goog.provide('ol.source.MapQuest');

goog.require('goog.asserts');
goog.require('ol.Attribution');
goog.require('ol.source.OSM');
goog.require('ol.source.XYZ');


/**
 * @classdesc
 * Layer source for the MapQuest tile server.
 *
 * @constructor
 * @extends {ol.source.XYZ}
 * @param {olx.source.MapQuestOptions=} opt_options MapQuest options.
 * @api stable
 */
ol.source.MapQuest = function(opt_options) {

  var options = opt_options || {};
  goog.asserts.assert(options.layer in ol.source.MapQuestConfig,
      'known layer configured');

  var layerConfig = ol.source.MapQuestConfig[options.layer];

  /**
   * Layer. Possible values are `osm`, `sat`, and `hyb`.
   * @type {string}
   * @private
   */
  this.layer_ = options.layer;

  var url = options.url !== undefined ? options.url :
      'https://otile{1-4}-s.mqcdn.com/tiles/1.0.0/' +
      this.layer_ + '/{z}/{x}/{y}.jpg';

  goog.base(this, {
    attributions: layerConfig.attributions,
    cacheSize: options.cacheSize,
    crossOrigin: 'anonymous',
    logo: 'https://developer.mapquest.com/content/osm/mq_logo.png',
    maxZoom: layerConfig.maxZoom,
    reprojectionErrorThreshold: options.reprojectionErrorThreshold,
    opaque: layerConfig.opaque,
    tileLoadFunction: options.tileLoadFunction,
    url: url
  });

};
goog.inherits(ol.source.MapQuest, ol.source.XYZ);


/**
 * @const
 * @type {ol.Attribution}
 */
ol.source.MapQuest.TILE_ATTRIBUTION = new ol.Attribution({
  html: 'Tiles Courtesy of <a href="http://www.mapquest.com/">MapQuest</a>'
});


/**
 * @type {Object.<string, {maxZoom: number, opaque: boolean, attributions: (Array.<ol.Attribution>)}>}
 */
ol.source.MapQuestConfig = {
  'osm': {
    maxZoom: 19,
    opaque: true,
    attributions: [
      ol.source.MapQuest.TILE_ATTRIBUTION,
      ol.source.OSM.ATTRIBUTION
    ]
  },
  'sat': {
    maxZoom: 18,
    opaque: true,
    attributions: [
      ol.source.MapQuest.TILE_ATTRIBUTION,
      new ol.Attribution({
        html: 'Portions Courtesy NASA/JPL-Caltech and ' +
            'U.S. Depart. of Agriculture, Farm Service Agency'
      })
    ]
  },
  'hyb': {
    maxZoom: 18,
    opaque: false,
    attributions: [
      ol.source.MapQuest.TILE_ATTRIBUTION,
      ol.source.OSM.ATTRIBUTION
    ]
  }
};


/**
 * Get the layer of the source, either `osm`, `sat`, or `hyb`.
 * @return {string} Layer.
 * @api
 */
ol.source.MapQuest.prototype.getLayer = function() {
  return this.layer_;
};