<?php

declare(strict_types=1);

namespace App\Providers;

use Illuminate\Support\{Arr, ServiceProvider};
use Illuminate\Support\Facades\Blade;

final class ScopeServiceProvider extends ServiceProvider
{
    /**
     * Bootstrap services.
     */
    public function boot(): void
    {
        $this->registerScopeDirective();
    }

    public function registerScopeDirective(): void
    {
        /**
         * All credits from this blade directive goes to Konrad Kalemba.
         * Just copied and modified for my very specific use case.
         *
         * https://github.com/konradkalemba/blade-components-scoped-slots
         */
        Blade::directive('scope', function ($expression) {
            // Split the expression by `top-level` commas (not in parentheses)
            $directiveArguments = preg_split("/,(?![^\(\(]*[\)\)])/", $expression);
            $directiveArguments = array_map('trim', $directiveArguments);

            // PHP 8.5 Safe Unpacking (Prevents "Undefined array key" crashes)
            $name = $directiveArguments[0] ?? "''";
            $functionArguments = $directiveArguments[1] ?? '';

            // Build function "uses" to inject extra external variables
            $uses = Arr::except(array_flip($directiveArguments), [$name, $functionArguments]);
            $uses = array_flip($uses);
            $uses[] = '$__env';
            $uses[] = '$__bladeCompiler';
            $uses = implode(',', $uses);

            /**
             * Slot names can`t contains dot , eg: `user.city`.
             * So we convert `user.city` to `user___city`
             *
             * Later, on component it will be replaced back.
             */
            $name = str_replace('.', '___', $name);

            // PHP 8.5 Safe Loop Check
            return "<?php \$__bladeCompiler = \$__bladeCompiler ?? null; \$__env->slot({$name}, function({$functionArguments}) use ({$uses}) { \$loop = !empty(\$__env->getLoopStack()) ? (object) \$__env->getLoopStack()[0] : null; ?>";
        });

        Blade::directive('endscope', fn () => '<?php }); ?>');
    }
}