Repo created

libs/drape_frontend/overlays_tracker.hpp

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+#pragma once
+
+#include "indexer/feature_decl.hpp"
+
+#include <chrono>
+#include <functional>
+#include <list>
+#include <map>
+#include <vector>
+
+namespace df
+{
+using EventClock = std::chrono::system_clock;
+using EventTimestamp = EventClock::time_point;
+
+struct OverlayShowEvent
+{
+  FeatureID m_feature;
+  uint8_t m_zoomLevel;
+  EventTimestamp m_timestamp;
+  bool m_hasMyPosition;
+  m2::PointD m_myPosition;
+  double m_gpsAccuracy;
+  OverlayShowEvent(FeatureID const & feature, uint8_t zoomLevel, EventTimestamp const & timestamp, bool hasMyPosition,
+                   m2::PointD const & myPosition, double gpsAccuracy)
+    : m_feature(feature)
+    , m_zoomLevel(zoomLevel)
+    , m_timestamp(timestamp)
+    , m_hasMyPosition(hasMyPosition)
+    , m_myPosition(myPosition)
+    , m_gpsAccuracy(gpsAccuracy)
+  {}
+};
+
+using OverlaysShowStatsCallback = std::function<void(std::list<OverlayShowEvent> &&)>;
+
+int constexpr kMinZoomLevel = 10;
+
+class OverlaysTracker
+{
+public:
+  OverlaysTracker() = default;
+
+  void SetTrackedOverlaysFeatures(std::vector<FeatureID> && ids);
+
+  bool StartTracking(int zoomLevel, bool hasMyPosition, m2::PointD const & myPosition, double gpsAccuracy);
+  void Track(FeatureID const & fid);
+  void FinishTracking();
+
+  std::list<OverlayShowEvent> Collect();
+
+  bool IsValid() const { return !m_data.empty(); }
+
+private:
+  enum class OverlayStatus
+  {
+    Invisible,
+    InvisibleCandidate,
+    Visible,
+  };
+
+  struct OverlayInfo
+  {
+    EventTimestamp m_timestamp;
+    OverlayStatus m_status = OverlayStatus::Invisible;
+    bool m_tracked = false;
+  };
+
+  std::map<FeatureID, OverlayInfo> m_data;
+  std::list<OverlayShowEvent> m_events;
+  int m_zoomLevel = -1;
+  bool m_hasMyPosition = false;
+  m2::PointD m_myPosition = m2::PointD::Zero();
+  double m_gpsAccuracy = 0.0;
+};
+}  // namespace df