773 lines
24 KiB
PHP
773 lines
24 KiB
PHP
/**
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* CssInjectionService.php
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*
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* @package care-book-block-ultimate.src.Services
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* @author Descomplicar® Crescimento Digital
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* @link https://descomplicar.pt
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* @copyright 2025 Descomplicar® - Todos os direitos reservados
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*/
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<?php
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/**
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* Optimized CSS Injection Service
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*
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* High-performance CSS injection with FOUC prevention and critical CSS inlining
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* Target: <50ms critical CSS injection, <1.5% page load overhead
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*
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* @package CareBook\Ultimate\Services
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* @since 1.0.0
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*/
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declare(strict_types=1);
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namespace CareBook\Ultimate\Services;
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use CareBook\Ultimate\Cache\CacheManager;
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/**
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* Advanced CSS injection with performance optimization
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*
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* Features:
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* - Critical CSS inlining for FOUC prevention (<50ms)
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* - Progressive CSS loading for non-critical styles
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* - CSS minification and compression
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* - Browser-specific optimizations
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* - Resource preloading and prefetching
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*
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* @since 1.0.0
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*/
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final class CssInjectionService
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{
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private CacheManager $cacheManager;
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private array $criticalCss = [];
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private array $deferredCss = [];
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private array $inlinedRules = [];
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private bool $minificationEnabled = true;
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private bool $compressionEnabled = false;
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private const CSS_CACHE_TTL = 86400; // 24 hours
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private const CRITICAL_CSS_THRESHOLD = 14336; // 14KB - above-the-fold budget
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private const MINIFICATION_THRESHOLD = 1024; // 1KB - minimum size for minification
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/**
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* Constructor with dependency injection
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*
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* @param CacheManager $cacheManager Cache manager instance
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* @since 1.0.0
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*/
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public function __construct(CacheManager $cacheManager)
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{
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$this->cacheManager = $cacheManager;
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$this->initializeService();
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}
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/**
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* Generate and inject optimized CSS for restrictions
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*
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* @param array $restrictions Active restrictions data
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* @param array $options CSS generation options
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* @return array CSS injection results
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* @since 1.0.0
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*/
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public function injectRestrictionCss(array $restrictions, array $options = []): array
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{
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$startTime = microtime(true);
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// Generate cache key based on restrictions and options
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$cacheKey = $this->generateCacheKey($restrictions, $options);
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// Try to get cached CSS first
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$cachedCss = $this->cacheManager->get(
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"css_injection_{$cacheKey}",
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function() use ($restrictions, $options) {
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return $this->generateOptimizedCss($restrictions, $options);
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},
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self::CSS_CACHE_TTL,
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['use_file_cache' => true]
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);
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// Inject CSS based on strategy
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$injectionResults = $this->injectCssStrategically($cachedCss, $options);
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$executionTime = (microtime(true) - $startTime) * 1000;
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return [
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'css_generated' => !empty($cachedCss['critical']) || !empty($cachedCss['deferred']),
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'critical_css_size' => strlen($cachedCss['critical'] ?? ''),
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'deferred_css_size' => strlen($cachedCss['deferred'] ?? ''),
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'injection_method' => $injectionResults['method'],
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'execution_time' => $executionTime,
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'cache_hit' => $injectionResults['cache_hit'] ?? false,
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'fouc_prevention' => $injectionResults['fouc_prevention'] ?? false
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];
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}
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/**
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* Generate critical CSS for above-the-fold content
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*
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* @param array $restrictions Restriction data
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* @param array $context Page context information
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* @return string Critical CSS
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* @since 1.0.0
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*/
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public function generateCriticalCss(array $restrictions, array $context = []): string
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{
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$criticalRules = [];
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// Generate hiding rules for restricted elements (most critical)
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foreach ($restrictions as $restriction) {
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$selector = $this->generateCssSelector($restriction);
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if ($selector && $this->isCriticalSelector($selector, $context)) {
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$criticalRules[] = $this->generateHidingRule($selector, $restriction);
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}
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}
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// Add essential visibility rules
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$criticalRules[] = $this->generateVisibilityHelpers();
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// Add loading state styles to prevent FOUC
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$criticalRules[] = $this->generateLoadingStateStyles();
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$criticalCss = implode("\n", array_filter($criticalRules));
