<?php

/**
 * @package     MokoJoomBackup
 * @subpackage  com_mokobackup
 * @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\MokoBackup\Administrator\Controller;

defined('_JEXEC') or die;

use Joomla\CMS\MVC\Controller\AdminController;
use Joomla\CMS\Router\Route;
use Joomla\Component\MokoBackup\Administrator\Engine\BackupEngine;
use Joomla\Component\MokoBackup\Administrator\Engine\RestoreEngine;

class BackupsController extends AdminController
{
	protected $text_prefix = 'COM_MOKOBACKUP_BACKUPS';

	public function getModel($name = 'Backup', $prefix = 'Administrator', $config = ['ignore_request' => true])
	{
		return parent::getModel($name, $prefix, $config);
	}

	/**
	 * Start a new backup using the specified profile.
	 *
	 * @return  void
	 */
	public function start(): void
	{
		$this->checkToken();

		$profileId   = $this->input->getInt('profile_id', 1);
		$description = $this->input->getString('description', '');

		$engine = new BackupEngine();
		$result = $engine->run($profileId, $description, 'backend');

		if ($result['success']) {
			$this->setMessage($result['message']);
		} else {
			$this->setMessage($result['message'], 'error');
		}

		$this->setRedirect(Route::_('index.php?option=com_mokobackup&view=backups', false));
	}

	/**
	 * Download a backup archive.
	 *
	 * @return  void
	 */
	public function download(): void
	{
		$id    = $this->input->getInt('id', 0);
		$model = $this->getModel('Backup');
		$item  = $model->getItem($id);

		if (!$item || !$item->id || !$item->filesexist || !is_file($item->absolute_path)) {
			$this->setMessage('COM_MOKOBACKUP_ERROR_FILE_NOT_FOUND', 'error');
			$this->setRedirect(Route::_('index.php?option=com_mokobackup&view=backups', false));

			return;
		}

		// Flush any output buffers to prevent HTML mixing with binary data
		while (@ob_end_clean()) {
			// clear all buffers
		}

		$filename = basename($item->archivename);
		$filesize = filesize($item->absolute_path);

		// Detect content type from file extension
		$contentType = str_ends_with($filename, '.tar.gz')
			? 'application/gzip'
			: 'application/zip';

		header('Content-Type: ' . $contentType);
		header('Content-Disposition: attachment; filename="' . $filename . '"');
		header('Content-Length: ' . $filesize);
		header('Cache-Control: no-cache, must-revalidate');
		header('Pragma: no-cache');

		readfile($item->absolute_path);

		$this->app->close();
	}

	/**
	 * Restore from a backup record.
	 *
	 * @return  void
	 */
	public function restore(): void
	{
		$this->checkToken();

		$id             = $this->input->getInt('id', 0);
		$restoreFiles   = (bool) $this->input->getInt('restore_files', 1);
		$restoreDb      = (bool) $this->input->getInt('restore_db', 1);
		$preserveConfig = (bool) $this->input->getInt('preserve_config', 1);
		$password       = $this->input->getString('encryption_password', '');

		if (!$id) {
			$this->setMessage('COM_MOKOBACKUP_ERROR_NO_RECORD_SELECTED', 'error');
			$this->setRedirect(Route::_('index.php?option=com_mokobackup&view=backups', false));

			return;
		}

		$engine = new RestoreEngine();
		$result = $engine->restore($id, $restoreFiles, $restoreDb, $preserveConfig, $password);

		if ($result['success']) {
			$this->setMessage($result['message']);
		} else {
			$this->setMessage($result['message'], 'error');
		}

		$this->setRedirect(Route::_('index.php?option=com_mokobackup&view=backups', false));
	}

	/**
	 * Verify integrity of a backup archive by re-computing SHA-256.
	 */
	public function verify(): void
	{
		$this->checkToken();

		$cid = $this->input->get('cid', [], 'array');
		$id  = !empty($cid) ? (int) $cid[0] : $this->input->getInt('id', 0);

		if (!$id) {
			$this->setMessage('COM_MOKOBACKUP_ERROR_NO_RECORD_SELECTED', 'error');
			$this->setRedirect(Route::_('index.php?option=com_mokobackup&view=backups', false));

			return;
		}

		$model = $this->getModel('Backup');
		$item  = $model->getItem($id);

		if (!$item || !$item->id) {
			$this->setMessage('COM_MOKOBACKUP_ERROR_NO_RECORD_SELECTED', 'error');
			$this->setRedirect(Route::_('index.php?option=com_mokobackup&view=backups', false));

			return;
		}

		if (!is_file($item->absolute_path)) {
			$this->setMessage('COM_MOKOBACKUP_ERROR_FILE_NOT_FOUND', 'error');
			$this->setRedirect(Route::_('index.php?option=com_mokobackup&view=backups', false));

			return;
		}

		if (empty($item->checksum)) {
			$this->setMessage('COM_MOKOBACKUP_VERIFY_NO_CHECKSUM', 'warning');
			$this->setRedirect(Route::_('index.php?option=com_mokobackup&view=backups', false));

			return;
		}

		$currentHash = hash_file('sha256', $item->absolute_path);

		if ($currentHash === $item->checksum) {
			$this->setMessage('COM_MOKOBACKUP_VERIFY_OK');
		} else {
			$this->setMessage('COM_MOKOBACKUP_VERIFY_FAILED', 'error');
		}

		$this->setRedirect(Route::_('index.php?option=com_mokobackup&view=backups', false));
	}
}