<?php

namespace App\Image;

use Jcupitt\Vips\Interpretation;

class Processor {
    public static function brightness($image, float $brightness = 1.0, float $saturation = 1.0, float $hue = 0.0) {
        $oldInterpretation = $image->interpretation;
        $hue %= 360;
        if ($hue < 0) {
            $hue = 360 + $hue;
        }
        if ($image->hasAlpha()) {
            $imageWithoutAlpha = $image->extract_band(0, ['n' => $image->bands - 1]);
            $alpha = $image->extract_band($image->bands - 1, ['n' => 1]);
            return $imageWithoutAlpha
                ->colourspace(Interpretation::LCH)
                ->linear([$brightness, $saturation, 1.0], [0.0, 0.0, $hue])
                ->colourspace($oldInterpretation)
                ->bandjoin($alpha);
        }
        return $image
            ->colourspace(Interpretation::LCH)
            ->linear([$brightness, $saturation, 1.0], [0.0, 0.0, $hue])
            ->colourspace($oldInterpretation);
    }
}