const exec = require('child_process').exec
const path = require('path')
const async = require('async')
const splitLines = require('split-lines')
const mkdirp = require('mkdirp')
const fs = require('fs-extra')

require('colors')

var CFG = require('../config')

let tools = {}

function execGphoto2 (pArgs, pCallback) {
  exec(`gphoto2 ${pArgs}`, function (pErr, pStdout, pStderr) {
    if (pErr) {
      console.log(`[!] Please install gphoto2`.red)
      console.log(`sudo apt-get install gphoto2`.bgMagenta)
      console.log(`[-] Bobinoscope will close in 10 seconds...`)
      setTimeout(function () {
        process.exit(1)
      }, 10000)
      return
    }
    let error = null
    let outInLines = []
    if (/Error/i.test(pStderr)) {
      error = pStderr
    }
    if (pStdout) {
      outInLines = splitLines(pStdout)
    }
    pCallback(error, outInLines)
  })
}

tools.checkVersion = function (pCb) {
  console.log('[-] Checking gphoto2 installation...'.bgBlue)
  execGphoto2('--version', function (pErr, pStdout) {
    console.log(`OK: ${pStdout[0]}`.green)
    pCb()
  })
}

tools.checkCameraConnection = function (pCb) {
  console.log('[-] Checking camera connection...'.bgBlue)
  execGphoto2('--auto-detect', function (pErr, pStdout) {
    let device = pStdout[2]
    if (!device) {
      console.log(`[!] Camera not connected`.red)
      console.log('1. Connect camera via USB'.bgMagenta)
      console.log('2. Turn on the camera'.bgMagenta)
      console.log('3. Maybe - Force manual focus on camera'.bgMagenta)
      console.log(`\n\n[-] Bobinoscope will close in 10 seconds...`)
      setTimeout(function () {
        process.exit(1)
      }, 10000)
      return
    }
    console.log(`OK: ${device}`.green)
    pCb()
  })
}

tools.__takeOnePicture = function (pPath, pCb) {
  execGphoto2(`--capture-image-and-download --filename=${pPath} --force-overwrite`, pCb)
}

tools.takeOnePicture = function (pBoothId, pPictId, pCallback) {
  let destPict = '/tmp/bobine.jpg'
  var destPath = path.join(CFG.paths.original, pBoothId)
  var pictOrig = path.join(destPath, CFG.pictNames[pPictId])

  mkdirp.sync(path.join(CFG.paths.prebuilt, pBoothId))

  tools.__takeOnePicture(destPict, function (pErr) {
    // If error occurs
    if (pErr) return pCallback(pErr)
    mkdirp(destPath, function () {
      fs.copy(destPict, pictOrig, function (pErr) {
        return pCallback(pErr, pictOrig)
      })
    })
  })
}

tools.init = function (pCb) {
  let tasks = []
  tasks.push(tools.checkVersion)
  tasks.push(tools.checkCameraConnection)
  tasks.push(function (pCb) {
    let output = '/tmp/bobine-dummy.jpg'
    console.log('[-] Taking dummy photo...'.bgBlue)
    tools.__takeOnePicture(output, function (pErr) {
      if (pErr) {
        console.log(`[!] Failed to take picture`.red)
        console.log(pErr.grey)
        console.log('1. Add one SDCard into the device')
        console.log('2. Take one picture manually')
        process.exit(1)
      }
      console.log(`OK: ${output}`.green)
      pCb()
    })

    // opn(output)
    // .then(function () {
    //   console.log('OK'.green)
    //   pCb()
    // })
  })

  async.waterfall(tasks, pCb)
}

module.exports = tools