//
//  KRViewport.h
//  Kraken Engine
//
//  Copyright 2026 Kearwood Gilbert. All rights reserved.
//  
//  Redistribution and use in source and binary forms, with or without modification, are
//  permitted provided that the following conditions are met:
//  
//  1. Redistributions of source code must retain the above copyright notice, this list of
//  conditions and the following disclaimer.
//  
//  2. Redistributions in binary form must reproduce the above copyright notice, this list
//  of conditions and the following disclaimer in the documentation and/or other materials
//  provided with the distribution.
//  
//  THIS SOFTWARE IS PROVIDED BY KEARWOOD GILBERT ''AS IS'' AND ANY EXPRESS OR IMPLIED
//  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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//

#pragma once

#include "KREngine-common.h"

#include "aabb.h"

#include "KRShaderReflection.h"

class KRLight;

class KRViewport
  : public KRReflectedObject
{
public:
  KRViewport();
  KRViewport(const hydra::Vector2& size, const hydra::Matrix4& matView, const hydra::Matrix4& matProjection);
  ~KRViewport();

  bool getShaderValue(const KRCamera* camera, ShaderValue value, hydra::Vector4* output) const final;
  bool getShaderValue(const KRCamera* camera, ShaderValue value, hydra::Matrix4* output) const final;

  const hydra::Vector2& getSize() const;
  const hydra::Matrix4& getViewMatrix() const;
  const hydra::Matrix4& getProjectionMatrix() const;
  const hydra::Matrix4& getViewProjectionMatrix() const;
  const hydra::Matrix4& getInverseViewMatrix() const;
  const hydra::Matrix4& getInverseProjectionMatrix() const;
  const hydra::Vector3& getCameraDirection() const;
  const hydra::Vector3& getCameraPosition() const;
  const int* getFrontToBackOrder() const;
  const int* getBackToFrontOrder() const;
  void setSize(const hydra::Vector2& size);
  void setViewMatrix(const hydra::Matrix4& matView);
  void setProjectionMatrix(const hydra::Matrix4& matProjection);
  float getLODBias() const;
  void setLODBias(float lod_bias);

  // Overload assignment operator
  KRViewport& operator=(const KRViewport& v);

  const std::set<KRLight*>& getVisibleLights();
  void setVisibleLights(const std::set<KRLight*> visibleLights);

  bool visible(const hydra::AABB& b) const;
  float coverage(const hydra::AABB& b) const;

private:
  hydra::Vector2 m_size;
  hydra::Matrix4 m_matView;
  hydra::Matrix4 m_matProjection;

  float m_lodBias;

  // Derived values
  hydra::Matrix4 m_matViewProjection;
  hydra::Matrix4 m_matInverseView;
  hydra::Matrix4 m_matInverseProjection;
  hydra::Vector3 m_cameraDirection;
  hydra::Vector3 m_cameraPosition;

  int m_frontToBackOrder[8];
  int m_backToFrontOrder[8];

  void calculateDerivedValues();
};
