<?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
 *
 * Restores files from a staging directory to the Joomla root.
 * Skips database.sql and sensitive files that should not be overwritten.
 */

namespace Joomla\Component\MokoBackup\Administrator\Engine;

defined('_JEXEC') or die;

class FileRestorer
{
	private string $sourceDir;
	private string $targetDir;

	/**
	 * Files that should never be overwritten during restore.
	 * configuration.php is handled separately by the RestoreEngine.
	 */
	private const SKIP_FILES = [
		'configuration.php',
		'.htaccess',
		'web.config',
	];

	/**
	 * Files that are backup artifacts, not part of the site.
	 */
	private const EXCLUDE_FILES = [
		'database.sql',
	];

	public function __construct(string $sourceDir, string $targetDir)
	{
		$this->sourceDir = rtrim($sourceDir, '/\\');
		$this->targetDir = rtrim($targetDir, '/\\');
	}

	/**
	 * Copy files from staging to target, preserving directory structure.
	 *
	 * @return  int  Number of files restored
	 */
	public function restore(): int
	{
		$count = 0;
		$this->restoreDirectory('', $count);

		return $count;
	}

	private function restoreDirectory(string $relativePath, int &$count): void
	{
		$sourcePath = $this->sourceDir . ($relativePath ? '/' . $relativePath : '');

		if (!is_dir($sourcePath)) {
			return;
		}

		$handle = opendir($sourcePath);

		if ($handle === false) {
			return;
		}

		while (($entry = readdir($handle)) !== false) {
			if ($entry === '.' || $entry === '..') {
				continue;
			}

			$entryRelative = $relativePath ? $relativePath . '/' . $entry : $entry;
			$entrySource   = $sourcePath . '/' . $entry;
			$entryTarget   = $this->targetDir . '/' . $entryRelative;

			if (is_dir($entrySource)) {
				// Create target directory if it doesn't exist
				if (!is_dir($entryTarget)) {
					mkdir($entryTarget, 0755, true);
				}

				$this->restoreDirectory($entryRelative, $count);
			} elseif (is_file($entrySource)) {
				// Skip excluded files
				if (in_array($entry, self::EXCLUDE_FILES, true)) {
					continue;
				}

				// Skip protected files (only at root level)
				if ($relativePath === '' && in_array($entry, self::SKIP_FILES, true)) {
					continue;
				}

				// Ensure parent directory exists
				$parentDir = dirname($entryTarget);

				if (!is_dir($parentDir)) {
					mkdir($parentDir, 0755, true);
				}

				// Copy file, preserving permissions
				if (copy($entrySource, $entryTarget)) {
					// Try to match original permissions
					$perms = fileperms($entrySource);

					if ($perms !== false) {
						@chmod($entryTarget, $perms);
					}

					$count++;
				}
			}
		}

		closedir($handle);
	}
}