Implement technology tree, research queue by least remaining work, and unit/building tech availability & obsolescence

gamemanager.h

@@ -14,6 +14,7 @@
 #include "terrain.h"
 #include "terrainyieldmanager.h"
 #include "actionneededmanager.h"
+#include "techconfig.h"
 
 enum class ActionMode {
     None,
@@ -48,13 +49,32 @@ public:
     void update(float deltaTime, Matrix2D<TerrainPoint> *mapPoints, int numPoints05);
 
     PlayerManager& players() { return m_playerManager; }
+    const PlayerManager& players() const { return m_playerManager; }
     UnitConfigManager& unitConfigs() { return m_unitConfigManager; }
+    const UnitConfigManager& unitConfigs() const { return m_unitConfigManager; }
     BuildingConfigManager& buildingConfigs() { return m_buildingConfigManager; }
     const BuildingConfigManager& buildingConfigs() const { return m_buildingConfigManager; }
     RoadConfigManager& roadConfigs() { return m_roadConfigManager; }
     const RoadConfigManager& roadConfigs() const { return m_roadConfigManager; }
     ActionNeededManager& actionNeededManager() { return m_actionNeededManager; }
     const ActionNeededManager& actionNeededManager() const { return m_actionNeededManager; }
+    TechTreeManager& techTree() { return m_techTreeManager; }
+    const TechTreeManager& techTree() const { return m_techTreeManager; }
+
+    // Tech Tree View & Research System
+    bool isTechTreeOpen() const { return m_isTechTreeOpen; }
+    void openTechTree();
+    void closeTechTree();
+    void toggleTechTree();
+
+    int calculatePlayerSciencePerTick(int playerId, Matrix2D<TerrainPoint> *mapPoints, int numPoints05) const;
+    int getTechRemainingScience(const Player &player, const QString &techId) const;
+    bool selectTechForPlayer(int playerId, const QString &targetTechId, bool appendToQueue = false);
+    void removeTechFromPlayerQueue(int playerId, const QString &techId);
+    void clearPlayerResearchQueue(int playerId);
+    void advancePlayerResearch(Player &player, int scienceGenerated);
+    QStringList getTechUnlocks(const QString &techId) const;
+    QStringList getTechObsoletes(const QString &techId) const;
 
     const std::vector<std::shared_ptr<Unit>>& getUnits() const { return m_units; }
     const std::vector<City>& getCities() const { return m_cities; }
@@ -149,6 +169,7 @@ private:
     BuildingConfigManager m_buildingConfigManager;
     RoadConfigManager m_roadConfigManager;
     ActionNeededManager m_actionNeededManager;
+    TechTreeManager m_techTreeManager;
     std::vector<std::shared_ptr<Unit>> m_units;
     std::vector<City> m_cities;
     std::vector<FloatingText> m_floatingTexts;
@@ -157,6 +178,7 @@ private:
 
     int m_selectedUnitId;
     int m_activeCityViewId;
+    bool m_isTechTreeOpen;
     ActionMode m_actionMode;
 
     float m_movementTickDuration; // Default 30.0s