/**
 * Server Metrics Collector Service
 * Recolhe métricas de todos os servidores (Hetzner API + SSH)
 * @author Descomplicar® | @link descomplicar.pt | @copyright 2026
 */
import db from '../db.js'
import { collectAllMetrics as collectHetznerMetrics } from './hetzner.js'

// Hetzner API Configuration
const HETZNER_API_URL = 'https://api.hetzner.cloud/v1'
const HETZNER_TOKEN = process.env.HETZNER_TOKEN || ''

// SSH Configuration (from MCP ssh-unified)
interface SSHServer {
  name: string
  monitorName: string
  host: string
  user: string
  pass: string
}

const SSH_SERVERS: SSHServer[] = [
  {
    name: 'server',
    monitorName: 'CWP Server',
    host: process.env.SERVER_HOST || '176.9.3.158',
    user: process.env.SERVER_USER || 'root',
    pass: process.env.SERVER_PASS || ''
  },
  {
    name: 'easy',
    monitorName: 'EasyPanel',
    host: process.env.EASY_HOST || '178.63.18.51',
    user: process.env.EASY_USER || 'root',
    pass: process.env.EASY_PASS || ''
  }
]

// Hetzner server mapping to monitoring table
const HETZNER_MAPPING: Record<string, string> = {
  'gateway': 'MCP Hub',
  'meet': 'Meet',
  'whatsapp.descomplicar.pt': 'WhatsApp',
  'whatsms': 'WhatSMS'
}

interface ServerMetrics {
  cpu: number
  ram: number
  disk: number
  load: number
  containers?: number
}

/**
 * Parse SSH metrics output
 */
function parseSSHMetrics(output: string): ServerMetrics {
  const lines = output.split('\n')
  const metrics: ServerMetrics = { cpu: 0, ram: 0, disk: 0, load: 0 }

  for (const line of lines) {
    if (line.startsWith('CPU:')) metrics.cpu = parseFloat(line.split(':')[1]) || 0
    if (line.startsWith('MEM:')) metrics.ram = parseFloat(line.split(':')[1]) || 0
    if (line.startsWith('DISK:')) metrics.disk = parseFloat(line.split(':')[1]) || 0
    if (line.startsWith('LOAD:')) metrics.load = parseFloat(line.split(':')[1]) || 0
    if (line.startsWith('CONTAINERS:')) metrics.containers = parseInt(line.split(':')[1]) || 0
  }

  return metrics
}

/**
 * Execute SSH command via subprocess (since we can't use MCP from here)
 * This is a placeholder - in production, use the MCP or a proper SSH library
 */
async function executeSSH(server: SSHServer, command: string): Promise<string> {
  // For now, we'll use the database values or call an external endpoint
  // In production, you'd use ssh2 library or call the MCP endpoint
  const { exec } = await import('child_process')
  const { promisify } = await import('util')
  const execAsync = promisify(exec)

  try {
    // Use sshpass for password-based auth (not ideal but works for internal servers)
    const sshCommand = `sshpass -p '${server.pass}' ssh -o StrictHostKeyChecking=no -o ConnectTimeout=10 ${server.user}@${server.host} "${command}"`
    const { stdout } = await execAsync(sshCommand, { timeout: 30000 })
    return stdout
  } catch (error) {
    console.error(`SSH error for ${server.name}:`, error)
    return ''
  }
}

/**
 * Collect metrics from SSH servers (CWP, EasyPanel)
 */
export async function collectSSHMetrics(): Promise<{ success: number; failed: number }> {
  let success = 0
  let failed = 0

  const metricsCommand = `echo "CPU:$(top -bn1 | grep 'Cpu(s)' | awk '{print $2}')"; echo "MEM:$(free -m | awk '/Mem:/ {printf "%.1f", $3/$2*100}')"; echo "DISK:$(df -h / | awk 'NR==2 {print $5}' | tr -d '%')"; echo "LOAD:$(cat /proc/loadavg | awk '{print $1}')"; echo "CONTAINERS:$(docker ps -q 2>/dev/null | wc -l || echo 0)"`

  for (const server of SSH_SERVERS) {
    try {
      const output = await executeSSH(server, metricsCommand)
      if (!output) {
        failed++
        continue
      }

      const metrics = parseSSHMetrics(output)

