const express = require('express')
const http = require('http')
const axios = require('axios')
const WebSocket = require('ws')

const app = express()

const METERED_API_KEY = process.env.METERED_API_KEY
const METERED_DOMAIN = process.env.METERED_DOMAIN

let actualToken = []

// 🚀 GET para que Hugging Face detecte el server
app.get('/', (req, res) => {
  console.log('GET a / recibido')
  res.status(200).json({
    status: 'ok',
    message: '🚀 Project Together Server activo ✅',
    timestamp: new Date().toISOString(),
  })
})

// Endpoint de health check para Hugging Face
app.get('/health', (req, res) => {
  console.log('Health check recibido')
  res.status(200).send('OK')
})

// Endpoint específico para Hugging Face
app.get('/healthz', (req, res) => {
  console.log('Healthz check recibido')
  res.status(200).send('OK')
})

// 🔒 Bloque de CORS solo para peticiones POST
app.use(function (req, res, next) {
  const allowedOrigins = [
    'https://unboring.net',
    'https://0.0.0.0:8080',
    'https://localhost:8080',
    'https://192.168.0.42:8080',
    'https://192.168.0.10:8080',
    'https://arturitu-mixing-realities.hf.space',
    'https://*.hf.space',
  ]
  const origin = req.headers.origin

  if (
    origin &&
    allowedOrigins.some(
      (o) =>
        origin === o || (o.includes('*') && origin.endsWith(o.replace('*', '')))
    )
  ) {
    res.setHeader('Access-Control-Allow-Origin', origin)
  }

  res.header(
    'Access-Control-Allow-Headers',
    'Origin, X-Requested-With, Content-Type, Accept'
  )
  next()
})

// POST para devolver ICE servers
app.post('/', function (req, res) {
  res.json(actualToken)
})

// Crear servidor HTTP
const server = http.createServer(app)

// Crear WebSocket sobre el mismo server
const wss = new WebSocket.Server({ server })

const maxRoomUsers = 2

function callback(ws, message) {
  ws.send(message)
}

function broadcastToRoommates(ws, message, room) {
  wss.clients.forEach((client) => {
    if (client.room && client.room.includes(room)) {
      if (ws !== client && client.readyState === WebSocket.OPEN) {
        client.send(message)
      }
    }
  })
}

function broadcastToAllRoomMembers(ws, message, room) {
  wss.clients.forEach((client) => {
    if (client.room && client.room.includes(room)) {
      if (client.readyState === WebSocket.OPEN) {
        client.send(message)
      }
    }
  })
}

function getRoomUsers(room) {
  let totalRoomUsers = 0
  wss.clients.forEach((client) => {
    if (client.room && client.room.includes(room)) {
      totalRoomUsers += 1
    }
  })
  return totalRoomUsers
}

function setRole(ws, room, actualRoomUsers) {
  let setAsHost = true
  if (actualRoomUsers > 0) {
    setAsHost = false
  }
  wss.clients.forEach((client) => {
    if (client.room && client.room.includes(room) && ws !== client) {
      if (client.host) {
        setAsHost = false
      } else {
        setAsHost = true
      }
    }
  })
  return setAsHost
}

function getIsValidRoom(room) {
  var roomNumber = parseInt(room, 10)
  var regex = /[0-9]/
  var isValid = false
  if (regex.test(room) && roomNumber >= 100000000 && roomNumber <= 999999999) {
    isValid = true
  }
  return isValid
}

// Lógica signaling
wss.on('connection', (ws) => {
  ws.room = []
  ws.host = false

  ws.on('message', (message) => {
    let msgObj
    try {
      msgObj = JSON.parse(message)
    } catch (e) {
      console.error('Mensaje inválido:', e)
      return
    }

    if (msgObj.join) {
      if (!getIsValidRoom(msgObj.join)) {
        let fatalErrorMsg = { type: 'fatalError' }
        callback(ws, JSON.stringify(fatalErrorMsg))
        return
      }
      let actualRoomUsers = getRoomUsers(msgObj.join)
      if (actualRoomUsers < maxRoomUsers) {
        ws.room.push(msgObj.join)
        ws.host = setRole(ws, msgObj.join, actualRoomUsers)
        let joinedMsg = {
          type: 'joined',
          host: ws.host,
        }
        callback(ws, JSON.stringify(joinedMsg))
      } else {
        let fullMsg = { type: 'full' }
        callback(ws, JSON.stringify(fullMsg))
      }
    } else if (msgObj.room) {
      broadcastToRoommates(ws, message, msgObj.room)
    } else if (msgObj.ping) {
      broadcastToRoommates(ws, message, msgObj.room)
    } else if (msgObj.start) {
      let startedMsg = {
        type: 'started',
        room: msgObj.start,
      }
      broadcastToAllRoomMembers(ws, JSON.stringify(startedMsg), msgObj.start)
    } else if (msgObj.close) {
      let closedMsg = {
        type: 'closed',
        room: msgObj.close,
      }
      broadcastToRoommates(ws, JSON.stringify(closedMsg), msgObj.close)
    }
  })

  ws.on('close', () => {
    console.log('Cliente desconectado')
  })
})

// Obtener token ICE inicial y renovar cada hora
async function renewToken() {
  try {
    if (!METERED_API_KEY || !METERED_DOMAIN) {
      console.warn(
        'Missing METERED_API_KEY or METERED_DOMAIN environment variables'
      )
      return
    }

    const response = await axios.get(
      `https://${METERED_DOMAIN}.metered.live/api/v1/turn/credentials?apiKey=${METERED_API_KEY}`
    )
    actualToken = response.data
    console.log('Token ICE actualizado correctamente.')
  } catch (err) {
    console.error('Error al renovar ICE token:', err.message)
    // Continue with empty token if renewal fails
    actualToken = []
  }
}

renewToken()
setInterval(renewToken, 60 * 60 * 1000)

// Iniciar server
// En Hugging Face, usa puerto 7860 explícitamente
const PORT = process.env.SPACE_ID ? 7860 : process.env.PORT || 3000
const HOST = '0.0.0.0' // Escuchar en todas las interfaces de red (importante para Docker)
server.listen(PORT, HOST, () => {
  console.log(`Servidor HTTP y WebSocket escuchando en ${HOST}:${PORT}`)
  console.log(`Variable de entorno PORT: ${process.env.PORT || 'No definida'}`)
  console.log(`En entorno Hugging Face: ${process.env.SPACE_ID ? 'Sí' : 'No'}`)

  // Log todas las variables de entorno para diagnóstico
  console.log('Variables de entorno disponibles:')
  Object.keys(process.env).forEach((key) => {
    if (
      !key.includes('KEY') &&
      !key.includes('SECRET') &&
      !key.includes('TOKEN')
    ) {
      console.log(`${key}: ${process.env[key]}`)
    }
  })
})