var EW = {
	isEmail: function(email) {
		let re = /^[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?$/i;
		return re.test(email);
	},
	isUrl: function(url) {
		let re =/^(\/?[\w-]+)(\/[\w-]+)*\/?|(((http|ftp|https):\/\/)?[\w-]+(\.[\w-]+)+([\w.,@?^=%&:\/~+#-]*[\w@?^=%&\/~+#-])?)$/i;
		return re.test(url);
	},	
	getUrlParameter: function(sParam) {
		var sPageURL = decodeURIComponent(window.location.search.substring(1)),
			sURLVariables = sPageURL.split('&'),
			sParameterName, i;
		for (i = 0; i < sURLVariables.length; i++) {
			sParameterName = sURLVariables[i].split('=');
			if (sParameterName[0] === sParam) {
				return sParameterName[1] === undefined ? !0 : sParameterName[1]
			}
		}
	},
	track: function(names) {
		let _saveOrigin = this.getUrlParameter('save_origin') || save_origin;
		try{_saveOrigin = JSON.parse(_saveOrigin)}catch(e){_saveOrigin = false;};

		names.forEach(n => {
			let param = this.getUrlParameter(n);

			if (param)
			{	
				if (this.storage.getItem(n) && _saveOrigin) {
					console.log(n, 'origin saved');
				}
				else {
					console.log(n, 'origin overwritten');
					this.setItem(n, param);
				}
			}				
		});
	},
	storage: (function() {
		var uid = new Date;
		var storage;
		var result;
		try {
			if (tracking_per_session) {
				(storage = window.sessionStorage).setItem(uid, uid);
				result = storage.getItem(uid) == uid;
				storage.removeItem(uid);
				return result && storage;
			}
			else {
				(storage = window.localStorage).setItem(uid, uid);
				result = storage.getItem(uid) == uid;
				storage.removeItem(uid);
				return result && storage;
			}

		} catch (exception) {}
	}()),
	removeItem: function(name) {
		if (this.storage)
			this.storage.removeItem(name);
	},
	setItem: function(name, value) {
		if (this.storage)
			this.storage.setItem(name, value);
	},
	getItem: function(name) {
		if (!this.storage)
			return null;

		let _saveOrigin = this.getUrlParameter('save_origin') || save_origin;
		try{_saveOrigin = JSON.parse(_saveOrigin)}catch(e){_saveOrigin = false;};

		let v = this.getUrlParameter(name);
		if (v) {			
			if (!this.storage.getItem(name) || !_saveOrigin) {
				this.setItem(name, v);
			}
		}

		return this.storage.getItem(name);
	},
	storePayload: function(payload) {
		Object.keys(payload).forEach(key => {
			if (!payload.hasOwnProperty(key))
				return;

			this.setItem(key, payload[key]);
		})
	},
	Roles: {
		Subscriber: 1,
		/*
		SomethingElse: 2,
		YetAnother: 4,
		SomethingEntirelyDifferent: 8
		*/
	},
	setRoles: function(roles) {
		if (this.storage)
			this.storage.setItem('roles', roles);
	},
	hasRole: function(role, callback, softEnforcement) {
		role = role || this.Roles.Subscriber;

		if (!this.storage && softEnforcement)
			return true;

		let roles;
		if (this.storage)
			roles = this.storage.getItem('roles');

		let bypass = this.getUrlParameter('utm_medium') === 'email';
		if (!bypass && (!roles || !(role & roles))){

			if (typeof(callback) == 'function')
				callback.apply(this);
			else if (this.isUrl(callback))
				window.location.href = callback;

			return false;
		}

		return true;
	},
	singleVisit: function(alternateUrl) {		

		let visited = false;
		if (this.storage)
			visited = this.storage.getItem(window.location.href);

		if (visited)
			window.location.href = alternateUrl;
		else
			this.setItem(window.location.href, 'true');
	},	
	transformUrl: function(sources, targets, url, defaultUrl) {
		
		url = url.replace(/&amp;/g, "&");
		defaultUrl = defaultUrl.replace(/&amp;/g, "&");

		let qs = '';
		let requirementsMet = true;

		if (sources.length !== targets.length) 
			requirementsMet = false;

		sources.forEach((s, i) => {
			if (!this.getItem(s.key) && s.required)
				requirementsMet = false;

			if (this.getItem(s.key)) {
				qs += targets[i] + '=' + this.getItem(s.key);
				if (i !== sources.length - 1)
					qs += '&';
			}			
		});

		if (!requirementsMet)
			return defaultUrl;

		if (url.indexOf('?')!=-1)
			url += '&' + qs;
		else
			url += '?' + qs;

		return url;
	}
}