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<?php

namespace App\Services\Email;

use DOMDocument;
use Exception;
use App\Services\Logger;

/**
 * HTML Validator
 *
 * Validates and sanitizes HTML content for emails.
 *
 * @package App\Services\Email
 */
class HtmlValidator
{
    /**
     * @var Logger Logger service
     */
    private Logger $logger;

    /**
     * HtmlValidator constructor
     */
    public function __construct()
    {
        $this->logger = new Logger();
    }

    /**
     * Ensure HTML is well-formed before sending
     *
     * @param string $html The HTML content to validate
     * @return string Validated HTML content
     */
    public function validate(string $html): string
    {
        try {
            // Use DOMDocument for proper HTML validation
            $dom = new DOMDocument('1.0', 'UTF-8');

            // Preserve special characters
            $html = htmlspecialchars_decode(htmlentities($html, ENT_QUOTES, 'UTF-8'), ENT_QUOTES);

            // Suppress libxml errors but store them for inspection
            libxml_use_internal_errors(true);

            // Load HTML into DOMDocument
            @$dom->loadHTML('<!DOCTYPE html><html lang="en"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body>' . $html . '</body></html>', LIBXML_HTML_NOIMPLIED | LIBXML_HTML_NODEFDTD);

            // Get validation errors
            $errors = libxml_get_errors();
            libxml_clear_errors();

            // Log validation issues but don't break functionality
            if (count($errors) > 0) {
                $this->logger->warning('HTML validation issues in email', [
                    'errors_count' => count($errors)
                ]);
            }

            // Return repaired HTML
            return $dom->saveHTML($dom->documentElement->lastChild);
        } catch (Exception $e) {
            // If any error occurs, log it but return the original HTML
            $this->logger->error('HTML validation failed: ' . $e->getMessage());
            return $html;
        }
    }
}