import { subMinutes } from 'date-fns'
import * as unifiController from './unifiController'
import * as ciscoController from './ciscoController'

import prisma from '../prisma'

import { pubsub, USER_PRESENCE_UPDATED, ACCESS_POINTS_UPDATED } from '../pubsub'
import { logError, logInfo, logLow, logSuccess } from './logger'

import { performance } from 'perf_hooks'

const RECENT_THRESHOLD_IN_MINUTES = 2

const OLD_DEVICES_THRESHOLD_IN_DAYS = 90

const TIMEOUT_IN_MILLISECONDS = process.env.TASK_TIMEOUT || 120000

let working = false

const wifiControllers = [unifiController, ciscoController]

async function getOnlineDevices() {
  const onlineDevicesPromises = wifiControllers.map(wifiController =>
    wifiController.getOnlineWifiDevices()
  )

  const onlineDevices = (await Promise.all(onlineDevicesPromises)).flat()

  return onlineDevices
}

async function updateDevicesStatus(onlineDevices) {
  const lastSeenThreshold = subMinutes(new Date(), RECENT_THRESHOLD_IN_MINUTES)

  const onlineDevicesMacs = onlineDevices.map(device => device.mac)

  const recent = prisma.wifiDevice.updateMany({
    where: {
      lastSeen: { gt: lastSeenThreshold },
      status: 'ONLINE',
      mac: { notIn: onlineDevicesMacs }
    },
    data: { status: 'RECENT' }
  })

  const offline = prisma.wifiDevice.updateMany({
    where: {
      lastSeen: { lte: lastSeenThreshold },
      status: { not: 'OFFLINE' },
      mac: { notIn: onlineDevicesMacs }
    },
    data: { status: 'OFFLINE' }
  })

  return prisma.$transaction([recent, offline])
}

async function forceUserDisconnect(mac) {
  try {
    await prisma.wifiDevice.update({
      where: { mac },
      data: {
        user: {
          disconnect: true
        }
      }
    })
  } catch (e) {
    logError({
      tags: ['wifiDevices'],
      message: `Erro tentando desconectar o usuário do dispositivo "${mac}".`,
      data: { error: e, mac }
    })
  }
}

function mockHostName({ mac, oui }) {
  const shortOui = oui?.split(' ')[0] || 'desc'
  const clearMac = mac ? mac.replaceAll(':', '') : ''

  return `${shortOui}_${clearMac}`
}

async function updateDB(onlineDevices) {
  const devicesUpsertPromises = onlineDevices.map(async device => {
    if (!device.user) forceUserDisconnect(device.mac)

    const user = device.user
      ? {
          connect: {
            sAMAccountName: device.user.replace('IFMS\\', '').toLowerCase()
          }
        }
      : undefined

    const hostname = device.hostname || mockHostName(device)

    return prisma.wifiDevice
      .upsert({
        where: { mac: device.mac },
        create: {
          ...device,
          hostname,
          firstSeen: device.firstSeen || new Date(),
          user,
          accessPoint: {
            connect: {
              hostname: device.apName
            }
          }
        },
        update: {
          ...device,
          hostname,
          user,
          accessPoint: {
            connect: {
              hostname: device.apName
            }
          }
        }
      })
      .catch(async e => {
        // If is a binding problem, probably the device has an user outside of AD, so save it anyway...
        if (e.code == 'P2025')
          try {
            await forceUserDisconnect(device.mac)
            await prisma.wifiDevice.upsert({
              where: { mac: device.mac },
              create: {
                ...device,
                hostname,
                firstSeen: device.firstSeen || new Date(),
                user: undefined,
                accessPoint: {
                  connect: {
                    hostname: device.apName
                  }
                }
              },
              update: {
                ...device,
                hostname,
                user: undefined,
                accessPoint: {
                  connect: {
                    hostname: device.apName
                  }
                }
              }
            })
          } catch (e) {
            logError({
              tags: ['wifiDevices'],
              message: `Erro ao adicionar o dispositivo "${device.mac}" AP: ${device.apMac}. Ele tinha um usuário fora do AD que foi ignorado, mas falhou mesmo assim. ${e.message} `,
              data: { error: e, device }
            })
          }
        else
          logError({
            tags: ['wifiDevices'],
            message: `Erro tentando adicionar o dispositivo "${device.mac}: ${e.message}".`,
            data: { error: e, device }
          })
      })
  })

  return Promise.allSettled(devicesUpsertPromises)
}

function updateDevicesInfo() {
  return new Promise(async (resolve, reject) => {
    if (working) return reject('A última atualização ainda não terminou')

    working = true

    const updateTimeout = setTimeout(() => {
      reject('A função atingiu seu tempo limite.')
      working = false
    }, TIMEOUT_IN_MILLISECONDS)

    try {
      const startTime = performance.now()

      const onlineDevices = await getOnlineDevices()

      await updateDevicesStatus(onlineDevices)

      const endTime = performance.now()

      const startTimeDB = performance.now()

      await updateDB(onlineDevices)
      const endTimeDB = performance.now()

      onlineDevices.length > 0
        ? resolve(
            `${onlineDevices.length} atualizados em ${Math.floor(
              endTime - startTime
            )}ms, DB em ${Math.floor(endTimeDB - startTimeDB)}ms`
          )
        : reject('Não há dispositivos conectados no momento.')

      pubsub.publish(USER_PRESENCE_UPDATED, {
        userPresenceUpdated: onlineDevices.length
      })

      const updatedDbAccessPoints = await prisma.accessPoint.findMany({
        include: {
          wifiDevices: {
            where: {
              status: 'ONLINE'
            }
          }
        }
      })

      pubsub.publish(ACCESS_POINTS_UPDATED, {
        accessPointsUpdated: updatedDbAccessPoints
      })

      logSuccess({
        tags: ['wifiDevices'],
        message: `${onlineDevices.length} dispositivos Wi-Fi atualizados em 
        ${((endTime - startTime) / 1000).toFixed(2)}s. BD em ${(
          (endTimeDB - startTimeDB) /
          1000
        ).toFixed(2)}s`
      })
    } catch (e) {
      logError({
        tags: ['wifiDevices'],
        message: `Erro atualizando dispositivos Wi-Fi: ${e.message}`,
        data: e
      })

      reject('Não foi possível atualizar as informações dos dispositivos.')
    } finally {
      working = false
      clearTimeout(updateTimeout)
    }
  })
}

// Delete devices that are offline for more than OLD_DEVICES_THRESHOLD_IN_DAYS days
async function deleteOldDevices() {
  const oldDevicesThresholdInMilliseconds =
    OLD_DEVICES_THRESHOLD_IN_DAYS * 24 * 60 * 60 * 1000

  const oldDevices = await prisma.wifiDevice.deleteMany({
    where: {
      lastSeen: {
        lt: new Date(Date.now() - oldDevicesThresholdInMilliseconds)
      },
      status: 'OFFLINE'
    }
  })

  if (oldDevices.count > 0)
    logInfo({
      tags: ['wifiDevices', 'deleteOldDevices'],
      message: `${oldDevices.count} dispositivos Wi-Fi não vistos há mais de ${OLD_DEVICES_THRESHOLD_IN_DAYS} dias foram excluídos.`,
      data: { oldDevices }
    })
  else
    logInfo({
      tags: ['wifiDevices', 'deleteOldDevices'],
      message: `Nenhum dispositivo Wi-Fi não visto há mais de ${OLD_DEVICES_THRESHOLD_IN_DAYS} dias foi encontrado.`
    })
}

export { updateDevicesInfo, deleteOldDevices }