<?php

/**
 * High-Performance OPcache Preload Script for PHP 8.3-FPM
 * Optimized for Paymenter/VirtNet with Laravel 12, Filament 3, Livewire 3, Octane
 * 
 * Configure in php.ini or www.conf:
 *   opcache.preload=/var/www/html/preload.php
 *   opcache.preload_user=www-data
 *   opcache.memory_consumption=512
 *   opcache.interned_strings_buffer=128
 *   opcache.max_accelerated_files=50000
 *   opcache.validate_timestamps=0
 *   opcache.save_comments=1
 *   opcache.enable_file_override=1
 *   opcache.jit=1255
 *   opcache.jit_buffer_size=256M
 *   opcache.jit_hot_func=127
 *   opcache.jit_hot_loop=127
 *   opcache.jit_hot_return=8
 *   opcache.jit_hot_side_exit=8
 * 
 * After deployment run:
 *   php artisan optimize
 *   php artisan filament:optimize  
 *   php artisan view:cache
 *   php artisan event:cache
 *   php artisan icons:cache
 *   sudo systemctl reload php8.3-fpm
 */

declare(strict_types=1);

// Ensure OPcache is available
if (!function_exists('opcache_compile_file')) {
    die('OPcache extension is not loaded');
}

$basePath = __DIR__;

// Performance tracking
$stats = [
    'preloaded' => 0,
    'skipped' => 0,
    'errors' => [],
    'start_time' => hrtime(true),
    'start_memory' => memory_get_usage(true),
];

// =============================================================================
// PRELOAD FUNCTIONS
// =============================================================================

/**
 * Compile a single file into OPcache
 * Returns true if successfully compiled
 */
function preloadFile(string $path): bool
{
    global $stats;
    
    // Fast path checks
    if (!is_file($path) || !is_readable($path)) {
        return false;
    }
    
    // Skip empty files
    if (filesize($path) === 0) {
        return false;
    }

    try {
        if (@opcache_compile_file($path)) {
            $stats['preloaded']++;
            return true;
        }
    } catch (Throwable $e) {
        $stats['errors'][] = basename($path) . ': ' . $e->getMessage();
    }
    
    $stats['skipped']++;
    return false;
}

/**
 * Preload files from array with existence check
 */
function preloadFiles(array $files): void
{
    foreach ($files as $file) {
        preloadFile($file);
    }
}

/**
 * Recursively preload directory with filtering
 */
function preloadDirectory(string $dir, array $excludePatterns = [], int $maxDepth = 20): void
{
    if (!is_dir($dir) || !is_readable($dir)) {
        return;
    }

    $iterator = new RecursiveIteratorIterator(
        new RecursiveDirectoryIterator(
            $dir,
            FilesystemIterator::SKIP_DOTS | FilesystemIterator::FOLLOW_SYMLINKS
        ),
        RecursiveIteratorIterator::LEAVES_ONLY
    );
    $iterator->setMaxDepth($maxDepth);

    $files = [];
    foreach ($iterator as $file) {
        if (!$file->isFile() || $file->getExtension() !== 'php') {
            continue;
        }

        $path = $file->getRealPath();
        if ($path === false) {
            continue;
        }
        
        // Apply exclude patterns
        $skip = false;
        foreach ($excludePatterns as $pattern) {
            if (preg_match($pattern, $path)) {
                $skip = true;
                break;
            }
        }
        
        if (!$skip) {
            $files[] = $path;
        }
    }
    
    // Sort for consistent ordering (helps with JIT optimization)
    sort($files, SORT_STRING);
    
    foreach ($files as $path) {
        preloadFile($path);
    }
}

/**
 * Preload specific classes from a namespace (using Composer's classmap)
 */
function preloadClassmap(string $classmapFile): void
{
    if (!is_file($classmapFile)) {
        return;
    }
    
    $classmap = require $classmapFile;
    if (!is_array($classmap)) {
        return;
    }
    
    foreach ($classmap as $class => $file) {
        preloadFile($file);
    }
}

// Global exclusion patterns (tests, stubs, dev-only files)
$excludePatterns = [
    '#[/\\\\][Tt]ests?[/\\\\]#',
    '#[/\\\\][Ss]tubs?[/\\\\]#',
    '#[/\\\\][Ff]ixtures?[/\\\\]#',
    '#[/\\\\][Mm]ocks?[/\\\\]#',
    '#[Tt]est\.php$#',
    '#[Ss]tub\.php$#',
    '#[Ss]pec\.php$#',
    '#phpunit#i',
    '#[/\\\\]\.#', // Hidden files/dirs
];

