<?php
/**
 * Workflow management class
 */
class TWP_Workflow {
    
    /**
     * Create workflow
     */
    public static function create_workflow($data) {
        global $wpdb;
        $table_name = $wpdb->prefix . 'twp_workflows';
        
        $workflow_data = array(
            'steps' => $data['steps'],
            'conditions' => $data['conditions'],
            'actions' => $data['actions']
        );
        
        return $wpdb->insert(
            $table_name,
            array(
                'workflow_name' => sanitize_text_field($data['workflow_name']),
                'phone_number' => sanitize_text_field($data['phone_number']),
                'workflow_data' => json_encode($workflow_data),
                'is_active' => isset($data['is_active']) ? 1 : 0
            ),
            array('%s', '%s', '%s', '%d')
        );
    }
    
    /**
     * Execute workflow
     */
    public static function execute_workflow($workflow_id, $call_data) {
        $workflow = self::get_workflow($workflow_id);
        
        if (!$workflow || !$workflow->is_active) {
            return false;
        }
        
        $workflow_data = json_decode($workflow->workflow_data, true);
        $twilio = new TWP_Twilio_API();
        $elevenlabs = new TWP_ElevenLabs_API();
        
        // Store call data globally for access in step functions
        $GLOBALS['call_data'] = $call_data;
        
        // Initialize combined TwiML response
        $response = new \Twilio\TwiML\VoiceResponse();
        $has_response = false;
        
        error_log('TWP Workflow: Starting execution for workflow ID: ' . $workflow_id);
        error_log('TWP Workflow: Call data: ' . json_encode($call_data));
        error_log('TWP Workflow: Steps count: ' . count($workflow_data['steps']));
        
        // Process workflow steps
        foreach ($workflow_data['steps'] as $step) {
            // Check conditions first
            if (isset($step['conditions'])) {
                if (!self::check_conditions($step['conditions'], $call_data)) {
                    continue;
                }
            }
            
            $step_twiml = null;
            $stop_after_step = false;
            
            switch ($step['type']) {
                case 'greeting':
                    $step_twiml = self::create_greeting_twiml($step, $elevenlabs);
                    break;
                    
                case 'ivr_menu':
                    // Add workflow_id to the step data
                    $step['workflow_id'] = $workflow_id;
                    $step_twiml = self::create_ivr_menu_twiml($step, $elevenlabs);
                    $stop_after_step = true; // IVR menu needs user input, stop here
                    break;
                    
                case 'forward':
                    $step_twiml = self::create_forward_twiml($step);
                    $stop_after_step = true; // Forward ends the workflow
                    break;
                    
                case 'queue':
                    error_log('TWP Workflow: Processing queue step: ' . json_encode($step));
                    $step_twiml = self::create_queue_twiml($step, $elevenlabs);
                    $stop_after_step = true; // Queue ends the workflow
                    break;
                    
                case 'browser_call':
                    error_log('TWP Workflow: Processing browser call step: ' . json_encode($step));
                    $step_twiml = self::create_browser_call_twiml($step, $elevenlabs);
                    $stop_after_step = true; // Browser call ends the workflow
                    break;
                    
                case 'ring_group':
                    $step_twiml = self::create_ring_group_twiml($step);
                    $stop_after_step = true; // Ring group ends the workflow
                    break;
                    
                case 'voicemail':
                    // Add workflow_id to the step data
                    $step['workflow_id'] = $workflow_id;
                    $step_twiml = self::create_voicemail_twiml($step, $elevenlabs);
                    $stop_after_step = true; // Voicemail recording ends the workflow
                    break;
                    
                case 'schedule_check':
                    $schedule_result = self::handle_schedule_check($step, $call_data);
                    if ($schedule_result === false) {
                        // Continue to next step (within business hours)
                        error_log('TWP Schedule Check: Within business hours, continuing to next step');
                        continue 2;
                    } elseif ($schedule_result) {
                        // After-hours steps returned TwiML - execute and stop
                        error_log('TWP Schedule Check: After hours, executing after-hours steps');
                        $step_twiml = $schedule_result;
                        $stop_after_step = true;
                    } else {
                        // No schedule or no after-hours steps - continue with next step
                        error_log('TWP Schedule Check: No schedule configured or no after-hours steps, continuing');
                        continue 2;
                    }
                    break;
                    
                case 'sms':
                    self::send_sms_notification($step, $call_data);
                    continue 2;
                    
                default:
                    continue 2;
            }
            
            // Add step TwiML to combined response
            if ($step_twiml) {
                // Parse the step TwiML and append to combined response
                $step_xml = simplexml_load_string($step_twiml);
                if ($step_xml) {
                    foreach ($step_xml->children() as $element) {
                        self::append_twiml_element($response, $element);
                    }
                    $has_response = true;
                }
                
                // Stop processing if this step type should end the workflow
                if ($stop_after_step) {
                    break;
                }
            }
        }
        
        // Return combined response or default
        if ($has_response) {
            return $response->asXML();
        }
        
        // Default response
        return self::create_default_response();
    }
    
    /**
     * Helper function to append SimpleXMLElement to TwiML Response
     */
    private static function append_twiml_element($response, $element) {
        $name = $element->getName();
        $text = (string) $element;
        $attributes = array();
        
        foreach ($element->attributes() as $key => $value) {
            $attributes[$key] = (string) $value;
        }
        
