/**
 * Tunnel Orchestration Service
 * Manages Cloudflare Tunnels from PoPs to physical infrastructure
 */

import { logger } from '../lib/logger.js'
import { popMappingService } from './pop-mapping.js'

export interface TunnelHealth {
  tunnelId: string
  status: 'HEALTHY' | 'DEGRADED' | 'DOWN'
  latency: number // ms
  packetLoss: number // percentage
  throughput: number // Mbps
  lastChecked: Date
}

export interface LoadBalancer {
  id: string
  tunnelIds: string[]
  algorithm: 'ROUND_ROBIN' | 'LEAST_CONNECTIONS' | 'LATENCY_BASED'
  healthChecks: boolean
}

class TunnelOrchestrationService {
  /**
   * Create tunnel from PoP to datacenter
   */
  async createTunnel(
    popId: string,
    datacenterId: string,
    config: {
      tunnelType: 'PRIMARY' | 'BACKUP' | 'LOAD_BALANCED'
      healthCheck?: any
    }
  ): Promise<string> {
    logger.info('Creating tunnel', { popId, datacenterId, config })

    // In production, this would:
    // 1. Call Cloudflare API to create tunnel
    // 2. Generate tunnel token
    // 3. Deploy cloudflared agent on datacenter
    // 4. Configure routing

    const tunnelId = `tunnel-${popId}-${datacenterId}-${Date.now()}`

    // Store tunnel configuration
    // await this.storeTunnelConfiguration(tunnelId, popId, datacenterId, config)

    return tunnelId
  }

  /**
   * Monitor tunnel health
   */
  async monitorTunnel(tunnelId: string): Promise<TunnelHealth> {
    logger.info('Monitoring tunnel', { tunnelId })

    // In production, this would:
    // 1. Ping tunnel endpoint
    // 2. Measure latency
    // 3. Check packet loss
    // 4. Measure throughput

    return {
      tunnelId,
      status: 'HEALTHY',
      latency: 10,
      packetLoss: 0,
      throughput: 1000,
      lastChecked: new Date(),
    }
  }

  /**
   * Failover to backup tunnel
   */
  async failoverTunnel(
    primaryTunnelId: string,
    backupTunnelId: string
  ): Promise<void> {
    logger.info('Failing over tunnel', { primaryTunnelId, backupTunnelId })

    // In production, this would:
    // 1. Mark primary tunnel as down
    // 2. Update routing to use backup
    // 3. Notify monitoring systems
    // 4. Log failover event
  }

  /**
   * Create load balancer for multiple tunnels
   */
  async loadBalanceTunnels(
    tunnelIds: string[],
    algorithm: 'ROUND_ROBIN' | 'LEAST_CONNECTIONS' | 'LATENCY_BASED' = 'LATENCY_BASED'
  ): Promise<LoadBalancer> {
    logger.info('Creating load balancer', { tunnelIds, algorithm })

    return {
      id: `lb-${Date.now()}`,
      tunnelIds,
      algorithm,
      healthChecks: true,
    }
  }
}

export const tunnelOrchestrationService = new TunnelOrchestrationService()

