CocoView = require 'views/core/CocoView'
AuthModal = require 'views/core/AuthModal'
template = require 'templates/core/create-account-modal/basic-info-view'
forms = require 'core/forms'
errors = require 'core/errors'
User = require 'models/User'
State = require 'models/State'

###
This view handles the primary form for user details — name, email, password, etc,
and the AJAX that actually creates the user.

It also handles facebook/g+ login, which if used, open one of two other screens:
sso-already-exists: If the facebook/g+ connection is already associated with a user, they're given a log in button
sso-confirm: If this is a new facebook/g+ connection, ask for a username, then allow creation of a user

The sso-confirm view *inherits from this view* in order to share its account-creation logic and events.
This means the selectors used in these events must work in both templates.

This view currently uses the old form API instead of stateful render.
It needs some work to make error UX and rendering better, but is functional.
###

module.exports = class BasicInfoView extends CocoView
  id: 'basic-info-view'
  template: template

  events:
    'change input[name="email"]': 'onChangeEmail'
    'change input[name="name"]': 'onChangeName'
    'change input[name="password"]': 'onChangePassword'
    'click .back-button': 'onClickBackButton'
    'submit form': 'onSubmitForm'
    'click .use-suggested-name-link': 'onClickUseSuggestedNameLink'
    'click #facebook-signup-btn': 'onClickSsoSignupButton'
    'click #gplus-signup-btn': 'onClickSsoSignupButton'

  initialize: ({ @signupState } = {}) ->
    @state = new State {
      suggestedNameText: '...'
      checkEmailState: 'standby' # 'checking', 'exists', 'available'
      checkEmailValue: null
      checkEmailPromise: null
      checkNameState: 'standby' # same
      checkNameValue: null
      checkNamePromise: null
      error: ''
    }
    @listenTo @state, 'change:checkEmailState', -> @renderSelectors('.email-check')
    @listenTo @state, 'change:checkNameState', -> @renderSelectors('.name-check')
    @listenTo @state, 'change:error', -> @renderSelectors('.error-area')
    @listenTo @signupState, 'change:facebookEnabled', -> @renderSelectors('.auth-network-logins')
    @listenTo @signupState, 'change:gplusEnabled', -> @renderSelectors('.auth-network-logins')
  
  # These values are passed along to AuthModal if the user clicks "Sign In" (handled by CreateAccountModal)
  updateAuthModalInitialValues: (values) ->
    @signupState.set {
      authModalInitialValues: _.merge @signupState.get('authModalInitialValues'), values
    }, { silent: true }
    
  onChangeEmail: (e) ->
    @updateAuthModalInitialValues { email: @$(e.currentTarget).val() }
    @checkEmail()
    
  checkEmail: ->
    email = @$('[name="email"]').val()

    if @signupState.get('path') isnt 'student' and (not _.isEmpty(email) and email is @state.get('checkEmailValue'))
      return @state.get('checkEmailPromise')
      
    if not (email and forms.validateEmail(email))
      @state.set({
        checkEmailState: 'standby'
        checkEmailValue: email
        checkEmailPromise: null
      })
      return Promise.resolve()
      
    @state.set({
      checkEmailState: 'checking'
      checkEmailValue: email
      
      checkEmailPromise: (User.checkEmailExists(email)
      .then ({exists}) =>
        return unless email is @$('[name="email"]').val()
        if exists
          @state.set('checkEmailState', 'exists')
        else
          @state.set('checkEmailState', 'available')
      .catch (e) =>
        @state.set('checkEmailState', 'standby')
        throw e
      )
    })
    return @state.get('checkEmailPromise')

  onChangeName: (e) ->
    @updateAuthModalInitialValues { name: @$(e.currentTarget).val() }
    @checkName()

  checkName: ->
    name = @$('input[name="name"]').val()

    if name is @state.get('checkNameValue')
      return @state.get('checkNamePromise')

    if not name
      @state.set({
        checkNameState: 'standby'
        checkNameValue: name
        checkNamePromise: null
      })
      return Promise.resolve()