        // Handle different TwiML verbs
        switch ($name) {
            case 'Say':
                $response->say($text, $attributes);
                break;
            case 'Play':
                $response->play($text, $attributes);
                break;
            case 'Gather':
                $gather = $response->gather($attributes);
                // Add child elements to gather
                foreach ($element->children() as $child) {
                    $child_name = $child->getName();
                    if ($child_name === 'Say') {
                        $gather->say((string) $child, self::get_attributes($child));
                    } elseif ($child_name === 'Play') {
                        $gather->play((string) $child, self::get_attributes($child));
                    }
                }
                break;
            case 'Record':
                $response->record($attributes);
                break;
            case 'Dial':
                $response->dial((string) $element, $attributes);
                break;
            case 'Queue':
                $response->queue((string) $element, $attributes);
                break;
            case 'Redirect':
                $response->redirect((string) $element, $attributes);
                break;
            case 'Pause':
                $response->pause($attributes);
                break;
            case 'Hangup':
                $response->hangup();
                break;
        }
    }
    
    /**
     * Helper to get attributes as array
     */
    private static function get_attributes($element) {
        $attributes = array();
        foreach ($element->attributes() as $key => $value) {
            $attributes[$key] = (string) $value;
        }
        return $attributes;
    }
    
    /**
     * Create greeting TwiML
     */
    private static function create_greeting_twiml($step, $elevenlabs) {
        $twiml = new SimpleXMLElement('<?xml version="1.0" encoding="UTF-8"?><Response></Response>');
        
        // Get message from either data array or direct property
        $message = null;
        if (isset($step['data']['message']) && !empty($step['data']['message'])) {
            $message = $step['data']['message'];
        } elseif (isset($step['message']) && !empty($step['message'])) {
            $message = $step['message'];
        } else {
            $message = 'Welcome to our phone system.';
        }
        
        // Check for new audio_type structure or legacy use_tts
        $audio_type = isset($step['data']['audio_type']) ? $step['data']['audio_type'] : 
                      (isset($step['audio_type']) ? $step['audio_type'] : 
                      (isset($step['data']['use_tts']) && $step['data']['use_tts'] ? 'tts' : 
                      (isset($step['use_tts']) && $step['use_tts'] ? 'tts' : 'say')));
        
        switch ($audio_type) {
            case 'tts':
                // Generate TTS audio
                $voice_id = isset($step['data']['voice_id']) ? $step['data']['voice_id'] : 
                           (isset($step['voice_id']) ? $step['voice_id'] : null);
                $audio_result = $elevenlabs->text_to_speech($message, [
                    'voice_id' => $voice_id
                ]);
                
                if ($audio_result['success']) {
                    $play = $twiml->addChild('Play', $audio_result['file_url']);
                } else {
                    // Fallback to Say
                    $say = $twiml->addChild('Say', $message);
                    $say->addAttribute('voice', 'alice');
                }
                break;
                
            case 'audio':
                // Use provided audio file
                $audio_url = isset($step['data']['audio_url']) ? $step['data']['audio_url'] : 
                            (isset($step['audio_url']) ? $step['audio_url'] : null);
                            
                if ($audio_url && !empty($audio_url)) {
                    $play = $twiml->addChild('Play', $audio_url);
                } else {
                    // Fallback to Say if no audio URL provided
                    $say = $twiml->addChild('Say', $message);
                    $say->addAttribute('voice', 'alice');
                }
                break;
                
            default: // 'say' or fallback
                $say = $twiml->addChild('Say', $message);
                $say->addAttribute('voice', 'alice');
                break;
        }
        
        return $twiml->asXML();
    }
    
    /**
     * Create IVR menu TwiML
     */
    private static function create_ivr_menu_twiml($step, $elevenlabs) {
        $twiml = new SimpleXMLElement('<?xml version="1.0" encoding="UTF-8"?><Response></Response>');
        
        $gather = $twiml->addChild('Gather');
        $gather->addAttribute('numDigits', isset($step['data']['num_digits']) ? $step['data']['num_digits'] : 
                                        (isset($step['num_digits']) ? $step['num_digits'] : '1'));
        $gather->addAttribute('timeout', isset($step['data']['timeout']) ? $step['data']['timeout'] : 
                                        (isset($step['timeout']) ? $step['timeout'] : '10'));
        
        if (isset($step['action_url'])) {
            $gather->addAttribute('action', $step['action_url']);
        } else {
            $webhook_url = home_url('/wp-json/twilio-webhook/v1/ivr-response');
            if (isset($step['workflow_id'])) {
                $webhook_url = add_query_arg('workflow_id', $step['workflow_id'], $webhook_url);
            }
            if (isset($step['id'])) {
                $webhook_url = add_query_arg('step_id', $step['id'], $webhook_url);
            }
            $gather->addAttribute('action', $webhook_url);
        }
        
        // Get message from either data array or direct property
        $message = null;
        if (isset($step['data']['message']) && !empty($step['data']['message'])) {
            $message = $step['data']['message'];
        } elseif (isset($step['message']) && !empty($step['message'])) {
            $message = $step['message'];
        } else {
            $message = 'Please select an option.';
        }
        
