[Client] Route investigate() through the trail helper

- Drop the dead VPN warning branch: rowVisible() already hides IP rows
  above the threshold, so setVpnThreshold(), its member and the spin-box
  connect never took effect.
- Dim IP rows at shared_count > 2 instead of > 1: the count already
  includes the investigated account, so every IP row was dimmed.
- Truncate backStack when a breadcrumb is clicked instead of pushing the
  current user again, so the trail keeps a single path and Back works.
- Word-wrap the trail label so a long chain cannot widen the tab.
- Extract the status/match pill painting into widgets/utility/pill_painter
  and use it from both delegates instead of duplicating it.

cockatrice/CMakeLists.txt

@@ -303,8 +303,12 @@ set(cockatrice_SOURCES
     src/interface/widgets/settings_page/user_interface_settings_page.cpp
     src/interface/widgets/utility/custom_line_edit.cpp
     src/interface/widgets/utility/get_text_with_max.cpp
+    src/interface/widgets/utility/pill_painter.cpp
+    src/interface/widgets/utility/pill_painter.h
     src/interface/widgets/utility/report_utils.cpp
     src/interface/widgets/utility/report_utils.h
+    src/interface/widgets/utility/table_activation.cpp
+    src/interface/widgets/utility/table_activation.h
     src/interface/widgets/utility/sequence_edit.cpp
     src/interface/widgets/utility/visibility_change_listener.cpp
     src/interface/widgets/utility/visibility_change_listener.h
@@ -390,9 +394,12 @@ set(cockatrice_SOURCES
     src/interface/widgets/tabs/api/edhrec/display/top_tags/edhrec_top_tags_api_response_display_widget.cpp
     src/interface/widgets/tabs/api/edhrec/tab_edhrec.cpp
     src/interface/widgets/tabs/api/edhrec/tab_edhrec_main.cpp
+    src/interface/widgets/tabs/alt_table_delegate.cpp
+    src/interface/widgets/tabs/report_status_delegate.cpp
     src/interface/widgets/tabs/tab.cpp
     src/interface/widgets/tabs/tab_account.cpp
     src/interface/widgets/tabs/tab_admin.cpp
+    src/interface/widgets/tabs/tab_alts.cpp
     src/interface/widgets/tabs/tab_card_art_rules.cpp
     src/interface/widgets/tabs/tab_deck_editor.cpp
     src/interface/widgets/tabs/tab_deck_storage.cpp

cockatrice/src/interface/widgets/dialogs/dlg_my_reports.cpp

@@ -230,7 +230,8 @@ void DlgMyReports::onSelectionChanged()
     connect(pend, &PendingCommand::finished, this, &DlgMyReports::reportDetailsResponse);
     client->sendCommand(pend);
 
-    QString status = table->item(row, COL_STATUS)->text();
+    // The cell text is the translated label; the raw status lives in UserRole.
+    const QString status = table->item(row, COL_STATUS)->data(Qt::UserRole).toString();
     bool canComment = (status == "open" || status == "assigned");
     commentButton->setEnabled(canComment);
     commentInput->setEnabled(canComment);

cockatrice/src/interface/widgets/server/user/user_context_menu.cpp

@@ -82,6 +82,7 @@ UserContextMenu::UserContextMenu(TabSupervisor *_tabSupervisor, QWidget *parent,
     aDemoteFromDeveloper = new QAction(QString(), this);
     aGetAdminNotes = new QAction(QString(), this);
     aInvestigateUser = new QAction(QString(), this);
+    aInvestigateAlts = new QAction(QString(), this);
 
     retranslateUi();
 }
@@ -110,6 +111,7 @@ void UserContextMenu::retranslateUi()
     aDemoteFromDeveloper->setText(tr("Demote user from de&veloper"));
     aGetAdminNotes->setText(tr("View admin notes"));
     aInvestigateUser->setText(tr("Investigate user"));
+    aInvestigateAlts->setText(tr("Investigate &alts"));
 }
 
 void UserContextMenu::gamesOfUserReceived(const Response &resp, const CommandContainer &commandContainer)
@@ -453,6 +455,7 @@ void UserContextMenu::showContextMenu(const QPoint &pos,
         menu->addSeparator();
         menu->addAction(aGetAdminNotes);
         menu->addAction(aInvestigateUser);
+        menu->addAction(aInvestigateAlts);
 
         menu->addSeparator();
         if (userLevel.testFlag(ServerInfo_User::IsModerator) &&
@@ -498,6 +501,7 @@ void UserContextMenu::showContextMenu(const QPoint &pos,
     aBanHistory->setEnabled(anotherUser);
     aGetAdminNotes->setEnabled(anotherUser);
     aInvestigateUser->setEnabled(anotherUser);
+    aInvestigateAlts->setEnabled(anotherUser);
     aPromoteToMod->setEnabled(anotherUser);
     aDemoteFromMod->setEnabled(anotherUser);
     aPromoteToJudge->setEnabled(anotherUser);
@@ -552,6 +556,8 @@ void UserContextMenu::showContextMenu(const QPoint &pos,
         execAdminNotes(userName);
     } else if (actionClicked == aInvestigateUser) {
         execInvestigateUser(userName);
+    } else if (actionClicked == aInvestigateAlts) {
+        execInvestigateAlts(userName);
     } else if (actionClicked == aCopyToClipBoard) {
         QClipboard *clipboard = QGuiApplication::clipboard();
         clipboard->setText(deckHash);
@@ -746,6 +752,11 @@ void UserContextMenu::execInvestigateUser(const QString &userName)
     tabSupervisor->openTabModeration(userName);
 }
 
+void UserContextMenu::execInvestigateAlts(const QString &userName)
+{
+    tabSupervisor->openTabAlts(userName);
+}
+
 void UserContextMenu::execAdjustMod(const QString &userName, bool shouldBeMod)
 {
     Command_AdjustMod cmd;

cockatrice/src/interface/widgets/server/user/user_context_menu.h

@@ -54,6 +54,7 @@ private:
     QAction *aGetAdminNotes;
     std::function<QList<GameInviteOption>()> gameInviteLinkProvider;
     QAction *aInvestigateUser;
+    QAction *aInvestigateAlts;
 signals:
     void openMessageDialog(const QString &userName, bool focus);
 private slots:
@@ -127,6 +128,7 @@ public:
     void execWarnHistory(const QString &userName);
     void execAdminNotes(const QString &userName);
     void execInvestigateUser(const QString &userName);
+    void execInvestigateAlts(const QString &userName);
     void execAdjustMod(const QString &userName, bool shouldBeMod);
     void execAdjustJudge(const QString &userName, bool shouldBeJudge);
     void execAdjustDeveloper(const QString &userName, bool shouldBeDeveloper);

cockatrice/src/interface/widgets/tabs/alt_table_delegate.cpp

@@ -0,0 +1,95 @@
+#include "alt_table_delegate.h"
+
+#include "../utility/pill_painter.h"
+
+#include <QApplication>
+#include <QModelIndex>
+#include <QPainter>
+#include <QPalette>
+#include <QStyle>
+#include <QStyleOptionViewItem>
+
+namespace
+{
+constexpr int ICON_TEXT_GAP = 4;
+} // namespace
+
+AltTableDelegate::AltTableDelegate(int viaColumn, int warnsColumn, int bansColumn, int sharedColumn, QObject *parent)
+    : QStyledItemDelegate(parent), viaColumn(viaColumn), warnsColumn(warnsColumn), bansColumn(bansColumn),
+      sharedColumn(sharedColumn)
+{
+}
+
+void AltTableDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const
+{
+    const bool selected = (option.state & QStyle::State_Selected) != 0;
+
+    QStyleOptionViewItem opt(option);
+    initStyleOption(&opt, index);
+    painter->setFont(opt.font);
+    QStyle *style = opt.widget != nullptr ? opt.widget->style() : QApplication::style();
+    const QString text = index.data(Qt::DisplayRole).toString();
+    const QPalette::ColorRole emphasisRole = selected ? QPalette::HighlightedText : QPalette::WindowText;
+
+    if (index.column() == viaColumn) {
+        bool sharedOk = false;
+        const unsigned shared = index.sibling(index.row(), sharedColumn).data(Qt::DisplayRole).toUInt(&sharedOk);
+        const bool ipMatch = text.startsWith(QStringLiteral("ip:"));
+        // shared_count for an IP match already includes the investigated account,
+        // so anything above 2 means the address is shared beyond that pair.
+        const bool dimmed = sharedOk && ipMatch && shared > 2;
+        const QPalette::ColorRole textRole = (dimmed && !selected) ? QPalette::PlaceholderText : emphasisRole;
+
+        QPalette::ColorRole tintRole = QPalette::NoRole;
+        if (text == QStringLiteral("email")) {
+            tintRole = QPalette::Link;
+        } else if (text.startsWith(QStringLiteral("clientid:"))) {
+            tintRole = QPalette::Highlight;
+        } else if (ipMatch) {
+            tintRole = QPalette::PlaceholderText;
+        }
+        if (tintRole != QPalette::NoRole) {
+            if (!pill_painter::paint(painter, opt, tintRole, textRole, text)) {
+                QStyledItemDelegate::paint(painter, opt, index);
+            }
+            return;
+        }
+        QStyledItemDelegate::paint(painter, opt, index);
+        return;
+    }
+
+    if (index.column() == warnsColumn || index.column() == bansColumn) {
+        bool countOk = false;
+        const int count = text.toInt(&countOk);
+        if (countOk && count > 0 && !selected) {
+            const QIcon icon = style->standardIcon(index.column() == bansColumn ? QStyle::SP_MessageBoxCritical
+                                                                                : QStyle::SP_MessageBoxWarning);
+            const int iconSize = qMax(0, opt.rect.height() - 2 * ICON_TEXT_GAP);
+            QRect textRect = opt.rect;
+            if (!icon.isNull() && iconSize > 0) {
+                const QRect iconRect(opt.rect.left() + ICON_TEXT_GAP, opt.rect.top() + ICON_TEXT_GAP, iconSize,
+                                     iconSize);
+                icon.paint(painter, iconRect);
+                textRect.setLeft(iconRect.right() + ICON_TEXT_GAP);
+            }
+            const QString elided = opt.fontMetrics.elidedText(text, opt.textElideMode, textRect.width());
+            style->drawItemText(painter, textRect, Qt::AlignLeft | Qt::AlignVCenter, opt.palette, true, elided,
+                                emphasisRole);
+            return;
+        }
+    }
+
+    QStyledItemDelegate::paint(painter, opt, index);
+}
+
+QSize AltTableDelegate::sizeHint(const QStyleOptionViewItem &option, const QModelIndex &index) const
+{
+    const QSize hint = QStyledItemDelegate::sizeHint(option, index);
+    if (index.column() == viaColumn) {
+        return hint + QSize(pill_painter::PAD_X + 2 * ICON_TEXT_GAP, pill_painter::PAD_Y);
+    }
+    if (index.column() == warnsColumn || index.column() == bansColumn) {
+        return hint + QSize(2 * ICON_TEXT_GAP, 0);
+    }
+    return hint;
+}

cockatrice/src/interface/widgets/tabs/alt_table_delegate.h

@@ -0,0 +1,33 @@
+#ifndef ALT_TABLE_DELEGATE_H
+#define ALT_TABLE_DELEGATE_H
+
+#include <QStyledItemDelegate>
+#include <qtmetamacros.h>
+
+/**
+ * Badge + icon painting for the User Alts table. The match-evidence column
+ * renders as a palette-tinted pill per match type (email / client id / IP), and
+ * an IP shared by more than one other account is dimmed. Warn/ban counts gain
+ * the style's warning/critical icons when nonzero. Selected rows and unknown
+ * content fall back to default painting.
+ */
+class AltTableDelegate : public QStyledItemDelegate
+{
+    Q_OBJECT
+public:
+    explicit AltTableDelegate(int viaColumn,
+                              int warnsColumn,
+                              int bansColumn,
+                              int sharedColumn,
+                              QObject *parent = nullptr);
+    void paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const override;
+    [[nodiscard]] QSize sizeHint(const QStyleOptionViewItem &option, const QModelIndex &index) const override;
+
+private:
+    int viaColumn;
+    int warnsColumn;
+    int bansColumn;
+    int sharedColumn;
+};
+
+#endif // ALT_TABLE_DELEGATE_H

cockatrice/src/interface/widgets/tabs/report_status_delegate.cpp

@@ -0,0 +1,54 @@
+#include "report_status_delegate.h"
+
+#include "../utility/pill_painter.h"
+
+#include <QApplication>
+#include <QPainter>
+#include <QPalette>
+#include <QStyle>
+#include <QStyleOptionViewItem>
+
+ReportStatusDelegate::ReportStatusDelegate(QObject *parent) : QStyledItemDelegate(parent)
+{
+}
+
+void ReportStatusDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const
+{
+    const bool selected = (option.state & QStyle::State_Selected) != 0;
+    QString status = index.data(Qt::UserRole).toString();
+    if (status.isEmpty()) {
+        status = index.data(Qt::DisplayRole).toString();
+    }
+
+    QPalette::ColorRole tintRole = QPalette::NoRole;
+    if (status == QStringLiteral("open")) {
+        tintRole = QPalette::Highlight;
+    } else if (status == QStringLiteral("assigned")) {
+        tintRole = QPalette::Link;
+    } else if (status == QStringLiteral("resolved")) {
+        tintRole = QPalette::PlaceholderText;
+    }
+
+    QStyleOptionViewItem opt(option);
+    initStyleOption(&opt, index);
+    painter->setFont(opt.font);
+
+    if (tintRole == QPalette::NoRole) {
+        const QPalette::ColorRole textRole = selected ? QPalette::HighlightedText : QPalette::PlaceholderText;
+        QStyle *fallbackStyle = opt.widget != nullptr ? opt.widget->style() : QApplication::style();
+        fallbackStyle->drawItemText(painter, opt.rect, Qt::AlignLeft | Qt::AlignVCenter, opt.palette, true, opt.text,
+                                    textRole);
+        return;
+    }
+
+    const QPalette::ColorRole textRole = selected ? QPalette::HighlightedText : QPalette::WindowText;
+    if (!pill_painter::paint(painter, opt, tintRole, textRole, opt.text.isEmpty() ? status : opt.text)) {
+        QStyledItemDelegate::paint(painter, opt, index);
+    }
+}
+
+QSize ReportStatusDelegate::sizeHint(const QStyleOptionViewItem &option, const QModelIndex &index) const
+{
+    const QSize hint = QStyledItemDelegate::sizeHint(option, index);
+    return hint + QSize(pill_painter::PAD_X, pill_painter::PAD_Y);
+}

