import Tone from "../core/Tone";
import "../signal/GreaterThanZero";
import "../signal/Subtract";
import "../signal/Signal";

/**
 *  @class  Output 1 if the signal is greater than the value, otherwise outputs 0.
 *          can compare two signals or a signal and a number.
 *
 *  @constructor
 *  @extends {Tone.Signal}
 *  @param {number} [value=0] the value to compare to the incoming signal
 *  @example
 * var gt = new Tone.GreaterThan(2);
 * var sig = new Tone.Signal(4).connect(gt);
 * //output of gt is equal 1.
 */
Tone.GreaterThan = function(value){

	Tone.Signal.call(this);
	this.createInsOuts(2, 0);

	/**
	 *  subtract the amount from the incoming signal
	 *  @type {Tone.Subtract}
	 *  @private
	 */
	this._param = this.input[0] = new Tone.Subtract(value);
	this.input[1] = this._param.input[1];

	/**
	 *  compare that amount to zero
	 *  @type {Tone.GreaterThanZero}
	 *  @private
	 */
	this._gtz = this.output = new Tone.GreaterThanZero();

	//connect
	this._param.connect(this._gtz);
};

Tone.extend(Tone.GreaterThan, Tone.Signal);

/**
 *  dispose method
 *  @returns {Tone.GreaterThan} this
 */
Tone.GreaterThan.prototype.dispose = function(){
	Tone.Signal.prototype.dispose.call(this);
	this._gtz.dispose();
	this._gtz = null;
	return this;
};

export default Tone.GreaterThan;