<?php

/**
 * @package     MokoSuiteBackup
 * @subpackage  com_mokosuitebackup
 * @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
 */

namespace Joomla\Component\MokoSuiteBackup\Administrator\Helper;

defined('_JEXEC') or die;

use Joomla\CMS\Factory;

/**
 * Lightweight helper for external consumers (bridge plugins, MCP servers, CLI tools)
 * to query MokoSuiteBackup status without bootstrapping the full component.
 *
 * Usage from any Joomla plugin:
 *   \Joomla\Component\MokoSuiteBackup\Administrator\Helper\BackupStatusHelper::getStatusSummary()
 */
class BackupStatusHelper
{
    /**
     * Check whether MokoSuiteBackup is installed and enabled.
     */
    public static function isInstalled(): bool
    {
        $db = Factory::getContainer()->get('DatabaseDriver');

        $query = $db->getQuery(true)
            ->select('COUNT(*)')
            ->from($db->quoteName('#__extensions'))
            ->where($db->quoteName('element') . ' = ' . $db->quote('pkg_mokosuitebackup'))
            ->where($db->quoteName('enabled') . ' = 1');

        return (int) $db->setQuery($query)->loadResult() > 0;
    }

    /**
     * Get the latest backup record for a given profile (or any profile).
     *
     * @param  int|null  $profileId  Limit to a specific profile, or null for any.
     * @return object|null  Record object or null if no backups exist.
     */
    public static function getLatestRecord(?int $profileId = null): ?object
    {
        $db    = Factory::getContainer()->get('DatabaseDriver');
        $query = $db->getQuery(true)
            ->select([
                $db->quoteName('r.id'),
                $db->quoteName('r.profile_id'),
                $db->quoteName('r.description'),
                $db->quoteName('r.status'),
                $db->quoteName('r.origin'),
                $db->quoteName('r.backup_type'),
                $db->quoteName('r.archivename'),
                $db->quoteName('r.total_size'),
                $db->quoteName('r.db_size'),
                $db->quoteName('r.files_count'),
                $db->quoteName('r.tables_count'),
                $db->quoteName('r.backupstart'),
                $db->quoteName('r.backupend'),
                $db->quoteName('r.filesexist'),
                $db->quoteName('r.remote_filename'),
                $db->quoteName('r.checksum'),
                $db->quoteName('p.title', 'profile_title'),
            ])
            ->from($db->quoteName('#__mokosuitebackup_records', 'r'))
            ->join('LEFT', $db->quoteName('#__mokosuitebackup_profiles', 'p') . ' ON p.id = r.profile_id')
            ->where($db->quoteName('r.status') . ' IN (' . implode(',', array_map([$db, 'quote'], ['complete', 'fail'])) . ')')
            ->order($db->quoteName('r.backupstart') . ' DESC');

        if ($profileId !== null) {
            $query->where($db->quoteName('r.profile_id') . ' = ' . (int) $profileId);
        }

        $query->setLimit(1);
        $record = $db->setQuery($query)->loadObject();

        return $record ?: null;
    }

    /**
     * Get a full status summary for heartbeat payloads.
     *
     * Returns an array suitable for JSON encoding in bridge heartbeats:
     * - latest backup status, time, size, destination
     * - total and recent (7-day) backup counts
     * - streak of consecutive successes
     *
     * @return array{installed: bool, latest: ?array, totals: array}
     */
    public static function getStatusSummary(): array
    {
        if (!self::isInstalled()) {
            return ['installed' => false, 'latest' => null, 'totals' => []];
        }

        $db = Factory::getContainer()->get('DatabaseDriver');

        // Latest completed/failed backup
        $latest      = self::getLatestRecord();
        $latestArray = null;

        if ($latest) {
            $latestArray = [
                'status'       => $latest->status,
                'backup_type'  => $latest->backup_type,
                'description'  => $latest->description,
                'backup_start' => $latest->backupstart,
                'backup_end'   => $latest->backupend,
                'total_size'   => (int) $latest->total_size,
                'destination'  => $latest->remote_filename ? 'remote' : 'local',
                'profile'      => $latest->profile_title,
                'origin'       => $latest->origin,
                'files_count'  => (int) $latest->files_count,
                'tables_count' => (int) $latest->tables_count,
            ];
        }

        // Totals
        $query = $db->getQuery(true)
            ->select([
                'COUNT(*) AS total',
                'SUM(CASE WHEN ' . $db->quoteName('status') . ' = ' . $db->quote('complete') . ' THEN 1 ELSE 0 END) AS success',
                'SUM(CASE WHEN ' . $db->quoteName('status') . ' = ' . $db->quote('fail') . ' THEN 1 ELSE 0 END) AS failed',
            ])
            ->from($db->quoteName('#__mokosuitebackup_records'));

        $allTime = $db->setQuery($query)->loadObject();

        // Recent (last 7 days)
        $query = $db->getQuery(true)
            ->select([
                'COUNT(*) AS total',
                'SUM(CASE WHEN ' . $db->quoteName('status') . ' = ' . $db->quote('complete') . ' THEN 1 ELSE 0 END) AS success',
                'SUM(CASE WHEN ' . $db->quoteName('status') . ' = ' . $db->quote('fail') . ' THEN 1 ELSE 0 END) AS failed',
            ])
            ->from($db->quoteName('#__mokosuitebackup_records'))
            ->where($db->quoteName('backupstart') . ' >= DATE_SUB(NOW(), INTERVAL 7 DAY)');

        $recent = $db->setQuery($query)->loadObject();

        // Success streak — count consecutive successes from latest backward
        $query = $db->getQuery(true)
            ->select($db->quoteName('status'))
            ->from($db->quoteName('#__mokosuitebackup_records'))
            ->where($db->quoteName('status') . ' IN (' . implode(',', array_map([$db, 'quote'], ['complete', 'fail'])) . ')')
            ->order($db->quoteName('backupstart') . ' DESC')
            ->setLimit(50);

        $statuses = $db->setQuery($query)->loadColumn();
        $streak   = 0;

        foreach ($statuses as $s) {
            if ($s === 'complete') {
                $streak++;
            } else {
                break;
            }
        }

        return [
            'installed' => true,
            'latest'    => $latestArray,
            'totals'    => [
                'all_time'       => (int) ($allTime->total ?? 0),
                'all_success'    => (int) ($allTime->success ?? 0),
                'all_failed'     => (int) ($allTime->failed ?? 0),
                'recent_total'   => (int) ($recent->total ?? 0),
                'recent_success' => (int) ($recent->success ?? 0),
                'recent_failed'  => (int) ($recent->failed ?? 0),
                'success_streak' => $streak,
            ],
        ];
    }
}