// =============================================================================
// PHASE 1: COMPOSER AUTOLOADER (Load First - Critical)
// =============================================================================

// Autoloader must be preloaded first for class resolution
$composerFiles = [
    $basePath . '/vendor/composer/ClassLoader.php',
    $basePath . '/vendor/composer/InstalledVersions.php',
    $basePath . '/vendor/composer/autoload_real.php',
    $basePath . '/vendor/composer/autoload_static.php',
    $basePath . '/vendor/composer/autoload_classmap.php',
    $basePath . '/vendor/composer/autoload_files.php',
    $basePath . '/vendor/composer/autoload_namespaces.php',
    $basePath . '/vendor/composer/autoload_psr4.php',
    $basePath . '/vendor/autoload.php',
];

preloadFiles($composerFiles);

// Preload entire Composer classmap for maximum performance
if (is_file($basePath . '/vendor/composer/autoload_classmap.php')) {
    preloadClassmap($basePath . '/vendor/composer/autoload_classmap.php');
}

// =============================================================================
// PHASE 2: LARAVEL CACHED FILES (High Priority)
// =============================================================================

$laravelCacheFiles = [
    // Core cached files
    $basePath . '/bootstrap/cache/packages.php',
    $basePath . '/bootstrap/cache/services.php',
    $basePath . '/bootstrap/cache/config.php',
    $basePath . '/bootstrap/cache/routes-v7.php',
    $basePath . '/bootstrap/cache/events.php',
    
    // Filament cache
    $basePath . '/bootstrap/cache/filament.php',
    $basePath . '/bootstrap/cache/filament/panels.php',
    
    // Livewire cache
    $basePath . '/bootstrap/cache/livewire-components.php',
    
    // Icons cache (Blade Icons)
    $basePath . '/bootstrap/cache/blade-icons.php',
];

preloadFiles($laravelCacheFiles);

// =============================================================================
// PHASE 3: PSR INTERFACES (Required for type resolution)
// =============================================================================

$psrDirs = [
    $basePath . '/vendor/psr/container/src',
    $basePath . '/vendor/psr/http-message/src',
    $basePath . '/vendor/psr/http-client/src',
    $basePath . '/vendor/psr/http-factory/src',
    $basePath . '/vendor/psr/log/src',
    $basePath . '/vendor/psr/cache/src',
    $basePath . '/vendor/psr/simple-cache/src',
    $basePath . '/vendor/psr/event-dispatcher/src',
    $basePath . '/vendor/psr/clock/src',
];

foreach ($psrDirs as $dir) {
    preloadDirectory($dir, $excludePatterns);
}

// =============================================================================
// PHASE 4: SYMFONY COMPONENTS (Laravel's HTTP Foundation)
// =============================================================================

$symfonyComponents = [
    // HTTP Foundation (most critical)
    $basePath . '/vendor/symfony/http-foundation',
    
    // HTTP Kernel
    $basePath . '/vendor/symfony/http-kernel',
    
    // Routing
    $basePath . '/vendor/symfony/routing',
    
    // Event Dispatcher
    $basePath . '/vendor/symfony/event-dispatcher',
    $basePath . '/vendor/symfony/event-dispatcher-contracts',
    
    // Console (for Artisan commands)
    $basePath . '/vendor/symfony/console',
    
    // Error Handler
    $basePath . '/vendor/symfony/error-handler',
    
    // Finder
    $basePath . '/vendor/symfony/finder',
    
    // Process
    $basePath . '/vendor/symfony/process',
    
    // Service Contracts
    $basePath . '/vendor/symfony/service-contracts',
    
    // Translation
    $basePath . '/vendor/symfony/translation',
    $basePath . '/vendor/symfony/translation-contracts',
    
