import { Compare, Plot } from "@tonejs/plot";
import { expect } from "chai";
import { BasicTests, testAudioContext } from "test/helper/Basic";
import { Offline } from "test/helper/Offline";
import { SCHEDULE_RAMP_AFTER_SET_TARGET } from "test/helper/Supports";
import { getContext } from "../Global";
import { Param } from "./Param";

const audioContext = getContext();

describe("Param", () => {

	BasicTests(Param, {
		param: testAudioContext.createOscillator().frequency,
	});

	context("constructor", () => {
		it("can be created and disposed", async () => {
			await Offline(context => {
				const param = new Param<Time>({
					context,
					param: context.createConstantSource().offset,
					units: "time",
				});
				expect(param.getValueAtTime(0)).to.equal(1);
				param.dispose();
			});
		});

		it("can pass in a value", async () => {
			await Offline(context => {
				const param = new Param({
					context,
					param: context.createConstantSource().offset,
					value : 1.1,
				});
				expect(param.getValueAtTime(0)).to.equal(1.1);
				param.dispose();
			});
		});

		it ("requires a param in the constructor", () => {
			expect(() => {
				const param = new Param({
					value: 1.1,
				});
			}).throws(Error);
		});
	});

	context("Scheduling Curves", () => {

		const sampleRate = 11025;
		function matchesOutputCurve(param, outBuffer): void {
			outBuffer.toArray()[0].forEach((sample, index) => {
				try {
					expect(param.getValueAtTime(index / sampleRate)).to.be.closeTo(sample, 0.1);
				} catch (e) {
					throw e;
				}
			});
		}

		if (SCHEDULE_RAMP_AFTER_SET_TARGET) {

			it("correctly handles setTargetAtTime followed by a ramp", async () => {
				let param;
				// this fails on FF
				const testBuffer = await Offline(context => {
					const source = context.createConstantSource();
					source.connect(context.rawContext.destination);
					source.start(0);
					param = new Param({
						context,
						param: source.offset,
					});
					param.setTargetAtTime(2, 0.5, 0.1);
					expect(param.getValueAtTime(0.6)).to.be.closeTo(1.6, 0.1);
					param.linearRampToValueAtTime(0.5, 0.7);
					expect(param.getValueAtTime(0.6)).to.be.closeTo(0.75, 0.1);
				}, 1.5, 1, sampleRate);
				document.body.appendChild(await Plot.signal(testBuffer));
				matchesOutputCurve(param, testBuffer);
			});

			it("schedules a value curve", async () => {
				let param;
				const testBuffer = await Offline(context => {
					const source = context.createConstantSource();
					source.connect(context.rawContext.destination);
					source.start(0);
					param = new Param({
						context,
						param: source.offset,
						units: "number",
						value : 0,
					});
					param.setValueCurveAtTime([0, 0.5, 0, 1, 1.5], 0.1, 0.8, 0.5);
					expect(param.getValueAtTime(0.91)).to.be.closeTo(0.75, 0.01);
				}, 1, 1, sampleRate);
				document.body.appendChild(await Plot.signal(testBuffer));
				matchesOutputCurve(param, testBuffer);
			});

			it ("a mixture of scheduling curves", async () => {
				let param;
				const testBuffer = await Offline(context => {
					const source = context.createConstantSource();
					source.connect(context.rawContext.destination);
					source.start(0);
					param = new Param({
						context,
						param: source.offset,
						value : 0.1,
					});
					param.setValueAtTime(0, 0);
					param.setValueAtTime(1, 0.1);
					param.linearRampToValueAtTime(3, 0.2);
					param.exponentialRampToValueAtTime(0.01, 0.3);
					param.setTargetAtTime(-1, 0.35, 0.2);
					param.cancelAndHoldAtTime(0.6);
					param.rampTo(1.1, 0.2, 0.7);
					param.exponentialRampTo(0, 0.1, 0.85);
					param.setValueAtTime(0, 1);
					param.linearRampTo(1, 0.2, 1);
					param.targetRampTo(0, 0.1, 1.1);
					param.setValueAtTime(4, 1.2);
					param.cancelScheduledValues(1.2);
					param.linearRampToValueAtTime(1, 1.3);
				}, 1.5, 1, sampleRate);
				document.body.appendChild(await Plot.signal(testBuffer));
				matchesOutputCurve(param, testBuffer);
			});

