import Tone from "../core/Tone";
import "../component/CrossFade";
import "./Merge";
import "./Split";
import "../signal/Signal";
import "../signal/AudioToGain";
import "../signal/Zero";
import "../core/AudioNode";

/**
 *  @class  Tone.Panner is an equal power Left/Right Panner and does not
 *          support 3D. Panner uses the StereoPannerNode when available.
 *
 *  @constructor
 *  @extends {Tone.AudioNode}
 *  @param {NormalRange} [initialPan=0] The initail panner value (center).
 *  @example
 *  //pan the input signal hard right.
 *  var panner = new Tone.Panner(1);
 */
Tone.Panner = function() {

	var options = Tone.defaults(arguments, ["pan"], Tone.Panner);
	Tone.AudioNode.call(this);
	/**
	*  the panner node
	*  @type {StereoPannerNode}
	*  @private
	*/
	this._panner = this.input = this.output = this.context.createStereoPanner();

	/**
	*  The pan control. -1 = hard left, 1 = hard right.
	*  @type {AudioRange}
	*  @signal
	*/
	this.pan = this._panner.pan;

	//initial value
	this.pan.value = options.pan;
	this._readOnly("pan");
};

Tone.extend(Tone.Panner, Tone.AudioNode);

/**
 *  Defaults
 *  @type  {Object}
 *  @const
 *  @static
 */
Tone.Panner.defaults = {
	"pan" : 0,
};

/**
 *  Clean up.
 *  @returns {Tone.Panner} this
 */
Tone.Panner.prototype.dispose = function() {
	Tone.AudioNode.prototype.dispose.call(this);
	this._writable("pan");
	this._panner.disconnect();
	this._panner = null;
	this.pan = null;
	return this;
};

export default Tone.Panner;