'use strict'

const os = require('os')
const fs = require('fs')
const path = require('path')
const homedir = require('homedir')
const Store = require('./store')
const phantomloader = require('./phantomloader')
const webserver = require('./webserver')
const Cookies = require('./cookies')
const Headers = require('./headers')
const Login = require('./login')
const proxy = require('./proxy')

// file & directory names
const DATA_DIR = '.alexis'
const PHANTOMFILE = os.platform() === 'win32' ? 'phantomjs.exe' : 'phantomjs'

// computes the data directory
const getDataDir = () => path.join(homedir(), DATA_DIR)
// checks if the data directory exists
const checkDataDirExists = () => fs.existsSync(getDataDir())
// creates the data directory
const createDataDir = () => fs.mkdirSync(getDataDir())
// checks if the PhantomJS binary exists
const checkPhantomExist = () => fs.existsSync(path.join(getDataDir(), PHANTOMFILE))
// checks if the given options are valid
const validateOptions = (options, verbose) => {
  let missing = [];
  ['httpPort', 'email', 'pass'].forEach(option => {
    if (!options[option]) missing.push(option)
  })
  if (verbose && missing.length > 0) return missing.join(', ')
  if (missing.length > 0) return false
  return true 
}  
// validate options
const optionsAreValid = (options = {}, invalidOptionsCb) => {
  if (!options.interval) options.interval = 10
  options.interval = options.interval * 1000
  if(!validateOptions(options)) {
    invalidOptionsCb()
    return false
  }
  return true
}
// checks if data dir exists and creates it if not
const doCreateUserdataDirectory = (data_dir, logger) => {
  if (!checkDataDirExists()) {
    logger.log('SETUP', `Creating data directory: ${data_dir}`)
    createDataDir()
  }
}
// checks if Phantom is installed, downloads it if not
const mountPhantom = async (data_dir, logger) => {
  if (!checkPhantomExist()) {
    phantom_mounted = false
    const phantom_path_name = path.join(data_dir, PHANTOMFILE)
    logger.log('SETUP', 'Downloading Phantom')
    return await Phantom.download(phantom_path_name, data_dir)
  }
  return true
}

// Initializing flow
const run = async (logger, options, invalidOptionsCb) => {
  // helper variable to determine if cookies exist
  let cookies_exist = false
  // helper variable to determine if cookies are valid
  let cookies_valid = false
  // helper variable to determine if login did work
  let login_success = false  
  // init store
  let store = null
  // device data store
  let device_data = null
  // init PhantomJS downlaoder
  const Phantom = phantomloader(logger)
  // cache data dir location
  const data_dir = getDataDir()

  // validate options
  if (!optionsAreValid(options, invalidOptionsCb)) return false

  // set up redux store
  logger.log('SETUP', 'Creating in-memory store')  
  store = Store()

  // check if data dir exists, else create
  doCreateUserdataDirectory(data_dir, logger)

  // checks if Phantom is installed, downloads it if not
  const phantom_mounted = await mountPhantom(data_dir, logger)

  // check if phantom is mounted
  if (phantom_mounted !== true) {
    logger.log('ERROR', 'Error with mounting Phantom')
    return false
  }

  // everythings okay
  logger.log('SETUP', 'Dependency check successful')

  // cookie check
  if (Cookies.checkJsonCookiesExist(data_dir) && Cookies.checkJsonCookiesExist(data_dir)) {
    logger.log('SETUP', 'Cookies exist, trying to reuse them')
    // validate existing cookies
    try {
      cookies_valid = await Cookies.validateCookie(data_dir)
      device_data = cookies_valid[1]
      cookies_valid = cookies_valid[0]
    } catch (e) {
      cookies_valid = false
    }

    // set flasg & log cookie state
    if (cookies_valid) {
      cookies_exist = true
      login_success = true
      logger.log('SETUP', 'Cookies valid, connection could be established')
    } else {
      cookies_exist = false
      logger.log('SETUP', 'Cookies invalid, connection could not be established')
    }
  }

  // create a new set of cookies by logging in
  if (!cookies_exist) {
    logger.log('SETUP', 'No cookies found or invalid, logging in to create a fresh pair')
    try {
      login_success = await Login.fetchInitialCookies(
        Cookies.getJsonCookiePath(data_dir), 
        Cookies.getRawCookiePath(data_dir),
        Headers.ua,
        options.email,
        options.pass,
        path.join(data_dir, PHANTOMFILE),
      )
    } catch (error) {
      console.log(error)
      if (error === 'captcha') {
        logger.log('ERROR', 'Login failed, we got a captcha notice. Please change your public IP and try again.')
      } else {
        logger.log('ERROR', 'Login failed, please check your credentials')        
      }
      login_success = false
      return false
    }
    // Login should´ve been successful, lets validate
    logger.log('SETUP', 'Login successful')

    // cookie check
    if (Cookies.checkJsonCookiesExist(getDataDir()) && Cookies.checkJsonCookiesExist(getDataDir())) {
      // validate existing cookies
      try {
        cookies_valid = await Cookies.validateCookie(getDataDir())
        device_data = cookies_valid[1]
        cookies_valid = cookies_valid[0]
      } catch (e) {
        cookies_valid = false
      }

      // set flasg & log cookie state
      if (cookies_valid) {
        logger.log('SETUP', 'Cookies valid, connection could be established')
      } else {
        logger.log('SETUP', 'Cookies invalid, connection could not be established')
        return false
      }
    }
  }

  // set up proxy dialer
  const Proxy = await proxy(logger, data_dir, store)

  // initial fetch of data
  logger.log('SETUP', 'Fetching initial data')
  const initial_data = await Proxy.fetchAll()
  logger.log('SETUP', 'Fetch finished')
  
  // start webserver
  logger.log('SETUP', 'Starting webserver')
  try {
    await webserver(logger, options.httpPort, store, Proxy)
  } catch (error) {
    logger.log('ERROR', `Problem starting webserver: ${error}`)
    return false
  }

  // set up scheduler to periodically fetch data
  logger.log('SETUP', `Setting up scheduler with interval: ${options.interval}ms`)

  // display data about the echo devices we found
  logger.log('ECHO', `Found ${device_data.devices.length} Device(s) connected with this account`)  
  device_data.devices.forEach(device => {
    logger.log('ECHO', `---------------------------------`)
    logger.log('ECHO', `Name: ${device.accountName}`) 
    logger.log('ECHO', `Id: ${device.deviceAccountId}`)
    logger.log('ECHO', `Type: ${device.deviceFamily}`)
    logger.log('ECHO', `Active: ${device.online}`)
    logger.log('ECHO', `Mac Address: ${device.macAddress}`)
  })
  logger.log('ECHO', `---------------------------------`)

  // setup done, system is ready to use
  logger.log('SETUP', 'Setup finished. Ready to use. Have Fun!')
  return true
}

module.exports = (logger) => {
  return {
    getDataDir,
    checkDataDirExists,
    createDataDir,
    checkPhantomExist,
    run: run.bind(this, logger)
  }
}