      // Update monitoring table
      await db.query(
        `UPDATE tbl_eal_monitoring
         SET details = ?, status = 'up', last_check = NOW()
         WHERE category = 'server' AND name = ?`,
        [
          JSON.stringify({
            cpu: metrics.cpu,
            ram: metrics.ram,
            disk: metrics.disk,
            load: metrics.load
          }),
          server.monitorName
        ]
      )

      // Update containers if EasyPanel
      if (server.name === 'easy' && metrics.containers !== undefined) {
        // Get current container stats
        const containerOutput = await executeSSH(server, 'docker ps -a --format "{{.Status}}" | grep -c "Up" || echo 0; docker ps -aq | wc -l')
        const [up, total] = containerOutput.trim().split('\n').map(n => parseInt(n) || 0)
        const down = total - up

        await db.query(
          `UPDATE tbl_eal_monitoring
           SET details = ?, status = ?, last_check = NOW()
           WHERE category = 'container' AND name = 'EasyPanel Containers'`,
          [
            JSON.stringify({ total, up, down, restarting: 0 }),
            down > 0 ? 'warning' : 'ok'
          ]
        )
      }

      success++
      console.log(`✅ ${server.monitorName}: CPU=${metrics.cpu}%, RAM=${metrics.ram}%, Disk=${metrics.disk}%`)

    } catch (error) {
      console.error(`❌ Failed to collect metrics from ${server.name}:`, error)
      failed++
    }
  }

  return { success, failed }
}

/**
 * Sync Hetzner metrics to monitoring table
 */
export async function syncHetznerToMonitoring(): Promise<number> {
  // First collect fresh Hetzner metrics
  await collectHetznerMetrics()

  // Then sync to monitoring table
  let synced = 0

  for (const [hetznerName, monitorName] of Object.entries(HETZNER_MAPPING)) {
    const namePattern = hetznerName.includes('.') ? hetznerName : `${hetznerName}%`

    const [result] = await db.query<any[]>(`
      UPDATE tbl_eal_monitoring m
      JOIN v_eal_hetzner_latest h ON h.name LIKE ?
      SET m.details = JSON_OBJECT(
          'cpu', ROUND(h.cpu_percent, 1),
          'ram', 0,
          'disk', 0,
          'load', ROUND(h.cpu_percent / 25, 2),
          'network_in', h.network_in_bps,
          'network_out', h.network_out_bps,
          'hetzner_id', h.hetzner_id
      ),
      m.status = 'up',
      m.last_check = NOW()
      WHERE m.category = 'server' AND m.name = ?
    `, [hetznerName.includes('.') ? hetznerName : hetznerName, monitorName])

    if ((result as any).affectedRows > 0) synced++
  }

  return synced
}

/**
 * Collect all server metrics (Hetzner + SSH)
 */
export async function collectAllServerMetrics(): Promise<{
  hetzner: { success: number; failed: number }
  ssh: { success: number; failed: number }
  synced: number
}> {
  console.log('[METRICS] Starting server metrics collection...')

  // Collect SSH metrics (CWP, EasyPanel)
  const ssh = await collectSSHMetrics()
  console.log(`[SSH] ${ssh.success} OK, ${ssh.failed} failed`)

  // Collect and sync Hetzner metrics
  const synced = await syncHetznerToMonitoring()
  console.log(`[HETZNER] ${synced} servers synced to monitoring`)

  return {
    hetzner: { success: synced, failed: 4 - synced },
    ssh,
    synced
  }
}