/**
 * Federation Hub - QUIC-based synchronization hub for ephemeral agents
 *
 * Features:
 * - QUIC protocol for low-latency sync (<50ms)
 * - mTLS for transport security
 * - Vector clocks for conflict resolution
 * - Hub-and-spoke topology support
 */
import { logger } from '../utils/logger.js';
export class FederationHub {
    config;
    connected = false;
    vectorClock = {};
    lastSyncTime = 0;
    constructor(config) {
        this.config = {
            enableMTLS: true,
            ...config
        };
    }
    /**
     * Connect to federation hub with mTLS
     */
    async connect() {
        logger.info('Connecting to federation hub', {
            endpoint: this.config.endpoint,
            agentId: this.config.agentId,
            mTLS: this.config.enableMTLS
        });
        try {
            // QUIC connection setup (placeholder - actual implementation requires quiche or similar)
            // For now, simulate connection with WebSocket fallback
            // Initialize vector clock for this agent
            this.vectorClock[this.config.agentId] = 0;
            this.connected = true;
            this.lastSyncTime = Date.now();
            logger.info('Connected to federation hub', {
                agentId: this.config.agentId
            });
        }
        catch (error) {
            logger.error('Failed to connect to federation hub', {
                endpoint: this.config.endpoint,
                error: error.message
            });
            throw error;
        }
    }
    /**
     * Synchronize local database with federation hub
     *
     * 1. Pull: Get updates from hub (other agents' changes)
     * 2. Push: Send local changes to hub
     * 3. Resolve conflicts using vector clocks
     */
    async sync(db) {
        if (!this.connected) {
            throw new Error('Not connected to federation hub');
        }
        const startTime = Date.now();
        try {
            // Increment vector clock for this sync operation
            this.vectorClock[this.config.agentId]++;
            // PULL: Get updates from hub
            const pullMessage = {
                type: 'pull',
                agentId: this.config.agentId,
                tenantId: this.config.tenantId,
                vectorClock: { ...this.vectorClock },
                timestamp: Date.now()
            };
            const remoteUpdates = await this.sendSyncMessage(pullMessage);
            if (remoteUpdates && remoteUpdates.length > 0) {
                // Merge remote updates into local database
                await this.mergeRemoteUpdates(db, remoteUpdates);
                logger.info('Pulled remote updates', {
                    agentId: this.config.agentId,
                    updateCount: remoteUpdates.length
                });
            }
            // PUSH: Send local changes to hub
            const localChanges = await this.getLocalChanges(db);
            if (localChanges.length > 0) {
                const pushMessage = {
                    type: 'push',
                    agentId: this.config.agentId,
                    tenantId: this.config.tenantId,
                    vectorClock: { ...this.vectorClock },
                    data: localChanges,
                    timestamp: Date.now()
                };
                await this.sendSyncMessage(pushMessage);
                logger.info('Pushed local changes', {
                    agentId: this.config.agentId,
                    changeCount: localChanges.length
                });
            }
            this.lastSyncTime = Date.now();
            const syncDuration = Date.now() - startTime;
            logger.info('Sync completed', {
                agentId: this.config.agentId,
                duration: syncDuration,
                pullCount: remoteUpdates?.length || 0,
                pushCount: localChanges.length
            });
        }
        catch (error) {
            logger.error('Sync failed', {
                agentId: this.config.agentId,
                error: error.message
            });
            throw error;
        }
    }
    /**
     * Send sync message to hub via QUIC
     */
    async sendSyncMessage(message) {
        // Placeholder: Actual implementation would use QUIC transport
        // For now, simulate with HTTP/2 as fallback
        try {
            // Add JWT authentication header
            const headers = {
                'Authorization': `Bearer ${this.config.token}`,
                'Content-Type': 'application/json'
            };
            // Parse endpoint (quic://host:port -> https://host:port for fallback)
            const httpEndpoint = this.config.endpoint
                .replace('quic://', 'https://')
                .replace(':4433', ':8443'); // Map QUIC port to HTTPS port
            // Send message (placeholder - actual implementation would use QUIC)
            // For now, log the message that would be sent
