#version 330 core
struct Material {
  vec3 ambient;
  vec3 diffuse;
  vec3 specular;
  float shininess;
};


struct Light {
    vec3 position;
    vec3 ambient;
    vec3 diffuse;
    vec3 specular;
};


out vec4 FragColor;

in vec3 FragPos;
in vec3 Normal;

uniform vec3 ourColor;
uniform vec3 viewPos;
uniform Material material;
uniform Light light;

void main()
{
  //misc
  vec3 norm = normalize(Normal);
  vec3 lightDir = normalize(light.position - FragPos);

  // ambient
  vec3 ambient = light.ambient * material.ambient;

  // diffuse
  float diff = max(dot(norm, lightDir), 0.0);
  vec3 diffuse = light.diffuse * (diff * material.diffuse);

  // specular
  vec3 viewDir = normalize(viewPos - FragPos);
  vec3 reflectDir = reflect(-lightDir, norm);
  float spec = pow(max(dot(viewDir, reflectDir), 0.0), material.shininess);
  vec3 specular = light.specular * (spec * material.specular);

  //out
  vec3 result = ambient + diffuse + specular;
  FragColor = vec4(result, 1.0);
}