    // Var Dumper (for debugging)
    $basePath . '/vendor/symfony/var-dumper',
    
    // Mime
    $basePath . '/vendor/symfony/mime',
    
    // Mailer
    $basePath . '/vendor/symfony/mailer',
    
    // String (Slugger, etc.)
    $basePath . '/vendor/symfony/string',
    
    // UID
    $basePath . '/vendor/symfony/uid',
    
    // Clock
    $basePath . '/vendor/symfony/clock',
];

foreach ($symfonyComponents as $dir) {
    preloadDirectory($dir, $excludePatterns, 10);
}

// =============================================================================
// PHASE 5: LARAVEL FRAMEWORK CORE
// =============================================================================

$laravelCore = [
    // Contracts (interfaces - load first)
    $basePath . '/vendor/laravel/framework/src/Illuminate/Contracts',
    
    // Container (DI)
    $basePath . '/vendor/laravel/framework/src/Illuminate/Container',
    
    // Foundation
    $basePath . '/vendor/laravel/framework/src/Illuminate/Foundation',
    
    // Support (helpers, traits, collections)
    $basePath . '/vendor/laravel/framework/src/Illuminate/Support',
    $basePath . '/vendor/laravel/framework/src/Illuminate/Collections',
    $basePath . '/vendor/laravel/framework/src/Illuminate/Conditionable',
    $basePath . '/vendor/laravel/framework/src/Illuminate/Macroable',
    
    // HTTP Layer
    $basePath . '/vendor/laravel/framework/src/Illuminate/Http',
    $basePath . '/vendor/laravel/framework/src/Illuminate/Routing',
    $basePath . '/vendor/laravel/framework/src/Illuminate/Pipeline',
    
    // Database & Eloquent (critical for your app)
    $basePath . '/vendor/laravel/framework/src/Illuminate/Database',
    
    // Auth
    $basePath . '/vendor/laravel/framework/src/Illuminate/Auth',
    
    // Session & Cookie
    $basePath . '/vendor/laravel/framework/src/Illuminate/Session',
    $basePath . '/vendor/laravel/framework/src/Illuminate/Cookie',
    
    // Cache
    $basePath . '/vendor/laravel/framework/src/Illuminate/Cache',
    
    // Events
    $basePath . '/vendor/laravel/framework/src/Illuminate/Events',
    
    // Queue
    $basePath . '/vendor/laravel/framework/src/Illuminate/Queue',
    
    // Validation
    $basePath . '/vendor/laravel/framework/src/Illuminate/Validation',
    
    // Views & Blade
    $basePath . '/vendor/laravel/framework/src/Illuminate/View',
    
    // Mail
    $basePath . '/vendor/laravel/framework/src/Illuminate/Mail',
    $basePath . '/vendor/laravel/framework/src/Illuminate/Notifications',
    
    // Encryption & Hashing
    $basePath . '/vendor/laravel/framework/src/Illuminate/Encryption',
    $basePath . '/vendor/laravel/framework/src/Illuminate/Hashing',
    
    // Filesystem
    $basePath . '/vendor/laravel/framework/src/Illuminate/Filesystem',
    
    // Console
    $basePath . '/vendor/laravel/framework/src/Illuminate/Console',
    
    // Log
    $basePath . '/vendor/laravel/framework/src/Illuminate/Log',
    
    // Config
    $basePath . '/vendor/laravel/framework/src/Illuminate/Config',
    
    // Translation
    $basePath . '/vendor/laravel/framework/src/Illuminate/Translation',
    
    // Pagination
    $basePath . '/vendor/laravel/framework/src/Illuminate/Pagination',
    
    // Bus (Commands)
    $basePath . '/vendor/laravel/framework/src/Illuminate/Bus',
    
    // Process
    $basePath . '/vendor/laravel/framework/src/Illuminate/Process',
    
    // Concurrency
    $basePath . '/vendor/laravel/framework/src/Illuminate/Concurrency',
];

foreach ($laravelCore as $dir) {
    preloadDirectory($dir, $excludePatterns);
}

// =============================================================================
// PHASE 6: LARAVEL OCTANE (High Performance Server)
// =============================================================================

preloadDirectory($basePath . '/vendor/laravel/octane/src', $excludePatterns);

// =============================================================================
// PHASE 7: LARAVEL PASSPORT (API Authentication)
// =============================================================================

preloadDirectory($basePath . '/vendor/laravel/passport/src', $excludePatterns);
preloadDirectory($basePath . '/vendor/league/oauth2-server/src', $excludePatterns);
preloadDirectory($basePath . '/vendor/lcobucci/jwt/src', $excludePatterns);
preloadDirectory($basePath . '/vendor/lcobucci/clock/src', $excludePatterns);

