/**
 * Frontend Browser Phone for TWP Plugin
 * Mobile-friendly implementation
 */
(function($) {
    'use strict';
    
    let twilioDevice = null;
    let currentCall = null;
    let callTimer = null;
    let callStartTime = null;
    let isConnected = false;
    let availableNumbers = [];
    let userQueues = [];
    let selectedQueue = null;
    let tokenRefreshTimer = null;
    let tokenExpiry = null;
    let queuePollingTimer = null;
    let lastQueueUpdate = {};
    let alertSound = null;
    let alertInterval = null;
    let alertEnabled = false;
    let notificationPermission = 'default';
    let backgroundAlertInterval = null;
    let isPageVisible = true;
    let isOnHold = false;
    let isRecording = false;
    let recordingSid = null;
    let personalQueueTimer = null;
    let personalQueueName = null;
    
    // Initialize when document is ready
    $(document).ready(function() {
        if (!twp_frontend_ajax.is_logged_in) {
            showMessage('You must be logged in to use the browser phone.', 'error');
            return;
        }
        
        initializeBrowserPhone();
        bindEvents();
        loadPhoneNumbers();
        loadUserQueues();
        initVoicemailSection();
        initializeNotifications();
        initializePageVisibility();
        initializePersonalQueue();
    });
    
    /**
     * Wait for Twilio SDK to load
     */
    function waitForTwilioSDK(callback) {
        let attempts = 0;
        const maxAttempts = 150; // 15 seconds max (100ms * 150)
        
        function checkTwilio() {
            console.log('Checking Twilio SDK availability, attempt:', attempts + 1);
            
            if (typeof Twilio !== 'undefined' && Twilio.Device) {
                console.log('Twilio SDK loaded successfully');
                callback();
                return;
            }
            
            attempts++;
            
            // Update status message periodically
            if (attempts === 30) { // 3 seconds
                updateStatus('connecting', 'Loading Twilio SDK...');
            } else if (attempts === 60) { // 6 seconds  
                updateStatus('connecting', 'Still loading SDK...');
            } else if (attempts === 100) { // 10 seconds
                updateStatus('connecting', 'SDK taking longer than expected...');
            }
            
            if (attempts >= maxAttempts) {
                console.error('Twilio SDK failed to load. Window.Twilio:', typeof Twilio);
                updateStatus('offline', 'SDK load timeout');
                showMessage('Twilio SDK failed to load within 15 seconds. This may be due to a slow connection or network restrictions. Please refresh the page and try again.', 'error');
                return;
            }
            
            setTimeout(checkTwilio, 100);
        }
        
        checkTwilio();
    }
    
    /**
     * Initialize the browser phone
     */
    function initializeBrowserPhone() {
        updateStatus('connecting', 'Initializing...');
        
        // Wait for Twilio SDK to load, then initialize
        waitForTwilioSDK(function() {
            // Generate capability token
            $.ajax({
                url: twp_frontend_ajax.ajax_url,
                method: 'POST',
                data: {
                    action: 'twp_generate_capability_token',
                    nonce: twp_frontend_ajax.nonce
                },
                success: function(response) {
                    if (response.success) {
                        setupTwilioDevice(response.data.token);
                        // Set token expiry time (expires in 1 hour)
                        tokenExpiry = Date.now() + (response.data.expires_in || 3600) * 1000;
                        scheduleTokenRefresh();
                    } else {
                        updateStatus('offline', 'Failed to initialize');
                        showMessage('Failed to initialize browser phone: ' + (response.data || 'Unknown error'), 'error');
                    }
                },
                error: function() {
                    updateStatus('offline', 'Connection failed');
                    showMessage('Failed to connect to server', 'error');
                }
            });
        });
    }
    
    /**
     * Setup Twilio Device
     */
    // Request microphone and speaker permissions
    async function requestMediaPermissions() {
        try {
            console.log('Requesting media permissions...');
            
            // Request microphone permission
            const stream = await navigator.mediaDevices.getUserMedia({
                audio: true,
                video: false
            });
            
            // Stop the stream immediately as we just needed permission
            stream.getTracks().forEach(track => track.stop());
            
            console.log('Media permissions granted');
            return true;
        } catch (error) {
            console.error('Media permission denied or not available:', error);
            
            // Show user-friendly error message
            let errorMessage = 'Microphone access is required for browser phone functionality. ';
            
            if (error.name === 'NotAllowedError') {
                errorMessage += 'Please allow microphone access in your browser settings and refresh the page.';
            } else if (error.name === 'NotFoundError') {
                errorMessage += 'No microphone found. Please connect a microphone and try again.';
            } else {
                errorMessage += 'Please check your browser settings and try again.';
            }
            
            showMessage(errorMessage, 'error');
            updateStatus('offline', 'Permission denied');
            return false;
        }
    }

    async function setupTwilioDevice(token) {
        // Check if Twilio SDK is loaded
        if (typeof Twilio === 'undefined' || !Twilio.Device) {
            updateStatus('offline', 'Twilio SDK not loaded');
            showMessage('Twilio SDK failed to load. Please refresh the page.', 'error');
            console.error('Twilio SDK is not available');
            return;
        }
        
        // Request media permissions before setting up device
        const hasPermissions = await requestMediaPermissions();
        if (!hasPermissions) {
            return; // Stop setup if permissions denied
        }
        
        try {
            // If device already exists, destroy it first to prevent multiple connections
            if (twilioDevice) {
                twilioDevice.destroy();
                twilioDevice = null;
            }
            
            twilioDevice = new Twilio.Device(token, {
                logLevel: 1,
                answerOnBridge: true
            });
            
            twilioDevice.on('registered', function() {
                updateStatus('online', 'Ready');
                isConnected = true;
                // Only show success message on initial connection
                if (!tokenRefreshTimer) {
                    showMessage('Browser phone ready!', 'success');
                }
            });
            
            twilioDevice.on('error', function(error) {
                console.error('Twilio Device Error:', error);
                updateStatus('offline', 'Error: ' + error.message);
                showMessage('Device error: ' + error.message, 'error');
                
                // If token expired error, refresh immediately
                if (error.message && error.message.toLowerCase().includes('token')) {
                    refreshToken();
                }
            });
            
            twilioDevice.on('incoming', function(call) {
                handleIncomingCall(call);
            });
            
            twilioDevice.on('disconnect', function() {
                updateStatus('offline', 'Disconnected');
                isConnected = false;
            });
            
            // Register device asynchronously
            await twilioDevice.register();
            
        } catch (error) {
            console.error('Failed to setup Twilio Device:', error);
            updateStatus('offline', 'Setup failed');
            showMessage('Failed to setup device: ' + error.message, 'error');
        }
    }
    
    /**
     * Load available phone numbers
     */
    function loadPhoneNumbers() {
        $.ajax({
            url: twp_frontend_ajax.ajax_url,
            method: 'POST',
            data: {
                action: 'twp_get_phone_numbers',
                nonce: twp_frontend_ajax.nonce
            },
            success: function(response) {
                if (response.success && response.data) {
                    availableNumbers = response.data;
                    populateCallerIdSelect();
                } else {
                    showMessage('Failed to load phone numbers', 'error');
                }
            },
            error: function() {
                showMessage('Failed to load phone numbers', 'error');
            }
        });
    }
    
    /**
     * Populate caller ID select
     */
    function populateCallerIdSelect() {
        const $select = $('#twp-caller-id');
        $select.empty();
        
        if (availableNumbers.length === 0) {
            $select.append('<option value="">No numbers available</option>');
            return;
        }
        
        $select.append('<option value="">Select caller ID...</option>');
        
        availableNumbers.forEach(function(number) {
            const friendlyName = number.friendly_name || number.phone_number;
            $select.append(`<option value="${number.phone_number}">${friendlyName} (${number.phone_number})</option>`);
        });
    }
    
    /**
     * Bind event handlers
     */
    function bindEvents() {
        // Dial pad buttons
        $('.twp-dial-btn').on('click', function() {
            const digit = $(this).data('digit');
            addDigit(digit);
            
            // Haptic feedback on mobile
            if (navigator.vibrate) {
                navigator.vibrate(50);
            }
        });
        
        // Clear number button
        $('#twp-clear-number').on('click', function() {
            $('#twp-dial-number').val('');
        });
        
        // Call button
        $('#twp-call-btn').on('click', function() {
            if (!isConnected) {
                showMessage('Device not connected', 'error');
                return;
            }
            
            const number = $('#twp-dial-number').val().trim();
            const callerId = $('#twp-caller-id').val();
            
            if (!number) {
                showMessage('Please enter a number to call', 'error');
                return;
            }
            
            if (!callerId) {
                showMessage('Please select a caller ID', 'error');
                return;
            }
            
            makeCall(number, callerId);
        });
        
