#version 330

struct Material {
	vec3 ambient;
	vec3 diffuse;
	vec3 specular;
	float shininess;
	bool hasTexture;
};

in vec3 normal;
in vec3 fragPos;
in vec2 texCoord;

uniform vec3 lightPos;
uniform vec3 viewPos;
uniform vec4 lightColor;

uniform Material material;
uniform sampler2D tex;

out vec4 FragColor;

void main() {
	vec3 lightDir = normalize(fragPos - lightPos);
	vec3 diffuse = max(0, dot(-normal, lightDir)) * material.diffuse;

	vec3 viewDir = normalize(fragPos - viewPos);
	vec3 reflectDir = reflect(-lightDir, normal);
	vec3 specular = pow(max(0, dot(viewDir, reflectDir)), material.shininess) * material.specular;

	vec4 lighting = vec4(material.ambient + diffuse + specular, 1) * lightColor;

	if (material.hasTexture)
		FragColor = lighting * texture(tex, texCoord);
	else
		FragColor = lighting;
}