Helpddesk/Modules/Stylist/Html/ThemeHtmlBuilder.php

<?php

namespace Modules\Stylist\Html;

use Illuminate\Support\HtmlString;
use Modules\Stylist\Theme\Loader;
use Modules\Stylist\Theme\Stylist;
use Modules\Stylist\Theme\Theme;
use Modules\Stylist\Theme\UrlGenerator;

final class ThemeHtmlBuilder
{
    public function __construct(private readonly Stylist $stylist, private readonly UrlGenerator $url, private readonly Loader $loader) {}

    public function stylesheet(?string $path = null): HtmlString
    {
        if ($path !== null) {
            $theme = $this->stylist->current();
            if (! $theme->has($path)) {
                return new HtmlString('');
            }

            return new HtmlString('<link rel="stylesheet" href="'.e($this->url->forTheme($theme, $path)).'">');
        }

        $tags = [];
        foreach (array_reverse($this->themeChain()) as $theme) {
            $stylesheet = $theme->stylesheet();
            if ($stylesheet !== '' && $theme->has($stylesheet)) {
                $tags[] = '<link rel="stylesheet" href="'.e($this->url->forTheme($theme, $stylesheet)).'">';
            }
        }

        return new HtmlString(implode('', $tags));
    }

    public function script(?string $path = null): HtmlString
    {
        if ($path !== null) {
            $theme = $this->stylist->current();
            if (! $theme->has($path)) {
                return new HtmlString('');
            }

            return new HtmlString('<script src="'.e($this->url->forTheme($theme, $path)).'" defer></script>');
        }

        $tags = [];
        foreach (array_reverse($this->themeChain()) as $theme) {
            $script = $theme->script();
            if ($script !== '' && $theme->has($script)) {
                $tags[] = '<script src="'.e($this->url->forTheme($theme, $script)).'" defer></script>';
            }
        }

        return new HtmlString(implode('', $tags));
    }

    public function variables(): HtmlString
    {
        $theme = $this->stylist->current();
        $default = $this->declarations($this->stylist->variables());
        $rules = [':root{'.$default.'}'];

        foreach ($theme->appearances() as $name => $definition) {
            $vars = (array) data_get($definition, 'variables', []);
            if ($vars) {
                $rules[] = ':root[data-appearance="'.$this->selector($name).'"]{'.$this->declarations($vars).'}';
            }
        }
        foreach ($theme->accents() as $name => $definition) {
            $vars = (array) data_get($definition, 'variables', []);
            if ($vars) {
                $rules[] = ':root[data-accent="'.$this->selector($name).'"]{'.$this->declarations($vars).'}';
            }
        }

        if ($theme->appearances() === [] && $theme->accents() === []) {
            return new HtmlString('<style>'.implode('', $rules).'</style>');
        }

        $appearance = json_encode($this->stylist->appearance(), JSON_HEX_TAG | JSON_HEX_AMP | JSON_HEX_APOS | JSON_HEX_QUOT);
        $accent = json_encode($this->stylist->accent(), JSON_HEX_TAG | JSON_HEX_AMP | JSON_HEX_APOS | JSON_HEX_QUOT);
        $themeKey = json_encode($theme->key(), JSON_HEX_TAG | JSON_HEX_AMP | JSON_HEX_APOS | JSON_HEX_QUOT);
        $hasAppearances = $theme->appearances() !== [] ? 'true' : 'false';
        $hasAccents = $theme->accents() !== [] ? 'true' : 'false';

        $script = <<<JS
<script>(function(){var d=document.documentElement,k={$themeKey},ha={$hasAppearances},hc={$hasAccents},a=ha?(localStorage.getItem('stylist:'+k+':appearance')||{$appearance}):'',c=hc?(localStorage.getItem('stylist:'+k+':accent')||{$accent}):'';function apply(){d.dataset.theme=k;if(ha){var dark=a==='dark'||((a==='auto'||a==='system')&&matchMedia('(prefers-color-scheme: dark)').matches);d.dataset.appearance=dark?'dark':'light';d.classList.toggle('dark',dark)}if(hc){d.dataset.accent=c}}apply();window.StylistTheme={setAppearance:function(v){if(!ha)return;a=v;localStorage.setItem('stylist:'+k+':appearance',v);apply()},setAccent:function(v){if(!hc)return;c=v;localStorage.setItem('stylist:'+k+':accent',v);apply()},appearance:function(){return a},accent:function(){return c}};if(ha){matchMedia('(prefers-color-scheme: dark)').addEventListener?.('change',function(){if(a==='auto'||a==='system')apply()})}document.dispatchEvent(new CustomEvent('stylist:ready',{detail:window.StylistTheme}))})();</script>
JS;

        return new HtmlString('<style>'.implode('', $rules).'</style>'.$script);
    }

    public function switcher(): HtmlString
    {
        $theme = $this->stylist->current();
        $appearances = array_keys($theme->appearances());
        $accents = array_keys($theme->accents());

        if ($appearances === [] && $accents === []) {
            return new HtmlString('');
        }

        $appearanceOptions = collect($appearances)->map(fn ($name) => '<option value="'.e($name).'">'.e(ucfirst($name)).'</option>')->implode('');
        $accentOptions = collect($accents)->map(fn ($name) => '<option value="'.e($name).'">'.e(ucfirst($name)).'</option>')->implode('');
        $appearanceSelect = $appearances ? '<label>Appearance <select data-stylist-appearance>'.$appearanceOptions.'</select></label>' : '';
        $accentSelect = $accents ? '<label>Accent <select data-stylist-accent>'.$accentOptions.'</select></label>' : '';

        return new HtmlString('<div data-stylist-switcher class="stylist-theme-switcher">'.$appearanceSelect.$accentSelect.'</div><script>document.addEventListener("stylist:ready",function(){document.querySelectorAll("[data-stylist-switcher]").forEach(function(root){var a=root.querySelector("[data-stylist-appearance]"),c=root.querySelector("[data-stylist-accent]");if(a){a.value=StylistTheme.appearance();a.addEventListener("change",function(){StylistTheme.setAppearance(a.value)})}if(c){c.value=StylistTheme.accent();c.addEventListener("change",function(){StylistTheme.setAccent(c.value)})}})});</script>');
    }

    /** @return array<int, Theme> */
    private function themeChain(): array
    {
        $chain = [];
        $theme = $this->stylist->current();
        $seen = [];

        while (! isset($seen[$theme->key()])) {
            $seen[$theme->key()] = true;
            $chain[] = $theme;
            $parent = $theme->parent();

            if (! $parent) {
                break;
            }

            try {
                $theme = $this->loader->find($parent);
            } catch (\Throwable) {
                break;
            }
        }

        return $chain;
    }

    private function declarations(array $variables): string
    {
        return collect($variables)
            ->filter(fn ($value, $key) => is_string($key) && (is_string($value) || is_numeric($value)))
            ->map(fn ($value, string $key) => '--'.ltrim($key, '-').': '.e((string) $value).';')
            ->implode('');
    }

    private function selector(string $value): string
    {
        return preg_replace('/[^a-z0-9_-]/i', '', $value) ?: 'default';
    }
}