| 1 |
<?php |
| 2 |
if (!defined('ABSPATH')) { |
| 3 |
exit; |
| 4 |
} |
| 5 |
|
| 6 |
class MxChat_Integrator { |
| 7 |
private $options; |
| 8 |
private $chat_count; |
| 9 |
|
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public function __construct() { |
| 11 |
$this->options = get_option('mxchat_options'); |
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$this->chat_count = get_option('mxchat_chat_count', 0); |
| 13 |
|
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// Add WooCommerce hooks |
| 15 |
add_action('wp_insert_post', array($this, 'mxchat_handle_product_change'), 10, 3); |
| 16 |
|
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// Ensure embeddings are removed when a product is moved to trash or permanently deleted |
| 18 |
add_action('wp_trash_post', array($this, 'mxchat_handle_product_delete')); |
| 19 |
add_action('before_delete_post', array($this, 'mxchat_handle_product_delete')); |
| 20 |
|
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add_action('wp_enqueue_scripts', array($this, 'mxchat_enqueue_scripts_styles')); |
| 22 |
add_action('wp_ajax_mxchat_handle_chat_request', array($this, 'mxchat_handle_chat_request')); |
| 23 |
add_action('wp_ajax_nopriv_mxchat_handle_chat_request', array($this, 'mxchat_handle_chat_request')); |
| 24 |
add_action('wp_ajax_mxchat_dismiss_pre_chat_message', array($this, 'mxchat_dismiss_pre_chat_message')); |
| 25 |
add_action('wp_ajax_nopriv_mxchat_dismiss_pre_chat_message', array($this, 'mxchat_dismiss_pre_chat_message')); |
| 26 |
|
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if (!wp_next_scheduled('mxchat_reset_rate_limits')) { |
| 28 |
wp_schedule_event(time(), 'daily', 'mxchat_reset_rate_limits'); |
| 29 |
} |
| 30 |
|
| 31 |
add_action('mxchat_reset_rate_limits', array($this, 'mxchat_reset_rate_limits')); |
| 32 |
} |
| 33 |
|
| 34 |
public function mxchat_handle_product_change($post_id, $post, $update) { |
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// Ensure this is a product post type |
| 36 |
if ($post->post_type !== 'product') { |
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return; |
| 38 |
} |
| 39 |
|
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// Only generate embeddings if the product is published |
| 41 |
if ($post->post_status === 'publish') { |
| 42 |
// Delay the embedding slightly to ensure all product data is available |
| 43 |
add_action('shutdown', function() use ($post_id) { |
| 44 |
$product = wc_get_product($post_id); |
| 45 |
if ($product && $product->get_price() !== '') { |
| 46 |
$this->mxchat_store_product_embedding($product); |
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} else { |
| 48 |
// Optionally, log or handle the case where product data is incomplete |
| 49 |
error_log("Product {$post_id} does not have complete data. Embedding not generated."); |
| 50 |
} |
| 51 |
}); |
| 52 |
} |
| 53 |
} |
| 54 |
|
| 55 |
public function mxchat_handle_product_delete($post_id) { |
| 56 |
if (get_post_type($post_id) !== 'product') { |
| 57 |
return; |
| 58 |
} |
| 59 |
|
| 60 |
global $wpdb; |
| 61 |
$table_name = $wpdb->prefix . 'mxchat_system_prompt_content'; |
| 62 |
|
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// Delete the embedding associated with this product |
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$wpdb->delete($table_name, array('source_url' => get_permalink($post_id)), array('%s')); |
| 65 |
} |
| 66 |
|
| 67 |
private function mxchat_store_product_embedding($product) { |
| 68 |
if (isset($this->options['enable_woocommerce_integration']) && $this->options['enable_woocommerce_integration'] === '1') { |
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|
| 70 |
$source_url = get_permalink($product->get_id()); |
| 71 |
$regular_price = $product->get_regular_price(); |
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$sale_price = $product->get_sale_price(); |
| 73 |
$price = $sale_price ?: $regular_price; |
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|
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$description = $product->get_description() . "\n\n" . |
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"Short Description: " . $product->get_short_description() . "\n" . |
