/* global _gaq: true, ga: true */

var defaultSwitches = require("../switches")

module.exports = function(options) {
  this.options = options
  this.options.elements = this.options.elements || "a[href], form[action]"
  this.options.selectors = this.options.selectors || ["title", ".js-Pjax"]
  this.options.switches = this.options.switches || {}
  this.options.switchesOptions = this.options.switchesOptions || {}
  this.options.history = this.options.history || true
  this.options.analytics = (typeof this.options.analytics === "function" || this.options.analytics === false) ?
    this.options.analytics :
    function() {
      if (window._gaq) {
        _gaq.push(["_trackPageview"])
      }
      if (window.ga) {
        ga("send", "pageview", {page: location.pathname, title: document.title})
      }
    }
  this.options.scrollTo = (typeof this.options.scrollTo === "undefined") ? 0 : this.options.scrollTo;
  this.options.cacheBust = (typeof this.options.cacheBust === "undefined") ? true : this.options.cacheBust
  this.options.debug = this.options.debug || false
  this.options.timeout = this.options.timeout || 0
  this.options.scrollRestoration = (typeof this.options.scrollRestoration !== "undefined") ? this.options.scrollRestoration : true

  // we can’t replace body.outerHTML or head.outerHTML
  // it create a bug where new body or new head are created in the dom
  // if you set head.outerHTML, a new body tag is appended, so the dom get 2 body
  // & it break the switchFallback which replace head & body
  if (!this.options.switches.head) {
    this.options.switches.head = defaultSwitches.switchElementsAlt
  }
  if (!this.options.switches.body) {
    this.options.switches.body = defaultSwitches.switchElementsAlt
  }
}