// Zoom RTMS + SmythOS SRE Integration (JavaScript version)
// This version avoids TypeScript compilation issues while demonstrating the integration

import express from 'express';
import crypto from 'crypto';
import WebSocket from 'ws';
import dotenv from 'dotenv';

// Load environment variables
dotenv.config();

const app = express();
const port = process.env.PORT || '3000';

// Zoom RTMS Configuration
const ZOOM_SECRET_TOKEN = process.env.ZOOM_SECRET_TOKEN;
const CLIENT_ID = process.env.ZOOM_CLIENT_ID;
const CLIENT_SECRET = process.env.ZOOM_CLIENT_SECRET;
const WEBHOOK_PATH = process.env.WEBHOOK_PATH || '/webhook';

// Middleware
app.use(express.json());

// Map to keep track of active connections and meeting data
const activeConnections = new Map();
const meetingAgents = new Map();

/**
 * Create an intelligent meeting agent using SRE
 * Note: This is a placeholder implementation. In a real scenario, you would:
 * 1. Import the actual SRE SDK: import { Agent, Model } from '@smythos/sdk';
 * 2. Initialize SRE with proper configuration
 * 3. Use real AI models for analysis
 */
async function createMeetingAgent(meetingUuid) {
    console.log(`Creating SRE agent for meeting: ${meetingUuid}`);
    
    // Placeholder agent implementation
    // In real implementation, this would be: new Agent({ ... })
    const agent = {
        id: `meeting-agent-${meetingUuid}`,
        name: 'Zoom Meeting Intelligence Agent',
        
        // Simulate SRE agent prompt method
        async prompt(message) {
            console.log(`Agent processing: ${message}`);
            
            // Simulate AI analysis
            if (message.includes('Analyze this transcript')) {
                return JSON.stringify({
                    topics: ['meeting discussion', 'project planning'],
                    actionItems: message.toLowerCase().includes('action') ? [message] : [],
                    decisions: message.toLowerCase().includes('decide') ? [message] : [],
                    questions: message.toLowerCase().includes('?') ? [message] : [],
                    sentiment: 'positive'
                });
            }
            
            if (message.includes('Generate a final meeting summary')) {
                return `Meeting Summary for ${meetingUuid}:
                - Meeting completed successfully
                - Key discussions captured
                - Action items identified
                - Ready for follow-up`;
            }
            
            return 'Analysis completed';
        },
        
        // Placeholder for SRE skills
        skills: new Map()
    };
    
    console.log(`SRE agent created for meeting: ${meetingUuid}`);
    return agent;
}

/**
 * Generate HMAC signature for Zoom RTMS authentication
 */
function generateSignature(clientId, meetingUuid, streamId, clientSecret) {
    const message = `${clientId},${meetingUuid},${streamId}`;
    return crypto.createHmac('sha256', clientSecret).update(message).digest('hex');
}

/**
 * Connect to Zoom signaling WebSocket
 */
function connectToSignalingWebSocket(meetingUuid, streamId, serverUrl) {
    console.log(`Connecting to signaling WebSocket for meeting ${meetingUuid}`);
    
    const ws = new WebSocket(serverUrl);
    
    // Store connection
    if (!activeConnections.has(meetingUuid)) {
        activeConnections.set(meetingUuid, {});
    }
    activeConnections.get(meetingUuid).signaling = ws;
    
    ws.on('open', () => {
        console.log(`Signaling WebSocket opened for meeting ${meetingUuid}`);
        
        const signature = generateSignature(CLIENT_ID, meetingUuid, streamId, CLIENT_SECRET);
        const handshake = {
            msg_type: 1, // SIGNALING_HAND_SHAKE_REQ
            protocol_version: 1,
            meeting_uuid: meetingUuid,
            rtms_stream_id: streamId,
            sequence: Math.floor(Math.random() * 1e9),
            signature,
        };
        
        ws.send(JSON.stringify(handshake));
        console.log('Sent handshake to signaling server');
    });
    
    ws.on('message', (data) => {
        const msg = JSON.parse(data.toString());
        console.log('Signaling Message:', JSON.stringify(msg, null, 2));
        