cockatrice/src/interface/widgets/tabs/report_status_delegate.h

@@ -0,0 +1,22 @@
+#ifndef REPORT_STATUS_DELEGATE_H
+#define REPORT_STATUS_DELEGATE_H
+
+#include <QStyledItemDelegate>
+#include <qtmetamacros.h>
+
+/**
+ * Status pill for the report queue table. Paints the status text on a
+ * translucent badge tinted with a palette role per status, so the colors
+ * always follow the active theme. Falls back to default painting for
+ * selected rows and unknown statuses.
+ */
+class ReportStatusDelegate : public QStyledItemDelegate
+{
+    Q_OBJECT
+public:
+    explicit ReportStatusDelegate(QObject *parent = nullptr);
+    void paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const override;
+    [[nodiscard]] QSize sizeHint(const QStyleOptionViewItem &option, const QModelIndex &index) const override;
+};
+
+#endif // REPORT_STATUS_DELEGATE_H

cockatrice/src/interface/widgets/tabs/tab_alts.cpp

@@ -0,0 +1,639 @@
+#include "tab_alts.h"
+
+#include "../utility/table_activation.h"
+#include "abstract_client.h"
+#include "alt_table_delegate.h"
+#include "libcockatrice/protocol/pb/response.pb.h"
+#include "libcockatrice/protocol/pb/response_user_alts.pb.h"
+
+#include <QAbstractItemView>
+#include <QDateTime>
+#include <QGridLayout>
+#include <QGroupBox>
+#include <QHBoxLayout>
+#include <QHeaderView>
+#include <QItemSelectionModel>
+#include <QLabel>
+#include <QLineEdit>
+#include <QList>
+#include <QPushButton>
+#include <QSignalBlocker>
+#include <QSpinBox>
+#include <QSplitter>
+#include <QTableWidget>
+#include <QTableWidgetItem>
+#include <QTextEdit>
+#include <QVBoxLayout>
+#include <QWidget>
+#include <libcockatrice/protocol/pb/command_report_user_info.pb.h>
+#include <libcockatrice/protocol/pb/moderator_commands.pb.h>
+#include <libcockatrice/protocol/pb/response_ban_history.pb.h>
+#include <libcockatrice/protocol/pb/response_report_user_info.pb.h>
+#include <libcockatrice/protocol/pb/response_warn_history.pb.h>
+#include <libcockatrice/protocol/pb/serverinfo_ban.pb.h>
+#include <libcockatrice/protocol/pb/serverinfo_warning.pb.h>
+#include <libcockatrice/protocol/pending_command.h>
+#include <string>
+
+namespace
+{
+constexpr int COL_ALTS_USER = 0;
+constexpr int COL_ALTS_VIA = 1;
+constexpr int COL_ALTS_DEPTH = 2;
+constexpr int COL_ALTS_SHARED = 3;
+constexpr int COL_ALTS_EMAIL = 4;
+constexpr int COL_ALTS_CLIENTID = 5;
+constexpr int COL_ALTS_REGISTERED = 6;
+constexpr int COL_ALTS_LAST_LOGIN = 7;
+constexpr int COL_ALTS_WARNS = 8;
+constexpr int COL_ALTS_BANS = 9;
+constexpr int COL_ALTS_ACTIVE = 10;
+constexpr int COL_ALTS_COUNT = 11;
+
+constexpr int COL_WARNS_TIME = 0;
+constexpr int COL_WARNS_MODERATOR = 1;
+constexpr int COL_WARNS_REASON = 2;
+constexpr int COL_WARNS_COUNT = 3;
+
+constexpr int COL_BANS_TIME = 0;
+constexpr int COL_BANS_MODERATOR = 1;
+constexpr int COL_BANS_LENGTH = 2;
+constexpr int COL_BANS_REASON = 3;
+constexpr int COL_BANS_COUNT = 4;
+
+constexpr int MAX_ALT_DEPTH = 3;
+// Starting default only (adjustable 1-100000): shared VPN exits routinely
+// cover dozens of users, so 10 hides the obvious VPN noise but keeps
+// small shared networks visible.
+constexpr int DEFAULT_VPN_THRESHOLD = 10;
+
+void configureAltTable(QTableWidget *table)
+{
+    table->setSelectionBehavior(QAbstractItemView::SelectRows);
+    table->setSelectionMode(QAbstractItemView::SingleSelection);
+    table->setEditTriggers(QAbstractItemView::NoEditTriggers);
+    table->verticalHeader()->setVisible(false);
+    table->setAlternatingRowColors(true);
+    table->horizontalHeader()->setSectionResizeMode(QHeaderView::ResizeToContents);
+    table->horizontalHeader()->setStretchLastSection(true);
+}
+} // namespace
+
+TabAlts::TabAlts(TabSupervisor *_tabSupervisor, AbstractClient *_client, const QString &initialUser)
+    : Tab(_tabSupervisor), client(_client)
+{
+    auto *centralWidget = new QWidget(this);
+    setCentralWidget(centralWidget);
+
+    searchEdit = new QLineEdit;
+    searchEdit->setClearButtonEnabled(true);
+    connect(searchEdit, &QLineEdit::returnPressed, this, &TabAlts::investigateUser);
+
+    depthSpin = new QSpinBox;
+    depthSpin->setMinimum(1);
+    depthSpin->setMaximum(MAX_ALT_DEPTH);
+    depthSpin->setValue(1);
+
+    investigateButton = new QPushButton;
+    connect(investigateButton, &QPushButton::clicked, this, &TabAlts::investigateUser);
+
+    backButton = new QPushButton;
+    backButton->setEnabled(false);
+    connect(backButton, &QPushButton::clicked, this, &TabAlts::goBack);
+
+    statusLabel = new QLabel;
+    trailLabel = new QLabel;
+    trailLabel->setTextFormat(Qt::RichText);
+    trailLabel->setTextInteractionFlags(Qt::TextBrowserInteraction);
+    trailLabel->setOpenExternalLinks(false);
+    // The trail grows with every hop, so let it wrap instead of forcing the tab
+    // wider than the window.
+    trailLabel->setWordWrap(true);
+    connect(trailLabel, &QLabel::linkActivated, this, [this](const QString &userName) {
+        if (!userName.isEmpty() && userName != currentUser) {
+            goToTrailEntry(userName);
+        }
+    });
+
+    auto *topBar = new QHBoxLayout;
+    topBar->addWidget(backButton);
+    topBar->addWidget(searchEdit);
+    topBar->addWidget(depthSpin);
+    topBar->addWidget(investigateButton);
+
+    auto makeChip = [this](const QString &text) {
+        auto *chip = new QPushButton(text);
+        chip->setCheckable(true);
+        chip->setChecked(true);
+        connect(chip, &QPushButton::toggled, this, &TabAlts::onFilterChanged);
+        return chip;
+    };
+    emailChip = makeChip(QString());
+    clientIdChip = makeChip(QString());
+    ipChip = makeChip(QString());
+    vpnLabel = new QLabel;
+    vpnSpin = new QSpinBox;
+    vpnSpin->setMinimum(1);
+    vpnSpin->setMaximum(100000);
+    vpnSpin->setValue(DEFAULT_VPN_THRESHOLD);
+    connect(vpnSpin, &QSpinBox::valueChanged, this, &TabAlts::onFilterChanged);
+
+    auto *filterBar = new QHBoxLayout;
+    filterBar->addWidget(emailChip);
+    filterBar->addWidget(clientIdChip);
+    filterBar->addWidget(ipChip);
+    filterBar->addWidget(vpnLabel);
+    filterBar->addWidget(vpnSpin);
+    filterBar->addStretch();
+
+    altsTable = new QTableWidget(0, COL_ALTS_COUNT);
+    configureAltTable(altsTable);
+    altsDelegate = new AltTableDelegate(COL_ALTS_VIA, COL_ALTS_WARNS, COL_ALTS_BANS, COL_ALTS_SHARED, altsTable);
+    altsTable->setItemDelegateForColumn(COL_ALTS_VIA, altsDelegate);
+    altsTable->setItemDelegateForColumn(COL_ALTS_WARNS, altsDelegate);
+    altsTable->setItemDelegateForColumn(COL_ALTS_BANS, altsDelegate);
+    connectTableActivation(altsTable, this, [this](const QModelIndex &index) {
+        if (!index.isValid()) {
+            return;
+        }
+        auto *userItem = altsTable->item(index.row(), COL_ALTS_USER);
+        if (userItem != nullptr && !userItem->text().isEmpty() && userItem->text() != currentUser) {
+            investigate(userItem->text());
+        }
+    });
+    connect(altsTable, &QTableWidget::itemSelectionChanged, this, &TabAlts::onAltSelected);
+
+    detailNameValue = new QLabel;
+    detailCountsValue = new QLabel;
+    detailNotesEdit = new QTextEdit;
+    detailNotesEdit->setReadOnly(true);
+    // Compact cap so the warn/ban tables stay visible without scrolling the tab.
+    detailNotesEdit->setMaximumHeight(60);
+    warnsTable = new QTableWidget(0, COL_WARNS_COUNT);
+    configureAltTable(warnsTable);
+    bansTable = new QTableWidget(0, COL_BANS_COUNT);
+    configureAltTable(bansTable);
+
+    auto *detailGrid = new QGridLayout;
+    detailNameLabel = new QLabel;
+    detailCountsLabel = new QLabel;
+    detailNotesLabel = new QLabel;
+    detailGrid->addWidget(detailNameLabel, 0, 0);
+    detailGrid->addWidget(detailNameValue, 0, 1);
+    detailGrid->addWidget(detailCountsLabel, 0, 2);
+    detailGrid->addWidget(detailCountsValue, 0, 3);
+    detailGrid->addWidget(detailNotesLabel, 1, 0);
+    detailGrid->addWidget(detailNotesEdit, 1, 1, 1, 3);
+
+    detailsGroup = new QGroupBox;
+    auto *detailsLayout = new QVBoxLayout(detailsGroup);
+    detailsLayout->addLayout(detailGrid);
+    detailsLayout->addWidget(warnsTable, 1);
+    detailsLayout->addWidget(bansTable, 1);
+    investigateSelectedButton = new QPushButton;
+    investigateSelectedButton->setEnabled(false);
+    connect(investigateSelectedButton, &QPushButton::clicked, this, &TabAlts::investigateSelected);
+    detailsLayout->addWidget(investigateSelectedButton);
+
+    auto *contentSplitter = new QSplitter(Qt::Horizontal);
+    contentSplitter->addWidget(altsTable);
+    contentSplitter->addWidget(detailsGroup);
+    contentSplitter->setStretchFactor(0, 3);
+    contentSplitter->setStretchFactor(1, 2);
+    detailsGroup->setMinimumWidth(260);
+
+    auto *mainLayout = new QVBoxLayout(centralWidget);
+    mainLayout->addLayout(topBar);
+    mainLayout->addLayout(filterBar);
+    mainLayout->addWidget(statusLabel);
+    mainLayout->addWidget(trailLabel);
+    mainLayout->addWidget(contentSplitter, 1);
+
+    retranslateUi();
+    clearDetails();
+    investigate(initialUser);
+}
+
+void TabAlts::retranslateUi()
+{
+    searchEdit->setPlaceholderText(tr("User name"));
+    depthSpin->setPrefix(tr("Depth: "));
+    depthSpin->setToolTip(tr("Search depth: 1 finds direct matches, higher values follow alts of alts."));
+    investigateButton->setText(tr("Investigate"));
+    backButton->setText(tr("Back"));
+    backButton->setToolTip(tr("Back to the previously investigated user"));
+    if (currentUser.isEmpty()) {
+        statusLabel->setText(tr("Enter a user name to investigate."));
+    }
+
+    emailChip->setText(tr("Email"));
+    emailChip->setToolTip(tr("Show or hide email matches"));
+    clientIdChip->setText(tr("Client ID"));
+    clientIdChip->setToolTip(tr("Show or hide client ID matches"));
+    ipChip->setText(tr("IP"));
+    ipChip->setToolTip(tr("Show or hide IP address matches"));
+    vpnLabel->setText(tr("Hide IPs shared by more than"));
+    vpnSpin->setSuffix(tr(" users"));
+
+    altsTable->setHorizontalHeaderLabels({tr("User"), tr("Via"), tr("Depth"), tr("Shared"), tr("eMail"),
+                                          tr("Client ID"), tr("Registered"), tr("Last login"), tr("Warns"), tr("Bans"),
+                                          tr("Active")});
+    altsTable->setToolTip(tr("Double-click or press Enter on a row to investigate that account"));
+    warnsTable->setHorizontalHeaderLabels({tr("Warning time"), tr("Moderator"), tr("Reason")});
+    bansTable->setHorizontalHeaderLabels({tr("Ban time"), tr("Moderator"), tr("Length"), tr("Reason")});
+
+    detailsGroup->setTitle(tr("Selected user"));
+    detailNameLabel->setText(tr("Name:"));
+    detailCountsLabel->setText(tr("Counts:"));
+    detailNotesLabel->setText(tr("Admin notes:"));
+    investigateSelectedButton->setText(tr("Investigate this user"));
+    investigateSelectedButton->setToolTip(tr("Open the selected account as a new investigation"));
+
+    if (!lastAlts.isEmpty()) {
+        renderTable();
+    }
+}
+
+QString TabAlts::formatEpoch(quint64 ts) const
+{
+    if (ts == 0) {
+        return tr("Unknown");
+    }
+    return QDateTime::fromSecsSinceEpoch(ts).toLocalTime().toString("yyyy-MM-dd HH:mm");
+}
+
+void TabAlts::investigate(const QString &userName)
+{
+    if (userName.isEmpty() || userName == currentUser) {
+        return;
+    }
+    // Alt matches are symmetric, so revisiting an earlier account is a normal
+    // double-click. Truncate there instead of pushing it again, so the trail
+    // stays a single path.
+    if (backStack.contains(userName)) {
+        goToTrailEntry(userName);
+        return;
+    }
+    if (!currentUser.isEmpty()) {
+        backStack << currentUser;
+        backButton->setEnabled(true);
+    }
+    loadUser(userName);
+}
+
+void TabAlts::goToTrailEntry(const QString &userName)
+{
+    const int index = backStack.indexOf(userName);
+    if (index < 0) {
+        investigate(userName);
+        return;
+    }
+    // Clicking an earlier crumb truncates the history there instead of pushing
+    // another entry, so the trail keeps a single path and Back still works.
+    backStack.erase(backStack.begin() + index, backStack.end());
+    backButton->setEnabled(!backStack.isEmpty());
+    loadUser(userName);
+}
+
+void TabAlts::goBack()
+{
+    if (backStack.isEmpty()) {
+        return;
+    }
+    const QString previousUser = backStack.takeLast();
+    backButton->setEnabled(!backStack.isEmpty());
+    loadUser(previousUser);
+}
+
+void TabAlts::loadUser(const QString &userName)
+{
+    currentUser = userName;
+    searchEdit->setText(userName);
+    updateTrail();
+    investigateUser();
+}
+
+void TabAlts::updateTrail()
+{
+    QStringList trail = backStack;
+    trail << currentUser;
+    trail.removeAll(QString());
+    QStringList links;
+    for (const QString &name : trail) {
+        const QString safeName = name.toHtmlEscaped();
+        if (name == currentUser) {
+            links << QStringLiteral("<b>") + safeName + QStringLiteral("</b>");
+        } else {
+            links << QStringLiteral("<a href=\"") + safeName + QStringLiteral("\">") + safeName +
+                         QStringLiteral("</a>");
+        }
+    }
+    trailLabel->setText(links.join(QStringLiteral(" › ")));
+    trailLabel->setVisible(!links.isEmpty());
+}
+
+void TabAlts::investigateUser()
+{
+    const QString userName = searchEdit->text().simplified();
+    if (userName.isEmpty()) {
+        return;
+    }
+    if (userName != currentUser && !currentUser.isEmpty()) {
+        backStack << currentUser;
+        backButton->setEnabled(true);
+    }
+    currentUser = userName;
+    updateTrail();
+    lastAlts.clear();
+    selectedUser.clear();
+    clearDetails();
+    altsTable->setRowCount(0);
+    statusLabel->setText(tr("Loading alts for %1...").arg(currentUser));
+    requestAlts(userName, depthSpin->value());
+}
+
+void TabAlts::requestAlts(const QString &userName, int depth)
+{
+    Command_GetUserAlts cmd;
+    cmd.set_user_name(userName.toStdString());
+    cmd.set_depth(static_cast<google::protobuf::uint32>(depth));
+    PendingCommand *pend = client->prepareModeratorCommand(cmd);
+    connect(pend, &PendingCommand::finished, this, [this, userName](const Response &response) {
+        if (userName == currentUser) {
+            altsResponse(response);
+        }
+    });
+    client->sendCommand(pend);
+}
+
+void TabAlts::altsResponse(const Response &response)
+{
+    lastAlts.clear();
+    if (response.response_code() != Response::RespOk) {
+        renderTable();
+        statusLabel->setText(tr("User %1 not found.").arg(currentUser));
+        return;
+    }
+
+    const Response_UserAlts &resp = response.GetExtension(Response_UserAlts::ext);
+    for (int i = 0; i < resp.alts_size(); ++i) {
+        lastAlts << resp.alts(i);
+    }
+    renderTable();
+}
+
+bool TabAlts::rowVisible(const ServerInfo_UserAlt &alt) const
+{
+    const QString name = QString::fromStdString(alt.user_name());
+    if (name == currentUser) {
+        return true;
+    }
+    if (!alt.has_match_reason() || alt.match_reason().empty()) {
+        return true;
+    }
+    const QString reason = QString::fromStdString(alt.match_reason());
+    if (reason == QStringLiteral("email")) {
+        return emailChip->isChecked();
+    }
+    if (reason.startsWith(QStringLiteral("clientid:"))) {
+        return clientIdChip->isChecked();
+    }
+    if (reason.startsWith(QStringLiteral("ip:"))) {
+        return ipChip->isChecked() &&
+               (!alt.has_shared_count() || alt.shared_count() <= static_cast<unsigned>(vpnSpin->value()));
+    }
+    return true;
+}
+
+void TabAlts::renderTable()
+{
+    // Blocked so the programmatic refill neither wipes the details panel
+    // (via the selection-cleared path) nor refetches them on restore.
+    const QSignalBlocker blocker(altsTable);
+    altsTable->setRowCount(0);
+
+    int emailCount = 0;
+    int clientIdCount = 0;
+    int ipCount = 0;
+    for (const ServerInfo_UserAlt &alt : lastAlts) {
+        const QString reason = QString::fromStdString(alt.match_reason());
+        if (reason == QStringLiteral("email")) {
+            ++emailCount;
+        } else if (reason.startsWith(QStringLiteral("clientid:"))) {
+            ++clientIdCount;
+        } else if (reason.startsWith(QStringLiteral("ip:"))) {
+            ++ipCount;
+        }
+    }
+    emailChip->setText(tr("Email (%1)").arg(emailCount));
+    clientIdChip->setText(tr("Client ID (%1)").arg(clientIdCount));
+    ipChip->setText(tr("IP (%1)").arg(ipCount));
+
+    QFont userFont = altsTable->font();
+    userFont.setBold(true);
+    const QColor dimColor = palette().color(QPalette::Disabled, QPalette::Text);
+
+    int hidden = 0;
+    int row = 0;
+    for (const ServerInfo_UserAlt &alt : lastAlts) {
+        if (!rowVisible(alt)) {
+            ++hidden;
+            continue;
+        }
+        altsTable->insertRow(row);
+        auto *userItem = new QTableWidgetItem(QString::fromStdString(alt.user_name()));
+        userItem->setFont(userFont);
+        altsTable->setItem(row, COL_ALTS_USER, userItem);
+        altsTable->setItem(row, COL_ALTS_VIA,
+                           new QTableWidgetItem(alt.has_match_reason() && !alt.match_reason().empty()
+                                                    ? QString::fromStdString(alt.match_reason())
+                                                    : QStringLiteral("-")));
+        altsTable->setItem(row, COL_ALTS_DEPTH,
+                           new QTableWidgetItem(alt.has_depth() ? QString::number(alt.depth()) : QStringLiteral("-")));
+        altsTable->setItem(
+            row, COL_ALTS_SHARED,
+            new QTableWidgetItem(alt.has_shared_count() ? QString::number(alt.shared_count()) : QStringLiteral("-")));
+        altsTable->setItem(row, COL_ALTS_EMAIL, new QTableWidgetItem(QString::fromStdString(alt.email())));
+        altsTable->setItem(row, COL_ALTS_CLIENTID, new QTableWidgetItem(QString::fromStdString(alt.clientid())));
+        altsTable->setItem(row, COL_ALTS_REGISTERED, new QTableWidgetItem(formatEpoch(alt.registration_time())));
+        altsTable->setItem(row, COL_ALTS_LAST_LOGIN, new QTableWidgetItem(formatEpoch(alt.last_login())));
+        altsTable->setItem(row, COL_ALTS_WARNS, new QTableWidgetItem(QString::number(alt.warn_count())));
+        altsTable->setItem(row, COL_ALTS_BANS, new QTableWidgetItem(QString::number(alt.ban_count())));
+        altsTable->setItem(row, COL_ALTS_ACTIVE, new QTableWidgetItem(alt.is_active() ? tr("yes") : tr("no")));
+        // shared_count already includes the investigated account, so anything
+        // above 2 means the address is shared beyond that pair.
+        if (QString::fromStdString(alt.match_reason()).startsWith(QStringLiteral("ip:")) && alt.has_shared_count() &&
+            alt.shared_count() > 2) {
+            for (int col = 0; col < COL_ALTS_COUNT; ++col) {
+                if (col == COL_ALTS_VIA) {
+                    continue;
+                }
+                if (auto *item = altsTable->item(row, col)) {
+                    item->setForeground(dimColor);
+                }
+            }
+        }
+        ++row;
+    }
+    if (hidden == 0) {
+        statusLabel->setText(tr("%1 account(s) related to %2.").arg(lastAlts.size()).arg(currentUser));
+    } else {
+        statusLabel->setText(tr("%1 shown, %2 hidden by filters (%3 total) related to %4.")
+                                 .arg(row)
+                                 .arg(hidden)
+                                 .arg(lastAlts.size())
+                                 .arg(currentUser));
+    }
+
+    if (!selectedUser.isEmpty()) {
+        bool restored = false;
+        for (int restoreRow = 0; restoreRow < altsTable->rowCount(); ++restoreRow) {
+            auto *userItem = altsTable->item(restoreRow, COL_ALTS_USER);
+            if (userItem != nullptr && userItem->text() == selectedUser) {
+                altsTable->setCurrentItem(userItem, QItemSelectionModel::Select | QItemSelectionModel::Rows);
+                restored = true;
+                break;
+            }
+        }
+        if (!restored) {
+            selectedUser.clear();
+            clearDetails();
+        }
+    }
+}
+
+void TabAlts::onFilterChanged()
+{
+    if (lastAlts.isEmpty()) {
+        return;
+    }
+    renderTable();
+}
+
+void TabAlts::investigateSelected()
+{
+    if (!selectedUser.isEmpty() && selectedUser != currentUser) {
+        investigate(selectedUser);
+    }
+}
+
+void TabAlts::onAltSelected()
+{
+    const auto selected = altsTable->selectedItems();
+    if (selected.isEmpty()) {
+        selectedUser.clear();
+        clearDetails();
+        return;
+    }
+    auto *userItem = altsTable->item(selected.first()->row(), COL_ALTS_USER);
+    if (userItem == nullptr || userItem->text().isEmpty() || userItem->text() == selectedUser) {
+        return;
+    }
+    selectedUser = userItem->text();
+    requestDetails(selectedUser);
+}
+
+void TabAlts::requestDetails(const QString &userName)
+{
+    detailNameValue->setText(userName);
+    detailCountsValue->setText(tr("Loading..."));
+    detailNotesEdit->clear();
+    warnsTable->setRowCount(0);
+    bansTable->setRowCount(0);
+    investigateSelectedButton->setEnabled(userName != currentUser);
+
+    Command_ReportUserInfo infoCmd;
+    infoCmd.set_user_name(userName.toStdString());
+    PendingCommand *infoPend = client->prepareModeratorCommand(infoCmd);
+    connect(infoPend, &PendingCommand::finished, this, [this, userName](const Response &response) {
+        if (userName == selectedUser) {
+            userDetailsResponse(response);
+        }
+    });
+    client->sendCommand(infoPend);
+
+    Command_GetWarnHistory warnCmd;
+    warnCmd.set_user_name(userName.toStdString());
+    PendingCommand *warnPend = client->prepareModeratorCommand(warnCmd);
+    connect(warnPend, &PendingCommand::finished, this, [this, userName](const Response &response) {
+        if (userName == selectedUser) {
+            warnHistoryResponse(response);
+        }
+    });
+    client->sendCommand(warnPend);
+
+    Command_GetBanHistory banCmd;
+    banCmd.set_user_name(userName.toStdString());
+    PendingCommand *banPend = client->prepareModeratorCommand(banCmd);
+    connect(banPend, &PendingCommand::finished, this, [this, userName](const Response &response) {
+        if (userName == selectedUser) {
+            banHistoryResponse(response);
+        }
+    });
+    client->sendCommand(banPend);
+}
+
+void TabAlts::clearDetails()
+{
+    detailNameValue->clear();
+    detailCountsValue->setText(tr("Select a row to inspect its history."));
+    detailNotesEdit->clear();
+    warnsTable->setRowCount(0);
+    bansTable->setRowCount(0);
+    investigateSelectedButton->setEnabled(false);
+}
+
+void TabAlts::userDetailsResponse(const Response &response)
+{
+    if (response.response_code() != Response::RespOk) {
+        detailCountsValue->setText(tr("Error loading user info."));
+        return;
+    }
+
+    const Response_ReportUserInfo &resp = response.GetExtension(Response_ReportUserInfo::ext);
+    detailCountsValue->setText(tr("Reports: %1   Bans: %2   Warnings: %3")
+                                   .arg(resp.total_reports())
+                                   .arg(resp.total_bans())
+                                   .arg(resp.total_warns()));
+
+    if (resp.has_admin_notes() && !resp.admin_notes().empty()) {
+        detailNotesEdit->setPlainText(QString::fromStdString(resp.admin_notes()));
+    } else {
+        detailNotesEdit->setPlainText(tr("(none)"));
+    }
+}
+
+void TabAlts::warnHistoryResponse(const Response &response)
+{
+    warnsTable->setRowCount(0);
+    if (response.response_code() != Response::RespOk) {
+        return;
+    }
+
+    const Response_WarnHistory &resp = response.GetExtension(Response_WarnHistory::ext);
+    warnsTable->setRowCount(resp.warn_list_size());
+    for (int i = 0; i < resp.warn_list_size(); ++i) {
+        const ServerInfo_Warning &warn = resp.warn_list(i);
+        warnsTable->setItem(i, COL_WARNS_TIME, new QTableWidgetItem(QString::fromStdString(warn.time_of())));
+        warnsTable->setItem(i, COL_WARNS_MODERATOR, new QTableWidgetItem(QString::fromStdString(warn.admin_name())));
+        warnsTable->setItem(i, COL_WARNS_REASON, new QTableWidgetItem(QString::fromStdString(warn.reason())));
+    }
+}
+
+void TabAlts::banHistoryResponse(const Response &response)
+{
+    bansTable->setRowCount(0);
+    if (response.response_code() != Response::RespOk) {
+        return;
+    }
+
+    const Response_BanHistory &resp = response.GetExtension(Response_BanHistory::ext);
+    bansTable->setRowCount(resp.ban_list_size());
+    for (int i = 0; i < resp.ban_list_size(); ++i) {
+        const ServerInfo_Ban &ban = resp.ban_list(i);
+        bansTable->setItem(i, COL_BANS_TIME, new QTableWidgetItem(QString::fromStdString(ban.ban_time())));
+        bansTable->setItem(i, COL_BANS_MODERATOR, new QTableWidgetItem(QString::fromStdString(ban.admin_name())));
+        bansTable->setItem(i, COL_BANS_LENGTH, new QTableWidgetItem(QString::fromStdString(ban.ban_length())));
+        bansTable->setItem(i, COL_BANS_REASON, new QTableWidgetItem(QString::fromStdString(ban.ban_reason())));
+    }
+}

