<?php

/**
 * @package     MokoSuiteCross
 * @subpackage  com_mokosuitecross
 * @author      Moko Consulting <hello@mokoconsulting.tech>
 * @copyright   Copyright (C) 2026 Moko Consulting. All rights reserved.
 * @license     GNU General Public License version 3 or later; see LICENSE
 * SPDX-License-Identifier: GPL-3.0-or-later
 */

namespace Joomla\Component\MokoSuiteCross\Administrator\Helper;

defined('_JEXEC') or die;

use Joomla\CMS\Component\ComponentHelper;
use Joomla\CMS\Factory;
use Joomla\CMS\Plugin\PluginHelper;
use Joomla\CMS\Uri\Uri;
use Joomla\Component\MokoSuiteCross\Administrator\Helper\CredentialHelper;
use Joomla\Component\MokoSuiteCross\Administrator\Service\MokoSuiteCrossServiceInterface;

/**
 * Shared queue processor used by:
 *   - System plugin onAfterRender (page-load processing)
 *   - Task scheduler plugin (Joomla scheduled task)
 *
 * Handles: queued posts, failed retries, scheduled posts, and log cleanup.
 * Uses a simple DB-based lock to prevent concurrent execution.
 */
class QueueProcessor
{
    /**
     * Process the post queue: dispatch queued posts, retry failed, fire scheduled.
     *
     * @param   int  $batchSize  Max posts to process per run
     *
     * @return  array  ['processed' => int, 'succeeded' => int, 'failed' => int, 'skipped' => int]
     */
    public static function processQueue(int $batchSize = 10): array
    {
        $result = ['processed' => 0, 'succeeded' => 0, 'failed' => 0, 'skipped' => 0];

        if (!self::acquireLock()) {
            $result['skipped'] = -1;

            return $result;
        }

        try {
            $db = Factory::getDbo();
            $componentParams = ComponentHelper::getParams('com_mokosuitecross');
            $maxRetry   = (int) $componentParams->get('retry_max', 3);
            $retryDelay = (int) $componentParams->get('retry_delay', 300);
            $now        = Factory::getDate()->toSql();

            // Build service plugin map
            $pluginMap = self::getServicePluginMap();

            // 1. Process queued posts
            $query = $db->getQuery(true)
                ->select('p.*, s.service_type, s.credentials, s.params AS service_params')
                ->from($db->quoteName('#__mokosuitecross_posts', 'p'))
                ->join('INNER', $db->quoteName('#__mokosuitecross_services', 's')
                    . ' ON ' . $db->quoteName('s.id') . ' = ' . $db->quoteName('p.service_id'))
                ->where($db->quoteName('p.status') . ' = ' . $db->quote('queued'))
                ->where('(' . $db->quoteName('p.scheduled_at') . ' IS NULL OR '
                    . $db->quoteName('p.scheduled_at') . ' <= ' . $db->quote($now) . ')')
                ->where($db->quoteName('s.published') . ' = 1')
                ->order($db->quoteName('p.created') . ' ASC')
                ->setLimit($batchSize);

            $db->setQuery($query);
            $queuedPosts = $db->loadObjectList() ?: [];

            // 2. Process failed posts eligible for retry (exponential backoff)
            // Retry 1 waits retryDelay, retry 2 waits retryDelay*2, retry 3 waits retryDelay*4, etc.
            $query = $db->getQuery(true)
                ->select('p.*, s.service_type, s.credentials, s.params AS service_params')
                ->from($db->quoteName('#__mokosuitecross_posts', 'p'))
                ->join('INNER', $db->quoteName('#__mokosuitecross_services', 's')
                    . ' ON ' . $db->quoteName('s.id') . ' = ' . $db->quoteName('p.service_id'))
                ->where($db->quoteName('p.status') . ' = ' . $db->quote('failed'))
                ->where($db->quoteName('p.retry_count') . ' < ' . $maxRetry)
                ->where($db->quoteName('p.modified') . ' <= DATE_SUB(NOW(), INTERVAL ('
                    . (int) $retryDelay . ' * POW(2, ' . $db->quoteName('p.retry_count') . ')) SECOND)')
                ->where($db->quoteName('s.published') . ' = 1')
                ->order($db->quoteName('p.modified') . ' ASC')
                ->setLimit($batchSize);

            $db->setQuery($query);
            $retryPosts = $db->loadObjectList() ?: [];