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"Price: " . $regular_price . "\n" . |
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"Sale Price: " . ($sale_price ?: 'N/A') . "\n" . |
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"SKU: " . $product->get_sku(); |
| 80 |
|
| 81 |
global $wpdb; |
| 82 |
$table_name = $wpdb->prefix . 'mxchat_system_prompt_content'; |
| 83 |
|
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// Delete any existing embedding for this product |
| 85 |
$wpdb->delete($table_name, array('source_url' => $source_url), array('%s')); |
| 86 |
|
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// Submit the new content and embedding to the database |
| 88 |
MxChat_Utils::submit_content_to_db($description, $source_url, $this->options['api_key']); |
| 89 |
} |
| 90 |
} |
| 91 |
|
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|
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|
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|
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|
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private function mxchat_increment_chat_count() { |
| 97 |
$chat_count = get_option('mxchat_chat_count', 0); |
| 98 |
$chat_count++; |
| 99 |
update_option('mxchat_chat_count', $chat_count); |
| 100 |
} |
| 101 |
|
| 102 |
public function mxchat_fetch_conversation_history_for_ajax($session_id) { |
| 103 |
global $wpdb; |
| 104 |
$table_name = $wpdb->prefix . 'mxchat_chat_transcripts'; |
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|
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// Prepare and execute the query safely |
| 107 |
$chat_transcripts = $wpdb->get_results( |
| 108 |
$wpdb->prepare("SELECT * FROM $table_name WHERE session_id = %s ORDER BY timestamp ASC", sanitize_text_field($session_id)) |
| 109 |
); |
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|
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// Check if results are empty |
| 112 |
if (empty($chat_transcripts)) { |
| 113 |
return []; |
| 114 |
} |
| 115 |
|
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// Build the conversation history |
| 117 |
$conversation_history = []; |
| 118 |
foreach ($chat_transcripts as $transcript) { |
| 119 |
$conversation_history[] = [ |
| 120 |
'role' => $transcript->role, |
| 121 |
'content' => $transcript->message |
| 122 |
]; |
| 123 |
} |
| 124 |
|
| 125 |
return $conversation_history; |
| 126 |
} |
| 127 |
|
| 128 |
|
| 129 |
private function mxchat_save_chat_message($session_id, $role, $message) { |
| 130 |
global $wpdb; |
| 131 |
$table_name = $wpdb->prefix . 'mxchat_chat_transcripts'; |
| 132 |
|
| 133 |
$wpdb->insert($table_name, [ |
| 134 |
'user_id' => 0, |
| 135 |
'session_id' => $session_id, |
| 136 |
'role' => $role, |
| 137 |
'message' => $message, |
| 138 |
'timestamp' => current_time('mysql', 1) |
| 139 |
]); |
| 140 |
} |
| 141 |
|
| 142 |
|
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|
| 144 |
public function mxchat_handle_chat_request() { |
| 145 |
global $wpdb; |
| 146 |
|
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// Get and sanitize the user identifier |
| 148 |
$user_id = $this->mxchat_get_user_identifier(); |
| 149 |
$user_id = sanitize_key($user_id); |
| 150 |
|
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// Manage rate limiting |
| 152 |
$rate_limit_transient_key = 'mxchat_chat_limit_' . $user_id; |
| 153 |
$chat_count = get_transient($rate_limit_transient_key); |
| 154 |
$session_transient_key = 'mxchat_chat_session_' . $user_id; |
| 155 |
$session_id = get_transient($session_transient_key); |
| 156 |
|
| 157 |
if ($chat_count === false) { |
| 158 |
$chat_count = 0; |
| 159 |
} |
| 160 |
|
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if ($session_id === false) { |
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$session_id = uniqid('mxchat_chat_', true); |
| 163 |
set_transient($session_transient_key, $session_id, DAY_IN_SECONDS); // Store session ID for a day |
| 164 |
} |
| 165 |
|
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$rate_limit_option = isset($this->options['rate_limit']) ? $this->options['rate_limit'] : 'unlimited'; |
