class SmallMeetingOptimizer {
    async optimizeForSmallGroup(participants) {
        if (participants.length <= 4 && this.allHaveGoodConnections(participants)) {
            // Use mesh P2P for lowest latency
            return this.setupMeshP2P(participants);
        } else {
            // Use lightweight SFU
            return this.setupLightweightSFU(participants);
        }
    }
    
    setupMeshP2P(participants) {
        // Each participant connects directly to every other participant
        const connections = [];
        for (let i = 0; i < participants.length; i++) {
            for (let j = i + 1; j < participants.length; j++) {
                connections.push(this.createP2PConnection(participants[i], participants[j]));
            }
        }
        return connections;
    }
}

class LargeMeetingManager {
    async setupLargeMeeting(meetingId, expectedParticipants) {
        const config = {
            activeSpeakers: Math.min(9, expectedParticipants * 0.1), // 10% or max 9
            viewerMode: expectedParticipants > 100,
            cascadingSFUs: Math.ceil(expectedParticipants / 500),
            recordingEnabled: true // Usually required for large meetings
        };
        
        return this.createTieredArchitecture(config);
    }
    
    createTieredArchitecture(config) {
        return {
            // Tier 1: Active speakers (full bidirectional)
            speakerTier: this.createSpeakerSFU(config.activeSpeakers),
            
            // Tier 2: Participants (can request to speak)
            participantTier: this.createParticipantSFU(),
            
            // Tier 3: Viewers (receive-only)
            viewerTier: this.createViewerCDN()
        };
    }
}

class WebinarManager {
    async setupWebinar(presenters, expectedViewers) {
        return {
            // Small interactive group for presenters
            presenterRoom: this.createInteractiveSFU(presenters),
            
            // One-way stream to large audience
            viewerStream: this.createCDNStream({
                source: 'presenterRoom',
                latency: 'low', // 3-5 seconds acceptable
                quality: 'adaptive',
                viewers: expectedViewers
            }),
            
            // Separate chat service for Q&A
            chatService: this.createScalableChat(expectedViewers)
        };
    }
}

class MobileOptimizer {
    constructor() {
        this.batteryAPI = navigator.getBattery?.();
        this.networkAPI = navigator.connection;
    }
    
    async optimizeForMobile() {
        const batteryLevel = await this.getBatteryLevel();
        const networkType = this.getNetworkType();
        
        return {
            videoQuality: this.selectVideoQuality(batteryLevel, networkType),
            frameRate: this.selectFrameRate(batteryLevel),
            audioProcessing: this.selectAudioProcessing(batteryLevel),
            backgroundMode: this.configureBackgroundMode()
        };
    }
    
    selectVideoQuality(batteryLevel, networkType) {
        if (batteryLevel < 0.2) return '240p'; // Low battery
        if (networkType === '3g') return '480p'; // Slow network
        if (networkType === '4g') return '720p'; // Good network
        return '1080p'; // WiFi or 5G
    }
    
    configureBackgroundMode() {
        // Reduce quality when app goes to background
        document.addEventListener('visibilitychange', () => {
            if (document.hidden) {
                this.enableBackgroundMode();
            } else {
                this.disableBackgroundMode();
            }
        });
    }
}

class RoomSystemOptimizer {
    setupRoomSystem(displayConfig) {
        return {
            // Optimize for large displays
            videoLayout: this.createGalleryLayout(displayConfig),
            
            // Enhanced audio for room acoustics
            audioConfig: {
                echoCancellation: 'aggressive',
                noiseSuppression: 'high',
                autoGainControl: true,
                beamforming: true // For microphone arrays
            },
            
            // Touch interface optimization
            ui: this.createTouchOptimizedUI(displayConfig.touchEnabled),
            