        // Hang up button
        $('#twp-hangup-btn').on('click', function() {
            hangupCall();
        });
        
        $('#twp-resume-btn').on('click', function() {
            toggleHold(); // Resume the call
        });
        
        // Call control buttons
        $('#twp-hold-btn').on('click', function() {
            toggleHold();
        });
        
        $('#twp-transfer-btn').on('click', function() {
            showTransferDialog();
        });
        
        $('#twp-requeue-btn').on('click', function() {
            showRequeueDialog();
        });
        
        $('#twp-record-btn').on('click', function() {
            toggleRecording();
        });
        
        // Transfer dialog handlers
        $(document).on('click', '#twp-confirm-transfer', function() {
            const agentNumber = $('#twp-transfer-agent-number').val();
            if (agentNumber) {
                transferCall(agentNumber);
            }
        });
        
        $(document).on('click', '#twp-cancel-transfer', function() {
            hideTransferDialog();
        });
        
        // Requeue dialog handlers
        $(document).on('click', '#twp-confirm-requeue', function() {
            const queueId = $('#twp-requeue-select').val();
            if (queueId) {
                requeueCall(queueId);
            }
        });
        
        $(document).on('click', '#twp-cancel-requeue', function() {
            hideRequeueDialog();
        });
        
        // Accept queue call button
        $('#twp-accept-queue-call').on('click', function() {
            acceptQueueCall();
            stopAlert(); // Stop alert when accepting call
        });
        
        // Refresh queues button
        $('#twp-refresh-queues').on('click', function() {
            loadUserQueues();
        });
        
        // Alert toggle button
        $(document).on('click', '#twp-alert-toggle', function() {
            toggleAlert();
        });
        
        // Voicemail refresh button
        $('#twp-refresh-voicemails').on('click', function() {
            loadUserVoicemails();
        });
        
        // View all voicemails button
        $('#twp-view-all-voicemails').on('click', function() {
            // Open admin voicemails page in new tab
            window.open(twp_frontend_ajax.admin_url + 'admin.php?page=twilio-wp-voicemails', '_blank');
        });
        
        // Voicemail toggle button
        $('#twp-voicemail-toggle').on('click', function() {
            toggleVoicemailSection();
        });
        
        // Voicemail header click (also toggles)
        $('#twp-voicemail-header').on('click', function(e) {
            // Don't toggle if clicking the toggle button itself
            if (!$(e.target).closest('.voicemail-toggle').length) {
                toggleVoicemailSection();
            }
        });
        
        // Voicemail item click handler
        $(document).on('click', '.voicemail-item', function() {
            const voicemailId = $(this).data('voicemail-id');
            playVoicemail(voicemailId);
        });
        
        // Queue item selection
        $(document).on('click', '.queue-item', function() {
            const queueId = $(this).data('queue-id');
            selectQueue(queueId);
        });
        
        // Manual number input
        $('#twp-dial-number').on('input', function() {
            // Only allow valid phone number characters
            let value = $(this).val().replace(/[^\d\+\-\(\)\s]/g, '');
            $(this).val(value);
        });
        
        // Handle enter key in dial number input
        $('#twp-dial-number').on('keypress', function(e) {
            if (e.which === 13) { // Enter key
                $('#twp-call-btn').click();
            }
        });
    }
    
    /**
     * Add digit to dial pad
     */
    function addDigit(digit) {
        const $input = $('#twp-dial-number');
        $input.val($input.val() + digit);
        
        // Send DTMF if in a call
        if (currentCall && currentCall.status() === 'open') {
            currentCall.sendDigits(digit);
        }
    }
    
    /**
     * Make outbound call
     */
    async function makeCall(number, callerId) {
        if (currentCall) {
            showMessage('Already in a call', 'error');
            return;
        }
        
        // Stop alerts when making a call
        stopAlert();
        
        updateCallState('connecting');
        showCallInfo('Connecting...');
        
        const params = {
            To: number,
            From: callerId
        };
        
        try {
            console.log('Making call with params:', params);
            currentCall = await twilioDevice.connect({params: params});
            
            // Setup call event handlers
            currentCall.on('accept', function() {
                updateCallState('connected');
                showCallInfo('Connected');
                startCallTimer();
                showMessage('Call connected!', 'success');
            });
            
            currentCall.on('disconnect', function() {
                endCall();
                showMessage('Call ended', 'info');
            });
            
            currentCall.on('error', function(error) {
                console.error('Call error:', error);
                endCall();
                showMessage('Call failed: ' + error.message, 'error');
            });
            
        } catch (error) {
            console.error('Failed to make call:', error);
            endCall();
            showMessage('Failed to make call: ' + error.message, 'error');
        }
    }
    
    /**
     * Handle incoming call
     */
    function handleIncomingCall(call) {
        currentCall = call;
        
        // Add visual indication
        $('.twp-browser-phone-container').addClass('incoming-call');
        
        updateCallState('ringing');
        showCallInfo('Incoming call from: ' + (call.parameters.From || 'Unknown'));
        showMessage('Incoming call! Click Accept to answer.', 'info');
        
        // Auto-answer after a delay (optional)
        setTimeout(function() {
            if (currentCall === call && call.status() === 'pending') {
                acceptCall();
            }
        }, 2000);
        
        call.on('accept', function() {
            $('.twp-browser-phone-container').removeClass('incoming-call');
            updateCallState('connected');
            showCallInfo('Connected');
            startCallTimer();
            showMessage('Call answered!', 'success');
        });
        
        call.on('disconnect', function() {
            $('.twp-browser-phone-container').removeClass('incoming-call');
            endCall();
            showMessage('Call ended', 'info');
        });
        
        call.on('error', function(error) {
            $('.twp-browser-phone-container').removeClass('incoming-call');
            endCall();
            showMessage('Call error: ' + error.message, 'error');
        });
    }
    
    /**
     * Accept incoming call
     */
    function acceptCall() {
        if (currentCall && currentCall.status() === 'pending') {
            currentCall.accept();
        }
    }
    
    /**
     * Hang up current call
     */
    function hangupCall() {
        if (currentCall) {
            currentCall.disconnect();
        }
        endCall();
    }
    
    /**
     * End call and cleanup
     */
    function endCall() {
        // Stop recording if active
        if (isRecording) {
            stopRecording();
        }
        
        currentCall = null;
        isOnHold = false;
        isRecording = false;
        recordingSid = null;
        stopCallTimer();
        updateCallState('idle');
        hideCallInfo();
        $('.twp-browser-phone-container').removeClass('incoming-call');
        
        // Reset control buttons
        console.log('endCall() called - resetting hold button from:', $('#twp-hold-btn').text());
        $('#twp-hold-btn').text('Hold').removeClass('btn-active');
        $('#twp-record-btn').text('Record').removeClass('btn-active');
        
        // Reset resume button
        const $resumeBtn = $('#twp-resume-btn');
        $resumeBtn.hide();
        
        // Restart alerts if enabled and there are waiting calls
        if (alertEnabled) {
            const hasWaitingCalls = userQueues.some(q => parseInt(q.current_waiting) > 0);
            if (hasWaitingCalls) {
                setTimeout(startAlert, 1000); // Small delay to avoid immediate alert
            }
        }
    }
    
    /**
     * Load user's assigned queues
     */
    function loadUserQueues(silent = false) {
        $.ajax({
            url: twp_frontend_ajax.ajax_url,
            method: 'POST',
            data: {
                action: 'twp_get_agent_queues',
                nonce: twp_frontend_ajax.nonce
            },
            success: function(response) {
                if (response.success) {
                    // Check for new calls in queues
                    checkForNewCalls(response.data);
                    userQueues = response.data;
                    displayQueues();
                } else if (!silent) {
                    showMessage('Failed to load queues: ' + (response.data || 'Unknown error'), 'error');
                }
            },
            error: function() {
                if (!silent) {
                    showMessage('Failed to load queues', 'error');
                }
            }
        });
    }
    
    /**
     * Check for new calls in queues and trigger alerts
     */
    function checkForNewCalls(newQueues) {
        let hasWaitingCalls = false;
        let newCallDetected = false;
        
        newQueues.forEach(function(queue) {
            const queueId = queue.id;
            const currentWaiting = parseInt(queue.current_waiting) || 0;
            const previousWaiting = lastQueueUpdate[queueId] || 0;
            
            // Track if any queue has waiting calls
            if (currentWaiting > 0) {
                hasWaitingCalls = true;
            }
            
            // If waiting count increased, we have new calls
            if (currentWaiting > previousWaiting) {
                console.log('New call detected in queue:', queue.queue_name);
                newCallDetected = true;
                