cockatrice/src/interface/widgets/tabs/tab_alts.h

@@ -0,0 +1,98 @@
+#ifndef TAB_ALTS_H
+#define TAB_ALTS_H
+
+#include "tab.h"
+
+#include <QList>
+#include <QString>
+#include <QtGlobal>
+#include <libcockatrice/protocol/pb/serverinfo_user_alt.pb.h>
+#include <qtmetamacros.h>
+
+class AbstractClient;
+class AltTableDelegate;
+class QGroupBox;
+class QLabel;
+class QLineEdit;
+class QPushButton;
+class QSpinBox;
+class QTableWidget;
+class QTextEdit;
+class Response;
+class TabSupervisor;
+
+/**
+ * Staff alt-graph investigation tool. Shows accounts related to the
+ * investigated user (shared email, client id, or recent IP address),
+ * including transitive alts-of-alts, with per-row match evidence.
+ * Selecting a row loads that account's warnings, bans, and admin notes.
+ */
+class TabAlts : public Tab
+{
+    Q_OBJECT
+public:
+    explicit TabAlts(TabSupervisor *_tabSupervisor, AbstractClient *_client, const QString &initialUser = {});
+    void retranslateUi() override;
+    [[nodiscard]] QString getTabText() const override
+    {
+        return tr("User Alts");
+    }
+    void investigate(const QString &userName);
+
+private slots:
+    void investigateUser();
+    void goBack();
+    void investigateSelected();
+    void altsResponse(const Response &response);
+    void onFilterChanged();
+    void onAltSelected();
+    void userDetailsResponse(const Response &response);
+    void warnHistoryResponse(const Response &response);
+    void banHistoryResponse(const Response &response);
+
+private:
+    void loadUser(const QString &userName);
+    void goToTrailEntry(const QString &userName);
+    void updateTrail();
+    void requestAlts(const QString &userName, int depth);
+    void requestDetails(const QString &userName);
+    void clearDetails();
+    void renderTable();
+    [[nodiscard]] bool rowVisible(const ServerInfo_UserAlt &alt) const;
+    [[nodiscard]] QString formatEpoch(quint64 ts) const;
+
+    AbstractClient *client;
+    QString currentUser;
+    QString selectedUser;
+    QList<QString> backStack;
+    QList<ServerInfo_UserAlt> lastAlts;
+
+    QLineEdit *searchEdit;
+    QSpinBox *depthSpin;
+    QPushButton *investigateButton;
+    QPushButton *backButton;
+    QPushButton *investigateSelectedButton;
+    QLabel *trailLabel;
+    QLabel *statusLabel;
+    QTableWidget *altsTable;
+    AltTableDelegate *altsDelegate;
+
+    QPushButton *emailChip;
+    QPushButton *clientIdChip;
+    QPushButton *ipChip;
+    QLabel *vpnLabel;
+    QSpinBox *vpnSpin;
+
+    QLabel *detailNameValue;
+    QLabel *detailCountsValue;
+    QTextEdit *detailNotesEdit;
+    QTableWidget *warnsTable;
+    QTableWidget *bansTable;
+
+    QGroupBox *detailsGroup;
+    QLabel *detailNameLabel;
+    QLabel *detailCountsLabel;
+    QLabel *detailNotesLabel;
+};
+
+#endif // TAB_ALTS_H

cockatrice/src/interface/widgets/tabs/tab_moderation.cpp

@@ -1,11 +1,13 @@
 #include "tab_moderation.h"
 
