#pragma once

#include "StarRect.hpp"
#include "StarNetElementSystem.hpp"
#include "StarGameTypes.hpp"

namespace Star {

STAR_CLASS(WorldClientState);

// Class to aid in network syncronization of client state such as viewing area
// and player entity id.
class WorldClientState {
public:
  WorldClientState();

  // Actual area of the client visible screen (rounded to nearest block)
  RectI window() const;
  void setWindow(RectI const& window);

  // Shortcut to find the window center of the client.
  Vec2F windowCenter() const;

  // Entity of the unique main Player for this client
  EntityId playerId() const;
  void setPlayer(EntityId playerId);

  // Entities that should contribute to the monitoring regions of the client.
  List<EntityId> const& clientPresenceEntities() const;
  void setClientPresenceEntities(List<EntityId> entities);

  // All areas of the server monitored by the client, takes a function to
  // resolve an entity id to its bound box.
  List<RectI> monitoringRegions(function<Maybe<RectI>(EntityId)> entityBounds) const;

  ByteArray writeDelta();
  void readDelta(ByteArray delta);

  // Whether the client is connected to a legacy server.
  void setLegacy(bool legacy);
  bool legacy() const;

  void reset();

private:
  int m_windowMonitoringBorder;
  int m_presenceEntityMonitoringBorder;

  NetElementTopGroup m_netGroup;
  uint64_t m_netVersion;

  NetElementInt m_windowXMin;
  NetElementInt m_windowYMin;
  NetElementInt m_windowWidth;
  NetElementInt m_windowHeight;

  NetElementInt m_playerId;
  NetElementData<List<EntityId>> m_clientPresenceEntities;

  bool m_legacy;
};

}