<?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\Utility;

defined('_JEXEC') or die;

use Joomla\CMS\Factory;
use Joomla\Database\DatabaseInterface;

/**
 * Provides a public API for external plugins (e.g. MokoSuiteClient bridge)
 * to query backup status without depending on internal model internals.
 *
 * @since  01.22.07
 */
class BackupStatusHelper
{
	/**
	 * Get a summary of the latest backup status.
	 *
	 * Returns an array suitable for inclusion in heartbeat payloads.
	 *
	 * @param   int  $staleDays  Days without backup before status is degraded.
	 *
	 * @return  array
	 */
	public static function getStatus(int $staleDays = 7): array
	{
		try
		{
			$db = Factory::getContainer()->get(DatabaseInterface::class);
		}
		catch (\Throwable $e)
		{
			return ['installed' => true, 'status' => 'error', 'message' => 'Database unavailable'];
		}

		// Most recently inserted backup record (by ID, any status)
		$query = $db->getQuery(true)
			->select([
				$db->quoteName('id'),
				$db->quoteName('description'),
				$db->quoteName('status'),
				$db->quoteName('backup_type'),
				$db->quoteName('total_size'),
				$db->quoteName('backupstart'),
				$db->quoteName('backupend'),
				$db->quoteName('origin'),
				$db->quoteName('filesexist'),
			])
			->from($db->quoteName('#__mokosuitebackup_records'))
			->order($db->quoteName('id') . ' DESC');

		$db->setQuery($query, 0, 1);
		$latest = $db->loadObject();

		if (!$latest)
		{
			return [
				'installed' => true,
				'status'    => 'degraded',
				'message'   => 'No backups found',
			];
		}

		$db->setQuery(
			$db->getQuery(true)
				->select('COUNT(*)')
				->from($db->quoteName('#__mokosuitebackup_records'))
				->where($db->quoteName('status') . ' = ' . $db->quote('complete'))
		);
		$totalBackups = (int) $db->loadResult();

		$cutoff = date('Y-m-d H:i:s', strtotime("-{$staleDays} days"));
		$db->setQuery(
			$db->getQuery(true)
				->select('COUNT(*)')
				->from($db->quoteName('#__mokosuitebackup_records'))
				->where($db->quoteName('status') . ' = ' . $db->quote('complete'))
				->where($db->quoteName('backupstart') . ' >= ' . $db->quote($cutoff))
		);
		$recentBackups = (int) $db->loadResult();

		// Failures in last 7 days
		$db->setQuery(
			$db->getQuery(true)
				->select('COUNT(*)')
				->from($db->quoteName('#__mokosuitebackup_records'))
				->where($db->quoteName('status') . ' = ' . $db->quote('fail'))
				->where($db->quoteName('backupstart') . ' >= ' . $db->quote($cutoff))
		);
		$failCount7d = (int) $db->loadResult();

		// Determine overall status
		$daysSince = 999;

		if (!empty($latest->backupstart) && $latest->backupstart !== '0000-00-00 00:00:00')
		{
			$daysSince = (int) ((time() - strtotime($latest->backupstart)) / 86400);
		}

		$status = 'ok';

		if ($latest->status === 'fail')
		{
			$status = 'degraded';
		}
		elseif ($latest->status !== 'complete')
		{
			$status = ($latest->status === 'running') ? 'ok' : 'degraded';
		}
		elseif ($daysSince > $staleDays)
		{
			$status = 'degraded';
		}

		$sizeMb = $latest->total_size
			? round($latest->total_size / 1048576)
			: null;

		return [
			'installed'      => true,
			'status'         => $status,
			'last_backup'    => $latest->backupstart,
			'last_status'    => $latest->status,
			'last_size_mb'   => $sizeMb,
			'days_since'     => $daysSince,
			'backup_type'    => $latest->backup_type,
			'origin'         => $latest->origin,
			'total_backups'  => $totalBackups,
			'recent_7d'      => $recentBackups,
			'fail_count_7d'  => $failCount7d,
			'files_exist'    => (bool) $latest->filesexist,
			'description'    => $latest->description,
		];
	}

	/**
	 * Check if MokoSuiteBackup component is installed.
	 *
	 * Useful for external plugins that want to check before calling getStatus().
	 *
	 * @return  bool
	 */
	public static function isInstalled(): bool
	{
		try
		{
			$db = Factory::getContainer()->get(DatabaseInterface::class);

			$query = $db->getQuery(true)
				->select('COUNT(*)')
				->from($db->quoteName('#__extensions'))
				->where($db->quoteName('element') . ' = ' . $db->quote('com_mokosuitebackup'))
				->where($db->quoteName('type') . ' = ' . $db->quote('component'));

			$db->setQuery($query);

			return (int) $db->loadResult() > 0;
		}
		catch (\Throwable $e)
		{
			return false;
		}
	}
}