    @state.set({
      checkNameState: 'checking'
      checkNameValue: name

      checkNamePromise: (User.checkNameConflicts(name)
      .then ({ suggestedName, conflicts }) =>
        return unless name is @$('input[name="name"]').val()
        if conflicts
          suggestedNameText = $.i18n.t('signup.name_taken').replace('{{suggestedName}}', suggestedName)
          @state.set({ checkNameState: 'exists', suggestedNameText })
        else
          @state.set { checkNameState: 'available' }
      .catch (error) =>
        @state.set('checkNameState', 'standby')
        throw error
      )
    })

    return @state.get('checkNamePromise')

  onChangePassword: (e) ->
    @updateAuthModalInitialValues { password: @$(e.currentTarget).val() }

  checkBasicInfo: (data) ->
    # TODO: Move this to somewhere appropriate
    tv4.addFormat({
      'email': (email) ->
        if forms.validateEmail(email)
          return null
        else
          return {code: tv4.errorCodes.FORMAT_CUSTOM, message: "Please enter a valid email address."}
    })
    
    forms.clearFormAlerts(@$el)
    res = tv4.validateMultiple data, @formSchema()
    forms.applyErrorsToForm(@$('form'), res.errors) unless res.valid
    return res.valid
  
  formSchema: ->
    type: 'object'
    properties:
      email: User.schema.properties.email
      name: User.schema.properties.name
      password: User.schema.properties.password
    required: ['name', 'password'].concat (if @signupState.get('path') is 'student' then ['firstName', 'lastName'] else ['email'])
  
  onClickBackButton: -> @trigger 'nav-back'
  
  onClickUseSuggestedNameLink: (e) ->
    @$('input[name="name"]').val(@state.get('suggestedName'))
    forms.clearFormAlerts(@$el.find('input[name="name"]').closest('.form-group').parent())

  onSubmitForm: (e) ->
    @state.unset('error')
    e.preventDefault()
    data = forms.formToObject(e.currentTarget)
    valid = @checkBasicInfo(data)
    return unless valid

    @displayFormSubmitting()
    AbortError = new Error()
    
    @checkEmail()
    .then @checkName()
    .then =>
      if not (@state.get('checkEmailState') in ['available', 'standby'] and @state.get('checkNameState') is 'available')
        throw AbortError

      # update User
      emails = _.assign({}, me.get('emails'))
      emails.generalNews ?= {}
      emails.generalNews.enabled = @$('#subscribe-input').is(':checked') and not _.isEmpty(@state.get('checkEmailValue'))
      me.set('emails', emails)
      
      unless _.isNaN(@signupState.get('birthday').getTime())
        me.set('birthday', @signupState.get('birthday').toISOString())

      me.set(_.omit(@signupState.get('ssoAttrs') or {}, 'email', 'facebookID', 'gplusID'))

      jqxhr = me.save()
      if not jqxhr
        console.error(me.validationError)
        throw new Error('Could not save user')

      return new Promise(jqxhr.then)
    
    .then =>
      # Use signup method
      window.tracker?.identify()
      switch @signupState.get('ssoUsed')
        when 'gplus'
          { email, gplusID } = @signupState.get('ssoAttrs')
          { name } = forms.formToObject(@$el)
          jqxhr = me.signupWithGPlus(name, email, gplusID)
        when 'facebook'
          { email, facebookID } = @signupState.get('ssoAttrs')
          { name } = forms.formToObject(@$el)
          jqxhr = me.signupWithFacebook(name, email, facebookID)
        else
          { name, email, password } = forms.formToObject(@$el)
          jqxhr = me.signupWithPassword(name, email, password)

      return new Promise(jqxhr.then)
      
    .then =>
      { classCode, classroom } = @signupState.attributes
      if classCode and classroom
        return new Promise(classroom.joinWithCode(classCode).then)
      
    .then =>
      @finishSignup()
        
    .catch (e) =>
      @displayFormStandingBy()
      if e is AbortError
        return
      else
        console.error 'BasicInfoView form submission Promise error:', e
        @state.set('error', e.responseJSON?.message or 'Unknown Error')
      
  finishSignup: ->
    @trigger 'signup'

  displayFormSubmitting: ->
    @$('#create-account-btn').text($.i18n.t('signup.creating')).attr('disabled', true)
    @$('input').attr('disabled', true)
    
  displayFormStandingBy: ->
    @$('#create-account-btn').text($.i18n.t('signup.create_account')).attr('disabled', false)
    @$('input').attr('disabled', false)

  onClickSsoSignupButton: (e) ->
    e.preventDefault()
    ssoUsed = $(e.currentTarget).data('sso-used')
    handler = if ssoUsed is 'facebook' then application.facebookHandler else application.gplusHandler
    handler.connect({
      context: @
      success: ->
        handler.loadPerson({
          context: @
          success: (ssoAttrs) ->
            @signupState.set { ssoAttrs }
            { email } = ssoAttrs
            User.checkEmailExists(email).then ({exists}) =>
              @signupState.set {
                ssoUsed
                email: ssoAttrs.email
              }
              if exists
                @trigger 'sso-connect:already-in-use'
              else
                @trigger 'sso-connect:new-user'
        })
    })