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<?php |
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/** |
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* AI Metadata Generator |
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* |
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* Core functionality for generating SEO metadata using AI |
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* |
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* @package ThinkRank\AI |
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* @since 1.0.0 |
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*/ |
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|
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declare(strict_types=1); |
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|
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namespace ThinkRank\AI; |
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|
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use ThinkRank\Core\Settings; |
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|
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// Prevent direct access |
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if (!defined('ABSPATH')) { |
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exit; |
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} |
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|
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/** |
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* Metadata Generator Class |
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* |
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* Single Responsibility: Generate SEO metadata using AI |
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* |
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* @since 1.0.0 |
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*/ |
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class Metadata_Generator { |
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|
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/** |
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* AI Manager instance |
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* |
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* @var Manager |
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*/ |
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private Manager $ai_manager; |
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|
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/** |
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* Settings instance |
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* |
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* @var Settings |
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*/ |
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private Settings $settings; |
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|
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/** |
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* Constructor |
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* |
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* @param Manager|null $ai_manager AI manager instance |
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* @param Settings|null $settings Settings instance |
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*/ |
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public function __construct(?Manager $ai_manager = null, ?Settings $settings = null) { |
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$this->ai_manager = $ai_manager ?? new Manager(); |
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$this->settings = $settings ?? new Settings(); |
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} |
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|
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/** |
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* Generate metadata for post content |
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* |
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* @param string $content Post content |
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* @param array $options Generation options |
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* @return array Generated metadata |
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* @throws \Exception If generation fails |
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*/ |
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public function generate_for_content(string $content, array $options = []): array { |
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// Validate content |
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if (empty(trim($content))) { |
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throw new \Exception('Content cannot be empty'); |
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} |
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|
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// Prepare content for AI processing |
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$processed_content = $this->prepare_content($content); |
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|
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// Set default options |
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$default_options = [ |
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'target_keyword' => '', |
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'content_type' => 'blog_post', |
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'tone' => 'professional', |
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'max_title_length' => $this->settings->get('meta_title_length', 60), |
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'max_description_length' => $this->settings->get('meta_description_length', 160), |
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]; |
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|
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$options = array_merge($default_options, $options); |
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|
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// Generate metadata using AI |
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$metadata = $this->ai_manager->generate_seo_metadata($processed_content, $options); |
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|
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// Post-process and validate metadata |
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return $this->validate_and_enhance_metadata($metadata, $options); |
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} |
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|
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/** |
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* Generate metadata for WordPress post |
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* |
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* @param int $post_id Post ID |
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* @param array $options Generation options |
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* @return array Generated metadata |
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* @throws \Exception If generation fails |
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*/ |
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public function generate_for_post(int $post_id, array $options = []): array { |
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$post = get_post($post_id); |
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|
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if (!$post) { |
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throw new \Exception('Post not found'); |
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} |
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|
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// Extract content from post |
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$content = $this->extract_post_content($post); |
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|
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// Add post-specific options |
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$options = array_merge($options, [ |
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'content_type' => $this->determine_content_type($post), |
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'post_id' => $post_id, |
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]); |
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|
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// Generate metadata |
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$metadata = $this->generate_for_content($content, $options); |
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|
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// Save metadata to post meta |
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$this->save_post_metadata($post_id, $metadata); |
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|
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return $metadata; |
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} |
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|
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/** |
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* Generate multiple variations of metadata |
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* |
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* @param string $content Content to analyze |
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* @param array $options Generation options |
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* @param int $variations Number of variations to generate |
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* @return array Array of metadata variations |
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*/ |
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public function generate_variations(string $content, array $options = [], int $variations = 3): array { |
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$results = []; |
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|
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for ($i = 0; $i < $variations; $i++) { |
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// Slightly vary the temperature for different results |
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$variation_options = array_merge($options, [ |
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'temperature' => 0.3 + ($i * 0.2), // 0.3, 0.5, 0.7 |
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'variation' => $i + 1, |
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]); |
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|
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try { |
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$metadata = $this->generate_for_content($content, $variation_options); |
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$metadata['variation_id'] = $i + 1; |
