#pragma once
#include <array>
#include <cmath>
#include <algorithm>

namespace ZShell::services {

inline std::array<float, 3> kelvinToGain(int kelvin) {
	const double t = std::clamp(kelvin, 1000, 40000) / 100.0;
	double r, g, b;

	r = t <= 66.0
			? 1.0
			: std::clamp(
				  1.29293618606 * std::pow(t - 60.0, -0.1332047592), 0.0, 1.0);
	g = t <= 66.0
			? std::clamp(0.39008157876 * std::log(t) - 0.63184144378, 0.0, 1.0)
			: std::clamp(
				  1.12989086089 * std::pow(t - 60.0, -0.0755148492), 0.0, 1.0);
	b = t >= 66.0
			? 1.0
			: (t <= 19.0
				   ? 0.0
				   : std::clamp(
						 0.54320678911 * std::log(t - 10.0) - 1.19625408914,
						 0.0,
						 1.0));

	return {static_cast<float>(r), static_cast<float>(g), static_cast<float>(b)};
}

} // namespace ZShell::services