<?php

function hexToHsl($hex) {
    $hex = array($hex[0].$hex[1], $hex[2].$hex[3], $hex[4].$hex[5]);
    $rgb = array_map(function($part) {
        return hexdec($part) / 255;
    }, $hex);

    $max = max($rgb);
    $min = min($rgb);

    $l = ($max + $min) / 2;

    if ($max == $min) {
        $h = $s = 0;
    } else {
        $diff = $max - $min;
        $s = $l > 0.5 ? $diff / (2 - $max - $min) : $diff / ($max + $min);

        switch($max) {
            case $rgb[0]:
                $h = ($rgb[1] - $rgb[2]) / $diff + ($rgb[1] < $rgb[2] ? 6 : 0);
                break;
            case $rgb[1]:
                $h = ($rgb[2] - $rgb[0]) / $diff + 2;
                break;
            case $rgb[2]:
                $h = ($rgb[0] - $rgb[1]) / $diff + 4;
                break;
        }

        $h /= 6;
    }
    //TODO: Maybe return values not changed? For now this seems easier like so
    return array($h*360, $s*100, $l*100);
}

function hslToHex($hsl) {
	list($h, $s, $l) = $hsl;
	if ($s == 0) $s = 0.000001;
		
	$q = $l < 0.5 ? $l * (1 + $s) : $l + $s - $l * $s;
	$p = 2 * $l - $q;

	$r = hue2rgb($p, $q, $h + 1/3);
	$g = hue2rgb($p, $q, $h);
	$b = hue2rgb($p, $q, $h - 1/3);

	return rgb2hex($r) . rgb2hex($g) . rgb2hex($b);
}

function hue2rgb($p, $q, $t) {
    if ($t < 0) $t += 1;
    if ($t > 1) $t -= 1;
    if ($t < 1/6) return $p + ($q - $p) * 6 * $t;
    if ($t < 1/2) return $q;
    if ($t < 2/3) return $p + ($q - $p) * (2/3 - $t) * 6;

    return $p;
}

function rgb2hex($rgb) {
    return str_pad(dechex($rgb * 255), 2, '0', STR_PAD_LEFT);
}


function getColor($name,$default){
	//Get color from the Customizer in the form #rrggbb and delete the '#'    
    $hex = substr(
		esc_attr(
			get_theme_mod($name, $default)
		),
		1
    );
    //Convert Value rrggbb to hsl.
    //Produces (HUE: in [0,1] of 360°, SAT: in [0,1], LIG: in [0,1])
    

    // This is now done in hexToHsl() directly.
    //$hue = hexToHsl($hex);
    // $hue[0] *= 360;
    // $hue[1] *= 100;
    // $hue[2] *= 100;

    return hexToHsl($hex);
}