<?php
/**
 * File Change Monitor Script (Final Optimized Version)
 * Detects Added / Modified / Deleted files inside your /domains folder.
 * Fully supports Hostinger symlink structure.
 * Correctly excludes cron-log.txt and internal files.
 */

date_default_timezone_set('Asia/Kolkata');

// === SETTINGS ===
$mainFolder   = '/home/u915722082/domains';     // Main folder to monitor
$logFile      = __DIR__ . '/cron-log.txt';      // Log file
$oldListFile  = __DIR__ . '/filelist.json';     // Snapshot file

// Initial Log
file_put_contents($logFile, "\n=== Scan Start: " . date('Y-m-d H:i:s') . " ===\n", FILE_APPEND);

// === FUNCTION: SCAN ALL FILES RECURSIVELY ===
function getAllFiles($dir) {
    $allFiles = [];

    // IMPORTANT: FOLLOW SYMLINKS (Hostinger required)
    $rii = new RecursiveIteratorIterator(
        new RecursiveDirectoryIterator(
            $dir, 
            FilesystemIterator::SKIP_DOTS | FilesystemIterator::FOLLOW_SYMLINKS
        )
    );

    // Files to exclude from scanning
    $excludeFiles = [
        realpath(__FILE__),
        realpath(__DIR__ . '/cron-log.txt'),
        realpath(__DIR__ . '/filelist.json'),
        '/home/u915722082/domains/rrg-iitm.com/public_html/total_views.txt',
        '/home/u915722082/domains/rrg-iitm.com/public_html/visitor-ips.txt',
        '/home/u915722082/domains/rrg-iitm.com/public_html/unique-visitors.txt',
    ];

    foreach ($rii as $file) {
        if ($file->isFile()) {

            $path = $file->getPathname();
            $relativePath = str_replace('\\', '/', $path);

            // Skip cron-log.txt universally (avoid false modification logs)
            if (basename($path) === 'cron-log.txt') continue;

            // Skip script, snapshot, and manually excluded files
            if (in_array(realpath($path), $excludeFiles)) continue;

            // Skip session folders
            if (preg_match('#/storage/framework/sessions/#', $relativePath)) continue;

            // Record file details
            $allFiles[$path] = [
                'size'  => $file->getSize(),
                'mtime' => $file->getMTime(),
            ];
        }
    }

    return $allFiles;
}

// === LOAD PREVIOUS SNAPSHOT ===
$previousData = file_exists($oldListFile)
    ? json_decode(file_get_contents($oldListFile), true)
    : [];

$currentData = getAllFiles($mainFolder);

// === COMPARE FILES ===
$added = array_diff_key($currentData, $previousData);
$deleted = array_diff_key($previousData, $currentData);
$modified = [];

foreach ($currentData as $file => $info) {
    if (isset($previousData[$file])) {
        if (
            $info['size'] !== $previousData[$file]['size'] ||
            $info['mtime'] !== $previousData[$file]['mtime']
        ) {
            $modified[$file] = $info;
        }
    }
}

// === LOG CHANGES ===
if (!empty($added) || !empty($deleted) || !empty($modified)) {
    $log = "=== CHANGE DETECTED (" . date('Y-m-d H:i:s') . ") ===\n";

    if (!empty($added)) {
        $log .= "Added Files:\n";
        foreach ($added as $file => $info) {
            $log .= " + $file\n";
        }
        $log .= "\n";
    }

    if (!empty($modified)) {
        $log .= "Modified Files:\n";
        foreach ($modified as $file => $info) {
            $log .= " * $file\n";
        }
        $log .= "\n";
    }

    if (!empty($deleted)) {
        $log .= "Deleted Files:\n";
        foreach ($deleted as $file => $info) {
            $log .= " - $file\n";
        }
        $log .= "\n";
    }

    $log .= "--------------------------------------------\n";

    file_put_contents($logFile, $log, FILE_APPEND);
}

// === SAVE NEW SNAPSHOT (Pretty JSON) ===
file_put_contents($oldListFile, json_encode($currentData, JSON_PRETTY_PRINT));

// Final Log
file_put_contents($logFile, "Scan Completed: " . date('Y-m-d H:i:s') . "\n", FILE_APPEND);

?>