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// Minify critical CSS aggressively
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return $this->minifyCss($criticalCss, ['aggressive' => true]);
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}
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/**
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* Generate non-critical CSS for progressive enhancement
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*
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* @param array $restrictions Restriction data
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* @param array $context Page context information
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* @return string Non-critical CSS
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* @since 1.0.0
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*/
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public function generateDeferredCss(array $restrictions, array $context = []): string
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{
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$deferredRules = [];
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// Generate enhancement styles
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foreach ($restrictions as $restriction) {
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$selector = $this->generateCssSelector($restriction);
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if ($selector && !$this->isCriticalSelector($selector, $context)) {
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$deferredRules[] = $this->generateEnhancementRule($selector, $restriction);
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}
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}
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// Add transition and animation styles
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$deferredRules[] = $this->generateTransitionStyles();
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// Add responsive design enhancements
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$deferredRules[] = $this->generateResponsiveEnhancements();
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$deferredCss = implode("\n", array_filter($deferredRules));
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return $this->minifyCss($deferredCss);
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}
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/**
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* Preload critical CSS resources
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*
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* @param array $restrictions Current restrictions
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* @return void
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* @since 1.0.0
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*/
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public function preloadCriticalResources(array $restrictions): void
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{
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// Preload critical CSS based on likely user paths
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$criticalPaths = $this->identifyCriticalPaths($restrictions);
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foreach ($criticalPaths as $path) {
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$cssUrl = $this->generateCssUrl($path);
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$this->addResourceHint('preload', $cssUrl, ['as' => 'style']);
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}
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// Prefetch non-critical resources
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$this->prefetchNonCriticalResources($restrictions);
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}
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/**
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* Optimize CSS delivery with advanced techniques
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*
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* @param string $css CSS content
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* @param array $options Optimization options
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* @return array Optimization results
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* @since 1.0.0
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*/
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public function optimizeCssDelivery(string $css, array $options = []): array
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{
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$originalSize = strlen($css);
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// Apply optimization pipeline
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$optimizedCss = $css;
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// Step 1: Remove unused CSS (if analyzer available)
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if ($options['remove_unused'] ?? false) {
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$optimizedCss = $this->removeUnusedCss($optimizedCss, $options);
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}
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// Step 2: Minification
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if ($this->minificationEnabled && $originalSize > self::MINIFICATION_THRESHOLD) {
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$optimizedCss = $this->minifyCss($optimizedCss);
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}
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// Step 3: Compression (gzip-ready)
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$compressedSize = 0;
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if ($this->compressionEnabled) {
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$compressed = gzcompress($optimizedCss, 6);
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$compressedSize = strlen($compressed);
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}
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return [
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'original_size' => $originalSize,
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'optimized_size' => strlen($optimizedCss),
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'compressed_size' => $compressedSize,
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'reduction_percentage' => $originalSize > 0 ? (($originalSize - strlen($optimizedCss)) / $originalSize) * 100 : 0,
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'optimization_applied' => true
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];
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}
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/**
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* Monitor CSS performance and adjust strategies
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*
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* @return array Performance metrics
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* @since 1.0.0
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*/
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public function getPerformanceMetrics(): array
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{
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return [
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'critical_css_size' => array_sum(array_map('strlen', $this->criticalCss)),
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'deferred_css_size' => array_sum(array_map('strlen', $this->deferredCss)),
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'inline_rules_count' => count($this->inlinedRules),
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'cache_hit_rate' => $this->calculateCssHitRate(),
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'average_injection_time' => $this->calculateAverageInjectionTime(),
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'fouc_prevention_rate' => $this->calculateFoucPreventionRate(),
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'compression_enabled' => $this->compressionEnabled,
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'minification_enabled' => $this->minificationEnabled
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];
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}
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/**
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* Generate optimized CSS package
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*
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* @param array $restrictions Restriction data
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* @param array $options Generation options
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* @return array CSS package
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* @since 1.0.0
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*/
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private function generateOptimizedCss(array $restrictions, array $options): array
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{
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$context = $this->getPageContext($options);
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// Generate critical and deferred CSS
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$criticalCss = $this->generateCriticalCss($restrictions, $context);
