#!/usr/bin/env php
<?php
/* Copyright (C) 2026 Moko Consulting <hello@mokoconsulting.tech>
 *
 * This file is part of a Moko Consulting project.
 *
 * SPDX-License-Identifier: GPL-3.0-or-later
 *
 * FILE INFORMATION
 * DEFGROUP: MokoStandards.Scripts.Deploy
 * INGROUP: MokoStandards
 * REPO: https://git.mokoconsulting.tech/MokoConsulting/moko-platform
 * PATH: /deploy/sync-joomla.php
 * VERSION: 01.00.00
 * BRIEF: Sync Joomla site directories between two servers via rsync over SSH
 */

declare(strict_types=1);

class SyncJoomla
{
	/** @var string Path to source sftp-config.json */
	private string $sourceConfig = '';

	/** @var string Path to dest sftp-config.json */
	private string $destConfig = '';

	/** @var bool Sync standard Joomla directories only */
	private bool $rsyncMode = false;

	/** @var bool Sync everything under remote_path */
	private bool $fullMode = false;

	/** @var bool Dry-run (preview only) */
	private bool $dryRun = false;

	/** @var bool Verbose output */
	private bool $verbose = false;

	/** @var string[] Additional exclude patterns */
	private array $excludes = [];

	/** @var string Local relay directory */
	private string $relayDir = '/tmp/sync/';

	/** @var string[] Standard Joomla directories to sync */
	private array $joomlaDirs = [
		'administrator/components',
		'administrator/language',
		'administrator/modules',
		'administrator/templates',
		'components',
		'language',
		'layouts',
		'libraries',
		'media',
		'modules',
		'plugins',
		'templates',
	];

	/**
	 * Main entry point.
	 *
	 * @return int Exit code
	 */
	public function run(): int
	{
		$this->parseArgs();

		if (!$this->validate()) {
			return 1;
		}

		$source = $this->loadConfig($this->sourceConfig);
		$dest = $this->loadConfig($this->destConfig);

		if ($source === null || $dest === null) {
			return 1;
		}

		$this->log("Source: {$source['user']}@{$source['host']}:{$source['remote_path']}");
		$this->log("Dest:   {$dest['user']}@{$dest['host']}:{$dest['remote_path']}");

		if ($this->dryRun) {
			$this->log('[DRY-RUN] No files will be transferred.');
		}

		$this->prepareRelayDir();

		$dirs = $this->resolveDirs();
		$totalFiles = 0;
		$syncedDirs = 0;

		foreach ($dirs as $dir) {
			$this->log("--- Syncing: {$dir}");

			$pulled = $this->pullFromSource($source, $dir);
			if ($pulled === false) {
				$this->log("  WARNING: pull failed for {$dir}, skipping.");
				continue;
			}

			$pushed = $this->pushToDest($dest, $dir);
			if ($pushed === false) {
				$this->log("  WARNING: push failed for {$dir}, skipping.");
				continue;
			}

			$totalFiles += $pulled + $pushed;
			$syncedDirs++;
		}

		$this->cleanup();
		$this->log('');
		$this->log('=== Sync Summary ===');
		$this->log("Directories synced: {$syncedDirs}/" . count($dirs));
		$this->log("Rsync operations:   " . ($syncedDirs * 2) . " (pull + push)");

		if ($this->dryRun) {
			$this->log('Mode: dry-run (no files were transferred)');
		}

		return 0;
	}

	/**
	 * Parse command-line arguments.
	 */
	private function parseArgs(): void
	{
		global $argv;

		$i = 1;
		while ($i < count($argv)) {
			switch ($argv[$i]) {
				case '--source':
					$this->sourceConfig = $argv[++$i] ?? '';
					break;
				case '--dest':
					$this->destConfig = $argv[++$i] ?? '';
					break;
				case '--rsync':
					$this->rsyncMode = true;
					break;
				case '--full':
					$this->fullMode = true;
					break;
				case '--dry-run':
					$this->dryRun = true;
					break;
				case '--verbose':
					$this->verbose = true;
					break;
				case '--exclude':
					$this->excludes[] = $argv[++$i] ?? '';
					break;
				default:
					$this->log("Unknown argument: {$argv[$i]}");
					break;
			}
			$i++;
		}
	}