            // Multiple camera support
            cameras: this.setupMultiCameraSystem()
        };
    }
}

class VirtualBackgroundProcessor {
    constructor() {
        this.segmentationModel = this.loadSegmentationModel();
        this.backgroundLibrary = this.loadBackgroundLibrary();
    }
    
    async processVideoFrame(videoFrame) {
        // Use ML model for person segmentation
        const personMask = await this.segmentationModel.predict(videoFrame);
        
        // Apply background replacement
        const processedFrame = this.applyBackground(
            videoFrame, 
            personMask, 
            this.selectedBackground
        );
        
        return processedFrame;
    }
    
    async loadSegmentationModel() {
        // Load TensorFlow.js model for real-time segmentation
        return await tf.loadLayersModel('/models/person-segmentation/model.json');
    }
}

class RealTimeTranscription {
    constructor() {
        this.speechRecognition = new (window.SpeechRecognition || window.webkitSpeechRecognition)();
        this.setupRecognition();
    }
    
    setupRecognition() {
        this.speechRecognition.continuous = true;
        this.speechRecognition.interimResults = true;
        this.speechRecognition.lang = 'en-US';
        
        this.speechRecognition.onresult = (event) => {
            const transcript = this.processResults(event.results);
            this.broadcastTranscript(transcript);
        };
    }
    
    processResults(results) {
        let finalTranscript = '';
        let interimTranscript = '';
        
        for (let i = 0; i < results.length; i++) {
            const transcript = results[i][0].transcript;
            if (results[i].isFinal) {
                finalTranscript += transcript;
            } else {
                interimTranscript += transcript;
            }
        }
        
        return { final: finalTranscript, interim: interimTranscript };
    }
}

class BreakoutRoomManager {
    constructor(mainMeetingId) {
        this.mainMeetingId = mainMeetingId;
        this.breakoutRooms = new Map();
    }
    
    async createBreakoutRooms(config) {
        const { roomCount, assignmentType, duration } = config;
        const participants = await this.getMainMeetingParticipants();
        
        // Create breakout rooms
        for (let i = 0; i < roomCount; i++) {
            const roomId = await this.createRoom(`Breakout Room ${i + 1}`);
            this.breakoutRooms.set(roomId, {
                participants: [],
                createdAt: Date.now(),
                duration: duration
            });
        }
        
        // Assign participants
        const assignments = this.assignParticipants(participants, assignmentType);
        await this.moveParticipantsToRooms(assignments);
        
        // Set auto-return timer
        setTimeout(() => {
            this.returnAllToMainRoom();
        }, duration);
        
        return Array.from(this.breakoutRooms.keys());
    }
    
    assignParticipants(participants, type) {
        switch (type) {
            case 'automatic':
                return this.distributeEvenly(participants);
            case 'manual':
                return this.waitForManualAssignment(participants);
            case 'self-select':
                return this.allowSelfSelection(participants);
        }
    }
}

class CalendarIntegrator {
    constructor() {
        this.providers = {
            google: new GoogleCalendarAPI(),
            outlook: new OutlookCalendarAPI(),
            apple: new AppleCalendarAPI()
        };
    }
    
    async scheduleRecurringMeeting(meetingData) {
        const { title, startTime, recurrence, attendees } = meetingData;
        
        // Create meeting in video conferencing system
        const meeting = await this.createMeeting({
            title,
            scheduledStartTime: startTime,
            recurrence: recurrence
        });
        
        // Add to each attendee's calendar
        for (const attendee of attendees) {
            const provider = this.detectCalendarProvider(attendee.email);
            await this.providers[provider].createEvent({
                title: title,
                startTime: startTime,
                endTime: new Date(startTime.getTime() + 60 * 60 * 1000), // 1 hour
                attendees: attendees,
                location: meeting.joinUrl,
                recurrence: recurrence
            });
        }
        
        return meeting;
    }
}

class FileShareIntegrator {
    constructor() {
        this.storageProviders = {
            dropbox: new DropboxAPI(),
            googledrive: new GoogleDriveAPI(),
            onedrive: new OneDriveAPI(),
            box: new BoxAPI()
        };
    }
    
    async shareFileInMeeting(meetingId, fileInfo) {
        const { provider, fileId, fileName, permissions } = fileInfo;
        
