<?php

/**
 * OPcache Preload Script for PHP 8.3-FPM
 * 
 * Configure in php.ini:
 *   opcache.preload=/path/to/preload.php
 *   opcache.preload_user=www-data
 * 
 * Run after deployment: php artisan optimize && php artisan filament:optimize
 */

declare(strict_types=1);

$basePath = __DIR__;
$preloadedCount = 0;
$skippedCount = 0;

/**
 * Compile a file into OPcache without executing it
 */
function preloadFile(string $path): bool
{
    global $preloadedCount, $skippedCount;
    
    if (!is_file($path) || !is_readable($path)) {
        return false;
    }

    try {
        if (opcache_compile_file($path)) {
            $preloadedCount++;
            return true;
        }
    } catch (Throwable $e) {
        // Silently skip files that can't be preloaded (syntax errors, etc.)
    }
    
    $skippedCount++;
    return false;
}

/**
 * Recursively preload all PHP files in a directory
 */
function preloadDirectory(string $dir, array $excludePatterns = []): void
{
    if (!is_dir($dir)) {
        return;
    }

    $iterator = new RecursiveIteratorIterator(
        new RecursiveDirectoryIterator($dir, FilesystemIterator::SKIP_DOTS),
        RecursiveIteratorIterator::LEAVES_ONLY
    );

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

        $path = $file->getRealPath();
        
        // Skip excluded patterns
        foreach ($excludePatterns as $pattern) {
            if (preg_match($pattern, $path)) {
                continue 2;
            }
        }

        preloadFile($path);
    }
}

/**
 * Preload specific files from a list
 */
function preloadFiles(array $files): void
{
    foreach ($files as $file) {
        if (is_file($file)) {
            preloadFile($file);
        }
    }
}

// =============================================================================
// 1. LARAVEL CACHED/COMPILED FILES (Most Critical)
// =============================================================================

$cachedFiles = [
    $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',
    $basePath . '/bootstrap/cache/filament.php',
    $basePath . '/bootstrap/cache/livewire-components.php',
];

preloadFiles($cachedFiles);

// =============================================================================
// 2. COMPOSER AUTOLOADER (Essential for class resolution)
// =============================================================================

preloadFiles([
    $basePath . '/vendor/autoload.php',
    $basePath . '/vendor/composer/autoload_real.php',
    $basePath . '/vendor/composer/ClassLoader.php',
    $basePath . '/vendor/composer/autoload_static.php',
]);

// =============================================================================
// 3. LARAVEL CORE FRAMEWORK
// =============================================================================

$laravelCoreDirs = [
    // Foundation & Core
    $basePath . '/vendor/laravel/framework/src/Illuminate/Foundation',
    $basePath . '/vendor/laravel/framework/src/Illuminate/Container',
    $basePath . '/vendor/laravel/framework/src/Illuminate/Contracts',
    
    // 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
    $basePath . '/vendor/laravel/framework/src/Illuminate/Database',
    
    // Support utilities
    $basePath . '/vendor/laravel/framework/src/Illuminate/Support',
    $basePath . '/vendor/laravel/framework/src/Illuminate/Collections',
    
    // Session & Auth
    $basePath . '/vendor/laravel/framework/src/Illuminate/Auth',
    $basePath . '/vendor/laravel/framework/src/Illuminate/Session',
    $basePath . '/vendor/laravel/framework/src/Illuminate/Cookie',
    
    // Views & Blade
    $basePath . '/vendor/laravel/framework/src/Illuminate/View',
    
    // Events & Queue
    $basePath . '/vendor/laravel/framework/src/Illuminate/Events',
    $basePath . '/vendor/laravel/framework/src/Illuminate/Queue',
    
    // Validation & Cache
    $basePath . '/vendor/laravel/framework/src/Illuminate/Validation',
    $basePath . '/vendor/laravel/framework/src/Illuminate/Cache',
    
    // Encryption & Hashing
    $basePath . '/vendor/laravel/framework/src/Illuminate/Encryption',
    $basePath . '/vendor/laravel/framework/src/Illuminate/Hashing',
];

// Exclude test files and stubs
$excludePatterns = [
    '/[Tt]est[s]?\.php$/',
    '/[Ss]tub[s]?\.php$/',
    '/[Ff]ixture[s]?/',
];