+#include "../utility/table_activation.h"
 #include "abstract_client.h"
 #include "libcockatrice/protocol/pb/admin_commands.pb.h"
 #include "libcockatrice/protocol/pb/response.pb.h"
 #include "libcockatrice/protocol/pb/serverinfo_moderator_login.pb.h"
 #include "libcockatrice/protocol/pb/serverinfo_user_alt.pb.h"
 #include "libcockatrice/protocol/pb/serverinfo_user_session.pb.h"
+#include "tab_supervisor.h"
 
 #include <QAbstractItemView>
 #include <QDateTime>
@@ -21,6 +23,7 @@
 #include <QSharedPointer>
 #include <QSplitter>
 #include <QStringList>
+#include <QTabWidget>
 #include <QTableWidget>
 #include <QTableWidgetItem>
 #include <QTextEdit>
@@ -93,38 +96,67 @@ TabModeration::TabModeration(TabSupervisor *_tabSupervisor, AbstractClient *_cli
     topBar->addWidget(removeAvatarButton);
 
     userInfoGroup = new QGroupBox;
-    userInfoNameLabel = new QLabel;
     userInfoNameValue = new QLabel;
-    userInfoRegisteredLabel = new QLabel;
-    userInfoRegisteredValue = new QLabel;
-    userInfoLastLoginLabel = new QLabel;
-    userInfoLastLoginValue = new QLabel;
-    userInfoStatusLabel = new QLabel;
+    QFont displayFont = userInfoNameValue->font();
+    displayFont.setPointSize(displayFont.pointSize() + 6);
+    displayFont.setBold(true);
+    userInfoNameValue->setFont(displayFont);
     userInfoStatusValue = new QLabel;
-    userInfoCountsLabel = new QLabel;
-    userInfoCountsValue = new QLabel;
+    QFont statusFont = userInfoStatusValue->font();
+    statusFont.setBold(true);
+    userInfoStatusValue->setFont(statusFont);
+    sublineLabel = new QLabel;
+
+    auto makeCountCard = [](const QString &title, QLabel *&value) {
+        auto *card = new QGroupBox(title);
+        value = new QLabel(QStringLiteral("–"), card);
+        QFont cardFont = value->font();
+        cardFont.setPointSize(cardFont.pointSize() + 6);
+        cardFont.setBold(true);
+        value->setFont(cardFont);
+        value->setAlignment(Qt::AlignCenter);
+        auto *cardLayout = new QVBoxLayout(card);
+        cardLayout->addWidget(value);
+        return card;
+    };
+    cardReports = makeCountCard(QString(), cardReportsValue);
+    cardWarns = makeCountCard(QString(), cardWarnsValue);
+    cardBans = makeCountCard(QString(), cardBansValue);
+
+    altsCard = new QGroupBox;
+    altsCountValue = new QLabel(QStringLiteral("–"), altsCard);
+    QFont altsFont = altsCountValue->font();
+    altsFont.setPointSize(altsFont.pointSize() + 6);
+    altsFont.setBold(true);
+    altsCountValue->setFont(altsFont);
+    altsCountValue->setAlignment(Qt::AlignCenter);
+    openAltsButton = new QPushButton;
+    connect(openAltsButton, &QPushButton::clicked, this, &TabModeration::openAltsGraph);
+    auto *altsCardLayout = new QVBoxLayout(altsCard);
+    altsCardLayout->addWidget(altsCountValue);
+    altsCardLayout->addWidget(openAltsButton);
+
+    auto *cardsRow = new QHBoxLayout;
+    cardsRow->addWidget(cardReports);
+    cardsRow->addWidget(cardWarns);
+    cardsRow->addWidget(cardBans);
+    cardsRow->addWidget(altsCard);
+
     userInfoNotesLabel = new QLabel;
     userInfoNotesEdit = new QTextEdit;
     userInfoNotesEdit->setReadOnly(true);
 
-    auto *infoGrid = new QGridLayout;
-    infoGrid->addWidget(userInfoNameLabel, 0, 0);
-    infoGrid->addWidget(userInfoNameValue, 0, 1);
-    infoGrid->addWidget(userInfoRegisteredLabel, 0, 2);
-    infoGrid->addWidget(userInfoRegisteredValue, 0, 3);
-    infoGrid->addWidget(userInfoLastLoginLabel, 1, 0);
-    infoGrid->addWidget(userInfoLastLoginValue, 1, 1);
-    infoGrid->addWidget(userInfoStatusLabel, 1, 2);
-    infoGrid->addWidget(userInfoStatusValue, 1, 3);
-    infoGrid->addWidget(userInfoCountsLabel, 2, 0);
-    infoGrid->addWidget(userInfoCountsValue, 2, 1, 1, 3);
-    infoGrid->addWidget(userInfoNotesLabel, 3, 0, Qt::AlignTop);
-    infoGrid->addWidget(userInfoNotesEdit, 3, 1, 1, 3);
-    infoGrid->setColumnStretch(1, 1);
-    infoGrid->setColumnStretch(3, 1);
+    auto *identityRow = new QHBoxLayout;
+    identityRow->addWidget(userInfoNameValue);
+    identityRow->addStretch();
+    identityRow->addWidget(userInfoStatusValue);
 
     auto *infoLayout = new QVBoxLayout(userInfoGroup);
-    infoLayout->addLayout(infoGrid);
+    infoLayout->addLayout(identityRow);
+    infoLayout->addWidget(sublineLabel);
+    infoLayout->addLayout(cardsRow);
+    infoLayout->addWidget(userInfoNotesLabel);
+    infoLayout->addWidget(userInfoNotesEdit);
 
     auto configureTable = [](QTableWidget *table) {
         table->setSelectionBehavior(QAbstractItemView::SelectRows);
@@ -136,19 +168,27 @@ TabModeration::TabModeration(TabSupervisor *_tabSupervisor, AbstractClient *_cli
         table->horizontalHeader()->setStretchLastSection(true);
     };
 
-    altsGroup = new QGroupBox;
     altsTable = new QTableWidget(0, COL_ALTS_COUNT);
     configureTable(altsTable);
-    auto *altsLayout = new QVBoxLayout(altsGroup);
+    connectTableActivation(altsTable, this, [this](const QModelIndex &index) {
+        if (!index.isValid()) {
+            return;
+        }
+        auto *userItem = altsTable->item(index.row(), COL_ALTS_USER);
+        if (userItem != nullptr && !userItem->text().isEmpty()) {
+            getTabSupervisor()->openTabAlts(userItem->text());
+        }
+    });
+    auto *altsPage = new QWidget;
+    auto *altsLayout = new QVBoxLayout(altsPage);
     altsLayout->addWidget(altsTable);
 
-    sessionsGroup = new QGroupBox;
     sessionsTable = new QTableWidget(0, COL_SESSIONS_COUNT);
     configureTable(sessionsTable);
-    auto *sessionsLayout = new QVBoxLayout(sessionsGroup);
+    auto *sessionsPage = new QWidget;
+    auto *sessionsLayout = new QVBoxLayout(sessionsPage);
     sessionsLayout->addWidget(sessionsTable);
 
-    staffGroup = new QGroupBox;
     staffTable = new QTableWidget(0, COL_STAFF_COUNT);
     configureTable(staffTable);
     refreshStaffButton = new QPushButton;
@@ -156,19 +196,21 @@ TabModeration::TabModeration(TabSupervisor *_tabSupervisor, AbstractClient *_cli
     auto *staffHeader = new QHBoxLayout;
     staffHeader->addStretch();
     staffHeader->addWidget(refreshStaffButton);
-    auto *staffLayout = new QVBoxLayout(staffGroup);
+    auto *staffPage = new QWidget;
+    auto *staffLayout = new QVBoxLayout(staffPage);
     staffLayout->addWidget(staffTable);
     staffLayout->addLayout(staffHeader);
 
+    sectionTabs = new QTabWidget;
+    sectionTabs->addTab(altsPage, QString());
+    sectionTabs->addTab(sessionsPage, QString());
+    sectionTabs->addTab(staffPage, QString());
+
     auto *splitter = new QSplitter(Qt::Vertical);
     splitter->addWidget(userInfoGroup);
-    splitter->addWidget(altsGroup);
-    splitter->addWidget(sessionsGroup);
-    splitter->addWidget(staffGroup);
+    splitter->addWidget(sectionTabs);
     splitter->setStretchFactor(0, 1);
     splitter->setStretchFactor(1, 2);
-    splitter->setStretchFactor(2, 2);
-    splitter->setStretchFactor(3, 1);
 
     auto *mainLayout = new QVBoxLayout(centralWidget);
     mainLayout->addLayout(topBar);
@@ -189,19 +231,28 @@ void TabModeration::retranslateUi()
     refreshStaffButton->setText(tr("Refresh"));
 
     userInfoGroup->setTitle(tr("User Info"));
-    userInfoNameLabel->setText(tr("Name:"));
-    userInfoRegisteredLabel->setText(tr("Registered:"));
-    userInfoLastLoginLabel->setText(tr("Last login:"));
-    userInfoStatusLabel->setText(tr("Status:"));
-    userInfoCountsLabel->setText(tr("Counts:"));
     userInfoNotesLabel->setText(tr("Admin notes:"));
+    cardReports->setTitle(tr("Reports"));
+    cardWarns->setTitle(tr("Warnings"));
+    cardBans->setTitle(tr("Bans"));
+    altsCard->setTitle(tr("Alts"));
+    openAltsButton->setText(tr("Open graph"));
+    openAltsButton->setToolTip(tr("Open this user in the User Alts tab"));
 
-    altsGroup->setTitle(tr("Alts"));
-    sessionsGroup->setTitle(tr("Sessions"));
-    staffGroup->setTitle(tr("Staff Last Logins"));
+    sectionTabs->setTabText(0, tr("Alts"));
+    sectionTabs->setTabText(1, tr("Sessions"));
+    sectionTabs->setTabText(2, tr("Staff Last Logins"));
+
+    if (cachedUserInfoValid) {
+        applyUserInfo();
+    }
+    if (cachedAltsCount >= 0) {
+        applyAltsCount();
+    }
 
     altsTable->setHorizontalHeaderLabels({tr("User"), tr("eMail"), tr("Client ID"), tr("Registered"), tr("Last login"),
                                           tr("Warns"), tr("Bans"), tr("Active")});
+    altsTable->setToolTip(tr("Double-click or press Enter on a row to open it in the User Alts tab"));
     sessionsTable->setHorizontalHeaderLabels({tr("IP"), tr("Client ID"), tr("Start"), tr("End"), tr("Type")});
     staffTable->setHorizontalHeaderLabels({tr("User"), tr("Level"), tr("Last login")});
 }
@@ -217,16 +268,21 @@ QString TabModeration::formatEpoch(quint64 ts) const
 void TabModeration::clearUserData()
 {
     currentUser.clear();
+    cachedUserInfoValid = false;
+    cachedAltsCount = -1;
     userInfoNameValue->clear();
-    userInfoRegisteredValue->clear();
-    userInfoLastLoginValue->clear();
     userInfoStatusValue->clear();
-    userInfoCountsValue->clear();
+    sublineLabel->clear();
+    cardReportsValue->setText(QStringLiteral("–"));
+    cardWarnsValue->setText(QStringLiteral("–"));
+    cardBansValue->setText(QStringLiteral("–"));
+    altsCountValue->setText(QStringLiteral("–"));
     userInfoNotesEdit->clear();
     altsTable->setRowCount(0);
     sessionsTable->setRowCount(0);
     resetPasswordButton->setEnabled(false);
     removeAvatarButton->setEnabled(false);
+    openAltsButton->setEnabled(false);
 }
 
 void TabModeration::investigate(const QString &userName)
@@ -245,8 +301,12 @@ void TabModeration::investigateUser()
         return;
     }
     currentUser = userName;
+    cachedUserInfoValid = false;
+    cachedAltsCount = -1;
     resetPasswordButton->setEnabled(true);
     removeAvatarButton->setEnabled(true);
+    openAltsButton->setEnabled(true);
+    altsCountValue->setText(QStringLiteral("…"));
     altsTable->setRowCount(0);
     sessionsTable->setRowCount(0);
     requestUserInfo(userName);
@@ -254,13 +314,22 @@ void TabModeration::investigateUser()
     requestAlts(userName);
 }
 
+void TabModeration::openAltsGraph()
+{
+    if (currentUser.isEmpty()) {
+        return;
+    }
+    getTabSupervisor()->openTabAlts(currentUser);
+}
+
 void TabModeration::requestUserInfo(const QString &userName)
 {
     userInfoNameValue->setText(userName);
-    userInfoRegisteredValue->setText(tr("Loading..."));
-    userInfoLastLoginValue->setText(tr("Loading..."));
+    sublineLabel->setText(tr("Loading..."));
     userInfoStatusValue->clear();
-    userInfoCountsValue->clear();
+    cardReportsValue->setText(QStringLiteral("…"));
+    cardWarnsValue->setText(QStringLiteral("…"));
+    cardBansValue->setText(QStringLiteral("…"));
     userInfoNotesEdit->clear();
 