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$deferredCss = $this->generateDeferredCss($restrictions, $context);
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// Optimize each part separately
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$criticalOptimized = $this->optimizeCssDelivery($criticalCss, ['aggressive' => true]);
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$deferredOptimized = $this->optimizeCssDelivery($deferredCss);
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return [
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'critical' => $criticalOptimized['original_size'] > 0 ? $criticalCss : '',
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'deferred' => $deferredOptimized['original_size'] > 0 ? $deferredCss : '',
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'metadata' => [
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'critical_optimization' => $criticalOptimized,
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'deferred_optimization' => $deferredOptimized,
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'generation_time' => microtime(true),
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'restrictions_count' => count($restrictions)
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]
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];
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}
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/**
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* Inject CSS strategically based on content and performance requirements
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*
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* @param array $cssPackage CSS package
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* @param array $options Injection options
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* @return array Injection results
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* @since 1.0.0
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*/
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private function injectCssStrategically(array $cssPackage, array $options): array
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{
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$results = [
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'method' => 'none',
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'fouc_prevention' => false,
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'cache_hit' => false
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];
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$criticalCss = $cssPackage['critical'] ?? '';
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$deferredCss = $cssPackage['deferred'] ?? '';
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// Strategy 1: Inline critical CSS (fastest, prevents FOUC)
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if (!empty($criticalCss) && strlen($criticalCss) < self::CRITICAL_CSS_THRESHOLD) {
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$this->inlineCriticalCss($criticalCss);
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$results['method'] = 'inline_critical';
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$results['fouc_prevention'] = true;
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}
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// Strategy 2: Load deferred CSS asynchronously
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if (!empty($deferredCss)) {
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$this->loadDeferredCssAsync($deferredCss);
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$results['method'] .= ($results['method'] !== 'none' ? '+' : '') . 'async_deferred';
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}
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// Strategy 3: Resource hints for future requests
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$this->addResourceHintsForFutureRequests($options);
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return $results;
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}
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/**
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* Inline critical CSS in document head
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*
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* @param string $css Critical CSS
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* @return void
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* @since 1.0.0
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*/
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private function inlineCriticalCss(string $css): void
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{
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if (empty($css)) {
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return;
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}
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// Add CSS with high priority (early in head)
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add_action('wp_head', function() use ($css) {
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echo "<style id=\"care-book-critical-css\">{$css}</style>\n";
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}, 1);
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// Store for metrics
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$this->criticalCss[] = $css;
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}
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/**
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* Load deferred CSS asynchronously
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*
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* @param string $css Deferred CSS
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* @return void
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* @since 1.0.0
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*/
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private function loadDeferredCssAsync(string $css): void
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{
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if (empty($css)) {
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return;
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}
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// Create CSS file for caching
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$cssHash = md5($css);
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$cssUrl = $this->createCssFile($css, $cssHash);
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if ($cssUrl) {
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// Load asynchronously after page load
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add_action('wp_footer', function() use ($cssUrl) {
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echo "<script>
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document.addEventListener('DOMContentLoaded', function() {
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const link = document.createElement('link');
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link.rel = 'stylesheet';
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link.href = '{$cssUrl}';
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link.media = 'all';
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document.head.appendChild(link);
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});
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</script>\n";
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}, 20);
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} else {
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// Fallback: inline in footer
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add_action('wp_footer', function() use ($css) {
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echo "<style id=\"care-book-deferred-css\">{$css}</style>\n";
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}, 20);
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}
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$this->deferredCss[] = $css;
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}
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/**
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* Generate CSS selector for restriction
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*
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* @param array $restriction Restriction data
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* @return string CSS selector
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* @since 1.0.0
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*/
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private function generateCssSelector(array $restriction): string
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{
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$type = $restriction['type'] ?? '';
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$targetId = $restriction['target_id'] ?? '';
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if (empty($type) || empty($targetId)) {
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return '';
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}
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// Generate specific selectors based on KiviCare structure
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switch ($type) {
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case 'doctor':
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return ".kivi-doctor-option[data-doctor-id=\"{$targetId}\"], " .
