#version 330

uniform float time;
uniform sampler2D ourTexture;
uniform int has_texture;

out vec4 FragColor;
flat in int vID;
in vec2 texCoord;
in vec3 position;
in vec3 normal;


float rand(float n)
{
	return fract(sin(n) * 43758.5453123);
}

void main()
{
	vec3 color = vec3(rand(float(vID + int(time))), rand(float(vID + int(time))), rand(float(vID + int(time))));
	vec3 n = normalize(vec3(10. * cos(time), 10., 10. * sin(time)) - position);
	float phong = 0.2 + 0.8 * max(0., dot(n, normalize(normal)));
	float specular = pow(max(dot(reflect(n, normalize(normal)), normalize(vec3(0, 0, -2) - position)), 0.), 10.);
	if (has_texture == 1) {
    	FragColor = vec4(texture(ourTexture, texCoord).rgb * phong + vec3(1.) * specular, 1.);
    	//FragColor = vec4(texCoord.xyx / 2. * phong + vec3(1.) * specular, 1.);
	}
    else {
		FragColor = vec4(color, 1.);
    }
	//FragColor = vec4(color * 0.001 + normal, 1.);
}