        // Check for new audio_type structure or legacy use_tts
        $audio_type = isset($step['data']['audio_type']) ? $step['data']['audio_type'] : 
                      (isset($step['audio_type']) ? $step['audio_type'] : 
                      (isset($step['data']['use_tts']) && $step['data']['use_tts'] ? 'tts' : 
                      (isset($step['use_tts']) && $step['use_tts'] ? 'tts' : 'say')));
        
        switch ($audio_type) {
            case 'tts':
                // Generate TTS audio
                $voice_id = isset($step['data']['voice_id']) ? $step['data']['voice_id'] : 
                           (isset($step['voice_id']) ? $step['voice_id'] : null);
                $audio_result = $elevenlabs->text_to_speech($message, [
                    'voice_id' => $voice_id
                ]);
                
                if ($audio_result['success']) {
                    $play = $gather->addChild('Play', $audio_result['file_url']);
                } else {
                    // Fallback to Say
                    $say = $gather->addChild('Say', $message);
                    $say->addAttribute('voice', 'alice');
                }
                break;
                
            case 'audio':
                // Use provided audio file
                $audio_url = isset($step['data']['audio_url']) ? $step['data']['audio_url'] : 
                            (isset($step['audio_url']) ? $step['audio_url'] : null);
                            
                if ($audio_url && !empty($audio_url)) {
                    $play = $gather->addChild('Play', $audio_url);
                } else {
                    // Fallback to Say if no audio URL provided
                    $say = $gather->addChild('Say', $message);
                    $say->addAttribute('voice', 'alice');
                }
                break;
                
            default: // 'say' or fallback
                $say = $gather->addChild('Say', $message);
                $say->addAttribute('voice', 'alice');
                break;
        }
        
        // Fallback if no input
        if (isset($step['no_input_action'])) {
            switch ($step['no_input_action']) {
                case 'repeat':
                    $redirect = $twiml->addChild('Redirect');
                    break;
                    
                case 'hangup':
                    $say = $twiml->addChild('Say', 'Goodbye');
                    $say->addAttribute('voice', 'alice');
                    $twiml->addChild('Hangup');
                    break;
                    
                case 'forward':
                    if (isset($step['forward_number'])) {
                        $dial = $twiml->addChild('Dial');
                        $dial->addAttribute('answerOnBridge', 'true');
                        $dial->addChild('Number', $step['forward_number']);
                    }
                    break;
            }
        }
        
        return $twiml->asXML();
    }
    
    /**
     * Create browser call TwiML
     */
    private static function create_browser_call_twiml($step, $elevenlabs) {
        $step_data = $step['data'];
        $twiml = new SimpleXMLElement('<?xml version="1.0" encoding="UTF-8"?><Response></Response>');
        
        // Get announcement message
        $message = '';
        if (isset($step_data['announce_message']) && !empty($step_data['announce_message'])) {
            $message = $step_data['announce_message'];
        } else {
            $message = 'Connecting you to our agent.';
        }
        
        // Handle audio type for announcement
        $audio_type = isset($step_data['audio_type']) ? $step_data['audio_type'] : 'say';
        
        switch ($audio_type) {
            case 'tts':
                $voice_id = isset($step_data['voice_id']) ? $step_data['voice_id'] : null;
                $audio_result = $elevenlabs->text_to_speech($message, [
                    'voice_id' => $voice_id
                ]);
                
                if ($audio_result['success']) {
                    $play = $twiml->addChild('Play', $audio_result['file_url']);
                } else {
                    $say = $twiml->addChild('Say', $message);
                    $say->addAttribute('voice', 'alice');
                }
                break;
                
            case 'audio':
                $audio_url = isset($step_data['audio_url']) ? $step_data['audio_url'] : null;
                            
                if ($audio_url && !empty($audio_url)) {
                    $play = $twiml->addChild('Play', $audio_url);
                } else {
                    $say = $twiml->addChild('Say', $message);
                    $say->addAttribute('voice', 'alice');
                }
                break;
                
            default: // 'say'
                $say = $twiml->addChild('Say', $message);
                $say->addAttribute('voice', 'alice');
                break;
        }
        
        // Dial browser clients
        $dial = $twiml->addChild('Dial');
        $dial->addAttribute('timeout', '30');
        
        // Get browser client names (agents who might be online)
        $browser_clients = isset($step_data['browser_clients']) ? $step_data['browser_clients'] : [];
        
        if (empty($browser_clients)) {
            // Default: try to call any available browser clients
            // Get all users with agent capabilities
            $agents = get_users(array(
                'meta_key' => 'twp_phone_number',
                'meta_compare' => 'EXISTS'
            ));
            
            foreach ($agents as $agent) {
                $client_name = 'agent_' . $agent->ID . '_' . sanitize_title($agent->display_name);
                $client = $dial->addChild('Client', $client_name);
            }
        } else {
            // Call specific browser clients
            foreach ($browser_clients as $client_name) {
                $client = $dial->addChild('Client', $client_name);
            }
        }
        
        // Add fallback if no browser clients answer
        $action_url = home_url('/wp-json/twilio-webhook/v1/browser-fallback');
        $dial->addAttribute('action', $action_url);
        $dial->addAttribute('method', 'POST');
        
        return $twiml->asXML();
    }
    
    /**
     * Create forward TwiML
     */
    private static function create_forward_twiml($step) {
        $twiml = new SimpleXMLElement('<?xml version="1.0" encoding="UTF-8"?><Response></Response>');
        
