// From https://github.com/cushion/availability.js/blob/master/availability.js

"use strict";


// Constants
// ===============================================

var MONTH = 2628000000 // as seconds
var BASE_URL = 'https://my.cushionapp.com'
var AVAILABLE = 'available'
var UNAVAILABLE = 'unavailable'
var SOON = 'soon'
var PRIVATE = 'private'



// Availability object
// ===============================================

var Availability = function () {
  this.user = {}
  this.date = null
  this.hours = 0
  this.availability = UNAVAILABLE
}

Availability.prototype.isAvailable = function () { return AVAILABLE === this.availability }
Availability.prototype.isUnavailable = function () { return UNAVAILABLE === this.availability }
Availability.prototype.isSoon = function () { return SOON === this.availability }
Availability.prototype.isPrivate = function () { return PRIVATE === this.availability }

Availability.prototype.monthShort = function () {
  if (!this.date) return
  switch (this.date.getMonth()) {
    case 0:  return 'Jan'
    case 1:  return 'Fév'
    case 2:  return 'Mars'
    case 3:  return 'Avril'
    case 4:  return 'Mai'
    case 5:  return 'Juin'
    case 6:  return 'Juil'
    case 7:  return 'Août'
    case 8:  return 'Sept'
    case 9:  return 'Oct'
    case 10: return 'Nov'
    case 11: return 'Déc'
  }
}

Availability.prototype.month = function () {
  if (!this.date) return
  switch (this.date.getMonth()) {
    case 0:  return 'January'
    case 1:  return 'February'
    case 2:  return 'March'
    case 3:  return 'April'
    case 4:  return 'May'
    case 5:  return 'June'
    case 6:  return 'July'
    case 7:  return 'August'
    case 8:  return 'September'
    case 9:  return 'October'
    case 10: return 'November'
    case 11: return 'December'
  }
}

Availability.prototype.referralUrl = function () {
  if (this.user && this.user.referral_code) {
    return 'http://get.cushionapp.com/' + this.user.referral_code
  }
}



// Main display function
// ===============================================

function display (options) {
  if (!options.user) return console.error('Must specify a user')
  if (!options.render) return console.error('Must specify a render function')

  var availability = new Availability()

  // AJAX Request
  var xhr = new XMLHttpRequest()
  xhr.addEventListener('load', onLoad(availability, options.render))
  xhr.open('GET', BASE_URL + '/api/v1/users/' + options.user + '/availability')
  xhr.send()

  return availability
}

function onLoad (availability, render) {
  return function () {
    switch (this.status) {
      default: return console.error('Cushion API Error', this.status)
      case 404: return console.error('That user ID wasnt found')
      case 401:
        console.error('Enable the Availability Badge: ' + BASE_URL + '/add-ons/availability-badge')
        availability.availability = PRIVATE
        break
      case 200:
        var data = JSON.parse(this.response)
        if (data.user) availability.user = data.user
        if (data.availability) {
          availability.date = parseDate(data.availability.available_on)
          availability.hours = data.availability.hours_per_week
          availability.availability = determineAvailability(availability.date)
        }
        break
    }
    return render.call(availability)
  }
}


// Helpers
// ===============================================

function parseDate (date) {
  date = date.split('-')

  var year = parseInt(date[0])
  var month = parseInt(date[1]) - 1
  var day = parseInt(date[2])

  return new Date(year, month, day)
}

function determineAvailability (date) {
  var diff = date - Date.now()
  if (date && diff < MONTH) return AVAILABLE
  if (date && diff < (10 * MONTH)) return SOON
  return UNAVAILABLE
}

function element (tag) {
  var attrs = Array.prototype.slice.call(arguments, 1)
  var element = document.createElement(tag)
  if (attrs.length > 0) {
    attrs.unshift(element)
    setAttributes.apply(this, attrs)
  }
  return element
}

function append (parent, child) {
  parent.appendChild(child)
  return parent
}

function setAttributes (el) {
  var attrs = Array.apply(null, arguments).slice(1)
  for (var i = attrs.length - 1; i >= 0; i--) {
    if (attrs[i].length === 3) {
      el.setAttributeNS.apply(el, attrs[i])
    } else {
      el.setAttribute.apply(el, attrs[i])
    }
  }
  return el
}



// Ribbon display
// ===============================================

function ribbon (options) {
  var container = options.container || document.body
  var href = options.href

  function relative () {
    switch (this.availability) {
      case AVAILABLE: return 'Disponible'
      case SOON: return 'Disponible en ' + this.monthShort()
      case UNAVAILABLE: return 'Actuellement en mission'
      case PRIVATE: return 'Erreur'
    }
  }

  function render () {
    if (href === undefined) href = '#'

    var wrapper = element('div',
      ['class', 'availability-ribbon ' + this.availability]
    )

    var banner = element(href ? 'a' : 'div',
      ['href', href],
      ['target', '_blank'],
      ['class', 'availability-ribbon__banner']
    )
    append(wrapper, banner)

    var availability = element('span', ['class', 'availability-ribbon__text'])
    availability.textContent = relative.call(this)
    append(banner, availability)

    var powered = element('div', ['class', 'availability-ribbon__power'])
    powered.textContent = 'powered by Cushion'
    append(wrapper, powered)

    append(container, wrapper)
  }

  options.render = render

  return display(options)
}


// Contextual Badge display
// ===============================================

function badge (options) {
  var container = options.container
  var href = options.href

  function relative () {
    switch (this.availability) {
      case AVAILABLE: return 'available'
      case SOON: return 'booked until ' + this.month()
      case UNAVAILABLE: return 'unavailable'
      case PRIVATE: return 'error'
    }
  }

  options.render = function () {
    if (href === undefined) href = this.referralUrl()

    var badge = element(href ? 'a' : 'span',
      ['class', 'availability-badge ' + this.availability]
    )

    if (href) {
      badge.href = href
      badge.target = '_blank'
    }
    badge.textContent = relative.call(this)

    append(container, badge)
  }

  return display(options)
}



// Exports
// ===============================================

if (typeof window !== 'undefined') {
  // If we're running in the browser set up automatically
  document.addEventListener('DOMContentLoaded', function () {
    var el = document.querySelector('script[data-user]')
    if (!el) return
    var user = el.getAttribute('data-user')
    var badgeEl = document.querySelector('[data-availability-badge]')
    if (badgeEl) {
      badge({ user: user, container: badgeEl })
    } else {
      ribbon({ user: user })
    }
  })
}