        // Get shareable link from storage provider
        const shareLink = await this.storageProviders[provider].createShareLink(
            fileId, 
            permissions
        );
        
        // Send file share notification to meeting participants
        await this.broadcastToMeeting(meetingId, {
            type: 'file_shared',
            fileName: fileName,
            shareLink: shareLink,
            sharedBy: this.getCurrentUser(),
            timestamp: Date.now()
        });
        
        return shareLink;
    }
}

class CRMIntegrator {
    constructor() {
        this.crmProviders = {
            salesforce: new SalesforceAPI(),
            hubspot: new HubSpotAPI(),
            pipedrive: new PipedriveAPI()
        };
    }
    
    async enrichMeetingWithCRMData(meetingId, attendeeEmails) {
        const crmData = {};
        
        for (const email of attendeeEmails) {
            // Look up contact in CRM systems
            const contact = await this.findContactAcrossProviders(email);
            if (contact) {
                crmData[email] = {
                    company: contact.company,
                    title: contact.title,
                    lastInteraction: contact.lastInteraction,
                    dealStage: contact.dealStage,
                    notes: contact.recentNotes
                };
            }
        }
        
        // Display CRM context to meeting host
        await this.displayCRMContext(meetingId, crmData);
        
        return crmData;
    }
}

class VisualAccessibilityManager {
    constructor() {
        this.screenReader = this.detectScreenReader();
        this.highContrast = this.detectHighContrastMode();
    }
    
    setupAccessibleUI() {
        return {
            // High contrast mode
            theme: this.highContrast ? 'high-contrast' : 'default',
            
            // Screen reader announcements
            announcements: this.setupScreenReaderAnnouncements(),
            
            // Keyboard navigation
            keyboardShortcuts: this.setupKeyboardShortcuts(),
            
            // Visual indicators for audio cues
            visualAudioIndicators: this.setupVisualAudioCues()
        };
    }
    
    setupScreenReaderAnnouncements() {
        return {
            participantJoined: (name) => this.announce(`${name} joined the meeting`),
            participantLeft: (name) => this.announce(`${name} left the meeting`),
            screenShareStarted: (name) => this.announce(`${name} started sharing screen`),
            recordingStarted: () => this.announce('Meeting recording started'),
            chatMessage: (sender, message) => this.announce(`Chat from ${sender}: ${message}`)
        };
    }
}

class HearingAccessibilityManager {
    constructor() {
        this.captionService = new LiveCaptionService();
        this.signLanguageDetector = new SignLanguageDetector();
    }
    
    setupHearingAccessibility() {
        return {
            // Live captions
            liveCaptions: this.captionService.enable({
                language: 'en-US',
                position: 'bottom',
                fontSize: 'large'
            }),
            
            // Visual notifications
            visualNotifications: this.setupVisualNotifications(),
            
            // Sign language interpreter spotlight
            interpreterSpotlight: this.setupInterpreterSpotlight(),
            
            // Chat prominence for text communication
            chatEnhancement: this.enhanceChatForHearingImpaired()
        };
    }
    
    setupVisualNotifications() {
        return {
            participantActions: true,  // Visual cues for mute/unmute
            systemAlerts: true,        // Flash screen for important alerts
            chatMessages: true,        // Prominent chat notifications
            networkIssues: true        // Visual network quality indicators
        };
    }
}

class HIPAAComplianceManager {
    constructor() {
        this.encryptionLevel = 'AES-256';
        this.auditLogger = new HIPAAAuditLogger();
    }
    
    setupHIPAACompliantMeeting(meetingConfig) {
        return {
            // Enhanced encryption
            encryption: {
                endToEnd: true,
                algorithm: this.encryptionLevel,
                keyRotation: '24hours'
            },
            