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

// =============================================================================
// 4. LIVEWIRE (Critical for your app)
// =============================================================================

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

// =============================================================================
// 5. FILAMENT (Admin Panel - Critical for your app)
// =============================================================================

$filamentDirs = [
    $basePath . '/vendor/filament/filament/src',
    $basePath . '/vendor/filament/support/src',
    $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',
];

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

// =============================================================================
// 6. COMMON DEPENDENCIES
// =============================================================================

$commonDeps = [
    // Symfony HTTP Foundation
    $basePath . '/vendor/symfony/http-foundation/Request.php',
    $basePath . '/vendor/symfony/http-foundation/Response.php',
    $basePath . '/vendor/symfony/http-foundation/HeaderBag.php',
    $basePath . '/vendor/symfony/http-foundation/ParameterBag.php',
    $basePath . '/vendor/symfony/http-foundation/InputBag.php',
    $basePath . '/vendor/symfony/http-foundation/FileBag.php',
    $basePath . '/vendor/symfony/http-foundation/ServerBag.php',
    $basePath . '/vendor/symfony/http-foundation/Cookie.php',
    $basePath . '/vendor/symfony/http-foundation/Session/Session.php',
    
    // Symfony HTTP Kernel
    $basePath . '/vendor/symfony/http-kernel/HttpKernel.php',
    
    // PSR Interfaces
    $basePath . '/vendor/psr/container/src/ContainerInterface.php',
    $basePath . '/vendor/psr/http-message/src/MessageInterface.php',
    $basePath . '/vendor/psr/http-message/src/RequestInterface.php',
    $basePath . '/vendor/psr/http-message/src/ResponseInterface.php',
    $basePath . '/vendor/psr/log/src/LoggerInterface.php',
    
    // Carbon (Date handling)
    $basePath . '/vendor/nesbot/carbon/src/Carbon/Carbon.php',
    $basePath . '/vendor/nesbot/carbon/src/Carbon/CarbonInterface.php',
    $basePath . '/vendor/nesbot/carbon/src/Carbon/CarbonImmutable.php',
];

preloadFiles($commonDeps);

// =============================================================================
// 7. APPLICATION CODE (Your code)
// =============================================================================

$appDirs = [
    // Models (Most frequently accessed)
    $basePath . '/app/Models',
    
    // HTTP Layer
    $basePath . '/app/Http/Controllers',
    $basePath . '/app/Http/Middleware',
    $basePath . '/app/Http/Requests',
    
    // Livewire Components
    $basePath . '/app/Livewire',
    
    // Filament Admin
    $basePath . '/app/Admin/Resources',
    $basePath . '/app/Admin/Pages',
    $basePath . '/app/Admin/Widgets',
    
    // Service Providers
    $basePath . '/app/Providers',
    
    // Jobs & Events
    $basePath . '/app/Jobs',
    $basePath . '/app/Events',
    $basePath . '/app/Listeners',
    
    // Helpers & Classes
    $basePath . '/app/Classes',
    $basePath . '/app/Helpers',
    $basePath . '/app/Traits',
    
    // Policies & Rules
    $basePath . '/app/Policies',
    $basePath . '/app/Rules',
];

foreach ($appDirs as $dir) {
    preloadDirectory($dir);
}

// =============================================================================
// 8. BLADE COMPILED VIEWS (if using view caching)
// =============================================================================

// Only preload if compiled views exist and are recent
$compiledViewsPath = $basePath . '/storage/framework/views';
if (is_dir($compiledViewsPath)) {
    // Limit to most recently modified compiled views (top 200)
    $viewFiles = glob($compiledViewsPath . '/*.php');
    if ($viewFiles) {
        // Sort by modification time, newest first
        usort($viewFiles, fn($a, $b) => filemtime($b) - filemtime($a));
        $viewFiles = array_slice($viewFiles, 0, 200);
        preloadFiles($viewFiles);
    }
}

// =============================================================================
// SUMMARY (logged to error_log for debugging)
// =============================================================================

if (php_sapi_name() === 'cli') {
    echo "OPcache Preload Complete: {$preloadedCount} files preloaded, {$skippedCount} skipped\n";
    echo "Memory usage: " . round(memory_get_usage(true) / 1024 / 1024, 2) . " MB\n";
} else {
    error_log("OPcache Preload: {$preloadedCount} files preloaded, {$skippedCount} skipped");
}