// =============================================================================
// PHASE 8: LIVEWIRE 3
// =============================================================================

preloadDirectory($basePath . '/vendor/livewire/livewire/src', $excludePatterns);
preloadDirectory($basePath . '/vendor/livewire/volt/src', $excludePatterns);

// =============================================================================
// PHASE 9: FILAMENT 3 (Admin Panel)
// =============================================================================

$filamentPackages = [
    // Core
    $basePath . '/vendor/filament/filament/src',
    $basePath . '/vendor/filament/support/src',
    
    // Components
    $basePath . '/vendor/filament/forms/src',
    $basePath . '/vendor/filament/tables/src',
    $basePath . '/vendor/filament/actions/src',
    $basePath . '/vendor/filament/infolists/src',
    $basePath . '/vendor/filament/notifications/src',
    $basePath . '/vendor/filament/widgets/src',
    
    // Spatie integration
    $basePath . '/vendor/filament/spatie-laravel-media-library-plugin/src',
    $basePath . '/vendor/filament/spatie-laravel-settings-plugin/src',
    $basePath . '/vendor/filament/spatie-laravel-tags-plugin/src',
    $basePath . '/vendor/filament/spatie-laravel-translatable-plugin/src',
];

foreach ($filamentPackages as $dir) {
    preloadDirectory($dir, $excludePatterns);
}

// =============================================================================
// PHASE 10: BLADE ICONS (Multiple icon sets you're using)
// =============================================================================

$bladeIconPackages = [
    $basePath . '/vendor/blade-ui-kit/blade-icons/src',
    $basePath . '/vendor/blade-ui-kit/blade-heroicons/src',
    $basePath . '/vendor/andreiio/blade-remix-icon/src',
    $basePath . '/vendor/codeat3/blade-coolicons/src',
    $basePath . '/vendor/codeat3/blade-devicons/src',
    $basePath . '/vendor/codeat3/blade-file-icons/src',
    $basePath . '/vendor/codeat3/blade-vaadin-icons/src',
    $basePath . '/vendor/faisal50x/blade-ionicons/src',
    $basePath . '/vendor/postare/blade-mdi/src',
];

foreach ($bladeIconPackages as $dir) {
    preloadDirectory($dir, $excludePatterns);
}

// =============================================================================
// PHASE 11: SPATIE PACKAGES
// =============================================================================

$spatiePackages = [
    $basePath . '/vendor/spatie/laravel-cookie-consent/src',
    $basePath . '/vendor/spatie/laravel-query-builder/src',
    $basePath . '/vendor/spatie/laravel-package-tools/src',
];

foreach ($spatiePackages as $dir) {
    preloadDirectory($dir, $excludePatterns);
}

// =============================================================================
// PHASE 12: OTHER CRITICAL DEPENDENCIES
// =============================================================================

// Carbon (DateTime handling)
preloadDirectory($basePath . '/vendor/nesbot/carbon/src', $excludePatterns);

// Monolog (Logging)
preloadDirectory($basePath . '/vendor/monolog/monolog/src', $excludePatterns);

// Flysystem (File storage)
preloadDirectory($basePath . '/vendor/league/flysystem/src', $excludePatterns);
preloadDirectory($basePath . '/vendor/league/flysystem-local/src', $excludePatterns);

// Guzzle HTTP (API calls)
preloadDirectory($basePath . '/vendor/guzzlehttp/guzzle/src', $excludePatterns);
preloadDirectory($basePath . '/vendor/guzzlehttp/psr7/src', $excludePatterns);
preloadDirectory($basePath . '/vendor/guzzlehttp/promises/src', $excludePatterns);

// DomPDF (PDF generation)
preloadDirectory($basePath . '/vendor/barryvdh/laravel-dompdf/src', $excludePatterns);
preloadDirectory($basePath . '/vendor/dompdf/dompdf/src', $excludePatterns);

// QR Code
preloadDirectory($basePath . '/vendor/endroid/qr-code/src', $excludePatterns);