                // Show browser notification for new call
                if (notificationPermission === 'granted') {
                    showBrowserNotification('📞 New Call in Queue!', {
                        body: `${queue.queue_name}: ${currentWaiting} call${currentWaiting > 1 ? 's' : ''} waiting`,
                        icon: '📞',
                        vibrate: [300, 200, 300],
                        requireInteraction: true,
                        tag: `queue-${queue.id}`,
                        data: {
                            queueId: queue.id
                        }
                    });
                }
            }
            
            lastQueueUpdate[queueId] = currentWaiting;
        });
        
        // Manage alerts based on queue state
        if (alertEnabled && !currentCall) {
            if (newCallDetected) {
                // Start alert for new calls
                startAlert();
            } else if (!hasWaitingCalls) {
                // Stop alert if no calls are waiting in any queue
                console.log('No calls waiting in any queue, stopping alerts');
                stopAlert();
            }
        }
    }
    
    /**
     * Display queues in the UI
     */
    function displayQueues() {
        const $queueList = $('#twp-queue-list');
        
        if (userQueues.length === 0) {
            $queueList.html('<div class="no-queues">No queues assigned to you. <br><small>Personal queues will be created automatically.</small></div>');
            $('#twp-queue-section').hide();
            $('#twp-queue-global-actions').hide();
            return;
        }
        
        $('#twp-queue-section').show();
        $('#twp-queue-global-actions').show();
        
        let html = '';
        let userExtension = null;
        
        userQueues.forEach(function(queue) {
            const hasWaiting = parseInt(queue.current_waiting) > 0;
            const waitingCount = queue.current_waiting || 0;
            const queueType = queue.queue_type || 'general';
            
            // Extract user extension from personal queues
            if (queueType === 'personal' && queue.extension) {
                userExtension = queue.extension;
            }
            
            // Generate queue type indicator and description
            let typeIndicator = '';
            let typeDescription = '';
            if (queueType === 'personal') {
                typeIndicator = '👤';
                typeDescription = queue.extension ? ` (Ext: ${queue.extension})` : '';
            } else if (queueType === 'hold') {
                typeIndicator = '⏸️';
                typeDescription = ' (Hold)';
            } else {
                typeIndicator = '📋';
                typeDescription = ' (Team)';
            }
            
            html += `
                <div class="queue-item ${hasWaiting ? 'has-calls' : ''} queue-type-${queueType}" data-queue-id="${queue.id}">
                    <div class="queue-header">
                        <div class="queue-name">
                            <span class="queue-type-icon">${typeIndicator}</span>
                            ${queue.queue_name}${typeDescription}
                        </div>
                    </div>
                    <div class="queue-info">
                        <span class="queue-waiting ${hasWaiting ? 'has-calls' : ''}">
                            ${waitingCount} waiting
                        </span>
                        <span class="queue-capacity">
                            Max: ${queue.max_size}
                        </span>
                    </div>
                </div>
            `;
        });
        
        $queueList.html(html);
        
        // Show user extension in queue global actions if we found it
        if (userExtension) {
            const $globalActions = $('#twp-queue-global-actions .global-queue-actions');
            if ($globalActions.find('.user-extension-display').length === 0) {
                $globalActions.prepend(`<div class="user-extension-display">📞 Your Extension: <strong>${userExtension}</strong></div>`);
            }
        }
        
        // Auto-select first queue with calls, or first personal queue, or first queue
        const firstQueueWithCalls = userQueues.find(q => parseInt(q.current_waiting) > 0);
        const firstPersonalQueue = userQueues.find(q => q.queue_type === 'personal');
        const queueToSelect = firstQueueWithCalls || firstPersonalQueue || userQueues[0];
        if (queueToSelect) {
            selectQueue(queueToSelect.id);
        }
    }
    
    /**
     * Select a queue
     */
    function selectQueue(queueId) {
        selectedQueue = userQueues.find(q => q.id == queueId);
        
        if (!selectedQueue) return;
        
        // Update UI selection
        $('.queue-item').removeClass('selected');
        $(`.queue-item[data-queue-id="${queueId}"]`).addClass('selected');
        
        // Update queue controls
        $('#selected-queue-name').text(selectedQueue.queue_name);
        $('#twp-waiting-count').text(selectedQueue.current_waiting || 0);
        $('#twp-queue-max-size').text(selectedQueue.max_size);
        
        // Show queue controls if there are waiting calls
        if (parseInt(selectedQueue.current_waiting) > 0) {
            $('#twp-queue-controls').show();
        } else {
            $('#twp-queue-controls').hide();
        }
    }
    
    /**
     * Accept next call from selected queue
     */
    function acceptQueueCall() {
        if (!selectedQueue) {
            showMessage('Please select a queue first', 'error');
            return;
        }
        
        $.ajax({
            url: twp_frontend_ajax.ajax_url,
            method: 'POST',
            data: {
                action: 'twp_accept_next_queue_call',
                queue_id: selectedQueue.id,
                nonce: twp_frontend_ajax.nonce
            },
            success: function(response) {
                if (response.success) {
                    showMessage('Connecting to next caller...', 'info');
                    // Refresh queue data after accepting call
                    setTimeout(loadUserQueues, 1000);
                } else {
                    showMessage(response.data || 'No calls waiting in this queue', 'info');
                }
            },
            error: function() {
                showMessage('Failed to accept queue call', 'error');
            }
        });
    }
    
    /**
     * Update call state UI
     */
    function updateCallState(state) {
        const $callBtn = $('#twp-call-btn');
        const $hangupBtn = $('#twp-hangup-btn');
        const $resumeBtn = $('#twp-resume-btn');
        const $controlsPanel = $('#twp-call-controls-panel');
        
        switch (state) {
            case 'idle':
                $callBtn.show().prop('disabled', false);
                $hangupBtn.hide();
                $resumeBtn.hide();
                $controlsPanel.hide();
                break;
            case 'connecting':
            case 'ringing':
                $callBtn.hide();
                $hangupBtn.show();
                $resumeBtn.hide();
                $controlsPanel.hide();
                break;
            case 'connected':
                $callBtn.hide();
                $hangupBtn.show();
                $resumeBtn.hide(); // Will be shown by hold logic when needed
                $controlsPanel.show();
                break;
        }
    }
    
    /**
     * Show call info panel
     */
    function showCallInfo(status) {
        $('#twp-call-info').show();
        $('#twp-call-status').text(status);
    }
    
    /**
     * Hide call info panel
     */
    function hideCallInfo() {
        $('#twp-call-info').hide();
        $('#twp-call-timer').text('00:00');
        $('#twp-call-status').text('');
    }
    
    /**
     * Start call timer
     */
    function startCallTimer() {
        callStartTime = new Date();
        callTimer = setInterval(updateCallTimer, 1000);
        updateCallTimer();
    }
    
    /**
     * Stop call timer
     */
    function stopCallTimer() {
        if (callTimer) {
            clearInterval(callTimer);
            callTimer = null;
        }
        callStartTime = null;
    }
    
    /**
     * Update call timer display
     */
    function updateCallTimer() {
        if (!callStartTime) return;
        
        const elapsed = Math.floor((new Date() - callStartTime) / 1000);
        const minutes = Math.floor(elapsed / 60);
        const seconds = elapsed % 60;
        
        const timeString = String(minutes).padStart(2, '0') + ':' + String(seconds).padStart(2, '0');
        $('#twp-call-timer').text(timeString);
    }
    
    /**
     * Update connection status
     */
    function updateStatus(status, text) {
        const $indicator = $('#twp-status-indicator');
        const $text = $('#twp-status-text');
        
        $indicator.removeClass('offline connecting online').addClass(status);
        $text.text(text);
    }
    
    /**
     * Show message to user
     */
    function showMessage(message, type) {
        const $messages = $('#twp-messages');
        const $message = $('<div>').addClass('twp-' + type).text(message);
        
        $messages.empty().append($message);
        
        // Auto-hide success and info messages
        if (type === 'success' || type === 'info') {
            setTimeout(function() {
                $message.fadeOut(function() {
                    $message.remove();
                });
            }, 5000);
        }
    }
    
    // Start queue polling with faster interval
    startQueuePolling();
    
    /**
     * Start polling for queue updates
     */
    function startQueuePolling() {
        // Clear any existing timer
        if (queuePollingTimer) {
            clearInterval(queuePollingTimer);
        }
        
        // Poll every 5 seconds for real-time updates
        queuePollingTimer = setInterval(function() {
            if (isConnected) {
                loadUserQueues(true); // Silent update
            }
        }, 5000); // Every 5 seconds
    }
    
