/* eslint-disable no-throw-literal */
const KoaRouter = require('koa-router')
const router = new KoaRouter()
const fs = require('fs')
const path = require('path')
const Printer = require('../PrinterDev')
const KoaBody = require('koa-body')
const uuid = require('uuid')

router.use(async (c, n) => {
  c.data = {
    title: 'Printer System Setup'
  }
  let status = 1
  try {
    await n()
  } catch (err) {
    status = 0
    if (typeof err === 'string') {
      c.body = err
    } else {
      c.body = err.toString()
    }
  }

  if (c.async) {
    c.body = {
      status,
      msg: c.body
    }
  }
})

router
  .get('/', async (c, n) => {
    c.redirect('/install')
  })
  .get('/install', async (c, n) => {
    // get ttys
    let ttys = await new Promise((resolve, reject) => {
      fs.readdir(path.resolve('/dev'), (err, list) => {
        if (err) return resolve([])
        let arr = []
        for (let it of list) {
          if (/^tty[A-z]/.test(it)) {
            arr.push(path.resolve('/dev', it))
          }
        }
        resolve(arr)
      })
    })
    c.data.ttys = ttys
    await c.render('install/index', c.data)
  })
  .post('/install/printer_test', KoaBody(), async (c, n) => {
    c.async = true
    let arr = c.request.body
    if (!arr.device) throw '請輸入印表機連接埠'
    let device = arr.device
    let feed = arr.feed || 8
    if (!isFinite(feed) || feed < 0) throw '切紙前換行必須是整數'
    feed = typeof feed !== 'number' ? Math.floor(parseInt(feed)) : feed

    Printer.serial = device
    Printer.feed = feed

    let status = await Printer.printTestPage()

    if (!status) c.body = '測試失敗'
    else c.body = '測試成功'
  })
  .post('/install/write_config', KoaBody(), async (c, n) => {
    c.async = true
    let arr = c.request.body
    if (!arr.tty) throw '請輸入印表機連接埠'
    if (!arr.ble || (arr.ble !== 'yes' && arr.ble !== 'no')) throw '請輸入藍牙啟用設定'
    let feed = arr.feed || 8
    if (!isFinite(feed) || feed < 0) throw '切紙前換行必須是整數'
    feed = typeof feed !== 'number' ? Math.floor(parseInt(feed)) : feed

    let json = {
      ble: {
        enable: false,
        uuid: {
          main: '',
          service: '',
          characteristic: ''
        }
      },
      printer: {
        serial: '',
        feed: 8
      },
      api: {
        secret: ''
      }
    }

    json.ble.enable = arr.ble === 'yes'
    json.ble.uuid.main = uuid.v4()
    json.ble.uuid.service = uuid.v4()
    json.ble.uuid.characteristic = uuid.v4()

    json.printer.serial = arr.tty
    json.printer.feed = feed

    json.api.secret = arr.secret || ''

    let wconfig = await new Promise((resolve, reject) => {
      fs.writeFile(path.resolve(process.env.PROJECT_ROOT, 'config.json'), JSON.stringify(json, null, 2), {
        mode: 0o664,
        encoding: 'utf8',
        flag: 'w'
      }, err => {
        if (err) return resolve(false)
        return resolve(true)
      })
    })

    if (!wconfig) throw '設定檔寫入失敗'
    c.body = '設定檔寫入成功'
  })

module.exports = router