// Two Factor Auth
preloadFile($basePath . '/vendor/robthree/twofactorauth/lib/TwoFactorAuth.php');
preloadDirectory($basePath . '/vendor/robthree/twofactorauth/lib', $excludePatterns);

// Laravel Socialite (Social auth)
preloadDirectory($basePath . '/vendor/laravel/socialite/src', $excludePatterns);
preloadDirectory($basePath . '/vendor/socialiteproviders/discord/src', $excludePatterns);
preloadDirectory($basePath . '/vendor/socialiteproviders/manager/src', $excludePatterns);

// ApexCharts
preloadDirectory($basePath . '/vendor/akaunting/laravel-apexcharts/src', $excludePatterns);

// Laravel Trend
preloadDirectory($basePath . '/vendor/flowframe/laravel-trend/src', $excludePatterns);

// Laravel Themer
preloadDirectory($basePath . '/vendor/qirolab/laravel-themer/src', $excludePatterns);

// JSON API
preloadDirectory($basePath . '/vendor/timacdonald/json-api/src', $excludePatterns);

// Cookie Consent
preloadDirectory($basePath . '/vendor/whitecube/laravel-cookie-consent/src', $excludePatterns);

// Ramsey UUID
preloadDirectory($basePath . '/vendor/ramsey/uuid/src', $excludePatterns);
preloadDirectory($basePath . '/vendor/ramsey/collection/src', $excludePatterns);

// Doctrine (DBAL for migrations, Inflector for pluralization)
preloadDirectory($basePath . '/vendor/doctrine/inflector/lib', $excludePatterns);
preloadDirectory($basePath . '/vendor/doctrine/lexer/src', $excludePatterns);

// Vite manifest helper
preloadDirectory($basePath . '/vendor/laravel/framework/src/Illuminate/Foundation/Vite', $excludePatterns);

// =============================================================================
// PHASE 13: APPLICATION CODE (Your Code - Highest Priority)
// =============================================================================

// Models (most frequently accessed)
$modelFiles = [
    $basePath . '/app/Models/User.php',
    $basePath . '/app/Models/Service.php',
    $basePath . '/app/Models/Product.php',
    $basePath . '/app/Models/Invoice.php',
    $basePath . '/app/Models/InvoiceItem.php',
    $basePath . '/app/Models/InvoiceTransaction.php',
    $basePath . '/app/Models/Order.php',
    $basePath . '/app/Models/Ticket.php',
    $basePath . '/app/Models/TicketMessage.php',
    $basePath . '/app/Models/Gateway.php',
    $basePath . '/app/Models/Server.php',
    $basePath . '/app/Models/Category.php',
    $basePath . '/app/Models/Price.php',
    $basePath . '/app/Models/Plan.php',
    $basePath . '/app/Models/ConfigOption.php',
    $basePath . '/app/Models/Coupon.php',
    $basePath . '/app/Models/Property.php',
    $basePath . '/app/Models/Extension.php',
    $basePath . '/app/Models/Currency.php',
    $basePath . '/app/Models/Setting.php',
    $basePath . '/app/Models/Session.php',
    $basePath . '/app/Models/Role.php',
    $basePath . '/app/Models/ServiceConfig.php',
    $basePath . '/app/Models/ServiceCancellation.php',
    $basePath . '/app/Models/ServiceUpgrade.php',
    $basePath . '/app/Models/TaxRate.php',
    $basePath . '/app/Models/EmailTemplate.php',
    $basePath . '/app/Models/Credit.php',
    $basePath . '/app/Models/ApiKey.php',
    $basePath . '/app/Models/AuditLog.php',
];

preloadFiles($modelFiles);

// Preload remaining models
preloadDirectory($basePath . '/app/Models', $excludePatterns);

// Core application directories
$appDirectories = [
    // HTTP Layer
    $basePath . '/app/Http/Controllers',
    $basePath . '/app/Http/Middleware',
    $basePath . '/app/Http/Requests',
    
    // Livewire Components (critical for UI)
    $basePath . '/app/Livewire',
    
    // Filament Admin Panel
    $basePath . '/app/Admin/Resources',
    $basePath . '/app/Admin/Pages',
    $basePath . '/app/Admin/Widgets',
    $basePath . '/app/Admin/Components',
    $basePath . '/app/Admin/Actions',
    $basePath . '/app/Admin/Clusters',
    
