#!/usr/bin/php8.2
<?php

use Spatie\Color\Hex;

require __DIR__.'/vendor/autoload.php';

$input = $argv[1] ?? null;
$name = $argv[2] ?? null;
$nextPrimaryColor = $argv[3] ?? null;

if (empty($input) || !file_exists($input)) {
    exit(1);
}

if (empty($name)) {
    exit(1);
}

if (empty($nextPrimaryColor)) {
    exit(1);
}

$prefixes = [
    'color-primary',
    'color-primary-dark',
    'color-primary-light',
    'color-primary-alpha',
];

$properties = [];

foreach ($prefixes as $prefix) {
    $properties[] = sprintf('--%s', $prefix);

    for ($u = 1; $u < 100; ++$u) {
        $properties[] = sprintf('--%s-%d', $prefix, $u);
    }
}

$content = file_get_contents($input);

$currentPrimaryColor = '#fb923c';

$currentPrimaryColorH = (int) preg_replace('/hsl\(([0-9+]+),.+$/', '$1', Hex::fromString($currentPrimaryColor)->toHsl());
$nextPrimaryColorH = (int) preg_replace('/hsl\(([0-9]+),.+$/', '$1', Hex::fromString($nextPrimaryColor)->toHsl());

$hDiff = $nextPrimaryColorH - $currentPrimaryColorH;

foreach ($properties as $property) {
    preg_match_all(
        sprintf(
            '/%s: *((?<color>#[A-F0-9]{6})(?<alpha>[A-F0-9]{2}){0,1});/is',
            $property,
        ),
        $content,
        $matches,
        PREG_SET_ORDER
    );

    foreach ($matches as $match) {
        $match['alpha'] ??= 'ff';

        $color = Hex::fromString($match['color']);
        $hsl = $color->toHsla(hexdec($match['alpha']) * 1 / 255);

        $hsl = preg_replace_callback('/\(([0-9]+),/', function ($m) use ($hDiff) {
            return sprintf('(%d,', $m[1] + $hDiff);
        }, $hsl);

        $content = str_replace(
            $match[0],
            sprintf('%s: %s;', $property, $hsl),
            $content
        );
    }
}

file_put_contents(str_replace('.css', '-'.$name.'.css', $input), $content);