            // 3. Recover stale "posting" entries (stuck > 10 minutes)
            $staleQuery = $db->getQuery(true)
                ->update($db->quoteName('#__mokosuitecross_posts'))
                ->set($db->quoteName('status') . ' = ' . $db->quote('queued'))
                ->set($db->quoteName('modified') . ' = ' . $db->quote($now))
                ->where($db->quoteName('status') . ' = ' . $db->quote('posting'))
                ->where($db->quoteName('modified') . ' < DATE_SUB(NOW(), INTERVAL 600 SECOND)');
            $db->setQuery($staleQuery);
            $db->execute();

            $allPosts = array_merge($queuedPosts, $retryPosts);

            foreach ($allPosts as $post) {
                $result['processed']++;

                $plugin = $pluginMap[$post->service_type] ?? null;

                if (!$plugin) {
                    $result['skipped']++;
                    continue;
                }

                $isRetry = ($post->status === 'failed');

                if ($isRetry) {
                    $newRetryCount = (int) $post->retry_count + 1;

                    // If this is the last retry attempt, mark permanently failed on failure
                    if ($newRetryCount >= $maxRetry) {
                        $db->setQuery(
                            $db->getQuery(true)
                                ->update($db->quoteName('#__mokosuitecross_posts'))
                                ->set($db->quoteName('status') . ' = ' . $db->quote('permanently_failed'))
                                ->set($db->quoteName('retry_count') . ' = ' . $newRetryCount)
                                ->set($db->quoteName('error_message') . ' = CONCAT(' . $db->quoteName('error_message') . ', ' . $db->quote(' [max retries exceeded]') . ')')
                                ->set($db->quoteName('modified') . ' = ' . $db->quote(Factory::getDate()->toSql()))
                                ->where($db->quoteName('id') . ' = ' . (int) $post->id)
                        );
                        $db->execute();

                        self::log($db, (int) $post->id, (int) $post->service_id, 'error',
                            sprintf('Permanently failed %s: max retries (%d) exceeded', $post->service_type, $maxRetry));

                        $result['failed']++;
                        continue;
                    }

                    $db->setQuery(
                        $db->getQuery(true)
                            ->update($db->quoteName('#__mokosuitecross_posts'))
                            ->set($db->quoteName('retry_count') . ' = ' . $newRetryCount)
                            ->where($db->quoteName('id') . ' = ' . (int) $post->id)
                    );
                    $db->execute();
                }

                // Mark as posting
                $db->setQuery(
                    $db->getQuery(true)
                        ->update($db->quoteName('#__mokosuitecross_posts'))
                        ->set($db->quoteName('status') . ' = ' . $db->quote('posting'))
                        ->set($db->quoteName('modified') . ' = ' . $db->quote(Factory::getDate()->toSql()))
                        ->where($db->quoteName('id') . ' = ' . (int) $post->id)
                );
                $db->execute();

                $credentials = CredentialHelper::decrypt($post->credentials ?: '');
                $params      = json_decode($post->service_params ?: '{}', true) ?: [];

                // Token auto-refresh before posting
                OAuthHelper::refreshTokenIfNeeded((int) $post->service_id, $credentials);

                // Extract intro image for media attachment
                $media = [];

                if (!empty($post->article_id)) {
                    $imgQuery = $db->getQuery(true)
                        ->select($db->quoteName('images'))
                        ->from($db->quoteName('#__content'))
                        ->where($db->quoteName('id') . ' = ' . (int) $post->article_id);
                    $db->setQuery($imgQuery);
                    $imgJson = $db->loadResult();

                    if ($imgJson) {
                        $imgData = json_decode($imgJson);

                        if (!empty($imgData->image_intro)) {
                            $media[] = Uri::root() . ltrim($imgData->image_intro, '/');
                        }
                    }
                }

                // Lifecycle event: before post
                $cancel = false;
                $message = $post->message;

                try {
                    $dispatcher = Factory::getApplication()->getDispatcher();
                    $beforeEvent = new \Joomla\Event\Event('onMokoSuiteCrossBeforePost', [(int) $post->id, &$message, $post->service_type, &$cancel]);
                    $dispatcher->dispatch('onMokoSuiteCrossBeforePost', $beforeEvent);
                } catch (\Throwable $e) {
                    // Dispatcher may not be available
                }

                if ($cancel) {
                    $db->setQuery(
                        $db->getQuery(true)
                            ->update($db->quoteName('#__mokosuitecross_posts'))
                            ->set($db->quoteName('status') . ' = ' . $db->quote('cancelled'))
                            ->set($db->quoteName('modified') . ' = ' . $db->quote(Factory::getDate()->toSql()))
                            ->where($db->quoteName('id') . ' = ' . (int) $post->id)
                    );
                    $db->execute();

                    self::log($db, (int) $post->id, (int) $post->service_id, 'info',
                        sprintf('Post to %s cancelled by onMokoSuiteCrossBeforePost event', $post->service_type));