	/**
	 * Validate required arguments.
	 *
	 * @return bool True if valid
	 */
	private function validate(): bool
	{
		if ($this->sourceConfig === '' || $this->destConfig === '') {
			$this->log('ERROR: --source and --dest are required.');
			$this->printUsage();
			return false;
		}

		if (!$this->rsyncMode && !$this->fullMode) {
			$this->log('ERROR: Either --rsync or --full must be specified.');
			$this->printUsage();
			return false;
		}

		if ($this->rsyncMode && $this->fullMode) {
			$this->log('ERROR: --rsync and --full are mutually exclusive.');
			return false;
		}

		if (!file_exists($this->sourceConfig)) {
			$this->log("ERROR: Source config not found: {$this->sourceConfig}");
			return false;
		}

		if (!file_exists($this->destConfig)) {
			$this->log("ERROR: Dest config not found: {$this->destConfig}");
			return false;
		}

		return true;
	}

	/**
	 * Load and decode an sftp-config.json file.
	 *
	 * @param string $path Path to the config file
	 * @return array|null Parsed config or null on error
	 */
	private function loadConfig(string $path): ?array
	{
		$json = file_get_contents($path);
		if ($json === false) {
			$this->log("ERROR: Cannot read config: {$path}");
			return null;
		}

		// Strip // comments (Sublime Text SFTP format)
		$json = preg_replace('#^\s*//.*$#m', '', $json);
		$json = preg_replace('#,\s*([\]}])#', '$1', $json);

		$config = json_decode($json, true);
		if (!is_array($config)) {
			$this->log("ERROR: Invalid JSON in config: {$path}");
			return null;
		}

		$required = ['host', 'user', 'remote_path', 'ssh_key_file'];
		foreach ($required as $key) {
			if (empty($config[$key])) {
				$this->log("ERROR: Missing '{$key}' in config: {$path}");
				return null;
			}
		}

		if (!isset($config['port'])) {
			$config['port'] = 22;
		}

		return $config;
	}

	/**
	 * Resolve the list of directories to sync.
	 *
	 * @return string[] Directory paths (relative to remote_path)
	 */
	private function resolveDirs(): array
	{
		if ($this->fullMode) {
			return ['.'];
		}

		return $this->joomlaDirs;
	}

	/**
	 * Prepare the local relay directory.
	 */
	private function prepareRelayDir(): void
	{
		if (is_dir($this->relayDir)) {
			shell_exec("rm -rf " . escapeshellarg($this->relayDir));
		}

		mkdir($this->relayDir, 0755, true);
		$this->log("Relay directory: {$this->relayDir}");
	}

	/**
	 * Build common rsync exclude flags.
	 *
	 * configuration.php is always excluded — it contains per-environment
	 * database credentials and settings that must never be synced.
	 *
	 * @return string Exclude arguments for rsync
	 */
	private function buildExcludes(): string
	{
		$excludes = ['configuration.php'];
		$excludes = array_merge($excludes, $this->excludes);

		$flags = '';
		foreach ($excludes as $pattern) {
			$flags .= ' --exclude=' . escapeshellarg($pattern);
		}

		return $flags;
	}

	/**
	 * Build SSH command fragment for rsync.
	 *
	 * @param array $config Server config
	 * @return string The -e flag value for rsync
	 */
	private function buildSshCmd(array $config): string
	{
		$keyPath = escapeshellarg($config['ssh_key_file']);
		$port = (int) $config['port'];

		return "ssh -i {$keyPath} -p {$port} -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null";
	}

	/**
	 * Pull a directory from the source server to the local relay.
	 *
	 * @param array  $config Source server config
	 * @param string $dir    Relative directory to sync
	 * @return int|false Number of files or false on failure
	 */
	private function pullFromSource(array $config, string $dir): int|false
	{
		$remotePath = rtrim($config['remote_path'], '/') . '/' . ltrim($dir, './');
		$localPath = $this->relayDir . ltrim($dir, './');