| 167 |
|
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// Check if rate limit is not 'unlimited' |
| 169 |
if ($rate_limit_option !== 'unlimited') { |
| 170 |
$rate_limit = intval($rate_limit_option); |
| 171 |
|
| 172 |
if ($chat_count >= $rate_limit) { |
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wp_send_json_error('Rate limit exceeded. Please try again later.'); |
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wp_die(); |
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} |
| 176 |
set_transient($rate_limit_transient_key, $chat_count + 1, DAY_IN_SECONDS); |
| 177 |
} |
| 178 |
|
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// Validate and sanitize the incoming message |
| 180 |
if (!isset($_POST['message'])) { |
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wp_send_json_error('No message received'); |
| 182 |
wp_die(); |
| 183 |
} |
| 184 |
|
| 185 |
$message = sanitize_text_field($_POST['message']); |
| 186 |
if (empty($message)) { |
| 187 |
wp_send_json_error('Message is empty or invalid.'); |
| 188 |
wp_die(); |
| 189 |
} |
| 190 |
|
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// Save the user message to the database |
| 192 |
$this->mxchat_save_chat_message($session_id, 'user', $message); |
| 193 |
|
| 194 |
// Generate and validate the embedding |
| 195 |
$user_message_embedding = $this->mxchat_generate_embedding($message, $this->options['api_key']); |
| 196 |
if (!is_array($user_message_embedding)) { |
| 197 |
wp_send_json_error('Error processing your message.'); |
| 198 |
wp_die(); |
| 199 |
} |
| 200 |
|
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// Find relevant content based on embedding |
| 202 |
$relevant_content = $this->mxchat_find_relevant_content($user_message_embedding); |
| 203 |
|
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// Fetch conversation history from the database |
| 205 |
$conversation_history = $this->mxchat_fetch_conversation_history_for_ajax($session_id); |
| 206 |
|
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// Increment the chat count |
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$this->mxchat_increment_chat_count(); |
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|
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// Generate a response from the AI model |
| 211 |
$response = $this->mxchat_generate_response($relevant_content, $this->options['api_key'], $conversation_history); |
| 212 |
|
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// Save the bot response to the database |
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$this->mxchat_save_chat_message($session_id, 'bot', $response); |
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|
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// Send the response back to the client |
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wp_send_json(['message' => $response]); |
| 218 |
|
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wp_die(); |
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} |
| 221 |
|
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|
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private function mxchat_get_user_identifier() { |
| 224 |
return sanitize_text_field($_SERVER['REMOTE_ADDR']); |
| 225 |
} |
| 226 |
|
| 227 |
|
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|
| 229 |
private function mxchat_generate_embedding($text, $api_key) { |
| 230 |
$endpoint = 'https://api.openai.com/v1/embeddings'; |
| 231 |
|
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$body = wp_json_encode([ |
| 233 |
'input' => $text, |
| 234 |
'model' => 'text-embedding-ada-002' |
| 235 |
]); |
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|
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$args = [ |
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'body' => $body, |
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'headers' => [ |
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'Content-Type' => 'application/json', |
| 241 |
'Authorization' => 'Bearer ' . $api_key, |
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], |