     Command_ReportUserInfo cmd;
@@ -273,9 +342,12 @@ void TabModeration::requestUserInfo(const QString &userName)
 void TabModeration::userInfoResponse(const Response &response)
 {
     if (response.response_code() != Response::RespOk) {
-        userInfoRegisteredValue->clear();
-        userInfoLastLoginValue->clear();
+        cachedUserInfoValid = false;
+        sublineLabel->clear();
         userInfoStatusValue->setText(tr("Error loading user info."));
+        cardReportsValue->setText(QStringLiteral("–"));
+        cardWarnsValue->setText(QStringLiteral("–"));
+        cardBansValue->setText(QStringLiteral("–"));
         return;
     }
 
@@ -284,20 +356,28 @@ void TabModeration::userInfoResponse(const Response &response)
         return;
     }
 
-    userInfoRegisteredValue->setText(formatEpoch(resp.registration_time()));
-    userInfoLastLoginValue->setText(formatEpoch(resp.last_login()));
+    cachedUserInfo.CopyFrom(resp);
+    cachedUserInfoValid = true;
+    applyUserInfo();
+}
+
+void TabModeration::applyUserInfo()
+{
+    const Response_ReportUserInfo &resp = cachedUserInfo;
+    sublineLabel->setText(tr("Registered %1 · Last login %2")
+                              .arg(formatEpoch(resp.registration_time()))
+                              .arg(formatEpoch(resp.last_login())));
 
     QStringList statusParts;
     statusParts << (resp.is_active() ? tr("active") : tr("inactive"));
     if (resp.has_is_admin() && resp.is_admin()) {
         statusParts << tr("admin");
     }
-    userInfoStatusValue->setText(statusParts.join(", "));
+    userInfoStatusValue->setText(statusParts.join(QStringLiteral(", ")));
 
-    userInfoCountsValue->setText(tr("Reports: %1   Bans: %2   Warnings: %3")
-                                     .arg(resp.total_reports())
-                                     .arg(resp.total_bans())
-                                     .arg(resp.total_warns()));
+    cardReportsValue->setText(QString::number(resp.total_reports()));
+    cardWarnsValue->setText(QString::number(resp.total_warns()));
+    cardBansValue->setText(QString::number(resp.total_bans()));
 
     if (resp.has_admin_notes() && !resp.admin_notes().empty()) {
         userInfoNotesEdit->setPlainText(QString::fromStdString(resp.admin_notes()));
@@ -306,12 +386,21 @@ void TabModeration::userInfoResponse(const Response &response)
     }
 }
 
+void TabModeration::applyAltsCount()
+{
+    altsCountValue->setText(tr("%1 related").arg(cachedAltsCount));
+}
+
 void TabModeration::requestSessions(const QString &userName)
 {
     Command_GetUserSessions cmd;
     cmd.set_user_name(userName.toStdString());
     PendingCommand *pend = client->prepareModeratorCommand(cmd);
-    connect(pend, &PendingCommand::finished, this, &TabModeration::sessionsResponse);
+    connect(pend, &PendingCommand::finished, this, [this, userName](const Response &response) {
+        if (userName == currentUser) {
+            sessionsResponse(response);
+        }
+    });
     client->sendCommand(pend);
 }
 
@@ -343,7 +432,11 @@ void TabModeration::requestAlts(const QString &userName)
     Command_GetUserAlts cmd;
     cmd.set_user_name(userName.toStdString());
     PendingCommand *pend = client->prepareModeratorCommand(cmd);
-    connect(pend, &PendingCommand::finished, this, &TabModeration::altsResponse);
+    connect(pend, &PendingCommand::finished, this, [this, userName](const Response &response) {
+        if (userName == currentUser) {
+            altsResponse(response);
+        }
+    });
     client->sendCommand(pend);
 }
 
@@ -351,10 +444,21 @@ void TabModeration::altsResponse(const Response &response)
 {
     altsTable->setRowCount(0);
     if (response.response_code() != Response::RespOk) {
+        cachedAltsCount = -1;
+        altsCountValue->setText(QStringLiteral("–"));
         return;
     }
 
     const Response_UserAlts &resp = response.GetExtension(Response_UserAlts::ext);
+    // The server always includes the frontier user as a depth-0 seed row.
+    int relatedCount = 0;
+    for (int i = 0; i < resp.alts_size(); ++i) {
+        if (!resp.alts(i).has_depth() || resp.alts(i).depth() > 0) {
+            ++relatedCount;
+        }
+    }
+    cachedAltsCount = relatedCount;
+    applyAltsCount();
     altsTable->setRowCount(resp.alts_size());
     for (int i = 0; i < resp.alts_size(); ++i) {
         const ServerInfo_UserAlt &alt = resp.alts(i);

cockatrice/src/interface/widgets/tabs/tab_moderation.h

@@ -5,6 +5,7 @@
 
 #include <QString>
 #include <QtGlobal>
+#include <libcockatrice/protocol/pb/response_report_user_info.pb.h>
 #include <qtmetamacros.h>
 
 class AbstractClient;
@@ -13,6 +14,7 @@ class QLabel;
 class QLineEdit;
 class QPushButton;
 class QTableWidget;
+class QTabWidget;
 class QTextEdit;
 class Response;
 class TabSupervisor;
@@ -36,6 +38,7 @@ public:
 
 private slots:
     void investigateUser();
+    void openAltsGraph();
     void userInfoResponse(const Response &response);
     void sessionsResponse(const Response &response);
     void altsResponse(const Response &response);
@@ -51,10 +54,15 @@ private:
     void requestAlts(const QString &userName);
     void requestModeratorLogins();
     void clearUserData();
+    void applyUserInfo();
+    void applyAltsCount();
     [[nodiscard]] QString formatEpoch(quint64 ts) const;
 
     AbstractClient *client;
     QString currentUser;
+    Response_ReportUserInfo cachedUserInfo;
+    bool cachedUserInfoValid = false;
+    int cachedAltsCount = -1;
 
     QLineEdit *searchEdit;
     QPushButton *investigateButton;
@@ -62,25 +70,25 @@ private:
     QPushButton *removeAvatarButton;
 
     QGroupBox *userInfoGroup;
-    QLabel *userInfoNameLabel;
     QLabel *userInfoNameValue;
-    QLabel *userInfoRegisteredLabel;
-    QLabel *userInfoRegisteredValue;
-    QLabel *userInfoLastLoginLabel;
-    QLabel *userInfoLastLoginValue;
-    QLabel *userInfoStatusLabel;
     QLabel *userInfoStatusValue;
-    QLabel *userInfoCountsLabel;
-    QLabel *userInfoCountsValue;
+    QLabel *sublineLabel;
+    QGroupBox *cardReports;
+    QGroupBox *cardWarns;
+    QGroupBox *cardBans;
+    QGroupBox *altsCard;
+    QLabel *cardReportsValue;
+    QLabel *cardWarnsValue;
+    QLabel *cardBansValue;
+    QLabel *altsCountValue;
     QLabel *userInfoNotesLabel;
     QTextEdit *userInfoNotesEdit;
 
-    QGroupBox *altsGroup;
+    QTabWidget *sectionTabs;
     QTableWidget *altsTable;
-    QGroupBox *sessionsGroup;
     QTableWidget *sessionsTable;
-    QGroupBox *staffGroup;
     QTableWidget *staffTable;
+    QPushButton *openAltsButton;
     QPushButton *refreshStaffButton;
 };
 

cockatrice/src/interface/widgets/tabs/tab_report.cpp

@@ -4,6 +4,7 @@
 #include "../utility/report_utils.h"
 #include "abstract_client.h"
 #include "libcockatrice/protocol/pb/response.pb.h"
+#include "report_status_delegate.h"
 #include "tab_supervisor.h"
 
 #include <QAbstractItemView>
@@ -24,7 +25,7 @@
 #include <QPushButton>
 #include <QSharedPointer>
 #include <QSignalBlocker>
-#include <QSplitter>
+#include <QTabWidget>
 #include <QTableWidget>
 #include <QTableWidgetItem>
 #include <QTextCursor>
@@ -125,17 +126,34 @@ TabReport::TabReport(TabSupervisor *_tabSupervisor, AbstractClient *_client) : T
     connect(table, &QTableWidget::itemSelectionChanged, this, &TabReport::onSelectionChanged);
     table->setContextMenuPolicy(Qt::CustomContextMenu);
     connect(table, &QTableWidget::customContextMenuRequested, this, &TabReport::showTableContextMenu);
+    table->setItemDelegateForColumn(COL_STATUS, new ReportStatusDelegate(table));
     userContextMenu = new UserContextMenu(tabSupervisor, this);
     connect(userContextMenu, &UserContextMenu::openMessageDialog, this, &TabReport::openMessageDialog);
 
-    descGroup = new QGroupBox;
+    reportHeaderName = new QLabel;
+    QFont displayFont = reportHeaderName->font();
+    displayFont.setPointSize(displayFont.pointSize() + 6);
+    displayFont.setBold(true);
+    reportHeaderName->setFont(displayFont);
+    reportHeaderStatus = new QLabel;
+    QFont statusFont = reportHeaderStatus->font();
+    statusFont.setBold(true);
+    reportHeaderStatus->setFont(statusFont);
+    reportHeaderSubline = new QLabel;
+
+    auto *reportIdentityRow = new QHBoxLayout;
+    reportIdentityRow->addWidget(reportHeaderName);
+    reportIdentityRow->addStretch();
+    reportIdentityRow->addWidget(reportHeaderStatus);
+
+    auto *descPage = new QWidget;
     descriptionEdit = new QTextEdit;
     descriptionEdit->setReadOnly(true);
-    auto *descLayout = new QVBoxLayout(descGroup);
+    auto *descLayout = new QVBoxLayout(descPage);
     descLayout->setContentsMargins(4, 4, 4, 4);
     descLayout->addWidget(descriptionEdit);
 
-    chatGroup = new QGroupBox;
+    auto *chatPage = new QWidget;
     chatLogEdit = new QTextEdit;
     chatLogEdit->setReadOnly(true);
     QFont monoFont("monospace");
@@ -145,11 +163,11 @@ TabReport::TabReport(TabSupervisor *_tabSupervisor, AbstractClient *_client) : T
         monoFont.setPointSize(systemPointSize);
     }
     chatLogEdit->setFont(monoFont);
-    auto *chatLayout = new QVBoxLayout(chatGroup);
+    auto *chatLayout = new QVBoxLayout(chatPage);
     chatLayout->setContentsMargins(4, 4, 4, 4);
     chatLayout->addWidget(chatLogEdit);
 
-    commentsGroup = new QGroupBox;
+    auto *commentsPage = new QWidget;
     commentsEdit = new QTextEdit;
     commentsEdit->setReadOnly(true);
     auto *commentInputRow = new QHBoxLayout;
@@ -160,12 +178,12 @@ TabReport::TabReport(TabSupervisor *_tabSupervisor, AbstractClient *_client) : T
     connect(commentInput, &QLineEdit::returnPressed, this, &TabReport::addComment);
     commentInputRow->addWidget(commentInput);
     commentInputRow->addWidget(commentButton);
-    auto *commentsLayout = new QVBoxLayout(commentsGroup);
+    auto *commentsLayout = new QVBoxLayout(commentsPage);
     commentsLayout->setContentsMargins(4, 4, 4, 4);
     commentsLayout->addWidget(commentsEdit);
     commentsLayout->addLayout(commentInputRow);
 
-    userContextGroup = new QGroupBox;
+    auto *userPage = new QWidget;
     userContextName = new QLabel;
     userContextAccountAge = new QLabel;
     userContextReports = new QLabel;
@@ -184,7 +202,7 @@ TabReport::TabReport(TabSupervisor *_tabSupervisor, AbstractClient *_client) : T
     userContextWarnsLabel = new QLabel;
     userContextNotesLabel = new QLabel;
     userContextRecentReportsLabel = new QLabel;
-    auto *ucLayout = new QGridLayout(userContextGroup);
+    auto *ucLayout = new QGridLayout(userPage);
     ucLayout->setContentsMargins(8, 8, 8, 8);
     ucLayout->addWidget(userContextUserLabel, 0, 0);
     ucLayout->addWidget(userContextName, 0, 1, 1, 3);
@@ -200,7 +218,6 @@ TabReport::TabReport(TabSupervisor *_tabSupervisor, AbstractClient *_client) : T
     ucLayout->addWidget(userContextNotes, 3, 1, 1, 3);
     ucLayout->addWidget(userContextRecentReportsLabel, 4, 0, 1, 4);
     ucLayout->addWidget(userContextRecentReports, 5, 0, 1, 4);
-    userContextGroup->setVisible(false);
 
     statsGroup = new QGroupBox;
     statsGroup->setCheckable(true);
@@ -228,13 +245,11 @@ TabReport::TabReport(TabSupervisor *_tabSupervisor, AbstractClient *_client) : T
         }
     });
 
-    detailSplitter = new QSplitter(Qt::Vertical);
-    detailSplitter->addWidget(descGroup);
-    detailSplitter->addWidget(chatGroup);
-    detailSplitter->addWidget(commentsGroup);
-    detailSplitter->setStretchFactor(0, 1);
-    detailSplitter->setStretchFactor(1, 1);
-    detailSplitter->setStretchFactor(2, 2);
+    detailTabs = new QTabWidget;
+    detailTabs->addTab(descPage, QString());
+    detailTabs->addTab(chatPage, QString());
+    detailTabs->addTab(commentsPage, QString());
+    detailTabs->addTab(userPage, QString());
 
     assignButton = new QPushButton;
     resolveButton = new QPushButton;
@@ -266,12 +281,14 @@ TabReport::TabReport(TabSupervisor *_tabSupervisor, AbstractClient *_client) : T
     layout->addLayout(topBar);
     layout->addWidget(statsLabel);
     layout->addWidget(table, 2);
-    layout->addWidget(detailSplitter, 1);
-    layout->addWidget(userContextGroup);
+    layout->addLayout(reportIdentityRow);
+    layout->addWidget(reportHeaderSubline);
+    layout->addWidget(detailTabs, 2);
     layout->addWidget(statsGroup);
     layout->addLayout(actionBar);
 
     retranslateUi();
+    clearReportHeader();
 
     setActionsEnabled(false);
     refreshList();
@@ -293,18 +310,18 @@ void TabReport::retranslateUi()
     table->setHorizontalHeaderLabels({tr("#"), tr("Time"), tr("Reporter"), tr("Reported User"), tr("Category"),
                                       tr("Game ID"), tr("Status"), tr("Assigned To"), tr("Replay"), tr("Room")});
 
