/**
 * Monitoring Queries Service
 * @author Descomplicar® | @link descomplicar.pt | @copyright 2026
 */
import db from '../db.js'
import type { RowDataPacket } from 'mysql2'

interface MonitoringItem {
  id: number
  name: string
  category: string
  type: string
  status: string
  details: any
  last_check: string
  created_at: string
  updated_at: string
}

interface CategorySummary {
  category: string
  total: number
  ok: number
  warning: number
  critical: number
}

export async function getMonitoringData() {
  // Get all items
  const [items] = await db.query<RowDataPacket[]>(`
    SELECT * FROM tbl_eal_monitoring
    ORDER BY category, name
  `)

  // Get summary by category
  const [summary] = await db.query<RowDataPacket[]>(`
    SELECT
      category,
      COUNT(*) as total,
      SUM(CASE WHEN status IN ('ok','up') THEN 1 ELSE 0 END) as ok,
      SUM(CASE WHEN status = 'warning' THEN 1 ELSE 0 END) as warning,
      SUM(CASE WHEN status IN ('failed','down') THEN 1 ELSE 0 END) as critical
    FROM tbl_eal_monitoring
    GROUP BY category
  `)

  // Parse details JSON
  const itemsParsed = items.map(item => ({
    ...item,
    details: typeof item.details === 'string' ? JSON.parse(item.details) : item.details
  }))

  // Organize by category
  const data: Record<string, MonitoringItem[]> = {}
  for (const item of itemsParsed) {
    if (!data[item.category]) {
      data[item.category] = []
    }
    data[item.category].push(item)
  }

  // Calculate overall status
  let overall: 'ok' | 'warning' | 'critical' = 'ok'
  let total_critical = 0
  let total_warning = 0

  for (const s of summary as CategorySummary[]) {
    total_critical += s.critical
    total_warning += s.warning
  }

  if (total_critical > 0) overall = 'critical'
  else if (total_warning > 0) overall = 'warning'

  return {
    items: data,
    summary,
    overall,
    stats: {
      total_critical,
      total_warning,
      total_ok: items.length - total_critical - total_warning
    }
  }
}