_       = require("lodash")
os      = require("os")
fs      = require("fs-extra")
path    = require("path")
Promise = require("bluebird")
pkg     = require("../package.json")
paths   = require("./paths")
log     = require("debug")("cypress:electron")

fs = Promise.promisifyAll(fs)

## ensure we have an electronVersion set in package.json
if not electronVersion = pkg.electronVersion
  throw new Error("Missing 'electronVersion' in ./package.json")

module.exports = {
  checkCurrentVersion: ->
    pathToVersion = paths.getPathToVersion()

    ## read in the version file
    fs.readFileAsync(pathToVersion, "utf8")
    .then (str) ->
      version = str.replace("v", "")

      ## and if it doesn't match the electron version
      ## throw an error
      if version isnt electronVersion
        throw new Error("Currently installed version: '#{version}' does not match electronVersion: '#{electronVersion}")
      else
        process.exit()

  checkExecExistence: ->
    fs.statAsync(paths.getPathToExec())

  move: (src, dest) ->
    ## src  is ./tmp/Cypress-darwin-x64
    ## dest is ./dist/Cypress
    fs.moveAsync(src, dest, {clobber: true})
    .then ->
      ## remove the tmp folder now
      fs.removeAsync(path.dirname(src))

  removeEmptyApp: ->
    ## nuke the temporary blank /app
    fs.removeAsync(paths.getPathToResources("app"))

  packageAndExit: ->
    @package()
    .then =>
      @removeEmptyApp()
    .then ->
      process.exit()

  package: (options = {}) ->
    pkgr    = require("electron-packager")
    icons   = require("@cypress/icons")

    iconPath =  icons.getPathToIcon("cypress")
    log("package icon", iconPath)

    _.defaults(options, {
      dist: paths.getPathToDist()
      dir: "app"
      out: "tmp"
      name: "Cypress"
      platform: os.platform()
      arch: "x64"
      asar: false
      prune: true
      overwrite: true
      electronVersion
      icon: iconPath
    })

    log("packager options %j", options)
    pkgr(options)
    .then (appPaths) ->
      appPaths[0]
    # Promise.resolve("tmp\\Cypress-win32-x64")
    .then (appPath) =>
      ## and now move the tmp into dist
      console.log("moving created file from", appPath)
      console.log("to", options.dist)
      @move(appPath, options.dist)

    .catch (err) ->
      console.log(err.stack)
      process.exit(1)

  ensure: ->
    Promise.join(
      @checkCurrentVersion()
      @checkExecExistence()
    )

  check: ->
    @ensure()
    .bind(@)
    .catch(@packageAndExit)
}