-    descGroup->setTitle(tr("Description"));
-    chatGroup->setTitle(tr("Chat Log Context"));
-    chatGroup->setToolTip(
-        tr("Chat log attached by the reporter. It is captured from their client and may be incomplete or edited."));
-    commentsGroup->setTitle(tr("Comments / Thread"));
+    detailTabs->setTabText(0, tr("Description"));
+    detailTabs->setTabText(1, tr("Chat Log Context"));
+    detailTabs->setTabToolTip(1, tr("Chat log attached by the reporter. It is captured from their client and may be "
+                                    "incomplete or edited."));
+    detailTabs->setTabText(2, tr("Comments / Thread"));
+    detailTabs->setTabText(3, tr("Reported User"));
     descriptionEdit->setPlaceholderText(tr("No description."));
     chatLogEdit->setPlaceholderText(tr("No chat log attached."));
     commentsEdit->setPlaceholderText(tr("No comments yet."));
     commentInput->setPlaceholderText(tr("Type a reply..."));
     commentButton->setText(tr("Send"));
 
-    userContextGroup->setTitle(tr("Reported User Context"));
     userContextUserLabel->setText(tr("User:"));
     userContextAgeLabel->setText(tr("Account Age:"));
     userContextReportsLabel->setText(tr("Reports:"));
@@ -312,10 +329,18 @@ void TabReport::retranslateUi()
     userContextWarnsLabel->setText(tr("Warns:"));
     userContextNotesLabel->setText(tr("Admin Notes:"));
     userContextRecentReportsLabel->setText(tr("Recent Reports Against User:"));
-    userContextAccountAge->setText(QString());
-    userContextReports->setText(QString());
-    userContextBans->setText(QString());
-    userContextWarns->setText(QString());
+
+    if (headerReportId >= 0) {
+        for (const ServerInfo_Report &r : filteredReports) {
+            if (r.report_id() == headerReportId) {
+                updateReportHeader(r);
+                const QString status = QString::fromStdString(r.status());
+                const bool canComment = (status == "open" || status == "assigned");
+                commentInput->setPlaceholderText(canComment ? tr("Type a reply...") : tr("This report is closed."));
+                break;
+            }
+        }
+    }
 
     statsGroup->setTitle(tr("Report Statistics"));
 
@@ -408,7 +433,8 @@ void TabReport::reportListResponse(const Response &response)
             chatLogEdit->clear();
             commentsEdit->clear();
             setActionsEnabled(false);
-            userContextGroup->setVisible(false);
+            clearReportHeader();
+            clearUserContext();
         }
     }
 
@@ -445,11 +471,14 @@ void TabReport::applyFilters()
     table->setSortingEnabled(false);
     table->setRowCount(filteredReports.size());
 
+    QFont reportedFont = table->font();
+    reportedFont.setBold(true);
+
     for (int row = 0; row < filteredReports.size(); ++row) {
         const ServerInfo_Report &r = filteredReports[row];
 
         report_utils::fillReportTableRow(table, row, r, COL_ID, COL_TIME, COL_REPORTED, COL_CATEGORY, COL_GAMEID,
-                                         COL_STATUS, COL_ASSIGNED);
+                                         COL_STATUS, COL_ASSIGNED, false);
 
         table->setItem(row, COL_REPORTER, new QTableWidgetItem(QString::fromStdString(r.reporter_name())));
 
@@ -458,12 +487,30 @@ void TabReport::applyFilters()
 
         table->setItem(row, COL_ROOM,
                        new QTableWidgetItem(r.has_room_id() && r.room_id() > 0 ? QString::number(r.room_id()) : ""));
+
+        if (auto *reportedItem = table->item(row, COL_REPORTED)) {
+            reportedItem->setFont(reportedFont);
+        }
     }
 
     table->setSortingEnabled(true);
     table->resizeColumnsToContents();
     table->horizontalHeader()->setSectionResizeMode(COL_REPORTED, QHeaderView::Stretch);
 
+    if (headerReportId >= 0) {
+        bool stillVisible = false;
+        for (const ServerInfo_Report &r : filteredReports) {
+            if (r.report_id() == headerReportId) {
+                stillVisible = true;
+                break;
+            }
+        }
+        if (!stillVisible) {
+            clearReportHeader();
+            clearUserContext();
+        }
+    }
+
     statusLabel->setText(tr("%1 report(s)").arg(filteredReports.size()));
 }
 
@@ -490,6 +537,31 @@ void TabReport::updateStats()
                             .arg(dismissed));
 }
 
+void TabReport::updateReportHeader(const ServerInfo_Report &report)
+{
+    reportHeaderName->setText(QString::fromStdString(report.reported_user_name()));
+    reportHeaderStatus->setText(report_utils::formatReportStatus(QString::fromStdString(report.status())));
+
+    QStringList parts;
+    parts << QString::fromStdString(report.category());
+    parts << QDateTime::fromSecsSinceEpoch(report.report_time()).toLocalTime().toString("yyyy-MM-dd HH:mm");
+    if (report.has_room_id() && report.room_id() > 0) {
+        parts << tr("Room %1").arg(report.room_id());
+    }
+    if (report.game_id() > 0) {
+        parts << tr("Game %1").arg(report.game_id());
+    }
+    reportHeaderSubline->setText(parts.join(QStringLiteral(" · ")));
+}
+
+void TabReport::clearReportHeader()
+{
+    headerReportId = -1;
+    reportHeaderName->setText(tr("Select a report to inspect."));
+    reportHeaderStatus->clear();
+    reportHeaderSubline->clear();
+}
+
 void TabReport::onSelectionChanged()
 {
     const int row = table->currentRow();
@@ -500,7 +572,8 @@ void TabReport::onSelectionChanged()
         commentInput->clear();
         commentButton->setEnabled(false);
         setActionsEnabled(false);
-        userContextGroup->setVisible(false);
+        clearReportHeader();
+        clearUserContext();
         return;
     }
 
@@ -509,6 +582,18 @@ void TabReport::onSelectionChanged()
     updateActionStates();
 }
 
+void TabReport::clearUserContext()
+{
+    lastRequestedUser.clear();
+    userContextName->setText(tr("—"));
+    userContextAccountAge->clear();
+    userContextReports->clear();
+    userContextBans->clear();
+    userContextWarns->clear();
+    userContextNotes->setPlainText(tr("Select a report to inspect."));
+    userContextRecentReports->clear();
+}
+
 void TabReport::showTableContextMenu(const QPoint &pos)
 {
     QTableWidgetItem *clickedItem = table->itemAt(pos);
@@ -546,12 +631,17 @@ void TabReport::loadReportDetails(int reportId)
     for (const ServerInfo_Report &r : filteredReports) {
         if (r.report_id() == reportId) {
             descriptionEdit->setPlainText(QString::fromStdString(r.description()));
+            updateReportHeader(r);
+            if (headerReportId != reportId) {
+                headerReportId = reportId;
+                detailTabs->setCurrentIndex(0);
+            }
 
             QString reportedUser = QString::fromStdString(r.reported_user_name());
             if (!reportedUser.isEmpty()) {
                 requestUserInfo(reportedUser);
             } else {
-                userContextGroup->setVisible(false);
+                clearUserContext();
             }
 
             QString status = QString::fromStdString(r.status());
@@ -871,12 +961,11 @@ void TabReport::addCommentResponse(const Response &response)
 void TabReport::requestUserInfo(const QString &userName)
 {
     if (userName.isEmpty()) {
-        userContextGroup->setVisible(false);
+        clearUserContext();
         return;
     }
 
     lastRequestedUser = userName;
-    userContextGroup->setVisible(true);
     userContextName->setText(userName);
     userContextAccountAge->setText(tr("Loading..."));
     userContextReports->clear();

cockatrice/src/interface/widgets/tabs/tab_report.h

@@ -16,8 +16,8 @@ class QGroupBox;
 class QLabel;
 class QLineEdit;
 class QPushButton;
-class QSplitter;
 class QTableWidget;
+class QTabWidget;
 class QTextEdit;
 class QTimer;
 class GameReplay;
@@ -71,6 +71,9 @@ private:
     void applyFilters();
     void updateStats();
     void loadReportDetails(int reportId);
+    void updateReportHeader(const ServerInfo_Report &report);
+    void clearReportHeader();
+    void clearUserContext();
 
     AbstractClient *client;
 
@@ -80,10 +83,10 @@ private:
     QPushButton *refreshButton;
     QLabel *statsLabel;
     QTableWidget *table;
-    QSplitter *detailSplitter;
-    QGroupBox *descGroup;
-    QGroupBox *chatGroup;
-    QGroupBox *commentsGroup;
+    QLabel *reportHeaderName;
+    QLabel *reportHeaderStatus;
+    QLabel *reportHeaderSubline;
+    QTabWidget *detailTabs;
     QTextEdit *descriptionEdit;
     QTextEdit *chatLogEdit;
     QTextEdit *commentsEdit;
@@ -99,7 +102,6 @@ private:
     QTimer *refreshTimer;
     UserContextMenu *userContextMenu;
 
-    QGroupBox *userContextGroup;
     QLabel *userContextName;
     QLabel *userContextAccountAge;
     QLabel *userContextReports;
@@ -124,6 +126,7 @@ private:
 
     QList<ServerInfo_Report> allReports;
     QList<ServerInfo_Report> filteredReports;
+    int headerReportId = -1;
     int detailsRequestedReportId = -1;
     int detailsRequestSeq = 0;
     int selectedReportIdBeforeRefresh = -1;

cockatrice/src/interface/widgets/tabs/tab_supervisor.cpp

@@ -25,6 +25,7 @@
 #include "tab.h"
 #include "tab_account.h"
 #include "tab_admin.h"
+#include "tab_alts.h"
 #include "tab_card_art_rules.h"
 #include "tab_deck_editor.h"
 #include "tab_deck_storage.h"
@@ -156,7 +157,7 @@ TabSupervisor::TabSupervisor(AbstractClient *_client, QMenu *tabsMenu, QWidget *
     : QTabWidget(parent), userInfo(nullptr), client(_client), tabsMenu(tabsMenu), tabHome(nullptr),
       tabVisualDeckStorage(nullptr), tabServer(nullptr), tabAccount(nullptr), tabDeckStorage(nullptr),
       tabReplays(nullptr), tabAdmin(nullptr), tabCardArtRules(nullptr), tabLog(nullptr), tabReport(nullptr),
-      tabModeration(nullptr), tabDeveloper(nullptr), isLocalGame(false)
+      tabModeration(nullptr), tabAlts(nullptr), tabDeveloper(nullptr), isLocalGame(false)
 {
     setElideMode(Qt::ElideRight);
     setMovable(true);
@@ -300,6 +301,7 @@ void TabSupervisor::retranslateUi()
     tabs.append(tabLog);
     tabs.append(tabReport);
     tabs.append(tabModeration);
+    tabs.append(tabAlts);
     tabs.append(tabCardArtRules);
     tabs.append(tabDeveloper);
     QMapIterator<int, TabRoom *> roomIterator(roomTabs);
@@ -600,6 +602,7 @@ void TabSupervisor::startLocal(const QList<AbstractClient *> &_clients)
     tabLog = nullptr;
     tabReport = nullptr;
     tabModeration = nullptr;
+    tabAlts = nullptr;
     tabDeveloper = nullptr;
     isLocalGame = true;
     userInfo = new ServerInfo_User;
@@ -648,6 +651,9 @@ void TabSupervisor::stop()
         if (tabModeration) {
             tabModeration->close();
         }
+        if (tabAlts) {
+            tabAlts->close();
+        }
         if (tabCardArtRules) {
             tabCardArtRules->close();
         }
@@ -956,6 +962,20 @@ void TabSupervisor::openTabModeration(const QString &userName)
     aTabModeration->setChecked(true);
 }
 
+void TabSupervisor::openTabAlts(const QString &userName)
+{
+    if (tabAlts) {
+        setCurrentWidget(tabAlts);
+        if (!userName.isEmpty()) {
+            tabAlts->investigate(userName);
+        }
+        return;
+    }
+    tabAlts = new TabAlts(this, client, userName);
+    myAddTab(tabAlts);
+    connect(tabAlts, &QObject::destroyed, this, [this] { tabAlts = nullptr; });
+}
+
 void TabSupervisor::actTabDeveloper(bool checked)
 {
     if (checked && !tabDeveloper) {

cockatrice/src/interface/widgets/tabs/tab_supervisor.h

@@ -50,6 +50,7 @@ class TabAdmin;
 class TabMessage;
 class TabReport;
 class TabModeration;
+class TabAlts;
 class TabAccount;
 class TabDeckEditor;
 class TabDeveloper;
@@ -116,6 +117,7 @@ private:
     TabLog *tabLog;
     TabReport *tabReport;
     TabModeration *tabModeration;
+    TabAlts *tabAlts;
     TabDeveloper *tabDeveloper;
     QMap<int, TabRoom *> roomTabs;
     QMap<int, TabGame *> gameTabs;
@@ -209,6 +211,7 @@ public slots:
     /** Joins or spectates a game listed on a user's profile hover card. */
     void joinGameFromUserCard(int gameId, int roomId, bool asSpectator);
     void openTabModeration(const QString &userName = {});
+    void openTabAlts(const QString &userName = {});
     void switchToFirstAvailableNetworkTab();
     void maximizeMainWindow();
     void actTabVisualDeckStorage(bool checked);

cockatrice/src/interface/widgets/utility/pill_painter.cpp

@@ -0,0 +1,41 @@
+#include "pill_painter.h"
+
+#include <QApplication>
+#include <QFontMetrics>
+#include <QPainter>
+#include <QRect>
+#include <QStyle>
+#include <QStyleOptionViewItem>
+
+namespace
+{
+constexpr qreal PILL_ALPHA = 0.30;
+} // namespace
+
+bool pill_painter::paint(QPainter *painter,
+                         const QStyleOptionViewItem &option,
+                         QPalette::ColorRole tintRole,
+                         QPalette::ColorRole textRole,
+                         const QString &text)
+{
+    const QRect pillRect = option.rect.adjusted(PAD_X / 2, PAD_Y / 2, -PAD_X / 2, -PAD_Y / 2);
+    if (pillRect.width() <= 0 || pillRect.height() <= 0) {
+        return false;
+    }
+
+    if ((option.state & QStyle::State_Selected) == 0) {
+        painter->save();
+        painter->setRenderHint(QPainter::Antialiasing, true);
+        QColor pill = option.palette.color(tintRole);
+        pill.setAlphaF(PILL_ALPHA);
+        painter->setPen(Qt::NoPen);
+        painter->setBrush(pill);
+        painter->drawRoundedRect(pillRect, pillRect.height() / 2.0, pillRect.height() / 2.0);
+        painter->restore();
+    }
+
+    QStyle *style = option.widget != nullptr ? option.widget->style() : QApplication::style();
+    const QString elided = option.fontMetrics.elidedText(text, option.textElideMode, pillRect.width());
+    style->drawItemText(painter, pillRect, Qt::AlignCenter, option.palette, true, elided, textRole);
+    return true;
+}

cockatrice/src/interface/widgets/utility/pill_painter.h

@@ -0,0 +1,29 @@
+#ifndef PILL_PAINTER_H
+#define PILL_PAINTER_H
+
+#include <QPalette>
+#include <QString>
+
+class QPainter;
+class QStyleOptionViewItem;
+
+namespace pill_painter
+{
+constexpr int PAD_X = 10;
+constexpr int PAD_Y = 4;
+
+/**
+ * Draws a translucent, palette-tinted rounded pill inside the option's rect and
+ * paints the text elided and centred on it, so badges follow the active theme.
+ * Returns false when the cell is too small to hold a pill, leaving the caller to
+ * fall back to default painting.
+ */
+bool paint(QPainter *painter,
+           const QStyleOptionViewItem &option,
+           QPalette::ColorRole tintRole,
+           QPalette::ColorRole textRole,
+           const QString &text);
+
+} // namespace pill_painter
+
+#endif // PILL_PAINTER_H

cockatrice/src/interface/widgets/utility/report_utils.cpp

@@ -64,6 +64,23 @@ QString formatReportTime(qint64 secondsSinceEpoch)
     return dt.toString("yyyy-MM-dd hh:mm");
 }
 