    /**
     * Schedule token refresh
     * Refreshes token 10 minutes before expiry for safety
     */
    function scheduleTokenRefresh() {
        // Clear any existing timer
        if (tokenRefreshTimer) {
            clearTimeout(tokenRefreshTimer);
        }
        
        if (!tokenExpiry) {
            console.error('Token expiry time not set');
            // Retry in 30 seconds if token expiry not set
            setTimeout(function() {
                if (tokenExpiry) {
                    scheduleTokenRefresh();
                }
            }, 30000);
            return;
        }
        
        // Calculate time until refresh (10 minutes before expiry for extra safety)
        const refreshBuffer = 10 * 60 * 1000; // 10 minutes in milliseconds
        const timeUntilRefresh = tokenExpiry - Date.now() - refreshBuffer;
        
        if (timeUntilRefresh <= 0) {
            // Token needs refresh immediately
            refreshToken();
        } else {
            // Schedule refresh
            console.log('Scheduling token refresh in', Math.round(timeUntilRefresh / 1000), 'seconds');
            tokenRefreshTimer = setTimeout(refreshToken, timeUntilRefresh);
        }
    }
    
    /**
     * Refresh the capability token
     */
    function refreshToken() {
        console.log('Refreshing capability token...');
        
        // Don't refresh if currently in a call
        if (currentCall) {
            console.log('Currently in call, postponing token refresh');
            // Retry in 1 minute
            setTimeout(refreshToken, 60000);
            return;
        }
        
        $.ajax({
            url: twp_frontend_ajax.ajax_url,
            method: 'POST',
            data: {
                action: 'twp_generate_capability_token',
                nonce: twp_frontend_ajax.nonce
            },
            success: function(response) {
                if (response.success) {
                    console.log('Token refreshed successfully');
                    // Update token expiry
                    tokenExpiry = Date.now() + (response.data.expires_in || 3600) * 1000;
                    // Update device with new token
                    setupTwilioDevice(response.data.token);
                    // Schedule next refresh
                    scheduleTokenRefresh();
                } else {
                    console.error('Failed to refresh token:', response.data);
                    updateStatus('offline', 'Token refresh failed');
                    showMessage('Failed to refresh connection. Please refresh the page.', 'error');
                }
            },
            error: function() {
                console.error('Failed to refresh token - network error');
                updateStatus('offline', 'Connection lost');
                // Retry in 30 seconds
                setTimeout(refreshToken, 30000);
            }
        });
    }
    
    /**
     * Initialize alert sound
     */
    function initAlertSound() {
        // Create audio element for alert sound
        alertSound = new Audio();
        alertSound.src = 'data:audio/wav;base64,UklGRiQAAABXQVZFZm10IBAAAAABAAEAQB8AAEAfAAABAAgAZGF0YQAAAAA='; // Simple beep sound
        // Use Web Audio API for better sound
        const audioContext = new (window.AudioContext || window.webkitAudioContext)();
        
        // Create a simple beep sound
        function playBeep() {
            const oscillator = audioContext.createOscillator();
            const gainNode = audioContext.createGain();
            
            oscillator.connect(gainNode);
            gainNode.connect(audioContext.destination);
            
            oscillator.frequency.value = 800; // Frequency in Hz
            gainNode.gain.setValueAtTime(0.3, audioContext.currentTime);
            gainNode.gain.exponentialRampToValueAtTime(0.01, audioContext.currentTime + 0.5);
            
            oscillator.start(audioContext.currentTime);
            oscillator.stop(audioContext.currentTime + 0.5);
        }
        
        return playBeep;
    }
    
    const playAlertSound = initAlertSound();
    
    /**
     * Start alert for new calls
     */
    function startAlert() {
        if (!alertEnabled || alertInterval) return;
        
        // Check if there are actually waiting calls before starting alert
        const hasWaitingCalls = userQueues.some(q => parseInt(q.current_waiting) > 0);
        if (!hasWaitingCalls) {
            console.log('No waiting calls found, not starting alert');
            return;
        }
        
        // Play initial alert
        playAlertSound();
        
        // Repeat every 30 seconds
        alertInterval = setInterval(function() {
            if (alertEnabled && !currentCall) {
                // Check if there are still waiting calls
                const stillHasWaitingCalls = userQueues.some(q => parseInt(q.current_waiting) > 0);
                if (stillHasWaitingCalls) {
                    playAlertSound();
                } else {
                    console.log('No more waiting calls, stopping alert');
                    stopAlert();
                }
            } else {
                stopAlert();
            }
        }, 30000);
    }
    
    /**
     * Stop alert
     */
    function stopAlert() {
        if (alertInterval) {
            clearInterval(alertInterval);
            alertInterval = null;
        }
    }
    
    /**
     * Toggle alert on/off
     */
    function toggleAlert() {
        alertEnabled = !alertEnabled;
        localStorage.setItem('twp_alert_enabled', alertEnabled);
        
        // Update button state
        updateAlertButton();
        
        if (!alertEnabled) {
            stopAlert();
            showMessage('Queue alerts disabled', 'info');
        } else {
            showMessage('Queue alerts enabled', 'success');
            // Check if there are waiting calls
            const hasWaitingCalls = userQueues.some(q => parseInt(q.current_waiting) > 0);
            if (hasWaitingCalls && !currentCall) {
                startAlert();
            }
        }
    }
    
    /**
     * Update alert button UI
     */
    function updateAlertButton() {
        const $btn = $('#twp-alert-toggle');
        if (alertEnabled) {
            $btn.removeClass('alert-off').addClass('alert-on').html('🔔 Alerts ON');
        } else {
            $btn.removeClass('alert-on').addClass('alert-off').html('🔕 Alerts OFF');
        }
    }
    
    /**
     * Load alert preference from localStorage
     */
    function loadAlertPreference() {
        const saved = localStorage.getItem('twp_alert_enabled');
        alertEnabled = saved === null ? true : saved === 'true';
        updateAlertButton();
    }
    
    // Clean up on page unload
    $(window).on('beforeunload', function() {
        if (tokenRefreshTimer) {
            clearTimeout(tokenRefreshTimer);
        }
        if (queuePollingTimer) {
            clearInterval(queuePollingTimer);
        }
        if (alertInterval) {
            clearInterval(alertInterval);
        }
        if (backgroundAlertInterval) {
            clearInterval(backgroundAlertInterval);
        }
        if (personalQueueTimer) {
            clearInterval(personalQueueTimer);
        }
        if (twilioDevice) {
            twilioDevice.destroy();
        }
    });
    
    /**
     * Load user's voicemails
     */
    function loadUserVoicemails(silent = false) {
        $.ajax({
            url: twp_frontend_ajax.ajax_url,
            method: 'POST',
            data: {
                action: 'twp_get_user_voicemails',
                nonce: twp_frontend_ajax.nonce
            },
            success: function(response) {
                if (response.success) {
                    displayVoicemails(response.data);
                } else if (!silent) {
                    showMessage('Failed to load voicemails: ' + (response.data || 'Unknown error'), 'error');
                }
            },
            error: function() {
                if (!silent) {
                    showMessage('Failed to load voicemails', 'error');
                }
            }
        });
    }
    
    /**
     * Toggle voicemail section visibility
     */
    function toggleVoicemailSection() {
        const $content = $('#twp-voicemail-content');
        const $toggle = $('#twp-voicemail-toggle .toggle-icon');
        const isVisible = $content.is(':visible');
        
        if (isVisible) {
            $content.slideUp(300);
            $toggle.text('▼');
            localStorage.setItem('twp_voicemail_collapsed', 'true');
        } else {
            $content.slideDown(300);
            $toggle.text('▲');
            localStorage.setItem('twp_voicemail_collapsed', 'false');
            // Load voicemails when expanding if not already loaded
            if ($('#twp-voicemail-list').children('.voicemail-loading').length > 0) {
                loadUserVoicemails();
            }
        }
    }
    
    /**
     * Initialize voicemail section state
     */
    function initVoicemailSection() {
        const isCollapsed = localStorage.getItem('twp_voicemail_collapsed') === 'true';
        const $content = $('#twp-voicemail-content');
        const $toggle = $('#twp-voicemail-toggle .toggle-icon');
        
        if (isCollapsed) {
            $content.hide();
            $toggle.text('▼');
        } else {
            $content.show();
            $toggle.text('▲');
            // Load voicemails immediately if expanded
            loadUserVoicemails();
        }
    }
    
    /**
     * Display voicemails in the UI
     */
    function displayVoicemails(data) {
        const $voicemailList = $('#twp-voicemail-list');
        
