define(["helper/Basic", "Tone/event/Event", "Tone/core/Tone", "Tone/core/Transport", "helper/Offline", "Test"], 
	function (Basic, Event, Tone, Transport, Offline, Test) {

	describe("Event", function(){

		Basic(Event);

		context("Constructor", function(){

			it ("takes a callback and a value", function(){
				return Offline(function(){
					var callback = function(){};
					var note = new Event(callback, "C4");
					expect(note.callback).to.equal(callback);
					expect(note.value).to.equal("C4");
					note.dispose();
				});
			});

			it ("can be constructed with no arguments", function(){
				return Offline(function(){
					var note = new Event();
					expect(note.value).to.be.null;
					note.dispose();
				});
			});

			it ("can pass in arguments in options object", function(){
				return Offline(function(){
					var callback = function(){};
					var value = {"a" : 1};
					var note = new Event({
						"callback" : callback,
						"value" : value,
						"loop" : true,
						"loopEnd" : "4n",
						"probability" : 0.3
					});
					expect(note.callback).to.equal(callback);
					expect(note.value).to.equal(value);
					expect(note.loop).to.be.true;
					expect(note.loopEnd).to.equal("4n");
					expect(note.probability).to.equal(0.3);
					note.dispose();
				});
			});
		});

		context("Get/Set", function(){

			it ("can set values with object", function(){
				return Offline(function(){
					var callback = function(){};
					var note = new Event();
					note.set({
						"callback" : callback,
						"value" : "D4",
						"loop" : 8
					});
					expect(note.callback).to.equal(callback);
					expect(note.value).to.equal("D4");
					expect(note.loop).to.equal(8);
					note.dispose();
				});
			});

			it ("can set get a the values as an object", function(){
				return Offline(function(){
					var callback = function(){};
					var note = new Event({
						"callback" : callback,
						"value" : "D3",
						"loop" : 4
					});
					var values = note.get();
					expect(values.value).to.equal("D3");
					expect(values.loop).to.equal(4);
					note.dispose();
				});
			});
		});

		context("Event callback", function(){

			it ("does not invoke get invoked until started", function(){
				return Offline(function(Transport){
					new Event(function(){
						throw new Error("shouldn't call this callback");
					}, "C4");
					Transport.start();
				}, 0.3);
			});

			it ("is invoked after it's started", function(){
				var invoked = false;
				return Offline(function(Transport){
					var note = new Event(function(){
						note.dispose();
						invoked = true;
					}, "C4").start(0);
					Transport.start();
				}, 0.3).then(function(){
					expect(invoked).to.be.true;
				});
			});

			it ("passes in the scheduled time to the callback", function(){
				var invoked = false;
				return Offline(function(Transport){
					var now = 0.1;
					var note = new Event(function(time){
						expect(time).to.be.a.number;
						expect(time - now).to.be.closeTo(0.3, 0.01);
						note.dispose();
						invoked = true;
					});
					note.start(0.3);
					Transport.start(now);
				}, 0.5).then(function(){
					expect(invoked).to.be.true;
				});
			});

			it ("passes in the value to the callback", function(){
				var invoked = false;
				return Offline(function(Transport){
					var note = new Event(function(time, thing){
						expect(time).to.be.a.number;
						expect(thing).to.equal("thing");
						note.dispose();
						invoked = true;
					}, "thing").start();
					Transport.start();
				}, 0.3).then(function(){
					expect(invoked).to.be.true;
				});
			});

			it ("can mute the callback", function(){
				return Offline(function(Transport){
					var note = new Event(function(){
						throw new Error("shouldn't call this callback");
					}, "C4").start();
					note.mute = true;
					expect(note.mute).to.be.true;
					Transport.start();
				}, 0.3);
			});

			it ("can trigger with some probability", function(){

				return Offline(function(Transport){
					var note = new Event(function(){
						throw new Error("shouldn't call this callback");
					}, "C4").start();
					note.probability = 0;
					expect(note.probability).to.equal(0);
					Transport.start();
				}, 0.3);
			});
		});

		context("Scheduling", function(){

			it ("can be started and stopped multiple times", function(){
				return Offline(function(Transport){
					var note = new Event().start(0).stop(0.2).start(0.4);
					Transport.start(0);
					return function(time){
						Test.whenBetween(time, 0, 0.19, function(){
							expect(note.state).to.equal("started");
						});
						Test.whenBetween(time, 0.2, 0.39, function(){
							expect(note.state).to.equal("stopped");
						});
						Test.whenBetween(time, 0.4, Infinity, function(){
							expect(note.state).to.equal("started");
						});
					};
				}, 0.5);
			});

			it ("restarts when transport is restarted", function(){

				return Offline(function(Transport){
					var note = new Event().start(0).stop(0.4);
					Transport.start(0).stop(0.5).start(0.55);
					return function(sample, time){
						Test.whenBetween(time, 0, 0.39, function(){
							expect(note.state).to.equal("started");
						});
						Test.whenBetween(time, 0.4, 0.5, function(){
							expect(note.state).to.equal("stopped");	
						});
						Test.whenBetween(time, 0.55, 0.8, function(){
							expect(note.state).to.equal("started");
						});
					};
				}, 1);
			});


			it ("can be cancelled", function(){
				return Offline(function(Transport){
					var note = new Event().start(0);
					expect(note.state).to.equal("started");
					Transport.start();

					var firstStop = false;
					var restarted = false;
					var tested = false;
					return function(time){
						//stop the transport
						if (time > 0.2 && !firstStop){
							firstStop = true;
							Transport.stop();
							note.cancel();
						}
						if (time > 0.3 && !restarted){
							restarted = true;
							Transport.start();
						}
						if (time > 0.4 && !tested){
							restarted = true;
							Transport.start();
							expect(note.state).to.equal("stopped");
						}
					};
				}, 0.5);
			});

