define(["Tone/signal/Signal", "Tone/signal/Expr", "Test", "helper/Basic", 
	"helper/OutputAudio", "helper/PassAudio", "helper/Offline"], 
function(Signal, Expr, Test, Basic, OutputAudio, PassAudio, Offline){

	describe("Expr", function(){

		Basic(Expr, "1");

		context("I/O", function(){

			it("can create inputs", function(){
				var exp = new Expr("$0 + $1");
				Test.connect(exp, 0);
				Test.connect(exp, 1);
				exp.dispose();
			});

			it("has an output", function(){
				var exp = new Expr("0 + 0");
				exp.connect(Test);
				exp.dispose();
			});

			it("outputs audio", function(done){
				var exp;
				OutputAudio(function(out){
					exp = new Expr("1.1");
					exp.connect(out);
				}, function(){
					exp.dispose();
					done();
				});
			});

			it("passes input", function(done){
				var exp;
				PassAudio(function(input, output){
					exp = new Expr("$0");
					input.connect(exp);
					exp.connect(output);
				}, function(){
					exp.dispose();
					done();
				});
			});
		});

		context("Parsing", function(){

			it("can do string replacements", function(done){
				var exp;
				var offline = new Offline(); 
				offline.before(function(dest){
					exp = new Expr("% + %", 0.2, 0.8);
					exp.connect(dest);
				}); 
				offline.test(function(sample){
					expect(sample).to.be.closeTo(1, 0.001);
				}); 
				offline.after(function(){
					exp.dispose();
					done();
				});
				offline.run();
			});

			it("can do string replacements with strings", function(done){
				var exp;
				var offline = new Offline(); 
				offline.before(function(dest){
					exp = new Expr("%", "1 + 2");
					exp.connect(dest);
				}); 
				offline.test(function(sample){
					expect(sample).to.be.closeTo(3, 0.001);
				}); 
				offline.after(function(){
					exp.dispose();
					done();
				});
				offline.run();
			});

			it("handles precendence", function(done){
				var exp;
				var offline = new Offline(); 
				offline.before(function(dest){
					exp = new Expr("8 + 16 * 4 * (2 - 1)");
					exp.connect(dest);
				}); 
				offline.test(function(sample){
					expect(sample).to.be.closeTo(72, 0.01);
				}); 
				offline.after(function(){
					exp.dispose();
					done();
				});
				offline.run();
			});

			it("handles complex precendence", function(done){
				var exp;
				var offline = new Offline(); 
				offline.before(function(dest){
					exp = new Expr("2 * 2 + 1 > 0 == 0");
					exp.connect(dest);
				}); 
				offline.test(function(sample){
					expect(sample).to.equal(0);
				}); 
				offline.after(function(){
					exp.dispose();
					done();
				});
				offline.run();
			});

			it("tolerates inconsistent spacing", function(done){
				var exp;
				var offline = new Offline(); 
				offline.before(function(dest){
					exp = new Expr("2 *    3-2 *4 ");
					exp.connect(dest);
				}); 
				offline.test(function(sample){
					expect(sample).to.equal(-2);
				}); 
				offline.after(function(){
					exp.dispose();
					done();
				});
				offline.run();
			});

			it("handles parens", function(done){
				var exp;
				var offline = new Offline(); 
				offline.before(function(dest){
					exp = new Expr("(8 + 16) * (4 - 1)");
					exp.connect(dest);
				}); 
				offline.test(function(sample){
					expect(sample).to.equal(72);
				}); 
				offline.after(function(){
					exp.dispose();
					done();
				});
				offline.run();
			});
		});

		context("Math", function(){

			it("does signal addition", function(done){
				var exp;
				var offline = new Offline(); 
				offline.before(function(dest){
					exp = new Expr("1 + 3");
					exp.connect(dest);
				}); 
				offline.test(function(sample){
					expect(sample).to.equal(4);
				}); 
				offline.after(function(){
					exp.dispose();
					done();
				});
				offline.run();
			});

			it("does signal multiplication", function(done){
				var exp;
				var offline = new Offline(); 
				offline.before(function(dest){
					exp = new Expr("1.5 * 6");
					exp.connect(dest);
				}); 
				offline.test(function(sample){
					expect(sample).to.equal(9);
				}); 
				offline.after(function(){
					exp.dispose();
					done();
				});
				offline.run();
			});

			it("does signal subtraction", function(done){
				var exp;
				var offline = new Offline(); 
				offline.before(function(dest){
					exp = new Expr("8 - 16");
					exp.connect(dest);
				}); 
				offline.test(function(sample){
					expect(sample).to.equal(-8);
				}); 
				offline.after(function(){
					exp.dispose();
					done();
				});
				offline.run();
			});
		});
		
