<?php

namespace Modules\Stylist\Services;

use Illuminate\Filesystem\Filesystem;
use Modules\Stylist\Theme\Theme;

final class ThemeAccessibilityValidator
{
    public function __construct(private readonly Filesystem $files) {}

    /** @return array<int, array{severity:string,message:string,file:string}> */
    public function validate(Theme $theme): array
    {
        $issues = [];
        foreach ($this->files->allFiles($theme->path().'/views') as $file) {
            $content = $file->getContents();
            $relative = $file->getRelativePathname();
            if (preg_match_all('/<img\b(?![^>]*\balt=)[^>]*>/i', $content, $matches)) {
                $issues[] = ['severity' => 'error', 'message' => count($matches[0]).' image(s) missing alt text.', 'file' => $relative];
            }
            if (preg_match('/<html\b(?![^>]*\blang=)/i', $content)) {
                $issues[] = ['severity' => 'warning', 'message' => 'HTML element is missing a lang attribute.', 'file' => $relative];
            }
            if (preg_match_all('/<button\b[^>]*>\s*(?:<[^>]+>\s*)*<\/button>/is', $content, $matches)) {
                $issues[] = ['severity' => 'warning', 'message' => count($matches[0]).' button(s) may lack an accessible name.', 'file' => $relative];
            }
        }

        return $issues;
    }
}