		});

		context("Looping", function(){

			it ("can be set to loop", function(){
				var callCount = 0;
				return Offline(function(Transport){
					new Event({
						"loopEnd" : 0.25,
						"loop" : true,
						"callback" : function(){
							callCount++;
						}
					}).start(0);
					Transport.start(0);
				}, 0.8).then(function(){
					expect(callCount).to.equal(4);
				});

			});

			it ("can be set to loop at a specific interval", function(){
				return Offline(function(Transport){
					var lastCall;
					new Event({
						"loopEnd" : 0.25,
						"loop" : true,
						"callback" : function(time){
							if (lastCall){
								expect(time - lastCall).to.be.closeTo(0.25, 0.01);
							}
							lastCall = time;
						}
					}).start(0);
					Transport.start();
				}, 1);
			});

			it ("can adjust the loop duration after starting", function(){
				return Offline(function(Transport){
					var lastCall;
					var note = new Event({
						"loopEnd" : 0.5,
						"loop" : true,
						"callback" : function(time){
							if (lastCall){
								expect(time - lastCall).to.be.closeTo(0.25, 0.01);
							} else {
								note.loopEnd = 0.25;
							}
							lastCall = time;
						}
					}).start(0);
					Transport.start();
				}, 0.8);
			});

			it ("can loop a specific number of times", function(){
				var callCount = 0;
				return Offline(function(Transport){
					new Event({
						"loopEnd" : 0.125,
						"loop" : 3,
						"callback" : function(){
							callCount++;
						}
					}).start(0);
					Transport.start();
				}, 0.8).then(function(){
					expect(callCount).to.equal(3);
				});
			});

			it ("can be started and stopped multiple times", function(){
				return Offline(function(Transport){
					var eventTimes = [0.3, 0.4, 0.9, 1.0, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9];
					var eventTimeIndex = 0;
					new Event({
						"loopEnd" : 0.1,
						"loop" : true,
						"callback" : function(time){
							expect(eventTimes.length).to.be.gt(eventTimeIndex);
							expect(eventTimes[eventTimeIndex]).to.be.closeTo(time, 0.05);
							eventTimeIndex++;
						}
					}).start(0.1).stop(0.2).start(0.5).stop(1.1);
					Transport.start(0.2).stop(0.5).start(0.8);
				}, 2);
			});

			it ("loops the correct amount of times when the event is started in the Transport's past", function(){
				var callCount = 0;
				return Offline(function(Transport){
					var note = new Event({
						"loopEnd" : 0.2,
						"loop" : 3,
						"callback" : function(){
							callCount++;
						}
					});
					Transport.start();
					var wasCalled = false;
					return function(time){
						if (time > 0.1 && !wasCalled) {
							wasCalled = true;
							note.start(0);
						}
					};
				}, 1).then(function(){
					expect(callCount).to.equal(2);
				});
			});

			it ("reports the progress of the loop", function(){
				return Offline(function(Transport){
					var note = new Event({
						"loopEnd" : 1,
						"loop" : true,
					}).start(0);
					Transport.start();
					return function(time){
						expect(note.progress).to.be.closeTo(time, 0.05);
					};
				}, 0.8);
			});

			it ("progress is 0 when not looping", function(){
				Offline(function(Transport){
					var note = new Event({
						"loopEnd" : 0.25,
						"loop" : false,
					}).start(0);
					Transport.start();
					return function(){
						expect(note.progress).to.equal(0);
					};
				}, 0.2);
			});
		});

		context("playbackRate and humanize", function(){


			it ("can adjust the playbackRate", function(){
				return Offline(function(Transport){
					var lastCall;
					new Event({
						"playbackRate" : 2,
						"loopEnd" : 0.5,
						"loop" : true,
						"callback" : function(time){
							if (lastCall){
								expect(time - lastCall).to.be.closeTo(0.25, 0.01);
							}
							lastCall = time;
						}
					}).start(0);
					Transport.start();
				}, 0.7);
			});

			it ("can adjust the playbackRate after starting", function(){
				return Offline(function(Transport){
					var lastCall;
					var note = new Event({
						"playbackRate" : 1,
						"loopEnd" : 0.25,
						"loop" : true,
						"callback" : function(time){
							if (lastCall){
								expect(time - lastCall).to.be.closeTo(0.5, 0.01);
							} else {
								note.playbackRate = 0.5;
							}
							lastCall = time;
						}
					}).start(0);
					Transport.start();
				}, 1.2);

			});

			it ("can humanize the callback by some amount", function(){
				return Offline(function(Transport){
					var lastCall;
					var note = new Event({
						"humanize" : 0.05,
						"loopEnd" : 0.25,
						"loop" : true,
						"callback" : function(time){
							if (lastCall){
								expect(time - lastCall).to.be.within(0.2, 0.3);
							} 
							lastCall += 0.25;
						}
					}).start(0);
					Transport.start();
				}, 0.6);
			});

		});

	});
});