		context("Logic", function(){

			it("correctly outputs 1 for 1 && 1", function(done){
				var exp;
				var offline = new Offline(); 
				offline.before(function(dest){
					exp = new Expr("1 && 1");
					exp.connect(dest);
				}); 
				offline.test(function(sample){
					expect(sample).to.equal(1);
				}); 
				offline.after(function(){
					exp.dispose();
					done();
				});
				offline.run();
			});

			it("correctly outputs 0 for 0 && 1", function(done){
				var exp;
				var offline = new Offline(); 
				offline.before(function(dest){
					exp = new Expr("0 && 1");
					exp.connect(dest);
				}); 
				offline.test(function(sample){
					expect(sample).to.equal(0);
				}); 
				offline.after(function(){
					exp.dispose();
					done();
				});
				offline.run();
			});

			it("correctly outputs 0 for 0 || 0", function(done){
				var exp;
				var offline = new Offline(); 
				offline.before(function(dest){
					exp = new Expr("0||0");
					exp.connect(dest);
				}); 
				offline.test(function(sample){
					expect(sample).to.equal(0);
				}); 
				offline.after(function(){
					exp.dispose();
					done();
				});
				offline.run();
			});

			it("correctly outputs 1 for 0 || 1", function(done){
				var exp;
				var offline = new Offline(); 
				offline.before(function(dest){
					exp = new Expr("0 || 1");
					exp.connect(dest);
				}); 
				offline.test(function(sample){
					expect(sample).to.equal(1);
				}); 
				offline.after(function(){
					exp.dispose();
					done();
				});
				offline.run();
			});

			it("correctly outputs 1 for 1 || 0", function(done){
				var exp;
				var offline = new Offline(); 
				offline.before(function(dest){
					exp = new Expr("1 || 0");
					exp.connect(dest);
				}); 
				offline.test(function(sample){
					expect(sample).to.equal(1);
				}); 
				offline.after(function(){
					exp.dispose();
					done();
				});
				offline.run();
			});

			it("correctly outputs 1 for 1 > 0", function(done){
				var exp;
				var offline = new Offline(); 
				offline.before(function(dest){
					exp = new Expr("1 > 0");
					exp.connect(dest);
				}); 
				offline.test(function(sample){
					expect(sample).to.equal(1);
				}); 
				offline.after(function(){
					exp.dispose();
					done();
				});
				offline.run();
			});

			it("correctly outputs 1 for 100 > 99", function(done){
				var exp;
				var offline = new Offline(); 
				offline.before(function(dest){
					exp = new Expr("1 > 0");
					exp.connect(dest);
				}); 
				offline.test(function(sample){
					expect(sample).to.equal(1);
				}); 
				offline.after(function(){
					exp.dispose();
					done();
				});
				offline.run();
			});

			it("correctly outputs 0 for -10 > -9", function(done){
				var exp;
				var offline = new Offline(); 
				offline.before(function(dest){
					exp = new Expr("-10 > -9");
					exp.connect(dest);
				}); 
				offline.test(function(sample){
					expect(sample).to.equal(0);
				}); 
				offline.after(function(){
					exp.dispose();
					done();
				});
				offline.run();
			});

			it("correctly outputs 1 for 1.001 < 1.002", function(done){
				var exp;
				var offline = new Offline(); 
				offline.before(function(dest){
					exp = new Expr("1.001 < 1.002");
					exp.connect(dest);
				}); 
				offline.test(function(sample){
					expect(sample).to.equal(1);
				}); 
				offline.after(function(){
					exp.dispose();
					done();
				});
				offline.run();
			});

			it("correctly outputs 0 for 11 < 1.002", function(done){
				var exp;
				var offline = new Offline(); 
				offline.before(function(dest){
					exp = new Expr("11 < 1.002");
					exp.connect(dest);
				}); 
				offline.test(function(sample){
					expect(sample).to.equal(0);
				}); 
				offline.after(function(){
					exp.dispose();
					done();
				});
				offline.run();
			});

			it("correctly outputs 1 for 11.001 == 11.001", function(done){
				var exp;
				var offline = new Offline(); 
				offline.before(function(dest){
					exp = new Expr("11.001 == 11.001");
					exp.connect(dest);
				}); 
				offline.test(function(sample){
					expect(sample).to.equal(1);
				}); 
				offline.after(function(){
					exp.dispose();
					done();
				});
				offline.run();
			});

			it("correctly outputs 0 for 11.002 == 11.001", function(done){
				var exp;
				var offline = new Offline(); 
				offline.before(function(dest){
					exp = new Expr("11.002 == 11.001");
					exp.connect(dest);
				}); 
				offline.test(function(sample){
					expect(sample).to.equal(0);
				}); 
				offline.after(function(){
					exp.dispose();
					done();
				});
				offline.run();
			});
		});