                    $result['skipped']++;
                    continue;
                }

                try {
                    $apiResult = $plugin->publish($message, $media, $credentials, $params);

                    if (!empty($apiResult['success'])) {
                        $db->setQuery(
                            $db->getQuery(true)
                                ->update($db->quoteName('#__mokosuitecross_posts'))
                                ->set($db->quoteName('status') . ' = ' . $db->quote('posted'))
                                ->set($db->quoteName('platform_post_id') . ' = ' . $db->quote($apiResult['platform_post_id'] ?? ''))
                                ->set($db->quoteName('platform_response') . ' = ' . $db->quote(json_encode($apiResult['response'] ?? [])))
                                ->set($db->quoteName('posted_at') . ' = ' . $db->quote(Factory::getDate()->toSql()))
                                ->set($db->quoteName('modified') . ' = ' . $db->quote(Factory::getDate()->toSql()))
                                ->where($db->quoteName('id') . ' = ' . (int) $post->id)
                        );
                        $db->execute();

                        self::log($db, (int) $post->id, (int) $post->service_id, 'info',
                            sprintf('%s to %s (ID: %s)', $isRetry ? 'Retry succeeded' : 'Posted', $post->service_type, $apiResult['platform_post_id'] ?? 'n/a'));

                        // Lifecycle event: after successful post
                        try {
                            $afterEvent = new \Joomla\Event\Event('onMokoSuiteCrossAfterPost', [(int) $post->id, $post->service_type, $apiResult]);
                            $dispatcher->dispatch('onMokoSuiteCrossAfterPost', $afterEvent);
                        } catch (\Throwable $e) {
                            // Non-critical
                        }

                        $result['succeeded']++;
                    } else {
                        $errorMsg = $apiResult['response']['error'] ?? json_encode($apiResult['response'] ?? []);

                        $db->setQuery(
                            $db->getQuery(true)
                                ->update($db->quoteName('#__mokosuitecross_posts'))
                                ->set($db->quoteName('status') . ' = ' . $db->quote('failed'))
                                ->set($db->quoteName('error_message') . ' = ' . $db->quote(mb_substr($errorMsg, 0, 1000)))
                                ->set($db->quoteName('platform_response') . ' = ' . $db->quote(json_encode($apiResult['response'] ?? [])))
                                ->set($db->quoteName('modified') . ' = ' . $db->quote(Factory::getDate()->toSql()))
                                ->where($db->quoteName('id') . ' = ' . (int) $post->id)
                        );
                        $db->execute();

                        self::log($db, (int) $post->id, (int) $post->service_id, 'error',
                            sprintf('Failed %s: %s', $post->service_type, mb_substr($errorMsg, 0, 500)));

                        // Lifecycle event: post failed
                        try {
                            $failedEvent = new \Joomla\Event\Event('onMokoSuiteCrossPostFailed', [(int) $post->id, $post->service_type, $errorMsg]);
                            $dispatcher->dispatch('onMokoSuiteCrossPostFailed', $failedEvent);
                        } catch (\Throwable $e) {
                            // Non-critical
                        }

                        $result['failed']++;
                    }
                } catch (\Throwable $e) {
                    $db->setQuery(
                        $db->getQuery(true)
                            ->update($db->quoteName('#__mokosuitecross_posts'))
                            ->set($db->quoteName('status') . ' = ' . $db->quote('failed'))
                            ->set($db->quoteName('error_message') . ' = ' . $db->quote(mb_substr($e->getMessage(), 0, 1000)))
                            ->set($db->quoteName('modified') . ' = ' . $db->quote(Factory::getDate()->toSql()))
                            ->where($db->quoteName('id') . ' = ' . (int) $post->id)
                    );
                    $db->execute();

                    self::log($db, (int) $post->id, (int) $post->service_id, 'error',
                        sprintf('Exception %s: %s', $post->service_type, mb_substr($e->getMessage(), 0, 500)));