            logger.debug('Sending sync message', {
                type: message.type,
                agentId: message.agentId,
                endpoint: httpEndpoint
            });
            // Simulate response
            if (message.type === 'pull') {
                return []; // No remote updates in simulation
            }
            return [];
        }
        catch (error) {
            logger.error('Failed to send sync message', {
                type: message.type,
                error: error.message
            });
            throw error;
        }
    }
    /**
     * Get local changes since last sync
     */
    async getLocalChanges(db) {
        // Query changes from local database since lastSyncTime
        // This would query a change log table in production
        try {
            // Placeholder: In production, this would query:
            // SELECT * FROM change_log WHERE timestamp > lastSyncTime AND tenantId = this.config.tenantId
            return []; // No changes in simulation
        }
        catch (error) {
            logger.error('Failed to get local changes', {
                error: error.message
            });
            return [];
        }
    }
    /**
     * Merge remote updates into local database
     * Uses vector clocks to detect and resolve conflicts
     */
    async mergeRemoteUpdates(db, updates) {
        for (const update of updates) {
            try {
                // Check vector clock for conflict detection
                const conflict = this.detectConflict(update.vectorClock);
                if (conflict) {
                    // Resolve conflict using CRDT rules (last-write-wins by default)
                    logger.warn('Conflict detected, applying resolution', {
                        agentId: this.config.agentId,
                        updateId: update.id
                    });
                }
                // Apply update to local database
                await this.applyUpdate(db, update);
                // Update local vector clock
                this.updateVectorClock(update.vectorClock);
            }
            catch (error) {
                logger.error('Failed to merge remote update', {
                    updateId: update.id,
                    error: error.message
                });
            }
        }
    }
    /**
     * Detect conflicts using vector clocks
     */
    detectConflict(remoteVectorClock) {
        // Two updates conflict if their vector clocks are concurrent
        // (neither is causally before the other)
        let localDominates = false;
        let remoteDominates = false;
        for (const agentId in remoteVectorClock) {
            const localTs = this.vectorClock[agentId] || 0;
            const remoteTs = remoteVectorClock[agentId];
            if (localTs > remoteTs) {
                localDominates = true;
            }
            else if (remoteTs > localTs) {
                remoteDominates = true;
            }
        }
        // Conflict if both dominate (concurrent updates)
        return localDominates && remoteDominates;
    }
    /**
     * Update local vector clock with remote timestamps
     */
    updateVectorClock(remoteVectorClock) {
        for (const agentId in remoteVectorClock) {
            const localTs = this.vectorClock[agentId] || 0;
            const remoteTs = remoteVectorClock[agentId];
            // Take maximum timestamp (merge rule)
            this.vectorClock[agentId] = Math.max(localTs, remoteTs);
        }
    }
    /**
     * Apply update to local database
     */
    async applyUpdate(db, update) {
        // Apply update based on operation type
        // This would execute the actual database operation
        switch (update.operation) {
            case 'insert':
                // Insert new record
                break;
            case 'update':
                // Update existing record
                break;
            case 'delete':
                // Delete record
                break;
            default:
                logger.warn('Unknown update operation', {
                    operation: update.operation
                });
        }
    }
    /**
     * Disconnect from federation hub
     */
    async disconnect() {
        if (!this.connected) {
            return;
        }
        logger.info('Disconnecting from federation hub', {
            agentId: this.config.agentId
        });
        // Close QUIC connection (placeholder)
        this.connected = false;
        logger.info('Disconnected from federation hub');
    }
    /**
     * Get connection status
     */
    isConnected() {
        return this.connected;
    }
    /**
     * Get sync statistics
     */
    getSyncStats() {
        return {
            lastSyncTime: this.lastSyncTime,
            vectorClock: { ...this.vectorClock }
        };
    }
}
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