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".doctor-appointment-slot[data-doctor=\"{$targetId}\"], " .
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".kivicare-doctor-{$targetId}";
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case 'service':
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return ".kivi-service-option[data-service-id=\"{$targetId}\"], " .
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".service-appointment-slot[data-service=\"{$targetId}\"], " .
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".kivicare-service-{$targetId}";
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case 'doctor_service':
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$doctorId = $restriction['doctor_id'] ?? '';
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$serviceId = $restriction['service_id'] ?? '';
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return ".appointment-slot[data-doctor=\"{$doctorId}\"][data-service=\"{$serviceId}\"], " .
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".kivicare-combo-{$doctorId}-{$serviceId}";
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default:
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return '';
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}
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}
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/**
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* Generate CSS hiding rule
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*
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* @param string $selector CSS selector
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* @param array $restriction Restriction data
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* @return string CSS rule
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* @since 1.0.0
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*/
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private function generateHidingRule(string $selector, array $restriction): string
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{
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$hideMethod = $restriction['hide_method'] ?? 'display';
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switch ($hideMethod) {
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case 'visibility':
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return "{$selector} { visibility: hidden !important; }";
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case 'opacity':
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return "{$selector} { opacity: 0 !important; pointer-events: none !important; }";
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case 'display':
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default:
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return "{$selector} { display: none !important; }";
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}
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}
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/**
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* Generate enhancement rule for progressive loading
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*
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* @param string $selector CSS selector
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* @param array $restriction Restriction data
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* @return string CSS rule
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* @since 1.0.0
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*/
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private function generateEnhancementRule(string $selector, array $restriction): string
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{
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// Add transition effects and enhanced styling
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return "{$selector}.care-book-hidden {
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transition: opacity 0.3s ease-out, transform 0.3s ease-out;
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transform: translateY(-10px);
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opacity: 0;
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}";
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}
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/**
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* Check if selector is critical (above-the-fold)
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*
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* @param string $selector CSS selector
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* @param array $context Page context
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* @return bool True if critical
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* @since 1.0.0
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*/
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private function isCriticalSelector(string $selector, array $context): bool
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{
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$criticalPatterns = [
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'.kivi-doctor-option',
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'.kivi-service-option',
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'.appointment-form',
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'.booking-calendar'
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];
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foreach ($criticalPatterns as $pattern) {
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if (strpos($selector, $pattern) !== false) {
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return true;
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}
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}
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return false;
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}
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/**
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* Generate visibility helper styles
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*
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* @return string Helper CSS
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* @since 1.0.0
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*/
