| 1 |
<?php |
| 2 |
/** |
| 3 |
* Word document handler and processor for MXChat |
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* Can be directly bundled in WordPress plugins |
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*/ |
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class MXChat_Word_Handler { |
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private $temp_dir; |
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private $options; |
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|
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public function __construct($options) { |
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$this->options = $options; |
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$this->temp_dir = wp_upload_dir()['path']; |
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} |
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|
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/** |
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* Handle Word document upload and processing |
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*/ |
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public function mxchat_handle_word_upload() { |
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check_ajax_referer('mxchat_chat_nonce', 'nonce'); |
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|
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if (!isset($_FILES['word_file']) || !isset($_POST['session_id'])) { |
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wp_send_json_error(esc_html__('Missing required parameters.', 'mxchat')); |
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return; |
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} |
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|
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$file = $_FILES['word_file']; |
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$session_id = sanitize_text_field($_POST['session_id']); |
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$original_filename = sanitize_text_field($file['name']); |
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|
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// Check file type |
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$allowed_types = array( |
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'docx' => 'application/vnd.openxmlformats-officedocument.wordprocessingml.document' |
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); |
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$file_type = wp_check_filetype($file['name'], $allowed_types); |
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|
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if (!$file_type['type']) { |
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wp_send_json_error(esc_html__('Invalid file type. Only .docx files are allowed.', 'mxchat')); |
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return; |
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} |
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|
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// Generate unique filename |
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$word_filename = 'mxchat_word_' . $session_id . '_' . time() . '.docx'; |
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$word_path = $this->temp_dir . '/' . $word_filename; |
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|
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if (!move_uploaded_file($file['tmp_name'], $word_path)) { |
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wp_send_json_error(esc_html__('Failed to upload file.', 'mxchat')); |
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return; |
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} |
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|
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$this->mxchat_clear_word_transients($session_id); |
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|
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// Process the document |
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$embeddings = $this->mxchat_process_word_document($word_path); |
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|
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if ($embeddings === false || empty($embeddings)) { |
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unlink($word_path); |
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$error_message = $this->options['word_intent_error_text'] ?? |
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esc_html__('The uploaded document appears to be empty or contains unsupported content.', 'mxchat'); |
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wp_send_json_error($error_message); |
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return; |
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} |
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|
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// Store the embeddings and file information |
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set_transient('mxchat_word_url_' . $session_id, $word_path, HOUR_IN_SECONDS); |
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set_transient('mxchat_word_filename_' . $session_id, $original_filename, HOUR_IN_SECONDS); |
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set_transient('mxchat_word_embeddings_' . $session_id, $embeddings, HOUR_IN_SECONDS); |
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set_transient('mxchat_include_word_in_context_' . $session_id, true, HOUR_IN_SECONDS); |
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|
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$success_message = $this->options['pdf_intent_success_text'] ?? |
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__("I've processed the document. What questions do you have about it?", 'mxchat'); |
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|
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wp_send_json_success([ |
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'message' => $success_message, |
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'filename' => $original_filename |
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]); |
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} |
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|
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/** |
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* Process Word document and generate embeddings |
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*/ |
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private function mxchat_process_word_document($file_path) { |
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// Get the maximum number of pages allowed from admin settings |
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$max_pages = isset($this->options['pdf_max_pages']) ? intval($this->options['pdf_max_pages']) : 69; // Use same setting as PDF |
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|
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try { |
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$zip = new ZipArchive(); |
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if ($zip->open($file_path) !== true) { |
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return false; |
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} |
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|
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// Extract main document content |
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$content = $zip->getFromName('word/document.xml'); |
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$zip->close(); |
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|
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if ($content === false) { |
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return false; |
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} |
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|
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// Clean up the content |
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$text = $this->mxchat_clean_word_content($content); |
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|
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// Count pages (roughly estimate based on paragraphs) |
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$paragraphs = explode("\n\n", $text); |
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$estimated_pages = ceil(count($paragraphs) / 3); // Assume ~3 paragraphs per page |
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|
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if ($estimated_pages > $max_pages) { |
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return esc_html__('too_many_pages', 'mxchat'); |
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} |
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|
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// Split into chunks and continue processing... |
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$chunks = $this->mxchat_split_word_into_chunks($text, 1000); |
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|
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$embeddings = []; |
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foreach ($chunks as $chunk_number => $chunk) { |
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if (empty(trim($chunk))) { |
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continue; |
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} |
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|
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$embedding = $this->mxchat_generate_embedding_word( |
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esc_html__('Chunk ', 'mxchat') . ($chunk_number + 1) . ': ' . $chunk, |
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$this->options['api_key'] |
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); |
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|
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if ($embedding) { |
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$embeddings[] = [ |
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'chunk_number' => $chunk_number + 1, |
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'embedding' => $embedding, |
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'text' => $chunk, |
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]; |
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} |
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} |
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|
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return $embeddings; |
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|
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} catch (Exception $e) { |
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return false; |
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} |
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} |
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/** |
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* Clean Word XML content |
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*/ |
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private function mxchat_clean_word_content($content) { |
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// Remove XML namespaces |
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$content = preg_replace('/xmlns[^=]*="[^"]*"/i', '', $content); |
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|
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// Convert Word XML elements to text |
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$content = str_replace('</w:p>', "\n", $content); |
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$content = str_replace('</w:tr>', "\n", $content); |
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|
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// Strip remaining XML tags |
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$content = strip_tags($content); |
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|
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// Clean up whitespace |
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$content = preg_replace('/\s+/', ' ', $content); |
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$content = preg_replace('/\n\s*\n/', "\n\n", $content); |
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|
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return trim($content); |
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} |
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|
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/** |
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* Split text into manageable chunks |
