require("../polyfills/Function.prototype.bind")

var on = require("../events/on")
var clone = require("../clone")

var attrClick = "data-pjax-click-state"

var formAction = function(el, event) {
  this.options.requestOptions = {
    requestUrl: el.getAttribute("action") || window.location.href,
    requestMethod: el.getAttribute("method") || "GET",
  }

  // create a testable virtual link of the form action
  var virtLinkElement = document.createElement("a");
  virtLinkElement.setAttribute("href", this.options.requestOptions.requestUrl);

  // Ignore external links.
  if (virtLinkElement.protocol !== window.location.protocol || virtLinkElement.host !== window.location.host) {
    el.setAttribute(attrClick, "external");
    return
  }

  // Ignore click if we are on an anchor on the same page
  if (virtLinkElement.pathname === window.location.pathname && virtLinkElement.hash.length > 0) {
    el.setAttribute(attrClick, "anchor-present");
    return
  }

  // Ignore empty anchor "foo.html#"
  if (virtLinkElement.href === window.location.href.split("#")[0] + "#") {
    el.setAttribute(attrClick, "anchor-empty")
    return
  }

  // if declared as a full reload, just normally submit the form
  if (this.options.currentUrlFullReload) {
    el.setAttribute(attrClick, "reload");
    return;
  }

  event.preventDefault()

  var paramObject = [];
  for (var elementKey in el.elements) {
    var element = el.elements[elementKey];
    // jscs:disable disallowImplicitTypeConversion
    if (!!element.name && element.attributes !== undefined && element.tagName.toLowerCase() !== "button") {
      // jscs:enable disallowImplicitTypeConversion
      if ((element.attributes.type !== "checkbox" && element.attributes.type !== "radio") || element.checked) {
        paramObject.push({name: encodeURIComponent(element.name), value: encodeURIComponent(element.value)});
      }
    }
  }

  // Creating a getString
  var paramsString = (paramObject.map(function(value) {return value.name + "=" + value.value;})).join("&");

  this.options.requestOptions.requestPayload = paramObject;
  this.options.requestOptions.requestPayloadString = paramsString;

  el.setAttribute(attrClick, "submit");

  const options = clone(this.options);
  options.triggerElement = el;
  this.loadUrl(virtLinkElement.href, options);
};

var isDefaultPrevented = function(event) {
  return event.defaultPrevented || event.returnValue === false;
};


module.exports = function(el) {
  var that = this

  on(el, "submit", function(event) {
    if (isDefaultPrevented(event)) {
      return
    }

    formAction.call(that, el, event)
  })

  on(el, "keyup", function(event) {
    if (isDefaultPrevented(event)) {
      return
    }


    if (event.keyCode == 13) {
      formAction.call(that, el, event)
    }
  }.bind(this))
}