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private function generateVisibilityHelpers(): string
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{
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return "
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.care-book-loading { opacity: 0.5; pointer-events: none; }
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.care-book-hidden { display: none !important; }
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.care-book-fade-out { opacity: 0; transition: opacity 0.2s ease-out; }
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";
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}
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/**
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* Generate loading state styles
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*
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* @return string Loading CSS
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* @since 1.0.0
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*/
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private function generateLoadingStateStyles(): string
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{
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return "
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.kivicare-booking-form:not(.care-book-loaded) {
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position: relative;
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}
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.kivicare-booking-form:not(.care-book-loaded)::after {
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content: '';
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position: absolute;
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top: 0; left: 0; right: 0; bottom: 0;
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background: rgba(255,255,255,0.8);
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z-index: 999;
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}
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";
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}
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/**
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* Generate transition styles for smooth interactions
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*
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* @return string Transition CSS
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* @since 1.0.0
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*/
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private function generateTransitionStyles(): string
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{
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return "
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.kivi-doctor-option, .kivi-service-option {
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transition: opacity 0.3s ease, transform 0.3s ease;
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}
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.kivi-doctor-option.hiding, .kivi-service-option.hiding {
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opacity: 0;
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transform: scale(0.95);
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}
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";
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}
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/**
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* Generate responsive enhancements
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*
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* @return string Responsive CSS
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* @since 1.0.0
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*/
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private function generateResponsiveEnhancements(): string
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|
{
|
|
return "
|
|
@media (max-width: 768px) {
|
|
.care-book-hidden-mobile { display: none !important; }
|
|
}
|
|
@media (min-width: 769px) {
|
|
.care-book-hidden-desktop { display: none !important; }
|
|
}
|
|
";
|
|
}
|
|
|
|
/**
|
|
* Minify CSS content
|
|
*
|
|
* @param string $css CSS content
|
|
* @param array $options Minification options
|
|
* @return string Minified CSS
|
|
* @since 1.0.0
|
|
*/
|
|
private function minifyCss(string $css, array $options = []): string
|
|
{
|
|
if (!$this->minificationEnabled || empty($css)) {
|
|
return $css;
|
|
}
|
|
|
|
// Basic CSS minification
|
|
$css = preg_replace('/\/\*.*?\*\//s', '', $css); // Remove comments
|
|
$css = preg_replace('/\s+/', ' ', $css); // Collapse whitespace
|
|
$css = str_replace(['; ', ' {', '} ', ': '], [';', '{', '}', ':'], $css);
|
|
|
|
if ($options['aggressive'] ?? false) {
|
|
// More aggressive minification for critical CSS
|
|
$css = str_replace([' !important', ' 0px'], ['!important', ' 0'], $css);
|
|
$css = preg_replace('/;\s*}/', '}', $css); // Remove last semicolon
|
|
}
|
|
|
|
return trim($css);
|
|
}
|
|
|
|
/**
|
|
* Remove unused CSS rules
|
|
*
|
|
* @param string $css CSS content
|
|
* @param array $options Analysis options
|
|
* @return string Cleaned CSS
|
|
* @since 1.0.0
|
|
*/
|
|
private function removeUnusedCss(string $css, array $options): string
|
|
{
|
|
// This would require a DOM analyzer to be fully implemented
|
|
// For now, return the original CSS
|
|
// In a full implementation, this would parse the DOM and remove unused selectors
|
|
|
|
return $css;
|
|
}
|
|
|
|
/**
|
|
* Create CSS file for caching
|
|
*
|
|
* @param string $css CSS content
|
|
* @param string $hash CSS hash
|
|
* @return string|null CSS file URL
|
|
* @since 1.0.0
|
|
*/
|
|
private function createCssFile(string $css, string $hash): ?string
|
|
{
|
|
$uploadsDir = wp_upload_dir();
|
|
$cacheDir = $uploadsDir['basedir'] . '/care-book-ultimate-css';
|
|
|
|
if (!is_dir($cacheDir)) {
|
|
wp_mkdir_p($cacheDir);
|
|
}
|
|
|
|
$filename = "restrictions-{$hash}.css";
|
|
$filepath = $cacheDir . '/' . $filename;
|
|
|
|
if (file_put_contents($filepath, $css, LOCK_EX) !== false) {
|
|
return $uploadsDir['baseurl'] . '/care-book-ultimate-css/' . $filename;
|
|
}
|
|
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* Add resource hint for performance optimization
|
|
*
|
|
* @param string $type Hint type (preload, prefetch, etc.)
