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#ifndef Frustum_INCLUDE_ONCE
#define Frustum_INCLUDE_ONCE

#include <vlCore/Plane.hpp>
#include <vlCore/AABB.hpp>
#include <vlCore/Sphere.hpp>

namespace vl
{
  //-----------------------------------------------------------------------------
  // Frustum
  //-----------------------------------------------------------------------------
  /**
   * A set of planes defining a frustum used for culling purposes (frustum culling).
   *
   * \sa Camera, Viewport
  */
  class Frustum: public Object
  {
    VL_INSTRUMENT_CLASS(vl::Frustum, Object)

  public:
    std::vector<Plane>& planes() { return mPlanes; }
    const std::vector<Plane>& planes() const { return mPlanes; }

    void setPlane(unsigned i, const Plane& plane) { VL_CHECK(i<mPlanes.size()); mPlanes[i] = plane; }
    const Plane& plane(unsigned i) const { VL_CHECK(i<mPlanes.size()); return mPlanes[i]; }

    bool cull(const Sphere& sphere) const
    {
      // null spheres are always visible
      if (sphere.isNull())
        return false;
      for(unsigned i=0; i<planes().size(); ++i)
      {
        if ( plane(i).distance(sphere.center()) > sphere.radius() )
          return true;
      }
      return false;
    }

    bool cull(const AABB& aabb) const
    {
      if (aabb.isNull())
        return false;
      for(unsigned i=0; i<planes().size(); ++i)
      {
        if ( plane(i).isOutside(aabb) )
          return true;
      }
      return false;
    }

    bool cull(const std::vector<fvec3>& points) const
    {
      for(unsigned i=0; i<planes().size(); ++i)
      {
        unsigned j=0;
        for(; j<points.size(); ++j)
          if ( plane(i).distance((vec3)points[j]) <= 0 )
            break;
        if(j == points.size())
          return true;
      }
      return false;
    }

  protected:
    std::vector<Plane> mPlanes;
  };
}

#endif