		context("Unary Operators", function(){

			it("correctly outputs negative", function(done){
				var exp, sig;
				var offline = new Offline(); 
				offline.before(function(dest){
					sig = new Signal(1);
					exp = new Expr("-$0");
					sig.connect(exp);
					exp.connect(dest);
				}); 
				offline.test(function(sample){
					expect(sample).to.equal(-1);
				}); 
				offline.after(function(){
					exp.dispose();
					sig.dispose();
					done();
				});
				offline.run();
			});

			it("correctly handles NOT (!)", function(done){
				var exp;
				var offline = new Offline(); 
				offline.before(function(dest){
					exp = new Expr("!0");
					exp.connect(dest);
				}); 
				offline.test(function(sample){
					expect(sample).to.equal(1);
				}); 
				offline.after(function(){
					exp.dispose();
					done();
				});
				offline.run();
			});
		});

		context("Functions", function(){

			it("handles if(false)", function(done){
				var exp;
				var offline = new Offline(); 
				offline.before(function(dest){
					exp = new Expr("if(0, 2, 11)");
					exp.connect(dest);
				}); 
				offline.test(function(sample){
					expect(sample).to.equal(11);
				}); 
				offline.after(function(){
					exp.dispose();
					done();
				});
				offline.run();
			});

			it("handles if(true)", function(done){
				var exp;
				var offline = new Offline(); 
				offline.before(function(dest){
					exp = new Expr("if(1, 2, 11)");
					exp.connect(dest);
				}); 
				offline.test(function(sample){
					expect(sample).to.equal(2);
				}); 
				offline.after(function(){
					exp.dispose();
					done();
				});
				offline.run();
			});

			it("handles abs(-10)", function(done){
				var exp;
				var offline = new Offline(); 
				offline.before(function(dest){
					exp = new Expr("abs(-10)");
					exp.connect(dest);
				}); 
				offline.test(function(sample){
					expect(sample).to.equal(10);
				}); 
				offline.after(function(){
					exp.dispose();
					done();
				});
				offline.run();
			});

			it("handles abs(11)", function(done){
				var exp;
				var offline = new Offline(); 
				offline.before(function(dest){
					exp = new Expr("abs(11)");
					exp.connect(dest);
				}); 
				offline.test(function(sample){
					expect(sample).to.equal(11);
				}); 
				offline.after(function(){
					exp.dispose();
					done();
				});
				offline.run();
			});

			it("handles min(10, 11)", function(done){
				var exp;
				var offline = new Offline(); 
				offline.before(function(dest){
					exp = new Expr("min(10, 11)");
					exp.connect(dest);
				}); 
				offline.test(function(sample){
					expect(sample).to.equal(10);
				}); 
				offline.after(function(){
					exp.dispose();
					done();
				});
				offline.run();
			});

			it("handles min(7, -100)", function(done){
				var exp;
				var offline = new Offline(); 
				offline.before(function(dest){
					exp = new Expr("min(7, -100)");
					exp.connect(dest);
				}); 
				offline.test(function(sample){
					expect(sample).to.equal(-100);
				}); 
				offline.after(function(){
					exp.dispose();
					done();
				});
				offline.run();
			});

			it("handles max(10, 11)", function(done){
				var exp;
				var offline = new Offline(); 
				offline.before(function(dest){
					exp = new Expr("max(10, 11)");
					exp.connect(dest);
				}); 
				offline.test(function(sample){
					expect(sample).to.equal(11);
				}); 
				offline.after(function(){
					exp.dispose();
					done();
				});
				offline.run();
			});

			it("handles max(7, -100)", function(done){
				var exp;
				var offline = new Offline(); 
				offline.before(function(dest){
					exp = new Expr("max(7, -100)");
					exp.connect(dest);
				}); 
				offline.test(function(sample){
					expect(sample).to.equal(7);
				}); 
				offline.after(function(){
					exp.dispose();
					done();
				});
				offline.run();
			});

			it("handles mod(0.1, 0.9)", function(done){
				var exp;
				var offline = new Offline(); 
				offline.before(function(dest){
					exp = new Expr("mod(0.1, 0.9)");
					exp.connect(dest);
				}); 
				offline.test(function(sample){
					expect(sample).to.be.closeTo(0.1, 0.0001);
				}); 
				offline.after(function(){
					exp.dispose();
					done();
				});
				offline.run();
			});

			it("handles mod(0.5, 0.25)", function(done){
				var exp;
				var offline = new Offline(); 
				offline.before(function(dest){
					exp = new Expr("mod(0.6, 0.25)");
					exp.connect(dest);
				}); 
				offline.test(function(sample){
					expect(sample).to.be.closeTo(0.1, 0.0001);
				}); 
				offline.after(function(){
					exp.dispose();
					done();
				});
				offline.run();
			});