                    // Lifecycle event: post failed (exception)
                    try {
                        $failedEvent = new \Joomla\Event\Event('onMokoSuiteCrossPostFailed', [(int) $post->id, $post->service_type, $e->getMessage()]);
                        $dispatcher->dispatch('onMokoSuiteCrossPostFailed', $failedEvent);
                    } catch (\Throwable $ex) {
                        // Non-critical
                    }

                    $result['failed']++;
                }
            }

            // 3. Clean up old logs
            self::cleanupLogs($db, $componentParams);

        } finally {
            self::releaseLock();
        }

        return $result;
    }

    /**
     * Process evergreen re-shares: find articles marked as evergreen whose last
     * successful post to each service was longer ago than the configured interval,
     * and create new queue entries for them.
     *
     * @return  array  ['queued' => int]
     */
    public static function processEvergreen(): array
    {
        $result = ['queued' => 0];

        $componentParams = ComponentHelper::getParams('com_mokosuitecross');

        if (!$componentParams->get('evergreen_enabled', 1)) {
            return $result;
        }

        $defaultInterval = (int) $componentParams->get('evergreen_default_interval', 30);
        $maxPerRun       = (int) $componentParams->get('evergreen_max_per_run', 3);

        $db  = Factory::getDbo();
        $now = Factory::getDate()->toSql();

        // Find published articles with evergreen=1 in attribs
        $query = $db->getQuery(true)
            ->select('c.id, c.attribs')
            ->from($db->quoteName('#__content', 'c'))
            ->where($db->quoteName('c.state') . ' = 1')
            ->where('JSON_EXTRACT(' . $db->quoteName('c.attribs') . ', ' . $db->quote('$.mokosuitecross_evergreen') . ') = ' . $db->quote('1'));

        $db->setQuery($query);
        $articles = $db->loadObjectList() ?: [];

        if (empty($articles)) {
            return $result;
        }

        // Load all published services
        $query = $db->getQuery(true)
            ->select('id, service_type')
            ->from($db->quoteName('#__mokosuitecross_services'))
            ->where($db->quoteName('published') . ' = 1');

        $db->setQuery($query);
        $services = $db->loadObjectList() ?: [];

        if (empty($services)) {
            return $result;
        }

        // Import service plugins (not used for direct dispatch here, but ensures
        // they are loaded in case any lifecycle events depend on them)
        PluginHelper::importPlugin('mokosuitecross');

        // Batch pre-load: latest posted_at per article+service (eliminates N*M queries)
        $articleIds = implode(',', array_map(function ($a) { return (int) $a->id; }, $articles));
        $serviceIds = implode(',', array_map(function ($s) { return (int) $s->id; }, $services));

        $query = $db->getQuery(true)
            ->select(['article_id', 'service_id', 'MAX(' . $db->quoteName('posted_at') . ') AS last_posted'])
            ->from($db->quoteName('#__mokosuitecross_posts'))
            ->where($db->quoteName('article_id') . ' IN (' . $articleIds . ')')
            ->where($db->quoteName('service_id') . ' IN (' . $serviceIds . ')')
            ->where($db->quoteName('status') . ' = ' . $db->quote('posted'))
            ->group(['article_id', 'service_id']);
        $db->setQuery($query);
        $lastPostedRows = $db->loadObjectList() ?: [];

        $lastPostedMap = [];
        foreach ($lastPostedRows as $row) {
            $lastPostedMap[$row->article_id . ':' . $row->service_id] = $row->last_posted;
        }

        // Batch pre-load: existing queued/posting entries
        $query = $db->getQuery(true)
            ->select(['article_id', 'service_id'])
            ->from($db->quoteName('#__mokosuitecross_posts'))
            ->where($db->quoteName('article_id') . ' IN (' . $articleIds . ')')
            ->where($db->quoteName('service_id') . ' IN (' . $serviceIds . ')')
            ->where($db->quoteName('status') . ' IN (' . $db->quote('queued') . ',' . $db->quote('posting') . ')');
        $db->setQuery($query);
        $pendingRows = $db->loadObjectList() ?: [];

        $pendingSet = [];
        foreach ($pendingRows as $row) {
            $pendingSet[$row->article_id . ':' . $row->service_id] = true;
        }

        foreach ($articles as $article) {
            if ($result['queued'] >= $maxPerRun) {
                break;
            }

