var PetsDAO=(function(){
	var resourcePath="rest/pets/";
	var requestByAjax=function(data, done, fail, always) {
		done=typeof done!=='undefined' ? done : function() {};
		fail=typeof fail!=='undefined' ? fail : function() {};
		always=typeof always!=='undefined' ? always : function() {};

		let authToken=localStorage.getItem('authorization-token');
		if (authToken!==null) {
		    data.beforeSend=function(xhr){
			xhr.setRequestHeader('Authorization','Basic '+authToken);
		    };
		}

		$.ajax(data).done(done).fail(fail).always(always);
	    };
	    
	    function PetsDAO(){
	    	this.listPets=function(done,fail,always){
	    	    requestByAjax({
	    		url:resourcePath,
	    		type:'GET'
	    	    },done,fail,always);
	    	};
	    
		    this.addPet=function(pet,done,fail,always){
			    requestByAjax({
				url:resourcePath,
				type:'POST',
				data:pet
			    },done,fail,always);
			};
			
			this.modifyPet=function(pet,done,fail,always){
			    requestByAjax({
				url:resourcePath+pet.id,
				type:'PUT',
				data:pet
			    },done,fail,always);
			};
			
			this.deletePet=function(id,done,fail,always) {
			    requestByAjax({
				url:resourcePath+id,
				type:'DELETE',
			    },done,fail,always);
			};
	    }
	    
	    return PetsDAO;
})();