angular.module('loadingPageApp', []).controller('loadingController', [
  '$scope', '$http', '$window', '$timeout'
  ($scope, $http, $window, $timeout) ->

    $scope.redirectionCounter = 5 #seconds
    $scope.scheduler = null
    $scope.redirectScheduler = null

    #==========================
    # Helpers
    #==========================
    $scope.currentStatus = () ->
      if $scope.appInstance? && $scope.appInstance.id
        if $scope.appInstance.errors && $scope.appInstance.errors.length > 0
          'errors'
        else if $scope.appInstance.status in ['terminating', 'terminated']
          'terminated'
        else if $scope.appInstance.status == 'running' && $scope.appInstance.is_online
          'online'
        else if $scope.appInstance.status in ['provisioning', 'staged']
          'creating'
        else if $scope.appInstance.status == 'updating' || ($scope.appInstance.status == 'running' && !$scope.appInstance.is_online)
          'updating'
        else
          # starting/stopping
          # Note: If 'stopping' and no errors it means that a start has been
          # successfully requested
          'loading'
      else
        'not_found'

    $scope.isProgressBarShown = () ->
      $scope.currentStatus() == 'creating' || $scope.currentStatus() == 'loading'

    $scope.redirectUrl = () ->
      return '/mnoe/launch/#{appInstance.uid}'

    # Return the action progression in percent unit
    # Eg. $scope.progressBarPercent() -> 95%
    $scope.progressBarPercent = () ->
      # Get out of there if the bar is not shown
      if !$scope.isProgressBarShown()
        return 0

      # Get the relevant status from an actionProgress
      # point of view
      realStatus = $scope.appInstance.status
      realStatus = 'provisioning' if realStatus == 'staged'
      realStatus = 'starting' if realStatus == 'restarting'

      # Get the maxDuration (seconds) for the current action
      # In case the app is stopping we consider that a start
      # has been requested. Therefore we add the starting
      # time on top of it
      maxDuration = $scope.appInstance.durations[realStatus]
      maxDuration += $scope.appInstance.durations['starting'] if realStatus == 'stopping'

      # Get the referenceField based on
      # the action being performed
      referenceField = {
      'provisioning': 'created_at',
      'starting': 'started_at',
      'stopping': 'stopped_at',
      }[realStatus]

      # Get the action elapsed time in seconds
      startTime = new Date($scope.appInstance[referenceField])
      endTime = new Date($scope.appInstance.server_time)
      elapsedTime = (endTime.getTime() - startTime.getTime()) / 1000

      # Calculate the percentage
      # Max value is 95% / Min value is 5%
      # Cesar: test should prevent division by 0 and display of "Nan%"
      if (maxDuration > 0)
        percent = Math.round((elapsedTime / maxDuration)*100)
        percent = Math.min(percent, 95)
        percent = Math.max(percent, 5)
      else
        percent = 95

      percent = "#{percent}%"
      return percent

    reloadAppInstance = (_appInstance)->
      q = $http.get($window.location.pathname)
      q.then(
        (success) ->
          angular.copy(success.data, _appInstance)
      )
      return q

    $scope.startAutoRefresh = () ->
      intervalMilliSec = 5 * 1000 # 15s
      # Make sure we cancel any previous
      # scheduler first
      if $scope.scheduler?
        $timeout.cancel($scope.scheduler)

      # Configure the scheduler
      $scope.scheduler = $timeout(->
        reloadAppInstance($scope.appInstance)
        $scope.startAutoRefresh()
      ,intervalMilliSec)

    $scope.stopAutoRefresh = () ->
      if $scope.scheduler?
        $timeout.cancel($scope.scheduler)

    $scope.performRedirection = () ->
      # Then reload the page
      window.location = $scope.redirectUrl()

    $scope.startRedirectCountdown = () ->
      intervalMilliSec = 1 * 1000
      # Make sure we cancel any previous
      # scheduler first
      if $scope.redirectScheduler?
        $timeout.cancel($scope.redirectScheduler)

      # Configure the scheduler
      $scope.redirectScheduler = $timeout(->
        $scope.redirectionCounter -= 1
        $scope.startRedirectCountdown() if $scope.redirectionCounter > 0
        $scope.performRedirection() if $scope.redirectionCounter == 0
      ,intervalMilliSec)


    $scope.stopRedirectCountdown = () ->
      if $scope.redirectScheduler?
        $timeout.cancel($scope.redirectScheduler)
        $scope.redirectionCounter = 5

    #==========================
    # Init
    #==========================
    $scope.init = (data) ->
      console.log(data)
      $scope.appInstance = data

      # Watch status
      $scope.$watch(
        (-> $scope.currentStatus())
      ,(status)->
        # Enable appInstance refresh?
        if status == 'loading' || status == 'creating' || status == 'updating'
          $scope.startAutoRefresh() unless $scope.scheduler
        else
          $scope.stopAutoRefresh() if $scope.scheduler

        # Enable redirection counter?
        if status == 'online'
          $scope.startRedirectCountdown() unless $scope.redirectScheduler
        else
          $scope.stopRedirectCountdown() if $scope.redirectScheduler
      )
])