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$results[] = $metadata; |
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|
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// Small delay to avoid rate limiting |
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if ($i < $variations - 1) { |
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sleep(1); |
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} |
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|
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} catch (\Exception $e) { |
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// Skip failed variations silently |
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} |
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} |
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|
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return $results; |
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} |
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|
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/** |
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* Analyze content and suggest improvements |
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* |
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* @param string $content Content to analyze |
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* @param array $current_metadata Current metadata |
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* @return array Analysis and suggestions |
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*/ |
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public function analyze_content(string $content, array $current_metadata = []): array { |
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$analysis = [ |
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'content_length' => str_word_count($content), |
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'readability_score' => $this->calculate_readability_score($content), |
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'keyword_density' => $this->analyze_keyword_density($content), |
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'suggestions' => [], |
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]; |
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|
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// Analyze current metadata if provided |
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if (!empty($current_metadata)) { |
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$analysis['metadata_analysis'] = $this->analyze_metadata($current_metadata); |
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} |
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|
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// Generate improvement suggestions |
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$analysis['suggestions'] = $this->generate_improvement_suggestions($analysis); |
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|
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return $analysis; |
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} |
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|
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/** |
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* Prepare content for AI processing |
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* |
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* @param string $content Raw content |
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* @return string Processed content |
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*/ |
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private function prepare_content(string $content): string { |
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// Remove HTML tags |
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$content = wp_strip_all_tags($content); |
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|
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// Remove shortcodes |
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$content = strip_shortcodes($content); |
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|
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// Normalize whitespace |
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$content = preg_replace('/\s+/', ' ', $content); |
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|
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// Trim and limit length for AI processing |
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$content = trim($content); |
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$max_length = 4000; // Reasonable limit for AI processing |
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|
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if (strlen($content) > $max_length) { |
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$content = substr($content, 0, $max_length) . '...'; |
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} |
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|
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return $content; |
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} |
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|
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/** |
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* Extract content from WordPress post |
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* |
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* @param \WP_Post $post Post object |
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* @return string Extracted content |
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*/ |
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private function extract_post_content(\WP_Post $post): string { |
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$content = $post->post_title . "\n\n" . $post->post_content; |
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|
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// Add excerpt if available |
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if (!empty($post->post_excerpt)) { |
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$content = $post->post_title . "\n\n" . $post->post_excerpt . "\n\n" . $post->post_content; |
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} |
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|
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return $content; |
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} |
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|
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/** |
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* Determine content type from post |
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* |
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* @param \WP_Post $post Post object |
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* @return string Content type |
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*/ |
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private function determine_content_type(\WP_Post $post): string { |
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switch ($post->post_type) { |
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case 'page': |
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return 'page'; |
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case 'product': |
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return 'product'; |
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case 'post': |
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default: |
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return 'blog_post'; |
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} |
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} |
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|
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/** |
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* Validate and enhance generated metadata |
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* |
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* @param array $metadata Generated metadata |
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* @param array $options Generation options |
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* @return array Enhanced metadata |
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*/ |
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private function validate_and_enhance_metadata(array $metadata, array $options): array { |
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// Validate title length |
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if (strlen($metadata['title']) > $options['max_title_length']) { |
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$metadata['title'] = substr($metadata['title'], 0, $options['max_title_length'] - 3) . '...'; |
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$metadata['title_truncated'] = true; |
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} |
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|
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// Validate description length |
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if (strlen($metadata['description']) > $options['max_description_length']) { |
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$metadata['description'] = substr($metadata['description'], 0, $options['max_description_length'] - 3) . '...'; |
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$metadata['description_truncated'] = true; |
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} |
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|
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// Add character counts |
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$metadata['title_length'] = strlen($metadata['title']); |
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$metadata['description_length'] = strlen($metadata['description']); |
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|
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// Calculate optimization score |
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$metadata['optimization_score'] = $this->calculate_optimization_score($metadata, $options); |
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|
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return $metadata; |
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} |
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|
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/** |
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* Save metadata to post meta |
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* |
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* @param int $post_id Post ID |
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* @param array $metadata Metadata to save |
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* @return void |
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*/ |
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private function save_post_metadata(int $post_id, array $metadata): void { |
