// Zoom Web SDK Integration
import { ZoomMtg } from '@zoomus/websdk';

class ZoomMeetingManager {
    constructor(apiKey, apiSecret) {
        this.apiKey = apiKey;
        this.apiSecret = apiSecret;
        
        ZoomMtg.setZoomJSLib('https://source.zoom.us/lib', '/av');
        ZoomMtg.preLoadWasm();
        ZoomMtg.prepareWebSDK();
    }
    
    generateSignature(meetingNumber, role) {
        // Server-side signature generation required
        return fetch('/api/zoom/signature', {
            method: 'POST',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify({
                meetingNumber: meetingNumber,
                role: role
            })
        }).then(res => res.json());
    }
    
    async joinMeeting(meetingConfig) {
        const signature = await this.generateSignature(
            meetingConfig.meetingNumber,
            meetingConfig.role
        );
        
        ZoomMtg.init({
            leaveUrl: meetingConfig.leaveUrl,
            success: () => {
                ZoomMtg.join({
                    signature: signature.signature,
                    meetingNumber: meetingConfig.meetingNumber,
                    userName: meetingConfig.userName,
                    apiKey: this.apiKey,
                    userEmail: meetingConfig.userEmail,
                    passWord: meetingConfig.password,
                    success: (success) => {
                        console.log('Meeting joined successfully');
                    },
                    error: (error) => {
                        console.error('Meeting join failed:', error);
                    }
                });
            },
            error: (error) => {
                console.error('Zoom initialization failed:', error);
            }
        });
    }
    
    async createMeeting(meetingData) {
        const response = await fetch('https://api.zoom.us/v2/users/me/meetings', {
            method: 'POST',
            headers: {
                'Authorization': `Bearer ${this.accessToken}`,
                'Content-Type': 'application/json'
            },
            body: JSON.stringify({
                topic: meetingData.topic,
                type: 2, // Scheduled meeting
                start_time: meetingData.startTime,
                duration: meetingData.duration,
                timezone: meetingData.timezone,
                settings: {
                    host_video: true,
                    participant_video: true,
                    join_before_host: false,
                    mute_upon_entry: true,
                    watermark: false,
                    use_pmi: false,
                    approval_type: 2,
                    audio: 'both',
                    auto_recording: 'cloud'
                }
            })
        });
        
        return response.json();
    }
}

// Zoom Webhooks Handler
class ZoomWebhooks {
    constructor(webhookSecretToken) {
        this.secretToken = webhookSecretToken;
    }
    
    verifyWebhook(requestBody, timestamp, signature) {
        const crypto = require('crypto');
        const message = `v0:${timestamp}:${requestBody}`;
        const expectedSignature = crypto
            .createHmac('sha256', this.secretToken)
            .update(message, 'utf8')
            .digest('hex');
        
        return `v0=${expectedSignature}` === signature;
    }
    
    handleWebhookEvent(event) {
        switch (event.event) {
            case 'meeting.started':
                this.handleMeetingStarted(event.payload);
                break;
                
            case 'meeting.ended':
                this.handleMeetingEnded(event.payload);
                break;
                
            case 'meeting.participant_joined':
                this.handleParticipantJoined(event.payload);
                break;
                
            case 'meeting.participant_left':
                this.handleParticipantLeft(event.payload);
                break;
                
            case 'recording.completed':
                this.handleRecordingCompleted(event.payload);
                break;
                
            default:
                console.log(`Unhandled event: ${event.event}`);
        }
    }
    
    async handleMeetingStarted(payload) {
        console.log(`Meeting started: ${payload.object.topic}`);
        
        // Notify team via Slack
        await this.notifySlack({
            channel: '#meetings',
            text: `📹 Meeting "${payload.object.topic}" has started`,
            attachments: [{
                fields: [
                    { title: 'Host', value: payload.object.host_email, short: true },
                    { title: 'Duration', value: `${payload.object.duration} minutes`, short: true },
                    { title: 'Join URL', value: payload.object.join_url, short: false }
                ]
            }]
        });
    }
    
    async handleRecordingCompleted(payload) {
        console.log('Recording completed:', payload.object.id);
        
        // Process recording files
        for (const file of payload.object.recording_files) {
            if (file.file_type === 'MP4') {
                await this.processRecording({
                    meetingId: payload.object.id,
                    downloadUrl: file.download_url,
                    fileSize: file.file_size,
                    recordingStart: file.recording_start,
                    recordingEnd: file.recording_end
                });
            }
        }
    }
    
    async processRecording(recordingData) {
        // Upload to cloud storage
        // Generate transcription
        // Send notification to participants
        // Update meeting database
    }
}

// Calendar Integration
class ZoomCalendarIntegration {
    async syncWithGoogleCalendar(meetingData) {
        const calendar = google.calendar({ version: 'v3', auth: this.auth });
        
        const event = {
            summary: meetingData.topic,
            start: {
                dateTime: meetingData.start_time,
                timeZone: meetingData.timezone
            },
            end: {
                dateTime: this.calculateEndTime(meetingData.start_time, meetingData.duration),
                timeZone: meetingData.timezone
            },
            description: `Join Zoom Meeting: ${meetingData.join_url}`,
            conferenceData: {
                createRequest: {
                    requestId: `zoom-${meetingData.id}`,
                    conferenceSolutionKey: { type: 'hangoutsMeet' }
                }
            },
            attendees: meetingData.attendees.map(email => ({ email }))
        };
        
        return calendar.events.insert({
            calendarId: 'primary',
            resource: event,
            conferenceDataVersion: 1
        });
    }
    
    // CRM Integration
    async syncWithCRM(meetingData) {
        // Update contact records
        // Log meeting activity
        // Create follow-up tasks
        // Track meeting outcomes
    }
}