            $attribs  = json_decode($article->attribs ?? '{}', true) ?: [];
            $interval = (int) ($attribs['mokosuitecross_evergreen_interval'] ?? $defaultInterval);

            if ($interval < 1) {
                $interval = $defaultInterval;
            }

            // Per-article service filter
            $selectedServiceIds = $attribs['mokosuitecross_services'] ?? null;

            if (is_array($selectedServiceIds) && !empty($selectedServiceIds)) {
                $selectedServiceIds = array_map('intval', $selectedServiceIds);
            } else {
                $selectedServiceIds = null;
            }

            // Load the full article for template rendering
            $fullArticle = null;

            foreach ($services as $service) {
                if ($result['queued'] >= $maxPerRun) {
                    break;
                }

                // Per-article service filter
                if ($selectedServiceIds !== null && !in_array((int) $service->id, $selectedServiceIds, true)) {
                    continue;
                }

                $key = $article->id . ':' . $service->id;

                // Check last successful post from batch-loaded map
                $lastPosted = $lastPostedMap[$key] ?? null;

                if (empty($lastPosted)) {
                    // Never posted — skip, the initial cross-post will handle it
                    continue;
                }

                // Check if interval has elapsed
                $dueDate = Factory::getDate($lastPosted . ' + ' . $interval . ' days');

                if ($dueDate->toUnix() > Factory::getDate()->toUnix()) {
                    continue;
                }

                // Skip if there's already a queued/posting entry
                if (isset($pendingSet[$key])) {
                    continue;
                }

                // Load full article if not already loaded
                if ($fullArticle === null) {
                    $query = $db->getQuery(true)
                        ->select('*')
                        ->from($db->quoteName('#__content'))
                        ->where($db->quoteName('id') . ' = ' . (int) $article->id);
                    $db->setQuery($query);
                    $fullArticle = $db->loadObject();

                    if (!$fullArticle) {
                        break;
                    }
                }

                // Render message using default template
                $template = $componentParams->get('default_template', "{title}\n\n{url}");
                $message  = self::renderEvergreenMessage($db, $fullArticle, $template);

                // Create queue entry
                $post = (object) [
                    'article_id'        => (int) $article->id,
                    'service_id'        => (int) $service->id,
                    'status'            => 'queued',
                    'message'           => $message,
                    'platform_post_id'  => '',
                    'platform_response' => '',
                    'error_message'     => '',
                    'retry_count'       => 0,
                    'created'           => $now,
                    'modified'          => $now,
                ];

                $db->insertObject('#__mokosuitecross_posts', $post);

                self::log($db, $db->insertid(), (int) $service->id, 'info',
                    sprintf('Evergreen re-share queued for article %d to %s (interval: %d days)',
                        $article->id, $service->service_type, $interval));

                $result['queued']++;
            }
        }

        return $result;
    }

    /**
     * Render a message for an evergreen re-share using the default template.
     */
    private static function renderEvergreenMessage($db, object $article, string $template): string
    {
        $url = \Joomla\CMS\Uri\Uri::root() . 'index.php?option=com_content&view=article&id=' . $article->id;

        if (!empty($article->catid)) {
            $url .= '&catid=' . $article->catid;
        }

        $categoryName = '';

        if (!empty($article->catid)) {
            $query = $db->getQuery(true)
                ->select($db->quoteName('title'))
                ->from($db->quoteName('#__categories'))
                ->where($db->quoteName('id') . ' = ' . (int) $article->catid);
            $db->setQuery($query);
            $categoryName = $db->loadResult() ?: '';
        }

        $authorName = '';

        if (!empty($article->created_by)) {
            $query = $db->getQuery(true)
                ->select($db->quoteName('name'))
                ->from($db->quoteName('#__users'))
                ->where($db->quoteName('id') . ' = ' . (int) $article->created_by);
            $db->setQuery($query);
            $authorName = $db->loadResult() ?: '';
        }

        $introImage = '';
        $images = json_decode($article->images ?? '{}');

        if (!empty($images->image_intro)) {
            $introImage = \Joomla\CMS\Uri\Uri::root() . ltrim($images->image_intro, '/');
        }

