Core: Add TimePlayed class to track game playtime

Creates TimePlayed class and implemented constructors, AddTime, GetTimePlayed, and Reload methods. Updates CMakeLists.txt and DolphinLib.props as appropriate.

Source/Core/Core/CMakeLists.txt

@@ -539,6 +539,8 @@ add_library(core
   SysConf.h
   System.cpp
   System.h
+  TimePlayed.cpp
+  TimePlayed.h
   TitleDatabase.cpp
   TitleDatabase.h
   WC24PatchEngine.cpp

Source/Core/Core/TimePlayed.cpp

@@ -0,0 +1,66 @@
+// Copyright 2025 Dolphin Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "Core/TimePlayed.h"
+
+#include <chrono>
+#include <string>
+
+#include "Common/CommonTypes.h"
+#include "Common/FileUtil.h"
+#include "Common/IniFile.h"
+#include "Common/NandPaths.h"
+
+TimePlayed::TimePlayed()
+    : m_game_id(""), m_ini_path(File::GetUserPath(D_CONFIG_IDX) + "TimePlayed.ini")
+{
+  Reload();
+}
+
+TimePlayed::TimePlayed(std::string game_id)
+    : m_game_id(Common::EscapeFileName(game_id)),  // filter for unsafe characters
+      m_ini_path(File::GetUserPath(D_CONFIG_IDX) + "TimePlayed.ini")
+{
+  Reload();
+}
+
+TimePlayed::~TimePlayed() = default;
+
+void TimePlayed::AddTime(std::chrono::milliseconds time_emulated)
+{
+  if (m_game_id == "")
+  {
+    return;
+  }
+
+  u64 previous_time;
+  m_time_list->Get(m_game_id, &previous_time);
+  m_time_list->Set(m_game_id, previous_time + static_cast<u64>(time_emulated.count()));
+  m_ini.Save(m_ini_path);
+}
+
+std::chrono::milliseconds TimePlayed::GetTimePlayed() const
+{
+  if (m_game_id == "")
+  {
+    return std::chrono::milliseconds(0);
+  }
+
+  u64 previous_time;
+  m_time_list->Get(m_game_id, &previous_time);
+  return std::chrono::milliseconds(previous_time);
+}
+
+std::chrono::milliseconds TimePlayed::GetTimePlayed(std::string game_id) const
+{
+  std::string filtered_game_id = Common::EscapeFileName(game_id);
+  u64 previous_time;
+  m_time_list->Get(filtered_game_id, &previous_time);
+  return std::chrono::milliseconds(previous_time);
+}
+
+void TimePlayed::Reload()
+{
+  m_ini.Load(m_ini_path);
+  m_time_list = m_ini.GetOrCreateSection("TimePlayed");
+}

Source/Core/Core/TimePlayed.h

@@ -0,0 +1,40 @@
+// Copyright 2025 Dolphin Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include <chrono>
+#include <string>
+
+#include "Common/CommonTypes.h"
+#include "Common/IniFile.h"
+
+class TimePlayed
+{
+public:
+  // used for QT interface - general access to time played for games
+  TimePlayed();
+
+  TimePlayed(std::string game_id);
+
+  // not copyable due to the stored section pointer
+  TimePlayed(const TimePlayed& other) = delete;
+  TimePlayed(TimePlayed&& other) = delete;
+  TimePlayed& operator=(const TimePlayed& other) = delete;
+  TimePlayed& operator=(TimePlayed&& other) = delete;
+
+  ~TimePlayed();
+
+  void AddTime(std::chrono::milliseconds time_emulated);
+
+  std::chrono::milliseconds GetTimePlayed() const;
+  std::chrono::milliseconds GetTimePlayed(std::string game_id) const;
+
+  void Reload();
+
+private:
+  std::string m_game_id;
+  std::string m_ini_path;
+  Common::IniFile m_ini;
+  Common::IniFile::Section* m_time_list;
+};

Source/Core/DolphinLib.props

@@ -459,6 +459,7 @@
     <ClInclude Include="Core\SyncIdentifier.h" />
     <ClInclude Include="Core\SysConf.h" />
     <ClInclude Include="Core\System.h" />
+    <ClInclude Include="Core\TimePlayed.h" />
     <ClInclude Include="Core\TitleDatabase.h" />
     <ClInclude Include="Core\WC24PatchEngine.h" />
     <ClInclude Include="Core\WiiRoot.h" />
@@ -1125,6 +1126,7 @@
     <ClCompile Include="Core\State.cpp" />
     <ClCompile Include="Core\SysConf.cpp" />
     <ClCompile Include="Core\System.cpp" />
+    <ClCompile Include="Core\TimePlayed.cpp" />
     <ClCompile Include="Core\TitleDatabase.cpp" />
     <ClCompile Include="Core\WiiRoot.cpp" />
     <ClCompile Include="Core\WiiUtils.cpp" />