[Client+Server] Deck version history with restore

cockatrice/src/interface/widgets/dialogs/dlg_deck_history.h

@@ -0,0 +1,73 @@
+/**
+ * @file dlg_deck_history.h
+ * @brief Browser for the stored versions of one server deck.
+ */
+
+#ifndef DLG_DECK_HISTORY_H
+#define DLG_DECK_HISTORY_H
+
+#include <QDialog>
+#include <QList>
+#include <QString>
+
+class AbstractClient;
+class CommandContainer;
+class QLabel;
+class QListWidget;
+class QPushButton;
+class Response;
+
+/** @brief One stored deck version for display. */
+struct DeckHistoryVersion
+{
+    unsigned int versionNo = 0;
+    qint64 createdAtSecs = 0;
+    QString createdByClientId;
+    QString hash;
+    QString content;
+};
+
+/**
+ * @class DlgDeckHistory
+ * @brief Lists stored versions with a diff preview against the current deck.
+ *
+ * Restoring uploads the selected version as the new current content through
+ * the regular deck-upload path, so it becomes a version itself instead of
+ * rewriting history. Rejected dialogs restore nothing.
+ */
+class DlgDeckHistory : public QDialog
+{
+    Q_OBJECT
+public:
+    DlgDeckHistory(int deckId, const QString &deckName, int limit, AbstractClient *client, QWidget *parent = nullptr);
+    void retranslateUi();
+
+signals:
+    void restoreRequested(int deckId, const QString &content);
+
+private slots:
+    void onHistoryFinished(const Response &response, const CommandContainer &commandContainer);
+    void onCurrentFinished(const Response &response, const CommandContainer &commandContainer);
+    void onSelectionChanged();
+    void onRestoreClicked();
+
+private:
+    void renderVersions();
+    void renderPreview();
+
+    int deckId = -1;
+    QString deckName;
+    int limit = 20;
+    AbstractClient *client = nullptr;
+    QList<DeckHistoryVersion> versions;
+    QString currentContent;
+    bool historyArrived = false;
+    bool currentArrived = false;
+
+    QLabel *detailLabel;
+    QListWidget *versionsList;
+    QListWidget *previewList;
+    QPushButton *restoreButton;
+};
+
+#endif // DLG_DECK_HISTORY_H