        // Resolve article tags
        $tagNames = [];

        if (!empty($article->id)) {
            $query = $db->getQuery(true)
                ->select($db->quoteName('t.title'))
                ->from($db->quoteName('#__tags', 't'))
                ->join('INNER', $db->quoteName('#__contentitem_tag_map', 'm')
                    . ' ON ' . $db->quoteName('m.tag_id') . ' = ' . $db->quoteName('t.id'))
                ->where($db->quoteName('m.type_alias') . ' = ' . $db->quote('com_content.article'))
                ->where($db->quoteName('m.content_item_id') . ' = ' . (int) $article->id)
                ->where($db->quoteName('t.published') . ' = 1');
            $db->setQuery($query);
            $tagNames = $db->loadColumn() ?: [];
        }

        $tagsComma = implode(', ', $tagNames);
        $hashtags  = implode(' ', array_map(function ($tag) {
            return '#' . preg_replace('/\s+/', '', $tag);
        }, $tagNames));

        $replacements = [
            '{title}'     => $article->title ?? '',
            '{introtext}' => strip_tags(mb_substr($article->introtext ?? '', 0, 280)),
            '{fulltext}'  => strip_tags(mb_substr($article->fulltext ?? '', 0, 500)),
            '{url}'       => $url,
            '{image}'     => $introImage,
            '{category}'  => $categoryName,
            '{author}'    => $authorName,
            '{date}'      => Factory::getDate($article->publish_up ?? 'now')->format('Y-m-d'),
            '{tags}'      => $tagsComma,
            '{hashtags}'  => $hashtags,
        ];

        $message = str_replace(array_keys($replacements), array_values($replacements), $template);

        // Resolve custom field placeholders: {field:field_name}
        $message = preg_replace_callback('/\{field:([a-zA-Z0-9_-]+)\}/', function ($matches) use ($db, $article) {
            $fieldName = $matches[1];
            $query = $db->getQuery(true)
                ->select('fv.value')
                ->from($db->quoteName('#__fields_values', 'fv'))
                ->join('INNER', $db->quoteName('#__fields', 'f') . ' ON f.id = fv.field_id')
                ->where('f.name = ' . $db->quote($fieldName))
                ->where('fv.item_id = ' . (int) $article->id);
            $db->setQuery($query);
            return $db->loadResult() ?: '';
        }, $message);

        return $message;
    }

    /**
     * Manually retry one or more failed/permanently_failed posts.
     *
     * Resets status to 'queued' and retry_count to 0 so the queue processor
     * picks them up on the next run.
     *
     * @param   array  $postIds  Post IDs to retry
     *
     * @return  int  Number of posts re-queued
     */
    public static function retryPosts(array $postIds): int
    {
        if (empty($postIds)) {
            return 0;
        }

        $db  = Factory::getDbo();
        $now = Factory::getDate()->toSql();
        $ids = implode(',', array_map('intval', $postIds));

        $query = $db->getQuery(true)
            ->update($db->quoteName('#__mokosuitecross_posts'))
            ->set($db->quoteName('status') . ' = ' . $db->quote('queued'))
            ->set($db->quoteName('retry_count') . ' = 0')
            ->set($db->quoteName('error_message') . ' = ' . $db->quote(''))
            ->set($db->quoteName('modified') . ' = ' . $db->quote($now))
            ->where($db->quoteName('id') . ' IN (' . $ids . ')')
            ->where($db->quoteName('status') . ' IN (' . $db->quote('failed') . ',' . $db->quote('permanently_failed') . ')');

        $db->setQuery($query);
        $db->execute();
        $count = $db->getAffectedRows();

        if ($count > 0) {
            self::log($db, null, null, 'info', sprintf('Manual retry: %d post(s) re-queued', $count));
        }

        return $count;
    }

    /**
     * Retry all failed posts for a specific service.
     *
     * @param   int  $serviceId  Service ID
     *
     * @return  int  Number of posts re-queued
     */
    public static function retryService(int $serviceId): int
    {
        $db  = Factory::getDbo();
        $now = Factory::getDate()->toSql();

        $query = $db->getQuery(true)
            ->update($db->quoteName('#__mokosuitecross_posts'))
            ->set($db->quoteName('status') . ' = ' . $db->quote('queued'))
            ->set($db->quoteName('retry_count') . ' = 0')
            ->set($db->quoteName('error_message') . ' = ' . $db->quote(''))
            ->set($db->quoteName('modified') . ' = ' . $db->quote($now))
            ->where($db->quoteName('service_id') . ' = ' . $serviceId)
            ->where($db->quoteName('status') . ' IN (' . $db->quote('failed') . ',' . $db->quote('permanently_failed') . ')');

