#version 330 core
in vec3 vNormal;
in vec3 vWorldPos;

uniform vec3 uBaseColor;
uniform vec3 uLightDir;
uniform vec3 uViewPos;

out vec4 fragColor;

void main() {
    vec3 normal = normalize(vNormal);
    vec3 lightDir = normalize(-uLightDir);

    float diffuse = max(dot(normal, lightDir), 0.0);
    float ambient = 0.12;

    vec3 viewDir = normalize(uViewPos - vWorldPos);
    vec3 halfway = normalize(lightDir + viewDir);
    float specular = pow(max(dot(normal, halfway), 0.0), 32.0) * 0.3;

    vec3 color = uBaseColor * (ambient + diffuse) + vec3(specular);
    fragColor = vec4(color, 1.0);
}