        $dial = $twiml->addChild('Dial');
        $dial->addAttribute('answerOnBridge', 'true');
        
        if (isset($step['timeout'])) {
            $dial->addAttribute('timeout', $step['timeout']);
        }
        
        if (isset($step['forward_numbers']) && is_array($step['forward_numbers'])) {
            // Sequential forwarding
            foreach ($step['forward_numbers'] as $number) {
                $dial->addChild('Number', $number);
            }
        } elseif (isset($step['forward_number'])) {
            $dial->addChild('Number', $step['forward_number']);
        }
        
        return $twiml->asXML();
    }
    
    /**
     * Create queue TwiML
     */
    private static function create_queue_twiml($step, $elevenlabs) {
        error_log('TWP Workflow: Creating queue TwiML with step data: ' . print_r($step, true));
        
        $twiml = new SimpleXMLElement('<?xml version="1.0" encoding="UTF-8"?><Response></Response>');
        
        // Check if data is nested (workflow steps have data nested)
        $step_data = isset($step['data']) ? $step['data'] : $step;
        
        // Get the actual queue name from the database if we have a queue_id
        $queue_name = '';
        $queue_id = null;
        
        if (isset($step_data['queue_id']) && !empty($step_data['queue_id'])) {
            $queue_id = $step_data['queue_id'];
            error_log('TWP Workflow: Looking up queue with ID: ' . $queue_id);
            $queue = TWP_Call_Queue::get_queue($queue_id);
            if ($queue) {
                $queue_name = $queue->queue_name;
                error_log('TWP Workflow: Found queue name: ' . $queue_name);
            } else {
                error_log('TWP Workflow: Queue not found in database for ID: ' . $queue_id);
            }
        } elseif (isset($step_data['queue_name']) && !empty($step_data['queue_name'])) {
            // Fallback to queue_name if provided directly
            $queue_name = $step_data['queue_name'];
            error_log('TWP Workflow: Using queue_name directly: ' . $queue_name);
        } else {
            error_log('TWP Workflow: No queue_id or queue_name in step data');
        }
        
        // Log error if no queue name found
        if (empty($queue_name)) {
            error_log('TWP Workflow: ERROR - Queue name is empty after lookup');
            // Return error message instead of empty queue
            $say = $twiml->addChild('Say', 'Sorry, the queue is not configured properly. Please try again later.');
            $say->addAttribute('voice', 'alice');
            return $twiml->asXML();
        }
        
        error_log('TWP Workflow: Using queue name for Enqueue: ' . $queue_name);
        
        // Add call to queue database BEFORE generating Enqueue TwiML
        // Get call info from current request context or call_data parameter
        $call_sid = isset($_POST['CallSid']) ? $_POST['CallSid'] : 
                   (isset($_REQUEST['CallSid']) ? $_REQUEST['CallSid'] : 
                   (isset($GLOBALS['call_data']['CallSid']) ? $GLOBALS['call_data']['CallSid'] : ''));
        $from_number = isset($_POST['From']) ? $_POST['From'] : 
                      (isset($_REQUEST['From']) ? $_REQUEST['From'] : 
                      (isset($GLOBALS['call_data']['From']) ? $GLOBALS['call_data']['From'] : ''));
        $to_number = isset($_POST['To']) ? $_POST['To'] : 
                    (isset($_REQUEST['To']) ? $_REQUEST['To'] : 
                    (isset($GLOBALS['call_data']['To']) ? $GLOBALS['call_data']['To'] : ''));
        
        error_log('TWP Queue: Call data - SID: ' . $call_sid . ', From: ' . $from_number . ', To: ' . $to_number);
        
        if ($call_sid && $queue_id) {
            error_log('TWP Workflow: Adding call to queue database - CallSid: ' . $call_sid . ', Queue ID: ' . $queue_id);
            $add_result = TWP_Call_Queue::add_to_queue($queue_id, array(
                'call_sid' => $call_sid,
                'from_number' => $from_number,
                'to_number' => $to_number
            ));
            error_log('TWP Workflow: Add to queue result: ' . ($add_result ? 'success' : 'failed'));
        } else {
            error_log('TWP Workflow: Cannot add to queue - missing CallSid (' . $call_sid . ') or queue_id (' . $queue_id . ')');
        }
        
        // Instead of using Twilio's Enqueue, redirect to our queue wait handler
        // This gives us complete control over the queue experience
        
        // Get announcement message
        $message = '';
        if (isset($step_data['announce_message']) && !empty($step_data['announce_message'])) {
            $message = $step_data['announce_message'];
        } else {
            $message = 'Please hold while we connect you to the next available agent.';
        }
        