			it("can cancel and hold", async () => {
				let param;
				const testBuffer = await Offline(context => {
					const source = context.createConstantSource();
					source.connect(context.rawContext.destination);
					source.start(0);
					param = new Param({
						context,
						param: source.offset,
						value: 0.1,
					});
					param.setValueAtTime(0, 0);
					param.setValueAtTime(1, 0.2);
					param.cancelAndHoldAtTime(0.1);
					param.linearRampToValueAtTime(1, 0.3);
					param.cancelAndHoldAtTime(0.2);
					expect(param.getValueAtTime(0.2)).to.be.closeTo(0.5, 0.001);
					param.exponentialRampToValueAtTime(0, 0.4);
					param.cancelAndHoldAtTime(0.25);
					expect(param.getValueAtTime(0.25)).to.be.closeTo(0.033, 0.001);
					param.setTargetAtTime(1, 0.3, 0.1);
					param.cancelAndHoldAtTime(0.4);
					expect(param.getValueAtTime(0.4)).to.be.closeTo(0.644, 0.001);
					param.setValueAtTime(0, 0.45);
					param.setValueAtTime(1, 0.48);
					param.cancelAndHoldAtTime(0.45);
					expect(param.getValueAtTime(0.45)).to.be.closeTo(0, 0.001);
				}, 0.5, 1, sampleRate);
				matchesOutputCurve(param, testBuffer);
				// document.body.appendChild(await Plot.signal(testBuffer));
			});

		// 	it ("matches known values", async () => {
		// 		await Compare.toFile(context => {
		// 			const source = context.createConstantSource();
		// 			source.connect(context.rawContext.destination);
		// 			source.start(0);
		// 			const param = new Param({
		// 				context,
		// 				param: source.offset,
		// 				value: 0.1,
		// 			});
		// 			param.setValueAtTime(0, 0);
		// 			param.setValueAtTime(1, 0.2);
		// 			param.cancelAndHoldAtTime(0.1);
		// 			param.linearRampToValueAtTime(1, 0.3);
		// 			param.cancelAndHoldAtTime(0.2);
		// 			param.exponentialRampToValueAtTime(0, 0.4);
		// 			param.cancelAndHoldAtTime(0.25);
		// 			param.setTargetAtTime(1, 0.3, 0.1);
		// 			param.cancelAndHoldAtTime(0.4);
		// 		}, "/base/test/audio/param/curve_0.wav", 0.01, 0.5, 1, 11025);
		// 	});
		}

	});

	context("Units", () => {

		it("can be created with specific units", () => {
			const gain = audioContext.createGain();
			const param = new Param<BPM>({
				context: audioContext,
				param : gain.gain,
				units : "bpm",
			});
			expect(param.units).to.equal("bpm");
			param.dispose();
		});

		it("can evaluate the given units", () => {
			const gain = audioContext.createGain();
			const param = new Param<Decibels>({
				context: audioContext,
				param: gain.gain,
				units: "decibels",
			});
			param.value = 0.5;
			expect(param.value).to.be.closeTo(0.5, 0.001);
			param.dispose();
		});

		it("can be forced to not convert", async () => {
			const testBuffer = await Offline(context => {
				const source = context.createConstantSource();
				source.connect(context.rawContext.destination);
				source.start(0);
				const param = new Param({
					context,
					convert : false,
					param: source.offset,
					units : "decibels",
				});
				param.value = -10;
				expect(param.value).to.be.closeTo(-10, 0.01);
			}, 0.001, 1);
			expect(testBuffer.getValueAtTime(0)).to.be.closeTo(-10, 0.01);
		});

