<?php

declare(strict_types=1);

namespace Box\Mod\Mailgateway;

use Pimple\Container;

class NotificationSettings
{
    private const CODES = ['mod_support_ticket_open', 'mod_support_ticket_staff_reply',
        'mod_support_ticket_staff_open', 'mod_support_ticket_staff_close'];

    public function __construct(private Container $di) {}

    private function hasMarker(string $subject): bool
    {
        return (bool) preg_match('/\[Ticket\s+#\s*{{\s*ticket\.id\s*}}\s*\]/i', $subject);
    }

    public function repair(): array
    {
        $email = $this->di['mod_service']('email');
        foreach (self::CODES as $code) {
            $template = $email->getTemplateRepository()->findOneByActionCode($code);
            if ($template === null) {
                $source = file_get_contents(dirname(__DIR__) . '/Support/templates/email/' . $code . '.html.twig');
                if (!is_string($source)
                    || !preg_match('/{%\s*block subject\s*%}(.*?){%\s*endblock\s*%}/s', $source, $subject)
                    || !preg_match('/{%\s*block content\s*%}(.*?){%\s*endblock\s*%}/s', $source, $content)) {
                    throw new \FOSSBilling\InformationException("Cannot configure $code: its default template is missing or invalid.");
                }
                $template = $email->templateCreate($code, trim($subject[1]), trim($content[1]),
                    $code === 'mod_support_ticket_open' ? 1 : 0, 'support');
            }
            $data = $email->templateToApiArray($template);
            if ($code !== 'mod_support_ticket_open' && !$data['enabled']) {
                continue;
            }
            $subject = $data['subject'] ?? '';
            $enabled = $code === 'mod_support_ticket_open' ? true : null;
            if (!$this->hasMarker($subject)) {
                // Keep the existing subject and body, adding only the routing marker.
                $email->updateTemplate($template, $enabled, null, '[Ticket #{{ ticket.id }}] ' . $subject);
            } elseif ($code === 'mod_support_ticket_open' && !$data['enabled']) {
                $email->updateTemplate($template, true);
            }
        }
        return $this->status();
    }

    public function status(): array
    {
        $email = $this->di['mod_service']('email');
        $errors = [];
        foreach (self::CODES as $code) {
            $template = $email->getTemplateRepository()->findOneByActionCode($code);
            if ($template === null) {
                $errors[] = "Open FOSSBilling Email settings and configure $code before enabling importing.";
                continue;
            }
            $data = $email->templateToApiArray($template);
            if (!$data['enabled']) {
                if ($code === 'mod_support_ticket_open') {
                    $errors[] = 'Enable mod_support_ticket_open in FOSSBilling Email settings to send ticket acknowledgements.';
                }
                continue;
            }
            // Check the documented dynamic marker without executing custom template code.
            if (!$this->hasMarker($data['subject'] ?? '')) {
                $errors[] = "Include [Ticket #{{ ticket.id }}] in the subject of $code in FOSSBilling Email settings.";
            }
        }
        return ['ready' => $errors === [], 'errors' => $errors];
    }
}