DemocracyOS/app

import o from 'component-dom'
import spin from 'component-spin'
import t from 't-component'
import View from '../view/view'
import * as validate from './validate/validate'
import autosubmit from './autosubmit/autosubmit'
import autovalidate from './autovalidate/autovalidate'

/**
 * Base Form View
 *
 * @return {FormView} `FormView` instance.
 * @api public
 */
export default class FormView extends View {
  constructor (template, options = {}) {
    super(template, options)
    this.autovalidate('form[autovalidate]')
    this.autosubmit('form[autosubmit]')
    this.on('insert', this.bound('oninsert'))
    this.messages()
  }

  oninsert () {
    this.on('request', this.bound('loading'))
    this.on('response', this.bound('unloading'))
    this.on('response', this.bound('response'))
  }

  removeMessages () {
    this.find('li.msg').remove()
  }

  errors (msg) {
    this.messages(msg, 'error')
  }

  success (msg) {
    this.messages(msg, 'success')
  }

  messages (messages, type, fade) {
    this.removeMessages()
    messages = messages || []
    if (typeof messages === 'string') {
      messages = [messages]
    }

    let ul = this.find('.form-messages')
    if (!ul.length) {
      ul = o('<ul class="form-messages">')
      this.find('form').prepend(ul)
    }

    messages.forEach((msg) => {
      let li = o(document.createElement('li'))
      li.addClass('msg')
      if (type) li.addClass(type)
      if (fade) li.addClass('fade')
      li.html(msg)
      ul.append(li)
    })
  }

  disable () {
    this.disabled = true
    validate.disable(this.el)
  }

  enable () {
    this.disabled = false
    validate.enable(this.el)
  }

  spin () {
    let but = this.find('button')
    if (!but.length) return
    let self = this
    this.spinTimer = setTimeout(() => {
      self.spinner = spin(but[0], { size: 20 }).light()
      but.addClass('spin')
    }, 500)
  }

  unspin () {
    clearTimeout(this.spinTimer)
    if (!this.spinner) return
    this.find('button').removeClass('spin')
    this.spinner.remove()
    this.spinner = null
  }

  loading () {
    let self = this
    this.disable()
    this.messageTimer = setTimeout(() => {
      self.messages(t('form.please-wait'), 'sending')
      self.spin()
      self.find('a.cancel').addClass('enabled')
    }, 1000)
  }

  unloading () {
    clearTimeout(this.messageTimer)
    this.removeMessages()
    this.unspin()
    this.enable()
    this.find('a.cancel').removeClass('enabled')
  }

  response (err, res) {
    if (err) {
      this.emit('error', err)
      return this.errors([err])
    }

    if (!res.ok) {
      err = JSON.parse(res.text)
      this.emit('error', err)
      return this.errors([err.error])
    }

    if (res.body && res.body.error) {
      // Not emitting error on purpose. Fixes #610
      // Request was faulty but not an unexpected error.
      return this.errors([res.body.error])
    }

    this.emit('success', res)
  }

  destroy () {
    clearTimeout(this.messageTimer)
    this.unspin()
  }

  field (name) {
    let strfind = 'input[name="' + name + '"], textarea[name="' + name + '"]'
    return this.find(strfind)
  }

  get (name) {
    let el = this.field(name)
    let chk = el.attr('type') === 'checkbox'
    return chk ? el.attr('checked') : el.val()
  }

  set (field, val) {
    this.field(field).val(val)
  }

  placeholder (field, val) {
    this.field(field).attr('placeholder', val)
  }

  focus (field) {
    this.field(field).focus()
  }

  valid (name, print, fn) {
    fn = typeof fn === 'function' ? fn : print
    print = typeof print === 'boolean' ? print : true
    let fields = autovalidate.validators(this.field(name))
    let val = this.get(name)
    validate.field(name, fields.validations, val, this.el[0], print, fn)
  }

  reset () {
    this.find('form')[0].reset()
  }

  autovalidate (selector) {
    let self = this
    let el = this.find(selector)
    if (!el.length) return
    this.autovalidating = true
    el.on('submit', (e) => {
      e.preventDefault()
      self.emit('submit')
      autovalidate(el, (data) => self.emit('valid', data))
    })
  }

  autosubmit (selector) {
    let self = this
    let el = this.find(selector)
    if (!el.length) return
    let submit = () => {
      self.emit('request')
      let postserialize = self.postserialize ? self.postserialize.bind(self) : null
      let formRequest = autosubmit(el, (err, res) => self.emit('response', err, res), postserialize)
      formRequest.on('abort', self.onCancel.bind(self))
    }

    el.on('submit', () => self.removeMessages())

    if (this.autovalidating) {
      this.on('valid', submit)
    } else {
      el.on('submit', (e) => {
        e.preventDefault()
        self.emit('submit')
        submit()
      })
    }
  }

  onCancel (ev) {
    if (ev) ev.preventDefault()
    this.emit('cancel')
  }
}