			it("outputs 1 for gt0(9)", function(done){
				var exp;
				var offline = new Offline(); 
				offline.before(function(dest){
					exp = new Expr("gt0(9)");
					exp.connect(dest);
				}); 
				offline.test(function(sample){
					expect(sample).to.equal(1);
				}); 
				offline.after(function(){
					exp.dispose();
					done();
				});
				offline.run();
			});

			it("outputs 0 for gt0(-9)", function(done){
				var exp;
				var offline = new Offline(); 
				offline.before(function(dest){
					exp = new Expr("gt0(-9)");
					exp.connect(dest);
				}); 
				offline.test(function(sample){
					expect(sample).to.equal(0);
				}); 
				offline.after(function(){
					exp.dispose();
					done();
				});
				offline.run();
			});

			it("outputs 1 for eq0(0)", function(done){
				var exp;
				var offline = new Offline(); offline.before(function(dest){
					exp = new Expr("eq0(0)");
					exp.connect(dest);
				}); 
				offline.test(function(sample){
					expect(sample).to.equal(1);
				}); 
				offline.after(function(){
					exp.dispose();
					done();
				});
				offline.run();
			});

			it("outputs 0 for eq0(-10)", function(done){
				var exp;
				var offline = new Offline(); offline.before(function(dest){
					exp = new Expr("eq0(-10)");
					exp.connect(dest);
				}); 
				offline.test(function(sample){
					expect(sample).to.equal(0);
				}); 
				offline.after(function(){
					exp.dispose();
					done();
				});
				offline.run();
			});

			it("computes pow(0.2, 3)", function(done){
				var exp;
				var offline = new Offline(); offline.before(function(dest){
					exp = new Expr("pow(0.2, 3)");
					exp.connect(dest);
				}); 
				offline.test(function(sample){
					expect(sample).to.be.closeTo(0.008, 0.001);
				}); 
				offline.after(function(){
					exp.dispose();
					done();
				});
				offline.run();
			});
		});

		context("Nested Operators", function(){

			it("correctly outputs 1 in if(2 * 4 > 8, max(1, 2), min(1, 2))", function(done){
				var exp;
				var offline = new Offline(); offline.before(function(dest){
					exp = new Expr("if(2 * 4 > 8, max(1, 2), min(1, 2))");
					exp.connect(dest);
				}); 
				offline.test(function(sample){
					expect(sample).to.equal(1);
				}); 
				offline.after(function(){
					exp.dispose();
					done();
				});
				offline.run();
			});

			it("correctly outputs 1 in if(2 * 4 > 8, max(1, 2), min(1, 2))", function(done){
				var exp;
				var offline = new Offline(); offline.before(function(dest){
					exp = new Expr("if(2 * 4 > 8, max(1, 2), min(1, 2))");
					exp.connect(dest);
				}); 
				offline.test(function(sample){
					expect(sample).to.equal(1);
				}); 
				offline.after(function(){
					exp.dispose();
					done();
				});
				offline.run();
			});

			it("correctly outputs 29 for abs(if(0 < -2, -10, -29))", function(done){
				var exp;
				var offline = new Offline(); offline.before(function(dest){
					exp = new Expr("abs(if(0 < -2, -10, -29))");
					exp.connect(dest);
				}); 
				offline.test(function(sample){
					expect(sample).to.equal(29);
				}); 
				offline.after(function(){
					exp.dispose();
					done();
				});
				offline.run();
			});

		});

		context("Signal Inputs", function(){

			it("correctly outputs 1 in if($0 * $1 > 8, $1, $0) with inputs 1 and 7", function(done){
				var exp, sig0, sig1;
				var offline = new Offline(); offline.before(function(dest){
					sig0 = new Signal(1);
					sig1 = new Signal(7);
					exp = new Expr("if($0 * $1 > 8, $1, $0)");
					sig0.connect(exp, 0, 0);
					sig1.connect(exp, 0, 1);
					exp.connect(dest);
				}); 
				offline.test(function(sample){
					expect(sample).to.equal(1);
				}); 
				offline.after(function(){
					sig0.dispose();
					sig1.dispose();
					exp.dispose();
					done();
				});
				offline.run();
			});

			it("correctly outputs 3 in max($0 * $1, $0 + $1) with inputs 1 and 2", function(done){
				var exp, sig0, sig1;
				var offline = new Offline(); offline.before(function(dest){
					sig0 = new Signal(1);
					sig1 = new Signal(2);
					exp = new Expr("max($0 * $1, $0 + $1)");
					sig0.connect(exp, 0, 0);
					sig1.connect(exp, 0, 1);
					exp.connect(dest);
				}); 
				offline.test(function(sample){
					expect(sample).to.equal(3);
				}); 
				offline.after(function(){
					sig0.dispose();
					sig1.dispose();
					exp.dispose();
					done();
				});
				offline.run();
			});
		});
	});

});