declare class Pjax {
  options: Pjax.IOptions;

  constructor(options?: Partial<Pjax.IOptions>);

  static switches: {
    [key in DefaultSwitches]: Pjax.Switch
  };

  /**
   * Checks if Pjax is supported by the environment.
   */
  static isSupported: () => boolean;

  log: VoidFunction;

  getElements(el: Element | Document): NodeListOf<Element>;

  parseDOM(el: Element | Document): void;

  refresh: ElementFunction;

  reload: VoidFunction;

  attachLink(el: HTMLAnchorElement): void;

  attachForm(el: HTMLFormElement): void;

  forEachSelectors(cb: ElementFunction, context: Pjax, DOMcontext?: Element | Document): void;

  switchesSelectors(selectors: string[], fromEl: Element | Document, toEl: Element | Document, options: Pjax.IOptions): void;

  latestChance(href: string): void;

  onSwitch: VoidFunction;

  /**
   * Loads the HTML from the response into the DOM.
   *
   * @param {string} html
   * @param {Pjax.IOptions} options
   */
  loadContent(html: string, options: Pjax.IOptions): void;

  /**
   * Aborts an ongoing XHR request.
   *
   * @param {XMLHttpRequest} request
   */
  abortRequest(request: XMLHttpRequest): void;

  /**
   * Makes the XHR request.
   *
   * @param {string} location The URI for the request.
   * @param {Pjax.IOptions | null} options
   * @param {(requestText: string, request: XMLHttpRequest, href: string) => void} callback The callback to call when
   * the response is received. The signature should match that of <code>handleResponse</code>.
   * @returns {XMLHttpRequest}
   */
  doRequest(location: string, options: Pjax.IOptions | null,
            callback: (requestText: string, request: XMLHttpRequest, href: string) => void): XMLHttpRequest;

  /**
   * Saves the state, updates the URL if there were any redirects, then calls loadContent().
   *
   * @param {string} requestText The raw text of the response. Same as <code>request.responseText</code>.
   * @param {XMLHttpRequest} request The XHR object.
   * @param {string} href The original URI used to initiate the request.
   * @param options The Pjax options object used for the request
   */
  handleResponse(requestText: string, request: XMLHttpRequest, href: string, options?: Pjax.IOptions): void;

  /**
   * Initiates the request by calling <code>doRequest()</code>.
   * @param {string} href
   * @param {Pjax.IOptions} options
   */
  loadUrl(href: string, options?: Pjax.IOptions): void;

  /**
   * Called after all switches complete (even async).
   */
  afterAllSwitches: VoidFunction;

  /**
   * Allows reassignment of existing prototype functions to be able to do something before calling the original function.
   * For example:
   *
   * <pre>
   *   pjax._handleResponse = pjax.handleResponse;
   *   pjax.handleResponse = (requestText: string, request: XMLHttpRequest, href: string) => {
   *     return pjax._handleResponse(requestText, request, href);
   *   }
   * </pre>
   */
  [key: string]: Function | Pjax.IOptions;
}

declare namespace Pjax {
  export interface IOptions {
    /**
     * CSS selector to use to retrieve links to apply Pjax to.
     */
    elements: string;

    /**
     * CSS selectors for the elements to replace.
     */
    selectors: string[];

    /**
     * Objects containing callbacks that can be used to switch old elements with new elements.
     * Keys should be one of the defined selectors.
     */
    switches: StringKeyedObject<Switch>;

    /**
     * These are options that can be used during switches.
     * Keys should be one of the defined selectors.
     */
    switchesOptions: StringKeyedObject;

    /**
     * Enable the use of pushState(). Disabling this will prevent Pjax from updating browser history.
     * Internally, this option is used when a popstate event triggers Pjax (to not pushState() again).
     */
    history: boolean;

    /**
     * Function that allows you to add behavior for analytics.
     * By default it tries to track a pageview with Google Analytics (if it exists on the page).
     * It's called every time a page is switched, even for history navigation.
     * Set to false to disable this behavior.
     */
    analytics: Function | false;

    /**
     * When set to an integer, this is the value (in px from the top of the page) to scroll to when a page is switched.
     * When set to an array of 2 integers ([x, y]), this is the value to scroll both horizontally and vertically.
     * Set this to false to disable scrolling, which will mean the page will stay in that same position it was before
     * loading the new elements.
     */
    scrollTo: number | [number, number] | false;

    /**
     * When set to true, attempt to restore the scroll position when navigating backwards or forwards.
     */
    scrollRestoration: boolean;

    /**
     * When set to true, append a timestamp query string segment to the requested URLs in order to skip browser cache.
     */
    cacheBust: boolean;

    /**
     * Enables verbose mode.
     */
    debug: boolean;

    /**
     * The timeout in milliseconds for the XHR requests. Set to 0 to disable the timeout.
     */
    timeout: number;

    /**
     * When set to true, clicking on a link that points to the current URL will trigger a full page reload.
     * (Note that if cacheBust is set to true, the code that checks if the href is the same as the current page's URL
     * will not work, due to the query string appended to force a cache bust).
     */
    currentUrlFullReload: boolean;

    /**
     * Hold the information to make an XHR request.
     */
    requestOptions?: {
      requestUrl?: string;
      requestMethod?: string;
      requestParams?: IRequestParams[];
      formData?: FormData;
    }
  }

  export type Switch = (oldEl: Element, newEl: Element, options?: IOptions, switchesOptions?: StringKeyedObject) => void;

  export interface IRequestParams {
    name: string,
    value: string
  }
}

interface StringKeyedObject<T = any> {
  [key: string]: T
}

type ElementFunction = (el: Element) => void;

declare enum DefaultSwitches {
  innerHTML = "innerHTML",
  ouetrHTML = "outerHTML",
  sideBySide = "sideBySide",
  replaceNode = "replaceNode"
}

export = Pjax;