define(["helper/Test", "Tone/core/Buffer", "Tone/core/Tone"], function(Test, Buffer, Tone){

	var testFile = "./audio/sine.wav";

	describe("Buffer", function(){

		context("basic", function(){

			it("can be created and disposed", function(){
				var buff = new Buffer(testFile);
				buff.dispose();
				Test.wasDisposed(buff);
			});

			it("loads a file from a url string", function(done){
				var buffer = new Buffer(testFile, function(buff){
					expect(buff).to.be.instanceof(Buffer);
					buffer.dispose();
					done();
				});
			});

			it("has a duration", function(done){
				var buffer = new Buffer(testFile, function(){
					expect(buffer.duration).to.be.closeTo(3, 0.01);
					buffer.dispose();
					done();
				});
			});

			it("can be constructed with no arguments", function(){
				var buffer = new Buffer();
				expect(buffer.length).to.equal(0);
				expect(buffer.duration).to.equal(0);
				expect(buffer.numberOfChannels).to.equal(0);
				buffer.dispose();
			});

			it("can get the number of channels", function(done){
				var buffer = new Buffer(testFile, function(){
					expect(buffer.numberOfChannels).to.be.equal(1);
					buffer.dispose();
					done();
				});
			});

			it("can get the length of the buffer", function(done){
				var buffer = new Buffer(testFile, function(){
					expect(buffer.length).to.be.a.number;
					expect(buffer.length).to.be.above(130000);
					buffer.dispose();
					done();
				});
			});

			it("can be constructed with an options object", function(done){
				var buffer = new Buffer({
					"url" : testFile,
					"reverse" : true,
					"onload" : function(){
						buffer.dispose();
						done();
					}
				});
			});

			it("takes an AudioBuffer in the constructor method", function(done){
				var buffer = new Buffer({
					"url" : testFile,
					"onload" : function(){
						var testOne = new Buffer(buffer.get());
						expect(testOne.get()).to.equal(buffer.get());
						testOne.dispose();
						buffer.dispose();
						done();
					}
				});
			});

			it("takes a Tone.Buffer in the constructor method", function(done){
				var buffer = new Buffer({
					"url" : testFile,
					"onload" : function(){
						var testOne = new Buffer(buffer);
						expect(testOne.get()).to.equal(buffer.get());
						testOne.dispose();
						buffer.dispose();
						done();
					}
				});
			});

			it("takes an unloaded Tone.Buffer in the constructor method", function(done){
				var unloadedBuffer = new Buffer(testFile);
				var buffer = new Buffer({
					"url" : unloadedBuffer,
					"onload" : function(){
						var testOne = new Buffer(buffer);
						expect(unloadedBuffer.get()).to.equal(buffer.get());
						unloadedBuffer.dispose();
						buffer.dispose();
						done();
					}
				});
			});

			it("takes Tone.Buffer in the set method", function(done){
				var buffer = new Buffer({
					"url" : testFile,
					"onload" : function(){
						var testOne = new Buffer(testFile);
						testOne.set(buffer);
						expect(testOne.get()).to.equal(buffer.get());
						testOne.dispose();
						buffer.dispose();
						done();
					}
				});
			});

			it("takes AudioBuffer in the set method", function(done){
				var buffer = new Buffer({
					"url" : testFile,
					"onload" : function(){
						var testOne = new Buffer(testFile);
						testOne.set(buffer.get());
						expect(testOne.get()).to.equal(buffer.get());
						testOne.dispose();
						buffer.dispose();
						done();
					}
				});
			});
		});

		context("loading", function(){

			it("invokes the error callback if there is a problem with the file", function(done){
				var buffer = new Buffer("nosuchfile.wav", function(){
					throw new Error("shouldn't invoke this function");
				}, function(e){
					buffer.dispose();
					done();
				});
			});

			it("invokes the error callback on static .load method", function(done){
				Buffer.load("nosuchfile.wav", function(){
					Buffer.cancelDownloads();
					throw new Error("shouldn't invoke this function");
				}, function(){
					Buffer.cancelDownloads();
					done();
				});
			});

			it("can load a file with fallback extensions", function(done){
				Buffer.load("./audio/sine.[nope|nada|wav]", function(buffer){
					expect(buffer).to.exist;
					done();
				});
			});

			it("takes the first supported format when multiple extensions are provided", function(done){
				Buffer.load("./audio/sine.[wav|nope]", function(buffer){
					expect(buffer).to.exist;
					done();
				});
			});

			it("can pass in multiple extensions in Buffer instance", function(done){
				var buffer = new Buffer("./audio/sine.[nope|wav]", function(){
					buffer.dispose();
					done();
				});
			});

			it("instance .load method returns Promise", function(done){
				var promise = (new Buffer()).load(testFile);
				expect(promise).to.have.property("then");
				promise.then(function(buff){
					expect(buff).to.be.instanceOf(Buffer);
					done();
				});
				promise.catch(function(){
					throw new Error("shouldn't invoke this function");
				});
			});

			it("invokes the error callback if the file is corrupt", function(done){
				var buffer = new Buffer("./audio/corrupt.wav", function(){
					throw new Error("shouldn't invoke this function");
				}, function(e){
					buffer.dispose();
					done();
				});
			});
		});

		context("events", function(){

			it("the static on('error') method is invoked", function(done){
				Buffer.on("error", function(e){
					buffer.dispose();
					Buffer.cancelDownloads();
					Buffer.off("error");
					done();
				});
				var buffer = new Buffer("nosuchfile.wav");
			});

