Repo created

libs/routing/base/astar_progress.hpp

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+#pragma once
+
+#include "geometry/latlon.hpp"
+
+#include <list>
+
+namespace routing
+{
+class AStarSubProgress
+{
+public:
+  AStarSubProgress(ms::LatLon const & start, ms::LatLon const & finish, double contributionCoef);
+
+  explicit AStarSubProgress(double contributionCoef);
+
+  double UpdateProgress(ms::LatLon const & current, ms::LatLon const & finish);
+  /// \brief Some |AStarSubProgress| could have their own subProgresses (next item in
+  /// AStarProgress::m_subProgresses after current), in order to return true progress
+  /// back to the upper level of subProgresses, we should do progress backpropagation of
+  /// subProgress of current subProgress - |subSubProgressValue|
+  double UpdateProgress(double subSubProgressValue);
+
+  void Flush(double progress);
+  double GetMaxContribution() const;
+
+private:
+  static double CalcDistance(ms::LatLon const & from, ms::LatLon const & to);
+
+  double m_currentProgress = 0.0;
+  double m_contributionCoef = 0.0;
+  double m_fullDistance = 0.0;
+  double m_forwardDistance = 0.0;
+  double m_backwardDistance = 0.0;
+
+  ms::LatLon m_startPoint;
+  ms::LatLon m_finishPoint;
+};
+
+class AStarProgress
+{
+public:
+  static double const kMaxPercent;
+
+  AStarProgress();
+  ~AStarProgress();
+
+  double GetLastPercent() const;
+  void PushAndDropLastSubProgress();
+  void DropLastSubProgress();
+  void AppendSubProgress(AStarSubProgress const & subProgress);
+  double UpdateProgress(ms::LatLon const & current, ms::LatLon const & end);
+
+private:
+  using ListItem = std::list<AStarSubProgress>::iterator;
+
+  double UpdateProgressImpl(ListItem subProgress, ms::LatLon const & current, ms::LatLon const & end);
+
+  // This value is in range: [0, 1].
+  double m_lastPercentValue = 0.0;
+
+  std::list<AStarSubProgress> m_subProgresses;
+};
+}  //  namespace routing