goog.provide('ol.interaction.MouseWheelZoom');

goog.require('goog.asserts');
goog.require('goog.events.MouseWheelEvent');
goog.require('goog.events.MouseWheelHandler.EventType');
goog.require('goog.math');
goog.require('ol');
goog.require('ol.Coordinate');
goog.require('ol.interaction.Interaction');



/**
 * @classdesc
 * Allows the user to zoom the map by scrolling the mouse wheel.
 *
 * @constructor
 * @extends {ol.interaction.Interaction}
 * @param {olx.interaction.MouseWheelZoomOptions=} opt_options Options.
 * @api stable
 */
ol.interaction.MouseWheelZoom = function(opt_options) {

  goog.base(this, {
    handleEvent: ol.interaction.MouseWheelZoom.handleEvent
  });

  var options = goog.isDef(opt_options) ? opt_options : {};

  /**
   * @private
   * @type {number}
   */
  this.delta_ = 0;

  /**
   * @private
   * @type {number}
   */
  this.duration_ = goog.isDef(options.duration) ? options.duration : 250;

  /**
   * @private
   * @type {?ol.Coordinate}
   */
  this.lastAnchor_ = null;

  /**
   * @private
   * @type {number|undefined}
   */
  this.startTime_ = undefined;

  /**
   * @private
   * @type {number|undefined}
   */
  this.timeoutId_ = undefined;

};
goog.inherits(ol.interaction.MouseWheelZoom, ol.interaction.Interaction);


/**
 * @param {ol.MapBrowserEvent} mapBrowserEvent Map browser event.
 * @return {boolean} `false` to stop event propagation.
 * @this {ol.interaction.MouseWheelZoom}
 * @api
 */
ol.interaction.MouseWheelZoom.handleEvent = function(mapBrowserEvent) {
  var stopEvent = false;
  if (mapBrowserEvent.type ==
      goog.events.MouseWheelHandler.EventType.MOUSEWHEEL) {
    var map = mapBrowserEvent.map;
    var mouseWheelEvent = mapBrowserEvent.browserEvent;
    goog.asserts.assertInstanceof(mouseWheelEvent, goog.events.MouseWheelEvent);

    this.lastAnchor_ = mapBrowserEvent.coordinate;
    this.delta_ += mouseWheelEvent.deltaY;

    if (!goog.isDef(this.startTime_)) {
      this.startTime_ = goog.now();
    }

    var duration = ol.MOUSEWHEELZOOM_TIMEOUT_DURATION;
    var timeLeft = Math.max(duration - (goog.now() - this.startTime_), 0);

    goog.global.clearTimeout(this.timeoutId_);
    this.timeoutId_ = goog.global.setTimeout(
        goog.bind(this.doZoom_, this, map), timeLeft);

    mapBrowserEvent.preventDefault();
    stopEvent = true;
  }
  return !stopEvent;
};


/**
 * @private
 * @param {ol.Map} map Map.
 */
ol.interaction.MouseWheelZoom.prototype.doZoom_ = function(map) {
  var maxDelta = ol.MOUSEWHEELZOOM_MAXDELTA;
  var delta = goog.math.clamp(this.delta_, -maxDelta, maxDelta);

  var view = map.getView();
  goog.asserts.assert(!goog.isNull(view));

  map.render();
  ol.interaction.Interaction.zoomByDelta(map, view, -delta, this.lastAnchor_,
      this.duration_);

  this.delta_ = 0;
  this.lastAnchor_ = null;
  this.startTime_ = undefined;
  this.timeoutId_ = undefined;
};