#version 330 core
out vec4 FragColor;

in vec3 FragPos;
in vec3 Normal;

uniform vec3 ourColor;
uniform vec3 lightColor;
uniform vec3 lightPos;
uniform vec3 viewPos;

void main()
{
  float ambientStrength = 0.15;
  float specularStrength = 0.5;

  //msc
  vec3 norm = normalize(Normal);
  vec3 lightDir = normalize(lightPos - FragPos);

  // ambient
  vec3 ambient = ambientStrength * lightColor;

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

  // specular
  vec3 viewDir = normalize(viewPos - FragPos);
  vec3 reflectDir = reflect(-lightDir, norm);
  float spec = pow(max(dot(viewDir, reflectDir), 0.0), 150);
  vec3 specular = specularStrength * spec * lightColor;

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