        // Update stats
        $('#twp-total-voicemails').text(data.total_count || 0);
        $('#twp-today-voicemails').text(data.today_count || 0);
        
        if (!data.voicemails || data.voicemails.length === 0) {
            $voicemailList.html('<div class="no-voicemails">No voicemails found.</div>');
            return;
        }
        
        let html = '';
        data.voicemails.forEach(function(voicemail) {
            const hasTranscription = voicemail.transcription && voicemail.transcription !== 'No transcription';
            const hasRecording = voicemail.has_recording;
            
            html += `
                <div class="voicemail-item ${hasRecording ? 'has-recording' : ''}" data-voicemail-id="${voicemail.id}">
                    <div class="voicemail-header">
                        <div class="voicemail-from">
                            <span class="phone-icon">📞</span>
                            <span class="from-number">${voicemail.from_number}</span>
                        </div>
                        <div class="voicemail-time">${voicemail.time_ago}</div>
                    </div>
                    <div class="voicemail-details">
                        <div class="voicemail-duration">
                            <span class="duration-icon">⏱️</span>
                            <span>${formatDuration(voicemail.duration)}</span>
                        </div>
                        ${hasRecording ? '<span class="recording-indicator">🎵 Recording</span>' : ''}
                    </div>
                    ${hasTranscription ? `<div class="voicemail-transcription">${voicemail.transcription}</div>` : ''}
                </div>
            `;
        });
        
        $voicemailList.html(html);
    }
    
    /**
     * Format duration in seconds to mm:ss
     */
    function formatDuration(seconds) {
        if (!seconds || seconds === 0) return '0:00';
        const minutes = Math.floor(seconds / 60);
        const remainingSeconds = seconds % 60;
        return minutes + ':' + String(remainingSeconds).padStart(2, '0');
    }
    
    /**
     * Play voicemail audio
     */
    function playVoicemail(voicemailId) {
        if (!voicemailId) return;
        
        // Get voicemail audio URL and play it
        $.ajax({
            url: twp_frontend_ajax.ajax_url,
            method: 'POST',
            data: {
                action: 'twp_get_voicemail_audio',
                voicemail_id: voicemailId,
                nonce: twp_frontend_ajax.nonce
            },
            success: function(response) {
                if (response.success && response.data.audio_url) {
                    // Create and play audio element
                    const audio = new Audio(response.data.audio_url);
                    audio.play().catch(function(error) {
                        showMessage('Failed to play voicemail: ' + error.message, 'error');
                    });
                    showMessage('Playing voicemail...', 'info');
                } else {
                    showMessage('No audio available for this voicemail', 'error');
                }
            },
            error: function() {
                showMessage('Failed to load voicemail audio', 'error');
            }
        });
    }
    
    /**
     * Initialize browser notifications
     */
    function initializeNotifications() {
        // Register service worker for background notifications
        if ('serviceWorker' in navigator) {
            navigator.serviceWorker.register('/wp-content/plugins/twilio-wp-plugin/assets/js/twp-service-worker.js')
                .then(function(registration) {
                    console.log('Service Worker registered:', registration);
                })
                .catch(function(error) {
                    console.log('Service Worker registration failed:', error);
                });
        }
        
        // Check if browser supports notifications
        if (!('Notification' in window)) {
            console.log('This browser does not support notifications');
            return;
        }
        
        // Check current permission status
        notificationPermission = Notification.permission;
        
        // Request permission if not already granted or denied
        if (notificationPermission === 'default') {
            // Add a button to request permission
            if ($('#twp-queue-global-actions').length > 0) {
                const $notificationBtn = $('<button>')
                    .attr('id', 'twp-enable-notifications')
                    .addClass('twp-btn twp-btn-info')
                    .html('🔔 Enable Alerts')
                    .on('click', requestNotificationPermission);
                
                $('#twp-queue-global-actions .global-queue-actions').append($notificationBtn);
            }
        } else if (notificationPermission === 'granted') {
            console.log('Notifications are enabled');
        }
    }
    
    /**
     * Request notification permission from user
     */
    function requestNotificationPermission() {
        Notification.requestPermission().then(function(permission) {
            notificationPermission = permission;
            
            if (permission === 'granted') {
                showMessage('Notifications enabled! You will be alerted even when the browser is in the background.', 'success');
                $('#twp-enable-notifications').hide();
                
                // Show test notification
                showBrowserNotification('Notifications Enabled', {
                    body: 'You will now receive alerts for incoming calls',
                    icon: '📞',
                    tag: 'test-notification'
                });
            } else if (permission === 'denied') {
                showMessage('Notifications blocked. Please enable them in your browser settings.', 'error');
                $('#twp-enable-notifications').text('❌ Notifications Blocked');
            }
        });
    }
    
    /**
     * Show browser notification
     */
    function showBrowserNotification(title, options = {}) {
        if (notificationPermission !== 'granted') {
            return;
        }
        
        const defaultOptions = {
            body: '',
            icon: '/wp-content/plugins/twilio-wp-plugin/assets/images/phone-icon.png',
            badge: '/wp-content/plugins/twilio-wp-plugin/assets/images/phone-badge.png',
            vibrate: [200, 100, 200],
            requireInteraction: true, // Keep notification visible until clicked
            tag: 'twp-call-notification',
            data: options.data || {}
        };
        
        const notificationOptions = Object.assign(defaultOptions, options);
        
        try {
            const notification = new Notification(title, notificationOptions);
            
            // Handle notification click
            notification.onclick = function(event) {
                event.preventDefault();
                window.focus();
                notification.close();
                
                // If there's queue data, select that queue
                if (event.target.data && event.target.data.queueId) {
                    selectQueue(event.target.data.queueId);
                }
            };
            
            // Auto-close after 30 seconds if not required interaction
            if (!notificationOptions.requireInteraction) {
                setTimeout(function() {
                    notification.close();
                }, 30000);
            }
            
            return notification;
        } catch (error) {
            console.error('Failed to show notification:', error);
            // Fallback to service worker notification if available
            if ('serviceWorker' in navigator && navigator.serviceWorker.controller) {
                navigator.serviceWorker.ready.then(function(registration) {
                    registration.showNotification(title, notificationOptions);
                });
            }
        }
    }
    
    /**
     * Initialize page visibility handling
     */
    function initializePageVisibility() {
        // Set up visibility change detection
        let hidden, visibilityChange;
        
        if (typeof document.hidden !== 'undefined') {
            hidden = 'hidden';
            visibilityChange = 'visibilitychange';
        } else if (typeof document.msHidden !== 'undefined') {
            hidden = 'msHidden';
            visibilityChange = 'msvisibilitychange';
        } else if (typeof document.webkitHidden !== 'undefined') {
            hidden = 'webkitHidden';
            visibilityChange = 'webkitvisibilitychange';
        }
        
        // Handle visibility change
        document.addEventListener(visibilityChange, function() {
            isPageVisible = !document[hidden];
            
            if (isPageVisible) {
                console.log('Page is now visible');
                // Resume normal operations
                if (backgroundAlertInterval) {
                    clearInterval(backgroundAlertInterval);
                    backgroundAlertInterval = null;
                }
            } else {
                console.log('Page is now hidden/background');
                // Start more aggressive notifications for background
                if (alertEnabled && userQueues.some(q => parseInt(q.current_waiting) > 0)) {
                    startBackgroundAlerts();
                }
            }
        }, false);
        
        // Also handle window focus/blur for better mobile support
        $(window).on('focus', function() {
            isPageVisible = true;
            if (backgroundAlertInterval) {
                clearInterval(backgroundAlertInterval);
                backgroundAlertInterval = null;
            }
        });
        
        $(window).on('blur', function() {
            isPageVisible = false;
        });
    }
    
    /**
     * Start background alerts with notifications
     */
    function startBackgroundAlerts() {
        if (backgroundAlertInterval) return;
        
        // Check and notify every 10 seconds when in background
        backgroundAlertInterval = setInterval(function() {
            const waitingQueues = userQueues.filter(q => parseInt(q.current_waiting) > 0);
            
            if (waitingQueues.length > 0 && !currentCall) {
                // Count total waiting calls
                const totalWaiting = waitingQueues.reduce((sum, q) => sum + parseInt(q.current_waiting), 0);
                
                // Show browser notification
                showBrowserNotification(`${totalWaiting} Call${totalWaiting > 1 ? 's' : ''} Waiting!`, {
                    body: waitingQueues.map(q => `${q.queue_name}: ${q.current_waiting} waiting`).join('\n'),
                    icon: '📞',
                    vibrate: [300, 200, 300, 200, 300],
                    requireInteraction: true,
                    tag: 'queue-alert',
                    data: {
                        queueId: waitingQueues[0].id
                    }
                });
                