        // Handle audio type for queue announcement (same logic as other steps)
        $audio_type = isset($step_data['audio_type']) ? $step_data['audio_type'] : 'say';
        
        switch ($audio_type) {
            case 'tts':
                // Generate TTS audio
                $voice_id = isset($step_data['voice_id']) ? $step_data['voice_id'] : null;
                $audio_result = $elevenlabs->text_to_speech($message, [
                    'voice_id' => $voice_id
                ]);
                
                if ($audio_result['success']) {
                    $play = $twiml->addChild('Play', $audio_result['file_url']);
                } else {
                    // Fallback to Say
                    $say = $twiml->addChild('Say', $message);
                    $say->addAttribute('voice', 'alice');
                }
                break;
                
            case 'audio':
                // Use provided audio file
                $audio_url = isset($step_data['audio_url']) ? $step_data['audio_url'] : null;
                            
                if ($audio_url && !empty($audio_url)) {
                    $play = $twiml->addChild('Play', $audio_url);
                } else {
                    // Fallback to Say if no audio URL provided
                    $say = $twiml->addChild('Say', $message);
                    $say->addAttribute('voice', 'alice');
                }
                break;
                
            default: // 'say'
                $say = $twiml->addChild('Say', $message);
                $say->addAttribute('voice', 'alice');
                break;
        }
        
        // Build the redirect URL properly
        $wait_url = home_url('/wp-json/twilio-webhook/v1/queue-wait');
        $wait_url = add_query_arg(array(
            'queue_id' => $queue_id,
            'call_sid' => urlencode($call_sid)  // URL encode to handle special characters
        ), $wait_url);
        
        // Set the text content of Redirect element properly
        $redirect = $twiml->addChild('Redirect');
        $redirect[0] = $wait_url;  // Set the URL as the text content
        $redirect->addAttribute('method', 'POST');
        
        error_log('TWP Workflow: Redirecting to custom queue wait handler: ' . $wait_url);
        
        $result = $twiml->asXML();
        error_log('TWP Workflow: Final Queue TwiML: ' . $result);
        
        return $result;
    }
    
    /**
     * Create ring group TwiML
     */
    private static function create_ring_group_twiml($step) {
        $twiml = new SimpleXMLElement('<?xml version="1.0" encoding="UTF-8"?><Response></Response>');
        
        if (isset($step['announce_message'])) {
            $say = $twiml->addChild('Say', $step['announce_message']);
            $say->addAttribute('voice', 'alice');
        }
        
        // Get group phone numbers
        $group_id = intval($step['group_id']);
        $phone_numbers = TWP_Agent_Groups::get_group_phone_numbers($group_id);
        
        if (empty($phone_numbers)) {
            $say = $twiml->addChild('Say', 'No agents are available in this group. Please try again later.');
            $say->addAttribute('voice', 'alice');
            $twiml->addChild('Hangup');
            return $twiml->asXML();
        }
        
        $dial = $twiml->addChild('Dial');
        $dial->addAttribute('answerOnBridge', 'true');
        
        if (isset($step['timeout'])) {
            $dial->addAttribute('timeout', $step['timeout']);
        } else {
            $dial->addAttribute('timeout', '30');
        }
        
        if (isset($step['caller_id'])) {
            $dial->addAttribute('callerId', $step['caller_id']);
        }
        
        // Set action URL to handle no-answer scenarios
        $action_url = home_url('/wp-json/twilio-webhook/v1/ring-group-result?' . http_build_query([
            'group_id' => $group_id,
            'queue_name' => isset($step['queue_name']) ? $step['queue_name'] : null,
            'fallback_action' => isset($step['fallback_action']) ? $step['fallback_action'] : 'queue'
        ]));
        $dial->addAttribute('action', $action_url);
        
        // Add all group numbers for simultaneous ring
        foreach ($phone_numbers as $number) {
            if (!empty($number)) {
                $dial->addChild('Number', $number);
            }
        }
        
        return $twiml->asXML();
    }
    
    /**
     * Create voicemail TwiML
     */
    private static function create_voicemail_twiml($step, $elevenlabs) {
        $twiml = new SimpleXMLElement('<?xml version="1.0" encoding="UTF-8"?><Response></Response>');
        
        // Debug logging
        error_log('TWP Voicemail Step Data: ' . json_encode($step));
        
        // Check for greeting message in different possible field names
        // The step data might be nested in a 'data' object
        $greeting = null;
        if (isset($step['data']['greeting_message']) && !empty($step['data']['greeting_message'])) {
            $greeting = $step['data']['greeting_message'];
            error_log('TWP Voicemail: Using data.greeting_message: ' . $greeting);
        } elseif (isset($step['greeting_message']) && !empty($step['greeting_message'])) {
            $greeting = $step['greeting_message'];
            error_log('TWP Voicemail: Using greeting_message: ' . $greeting);
        } elseif (isset($step['data']['message']) && !empty($step['data']['message'])) {
            $greeting = $step['data']['message'];
            error_log('TWP Voicemail: Using data.message: ' . $greeting);
        } elseif (isset($step['message']) && !empty($step['message'])) {
            $greeting = $step['message'];
            error_log('TWP Voicemail: Using message: ' . $greeting);
        } elseif (isset($step['data']['prompt']) && !empty($step['data']['prompt'])) {
            $greeting = $step['data']['prompt'];
            error_log('TWP Voicemail: Using data.prompt: ' . $greeting);
        } elseif (isset($step['prompt']) && !empty($step['prompt'])) {
            $greeting = $step['prompt'];
            error_log('TWP Voicemail: Using prompt: ' . $greeting);
        } elseif (isset($step['data']['text']) && !empty($step['data']['text'])) {
            $greeting = $step['data']['text'];
            error_log('TWP Voicemail: Using data.text: ' . $greeting);
        } elseif (isset($step['text']) && !empty($step['text'])) {
            $greeting = $step['text'];
            error_log('TWP Voicemail: Using text: ' . $greeting);
        }
        
