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#ifndef __RAY_H__
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#define __RAY_H__
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#include "../CGLA/Vec3i.h"
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#include "../CGLA/Vec3f.h"
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#include "TriMesh.h"
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namespace Geometry
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{
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  const double d_eps = 0.000001;
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  const float f_eps = 0.01f;
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  struct Ray
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  {
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    // Constructor
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    Ray()
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      : origin(0.0f), direction(0.0f), hit_pos(0.0f), hit_normal(0.0f),
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        has_hit(false), dist(CGLA::BIG), ior(1.0f), u(0.0f), v(0.0f),
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	hit_object(0)
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    { }
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    Ray(const CGLA::Vec3f& _origin, const CGLA::Vec3f& _direction)
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      : origin(_origin), direction(_direction), hit_pos(0.0f), hit_normal(0.0f),
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        has_hit(false), dist(CGLA::BIG), ior(1.0f), u(0.0f), v(0.0f),
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	hit_object(0)
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    { }
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    CGLA::Vec3f origin;
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    CGLA::Vec3f direction;
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    CGLA::Vec3f hit_pos;
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    CGLA::Vec3f hit_normal;
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    bool has_hit; // Did the ray hit an object
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    double dist;  // Distance from origin to current intersection
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    float ior;    // Current index of refraction for media
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    float u, v;   // uv-coordinates on current surface
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    float ran;
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    int trace_depth;  // Current recursion number
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    size_t hit_face_id;
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    int id;
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    Geometry::TriMesh* hit_object;
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    void reset()
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    {
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      dist = CGLA::BIG;
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      hit_object = 0;
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      u=0.0f;
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      v=0.0f;
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      has_hit=false;
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    }
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    void compute_position()
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    {
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      hit_pos = origin + dist*direction;
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    }
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    void compute_normal()
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    {
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      CGLA::Vec3i face = hit_object->normals.face(hit_face_id);
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      CGLA::Vec3f normal0 = hit_object->normals.vertex(face[0]);
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      CGLA::Vec3f normal1 = hit_object->normals.vertex(face[1]);
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      CGLA::Vec3f normal2 = hit_object->normals.vertex(face[2]);
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      hit_normal = normalize(normal0*(1 - u - v) + normal1*u + normal2*v);
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    }
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    void reflect(const CGLA::Vec3f &normal)
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    {
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      assert(dot(direction, normal) < 0.0f);
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      direction = normal*2.0f*dot(-direction,normal) + direction;
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    }
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    void refract(const CGLA::Vec3f& normal, float new_ior)
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    {
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      float ref_ratio = ior/new_ior;
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      float cos_N_I = dot(normal, direction);
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      CGLA::Vec3f norm(normal);
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      if(cos_N_I > 0.0f)
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      {
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	norm = -norm;
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	cos_N_I = dot(norm, direction);
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      }
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      float selector = 1 + (ref_ratio*ref_ratio)*(cos_N_I*cos_N_I - 1);
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      if(selector > 0.0f)
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      {
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	direction = norm*(ref_ratio*(-cos_N_I) - sqrt(selector))
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	            + direction*ref_ratio;
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	ior = new_ior;
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      }
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      else
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	// Total internal reflection.
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	reflect(normal);
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    }
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    bool cond_set_parameter(float t, float _u, float _v,
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			    Geometry::TriMesh* mesh, size_t idx)
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    {
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      if(t < dist)
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      {
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	dist = t;
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	u = _u;
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	v = _v;
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	hit_object = mesh;
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	hit_face_id = idx;
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	has_hit = true;
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      }
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    }
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  };
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}
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#endif
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