			it("the static on('load') method is invoked", function(done){
				var buffer = new Buffer(testFile);
				Buffer.on("load", function(){
					buffer.dispose();
					Buffer.off("load");
					done();
				});
			});

			it("the static on('progress') method is invoked", function(done){
				var buffer = new Buffer(testFile);
				Buffer.on("progress", function(percent){
					expect(percent).to.be.a.number;
					expect(percent).to.be.within(0, 1);
					if (percent === 1){
						Buffer.off("progress");
						buffer.dispose();
						done();
					}
				});
			});
		});

		context("buffer manipulation", function(){

			it("can get the channel data as an array", function(done){
				var buffer = new Buffer(testFile, function(){
					expect(buffer.getChannelData(0)).to.be.an.instanceOf(Float32Array);
					expect(buffer.getChannelData(0).length).to.be.above(130000);
					buffer.dispose();
					done();
				});
			});

			it("can reverse a buffer", function(done){
				var buffer = new Buffer(testFile, function(){
					var buffArray = buffer.get();
					var lastSample = buffArray[buffArray.length - 1];
					buffer.reverse = true;
					expect(buffer.get()[0]).to.equal(lastSample);
					buffer.dispose();
					done();
				});
			});

			it("can convert from an array", function(){
				var buffer = new Buffer();
				var arr = new Float32Array(0.5 * buffer.context.sampleRate);
				arr[0] = 0.5;
				buffer.fromArray(arr);
				expect(buffer.duration).to.equal(0.5);
				expect(buffer.numberOfChannels).to.equal(1);
				//test the first sample of the first channel to see if it's the same
				expect(buffer.toArray(0)[0]).to.equal(0.5);
				buffer.dispose();
			});

			it("can create a buffer from an array using the static method", function(){
				var arr = new Float32Array(0.5 * Tone.context.sampleRate);
				arr[0] = 0.5;
				var buffer = Buffer.fromArray(arr);
				expect(buffer.duration).to.equal(0.5);
				expect(buffer.numberOfChannels).to.equal(1);
				//test the first sample of the first channel to see if it's the same
				expect(buffer.toArray(0)[0]).to.equal(0.5);
				buffer.dispose();
			});

			it("can convert from a multidimentional array", function(){
				var buffer = new Buffer();
				var arr = [new Float32Array(0.5 * buffer.context.sampleRate), new Float32Array(0.5 * buffer.context.sampleRate)];
				arr[0][0] = 0.5;
				buffer.fromArray(arr);
				expect(buffer.duration).to.equal(0.5);
				expect(buffer.numberOfChannels).to.equal(2);
				expect(buffer.toArray(0)[0]).to.equal(0.5);
				buffer.dispose();
			});

			it("can convert to and from an array", function(){
				var buffer = new Buffer();
				var arr = [new Float32Array(0.5 * buffer.context.sampleRate), new Float32Array(0.5 * buffer.context.sampleRate)];
				arr[0][0] = 0.5;
				buffer.fromArray(arr);
				expect(buffer.toArray(0)[0]).to.equal(0.5);
				expect(buffer.toArray()[0][0]).to.equal(0.5);
				//with a selected channel
				expect(buffer.toArray(0)[0]).to.equal(0.5);
				buffer.dispose();
			});

			it("can slice a portion of the array", function(done){
				var buffer = new Buffer(testFile, function(){
					//original duration
					expect(buffer.duration).to.be.closeTo(3, 0.01);
					var sliced1 = buffer.slice(0, 1);
					//does not modify the original
					expect(buffer.duration).to.be.closeTo(3, 0.01);
					expect(sliced1.duration).to.be.closeTo(1, 0.01);
					var sliced2 = sliced1.slice(0.5);
					expect(sliced2.duration).to.be.closeTo(0.5, 0.01);

					buffer.dispose();
					sliced1.dispose();
					sliced2.dispose();
					done();
				});
			});
		});

		context("static methods", function(){

			it("Test if the browser supports the given type", function(){
				expect(Buffer.supportsType("test.wav")).to.be.true;
				expect(Buffer.supportsType("wav")).to.be.true;
				expect(Buffer.supportsType("path/to/test.wav")).to.be.true;
				expect(Buffer.supportsType("path/to/test.nope")).to.be.false;
			});

			it("can cancel the downloads", function(){
				var buff0 = new Buffer(testFile);
				var buff1 = new Buffer(testFile);
				Buffer.cancelDownloads();
				expect(Buffer._downloadQueue.length).to.equal(0);
			});

			it("can be constructed with Buffer.fromUrl", function(done){
				Buffer.fromUrl("nosuchfile.wav").then(function(){
					throw new Error("shouldn't invoke this function");
				}).catch(function(){
					done();
				});
			});
		});

	});

	describe("Tone.loaded()", function(){

		it("returns a promise", function(){
			expect(Tone.loaded()).to.have.property("then");
		});

		it("is invoked when all the buffers are loaded", function(){
			Buffer.cancelDownloads();
			var buff0 = new Buffer(testFile);
			var buff1 = new Buffer(testFile);
			return Tone.loaded();
		});

		it("invokes an error if one of the buffers is not found", function(done){
			Buffer.cancelDownloads();
			// expect(Tone.loaded)
			var buff0 = new Buffer(testFile);
			var buff1 = new Buffer("nosuchfile.wav");
			Tone.loaded().catch(function(e){
				expect(e).to.be.instanceOf(Error);
				done();
			});
		});
	});
});