        // Add greeting message if provided
        if ($greeting) {
            error_log('TWP Voicemail: Found greeting: ' . $greeting);
            
            // Check for new audio_type structure or legacy use_tts
            $audio_type = isset($step['data']['audio_type']) ? $step['data']['audio_type'] : 
                         (isset($step['audio_type']) ? $step['audio_type'] : 
                         (isset($step['data']['use_tts']) && $step['data']['use_tts'] ? 'tts' : 
                         (isset($step['use_tts']) && $step['use_tts'] ? 'tts' : 'say')));
            error_log('TWP Voicemail: audio_type = ' . $audio_type);
            
            switch ($audio_type) {
                case 'tts':
                    error_log('TWP Voicemail: Attempting ElevenLabs TTS');
                    // Check for voice_id in data object or root
                    $voice_id = isset($step['data']['voice_id']) && !empty($step['data']['voice_id']) ? $step['data']['voice_id'] : 
                               (isset($step['voice_id']) && !empty($step['voice_id']) ? $step['voice_id'] : null);
                    error_log('TWP Voicemail: voice_id = ' . ($voice_id ?: 'default'));
                    $audio_result = $elevenlabs->text_to_speech($greeting, [
                        'voice_id' => $voice_id
                    ]);
                    
                    if ($audio_result && isset($audio_result['success']) && $audio_result['success']) {
                        error_log('TWP Voicemail: ElevenLabs TTS successful, using audio file: ' . $audio_result['file_url']);
                        $play = $twiml->addChild('Play', $audio_result['file_url']);
                    } else {
                        error_log('TWP Voicemail: ElevenLabs TTS failed, falling back to Say: ' . json_encode($audio_result));
                        $say = $twiml->addChild('Say', $greeting);
                        $say->addAttribute('voice', 'alice');
                    }
                    break;
                    
                case 'audio':
                    // Use provided audio file
                    $audio_url = isset($step['data']['audio_url']) ? $step['data']['audio_url'] : 
                                (isset($step['audio_url']) ? $step['audio_url'] : null);
                    
                    if ($audio_url && !empty($audio_url)) {
                        error_log('TWP Voicemail: Using audio file: ' . $audio_url);
                        $play = $twiml->addChild('Play', $audio_url);
                    } else {
                        error_log('TWP Voicemail: No audio URL provided, falling back to Say');
                        $say = $twiml->addChild('Say', $greeting);
                        $say->addAttribute('voice', 'alice');
                    }
                    break;
                    
                default: // 'say' or fallback
                    error_log('TWP Voicemail: Using standard Say for greeting');
                    $say = $twiml->addChild('Say', $greeting);
                    $say->addAttribute('voice', 'alice');
                    break;
            }
        } else {
            error_log('TWP Voicemail: No custom greeting found, using default');
            // Default greeting if none provided
            $say = $twiml->addChild('Say', 'Please leave your message after the beep. Press the pound key when finished.');
            $say->addAttribute('voice', 'alice');
        }
        
        $record = $twiml->addChild('Record');
        $record->addAttribute('maxLength', isset($step['max_length']) ? $step['max_length'] : '120');
        $record->addAttribute('playBeep', 'true');
        $record->addAttribute('finishOnKey', '#');
        $record->addAttribute('timeout', '10');
        
        // Add action URL to handle what happens after recording
        $action_url = home_url('/wp-json/twilio-webhook/v1/voicemail-complete');
        $record->addAttribute('action', $action_url);
        
        // Add recording status callback for saving the voicemail
        $callback_url = home_url('/wp-json/twilio-webhook/v1/voicemail-callback');
        if (isset($step['workflow_id'])) {
            $callback_url = add_query_arg('workflow_id', $step['workflow_id'], $callback_url);
        }
        $record->addAttribute('recordingStatusCallback', $callback_url);
        $record->addAttribute('recordingStatusCallbackMethod', 'POST');
        
        // Add transcription (enabled by default unless explicitly disabled)
        if (!isset($step['transcribe']) || $step['transcribe'] !== false) {
            $record->addAttribute('transcribe', 'true');
            $record->addAttribute('transcribeCallback', home_url('/wp-json/twilio-webhook/v1/transcription'));
        }
        
        $twiml_output = $twiml->asXML();
        error_log('TWP Voicemail: Generated TwiML: ' . $twiml_output);
        return $twiml_output;
    }
    
    /**
     * Handle schedule check
     */
    private static function handle_schedule_check($step, $call_data) {
        $schedule_id = $step['data']['schedule_id'] ?? $step['schedule_id'] ?? null;
        
        error_log('TWP Schedule Check: Processing schedule check with ID: ' . ($schedule_id ?: 'none'));
        error_log('TWP Schedule Check: Step data: ' . json_encode($step));
        
        if (!$schedule_id) {
            error_log('TWP Schedule Check: No schedule ID specified, continuing to next step');
            // No schedule specified, return false to continue to next step
            return false;
        }
        
