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+#ifndef UPDATER_H_809E7381
+#define UPDATER_H_809E7381
+
+#include <filesystem>
+#include <set>
+#include <string>
+
+#include <wx/wxprec.h>
+
+#ifndef WX_PRECOMP
+#include <wx/wx.h>
+#endif
+
+class wxWebRequest;
+class wxWebRequestEvent;
+
+class Updater : public wxEvtHandler {
+ public:
+  explicit Updater(wxFrame* parent);
+
+  void Cleanup();
+
+  void CheckForUpdates(bool invisible);
+
+ private:
+  enum class UpdateState {
+    GetVersionInvisible,
+    GetVersionManual,
+    GetPackage,
+  };
+
+  void OnWebRequestState(wxWebRequestEvent& event);
+
+  void ProcessVersionFile(std::string data);
+
+  void InstallUpdate(std::string url, std::string checksum,
+                     std::vector<std::filesystem::path> files,
+                     std::vector<std::filesystem::path> deletedFiles);
+
+  bool DownloadWithProgress(wxWebRequest& request);
+
+  wxFrame* parent_;
+  UpdateState update_state_ = UpdateState::GetVersionInvisible;
+  std::string package_path_;
+};
+
+#endif /* end of include guard: UPDATER_H_809E7381 */