        // Handle successful handshake
        if (msg.msg_type === 2 && msg.status_code === 0) {
            const mediaUrl = msg.media_server;
            if (mediaUrl) {
                connectToMediaWebSocket(mediaUrl, meetingUuid, streamId, ws);
            }
        }
        
        // Handle keep-alive
        if (msg.msg_type === 12) {
            ws.send(JSON.stringify({
                msg_type: 13,
                timestamp: msg.timestamp,
            }));
        }
    });
    
    ws.on('error', (err) => {
        console.error('Signaling socket error:', err);
    });
    
    ws.on('close', () => {
        console.log('Signaling socket closed');
        if (activeConnections.has(meetingUuid)) {
            delete activeConnections.get(meetingUuid).signaling;
        }
    });
}

/**
 * Connect to Zoom media WebSocket for transcript data
 */
function connectToMediaWebSocket(mediaUrl, meetingUuid, streamId, signalingSocket) {
    console.log(`Connecting to media WebSocket at ${mediaUrl}`);
    
    const mediaWs = new WebSocket(mediaUrl, { rejectUnauthorized: false });
    
    // Store connection
    if (activeConnections.has(meetingUuid)) {
        activeConnections.get(meetingUuid).media = mediaWs;
    }
    
    // Initialize transcript storage for this meeting
    if (!activeConnections.get(meetingUuid).transcripts) {
        activeConnections.get(meetingUuid).transcripts = [];
    }
    
    mediaWs.on('open', () => {
        console.log(`Media WebSocket opened for meeting ${meetingUuid}`);
        
        const signature = generateSignature(CLIENT_ID, meetingUuid, streamId, CLIENT_SECRET);
        const handshake = {
            msg_type: 3, // DATA_HAND_SHAKE_REQ
            protocol_version: 1,
            meeting_uuid: meetingUuid,
            rtms_stream_id: streamId,
            signature,
            media_type: 8, // MEDIA_DATA_TRANSCRIPT
            payload_encryption: false,
        };
        
        mediaWs.send(JSON.stringify(handshake));
    });
    
    mediaWs.on('message', async (data) => {
        try {
            const msg = JSON.parse(data.toString());
            
            // Handle successful media handshake
            if (msg.msg_type === 4 && msg.status_code === 0) {
                signalingSocket.send(JSON.stringify({
                    msg_type: 7, // CLIENT_READY_ACK
                    rtms_stream_id: streamId,
                }));
                console.log('Media handshake successful, ready to receive transcripts');
            }
            
            // Handle transcript data
            if (msg.msg_type === 5 && msg.payload) { // DATA_FRAME
                const transcriptData = msg.payload;
                console.log('Received transcript:', transcriptData);
                
                // Get or create meeting agent
                let agent = meetingAgents.get(meetingUuid);
                if (!agent) {
                    agent = await createMeetingAgent(meetingUuid);
                    meetingAgents.set(meetingUuid, agent);
                }
                
                // Process transcript with SRE agent
                if (transcriptData.text && transcriptData.text.trim()) {
                    const transcriptInfo = {
                        transcript: transcriptData.text,
                        speaker: transcriptData.speaker_name || 'Unknown',
                        timestamp: new Date().toISOString(),
                        meetingId: meetingUuid
                    };
                    
                    // Store transcript
                    activeConnections.get(meetingUuid).transcripts.push(transcriptInfo);
                    
                    // Analyze with SRE agent (placeholder implementation)
                    try {
                        const analysis = await agent.prompt(`Analyze this transcript: "${transcriptInfo.transcript}" from ${transcriptInfo.speaker}`);
                        console.log('SRE Analysis:', analysis);
                        
                        // In real implementation, you would also:
                        // - Index in VectorDB if configured
                        // - Store in cloud storage
                        // - Generate embeddings
                        // - Perform sentiment analysis
                        
                    } catch (error) {
                        console.error('Error processing transcript with SRE:', error);
                    }
                }
            }
            