    // Service Providers
    $basePath . '/app/Providers',
    
    // Background Jobs
    $basePath . '/app/Jobs',
    
    // Events & Listeners
    $basePath . '/app/Events',
    $basePath . '/app/Listeners',
    
    // Observers
    $basePath . '/app/Observers',
    
    // Policies
    $basePath . '/app/Policies',
    
    // Classes & Helpers
    $basePath . '/app/Classes',
    $basePath . '/app/Helpers',
    $basePath . '/app/Support',
    $basePath . '/app/Traits',
    
    // Validation Rules
    $basePath . '/app/Rules',
    
    // Mail
    $basePath . '/app/Mail',
    
    // View Components
    $basePath . '/app/View',
    
    // Attributes
    $basePath . '/app/Attributes',
    
    // Exceptions
    $basePath . '/app/Exceptions',
    
    // Console Commands
    $basePath . '/app/Console/Commands',
];

foreach ($appDirectories as $dir) {
    preloadDirectory($dir, $excludePatterns);
}

// =============================================================================
// PHASE 14: EXTENSIONS (Payment Gateways, Servers, etc.)
// =============================================================================

$extensionDirs = [
    $basePath . '/extensions/Gateways',
    $basePath . '/extensions/Servers',
    $basePath . '/extensions/Others',
];

foreach ($extensionDirs as $dir) {
    preloadDirectory($dir, $excludePatterns);
}

// =============================================================================
// PHASE 15: THEMES
// =============================================================================

preloadDirectory($basePath . '/themes/lucentui', $excludePatterns);

// =============================================================================
// PHASE 16: COMPILED BLADE VIEWS (Most Recent)
// =============================================================================

$compiledViewsPath = $basePath . '/storage/framework/views';
if (is_dir($compiledViewsPath)) {
    $viewFiles = glob($compiledViewsPath . '/*.php');
    if ($viewFiles) {
        // Sort by modification time, newest first
        usort($viewFiles, static fn($a, $b) => filemtime($b) <=> filemtime($a));
        // Preload top 500 most recently used views
        $viewFiles = array_slice($viewFiles, 0, 500);
        preloadFiles($viewFiles);
    }
}

// =============================================================================
// PHASE 17: CONFIG FILES
// =============================================================================

preloadDirectory($basePath . '/config', $excludePatterns);
preloadFile($basePath . '/bootstrap/app.php');
preloadFile($basePath . '/bootstrap/providers.php');

// =============================================================================
// PRELOAD SUMMARY & LOGGING
// =============================================================================

$stats['end_time'] = hrtime(true);
$stats['end_memory'] = memory_get_usage(true);

$duration = round(($stats['end_time'] - $stats['start_time']) / 1e6, 2); // ms
$memoryUsed = round(($stats['end_memory'] - $stats['start_memory']) / 1024 / 1024, 2); // MB
$totalMemory = round($stats['end_memory'] / 1024 / 1024, 2); // MB

$summary = sprintf(
    'OPcache Preload: %d files preloaded, %d skipped in %.2fms (Memory: %.2fMB used, %.2fMB total)',
    $stats['preloaded'],
    $stats['skipped'],
    $duration,
    $memoryUsed,
    $totalMemory
);

// Log summary
if (PHP_SAPI === 'cli') {
    echo $summary . PHP_EOL;
    
    if (!empty($stats['errors'])) {
        echo "Errors (" . count($stats['errors']) . "):\n";
        foreach (array_slice($stats['errors'], 0, 10) as $error) {
            echo "  - {$error}\n";
        }
        if (count($stats['errors']) > 10) {
            echo "  ... and " . (count($stats['errors']) - 10) . " more errors\n";
        }
    }
    
    // Show OPcache status
    if (function_exists('opcache_get_status')) {
        $status = opcache_get_status(false);
        if ($status) {
            echo sprintf(
                "OPcache Status: %d cached scripts, %.2fMB memory used, %.2f%% hit rate\n",
                $status['opcache_statistics']['num_cached_scripts'] ?? 0,
                ($status['memory_usage']['used_memory'] ?? 0) / 1024 / 1024,
                $status['opcache_statistics']['opcache_hit_rate'] ?? 0
            );
        }
    }
} else {
    error_log($summary);
}

// Force garbage collection to free memory
gc_collect_cycles();