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*/ |
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private function mxchat_split_word_into_chunks($text, $chunk_size) { |
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$chunks = []; |
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$paragraphs = explode("\n\n", $text); |
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|
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$current_chunk = ''; |
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foreach ($paragraphs as $paragraph) { |
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if (strlen($current_chunk) + strlen($paragraph) > $chunk_size) { |
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if (!empty($current_chunk)) { |
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$chunks[] = trim($current_chunk); |
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} |
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$current_chunk = $paragraph; |
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} else { |
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$current_chunk .= (!empty($current_chunk) ? "\n\n" : '') . $paragraph; |
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} |
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} |
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|
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if (!empty($current_chunk)) { |
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$chunks[] = trim($current_chunk); |
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} |
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|
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return $chunks; |
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} |
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|
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/** |
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* Remove Word document and clean up transients |
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*/ |
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public function mxchat_handle_word_remove() { |
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check_ajax_referer('mxchat_chat_nonce', 'nonce'); |
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|
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if (empty($_POST['session_id'])) { |
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wp_send_json_error(esc_html__('Session ID missing.', 'mxchat')); |
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return; |
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} |
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|
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$session_id = sanitize_text_field($_POST['session_id']); |
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$word_path = get_transient('mxchat_word_url_' . $session_id); |
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|
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if ($word_path && file_exists($word_path)) { |
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unlink($word_path); |
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} |
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|
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$this->mxchat_clear_word_transients($session_id); |
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|
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wp_send_json_success([ |
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'message' => esc_html__('Document removed successfully.', 'mxchat') |
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]); |
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} |
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|
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/** |
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* Clear all Word-related transients |
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*/ |
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private function mxchat_clear_word_transients($session_id) { |
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delete_transient('mxchat_word_url_' . $session_id); |
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delete_transient('mxchat_word_filename_' . $session_id); |
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delete_transient('mxchat_word_embeddings_' . $session_id); |
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delete_transient('mxchat_include_word_in_context_' . $session_id); |
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} |
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|
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/** |
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* Find relevant chunks from the Word document |
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*/ |
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public function mxchat_find_relevant_word_chunks($query_embedding, $embeddings) { |
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$most_relevant = null; |
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$highest_similarity = -INF; |
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|
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foreach ($embeddings as $chunk_data) { |
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$similarity = $this->mxchat_calculate_cosine_similarity_word($query_embedding, $chunk_data['embedding']); |
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|
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if ($similarity > $highest_similarity) { |
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$highest_similarity = $similarity; |
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$most_relevant = $chunk_data['chunk_number']; |
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} |
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} |
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|
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if (!is_null($most_relevant)) { |
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$chunk_numbers = range( |
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max(1, $most_relevant - 1), |
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min(count($embeddings), $most_relevant + 1) |
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); |
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return array_filter($embeddings, function ($chunk) use ($chunk_numbers) { |
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return in_array($chunk['chunk_number'], $chunk_numbers); |
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}); |
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} |
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|
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return []; |
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} |
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|
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/** |
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* Handle Word document discussion similar to PDF discussion |
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*/ |
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public function mxchat_handle_word_discussion($message, $user_id, $session_id) { |
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// Get stored embeddings for the session |
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$embeddings = get_transient('mxchat_word_embeddings_' . $session_id); |
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$word_path = get_transient('mxchat_word_url_' . $session_id); |
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|
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if (!$embeddings || !$word_path) { |
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$trigger_text = $this->options['word_intent_trigger_text'] ?? |
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__("Please upload a Word document (.docx) that you'd like to discuss.", 'mxchat'); |
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set_transient('mxchat_waiting_for_word_' . $session_id, true, HOUR_IN_SECONDS); |
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$this->fallbackResponse['text'] = $trigger_text; |
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return; |
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} |
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|
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// Set context flag for including Word content in conversation |
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set_transient('mxchat_include_word_in_context_' . $session_id, true, HOUR_IN_SECONDS); |
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$this->fallbackResponse['text'] = ''; // Proceed without additional message |
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} |
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|
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|
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private function mxchat_generate_embedding_word($text, $api_key) { |
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$endpoint = 'https://api.openai.com/v1/embeddings'; |
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|
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$body = wp_json_encode([ |
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'input' => $text, |
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'model' => 'text-embedding-ada-002' |
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]); |
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|
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$args = [ |
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'body' => $body, |
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'headers' => [ |
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'Content-Type' => 'application/json', |
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'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, $args); |
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|
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if (is_wp_error($response)) { |
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return null; |
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} |
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|
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$response_body = json_decode(wp_remote_retrieve_body($response), true); |
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|
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if (isset($response_body['data'][0]['embedding']) && is_array($response_body['data'][0]['embedding'])) { |
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return $response_body['data'][0]['embedding']; |
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} else { |
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return null; |
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} |
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} |
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|
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|
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private function mxchat_calculate_cosine_similarity_word($vectorA, $vectorB) { |
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if (!is_array($vectorA) || !is_array($vectorB) || empty($vectorA) || empty($vectorB)) { |
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return 0; |
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} |
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|
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$dotProduct = array_sum(array_map(function ($a, $b) { |
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return $a * $b; |
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}, $vectorA, $vectorB)); |
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$normA = sqrt(array_sum(array_map(function ($a) { |
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return $a * $a; |
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}, $vectorA))); |
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$normB = sqrt(array_sum(array_map(function ($b) { |
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return $b * $b; |
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}, $vectorB))); |
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|
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if ($normA == 0 || $normB == 0) { |
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return 0; |
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} |
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|
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return $dotProduct / ($normA * $normB); |
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} |
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|
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|
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} |