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update_post_meta($post_id, '_thinkrank_ai_title', $metadata['title']); |
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update_post_meta($post_id, '_thinkrank_ai_description', $metadata['description']); |
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update_post_meta($post_id, '_thinkrank_focus_keyword', $metadata['focus_keyword']); |
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update_post_meta($post_id, '_thinkrank_generated_at', $metadata['generated_at']); |
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update_post_meta($post_id, '_thinkrank_metadata_full', $metadata); |
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} |
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|
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/** |
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* Calculate basic readability score |
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* |
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* @param string $content Content to analyze |
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* @return float Readability score |
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*/ |
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private function calculate_readability_score(string $content): float { |
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$sentences = preg_split('/[.!?]+/', $content); |
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$words = str_word_count($content); |
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$syllables = $this->count_syllables($content); |
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|
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if (count($sentences) === 0 || $words === 0) { |
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return 0; |
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} |
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|
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// Simplified Flesch Reading Ease formula |
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$score = 206.835 - (1.015 * ($words / count($sentences))) - (84.6 * ($syllables / $words)); |
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|
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return max(0, min(100, $score)); |
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} |
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|
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/** |
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* Count syllables in text (simplified) |
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* |
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* @param string $text Text to analyze |
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* @return int Syllable count |
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*/ |
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private function count_syllables(string $text): int { |
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$words = str_word_count($text, 1); |
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$syllables = 0; |
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|
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foreach ($words as $word) { |
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$syllables += max(1, preg_match_all('/[aeiouy]+/i', $word)); |
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} |
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|
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return $syllables; |
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} |
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|
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/** |
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* Analyze keyword density |
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* |
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* @param string $content Content to analyze |
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* @return array Keyword density analysis |
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*/ |
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private function analyze_keyword_density(string $content): array { |
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$words = str_word_count(strtolower($content), 1); |
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$total_words = count($words); |
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$word_counts = array_count_values($words); |
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|
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// Remove common stop words |
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$stop_words = ['the', 'and', 'or', 'but', 'in', 'on', 'at', 'to', 'for', 'of', 'with', 'by']; |
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$word_counts = array_diff_key($word_counts, array_flip($stop_words)); |
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|
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// Calculate density for top keywords |
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arsort($word_counts); |
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$top_keywords = array_slice($word_counts, 0, 10, true); |
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|
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$density = []; |
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foreach ($top_keywords as $word => $count) { |
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$density[$word] = round(($count / $total_words) * 100, 2); |
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} |
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|
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return $density; |
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} |
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|
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/** |
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* Analyze existing metadata |
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* |
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* @param array $metadata Metadata to analyze |
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* @return array Analysis results |
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*/ |
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private function analyze_metadata(array $metadata): array { |
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return [ |
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'title_length_ok' => strlen($metadata['title'] ?? '') <= 60, |
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'description_length_ok' => strlen($metadata['description'] ?? '') <= 160, |
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'has_focus_keyword' => !empty($metadata['focus_keyword'] ?? ''), |
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]; |
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} |
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|
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/** |
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* Generate improvement suggestions |
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* |
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* @param array $analysis Content analysis |
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* @return array Suggestions |
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*/ |
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private function generate_improvement_suggestions(array $analysis): array { |
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$suggestions = []; |
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|
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if ($analysis['content_length'] < 300) { |
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$suggestions[] = 'Consider adding more content. Longer content typically performs better in search results.'; |
| 383 |
} |
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|
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if ($analysis['readability_score'] < 60) { |
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$suggestions[] = 'Content readability could be improved. Try using shorter sentences and simpler words.'; |
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} |
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|
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return $suggestions; |
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} |
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|
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/** |
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* Calculate optimization score |
| 394 |
* |
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* @param array $metadata Generated metadata |
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* @param array $options Generation options |
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* @return int Optimization score (0-100) |
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*/ |
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private function calculate_optimization_score(array $metadata, array $options): int { |
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$score = 0; |
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|
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// Title optimization (30 points) |
| 403 |
if (!empty($metadata['title'])) { |
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$score += 15; |
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if (strlen($metadata['title']) >= 30 && strlen($metadata['title']) <= 60) { |
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$score += 15; |
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} |
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} |
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|
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// Description optimization (30 points) |
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if (!empty($metadata['description'])) { |
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$score += 15; |
| 413 |
if (strlen($metadata['description']) >= 120 && strlen($metadata['description']) <= 160) { |
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$score += 15; |
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} |
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} |
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|
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// Keyword optimization (40 points) |
| 419 |
if (!empty($metadata['focus_keyword'])) { |
| 420 |
$score += 20; |
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if (!empty($options['target_keyword']) && |
| 422 |
stripos($metadata['title'], $options['target_keyword']) !== false) { |
| 423 |
$score += 20; |
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} |
| 425 |
} |
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|
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return min(100, $score); |
| 428 |
} |
| 429 |
} |
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|
