import express from 'express'
import cors from 'cors'
import helmet from 'helmet'
import Redis from 'ioredis'
import { v4 as uuidv4 } from 'uuid'

const app = express()
app.use(cors())
app.use(helmet())
app.use(express.json())

// ─── Redis ──────────────────────────────────────────────────────────
const redis = new Redis({ host: 'redis', port: 6379, lazyConnect: true })
redis.on('error', (err) => console.error('[Redis] error:', err.message))
redis.on('ready', () => console.log('[Redis] conectado'))

// ─── Task Queue ─────────────────────────────────────────────────────
const TASK_QUEUE = 'dev-tasks'
const LOG_CHANNEL = 'dev-logs'

function log(level, msg) {
  const line = JSON.stringify({ ts: new Date().toISOString(), level, msg })
  redis.publish(LOG_CHANNEL, line).catch(() => {})
  console.log(`[${level}] ${msg}`)
}

// GET  /tasks        — lista todas
// POST /tasks        — cria tarefa
// PUT  /tasks/:id    — atualiza status
// GET  /agents       — lista agentes conectados
// GET  /logs/:limit  — logs recentes

app.get('/tasks', async (_req, res) => {
  const keys = await redis.keys('task:*')
  const tasks = []
  for (const k of keys) {
    const t = await redis.get(k)
    if (t) tasks.push(JSON.parse(t))
  }
  tasks.sort((a, b) => b.updated_at?.localeCompare(a.updated_at) || 0)
  res.json(tasks)
})

app.post('/tasks', async (req, res) => {
  const id = uuidv4()
  const task = {
    id, title: req.body.title, type: req.body.type || 'feature',
    priority: req.body.priority || 'medium', status: 'todo',
    domain: req.body.domain || 'fullstack', assignee: null,
    created_at: new Date().toISOString(), updated_at: new Date().toISOString(),
  }
  await redis.set(`task:${id}`, JSON.stringify(task))
  await redis.rpush('task-queue', id)
  log('TASK', `Nova tarefa: "${task.title}" [${task.type}]`)
  res.status(201).json(task)
})

app.put('/tasks/:id', async (req, res) => {
  const key = `task:${req.params.id}`
  const raw = await redis.get(key)
  if (!raw) return res.status(404).json({ error: 'Não encontrada' })
  const task = JSON.parse(raw)
  Object.assign(task, req.body, { updated_at: new Date().toISOString() })
  await redis.set(key, JSON.stringify(task))
  log('INFO', `Tarefa atualizada: "${task.title}" status=${task.status}`)
  res.json(task)
})

app.get('/agents', async (_req, res) => {
  const keys = await redis.keys('agent:*')
  const agents = []
  for (const k of keys) {
    const a = await redis.get(k)
    if (a) agents.push(JSON.parse(a))
  }
  res.json(agents)
})

app.get('/health', (_req, res) => {
  res.json({ status: 'ok', ts: new Date().toISOString() })
})

// Promover tarefa automaticamente ao criar/modificar
app.use('*', (req, res) => { res.status(404).json({ error: 'Not found' }) })

const PORT = 3001
app.listen(PORT, '0.0.0.0', () => {
  // Registrar agente backend
  ;(async () => {
    try { await redis.connect() } catch (e) { console.error('Redis connect:', e.message) }
    await redis.set('agent:dev-backend', JSON.stringify({
      id: 'dev-backend', role: 'backend', status: 'online',
      started_at: new Date().toISOString(),
    }))
    log('AGENT', `Backend API online :${PORT}`)
    log('AGENT', `Redis conectado — queue: ${TASK_QUEUE}`)
  })()
})