/**
 * MCPs Service
 * Ping paralelo aos MCPs via gateway com cache de 60 segundos
 * @author Descomplicar® | @link descomplicar.pt | @copyright 2026
 */

export interface McpStatus {
  name: string
  port: number
  category: string
  enabled: boolean
  status: 'online' | 'offline' | 'disabled' | 'unknown'
  response_time_ms: number | null
  last_check: string
  tools_count?: number
}

export interface McpDashboard {
  gateway_status: 'online' | 'offline'
  total: number
  online: number
  offline: number
  disabled: number
  mcps: McpStatus[]
  auth: {
    method: string
    token_expires: string | null
  }
}

// Lista de MCPs com metadados (extraída de port-map.json e claude.json)
const MCP_LIST: Array<{ name: string; port: number; category: string; enabled: boolean }> = [
  // CRM
  { name: 'desk-crm-v3',          port: 3150, category: 'crm',      enabled: true  },
  { name: 'desk-project-minimal', port: 3153, category: 'crm',      enabled: false },

  // Infra
  { name: 'ssh-unified',          port: 3192, category: 'infra',    enabled: true  },
  { name: 'filesystem',           port: 0,    category: 'infra',    enabled: true  },
  { name: 'chrome-devtools',      port: 0,    category: 'infra',    enabled: true  },

  // AI
  { name: 'lightrag',             port: 3160, category: 'ai',       enabled: true  },
  { name: 'notebooklm',           port: 3190, category: 'ai',       enabled: false },
  { name: 'context7',             port: 3169, category: 'ai',       enabled: false },
  { name: 'replicate',            port: 3176, category: 'ai',       enabled: false },
  { name: 'memory-supabase',      port: 3151, category: 'ai',       enabled: true  },

  // Tools
  { name: 'mcp-time',             port: 3155, category: 'tools',    enabled: true  },
  { name: 'deepl',                port: 3188, category: 'tools',    enabled: true  },
  { name: 'pexels',               port: 3175, category: 'tools',    enabled: false },
  { name: 'vimeo',                port: 3177, category: 'tools',    enabled: false },
  { name: 'drawio',               port: 3184, category: 'tools',    enabled: false },

  // External
  { name: 'google-workspace',     port: 3156, category: 'external', enabled: false },
  { name: 'google-analytics',     port: 3164, category: 'external', enabled: false },
  { name: 'gsc',                  port: 3165, category: 'external', enabled: false },
  { name: 'youtube',              port: 3166, category: 'external', enabled: false },
  { name: 'youtube-research',     port: 3167, category: 'external', enabled: false },
  { name: 'moloni',               port: 3158, category: 'external', enabled: false },
  { name: 'n8n',                  port: 3171, category: 'external', enabled: false },
  { name: 'gitea',                port: 3162, category: 'external', enabled: true  },
  { name: 'stitch',               port: 0,    category: 'external', enabled: false },
  { name: 'design-systems',       port: 0,    category: 'external', enabled: false },

  // Gateway
  { name: 'authentik',            port: 3191, category: 'gateway',  enabled: false },
  { name: 'spaceship',            port: 3189, category: 'gateway',  enabled: false },
  { name: 'puppeteer',            port: 3193, category: 'gateway',  enabled: false },
  { name: 'lighthouse',           port: 3194, category: 'gateway',  enabled: false },

  // Project
  { name: 'carl-mcp',             port: 0,    category: 'project',  enabled: true  },
  { name: 'reonic',               port: 3187, category: 'project',  enabled: false },
]

const GATEWAY_URL = process.env.MCP_GATEWAY_URL ?? 'https://gateway.descomplicar.pt'
const GATEWAY_TOKEN = process.env.MCP_GATEWAY_TOKEN ?? ''
const PING_TIMEOUT_MS = 5000
const CACHE_TTL_MS = 60_000

