#version 440

in vec3 f_color;
out vec4 FragColors;

struct Light {
  vec3 Position; 
  vec3 Color; 
};

uniform Light lights[64];
uniform int NLights;

in vec3 fNormal;
in vec3 pos;

in vec2 texCoord;
uniform sampler2D tex;

uniform vec3 view_pos;

void main()
{ 
	vec3 finalColor;
	vec3 diffuse_sum;
	vec3 specular_sum;
	vec3 ambient;
	
	vec4 texColor = texture(tex, texCoord);		
	//Hardcoded ambient
	ambient = texColor.rgb * 0.1;
	for (int i = 0; i < NLights; i++) 
	{   		
		vec3 L = normalize(lights[i].Position.xyz - pos);
		vec3 N = fNormal;
		vec3 V = normalize(view_pos - pos);
		vec3 H = normalize(V + L);

		vec3 diffuse = lights[i].Color * texColor.rgb * max(dot(L, N), 0.0);	
		vec3 specular = lights[i].Color * pow(max(dot(H, N), 0.0), 16.0) * 0.5;	
		diffuse_sum += diffuse;
		specular_sum += specular;
    }
	
	FragColors = (vec4(ambient + diffuse_sum + specular_sum, 1)); 	
}