<?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
 *
 * Resolves placeholders like [HOST], [DATE], [PROFILE_NAME] in backup
 * directory paths and archive filename formats.
 */

namespace Joomla\Component\MokoSuiteBackup\Administrator\Engine;

defined('_JEXEC') or die;

use Joomla\CMS\Factory;
use Joomla\Component\MokoSuiteBackup\Administrator\Utility\BackupDirectory;

class PlaceholderResolver
{
	/**
	 * Supported placeholders and their descriptions (for documentation).
	 */
	public const PLACEHOLDERS = [
		'[HOST]'         => 'Server hostname',
		'[DATE]'         => 'Date as Ymd (e.g. 20260604)',
		'[TIME]'         => 'Time as His (e.g. 143025)',
		'[DATETIME]'     => 'Date and time as Ymd_His',
		'[YEAR]'         => 'Four-digit year',
		'[MONTH]'        => 'Two-digit month',
		'[DAY]'          => 'Two-digit day',
		'[HOUR]'         => 'Two-digit hour (24h)',
		'[MINUTE]'       => 'Two-digit minute',
		'[SECOND]'       => 'Two-digit second',
		'[PROFILE_ID]'   => 'Backup profile ID',
		'[PROFILE_NAME]' => 'Profile title (sanitized)',
		'[SITE_NAME]'    => 'Joomla site name (sanitized)',
		'[TYPE]'         => 'Backup type (full, database, files, differential)',
		'[RANDOM]'       => 'Random 6-character hex string',
		'[DEFAULT_DIR]'  => 'Default backup directory',
		'[HOME]'         => 'Home directory of the PHP process owner',
	];

	private array $replacements;

	/**
	 * @param   object  $profile  The backup profile object
	 */
	public function __construct(object $profile)
	{
		$now      = new \DateTimeImmutable('now');

		/* Resolve hostname: prefer HTTP_HOST (web), then try Joomla config (CLI), then system hostname */
		$rawHost = $_SERVER['HTTP_HOST'] ?? $_SERVER['SERVER_NAME'] ?? '';

		if (empty($rawHost) || $rawHost === 'localhost') {
			try {
				$app = Factory::getApplication();
				$liveSite = $app->get('live_site', '');

				if (!empty($liveSite)) {
					$parsed = parse_url($liveSite, PHP_URL_HOST);

					if (!empty($parsed)) {
						$rawHost = $parsed;
					}
				}
			} catch (\Throwable $e) {
				/* fallback */
			}
		}

		if (empty($rawHost)) {
			$rawHost = php_uname('n');
		}

		$hostname = preg_replace('/[^a-zA-Z0-9._-]/', '', $rawHost);

		$siteName = '';

		try {
			$siteName = Factory::getApplication()->get('sitename', '');
		} catch (\Throwable $e) {
			// Fallback: not critical
		}

		$this->replacements = [
			'[HOST]'         => $hostname,
			'[DATE]'         => $now->format('Ymd'),
			'[TIME]'         => $now->format('His'),
			'[DATETIME]'     => $now->format('Ymd_His'),
			'[YEAR]'         => $now->format('Y'),
			'[MONTH]'        => $now->format('m'),
			'[DAY]'          => $now->format('d'),
			'[HOUR]'         => $now->format('H'),
			'[MINUTE]'       => $now->format('i'),
			'[SECOND]'       => $now->format('s'),
			'[PROFILE_ID]'   => (string) ($profile->id ?? '0'),
			'[PROFILE_NAME]' => $this->sanitize($profile->title ?? 'default'),
			'[SITE_NAME]'    => $this->sanitize($siteName ?: 'joomla'),
			'[TYPE]'         => $profile->backup_type ?? 'full',
			'[RANDOM]'       => bin2hex(random_bytes(3)),
			'[DEFAULT_DIR]'  => BackupDirectory::getDefaultAbsolute(),
			'[HOME]'         => BackupDirectory::getHomeDirectory(),
		];
	}

	/**
	 * Replace all placeholders in a string.
	 *
	 * @param   string  $template  String containing [placeholder] tokens
	 *
	 * @return  string  Resolved string
	 */
	public function resolve(string $template): string
	{
		return str_replace(
			array_keys($this->replacements),
			array_values($this->replacements),
			$template
		);
	}

	/**
	 * Get the raw hostname value (for backward compatibility).
	 */
	public function getHostname(): string
	{
		return $this->replacements['[HOST]'];
	}

	/**
	 * Get the datetime tag value (for backward compatibility).
	 */
	public function getTag(): string
	{
		return $this->replacements['[DATETIME]'];
	}

	/**
	 * Sanitize a string for use in filenames/paths.
	 * Keeps alphanumerics, dots, hyphens, underscores. Replaces spaces with hyphens.
	 */
	private function sanitize(string $value): string
	{
		$value = str_replace(' ', '-', trim($value));

		return preg_replace('/[^a-zA-Z0-9._-]/', '', $value);
	}
}