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'timeout' => 60, |
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'redirection' => 5, |
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'blocking' => true, |
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'httpversion' => '1.0', |
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'sslverify' => true, |
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]; |
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|
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$response = wp_remote_post($endpoint, $args); |
| 251 |
|
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if (is_wp_error($response)) { |
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return null; |
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} |
| 255 |
|
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$response_body = json_decode(wp_remote_retrieve_body($response), true); |
| 257 |
|
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if (isset($response_body['data'][0]['embedding']) && is_array($response_body['data'][0]['embedding'])) { |
| 259 |
return $response_body['data'][0]['embedding']; |
| 260 |
} else { |
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return null; |
| 262 |
} |
| 263 |
} |
| 264 |
|
| 265 |
private function mxchat_find_relevant_content($user_embedding) { |
| 266 |
global $wpdb; |
| 267 |
$system_prompt_table = $wpdb->prefix . 'mxchat_system_prompt_content'; |
| 268 |
|
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// Define a cache key for embeddings |
| 270 |
$cache_key = 'mxchat_system_prompt_embeddings'; |
| 271 |
|
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// Attempt to get the embeddings from the cache |
| 273 |
$embeddings = wp_cache_get($cache_key, 'mxchat_system_prompts'); |
| 274 |
|
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if ($embeddings === false) { |
| 276 |
// Cache miss, query the database and cache the results |
| 277 |
$query = "SELECT id, embedding_vector FROM {$system_prompt_table}"; |
| 278 |
$embeddings = $wpdb->get_results($query); |
| 279 |
|
| 280 |
if ($embeddings === null || empty($embeddings)) { |
| 281 |
error_log("No embeddings found in the database."); |
| 282 |
return null; // Return null to handle no embeddings gracefully |
| 283 |
} |
| 284 |
|
| 285 |
// Cache the results if successful |
| 286 |
wp_cache_set($cache_key, $embeddings, 'mxchat_system_prompts', 3600); // Cache for 1 hour |
| 287 |
} |
| 288 |
|
| 289 |
$most_relevant_id = null; |
| 290 |
$highest_similarity = -INF; |
| 291 |
|
| 292 |
foreach ($embeddings as $embedding) { |
| 293 |
$database_embedding = maybe_unserialize($embedding->embedding_vector); |
| 294 |
|
| 295 |
// Debugging: Log the embeddings |
| 296 |
// if (!is_array($database_embedding)) { |
| 297 |
// error_log("Invalid database embedding format for ID {$embedding->id}: " . print_r($database_embedding, true)); |
| 298 |
// continue; |
| 299 |
// } |
| 300 |
|
| 301 |
if (is_array($user_embedding)) { |
| 302 |
$similarity = $this->mxchat_calculate_cosine_similarity($user_embedding, $database_embedding); |
| 303 |
|
| 304 |
// Debugging: Log the similarity score |
| 305 |
// error_log("Calculated similarity for ID {$embedding->id}: {$similarity}"); |
| 306 |
|
| 307 |
if ($similarity > $highest_similarity) { |
| 308 |
$highest_similarity = $similarity; |
| 309 |
$most_relevant_id = $embedding->id; |
| 310 |
} |
| 311 |
} else { |
| 312 |
// error_log("User embedding is not an array. Embedding data: " . print_r($user_embedding, true)); |
| 313 |
} |
| 314 |
} |
| 315 |
|
| 316 |
if ($most_relevant_id !== null) { |
| 317 |
// Fetch content with product links |
| 318 |
return $this->fetch_content_with_product_links($most_relevant_id); |
| 319 |
} |
| 320 |
|
| 321 |
error_log("No relevant content found. Most relevant ID was null."); |
| 322 |
return null; // Return null if no relevant content is found |
| 323 |
} |
| 324 |
|
| 325 |
|
| 326 |
private function fetch_content_with_product_links($most_relevant_id) { |
| 327 |
global $wpdb; |
| 328 |
$system_prompt_table = $wpdb->prefix . 'mxchat_system_prompt_content'; |