// Cache em memória
let cache: { data: McpDashboard; timestamp: number } | null = null

function buildHeaders(): Record<string, string> {
  const headers: Record<string, string> = { 'Content-Type': 'application/json' }
  if (GATEWAY_TOKEN) {
    headers['Authorization'] = `Bearer ${GATEWAY_TOKEN}`
  }
  return headers
}

async function pingGatewayHealth(): Promise<boolean> {
  try {
    const controller = new AbortController()
    const timer = setTimeout(() => controller.abort(), PING_TIMEOUT_MS)
    const res = await fetch(`${GATEWAY_URL}/health`, { signal: controller.signal })
    clearTimeout(timer)
    return res.ok
  } catch {
    return false
  }
}

async function pingMcp(name: string): Promise<{ ok: boolean; response_time_ms: number | null }> {
  const start = Date.now()
  try {
    const controller = new AbortController()
    const timer = setTimeout(() => controller.abort(), PING_TIMEOUT_MS)
    const res = await fetch(`${GATEWAY_URL}/v1/${name}/mcp`, {
      method: 'GET',
      headers: buildHeaders(),
      signal: controller.signal,
    })
    clearTimeout(timer)
    const elapsed = Date.now() - start
    // Qualquer resposta HTTP não-5xx conta como online
    return { ok: res.status < 500, response_time_ms: elapsed }
  } catch {
    return { ok: false, response_time_ms: null }
  }
}

export async function getMcpDashboard(): Promise<McpDashboard> {
  // Servir cache se ainda válido
  if (cache !== null && Date.now() - cache.timestamp < CACHE_TTL_MS) {
    return cache.data
  }

  const now = new Date().toISOString()

  // Separar MCPs por tipo para determinar estratégia de ping
  const enabledWithPort = MCP_LIST.filter(m => m.enabled && m.port > 0)
  const enabledLocal    = MCP_LIST.filter(m => m.enabled && m.port === 0)
  const disabledMcps   = MCP_LIST.filter(m => !m.enabled)

  // Ping gateway health + todos os MCPs com porta em paralelo
  const [gatewayResult, ...pingResults] = await Promise.allSettled([
    pingGatewayHealth(),
    ...enabledWithPort.map(m => pingMcp(m.name)),
  ])

  const gatewayStatus: 'online' | 'offline' =
    gatewayResult.status === 'fulfilled' && gatewayResult.value ? 'online' : 'offline'

  // MCPs enabled com porta gateway
  const enabledWithPortStatuses: McpStatus[] = enabledWithPort.map((m, idx) => {
    const result = pingResults[idx]
    const pong = result.status === 'fulfilled'
      ? result.value
      : { ok: false, response_time_ms: null }
    return {
      name: m.name,
      port: m.port,
      category: m.category,
      enabled: true,
      status: pong.ok ? 'online' : 'offline',
      response_time_ms: pong.response_time_ms,
      last_check: now,
    } satisfies McpStatus
  })

  // MCPs enabled locais (sem porta no gateway) — assumir online se enabled
  const enabledLocalStatuses: McpStatus[] = enabledLocal.map(m => ({
    name: m.name,
    port: m.port,
    category: m.category,
    enabled: true,
    status: 'online' as const,
    response_time_ms: null,
    last_check: now,
  }))

  // MCPs disabled — sem ping, estado disabled
  const disabledStatuses: McpStatus[] = disabledMcps.map(m => ({
    name: m.name,
    port: m.port,
    category: m.category,
    enabled: false,
    status: 'disabled' as const,
    response_time_ms: null,
    last_check: now,
  }))

  const allMcps: McpStatus[] = [
    ...enabledWithPortStatuses,
    ...enabledLocalStatuses,
    ...disabledStatuses,
  ]

  // Ordenar por categoria e depois por nome
  allMcps.sort((a, b) => {
    if (a.category !== b.category) return a.category.localeCompare(b.category)
    return a.name.localeCompare(b.name)
  })

  const online       = allMcps.filter(m => m.status === 'online').length
  const offline      = allMcps.filter(m => m.status === 'offline').length
  const disabledCount = allMcps.filter(m => m.status === 'disabled').length

  const data: McpDashboard = {
    gateway_status: gatewayStatus,
    total: allMcps.length,
    online,
    offline,
    disabled: disabledCount,
    mcps: allMcps,
    auth: {
      method: 'dual-layer: IP whitelist + Bearer token',
      token_expires: null,
    },
  }

  cache = { data, timestamp: Date.now() }
  return data
}