+
+bool FomodPlusPatchWizard::init(IOrganizer* organizer)
+{
+    mOrganizer = organizer;
+    mDialog = new QDialog();
+    mDialog->setWindowTitle(tr("Patch Wizard"));
+    mDialog->setMinimumSize(400, 200);
+    log.setLogFilePath(QDir::currentPath().toStdString() + "/logs/fomodplus-patchwizard.log");
+
+    mOrganizer->onUserInterfaceInitialized([this](QMainWindow*) {
+        logMessage(DEBUG, "patches populated.");
+        mPatchFinder = std::make_unique<PatchFinder>(mOrganizer);
+        mPatchFinder->populateInstalledPlugins();
+        mAvailablePatches = mPatchFinder->getAvailablePatchesForModList();
+        logMessage(DEBUG, "Available Patches: " + std::to_string(mAvailablePatches.size()));
+    });
+
+    return true;
+}
+
+void FomodPlusPatchWizard::display() const
+{
+    // Clear any existing layout
+    if (mDialog->layout() != nullptr) {
+        QLayoutItem* item;
+        while ((item = mDialog->layout()->takeAt(0)) != nullptr) {
+            delete item->widget();
+            delete item;
+        }
+        delete mDialog->layout();
+    }
+
+    if (mAvailablePatches.empty()) {
+        setupEmptyState();
+    } else {
+        setupPatchList();
+    }
+
+    mDialog->exec();
+}
+
+void FomodPlusPatchWizard::setupEmptyState() const
+{
+    auto* mainLayout = new QVBoxLayout(mDialog);
+    mainLayout->setAlignment(Qt::AlignCenter);
+
+    auto* contentWidget = new QWidget(mDialog);
+    auto* contentLayout = new QHBoxLayout(contentWidget);
+    contentLayout->setAlignment(Qt::AlignCenter);
+    contentLayout->setSpacing(16);
+
+    auto* imageLabel = new QLabel(contentWidget);
+    imageLabel->setPixmap(QPixmap(":/fomod/infoscroll").scaled(64, 64, Qt::KeepAspectRatio, Qt::SmoothTransformation));
+
+    auto* textLabel = new QLabel(
+        tr("Nothing of interest yet. The wizard gets wiser as you\ninstall FOMODs, so check back later!"),
+        contentWidget
+    );
+    textLabel->setAlignment(Qt::AlignVCenter | Qt::AlignLeft);
+
+    contentLayout->addWidget(imageLabel);
+    contentLayout->addWidget(textLabel);
+
+    mainLayout->addWidget(contentWidget);
+
+    auto* rescanButton = new QPushButton(tr("Rescan Load Order"), mDialog);
+    // Use const_cast since setupEmptyState is const but onRescanClicked modifies state
+    connect(rescanButton, &QPushButton::clicked, const_cast<FomodPlusPatchWizard*>(this),
+            &FomodPlusPatchWizard::onRescanClicked);
+    mainLayout->addWidget(rescanButton, 0, Qt::AlignCenter);
+}
+
+void FomodPlusPatchWizard::onRescanClicked()
+{
+    const auto confirmResult = QMessageBox::question(
+        mDialog,
+        tr("Rescan Load Order"),
+        tr("Rescanning will populate as many existing choices and options as we can, "
+           "but if some downloads are deleted it may be missing things! "
+           "It may take a few minutes depending on the size of your load order and all that."),
+        QMessageBox::Ok | QMessageBox::Cancel,
+        QMessageBox::Cancel
+    );
+
+    if (confirmResult != QMessageBox::Ok) {
+        return;
+    }
+
+    logMessage(DEBUG, "Rescan requested by user");
+
+    // Create progress dialog
+    QProgressDialog progress(tr("Scanning mods..."), tr("Cancel"), 0, 100, mDialog);
+    progress.setWindowModality(Qt::WindowModal);
+    progress.setMinimumDuration(0);
+    progress.setValue(0);
+
+    bool cancelled = false;
+
+    // Perform the rescan
+    FomodRescan rescan(mOrganizer, mPatchFinder->mFomodDb.get());
+    auto result = rescan.scanAllModsWithChoices([&](int current, int total, const QString& modName) {
+        if (progress.wasCanceled()) {
+            cancelled = true;
+            return;
+        }
+        const int percent = total > 0 ? (current * 100 / total) : 0;
+        progress.setValue(percent);
+        progress.setLabelText(tr("Scanning: %1 (%2/%3)").arg(modName).arg(current).arg(total));
+        QApplication::processEvents();
+    });
+
+    progress.setValue(100);
+
+    if (cancelled) {
+        QMessageBox::information(
+            mDialog,
+            tr("Rescan Cancelled"),
+            tr("The rescan was cancelled. Partial results may have been saved.")
+        );
+        logMessage(INFO, "Rescan cancelled by user");
+    } else {
+        // Show result summary
+        QString summary = tr("Rescan complete!\n\n"
+                            "Mods processed: %1\n"
+                            "Successfully scanned: %2\n"
+                            "Missing archives: %3\n"
+                            "Parse errors: %4")
+            .arg(result.totalModsProcessed)
+            .arg(result.successfullyScanned)
+            .arg(result.missingArchives)
+            .arg(result.parseErrors);
+
+        if (!result.failedMods.empty() && result.failedMods.size() <= 10) {
+            summary += tr("\n\nFailed mods:");
+            for (const auto& mod : result.failedMods) {
+                summary += QString("\n- %1").arg(QString::fromStdString(mod));
+            }
+        } else if (result.failedMods.size() > 10) {
+            summary += tr("\n\n%1 mods failed (see log for details)").arg(result.failedMods.size());
+            for (const auto& mod : result.failedMods) {
+                logMessage(INFO, "Failed mod: " + mod);
+            }
+        }
+
+        QMessageBox::information(mDialog, tr("Rescan Complete"), summary);
+
+        logMessage(INFO, "Rescan complete: " + std::to_string(result.successfullyScanned) +
+                        "/" + std::to_string(result.totalModsProcessed) + " successful");
+    }
+
+    // Refresh available patches
+    mPatchFinder->populateInstalledPlugins();
+    mAvailablePatches = mPatchFinder->getAvailablePatchesForModList();
+    logMessage(DEBUG, "Available Patches after rescan: " + std::to_string(mAvailablePatches.size()));
+
+    // Refresh the UI
+    display();
+}
+
+void FomodPlusPatchWizard::setupPatchList() const
+{
+    auto* mainLayout = new QVBoxLayout(mDialog);
+
+    auto* label = new QLabel(tr("Available patches: %1").arg(mAvailablePatches.size()), mDialog);
+    mainLayout->addWidget(label);
+
+    // TODO: Implement actual patch list UI
+}
\ No newline at end of file