            // Audit logging
            auditLog: this.auditLogger.createSession({
                meetingId: meetingConfig.meetingId,
                participants: meetingConfig.participants,
                dataTypes: ['PHI', 'medical_records']
            }),
            
            // Access controls
            accessControls: {
                waitingRoom: true,
                participantVerification: true,
                recordingRestrictions: 'host-only',
                chatRestrictions: 'disabled'
            },
            
            // Data retention
            dataRetention: {
                recordings: '7-years',
                metadata: '6-years',
                chatLogs: 'disabled',
                automaticDeletion: true
            }
        };
    }
}

class GDPRComplianceManager {
    constructor() {
        this.dataProcessor = new GDPRDataProcessor();
        this.consentManager = new ConsentManager();
    }
    
    async handleEUUserMeeting(userId, meetingId) {
        // Check user consent status
        const consent = await this.consentManager.getConsent(userId);
        
        if (!consent.videoProcessing) {
            throw new Error('Video processing consent required');
        }
        
        // Configure data processing
        return {
            dataProcessing: {
                location: 'EU', // Process data within EU
                retention: consent.dataRetention || '30-days',
                sharing: consent.dataSharing || 'none',
                analytics: consent.analytics || false
            },
            
            // User rights
            userRights: {
                dataExport: this.enableDataExport(userId),
                dataErasure: this.enableDataErasure(userId),
                dataPortability: this.enableDataPortability(userId)
            },
            
            // Privacy controls
            privacyControls: {
                recordingConsent: 'explicit',
                dataMinimization: true,
                purposeLimitation: true
            }
        };
    }
}

class QualityMonitoringSystem {
    constructor() {
        this.qualityMetrics = new Map();
        this.adaptationEngine = new QualityAdaptationEngine();
    }
    
    monitorParticipantQuality(participantId) {
        const metrics = {
            video: this.collectVideoMetrics(participantId),
            audio: this.collectAudioMetrics(participantId),
            network: this.collectNetworkMetrics(participantId)
        };
        
        this.qualityMetrics.set(participantId, metrics);
        
        // Trigger adaptations if quality degrades
        if (this.isQualityDegraded(metrics)) {
            this.adaptationEngine.adaptQuality(participantId, metrics);
        }
        
        return metrics;
    }
    
    collectVideoMetrics(participantId) {
        const stats = this.getWebRTCStats(participantId);
        return {
            frameRate: stats.framesPerSecond,
            resolution: `${stats.frameWidth}x${stats.frameHeight}`,
            bitrate: stats.totalBitrate,
            packetLoss: stats.packetsLost / stats.packetsSent,
            jitter: stats.jitter,
            freezeCount: stats.freezeCount,
            pauseCount: stats.pauseCount
        };
    }
}

class MeetingAnalytics {
    constructor() {
        this.analyticsEngine = new AnalyticsEngine();
        this.reportGenerator = new ReportGenerator();
    }
    
    generateMeetingInsights(timeframe) {
        return {
            // Usage patterns
            usagePatterns: this.analyzeUsagePatterns(timeframe),
            
            // Quality metrics
            qualityMetrics: this.aggregateQualityMetrics(timeframe),
            
            // User engagement
            engagementMetrics: this.calculateEngagementMetrics(timeframe),
            
            // Cost analysis
            costAnalysis: this.analyzeCosts(timeframe),
            
            // Recommendations
            recommendations: this.generateRecommendations(timeframe)
        };
    }
    
    analyzeUsagePatterns(timeframe) {
        return {
            peakHours: this.identifyPeakUsageHours(timeframe),
            averageMeetingDuration: this.calculateAverageDuration(timeframe),
            participantDistribution: this.analyzeParticipantCounts(timeframe),
            deviceUsage: this.analyzeDeviceTypes(timeframe),
            geographicDistribution: this.analyzeGeographicUsage(timeframe)
        };
    }
}