/* global GOVUK, $, ga */

(function () {
  'use strict'
  window.GOVUK = window.GOVUK || {}
  var StaticAnalytics = function (config) {
    // Create universal tracker
    // https://github.com/alphagov/govuk_frontend_toolkit/blob/master/docs/analytics.md
    // https://github.com/alphagov/govuk_frontend_toolkit/blob/master/javascripts/govuk/analytics/analytics.js
    var consentCookie = window.GOVUK.getConsentCookie()

    if (!consentCookie || consentCookie.usage) {
      this.analytics = new GOVUK.Analytics(config)
    }

    var trackingOptions = getOptionsFromCookie()

    // We're setting the client ID inside a callback function because
    // we don't have access to the client ID until GA returns a tracker object.
    ga(function (tracker) {
      this.gaClientId = tracker.get('clientId')

      $(window).trigger('gaClientSet')

      // Start up ecommerce tracking
      GOVUK.Ecommerce.start()

      // Track initial pageview
      this.trackPageview(null, null, trackingOptions)

      // Begin error and print tracking
      GOVUK.analyticsPlugins.error({ filenameMustMatch: /gov\.uk/ })
      GOVUK.analyticsPlugins.printIntent()
      GOVUK.analyticsPlugins.mailtoLinkTracker()
      GOVUK.analyticsPlugins.externalLinkTracker({
        externalLinkUploadCustomDimension: 36
      })
      GOVUK.analyticsPlugins.downloadLinkTracker({
        selector: 'a[href*="/government/uploads"], a[href*="assets.publishing.service.gov.uk"]'
      })
    }.bind(this))
  }

  StaticAnalytics.load = function () {
    GOVUK.Analytics.load()
  }

  StaticAnalytics.prototype.trackPageview = function (path, title, options) {
    // Add the cookie banner status as a custom dimension
    var cookieBannerShown = !this.getCookie('seen_cookie_message')
    var cookieBannerDimension = { dimension100: cookieBannerShown ? cookieBannerShown.toString() : 'false' }
    $.extend(options, cookieBannerDimension)

    var trackingOptions = GOVUK.CustomDimensions.getAndExtendDefaultTrackingOptions(options)
    this.analytics.trackPageview(path, title, trackingOptions)
  }

  StaticAnalytics.prototype.trackEvent = function (category, action, options) {
    var trackingOptions = GOVUK.CustomDimensions.getAndExtendDefaultTrackingOptions(options)
    this.analytics.trackEvent(category, action, trackingOptions)
  }

  StaticAnalytics.prototype.setDimension = function (index, value, name, scope) {
    if (typeof value === 'undefined') {
      return
    }
    this.analytics.setDimension(index, value, name, scope)
  }

  StaticAnalytics.prototype.trackShare = function (network) {
    var trackingOptions = GOVUK.CustomDimensions.getAndExtendDefaultTrackingOptions()
    this.analytics.trackShare(network, trackingOptions)
  }

  StaticAnalytics.prototype.addLinkedTrackerDomain = function (trackerId, name, domain, sendPageView) {
    this.analytics.addLinkedTrackerDomain(trackerId, name, domain, sendPageView)
  }

  StaticAnalytics.prototype.setOptionsForNextPageview = function (options) {
    if (typeof options !== 'object') {
      return
    }

    var cookieOptions = getOptionsFromCookie()

    $.extend(cookieOptions, options)

    this.setCookie('analytics_next_page_call', cookieOptions)
  }

  StaticAnalytics.prototype.setCookie = function (cookieName, object) {
    if (!GOVUK.cookie) {
      return
    }

    if (!object) {
      GOVUK.cookie(cookieName, null)
    } else {
      // Singly-stringified JSON sometimes gets escaped when put into a cookie, but inconsistently. The command-line
      // tests will escape, but browser tests will not. Double-stringify in order to get consistently-escaped strings.
      GOVUK.cookie(cookieName, JSON.stringify(JSON.stringify(object)))
    }
  }

  StaticAnalytics.prototype.getCookie = function (cookieName) {
    if (!GOVUK.cookie) {
      return
    }

    try {
      return JSON.parse(JSON.parse(GOVUK.cookie(cookieName)))
    } catch (error) {
      return null
    }
  }

  StaticAnalytics.prototype.stripPII = function (value) {
    return this.analytics.pii.stripPII(value)
  }

  function getOptionsFromCookie () {
    try {
      var cookie = StaticAnalytics.prototype.getCookie('analytics_next_page_call')
      StaticAnalytics.prototype.setCookie('analytics_next_page_call', null)
      return cookie || {}
    } catch (e) {
      return {}
    }
  }

  GOVUK.StaticAnalytics = StaticAnalytics
})()