| 329 |
|
| 330 |
// Fetch the article content and associated product URL |
| 331 |
$query = $wpdb->prepare("SELECT article_content, source_url FROM {$system_prompt_table} WHERE id = %d", $most_relevant_id); |
| 332 |
$result = $wpdb->get_row($query); |
| 333 |
|
| 334 |
if ($result) { |
| 335 |
// Append the product link to the content if available |
| 336 |
$content = $result->article_content; |
| 337 |
if (!empty($result->source_url)) { |
| 338 |
$content .= "\n\nFor more details, check out this product: " . esc_url($result->source_url); |
| 339 |
} |
| 340 |
return $content; |
| 341 |
} |
| 342 |
|
| 343 |
return null; |
| 344 |
} |
| 345 |
|
| 346 |
|
| 347 |
private function mxchat_generate_response($relevant_content, $api_key, $conversation_history) { |
| 348 |
if (!$relevant_content) { |
| 349 |
return "I'm sorry, I couldn't find relevant information on that topic."; |
| 350 |
} |
| 351 |
|
| 352 |
$system_prompt_instructions = isset($this->options['system_prompt_instructions']) ? $this->options['system_prompt_instructions'] : ''; |
| 353 |
|
| 354 |
$content_with_instructions = $system_prompt_instructions . " " . $relevant_content; |
| 355 |
|
| 356 |
array_unshift($conversation_history, [ |
| 357 |
'role' => 'system', |
| 358 |
'content' => "Here are your instructions: " . $content_with_instructions |
| 359 |
]); |
| 360 |
|
| 361 |
foreach ($conversation_history as &$message) { |
| 362 |
if ($message['role'] === 'bot') { |
| 363 |
$message['role'] = 'assistant'; |
| 364 |
} |
| 365 |
} |
| 366 |
|
| 367 |
$api_url = 'https://api.openai.com/v1/chat/completions'; |
| 368 |
|
| 369 |
$body = json_encode([ |
| 370 |
'model' => isset($this->options['model']) ? $this->options['model'] : 'gpt-3.5', |
| 371 |
'messages' => $conversation_history, |
| 372 |
]); |
| 373 |
|
| 374 |
$args = [ |
| 375 |
'body' => $body, |
| 376 |
'headers' => [ |
| 377 |
'Content-Type' => 'application/json', |
| 378 |
'Authorization' => 'Bearer ' . $api_key, |
| 379 |
], |
| 380 |
'timeout' => 60, |
| 381 |
'redirection' => 5, |
| 382 |
'blocking' => true, |
| 383 |
'httpversion' => '1.0', |
| 384 |
'sslverify' => true, |
| 385 |
]; |
| 386 |
|
| 387 |
$response = wp_remote_post($api_url, $args); |
| 388 |
|
| 389 |
if (is_wp_error($response)) { |
| 390 |
return "Sorry, there was an error processing your request."; |
| 391 |
} |
| 392 |
|
| 393 |
$response_body = json_decode(wp_remote_retrieve_body($response), true); |
| 394 |
|
| 395 |
if (isset($response_body['choices'][0]['message']['content'])) { |
| 396 |
if (isset($response_body['usage'])) { |
| 397 |
$prompt_tokens = $response_body['usage']['prompt_tokens']; |
| 398 |
$total_tokens = $response_body['usage']['total_tokens']; |
| 399 |
} |
| 400 |
return trim($response_body['choices'][0]['message']['content']); |
| 401 |
} else { |
| 402 |
return "Sorry, I couldn't process that request."; |
| 403 |
} |
| 404 |
} |
| 405 |
|
| 406 |
|
| 407 |
public function mxchat_dismiss_pre_chat_message() { |
| 408 |
// Get and sanitize the user identifier |
| 409 |
$user_id = $this->mxchat_get_user_identifier(); |
| 410 |
$user_id = sanitize_key($user_id); |
| 411 |
|
| 412 |
// Set a transient to track that the user has dismissed the pre-chat message |
| 413 |
$transient_key = 'mxchat_pre_chat_message_dismissed_' . $user_id; |
| 414 |
set_transient($transient_key, true, DAY_IN_SECONDS); |
| 415 |
|
| 416 |
wp_send_json_success(); |
| 417 |
} |
| 418 |
|
| 419 |
|
| 420 |
|
| 421 |
private function mxchat_calculate_cosine_similarity($vectorA, $vectorB) { |
| 422 |
if (!is_array($vectorA) || !is_array($vectorB) || empty($vectorA) || empty($vectorB)) { |
| 423 |
return 0; |
| 424 |
} |
| 425 |
|
| 426 |
$dotProduct = array_sum(array_map(function ($a, $b) { |
| 427 |
return $a * $b; |
| 428 |
}, $vectorA, $vectorB)); |
| 429 |
$normA = sqrt(array_sum(array_map(function ($a) { |
| 430 |
return $a * $a; |
| 431 |
}, $vectorA))); |
| 432 |
$normB = sqrt(array_sum(array_map(function ($b) { |
| 433 |
return $b * $b; |
| 434 |
}, $vectorB))); |
| 435 |
|
| 436 |
if ($normA == 0 || $normB == 0) { |
| 437 |
return 0; |
| 438 |
} |
| 439 |
|
| 440 |
return $dotProduct / ($normA * $normB); |
| 441 |
