Atomcms-edit/app/Services/ThemeService.php

<?php

namespace App\Services;

use Illuminate\Support\Facades\View;

class ThemeService
{
    private const string DEFAULT_THEME = 'atom';

    private ?string $activeTheme = null;

    private ?string $parentTheme = null;

    public function set(string $theme, ?string $parentTheme = null): void
    {
        $this->clear();

        $basePath = config('theme.base_path', base_path('resources/themes'));

        if ($parentTheme) {
            View::prependLocation("{$basePath}/{$parentTheme}/views");
            $this->parentTheme = $parentTheme;
        }

        View::prependLocation("{$basePath}/{$theme}/views");
        $this->activeTheme = $theme;

        $this->registerVendorNamespaces($theme, $basePath);
    }

    public function active(): ?string
    {
        return $this->activeTheme;
    }

    public function parent(): ?string
    {
        return $this->parentTheme;
    }

    public function resolve(?string $theme = null): string
    {
        return $theme ?? $this->activeTheme ?? self::DEFAULT_THEME;
    }

    public function clear(): void
    {
        $this->activeTheme = null;
        $this->parentTheme = null;
    }

    private function registerVendorNamespaces(string $theme, string $basePath): void
    {
        $vendorPath = "{$basePath}/{$theme}/views/vendor";

        if (! is_dir($vendorPath)) {
            return;
        }

        $directories = scandir($vendorPath);

        foreach ($directories as $namespace) {
            if ($namespace !== '.' && $namespace !== '..') {
                View::prependNamespace($namespace, "{$vendorPath}/{$namespace}");
            }
        }
    }
}