in vec3 vNormal;
in vec2 vTexCoords;
in vec4 vColour;
in vec3 vPosition;
in float depth_space;

struct Light
{
    vec4 position;
    vec4 ambient;
    vec4 diffuse;
    vec4 specular;
};

void main() {
    vec4 light_colour = vec4(0.0, 0.0, 0.0, 1.0);

    Light lightPoint = Light(
            vec4(256.0, 256.0, 5.0, 1.0),
            vec4(0.5,   0.5,   0.5, 1.0),
            vec4(1.0,   1.0,   1.0, 1.0),
            vec4(1.0,   1.0,   1.0, 1.0));

    vec3 N = normalize(vNormal);
    vec3 E = normalize(-vPosition);
    vec3 L = normalize(lightPoint.position.xyz - vPosition);
    vec3 R = reflect(-L, N);
    float lambertTerm = dot(N,L);


    // This errors
    //vec4 diffuseTerm = lightPoint.diffuse * vec4(lambertTerm, lambertTerm, lambertTerm, 1.0);

    // This DOES NOT error
    vec4 diffuseTerm = lightPoint.diffuse;


    light_colour += diffuseTerm;
    //float specular = pow( max(dot(R, E), 0.0), 1 );
    //light_colour += lightPoint.specular * specular;

    vec4 textureSample = texture(sampler, vTexCoords);
    if(textureSample.a <= 0){
        discard;
    }

    out_Colour = textureSample * vColour * light_colour;
}