                // Also try to play sound if possible
                try {
                    playAlertSound();
                } catch (e) {
                    // Sound might be blocked in background
                }
            } else if (waitingQueues.length === 0) {
                // No more calls, stop background alerts
                clearInterval(backgroundAlertInterval);
                backgroundAlertInterval = null;
            }
        }, 10000); // Every 10 seconds in background
    }
    
    // Load alert preference on init
    loadAlertPreference();
    
    /**
     * Initialize personal queue for incoming transfers
     */
    function initializePersonalQueue() {
        if (!twp_frontend_ajax.user_id) return;
        
        // Set personal queue name
        personalQueueName = 'agent_' + twp_frontend_ajax.user_id;
        
        // Start polling for incoming transfers
        checkPersonalQueue();
        personalQueueTimer = setInterval(checkPersonalQueue, 3000); // Check every 3 seconds
    }
    
    /**
     * Check personal queue for incoming transfers
     */
    function checkPersonalQueue() {
        // Don't check if already in a call
        if (currentCall) return;
        
        $.ajax({
            url: twp_frontend_ajax.ajax_url,
            method: 'POST',
            data: {
                action: 'twp_check_personal_queue',
                nonce: twp_frontend_ajax.nonce
            },
            success: function(response) {
                if (response.success && response.data.has_waiting_call) {
                    handleIncomingTransfer(response.data);
                }
            },
            error: function() {
                // Silently fail - don't interrupt user
            }
        });
    }
    
    /**
     * Handle incoming transfer notification
     */
    function handleIncomingTransfer(data) {
        // Show notification
        showMessage('Incoming transfer! The call will be connected automatically.', 'info');
        
        // Show browser notification
        if (notificationPermission === 'granted') {
            showBrowserNotification('📞 Incoming Transfer!', {
                body: 'A call is being transferred to you',
                icon: '📞',
                vibrate: [300, 200, 300],
                requireInteraction: true,
                tag: 'transfer-notification'
            });
        }
        
        // Play alert sound if enabled
        if (alertEnabled) {
            playAlertSound();
        }
        
        // Auto-accept the transfer after a short delay
        setTimeout(function() {
            acceptTransferCall(data);
        }, 2000);
    }
    
    /**
     * Accept incoming transfer call
     */
    function acceptTransferCall(data) {
        $.ajax({
            url: twp_frontend_ajax.ajax_url,
            method: 'POST',
            data: {
                action: 'twp_accept_transfer_call',
                call_sid: data.call_sid,
                queue_id: data.queue_id,
                nonce: twp_frontend_ajax.nonce
            },
            success: function(response) {
                if (response.success) {
                    showMessage('Transfer accepted, connecting...', 'success');
                } else {
                    showMessage('Failed to accept transfer: ' + (response.data || 'Unknown error'), 'error');
                }
            },
            error: function() {
                showMessage('Failed to accept transfer', 'error');
            }
        });
    }
    
    /**
     * Toggle call hold
     */
    function toggleHold() {
        if (!currentCall || currentCall.status() !== 'open') {
            showMessage('No active call to hold', 'error');
            return;
        }
        
        // Get Call SID using multiple detection methods
        const callSid = currentCall.parameters.CallSid || 
                        currentCall.customParameters.CallSid || 
                        currentCall.outgoingConnectionId ||
                        currentCall.sid;
                        
        if (!callSid) {
            showMessage('Unable to identify call for hold operation', 'error');
            return;
        }
        
        const $holdBtn = $('#twp-hold-btn');
        const currentHoldState = isOnHold;
        
        console.log('Hold button element found:', $holdBtn.length);
        console.log('Current hold state:', currentHoldState);
        console.log('Current button text:', $holdBtn.text());
        
        // Update button immediately for better UX
        if (currentHoldState) {
            $holdBtn.text('Resuming...').prop('disabled', true);
        } else {
            $holdBtn.text('Holding...').prop('disabled', true);
        }
        
        console.log('Sending hold toggle request:', {
            action: 'twp_toggle_hold',
            call_sid: callSid,
            hold: !currentHoldState,
            nonce: twp_frontend_ajax.nonce
        });
        
        $.ajax({
            url: twp_frontend_ajax.ajax_url,
            method: 'POST',
            data: {
                action: 'twp_toggle_hold',
                call_sid: callSid,
                hold: !currentHoldState,
                nonce: twp_frontend_ajax.nonce
            },
            success: function(response) {
                console.log('Hold toggle response:', response);
                console.log('Current hold state before:', currentHoldState);
                console.log('New hold state will be:', !currentHoldState);
                
                if (response.success) {
                    isOnHold = !currentHoldState;
                    console.log('Hold state updated to:', isOnHold);
                    
                    // Update hold button and show/hide dedicated resume button
                    const $resumeBtn = $('#twp-resume-btn');
                    
                    if (isOnHold) {
                        console.log('Setting button to Resume state...');
                        $holdBtn.text('Resume').addClass('btn-active').prop('disabled', false);
                        
                        // Show dedicated resume button
                        $resumeBtn.show();
                        console.log('Resume button shown - visible:', $resumeBtn.is(':visible'));
                        
                        console.log('Button after update - text:', $holdBtn.text(), 'classes:', $holdBtn.attr('class'));
                        showMessage('Call placed on hold - Click Resume Call button to continue', 'info');
                        
                        // Verify the button was actually updated
                        setTimeout(function() {
                            console.log('Button state after 100ms:', $holdBtn.text(), $holdBtn.hasClass('btn-active'));
                            console.log('Resume button visible after 100ms:', $resumeBtn.is(':visible'));
                        }, 100);
                    } else {
                        console.log('Setting button to Hold state...');
                        $holdBtn.text('Hold').removeClass('btn-active').prop('disabled', false);
                        
                        // Hide dedicated resume button
                        $resumeBtn.hide();
                        console.log('Resume button hidden');
                        
                        console.log('Button after update - text:', $holdBtn.text(), 'classes:', $holdBtn.attr('class'));
                        showMessage('Call resumed', 'info');
                    }
                } else {
                    console.error('Hold toggle failed:', response);
                    // Revert button state on error
                    const $resumeBtn = $('#twp-resume-btn');
                    if (currentHoldState) {
                        $holdBtn.text('Resume').addClass('btn-active').prop('disabled', false);
                        $resumeBtn.show(); // Keep resume button visible if we were on hold
                    } else {
                        $holdBtn.text('Hold').removeClass('btn-active').prop('disabled', false);
                        $resumeBtn.hide(); // Hide resume button if we weren't on hold
                    }
                    showMessage('Failed to toggle hold: ' + (response.data || 'Unknown error'), 'error');
                }
            },
            error: function(xhr, status, error) {
                console.error('Hold toggle AJAX error:', status, error);
                console.error('Response:', xhr.responseText);
                
                // Revert button state on error
                const $resumeBtn = $('#twp-resume-btn');
                if (currentHoldState) {
                    $holdBtn.text('Resume').addClass('btn-active').prop('disabled', false);
                    $resumeBtn.show(); // Keep resume button visible if we were on hold
                } else {
                    $holdBtn.text('Hold').removeClass('btn-active').prop('disabled', false);
                    $resumeBtn.hide(); // Hide resume button if we weren't on hold
                }
                showMessage('Failed to toggle hold', 'error');
            }
        });
    }
    
    /**
     * Transfer call to phone number (legacy function)
     */
    function transferCall(agentNumber) {
        transferToTarget('phone', agentNumber);
    }
    
    /**
     * Transfer call to target (phone or queue)
     */
    function transferToTarget(transferType, transferTarget) {
        if (!currentCall || currentCall.status() !== 'open') {
            showMessage('No active call to transfer', 'error');
            return;
        }
        
        // Get Call SID using multiple detection methods
        const callSid = currentCall.parameters.CallSid || 
                        currentCall.customParameters.CallSid || 
                        currentCall.outgoingConnectionId ||
                        currentCall.sid;
                        
        if (!callSid) {
            showMessage('Unable to identify call for transfer', 'error');
            return;
        }
        
        // Support both legacy format and new extension-based format
        const requestData = {
            action: 'twp_transfer_call',
            call_sid: callSid,
            nonce: twp_frontend_ajax.nonce
        };
        
        // Use new format if target looks like extension or queue ID, otherwise use legacy
        if (transferType === 'queue' || (transferType === 'extension') || 
            (transferType === 'phone' && /^\d{3,4}$/.test(transferTarget))) {
            // New format - extension or queue ID
            requestData.target_queue_id = transferTarget;
            requestData.current_queue_id = null; // Frontend doesn't track current queue
        } else {
            // Legacy format - phone number or old queue format
            requestData.transfer_type = transferType;
            requestData.transfer_target = transferTarget;
        }
        