	});

	context("Unit Conversions", () => {
		function testUnitConversion(units: UnitName, inputValue: any, inputVerification: number, outputValue: number): void {
			it(`converts to ${units}`, async () => {
				const testBuffer = await Offline(context => {
					const source = context.createConstantSource();
					source.connect(context.rawContext.destination);
					source.start(0);
					const param = new Param({
						context,
						param: source.offset,
						units,
					});
					param.value = inputValue;
					expect(param.value).to.be.closeTo(inputVerification, 0.01);
				}, 0.001, 1);
				expect(testBuffer.getValueAtTime(0)).to.be.closeTo(outputValue, 0.01);
			});
		}

		testUnitConversion("number", 3, 3, 3);
		testUnitConversion("decibels", -10, -10, 0.31);
		testUnitConversion("decibels", -20, -20, 0.1);
		testUnitConversion("decibels", -100, -100, 0);
		testUnitConversion("gain", 1.2, 1.2, 1.2);
		testUnitConversion("positive", 1.5, 1.5, 1.5);
		testUnitConversion("positive", -1.5, 0, 0);
		testUnitConversion("time", 2, 2, 2);
		testUnitConversion("time", 0, 0, 0);
		testUnitConversion("frequency", 20, 20, 20);
		testUnitConversion("frequency", 0.1, 0.1, 0.1);
		testUnitConversion("normalRange", -1, 0, 0);
		testUnitConversion("normalRange", 0.5, 0.5, 0.5);
		testUnitConversion("normalRange", 1.5, 1, 1);
		testUnitConversion("audioRange", -1.1, -1, -1);
		testUnitConversion("audioRange", 0.5, 0.5, 0.5);
		testUnitConversion("audioRange", 1.5, 1, 1);
	});

	context("min/maxValue", () => {
		function testMinMaxValue(units: UnitName, min, max): void {
			it(`has proper min/max for ${units}`, () => {
				const source = audioContext.createConstantSource();
				source.connect(audioContext.rawContext.destination);
				const param = new Param({
					context : audioContext,
					param: source.offset,
					units,
				});
				expect(param.minValue).to.be.equal(min);
				expect(param.maxValue).to.be.equal(max);
			});
		}
		// number, decibels, normalRange, audioRange, gain
		// positive, time, frequency, transportTime, ticks, bpm, degrees, samples, hertz
		const rangeMax = 3.4028234663852886e+38;
		testMinMaxValue("number", -rangeMax, rangeMax);
		testMinMaxValue("decibels", -Infinity, rangeMax);
		testMinMaxValue("normalRange", 0, 1);
		testMinMaxValue("audioRange", -1, 1);
		testMinMaxValue("gain", -rangeMax, rangeMax);
		testMinMaxValue("positive", 0, rangeMax);
		testMinMaxValue("time", 0, rangeMax);
		testMinMaxValue("frequency", 0, rangeMax);
		testMinMaxValue("transportTime", 0, rangeMax);
		testMinMaxValue("ticks", 0, rangeMax);
		testMinMaxValue("bpm", 0, rangeMax);
		testMinMaxValue("degrees", -rangeMax, rangeMax);
		testMinMaxValue("samples", 0, rangeMax);
		testMinMaxValue("hertz", 0, rangeMax);
	});

	// const allSchedulingMethods = ['setValueAtTime', 'linearRampToValueAtTime', 'exponentialRampToValueAtTime']

	context("setValueAtTime", () => {
		function testSetValueAtTime(units: UnitName, value0, value1, value2): void {
			it(`can schedule value with units ${units}`, async () => {
				const testBuffer = await Offline(context => {
					const source = context.createConstantSource();
					source.connect(context.rawContext.destination);
					source.start(0);
					const param = new Param({
						context,
						param: source.offset,
						units,
					});
					param.setValueAtTime(value0, 0);
					param.setValueAtTime(value1, 0.01);
					param.setValueAtTime(value2, 0.02);

					expect(param.getValueAtTime(0)).to.be.closeTo(value0, 0.01);
					expect(param.getValueAtTime(0.01)).to.be.closeTo(value1, 0.01);
					expect(param.getValueAtTime(0.02)).to.be.closeTo(value2, 0.01);
				}, 0.022, 1);
				expect(testBuffer.getValueAtTime(0)).to.be.closeTo(0, 0.01);
				expect(testBuffer.getValueAtTime(0.011)).to.be.closeTo(1, 0.01);
				expect(testBuffer.getValueAtTime(0.021)).to.be.closeTo(0.5, 0.01);
			});

