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// Utils
import debounce from './utils/debounce';
import isFunction from './utils/isFunction';

// Methods
import update from './methods/update';
import destroy from './methods/destroy';
import enableEventListeners from './methods/enableEventListeners';
import disableEventListeners from './methods/disableEventListeners';
import Defaults from './methods/defaults';
import placements from './methods/placements';

export default class Popper {
  /**
   * Creates a new Popper.js instance.
   * @class Popper
   * @param {Element|referenceObject} reference - The reference element used to position the popper
   * @param {Element} popper - The HTML / XML element used as the popper
   * @param {Object} options - Your custom options to override the ones defined in [Defaults](#defaults)
   * @return {Object} instance - The generated Popper.js instance
   */
  constructor(reference, popper, options = {}) {
    // make update() debounced, so that it only runs at most once-per-tick
    this.update = debounce(this.update.bind(this));

    // with {} we create a new object with the options inside it
    this.options = { ...Popper.Defaults, ...options };

    // init state
    this.state = {
      isDestroyed: false,
      isCreated: false,
      scrollParents: [],
    };

    // get reference and popper elements (allow jQuery wrappers)
    this.reference = reference && reference.jquery ? reference[0] : reference;
    this.popper = popper && popper.jquery ? popper[0] : popper;

    // Deep merge modifiers options
    this.options.modifiers = {};
    Object.keys({
      ...Popper.Defaults.modifiers,
      ...options.modifiers,
    }).forEach(name => {
      this.options.modifiers[name] = {
        // If it's a built-in modifier, use it as base
        ...(Popper.Defaults.modifiers[name] || {}),
        // If there are custom options, override and merge with default ones
        ...(options.modifiers ? options.modifiers[name] : {}),
      };
    });

    // Refactoring modifiers' list (Object => Array)
    this.modifiers = Object.keys(this.options.modifiers)
      .map(name => ({
        name,
        ...this.options.modifiers[name],
      }))
      // sort the modifiers by order
      .sort((a, b) => a.order - b.order);

    // modifiers have the ability to execute arbitrary code when Popper.js get inited
    // such code is executed in the same order of its modifier
    // they could add new properties to their options configuration
    // BE AWARE: don't add options to `options.modifiers.name` but to `modifierOptions`!
    this.modifiers.forEach(modifierOptions => {
      if (modifierOptions.enabled && isFunction(modifierOptions.onLoad)) {
        modifierOptions.onLoad(
          this.reference,
          this.popper,
          this.options,
          modifierOptions,
          this.state
        );
      }
    });

    // fire the first update to position the popper in the right place
    this.update();

    const eventsEnabled = this.options.eventsEnabled;
    if (eventsEnabled) {
      // setup event listeners, they will take care of update the position in specific situations
      this.enableEventListeners();
    }

    this.state.eventsEnabled = eventsEnabled;
  }

  // We can't use class properties because they don't get listed in the
  // class prototype and break stuff like Sinon stubs
  update() {
    return update.call(this);
  }
  destroy() {
    return destroy.call(this);
  }
  enableEventListeners() {
    return enableEventListeners.call(this);
  }
  disableEventListeners() {
    return disableEventListeners.call(this);
  }

  /**
   * Schedules an update. It will run on the next UI update available.
   * @method scheduleUpdate
   * @memberof Popper
   */
  scheduleUpdate = () => requestAnimationFrame(this.update);

  /**
   * Collection of utilities useful when writing custom modifiers.
   * Starting from version 1.7, this method is available only if you
   * include `popper-utils.js` before `popper.js`.
   *
   * **DEPRECATION**: This way to access PopperUtils is deprecated
   * and will be removed in v2! Use the PopperUtils module directly instead.
   * Due to the high instability of the methods contained in Utils, we can't
   * guarantee them to follow semver. Use them at your own risk!
   * @static
   * @private
   * @type {Object}
   * @deprecated since version 1.8
   * @member Utils
   * @memberof Popper
   */
  static Utils = (typeof window !== 'undefined' ? window : global).PopperUtils;

  static placements = placements;

  static Defaults = Defaults;
}

/**
 * The `referenceObject` is an object that provides an interface compatible with Popper.js
 * and lets you use it as replacement of a real DOM node.<br />
 * You can use this method to position a popper relatively to a set of coordinates
 * in case you don't have a DOM node to use as reference.
 *
 * ```
 * new Popper(referenceObject, popperNode);
 * ```
 *
 * NB: This feature isn't supported in Internet Explorer 10.
 * @name referenceObject
 * @property {Function} data.getBoundingClientRect
 * A function that returns a set of coordinates compatible with the native `getBoundingClientRect` method.
 * @property {number} data.clientWidth
 * An ES6 getter that will return the width of the virtual reference element.
 * @property {number} data.clientHeight
 * An ES6 getter that will return the height of the virtual reference element.
 */