export interface VirtualMethods {
  /**
   * Object with cached slides HTML elements
   */
  cache: object;

  /**
   * Index of first rendered slide
   */
  from: number;

  /**
   * Index of last rendered slide
   */
  to: number;

  /**
   * Array with slide items passed by virtual.slides parameter
   */
  slides: any[];

  /*
   * Methods
   */

  /**
   * Append slide. slides can be a single slide item or array with such slides.
   */
  appendSlide(slide: HTMLElement | string | HTMLElement[] | string[]): void;

  /**
   * Prepend slide. slides can be a single slide item or array with such slides.
   */
  prependSlide(slide: HTMLElement | string | HTMLElement[] | string[]): void;

  /**
   * Remove specific slide or slides. slideIndexes can be a number with slide index to remove or array with indexes.
   */
  removeSlide(slideIndexes: number[]): void;

  /**
   * Remove all slides
   */
  removeAllSlides(): void;

  /**
   * Update virutal slides state
   */
  update(): void;
}

export interface VirtualEvents {}

export interface VirtualData {
  /**
   * slides left/top offset in px
   */
  offset: number;
  /**
   * index of first slide required to be rendered
   */
  from: number;
  /**
   * index of last slide required to be rendered
   */
  to: number;
  /**
   * array with slide items to be rendered
   */
  slides: any[];
}

export interface VirtualOptions {
  /**
   * Array with slides
   *
   * @default []
   */
  slides?: any[];
  /**
   * Enables DOM cache of rendering slides html elements. Once they are rendered they will be saved to cache and reused from it.
   *
   * @default true
   */
  cache?: boolean;
  /**
   * Increases amount of pre-rendered slides before active slide
   *
   * @default 0
   */
  addSlidesBefore?: number;
  /**
   * Increases amount of pre-rendered slides after active slide
   *
   * @default 0
   */
  addSlidesAfter?: number;
  /**
   * Function to render slide. As an argument it accepts current slide item for slides array and index number of the current slide. Function must return an outter HTML of the swiper slide.
   *
   * @default null
   */
  renderSlide?: (slide: any, index: any) => any;
  /**
   * Function for external rendering (e.g. using some other library to handle DOM manipulations and state like React.js or Vue.js). As an argument it accepts data object with the following properties:
   *
   * @default null
   */
  renderExternal?: (data: VirtualData) => any;
  /**
   * When enabled (by default) it will update Swiper layout right after renderExternal called. Useful to disable and update swiper manually when used with render libraries that renders asynchronously
   *
   * @default true
   */
  renderExternalUpdate?: boolean;
}