            // Handle keep-alive
            if (msg.msg_type === 12) {
                mediaWs.send(JSON.stringify({
                    msg_type: 13,
                    timestamp: msg.timestamp,
                }));
            }
        } catch (err) {
            // Handle binary data (audio/video)
            console.log('Received binary media data (length):', data.length);
        }
    });
    
    mediaWs.on('error', (err) => {
        console.error('Media socket error:', err);
    });
    
    mediaWs.on('close', () => {
        console.log('Media socket closed');
        if (activeConnections.has(meetingUuid)) {
            delete activeConnections.get(meetingUuid).media;
        }
    });
}

/**
 * Webhook handler for Zoom RTMS events
 */
app.post(WEBHOOK_PATH, async (req, res) => {
    console.log('RTMS Webhook received:', JSON.stringify(req.body, null, 2));
    const { event, payload } = req.body;
    
    // Handle URL validation
    if (event === 'endpoint.url_validation' && payload?.plainToken) {
        const hash = crypto
            .createHmac('sha256', ZOOM_SECRET_TOKEN)
            .update(payload.plainToken)
            .digest('hex');
        
        console.log('Responding to URL validation challenge');
        return res.json({
            plainToken: payload.plainToken,
            encryptedToken: hash,
        });
    }
    
    // Handle RTMS started
    if (event === 'meeting.rtms_started') {
        console.log('RTMS Started - Initializing SRE agent and connections');
        const { meeting_uuid, rtms_stream_id, server_urls } = payload;
        
        // Create SRE agent for this meeting
        try {
            const agent = await createMeetingAgent(meeting_uuid);
            meetingAgents.set(meeting_uuid, agent);
            console.log(`SRE agent created for meeting: ${meeting_uuid}`);
        } catch (error) {
            console.error('Error creating SRE agent:', error);
        }
        
        // Connect to Zoom WebSocket
        connectToSignalingWebSocket(meeting_uuid, rtms_stream_id, server_urls);
    }
    
    // Handle RTMS stopped
    if (event === 'meeting.rtms_stopped') {
        console.log('RTMS Stopped - Generating final summary');
        const { meeting_uuid } = payload;
        
        // Generate final meeting summary with SRE
        const agent = meetingAgents.get(meeting_uuid);
        const connectionData = activeConnections.get(meeting_uuid);
        
        if (agent && connectionData?.transcripts?.length > 0) {
            try {
                const summary = await agent.prompt(`Generate a final meeting summary for meeting ${meeting_uuid} with ${connectionData.transcripts.length} transcript segments`);
                console.log('Final Meeting Summary:', summary);
                
                // In real implementation, save to storage:
                // - AWS S3 for persistent storage
                // - Database for structured data
                // - VectorDB for semantic search
                console.log('Summary would be saved to storage via SRE agent');
                
            } catch (error) {
                console.error('Error generating final summary:', error);
            }
        }
        
        // Cleanup connections and agents
        if (activeConnections.has(meeting_uuid)) {
            const connections = activeConnections.get(meeting_uuid);
            for (const conn of Object.values(connections)) {
                if (conn && typeof conn.close === 'function') {
                    conn.close();
                }
            }
            activeConnections.delete(meeting_uuid);
        }
        
        if (meetingAgents.has(meeting_uuid)) {
            meetingAgents.delete(meeting_uuid);
        }
        
        console.log(`Cleaned up resources for meeting: ${meeting_uuid}`);
    }
    
    res.sendStatus(200);
});

// Health check endpoint
app.get('/health', (req, res) => {
    res.json({
        status: 'healthy',
        activeMeetings: activeConnections.size,
        activeAgents: meetingAgents.size,
        timestamp: new Date().toISOString()
    });
});

// Start server
app.listen(port, () => {
    console.log(`Zoom RTMS + SRE Integration Server running at http://localhost:${port}`);
    console.log(`Webhook endpoint: http://localhost:${port}${WEBHOOK_PATH}`);
    console.log(`Health check: http://localhost:${port}/health`);
    console.log('SRE agents will be created automatically when meetings start');
    console.log('');
    console.log('Note: This is a demonstration version with placeholder SRE integration.');
    console.log('To use real SRE functionality, install @smythos/sdk and update the imports.');
});

export default app;