        $.ajax({
            url: twp_frontend_ajax.ajax_url,
            method: 'POST',
            data: requestData,
            success: function(response) {
                if (response.success) {
                    showMessage('Call transferred successfully', 'success');
                    hideTransferDialog();
                    // Don't disconnect - let the transfer complete naturally
                    // The call will be disconnected by Twilio after successful transfer
                } else {
                    showMessage('Failed to transfer call: ' + (response.data || 'Unknown error'), 'error');
                }
            },
            error: function() {
                showMessage('Failed to transfer call', 'error');
            }
        });
    }
    
    /**
     * Requeue call to a different queue
     */
    function requeueCall(queueId) {
        if (!currentCall || currentCall.status() !== 'open') {
            showMessage('No active call to requeue', 'error');
            return;
        }
        
        $.ajax({
            url: twp_frontend_ajax.ajax_url,
            method: 'POST',
            data: {
                action: 'twp_requeue_call',
                call_sid: currentCall.parameters.CallSid,
                queue_id: queueId,
                nonce: twp_frontend_ajax.nonce
            },
            success: function(response) {
                if (response.success) {
                    showMessage('Call requeued successfully', 'success');
                    hideRequeueDialog();
                    // End the call on our end
                    if (currentCall) {
                        currentCall.disconnect();
                    }
                } else {
                    showMessage('Failed to requeue call: ' + (response.data || 'Unknown error'), 'error');
                }
            },
            error: function() {
                showMessage('Failed to requeue call', 'error');
            }
        });
    }
    
    /**
     * Toggle call recording
     */
    function toggleRecording() {
        if (!currentCall || currentCall.status() !== 'open') {
            showMessage('No active call to record', 'error');
            return;
        }
        
        if (isRecording) {
            stopRecording();
        } else {
            startRecording();
        }
    }
    
    /**
     * Start recording the current call
     */
    function startRecording() {
        if (!currentCall || currentCall.status() !== 'open') {
            showMessage('No active call to record', 'error');
            return;
        }
        
        // Try multiple ways to get the call SID
        const callSid = currentCall.parameters.CallSid || 
                        currentCall.customParameters.CallSid || 
                        currentCall.outgoingConnectionId ||
                        currentCall.sid;
        
        console.log('Frontend currentCall object:', currentCall);
        console.log('Frontend attempting to record call SID:', callSid);
        
        if (!callSid) {
            showMessage('Could not determine call SID for recording', 'error');
            return;
        }
        
        const $recordBtn = $('#twp-record-btn');
        
        $.ajax({
            url: twp_frontend_ajax.ajax_url,
            method: 'POST',
            data: {
                action: 'twp_start_recording',
                call_sid: callSid,
                nonce: twp_frontend_ajax.nonce
            },
            success: function(response) {
                if (response.success) {
                    isRecording = true;
                    recordingSid = response.data.recording_sid;
                    $recordBtn.text('Stop Recording').addClass('btn-active btn-recording');
                    showMessage('Recording started', 'success');
                } else {
                    showMessage('Failed to start recording: ' + (response.data || 'Unknown error'), 'error');
                }
            },
            error: function(xhr, status, error) {
                console.error('Frontend recording start failed:', xhr.responseText);
                showMessage('Failed to start recording: ' + error, 'error');
            }
        });
    }
    
    /**
     * Stop recording the current call
     */
    function stopRecording() {
        if (!recordingSid) return;
        
        const $recordBtn = $('#twp-record-btn');
        
        $.ajax({
            url: twp_frontend_ajax.ajax_url,
            method: 'POST',
            data: {
                action: 'twp_stop_recording',
                call_sid: currentCall ? currentCall.parameters.CallSid : '',
                recording_sid: recordingSid,
                nonce: twp_frontend_ajax.nonce
            },
            success: function(response) {
                if (response.success) {
                    isRecording = false;
                    recordingSid = null;
                    $recordBtn.text('Record').removeClass('btn-active btn-recording');
                    showMessage('Recording stopped', 'info');
                } else {
                    showMessage('Failed to stop recording: ' + (response.data || 'Unknown error'), 'error');
                }
            },
            error: function() {
                showMessage('Failed to stop recording', 'error');
            }
        });
    }
    
    /**
     * Show transfer dialog
     */
    function showTransferDialog() {
        // First load available agents
        $.ajax({
            url: twp_frontend_ajax.ajax_url,
            method: 'POST',
            data: {
                action: 'twp_get_online_agents',
                nonce: twp_frontend_ajax.nonce
            },
            success: function(response) {
                if (response.success && response.data.length > 0) {
                    showAgentTransferDialog(response.data);
                } else {
                    // Fallback to manual phone number entry
                    showManualTransferDialog();
                }
            },
            error: function() {
                // Fallback to manual phone number entry
                showManualTransferDialog();
            }
        });
    }
    
    /**
     * Show agent selection transfer dialog
     */
    function showAgentTransferDialog(agents = null) {
        if (agents) {
            // Use passed agents data directly
            buildAgentTransferDialog(agents);
        } else {
            // Load available agents for transfer (try enhanced system first)
            $.ajax({
                url: twp_frontend_ajax.ajax_url,
                method: 'POST',
                data: {
                    action: 'twp_get_transfer_targets',
                    nonce: twp_frontend_ajax.nonce
                },
                success: function(response) {
                    if (response.success) {
                        // Handle new enhanced response format
                        if (response.data.users) {
                            buildEnhancedTransferDialog(response.data);
                        } else {
                            // Legacy format
                            buildAgentTransferDialog(response.data);
                        }
                    } else {
                        // Try fallback to legacy system
                        $.ajax({
                            url: twp_frontend_ajax.ajax_url,
                            method: 'POST',
                            data: {
                                action: 'twp_get_transfer_agents',
                                nonce: twp_frontend_ajax.nonce
                            },
                            success: function(legacyResponse) {
                                if (legacyResponse.success) {
                                    buildAgentTransferDialog(legacyResponse.data);
                                } else {
                                    showManualTransferDialog();
                                }
                            },
                            error: function() {
                                showManualTransferDialog();
                            }
                        });
                    }
                },
                error: function() {
                    showMessage('Failed to load agents', 'error');
                    showManualTransferDialog(); // Fallback to manual entry
                }
            });
        }
    }
    
    /**
     * Build and display enhanced transfer dialog with extensions
     */
    function buildEnhancedTransferDialog(data) {
        let agentOptions = '<div class="agent-list">';
        
        // Add users with extensions
        if (data.users && data.users.length > 0) {
            agentOptions += '<div class="transfer-section"><h4>Transfer to Agent</h4>';
            data.users.forEach(function(user) {
                const statusClass = user.is_logged_in ? 'available' : 'offline';
                const statusText = user.is_logged_in ? '🟢 Online' : '🔴 Offline';
                
                agentOptions += `
                    <div class="agent-option ${statusClass}" data-agent-id="${user.user_id}">
                        <div class="agent-info">
                            <span class="agent-name">${user.display_name}</span>
                            <span class="agent-extension">Ext: ${user.extension}</span>
                            <span class="agent-status">${statusText} (${user.status})</span>
                        </div>
                        <div class="transfer-methods">
                            <div class="transfer-option" data-type="extension" data-target="${user.extension}">
                                📞 Extension ${user.extension}
                            </div>
                        </div>
                    </div>
                `;
            });
            agentOptions += '</div>';
        }
        
        // Add general queues
        if (data.queues && data.queues.length > 0) {
            agentOptions += '<div class="transfer-section"><h4>Transfer to Queue</h4>';
            data.queues.forEach(function(queue) {
                agentOptions += `
                    <div class="queue-option" data-queue-id="${queue.id}">
                        <div class="queue-info">
                            <span class="queue-name">${queue.queue_name}</span>
                            <span class="queue-waiting">${queue.waiting_calls} waiting</span>
                        </div>
                        <div class="transfer-methods">
                            <div class="transfer-option" data-type="queue" data-target="${queue.id}">
                                📋 Queue
                            </div>
                        </div>
                    </div>
                `;
            });
            agentOptions += '</div>';
        }
        
        if ((!data.users || data.users.length === 0) && (!data.queues || data.queues.length === 0)) {
            agentOptions += '<p class="no-agents">No agents or queues available for transfer</p>';
        }
        
        agentOptions += '</div>';
        
        const dialog = `
            <div id="twp-transfer-dialog" class="twp-dialog-overlay">
                <div class="twp-dialog twp-enhanced-transfer-dialog">
                    <h3>Transfer Call</h3>
                    <p>Select an agent or queue:</p>
                    ${agentOptions}
                    <div class="manual-option">
                        <h4>Manual Transfer</h4>
                        <p>Or enter a phone number or extension directly:</p>
                        <input type="text" id="twp-transfer-manual-number" placeholder="Extension (100) or Phone (+1234567890)" />
                    </div>
                    <div class="dialog-buttons">
                        <button id="twp-confirm-agent-transfer" class="twp-btn twp-btn-primary" disabled>Transfer</button>
                        <button id="twp-cancel-transfer" class="twp-btn twp-btn-secondary">Cancel</button>
                    </div>
                </div>
            </div>
        `;
        
