var nyc = nyc || {};

/**
 * @desc An abstract class for creating and manipulating the NYC basemap 
 * @public
 * @abstract
 * @class
 * @constructor
 */
nyc.Basemap = function(){};

nyc.Basemap.prototype = {
	/** 
	 * @desc Show photo layer
	 * @public
	 * @abstract
	 * @method	
	 * @param layer {number} The photo year to show
	 */
	showPhoto: function(year){
		throw 'Not Implemented';
	},
	/** 
	 * @desc Show the specified label layer
	 * @public
	 * @abstract
	 * @method	
	 * @param labelType {nyc.Basemap.LabelType} The label type to show
	 */
	showLabels: function(labelType){
		throw 'Not Implemented';
	},
	/** 
	 * @desc Hide photo layer
	 * @public
	 * @abstract
	 * @method	
	 */
	hidePhoto: function(){
		throw 'Not Implemented';
	},
	/** 
	 * @desc Returns the base layers
	 * @public
	 * @abstract
	 * @method
	 * @return {nyc.Basemap.BaseLayers}
	 */
	getBaseLayers: function(){
		throw 'Not Implemented';
	},
	/** 
	 * @desc Returns the base layers
	 * @public
	 * @method
	 * @return {nyc.Basemap.BaseLayers}
	 */
	sortedPhotos: function(){
		var sorted = [];
		for (var photo in this.photos){
			sorted.push(this.photos[photo]);
		}
		/* sort descending on the first 4 digits - puts 2001-2 in the proper place */
		return sorted.sort(function(a, b){
			var aName = a.name || a.get('name'), bName = b.name || b.get('name');
			return bName.substr(0, 4) - aName.substr(0, 4);
		});
	}
};


/** 
 * @desc Enumerator for label types
 * @public
 * @enum {string}
 */
nyc.Basemap.LabelType = {
	/**
	 * @desc Label type for base layer
	 */
	BASE: 'base',
	/**
	 * @desc Label type for photo layer
	 */
	PHOTO: 'photo'
};

/**
 * @desc Object type to hold base layers
 * @public
 * @typedef {Object}
 * @property {Object} base The base layer
 * @property {Object<string, ol.layer.Base|L.Layer>} labels The label layers 
 * @property {Object<string, ol.layer.Base|L.Layer>} photos The photo layers 
 */
nyc.Basemap.BaseLayers;