        $db->setQuery($query);
        $db->execute();
        $count = $db->getAffectedRows();

        if ($count > 0) {
            self::log($db, null, $serviceId, 'info', sprintf('Bulk retry: %d post(s) re-queued for service %d', $count, $serviceId));
        }

        return $count;
    }

    /**
     * Check if there are pending items in the queue.
     *
     * @return  bool
     */
    public static function hasPendingWork(): bool
    {
        $db = Factory::getDbo();

        $componentParams = ComponentHelper::getParams('com_mokosuitecross');
        $maxRetry   = (int) $componentParams->get('retry_max', 3);
        $retryDelay = (int) $componentParams->get('retry_delay', 300);
        $now = Factory::getDate()->toSql();

        // Queued posts ready to go
        $query = $db->getQuery(true)
            ->select('COUNT(*)')
            ->from($db->quoteName('#__mokosuitecross_posts'))
            ->where($db->quoteName('status') . ' = ' . $db->quote('queued'))
            ->where('(' . $db->quoteName('scheduled_at') . ' IS NULL OR '
                . $db->quoteName('scheduled_at') . ' <= ' . $db->quote($now) . ')');
        $db->setQuery($query);
        $queued = (int) $db->loadResult();

        // Failed posts eligible for retry (exponential backoff matching processQueue)
        $query = $db->getQuery(true)
            ->select('COUNT(*)')
            ->from($db->quoteName('#__mokosuitecross_posts'))
            ->where($db->quoteName('status') . ' = ' . $db->quote('failed'))
            ->where($db->quoteName('retry_count') . ' < ' . $maxRetry)
            ->where($db->quoteName('modified') . ' <= DATE_SUB(NOW(), INTERVAL ('
                . (int) $retryDelay . ' * POW(2, ' . $db->quoteName('retry_count') . ')) SECOND)');
        $db->setQuery($query);
        $retryable = (int) $db->loadResult();

        return ($queued + $retryable) > 0;
    }

    /**
     * Import mokosuitecross plugins and build a type → plugin instance map.
     *
     * @return  array<string, MokoSuiteCrossServiceInterface>
     */
    private static function getServicePluginMap(): array
    {
        PluginHelper::importPlugin('mokosuitecross');

        // In Joomla 5+ with SubscriberInterface, plugins receive the Event object
        // as their first argument. When they do $services[] = $this, they append to
        // the Event via ArrayAccess at numeric indices starting at 1.
        $servicePlugins = [];
        $event = new \Joomla\Event\Event('onMokoSuiteCrossGetServices', [$servicePlugins]);

        try {
            Factory::getApplication()->getDispatcher()->dispatch(
                'onMokoSuiteCrossGetServices',
                $event
            );
        } catch (\Throwable $e) {
            // Dispatcher may not be available in all contexts
        }

        // Read plugins back from the Event's ArrayAccess indices
        $idx = 1;

        while (isset($event[$idx])) {
            $servicePlugins[] = $event[$idx];
            $idx++;
        }

        $map = [];

        foreach ($servicePlugins as $plugin) {
            if ($plugin instanceof MokoSuiteCrossServiceInterface) {
                $map[$plugin->getServiceType()] = $plugin;
            }
        }

        return $map;
    }

    /**
     * Delete logs older than the configured retention period.
     */
    private static function cleanupLogs($db, $componentParams): void
    {
        $retentionDays = (int) $componentParams->get('log_retention_days', 90);

        if ($retentionDays <= 0) {
            return;
        }

        $cutoff = Factory::getDate('now - ' . $retentionDays . ' days')->toSql();

        $query = $db->getQuery(true)
            ->delete($db->quoteName('#__mokosuitecross_logs'))
            ->where($db->quoteName('created') . ' < ' . $db->quote($cutoff));