        $('body').append(dialog);
        
        // Handle transfer option selection
        let selectedTransfer = null;
        $('.transfer-option').on('click', function() {
            const agentOption = $(this).closest('.agent-option');
            const queueOption = $(this).closest('.queue-option');
            
            // Check if agent is available (only for agents, not queues)
            if (agentOption.length && agentOption.hasClass('offline')) {
                showMessage('Cannot transfer to offline agents', 'error');
                return;
            }
            
            // Clear other selections
            $('.transfer-option').removeClass('selected');
            $('#twp-transfer-manual-number').val('');
            
            // Select this option
            $(this).addClass('selected');
            
            selectedTransfer = {
                type: $(this).data('type'),
                target: $(this).data('target'),
                agentId: agentOption.length ? agentOption.data('agent-id') : null,
                queueId: queueOption.length ? queueOption.data('queue-id') : null
            };
            
            $('#twp-confirm-agent-transfer').prop('disabled', false);
        });
        
        // Handle manual number entry
        $('#twp-transfer-manual-number').on('input', function() {
            const input = $(this).val().trim();
            if (input) {
                $('.transfer-option').removeClass('selected');
                
                // Determine if it's an extension or phone number
                let transferType, transferTarget;
                if (/^\d{3,4}$/.test(input)) {
                    // Extension
                    transferType = 'extension';
                    transferTarget = input;
                } else {
                    // Phone number
                    transferType = 'phone';
                    transferTarget = input;
                }
                
                selectedTransfer = { type: transferType, target: transferTarget };
                $('#twp-confirm-agent-transfer').prop('disabled', false);
            } else {
                $('#twp-confirm-agent-transfer').prop('disabled', !selectedTransfer);
            }
        });
        
        // Handle transfer confirmation
        $('#twp-confirm-agent-transfer').on('click', function() {
            if (selectedTransfer) {
                transferToTarget(selectedTransfer.type, selectedTransfer.target);
            }
        });
    }
    
    /**
     * Build and display agent transfer dialog with loaded agents (legacy)
     */
    function buildAgentTransferDialog(agents) {
        let agentOptions = '<div class="agent-list">';
        
        if (agents.length === 0) {
            agentOptions += '<p class="no-agents">No other agents available for transfer</p>';
        } else {
            agents.forEach(function(agent) {
                const statusClass = agent.status === 'available' ? 'available' : 
                                  agent.status === 'busy' ? 'busy' : 'offline';
                const statusText = agent.status === 'available' ? '🟢 Available' : 
                                 agent.status === 'busy' ? '🔴 Busy' : '⚫ Offline';
                
                // Determine transfer options
                let transferOptions = '<div class="transfer-methods">';
                
                // Add browser phone queue option (always available)
                transferOptions += `
                    <div class="transfer-option" data-type="queue" data-target="${agent.queue_name}">
                        💻 Browser Phone Queue
                    </div>
                `;
                
                // Add phone option if available
                if (agent.has_phone && agent.phone) {
                    transferOptions += `
                        <div class="transfer-option" data-type="phone" data-target="${agent.phone}">
                            📱 Phone (${agent.phone})
                        </div>
                    `;
                }
                
                transferOptions += '</div>';
                
                agentOptions += `
                    <div class="agent-option ${statusClass}" data-agent-id="${agent.id}">
                        <div class="agent-info">
                            <span class="agent-name">${agent.name}</span>
                            <span class="agent-status">${statusText}</span>
                        </div>
                        ${transferOptions}
                    </div>
                `;
            });
        }
        
        agentOptions += '</div>';
        
        const dialog = `
            <div id="twp-transfer-dialog" class="twp-dialog-overlay">
                <div class="twp-dialog twp-agent-transfer-dialog">
                    <h3>Transfer Call to Agent</h3>
                    <p>Select an agent and transfer method:</p>
                    ${agentOptions}
                    <div class="manual-option">
                        <h4>Manual Transfer</h4>
                        <p>Or enter a phone number directly:</p>
                        <input type="tel" id="twp-transfer-manual-number" placeholder="+1234567890" />
                    </div>
                    <div class="dialog-buttons">
                        <button id="twp-confirm-agent-transfer" class="twp-btn twp-btn-primary" disabled>Transfer</button>
                        <button id="twp-cancel-transfer" class="twp-btn twp-btn-secondary">Cancel</button>
                    </div>
                </div>
            </div>
        `;
        
        $('body').append(dialog);
        
        // Handle transfer option selection
        let selectedTransfer = null;
        $('.transfer-option').on('click', function() {
            const agentOption = $(this).closest('.agent-option');
            
            // Check if agent is available
            if (agentOption.hasClass('offline')) {
                showMessage('Cannot transfer to offline agents', 'error');
                return;
            }
            
            // Clear other selections
            $('.transfer-option').removeClass('selected');
            $('#twp-transfer-manual-number').val('');
            
            // Select this option
            $(this).addClass('selected');
            
            selectedTransfer = {
                type: $(this).data('type'),
                target: $(this).data('target'),
                agentId: agentOption.data('agent-id')
            };
            
            $('#twp-confirm-agent-transfer').prop('disabled', false);
        });
        
        // Handle manual number entry
        $('#twp-transfer-manual-number').on('input', function() {
            const number = $(this).val().trim();
            if (number) {
                $('.transfer-option').removeClass('selected');
                selectedTransfer = { type: 'phone', target: number };
                $('#twp-confirm-agent-transfer').prop('disabled', false);
            } else {
                $('#twp-confirm-agent-transfer').prop('disabled', !selectedTransfer);
            }
        });
        
        // Handle transfer confirmation
        $('#twp-confirm-agent-transfer').on('click', function() {
            if (selectedTransfer) {
                transferToTarget(selectedTransfer.type, selectedTransfer.target);
            }
        });
    }
    
    /**
     * Show manual transfer dialog (fallback)
     */
    function showManualTransferDialog() {
        const dialog = `
            <div id="twp-transfer-dialog" class="twp-dialog-overlay">
                <div class="twp-dialog">
                    <h3>Transfer Call</h3>
                    <p>Enter the phone number to transfer this call:</p>
                    <input type="tel" id="twp-transfer-agent-number" placeholder="+1234567890" />
                    <div class="dialog-buttons">
                        <button id="twp-confirm-transfer" class="twp-btn twp-btn-primary">Transfer</button>
                        <button id="twp-cancel-transfer" class="twp-btn twp-btn-secondary">Cancel</button>
                    </div>
                </div>
            </div>
        `;
        $('body').append(dialog);
    }
    
    
    /**
     * Hide transfer dialog
     */
    function hideTransferDialog() {
        $('#twp-transfer-dialog').remove();
    }
    
    /**
     * Show requeue dialog
     */
    function showRequeueDialog() {
        // Load available queues first
        $.ajax({
            url: twp_frontend_ajax.ajax_url,
            method: 'POST',
            data: {
                action: 'twp_get_requeue_queues',
                nonce: twp_frontend_ajax.nonce
            },
            success: function(response) {
                if (response.success && response.data.length > 0) {
                    let options = '';
                    response.data.forEach(function(queue) {
                        options += `<option value="${queue.id}">${queue.queue_name}</option>`;
                    });
                    
                    const dialog = `
                        <div id="twp-requeue-dialog" class="twp-dialog-overlay">
                            <div class="twp-dialog">
                                <h3>Requeue Call</h3>
                                <p>Select a queue to transfer this call to:</p>
                                <select id="twp-requeue-select">
                                    ${options}
                                </select>
                                <div class="dialog-buttons">
                                    <button id="twp-confirm-requeue" class="twp-btn twp-btn-primary">Requeue</button>
                                    <button id="twp-cancel-requeue" class="twp-btn twp-btn-secondary">Cancel</button>
                                </div>
                            </div>
                        </div>
                    `;
                    $('body').append(dialog);
                } else {
                    showMessage('No queues available', 'error');
                }
            },
            error: function() {
                showMessage('Failed to load queues', 'error');
            }
        });
    }
    
    /**
     * Hide requeue dialog
     */
    function hideRequeueDialog() {
        $('#twp-requeue-dialog').remove();
    }
    
})(jQuery);