		}

		const allUnits: UnitName[] = ["number", "decibels", "normalRange", "audioRange", "gain",
		"positive", "time", "frequency", "transportTime", "ticks", "bpm", "degrees", "samples", "hertz"];

		allUnits.forEach(unit => {
			if (unit === "decibels") {
				testSetValueAtTime(unit, -100, 0, -6);
			} else {
				testSetValueAtTime(unit, 0, 1, 0.5);
			}
		});
	});

	["linearRampToValueAtTime", "exponentialRampToValueAtTime"].forEach(method => {

		context(method, () => {
			function testRampToValueAtTime(units: UnitName, value0, value1, value2): void {
				it(`can schedule value with units ${units}`, async () => {
					const testBuffer = await Offline(context => {
						const source = context.createConstantSource();
						source.connect(context.rawContext.destination);
						source.start(0);
						const param = new Param({
							context,
							param: source.offset,
							units,
						});
						param.setValueAtTime(value0, 0);
						param[method](value1, 0.01);
						param[method](value2, 0.02);

						expect(param.getValueAtTime(0)).to.be.closeTo(value0, 0.01);
						expect(param.getValueAtTime(0.01)).to.be.closeTo(value1, 0.01);
						expect(param.getValueAtTime(0.02)).to.be.closeTo(value2, 0.01);
					}, 0.022, 1);
					expect(testBuffer.getValueAtTime(0)).to.be.closeTo(1, 0.01);
					expect(testBuffer.getValueAtTime(0.01)).to.be.closeTo(0.7, 0.01);
					expect(testBuffer.getValueAtTime(0.02)).to.be.closeTo(0, 0.01);
				});

			}

			const allUnits: UnitName[] = ["number", "decibels", "normalRange", "audioRange", "gain",
				"positive", "time", "frequency", "transportTime", "ticks", "bpm", "degrees", "samples", "hertz"];

			allUnits.forEach(unit => {
				if (unit === "decibels") {
					testRampToValueAtTime(unit, 0, -3, -100);
				} else {
					testRampToValueAtTime(unit, 1, 0.7, 0);
				}
			});
		});
	});

	["linearRampTo", "exponentialRampTo", "rampTo", "targetRampTo"].forEach(method => {

		context(method, () => {
			function testRampToValueAtTime(units: UnitName, value0, value1, value2): void {
				it(`can schedule value with units ${units}`, async () => {
					const testBuffer = await Offline(context => {
						const source = context.createConstantSource();
						source.connect(context.rawContext.destination);
						source.start(0);
						const param = new Param({
							context,
							param: source.offset,
							units,
							value: value0,
						});
						param[method](value1, 0.009, 0);
						param[method](value2, 0.01, 0.01);

						expect(param.getValueAtTime(0)).to.be.closeTo(value0, 0.02);
						expect(param.getValueAtTime(0.01)).to.be.closeTo(value1, 0.02);
						if (units !== "decibels") {
							expect(param.getValueAtTime(0.025)).to.be.closeTo(value2, 0.01);
						}
					}, 0.021, 1);
					// document.body.appendChild(await Plot.signal(testBuffer));
					expect(testBuffer.getValueAtTime(0)).to.be.closeTo(1, 0.01);
					expect(testBuffer.getValueAtTime(0.01)).to.be.closeTo(0.7, 0.01);
					expect(testBuffer.getValueAtTime(0.02)).to.be.closeTo(0, 0.01);
				});

			}

			const allUnits: UnitName[] = ["number", "decibels", "normalRange", "audioRange", "gain",
				"positive", "time", "frequency", "transportTime", "ticks", "bpm", "degrees", "samples", "hertz"];

			allUnits.forEach(unit => {
				if (unit === "decibels") {
					testRampToValueAtTime(unit, 0, -3, -100);
				} else {
					testRampToValueAtTime(unit, 1, 0.7, 0);
				}
			});
		});
	});
});