+QString formatReportStatus(const QString &status)
+{
+    if (status == QStringLiteral("open")) {
+        return QObject::tr("Open");
+    }
+    if (status == QStringLiteral("assigned")) {
+        return QObject::tr("Assigned");
+    }
+    if (status == QStringLiteral("resolved")) {
+        return QObject::tr("Resolved");
+    }
+    if (status == QStringLiteral("dismissed")) {
+        return QObject::tr("Dismissed");
+    }
+    return status;
+}
+
 void fillReportTableRow(QTableWidget *table,
                         int row,
                         const ServerInfo_Report &report,
@@ -73,7 +90,8 @@ void fillReportTableRow(QTableWidget *table,
                         int categoryColumn,
                         int gameIdColumn,
                         int statusColumn,
-                        int assignedColumn)
+                        int assignedColumn,
+                        bool colorizeStatus)
 {
     auto *idItem = new QTableWidgetItem(QString::number(report.report_id()));
     idItem->setData(Qt::UserRole, report.report_id());
@@ -86,8 +104,12 @@ void fillReportTableRow(QTableWidget *table,
     table->setItem(row, gameIdColumn,
                    new QTableWidgetItem(report.game_id() > 0 ? QString::number(report.game_id()) : QString()));
 
-    auto *statusItem = new QTableWidgetItem(QString::fromStdString(report.status()));
-    setReportStatusItemColor(statusItem, QString::fromStdString(report.status()));
+    const QString rawStatus = QString::fromStdString(report.status());
+    auto *statusItem = new QTableWidgetItem(formatReportStatus(rawStatus));
+    statusItem->setData(Qt::UserRole, rawStatus);
+    if (colorizeStatus) {
+        setReportStatusItemColor(statusItem, rawStatus);
+    }
     table->setItem(row, statusColumn, statusItem);
 
     table->setItem(row, assignedColumn, new QTableWidgetItem(QString::fromStdString(report.assigned_mod_name())));

cockatrice/src/interface/widgets/utility/report_utils.h

@@ -13,6 +13,7 @@ namespace report_utils
 
 QString formatReportCategory(const QString &category);
 QString formatReportTime(qint64 secondsSinceEpoch);
+QString formatReportStatus(const QString &status);
 
 void fillReportTableRow(QTableWidget *table,
                         int row,
@@ -23,7 +24,8 @@ void fillReportTableRow(QTableWidget *table,
                         int categoryColumn,
                         int gameIdColumn,
                         int statusColumn,
-                        int assignedColumn);
+                        int assignedColumn,
+                        bool colorizeStatus = true);
 
 void renderReportDetails(QTextEdit *chatLogEdit,
                          QTextEdit *commentsEdit,

cockatrice/src/interface/widgets/utility/table_activation.cpp

@@ -0,0 +1,30 @@
+#include "table_activation.h"
+
+#include <QKeySequence>
+#include <QShortcut>
+#include <QTableWidget>
+
+namespace
+{
+void addActivationShortcut(QTableWidget *table,
+                           QObject *context,
+                           int key,
+                           const std::function<void(const QModelIndex &)> &handler)
+{
+    auto *shortcut = new QShortcut(QKeySequence(key), table);
+    // The table's viewport takes focus, so match children as well.
+    shortcut->setContext(Qt::WidgetWithChildrenShortcut);
+    QObject::connect(shortcut, &QShortcut::activated, context, [table, handler] {
+        handler(table->currentIndex());
+    });
+}
+} // namespace
+
+void connectTableActivation(QTableWidget *table,
+                            QObject *context,
+                            const std::function<void(const QModelIndex &)> &handler)
+{
+    QObject::connect(table, &QTableWidget::doubleClicked, context, handler);
+    addActivationShortcut(table, context, Qt::Key_Return, handler);
+    addActivationShortcut(table, context, Qt::Key_Enter, handler);
+}

cockatrice/src/interface/widgets/utility/table_activation.h

@@ -0,0 +1,31 @@
+/**
+ * @file table_activation.h
+ * @brief Row activation for tables that must not navigate on a single click.
+ */
+
+#ifndef TABLE_ACTIVATION_H
+#define TABLE_ACTIVATION_H
+
+#include <functional>
+
+class QModelIndex;
+class QObject;
+class QTableWidget;
+
+/**
+ * @brief Call @p handler on double-click or Enter, never on a single click.
+ *
+ * QAbstractItemView::activated fires on a single click on platforms where
+ * SH_ItemView_ActivateItemOnSingleClick is set, so navigation actions must not
+ * use it. This connects doubleClicked and installs Return/Enter shortcuts that
+ * forward the current index.
+ *
+ * @param table   The table whose rows activate.
+ * @param context Object that owns the connections; the handler is disconnected
+ *                with it.
+ * @param handler Receives the activated row's index, which may be invalid.
+ */
+void connectTableActivation(QTableWidget *table, QObject *context,
+                            const std::function<void(const QModelIndex &)> &handler);
+
+#endif // TABLE_ACTIVATION_H

libcockatrice_protocol/libcockatrice/protocol/pb/moderator_commands.proto

@@ -165,6 +165,7 @@ message Command_GetUserAlts {
         optional Command_GetUserAlts ext = 1014;
     }
     optional string user_name = 1;
+    optional uint32 depth = 2 [default = 1]; // BFS depth: 1 = direct matches only, up to 3 for transitive alts-of-alts
 }
 
 message Command_GetModeratorLastLogins {

libcockatrice_protocol/libcockatrice/protocol/pb/serverinfo_user_alt.proto

@@ -13,4 +13,8 @@ message ServerInfo_UserAlt {
     optional uint32 warn_count = 6;        // number of warnings on record
     optional uint32 ban_count = 7;         // number of bans on record
     optional bool is_active = 8;           // account is not deactivated/banned
+    optional string match_reason = 9; // why flagged, e.g. "email", "clientid:abc", "ip:1.2.3.4"; empty = seed/legacy
+    optional uint32 depth = 10;       // BFS distance from investigated account; 1 = direct, 2+ = alt-of-alt
+    optional uint32 shared_count =
+        11; // distinct users sharing the matched identifier; high values suggest VPN/shared network
 }

servatrice/src/servatrice_database_interface.cpp

@@ -33,6 +33,7 @@
 #include <QStringList>
 #include <QVariant>
 #include <QVariantList>
+#include <algorithm>
 #include <google/protobuf/stubs/common.h>
 #include <libcockatrice/deck_list/deck_list.h>
 #include <libcockatrice/protocol/pb/game_replay.pb.h>
@@ -1621,7 +1622,58 @@ QList<ServerInfo_UserSession> Servatrice_DatabaseInterface::getUserSessions(cons
     return results;
 }
 
-QList<ServerInfo_UserAlt> Servatrice_DatabaseInterface::getUserAlts(const QString &userName)
+namespace
+{
+constexpr int MAX_USER_ALT_DEPTH = 3;
+constexpr int MAX_USER_ALTS_PER_LEVEL = 200;
+// Bounds per-level work and the prepared-statement cache (keyed by query text,
+// so every distinct IN-list size is a new entry on the long-lived server).
+// Identifier-heavy frontiers, e.g. VPN users with hundreds of recent IPs, are
+// truncated: this tool is deliberately a first-pass sweep, not an audit.
+constexpr int MAX_USER_ALT_IDENTIFIERS = 200;
+
+QString altInClause(const QString &prefix, const QList<QString> &values)
+{
+    QStringList placeholders;
+    placeholders.reserve(values.size());
+    for (int i = 0; i < values.size(); ++i) {
+        placeholders << prefix + QString::number(i);
+    }
+    return QStringLiteral("(") + placeholders.join(QStringLiteral(",")) + QStringLiteral(")");
+}
+
+void altBindValues(QSqlQuery *query, const QString &prefix, const QList<QString> &values)
+{
+    for (int i = 0; i < values.size(); ++i) {
+        query->bindValue(prefix + QString::number(i), values.at(i));
+    }
+}
+
+struct AltCandidate
+{
+    QString name;
+    QString email;
+    QString clientId;
+    qint64 registrationTime = 0;
+    qint64 lastLogin = 0;
+    bool hasLastLogin = false;
+    int warnCount = 0;
+    int banCount = 0;
+    bool isActive = false;
+};
+
+QList<QString> cappedIdentifiers(QSet<QString> values)
+{
+    QList<QString> list = values.values();
+    std::sort(list.begin(), list.end());
+    if (list.size() > MAX_USER_ALT_IDENTIFIERS) {
+        list.erase(list.begin() + MAX_USER_ALT_IDENTIFIERS, list.end());
+    }
+    return list;
+}
+} // namespace
+
+QList<ServerInfo_UserAlt> Servatrice_DatabaseInterface::getUserAlts(const QString &userName, int depth)
 {
     QList<ServerInfo_UserAlt> results;
 
@@ -1629,63 +1681,301 @@ QList<ServerInfo_UserAlt> Servatrice_DatabaseInterface::getUserAlts(const QStrin
         return results;
     }
 
-    // Seed account identifiers used to find related accounts
-    QSqlQuery *seedQuery = prepareQuery("SELECT email, clientid FROM {prefix}_users WHERE name = :user_name");
+    if (depth < 1) {
+        depth = 1;
+    } else if (depth > MAX_USER_ALT_DEPTH) {
+        depth = MAX_USER_ALT_DEPTH;
+    }
+
+    // Seed must exist; its row anchors the result at depth 0.
+    QSqlQuery *seedQuery = prepareQuery("SELECT u.name, u.email, u.clientid, UNIX_TIMESTAMP(u.registrationDate), "
+                                        "UNIX_TIMESTAMP(a.last_login), "
+                                        "(SELECT COUNT(*) FROM {prefix}_warnings w WHERE w.user_id = u.id), "
+                                        "(SELECT COUNT(*) FROM {prefix}_bans b WHERE b.user_name = u.name), "
+                                        "u.active "
+                                        "FROM {prefix}_users u "
+                                        "LEFT JOIN {prefix}_user_analytics a ON a.id = u.id "
+                                        "WHERE u.name = :user_name");
     seedQuery->bindValue(":user_name", userName);
     if (!execSqlQuery(seedQuery) || !seedQuery->next()) {
         return results;
     }
-    const QString seedEmail = seedQuery->value(0).toString();
-    const QString seedClientId = seedQuery->value(1).toString();
 