        // Check if we're within business hours first
        $is_active = TWP_Scheduler::is_schedule_active($schedule_id);
        error_log('TWP Schedule Check: Schedule active status: ' . ($is_active ? 'true' : 'false'));
        
        if ($is_active) {
            error_log('TWP Schedule Check: Within business hours, continuing to next workflow step');
            // Within business hours - continue with normal workflow
            return false; // Continue to next workflow step
        } else {
            error_log('TWP Schedule Check: Outside business hours, checking for after-hours steps');
            // After hours - execute after-hours steps
            $after_hours_steps = null;
            
            if (isset($step['data']['after_hours_steps']) && !empty($step['data']['after_hours_steps'])) {
                $after_hours_steps = $step['data']['after_hours_steps'];
            } elseif (isset($step['after_hours_steps']) && !empty($step['after_hours_steps'])) {
                $after_hours_steps = $step['after_hours_steps'];
            }
            
            if ($after_hours_steps) {
                error_log('TWP Schedule Check: Found after-hours steps, executing: ' . json_encode($after_hours_steps));
                return self::execute_after_hours_steps($after_hours_steps, $call_data);
            } else {
                error_log('TWP Schedule Check: No after-hours steps configured');
                
                // Fall back to schedule routing if no after-hours steps in workflow
                $routing = TWP_Scheduler::get_schedule_routing($schedule_id);
                
                if ($routing['action'] === 'workflow' && $routing['data']['workflow_id']) {
                    error_log('TWP Schedule Check: Using schedule routing to workflow: ' . $routing['data']['workflow_id']);
                    // Route to different workflow
                    $workflow_id = $routing['data']['workflow_id'];
                    $workflow = self::get_workflow($workflow_id);
                    
                    if ($workflow && $workflow->is_active) {
                        return self::execute_workflow($workflow_id, $call_data);
                    }
                } else if ($routing['action'] === 'forward' && $routing['data']['forward_number']) {
                    error_log('TWP Schedule Check: Using schedule routing to forward: ' . $routing['data']['forward_number']);
                    // Forward call
                    $twiml = new \Twilio\TwiML\VoiceResponse();
                    $twiml->dial($routing['data']['forward_number']);
                    return $twiml->asXML();
                }
            }
        }
        
        error_log('TWP Schedule Check: No action taken, continuing to next step');
        return false;
    }
    
    /**
     * Execute after-hours steps
     */
    private static function execute_after_hours_steps($steps, $call_data) {
        $twiml = new SimpleXMLElement('<?xml version="1.0" encoding="UTF-8"?><Response></Response>');
        
        foreach ($steps as $step) {
            switch ($step['type']) {
                case 'greeting':
                    if (isset($step['message']) && !empty($step['message'])) {
                        $say = $twiml->addChild('Say', $step['message']);
                        $say->addAttribute('voice', 'alice');
                    }
                    break;
                    
                case 'forward':
                    if (isset($step['number']) && !empty($step['number'])) {
                        $dial = $twiml->addChild('Dial');
                        $dial->addAttribute('answerOnBridge', 'true');
                        $dial->addChild('Number', $step['number']);
                        return $twiml->asXML(); // End here for forward
                    }
                    break;
                    
                case 'voicemail':
                    // Add greeting if provided
                    if (isset($step['greeting']) && !empty($step['greeting'])) {
                        $say = $twiml->addChild('Say', $step['greeting']);
                        $say->addAttribute('voice', 'alice');
                    }
                    
                    // Add record
                    $record = $twiml->addChild('Record');
                    $record->addAttribute('maxLength', '120');
                    $record->addAttribute('playBeep', 'true');
                    $record->addAttribute('finishOnKey', '#');
                    $record->addAttribute('timeout', '10');
                    $record->addAttribute('action', home_url('/wp-json/twilio-webhook/v1/voicemail-complete'));
                    $record->addAttribute('recordingStatusCallback', home_url('/wp-json/twilio-webhook/v1/voicemail-callback'));
                    $record->addAttribute('recordingStatusCallbackMethod', 'POST');
                    $record->addAttribute('transcribe', 'true');
                    $record->addAttribute('transcribeCallback', home_url('/wp-json/twilio-webhook/v1/transcription'));
                    return $twiml->asXML(); // End here for voicemail
                    
                case 'queue':
                    if (isset($step['queue_name']) && !empty($step['queue_name'])) {
                        $enqueue = $twiml->addChild('Enqueue', $step['queue_name']);
                        return $twiml->asXML(); // End here for queue
                    }
                    break;
                    
                case 'sms':
                    if (isset($step['to_number']) && !empty($step['to_number']) && 
                        isset($step['message']) && !empty($step['message'])) {
                        // Send SMS notification
                        $twilio = new TWP_Twilio_API();
                        
                        // Get the from number using proper priority
                        $workflow_id = isset($step['workflow_id']) ? $step['workflow_id'] : null;
                        $from_number = TWP_Twilio_API::get_sms_from_number($workflow_id);
                        