        $db->setQuery($query);
        $db->execute();
    }

    /**
     * Acquire a database lock to prevent concurrent queue processing.
     *
     * Uses MySQL GET_LOCK() or PostgreSQL pg_advisory_lock() when available,
     * falling back to a timestamp-based check for other databases.
     */
    private static function acquireLock(): bool
    {
        $db = Factory::getDbo();

        try {
            $serverType = $db->getServerType();

            if ($serverType === 'mysql' || $serverType === 'mariadb') {
                $db->setQuery("SELECT GET_LOCK('mokosuitecross_queue', 0)");

                return (int) $db->loadResult() === 1;
            }

            if ($serverType === 'postgresql') {
                $db->setQuery("SELECT pg_try_advisory_lock(hashtext('mokosuitecross_queue'))");

                return (bool) $db->loadResult();
            }
        } catch (\Throwable $e) {
            // Fall through to timestamp-based lock
        }

        return self::acquireTimestampLock($db);
    }

    /**
     * Release the database lock.
     */
    private static function releaseLock(): void
    {
        $db = Factory::getDbo();

        try {
            $serverType = $db->getServerType();

            if ($serverType === 'mysql' || $serverType === 'mariadb') {
                $db->setQuery("SELECT RELEASE_LOCK('mokosuitecross_queue')");
                $db->execute();

                return;
            }

            if ($serverType === 'postgresql') {
                $db->setQuery("SELECT pg_advisory_unlock(hashtext('mokosuitecross_queue'))");
                $db->execute();

                return;
            }
        } catch (\Throwable $e) {
            // Fall through to timestamp-based release
        }

        self::releaseTimestampLock($db);
    }

    /**
     * Timestamp-based lock fallback for databases without advisory locks.
     *
     * Uses an atomic UPDATE with a WHERE clause to prevent TOCTOU race
     * conditions. The lock is considered stale after 120 seconds.
     */
    private static function acquireTimestampLock($db): bool
    {
        $now = time();
        $staleThreshold = $now - 120;

        // Atomic: only succeeds if lock is absent (0) or stale
        $params = ComponentHelper::getParams('com_mokosuitecross');
        $oldParams = $params->toString();
        $params->set('queue_lock_time', $now);
        $newParams = $params->toString();

        $query = $db->getQuery(true)
            ->update($db->quoteName('#__extensions'))
            ->set($db->quoteName('params') . ' = ' . $db->quote($newParams))
            ->where($db->quoteName('element') . ' = ' . $db->quote('com_mokosuitecross'))
            ->where($db->quoteName('type') . ' = ' . $db->quote('component'))
            ->where('(' . $db->quoteName('params') . ' NOT LIKE ' . $db->quote('%"queue_lock_time"%')
                . ' OR ' . $db->quoteName('params') . ' LIKE ' . $db->quote('%"queue_lock_time":0%')
                . ' OR ' . $db->quoteName('params') . ' LIKE ' . $db->quote('%"queue_lock_time":"0"%')
                . ')');

        $db->setQuery($query);
        $db->execute();

        if ($db->getAffectedRows() > 0) {
            return true;
        }

        // Check if the existing lock is stale
        $params = ComponentHelper::getParams('com_mokosuitecross');
        $lockTime = (int) $params->get('queue_lock_time', 0);

        if ($lockTime > 0 && $lockTime <= $staleThreshold) {
            // Force acquire stale lock
            $params->set('queue_lock_time', $now);

            $query = $db->getQuery(true)
                ->update($db->quoteName('#__extensions'))
                ->set($db->quoteName('params') . ' = ' . $db->quote($params->toString()))
                ->where($db->quoteName('element') . ' = ' . $db->quote('com_mokosuitecross'))
                ->where($db->quoteName('type') . ' = ' . $db->quote('component'));

            $db->setQuery($query);
            $db->execute();

            return true;
        }

        return false;
    }

    /**
     * Release the timestamp-based lock.
     */
    private static function releaseTimestampLock($db): void
    {
        $params = ComponentHelper::getParams('com_mokosuitecross');
        $params->set('queue_lock_time', 0);

        $query = $db->getQuery(true)
            ->update($db->quoteName('#__extensions'))
            ->set($db->quoteName('params') . ' = ' . $db->quote($params->toString()))
            ->where($db->quoteName('element') . ' = ' . $db->quote('com_mokosuitecross'))
            ->where($db->quoteName('type') . ' = ' . $db->quote('component'));

        $db->setQuery($query);
        $db->execute();
    }

    /**
     * Write a log entry.
     */
    private static function log($db, ?int $postId, ?int $serviceId, string $level, string $message): void
    {
        $log = (object) [
            'post_id'    => $postId,
            'service_id' => $serviceId,
            'level'      => $level,
            'message'    => mb_substr($message, 0, 2000),
            'context'    => '{}',
            'created'    => Factory::getDate()->toSql(),
        ];

        $db->insertObject('#__mokosuitecross_logs', $log);
    }
}