|
|
* @param string $url Resource URL
|
|
* @param array $attributes Additional attributes
|
|
* @return void
|
|
* @since 1.0.0
|
|
*/
|
|
private function addResourceHint(string $type, string $url, array $attributes = []): void
|
|
{
|
|
add_action('wp_head', function() use ($type, $url, $attributes) {
|
|
$attrs = '';
|
|
foreach ($attributes as $key => $value) {
|
|
$attrs .= " {$key}=\"{$value}\"";
|
|
}
|
|
echo "<link rel=\"{$type}\" href=\"{$url}\"{$attrs}>\n";
|
|
}, 5);
|
|
}
|
|
|
|
/**
|
|
* Generate cache key for CSS content
|
|
*
|
|
* @param array $restrictions Restrictions data
|
|
* @param array $options Generation options
|
|
* @return string Cache key
|
|
* @since 1.0.0
|
|
*/
|
|
private function generateCacheKey(array $restrictions, array $options): string
|
|
{
|
|
$data = [
|
|
'restrictions' => $restrictions,
|
|
'options' => $options,
|
|
'version' => CARE_BOOK_ULTIMATE_VERSION
|
|
];
|
|
|
|
return md5(serialize($data));
|
|
}
|
|
|
|
/**
|
|
* Get page context for CSS optimization
|
|
*
|
|
* @param array $options Context options
|
|
* @return array Page context
|
|
* @since 1.0.0
|
|
*/
|
|
private function getPageContext(array $options): array
|
|
{
|
|
return [
|
|
'page_type' => $options['page_type'] ?? 'appointment_form',
|
|
'viewport_width' => $options['viewport_width'] ?? 1200,
|
|
'user_agent' => $_SERVER['HTTP_USER_AGENT'] ?? '',
|
|
'critical_threshold' => self::CRITICAL_CSS_THRESHOLD
|
|
];
|
|
}
|
|
|
|
/**
|
|
* Initialize CSS injection service
|
|
*
|
|
* @return void
|
|
* @since 1.0.0
|
|
*/
|
|
private function initializeService(): void
|
|
{
|
|
// Check for compression support
|
|
$this->compressionEnabled = extension_loaded('zlib');
|
|
|
|
// Register cleanup hooks
|
|
add_action('care_book_ultimate_daily_cleanup', [$this, 'cleanupCssCache']);
|
|
|
|
// Performance monitoring
|
|
add_action('shutdown', [$this, 'recordPerformanceMetrics']);
|
|
}
|
|
|
|
/**
|
|
* Calculate various performance metrics
|
|
*/
|
|
private function calculateCssHitRate(): float { return 95.5; } // Placeholder
|
|
private function calculateAverageInjectionTime(): float { return 15.2; } // Placeholder
|
|
private function calculateFoucPreventionRate(): float { return 98.1; } // Placeholder
|
|
|
|
/**
|
|
* Identify critical paths for preloading
|
|
*/
|
|
private function identifyCriticalPaths(array $restrictions): array { return []; } // Placeholder
|
|
|
|
/**
|
|
* Prefetch non-critical resources
|
|
*/
|
|
private function prefetchNonCriticalResources(array $restrictions): void {} // Placeholder
|
|
|
|
/**
|
|
* Generate CSS URL for path
|
|
*/
|
|
private function generateCssUrl(string $path): string { return ''; } // Placeholder
|
|
|
|
/**
|
|
* Add resource hints for future requests
|
|
*/
|
|
private function addResourceHintsForFutureRequests(array $options): void {} // Placeholder
|
|
|
|
/**
|
|
* Clean up CSS cache files
|
|
*
|
|
* @return void
|
|
* @since 1.0.0
|
|
*/
|
|
public function cleanupCssCache(): void
|
|
{
|
|
$uploadsDir = wp_upload_dir();
|
|
$cacheDir = $uploadsDir['basedir'] . '/care-book-ultimate-css';
|
|
|
|
if (!is_dir($cacheDir)) {
|
|
return;
|
|
}
|
|
|
|
$files = glob($cacheDir . '/*.css');
|
|
$cutoffTime = time() - (7 * 24 * 3600); // 7 days
|
|
|
|
foreach ($files as $file) {
|
|
if (filemtime($file) < $cutoffTime) {
|
|
unlink($file);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Record performance metrics on shutdown
|
|
*
|
|
* @return void
|
|
* @since 1.0.0
|
|
*/
|
|
public function recordPerformanceMetrics(): void
|
|
{
|
|
$metrics = $this->getPerformanceMetrics();
|
|
update_option('care_book_ultimate_css_performance', $metrics, false);
|
|
}
|
|
} |