                        $message = str_replace(
                            array('{from}', '{to}', '{time}'),
                            array($call_data['From'], $call_data['To'], current_time('g:i A')),
                            $step['message']
                        );
                        $twilio->send_sms($step['to_number'], $message, $from_number);
                    }
                    break;
            }
        }
        
        return $twiml->asXML();
    }
    
    /**
     * Execute action
     */
    private static function execute_action($action, $call_data) {
        switch ($action['type']) {
            case 'forward':
                return self::create_forward_twiml($action);
                
            case 'voicemail':
                $elevenlabs = new TWP_ElevenLabs_API();
                return self::create_voicemail_twiml($action, $elevenlabs);
                
            case 'queue':
                return self::create_queue_twiml($action);
                
            case 'ring_group':
                return self::create_ring_group_twiml($action);
                
            case 'message':
                $twiml = new SimpleXMLElement('<?xml version="1.0" encoding="UTF-8"?><Response></Response>');
                $say = $twiml->addChild('Say', $action['message']);
                $say->addAttribute('voice', 'alice');
                return $twiml->asXML();
                
            default:
                return false;
        }
    }
    
    /**
     * Check conditions
     */
    private static function check_conditions($conditions, $call_data) {
        foreach ($conditions as $condition) {
            switch ($condition['type']) {
                case 'time':
                    $current_time = current_time('H:i');
                    if ($current_time < $condition['start_time'] || $current_time > $condition['end_time']) {
                        return false;
                    }
                    break;
                    
                case 'day_of_week':
                    $current_day = strtolower(date('l'));
                    if (!in_array($current_day, $condition['days'])) {
                        return false;
                    }
                    break;
                    
                case 'caller_id':
                    if (!in_array($call_data['From'], $condition['numbers'])) {
                        return false;
                    }
                    break;
            }
        }
        
        return true;
    }
    
    /**
     * Send SMS notification
     */
    private static function send_sms_notification($step, $call_data) {
        $twilio = new TWP_Twilio_API();
        
        // Get the from number - priority: workflow phone > default SMS number > first Twilio number
        $workflow_id = isset($step['workflow_id']) ? $step['workflow_id'] : null;
        $from_number = TWP_Twilio_API::get_sms_from_number($workflow_id);
        
        $message = str_replace(
            array('{from}', '{to}', '{time}'),
            array($call_data['From'], $call_data['To'], current_time('g:i A')),
            $step['message']
        );
        
        $twilio->send_sms($step['to_number'], $message, $from_number);
    }
    
    /**
     * Create default response
     */
    private static function create_default_response() {
        $twiml = new SimpleXMLElement('<?xml version="1.0" encoding="UTF-8"?><Response></Response>');
        $say = $twiml->addChild('Say', 'Thank you for calling. Goodbye.');
        $say->addAttribute('voice', 'alice');
        $twiml->addChild('Hangup');
        
        return $twiml->asXML();
    }
    
    /**
     * Get workflow
     */
    public static function get_workflow($workflow_id) {
        global $wpdb;
        $table_name = $wpdb->prefix . 'twp_workflows';
        
        return $wpdb->get_row($wpdb->prepare(
            "SELECT * FROM $table_name WHERE id = %d",
            $workflow_id
        ));
    }
    
    /**
     * Get workflows
     */
    public static function get_workflows() {
        global $wpdb;
        $table_name = $wpdb->prefix . 'twp_workflows';
        
        return $wpdb->get_results("SELECT * FROM $table_name ORDER BY created_at DESC");
    }
    
    /**
     * Get workflow by phone number
     */
    public static function get_workflow_by_phone_number($phone_number) {
        global $wpdb;
        $table_name = $wpdb->prefix . 'twp_workflows';
        
        return $wpdb->get_row($wpdb->prepare(
            "SELECT * FROM $table_name WHERE phone_number = %s AND is_active = 1 ORDER BY created_at DESC LIMIT 1",
            $phone_number
        ));
    }
    
    /**
     * Update workflow
     */
    public static function update_workflow($workflow_id, $data) {
        global $wpdb;
        $table_name = $wpdb->prefix . 'twp_workflows';
        
        $update_data = array();
        $update_format = array();
        
        if (isset($data['workflow_name'])) {
            $update_data['workflow_name'] = sanitize_text_field($data['workflow_name']);
            $update_format[] = '%s';
        }
        
        if (isset($data['phone_number'])) {
            $update_data['phone_number'] = sanitize_text_field($data['phone_number']);
            $update_format[] = '%s';
        }
        
        if (isset($data['workflow_data'])) {
            // Check if workflow_data is already JSON string or needs encoding
            if (is_string($data['workflow_data'])) {
                $update_data['workflow_data'] = $data['workflow_data'];
            } else {
                $update_data['workflow_data'] = json_encode($data['workflow_data']);
            }
            $update_format[] = '%s';
        }
        
        if (isset($data['is_active'])) {
            $update_data['is_active'] = $data['is_active'] ? 1 : 0;
            $update_format[] = '%d';
        }
        
        return $wpdb->update(
            $table_name,
            $update_data,
            array('id' => $workflow_id),
            $update_format,
            array('%d')
        );
    }
    
    /**
     * Delete workflow
     */
    public static function delete_workflow($workflow_id) {
        global $wpdb;
        $table_name = $wpdb->prefix . 'twp_workflows';
        
        return $wpdb->delete(
            $table_name,
            array('id' => $workflow_id),
            array('%d')
        );
    }
}