/**
 * @description Converts between JSON Objects and GlideRecords
 * @namespace 
 * @type {Class}
 */
var JSONtoGlide = Class.create();
JSONtoGlide.prototype = {
	/**
	 * @description Converts an object into a new GlideRecord
	 * @param  {Object} json A json object
	 * @return {GlideRecord}      A GlideRecord object
	 * @example
	 * var incident = { "_collection_type" : "incident", "short_description" : "Example"};
	 * var incidentRecord = new JSONtoGlide().marshall(incident);
	 */
	marshall: function(json) {
		if (!this.validateCollectionExists(json._collection_type)) {
			gs.log("INVALID COLLECTION : " + json._collection_type, "JSONtoGlide");
			return '';
		}
		var glideRecord = new GlideRecord(json._collection_type),
			item;
		if (!json.hasOwnProperty('sys_id')) {
			glideRecord.initialize();
		} else {
			glideRecord.get(json.sys_id);
		}
		for (item in json) {
			if (json.hasOwnProperty(item)) {
				glideRecord.setValue(item, json[item]);
			}
		}
		if (!json.hasOwnProperty('sys_id')) {
			glideRecord.insert();
		} else {
			glideRecord.update();
		}		
		return glideRecord;
	},
	/**
	 * @description Converts a GlideRecord into an object
	 * @param  {GlideRecord} record A GlideRecord
	 * @return {Object}        A json object
	 * @example
	 * var incident = new GlideRecord('incident'), 
	 *     object;
	 * if (incident.get('sys_id')) {
	 * 		object = new JSONtoGlide().unmarshall(incident);
	 * }
	 */
	unmarshall: function(record) {
		var fields = new GlideRecordUtil().getFields(record),
			resultObject = {},
			field;
		for (field in fields) {
			resultObject[fields[field]] = record.getValue(fields[field]);
		}
		return resultObject;
	},
	/**
	 * @description Ensures a table exists before trying to create a GlideRecord
	 * @param  {String} name The name of the table
	 * @return {boolean}      True if the table exists, false otherwise
	 * @example
	 * new JSONtoGlide().validateCollectionExists('incident'); //true
	 * new JSONtoGlide().validateCollectionExists('fake_table'); //false
	 */
	validateCollectionExists: function(name) {
		var table = new GlideRecord('sys_db_object');
		if (table.get('name', name)) {
			return true;
		}
		return false;
	},
	type: 'JSONtoGlide'
};