[Client] Extract at-risk data warning out of MainWindow

cockatrice/src/interface/at_risk_data_warning.h

@@ -0,0 +1,55 @@
+#ifndef AT_RISK_DATA_WARNING_H
+#define AT_RISK_DATA_WARNING_H
+
+#include <QObject>
+#include <QString>
+#include <QStringList>
+#include <QtGlobal>
+
+class QWidget;
+
+/**
+ * @brief Warns when user data lives inside the program directory and backs it up first.
+ *
+ * The uninstallers shipped in Cockatrice 3.1.0/3.1.1 delete the whole install
+ * tree, so data paths configured inside the program directory (and portable
+ * installs, whose data lives there by design) get a safety backup outside the
+ * install directory before the warning is shown.
+ */
+class AtRiskDataWarning : public QObject
+{
+    Q_OBJECT
+public:
+    struct AtRiskBackupOutcome
+    {
+        QStringList locations;         ///< backup targets created for this check
+        QString sessionDir;            ///< session directory holding the backup
+        bool complete = true;          ///< false when only a partial/fallback backup exists
+        bool reused = false;           ///< true when a recent session was reused instead of copying
+        bool skippedDueToSize = false; ///< true when the automatic copy was skipped for size
+        qint64 bytes = 0;              ///< estimated bytes, only set when a fresh copy was attempted
+    };
+    struct AtRiskPaths
+    {
+        QStringList sourcesToBackUp;     ///< existing paths that need a safety copy
+        QStringList offendersForDisplay; ///< paths listed in the warning (empty for portable)
+    };
+
+    /**
+     * @brief Backs up at-risk data paths and warns about them.
+     * @param parent Parent widget for the warning dialog
+     */
+    static void warnAboutDataPathsInProgramDir(QWidget *parent);
+
+private:
+    static AtRiskPaths collectPortableAtRiskPaths(const QString &appDir);
+    static QStringList collectInstalledAtRiskPaths(const QString &appDir);
+    static AtRiskBackupOutcome backUpAtRiskPaths(const QStringList &sources, const QString &appDir);
+    static QString buildPortableAtRiskMessage(const AtRiskBackupOutcome &outcome, bool emptySources);
+    static QString buildInstalledAtRiskMessage(const QStringList &offenders,
+                                               const QStringList &sources,
+                                               const AtRiskBackupOutcome &outcome);
+    static void showAtRiskDataWarning(QWidget *parent, const QString &title, const QString &message);
+};
+
+#endif // AT_RISK_DATA_WARNING_H