#include <glm/ext/vector_float3.hpp>
#include <math.h>
#include "../lib/djstdlib/core.h"

real32 hue_to_rgb(real32 p, real32 q, real32 t) {
    if (t < 0) {
        t += 1;
    } else if (t > 1) {
        t -= 1;
    }
    if (t < 1.0f / 6) return p + (q - p) * 6 * t;
    if (t < 1.0f / 2) return q;
    if (t < 2.0f / 3) return p + (q - p) * (2.0f / 3 - t) * 6;
    return p;
};

glm::vec3 hsl_to_hex(real32 h, real32 s, real32 l) {
    h /= 360;
    s /= 100;
    l /= 100;
    real32 r, g, b;
    if (s == 0) {
        r = g = b = l;
    } else {
        real32 q = l < 0.5f ? l * (1 + s) : l + s - l * s;
        real32 p = 2 * l - q;
        r = hue_to_rgb(p, q, h + 1.0f / 3);
        g = hue_to_rgb(p, q, h);
        b = hue_to_rgb(p, q, h - 1.0f / 3);
    }
    return glm::vec3(r, g, b);
}

glm::vec3 color_from_index(int index) {
    real32 color_wheel_cycle = floorf(index / 6.0f);
    real32 darkness_cycle = floorf(index / 12.0f);
    real32 spacing = (360.0f / 6.0f);
    real32 offset = color_wheel_cycle == 0 ? 0 : spacing / (color_wheel_cycle + 2);
    real32 hue = spacing * (index % 6) + offset;
    real32 saturation = 100.0f;
    real32 lightness = 1.0f / (2 + darkness_cycle) * 100;
    return hsl_to_hex(hue, saturation, lightness);
}