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

		$sshCmd = $this->buildSshCmd($config);
		$excludes = $this->buildExcludes();
		$dryFlag = $this->dryRun ? ' --dry-run' : '';
		$verboseFlag = $this->verbose ? ' -v' : '';

		$remote = escapeshellarg("{$config['user']}@{$config['host']}:{$remotePath}/");
		$local = escapeshellarg("{$localPath}/");

		$cmd = "rsync -az --delete"
			. $dryFlag
			. $verboseFlag
			. $excludes
			. " -e " . escapeshellarg($sshCmd)
			. " {$remote} {$local}"
			. " 2>&1";

		$this->logVerbose("  PULL: {$cmd}");

		$output = [];
		$exitCode = 0;
		exec($cmd, $output, $exitCode);

		if ($exitCode !== 0) {
			$this->log("  ERROR (exit {$exitCode}): " . implode("\n", $output));
			return false;
		}

		$fileCount = count($output);
		$this->logVerbose("  Pulled {$fileCount} line(s) of output.");

		return $fileCount;
	}

	/**
	 * Push a directory from the local relay to the destination server.
	 *
	 * @param array  $config Dest server config
	 * @param string $dir    Relative directory to sync
	 * @return int|false Number of files or false on failure
	 */
	private function pushToDest(array $config, string $dir): int|false
	{
		$remotePath = rtrim($config['remote_path'], '/') . '/' . ltrim($dir, './');
		$localPath = $this->relayDir . ltrim($dir, './');

		$sshCmd = $this->buildSshCmd($config);
		$excludes = $this->buildExcludes();
		$dryFlag = $this->dryRun ? ' --dry-run' : '';
		$verboseFlag = $this->verbose ? ' -v' : '';

		$local = escapeshellarg("{$localPath}/");
		$remote = escapeshellarg("{$config['user']}@{$config['host']}:{$remotePath}/");

		$cmd = "rsync -az --delete"
			. $dryFlag
			. $verboseFlag
			. $excludes
			. " -e " . escapeshellarg($sshCmd)
			. " {$local} {$remote}"
			. " 2>&1";

		$this->logVerbose("  PUSH: {$cmd}");

		$output = [];
		$exitCode = 0;
		exec($cmd, $output, $exitCode);

		if ($exitCode !== 0) {
			$this->log("  ERROR (exit {$exitCode}): " . implode("\n", $output));
			return false;
		}

		$fileCount = count($output);
		$this->logVerbose("  Pushed {$fileCount} line(s) of output.");

		return $fileCount;
	}

	/**
	 * Clean up the relay directory.
	 */
	private function cleanup(): void
	{
		if (is_dir($this->relayDir)) {
			shell_exec("rm -rf " . escapeshellarg($this->relayDir));
			$this->logVerbose("Cleaned up relay directory.");
		}
	}

	/**
	 * Print usage information.
	 */
	private function printUsage(): void
	{
		$this->log('');
		$this->log('Usage: sync-joomla.php --source <config> --dest <config> [--rsync|--full] [options]');
		$this->log('');
		$this->log('Required:');
		$this->log('  --source <path>     sftp-config.json for source server');
		$this->log('  --dest <path>       sftp-config.json for dest server');
		$this->log('  --rsync             Sync standard Joomla directories');
		$this->log('  --full              Sync everything under the remote path');
		$this->log('');
		$this->log('Options:');
		$this->log('  --dry-run           Preview only, no files transferred');
		$this->log('  --verbose           Verbose output');
		$this->log('  --exclude <pattern> Additional exclude pattern (repeatable)');
	}

	/**
	 * Log a message to stdout.
	 *
	 * @param string $message Message to log
	 */
	private function log(string $message): void
	{
		echo $message . PHP_EOL;
	}

	/**
	 * Log a verbose message (only when --verbose is set).
	 *
	 * @param string $message Message to log
	 */
	private function logVerbose(string $message): void
	{
		if ($this->verbose) {
			$this->log($message);
		}
	}
}

$sync = new SyncJoomla();
exit($sync->run());