-    QString queryString = "SELECT u.name, u.email, u.clientid, UNIX_TIMESTAMP(u.registrationDate), "
-                          "UNIX_TIMESTAMP(a.last_login), "
-                          "(SELECT COUNT(*) FROM {prefix}_warnings w WHERE w.user_id = u.id), "
-                          "(SELECT COUNT(*) FROM {prefix}_bans b WHERE b.user_name = u.name), "
-                          "u.active "
-                          "FROM {prefix}_users u "
-                          "LEFT JOIN {prefix}_user_analytics a ON a.id = u.id "
-                          "WHERE u.name = :user_name";
-    if (!seedEmail.isEmpty()) {
-        queryString.append(" OR u.email = :seed_email");
-    }
-    if (!seedClientId.isEmpty()) {
-        queryString.append(" OR u.clientid = :seed_clientid");
-    }
-    queryString.append(" OR u.name IN (SELECT DISTINCT s.user_name FROM {prefix}_sessions s "
-                       "WHERE s.ip_address IN (SELECT DISTINCT s2.ip_address FROM {prefix}_sessions s2 "
-                       "WHERE s2.user_name = :user_name"
-                       " AND s2.start_time >= DATE_SUB(NOW(), INTERVAL 6 MONTH))"
-                       " AND s.start_time >= DATE_SUB(NOW(), INTERVAL 6 MONTH)) "
-                       "ORDER BY u.name LIMIT 200");
-
-    QSqlQuery *query = prepareQuery(queryString);
-    query->bindValue(":user_name", userName);
-    if (!seedEmail.isEmpty()) {
-        query->bindValue(":seed_email", seedEmail);
-    }
-    if (!seedClientId.isEmpty()) {
-        query->bindValue(":seed_clientid", seedClientId);
-    }
-
-    if (!execSqlQuery(query)) {
-        qCWarning(DatabaseInterfaceLog) << "Failed to collect user alt information: SQL Error";
-        return results;
-    }
-
-    while (query->next()) {
+    auto appendAlt = [&results](const AltCandidate &candidate, const QString &matchReason, int matchDepth,
+                                int sharedCount) {
         ServerInfo_UserAlt altDetails;
-        altDetails.set_user_name(query->value(0).toString().toStdString());
-        altDetails.set_email(query->value(1).toString().toStdString());
-        altDetails.set_clientid(query->value(2).toString().toStdString());
-        altDetails.set_registration_time(query->value(3).toLongLong());
-        if (!query->value(4).isNull()) {
-            altDetails.set_last_login(query->value(4).toLongLong());
+        altDetails.set_user_name(candidate.name.toStdString());
+        altDetails.set_email(candidate.email.toStdString());
+        altDetails.set_clientid(candidate.clientId.toStdString());
+        altDetails.set_registration_time(candidate.registrationTime);
+        if (candidate.hasLastLogin) {
+            altDetails.set_last_login(candidate.lastLogin);
         }
-        altDetails.set_warn_count(query->value(5).toInt());
-        altDetails.set_ban_count(query->value(6).toInt());
-        altDetails.set_is_active(query->value(7).toBool());
+        altDetails.set_warn_count(candidate.warnCount);
+        altDetails.set_ban_count(candidate.banCount);
+        altDetails.set_is_active(candidate.isActive);
+        altDetails.set_match_reason(matchReason.toStdString());
+        altDetails.set_depth(static_cast<google::protobuf::uint32>(matchDepth));
+        altDetails.set_shared_count(static_cast<google::protobuf::uint32>(sharedCount));
         results << altDetails;
+    };
+
+    AltCandidate seed{.name = seedQuery->value(0).toString(),
+                      .email = seedQuery->value(1).toString(),
+                      .clientId = seedQuery->value(2).toString(),
+                      .registrationTime = seedQuery->value(3).toLongLong(),
+                      .lastLogin = seedQuery->value(4).toLongLong(),
+                      .hasLastLogin = !seedQuery->value(4).isNull(),
+                      .warnCount = seedQuery->value(5).toInt(),
+                      .banCount = seedQuery->value(6).toInt(),
+                      .isActive = seedQuery->value(7).toBool()};
+    appendAlt(seed, QStringLiteral("self"), 0, 1);
+
+    QSet<QString> visited{userName};
+    QList<QString> frontier{userName};
+    for (int level = 1; level <= depth && !frontier.isEmpty(); ++level) {
+        const QString frontierClause = altInClause(QStringLiteral(":alt_name"), frontier);
+
+        // Current identifiers of the frontier: registration email + client id.
+        QSet<QString> emails;
+        QSet<QString> clientIds;
+        QSet<QString> ips;
+        QSqlQuery *frontierQuery =
+            prepareQuery(QStringLiteral("SELECT email, clientid FROM {prefix}_users WHERE name IN ") + frontierClause);
+        altBindValues(frontierQuery, QStringLiteral(":alt_name"), frontier);
+        if (execSqlQuery(frontierQuery)) {
+            while (frontierQuery->next()) {
+                const QString email = frontierQuery->value(0).toString();
+                const QString clientId = frontierQuery->value(1).toString();
+                if (!email.isEmpty()) {
+                    emails << email;
+                }
+                if (!clientId.isEmpty()) {
+                    clientIds << clientId;
+                }
+            }
+        }
+
+        // Recent session identifiers: IPs plus historic client ids.
+        QSqlQuery *sessionQuery = prepareQuery(
+            QStringLiteral("SELECT DISTINCT ip_address, clientid FROM {prefix}_sessions WHERE user_name IN ") +
+            frontierClause + QStringLiteral(" AND start_time >= DATE_SUB(NOW(), INTERVAL 6 MONTH)"));
+        altBindValues(sessionQuery, QStringLiteral(":alt_name"), frontier);
+        if (execSqlQuery(sessionQuery)) {
+            while (sessionQuery->next()) {
+                const QString ip = sessionQuery->value(0).toString();
+                const QString clientId = sessionQuery->value(1).toString();
+                if (!ip.isEmpty()) {
+                    ips << ip;
+                }
+                if (!clientId.isEmpty()) {
+                    clientIds << clientId;
+                }
+            }
+        }
+
+        if (emails.isEmpty() && clientIds.isEmpty() && ips.isEmpty()) {
+            break;
+        }
+
+        // Accounts sharing any frontier identifier. Historic client ids are matched
+        // through past sessions so identifier changes do not hide older alts.
+        QString candidateString =
+            QStringLiteral("SELECT u.name, u.email, u.clientid, UNIX_TIMESTAMP(u.registrationDate), "
+                           "UNIX_TIMESTAMP(a.last_login), "
+                           "(SELECT COUNT(*) FROM {prefix}_warnings w WHERE w.user_id = u.id), "
+                           "(SELECT COUNT(*) FROM {prefix}_bans b WHERE b.user_name = u.name), "
+                           "u.active "
+                           "FROM {prefix}_users u "
+                           "LEFT JOIN {prefix}_user_analytics a ON a.id = u.id "
+                           "WHERE ");
+        QStringList conditions;
+        QList<QString> emailList = cappedIdentifiers(emails);
+        QList<QString> clientIdList = cappedIdentifiers(clientIds);
+        QList<QString> ipList = cappedIdentifiers(ips);
+        if (!emailList.isEmpty()) {
+            conditions << QStringLiteral("u.email IN ") + altInClause(QStringLiteral(":alt_email"), emailList);
+        }
+        if (!clientIdList.isEmpty()) {
+            conditions << QStringLiteral("u.clientid IN ") + altInClause(QStringLiteral(":alt_cid"), clientIdList);
+        }
+        if (!ipList.isEmpty()) {
+            conditions << QStringLiteral("u.name IN (SELECT DISTINCT s.user_name FROM {prefix}_sessions s WHERE "
+                                         "s.ip_address IN ") +
+                              altInClause(QStringLiteral(":alt_ip"), ipList) +
+                              QStringLiteral(" AND s.start_time >= DATE_SUB(NOW(), INTERVAL 6 MONTH))");
+        }
+        if (!clientIdList.isEmpty()) {
+            conditions << QStringLiteral("u.name IN (SELECT DISTINCT s.user_name FROM {prefix}_sessions s WHERE "
+                                         "s.clientid IN ") +
+                              altInClause(QStringLiteral(":alt_hcid"), clientIdList) +
+                              QStringLiteral(" AND s.start_time >= DATE_SUB(NOW(), INTERVAL 6 MONTH))");
+        }
+        candidateString += conditions.join(QStringLiteral(" OR "));
+        candidateString += QStringLiteral(" ORDER BY u.name LIMIT ") + QString::number(MAX_USER_ALTS_PER_LEVEL);
+
+        QSqlQuery *candidateQuery = prepareQuery(candidateString);
+        altBindValues(candidateQuery, QStringLiteral(":alt_email"), emailList);
+        altBindValues(candidateQuery, QStringLiteral(":alt_cid"), clientIdList);
+        altBindValues(candidateQuery, QStringLiteral(":alt_ip"), ipList);
+        altBindValues(candidateQuery, QStringLiteral(":alt_hcid"), clientIdList);
+        if (!execSqlQuery(candidateQuery)) {
+            qCWarning(DatabaseInterfaceLog) << "Failed to collect user alt information: SQL Error";
+            return results;
+        }
+
+        QList<AltCandidate> candidates;
+        while (candidateQuery->next()) {
+            AltCandidate candidate;
+            candidate.name = candidateQuery->value(0).toString();
+            if (visited.contains(candidate.name)) {
+                continue;
+            }
+            candidate.email = candidateQuery->value(1).toString();
+            candidate.clientId = candidateQuery->value(2).toString();
+            candidate.registrationTime = candidateQuery->value(3).toLongLong();
+            candidate.hasLastLogin = !candidateQuery->value(4).isNull();
+            candidate.lastLogin = candidateQuery->value(4).toLongLong();
+            candidate.warnCount = candidateQuery->value(5).toInt();
+            candidate.banCount = candidateQuery->value(6).toInt();
+            candidate.isActive = candidateQuery->value(7).toBool();
+            candidates << candidate;
+        }
+
+        // Resolve session-level evidence (shared IP or historic client id) for
+        // candidates that do not match on current email or client id.
+        QMap<QString, QString> candidateIp;
+        QMap<QString, QString> candidateHistoricClientId;
+        QList<QString> unexplained;
+        for (const AltCandidate &candidate : candidates) {
+            const bool emailMatch = !candidate.email.isEmpty() && emails.contains(candidate.email);
+            const bool clientIdMatch = !candidate.clientId.isEmpty() && clientIds.contains(candidate.clientId);
+            if (!emailMatch && !clientIdMatch) {
+                unexplained << candidate.name;
+            }
+        }
+        if (!unexplained.isEmpty() && (!ips.isEmpty() || !clientIds.isEmpty())) {
+            QString evidenceString =
+                QStringLiteral("SELECT DISTINCT user_name, ip_address, clientid FROM {prefix}_sessions WHERE "
+                               "user_name IN ") +
+                altInClause(QStringLiteral(":alt_ev"), unexplained) + QStringLiteral(" AND (");
+            QStringList evidenceConditions;
+            if (!ipList.isEmpty()) {
+                evidenceConditions << QStringLiteral("ip_address IN ") +
+                                          altInClause(QStringLiteral(":alt_eip"), ipList);
+            }
+            if (!clientIdList.isEmpty()) {
+                evidenceConditions << QStringLiteral("clientid IN ") +
+                                          altInClause(QStringLiteral(":alt_ecid"), clientIdList);
+            }
+            evidenceString += evidenceConditions.join(QStringLiteral(" OR "));
+            evidenceString += QStringLiteral(") AND start_time >= DATE_SUB(NOW(), INTERVAL 6 MONTH)");
+
+            QSqlQuery *evidenceQuery = prepareQuery(evidenceString);
+            altBindValues(evidenceQuery, QStringLiteral(":alt_ev"), unexplained);
+            altBindValues(evidenceQuery, QStringLiteral(":alt_eip"), ipList);
+            altBindValues(evidenceQuery, QStringLiteral(":alt_ecid"), clientIdList);
+            if (execSqlQuery(evidenceQuery)) {
+                while (evidenceQuery->next()) {
+                    const QString name = evidenceQuery->value(0).toString();
+                    const QString ip = evidenceQuery->value(1).toString();
+                    const QString clientId = evidenceQuery->value(2).toString();
+                    if (!ip.isEmpty() && ips.contains(ip) && !candidateIp.contains(name)) {
+                        candidateIp.insert(name, ip);
+                    }
+                    if (!clientId.isEmpty() && clientIds.contains(clientId) &&
+                        !candidateHistoricClientId.contains(name)) {
+                        candidateHistoricClientId.insert(name, clientId);
+                    }
+                }
+            }
+        }
+
+        // Fan-out counts so moderators can spot VPN/shared-network false positives.
+        QMap<QString, int> emailCounts;
+        QMap<QString, int> clientIdCounts;
+        QMap<QString, int> ipCounts;
+        QSet<QString> neededEmails;
+        QSet<QString> neededClientIds;
+        QSet<QString> neededIps;
+        for (const AltCandidate &candidate : candidates) {
+            if (!candidate.email.isEmpty() && emails.contains(candidate.email)) {
+                neededEmails << candidate.email;
+            } else if (!candidate.clientId.isEmpty() && clientIds.contains(candidate.clientId)) {
+                neededClientIds << candidate.clientId;
+            } else if (candidateHistoricClientId.contains(candidate.name)) {
+                neededClientIds << candidateHistoricClientId.value(candidate.name);
+            } else if (candidateIp.contains(candidate.name)) {
+                neededIps << candidateIp.value(candidate.name);
+            }
+        }
+        if (!neededEmails.isEmpty()) {
+            const QList<QString> neededEmailList = neededEmails.values();
+            QSqlQuery *countQuery = prepareQuery(QStringLiteral("SELECT email, COUNT(*) FROM {prefix}_users WHERE "
+                                                                "email IN ") +
+                                                 altInClause(QStringLiteral(":alt_ce"), neededEmailList) +
+                                                 QStringLiteral(" GROUP BY email"));
+            altBindValues(countQuery, QStringLiteral(":alt_ce"), neededEmailList);
+            if (execSqlQuery(countQuery)) {
+                while (countQuery->next()) {
+                    emailCounts.insert(countQuery->value(0).toString(), countQuery->value(1).toInt());
+                }
+            }
+        }
+        if (!neededClientIds.isEmpty()) {
+            const QList<QString> neededClientIdList = neededClientIds.values();
+            QSqlQuery *countQuery = prepareQuery(QStringLiteral("SELECT clientid, COUNT(*) FROM {prefix}_users WHERE "
+                                                                "clientid IN ") +
+                                                 altInClause(QStringLiteral(":alt_cc"), neededClientIdList) +
+                                                 QStringLiteral(" GROUP BY clientid"));
+            altBindValues(countQuery, QStringLiteral(":alt_cc"), neededClientIdList);
+            if (execSqlQuery(countQuery)) {
+                while (countQuery->next()) {
+                    clientIdCounts.insert(countQuery->value(0).toString(), countQuery->value(1).toInt());
+                }
+            }
+        }
+        if (!neededIps.isEmpty()) {
+            const QList<QString> neededIpList = neededIps.values();
+            QSqlQuery *countQuery = prepareQuery(
+                QStringLiteral("SELECT ip_address, COUNT(DISTINCT user_name) FROM {prefix}_sessions WHERE "
+                               "ip_address IN ") +
+                altInClause(QStringLiteral(":alt_ci"), neededIpList) +
+                QStringLiteral(" AND start_time >= DATE_SUB(NOW(), INTERVAL 6 MONTH) GROUP BY ip_address"));
+            altBindValues(countQuery, QStringLiteral(":alt_ci"), neededIpList);
+            if (execSqlQuery(countQuery)) {
+                while (countQuery->next()) {
+                    ipCounts.insert(countQuery->value(0).toString(), countQuery->value(1).toInt());
+                }
+            }
+        }
+
+        QList<QString> nextFrontier;
+        for (const AltCandidate &candidate : candidates) {
+            QString matchReason;
+            int sharedCount = 1;
+            if (!candidate.email.isEmpty() && emails.contains(candidate.email)) {
+                matchReason = QStringLiteral("email");
+                sharedCount = qMax(1, emailCounts.value(candidate.email, 1));
+            } else if (!candidate.clientId.isEmpty() && clientIds.contains(candidate.clientId)) {
+                matchReason = QStringLiteral("clientid:") + candidate.clientId;
+                sharedCount = qMax(1, clientIdCounts.value(candidate.clientId, 1));
+            } else if (candidateHistoricClientId.contains(candidate.name)) {
+                const QString historicId = candidateHistoricClientId.value(candidate.name);
+                matchReason = QStringLiteral("clientid:") + historicId;
+                sharedCount = qMax(1, clientIdCounts.value(historicId, 1));
+            } else if (candidateIp.contains(candidate.name)) {
+                const QString ip = candidateIp.value(candidate.name);
+                matchReason = QStringLiteral("ip:") + ip;
+                sharedCount = qMax(1, ipCounts.value(ip, 1));
+            } else {
+                continue;
+            }
+            appendAlt(candidate, matchReason, level, sharedCount);
+            visited.insert(candidate.name);
+            nextFrontier << candidate.name;
+        }
+        frontier = nextFrontier;
     }
 
     return results;

servatrice/src/servatrice_database_interface.h

@@ -200,7 +200,7 @@ public:
                                                        int &range,
                                                        int &maxresults);
     QList<ServerInfo_UserSession> getUserSessions(const QString &userName, int limit);
-    QList<ServerInfo_UserAlt> getUserAlts(const QString &userName);
+    QList<ServerInfo_UserAlt> getUserAlts(const QString &userName, int depth = 1);
     QList<ServerInfo_ModeratorLogin> getModeratorLastLogins();
 
     // Uptime snapshot as recorded by Servatrice::statusUpdate() into the

servatrice/src/serversocketinterface.cpp

@@ -2565,7 +2565,8 @@ Response::ResponseCode AbstractServerSocketInterface::cmdGetUserAlts(const Comma
     }
 
     Response_UserAlts *re = new Response_UserAlts;
-    const QList<ServerInfo_UserAlt> alts = sqlInterface->getUserAlts(userName);
+    const int depth = cmd.has_depth() ? static_cast<int>(cmd.depth()) : 1;
+    const QList<ServerInfo_UserAlt> alts = sqlInterface->getUserAlts(userName, depth);
     for (const ServerInfo_UserAlt &alt : alts) {
         re->add_alts()->CopyFrom(alt);
     }