} |
| 442 |
|
| 443 |
public function mxchat_enqueue_scripts_styles() { |
| 444 |
// Define version numbers for the styles and scripts |
| 445 |
$chat_style_version = '1.0.6'; // Replace with your actual version |
| 446 |
$chat_script_version = '1.0.6'; // Replace with your actual version |
| 447 |
|
| 448 |
// Correct path to the script file |
| 449 |
wp_enqueue_script( |
| 450 |
'mxchat-chat-js', // Handle for the script |
| 451 |
plugin_dir_url(__FILE__) . '../js/chat-script.js', // Correct path using __FILE__ |
| 452 |
array('jquery'), // Dependencies |
| 453 |
$chat_script_version, // Version for cache busting |
| 454 |
true // Load script in footer |
| 455 |
); |
| 456 |
|
| 457 |
// Enqueue the CSS file similarly |
| 458 |
wp_enqueue_style( |
| 459 |
'mxchat-chat-css', // Handle for the style |
| 460 |
plugin_dir_url(__FILE__) . '../css/chat-style.css', // Correct path using __FILE__ |
| 461 |
array(), // No dependencies |
| 462 |
$chat_style_version // Version for cache busting |
| 463 |
); |
| 464 |
|
| 465 |
// Fetch options from the database |
| 466 |
$this->options = get_option('mxchat_options'); |
| 467 |
|
| 468 |
// Prepare settings to pass to JavaScript |
| 469 |
$style_settings = array( |
| 470 |
'ajax_url' => admin_url('admin-ajax.php'), |
| 471 |
'nonce' => wp_create_nonce('mxchat_chat_nonce'), // Nonce for security |
| 472 |
'rate_limit_message' => 'Rate limit exceeded. Please try again later.', |
| 473 |
'appendWidgetToBody' => $this->options['append_to_body'] ?? 'off' |
| 474 |
); |
| 475 |
|
| 476 |
// Localize the script with necessary data |
| 477 |
wp_localize_script('mxchat-chat-js', 'mxchatChat', $style_settings); |
| 478 |
} |
| 479 |
|
| 480 |
|
| 481 |
|
| 482 |
public function mxchat_reset_rate_limits() { |
| 483 |
global $wpdb; |
| 484 |
|
| 485 |
// Define a cache key pattern for rate limits |
| 486 |
$cache_key_pattern = 'mxchat_chat_limit_%'; |
| 487 |
|
| 488 |
// Retrieve all option names matching the pattern |
| 489 |
// phpcs:ignore WordPress.DB.DirectDatabaseQuery.NoCaching, WordPress.DB.DirectDatabaseQuery.DirectQuery |
| 490 |
$option_names = $wpdb->get_col("SELECT option_name FROM {$wpdb->options} WHERE option_name LIKE 'mxchat_chat_limit_%'"); |
| 491 |
|
| 492 |
// db call ok; no-cache ok |
| 493 |
// phpcs:ignore WordPress.DB.DirectDatabaseQuery.DirectQuery -- db call ok |
| 494 |
$wpdb->query("DELETE FROM {$wpdb->options} WHERE option_name LIKE 'mxchat_chat_limit_%'"); |
| 495 |
|
| 496 |
// Clear the relevant cache entries |
| 497 |
foreach ($option_names as $option_name) { |
| 498 |
wp_cache_delete($option_name, 'options'); |
| 499 |
} |
| 500 |
|
| 501 |
// Optionally, clear a general cache if you have one |
| 502 |
wp_cache_delete('mxchat_all_chat_limits', 'options'); |
| 503 |
} |
| 504 |
|
| 505 |
|
| 506 |
private function mxchat_fetch_woocommerce_products() { |
| 507 |
// Ensure WooCommerce is active |
| 508 |
if (!class_exists('WooCommerce')) { |
| 509 |
return []; |
| 510 |
} |
| 511 |
|
| 512 |
$args = array( |
| 513 |
'post_type' => 'product', |
| 514 |
'post_status' => 'publish', |
| 515 |
'posts_per_page' => -1, |
| 516 |
); |
| 517 |
|
| 518 |
$products = get_posts($args); |
| 519 |
$product_data = []; |
| 520 |
|
| 521 |
foreach ($products as $product) { |
| 522 |
$product_id = $product->ID; |
| 523 |
$product_obj = wc_get_product($product_id); |
| 524 |
|
| 525 |
$product_data[] = array( |
| 526 |
'id' => $product_id, |
| 527 |
'name' => $product_obj->get_name(), |
| 528 |
'description' => $product_obj->get_description(), |
| 529 |
'short_description' => $product_obj->get_short_description(), |
| 530 |
'url' => get_permalink($product_id), |
| 531 |
'price' => $product_obj->get_regular_price(), |
| 532 |
'sale_price' => $product_obj->get_sale_price(), |
| 533 |
'stock_status' => $product_obj->get_stock_status(), |
| 534 |
'sku' => $product_obj->get_sku(), |
| 535 |
'in_stock' => $product_obj->is_in_stock(), |
| 536 |
'total_sales' => $product_obj->get_total_sales(), |
| 537 |
); |
| 538 |
} |
| 539 |
|
| 540 |
return $product_data; |
| 541 |
} |
| 542 |
|
| 543 |
|
| 544 |
|
| 545 |
|
| 546 |
|
| 547 |
|
| 548 |
|
| 549 |
} |
| 550 |
?> |
| 551 |
|
