var $AsyncScan = {
	
	"parameters" : {
		"channels"  : ["ZHeight", "TipBias", {"name":"SetPoint", "unit":"volt"}],
		"timeDelay" : 500, 			// unit: ms
		"initTipBias" : 0.0,  		// unit: V
		"initSetPoint" : 1.0, 		// unit: V
		"finiTipBias" : 1.0, 		// unit: V
		"finiSetPoint" : 2.0, 		// unit: V
		"xyScannerSize" : [0, 0],
		"xyScannerOffset" : [0, 0]
	},

	"addChannels" : function (chArray){
		for (var i in chArray){
			print('Add Ch: ' + chArray[i])
			spm.scan.channels.add(chArray[i])	
		}
		spm.scan.triggerLineScan()
		spm.sleep(50)
		spm.scan.stop()
		spm.sleep(50)
		spm.scan.stop()
		
	},

	"clearChannels" : function (){
		var chs = spm.scan.channels.names() 
		for (var i=0; i < chs.length; i++){
            		print('Remove Ch: '+chs[i])
            		spm.scan.channels.remove(chs[i])
            	}
	},
	
	"CalStep" : function (init, fini, TotalTime) {
		// Total Time unit: sec
		var stepCount = TotalTime*1000 / this.parameters.timeDelay 
		return (fini - init) / stepCount
	},
	
	"update" : function (aTipBias, aSetPoint) {
		spm.bias.tip = aTipBias;
		spm.zservo.setpoint.normValue = aSetPoint;
		print("Set Params. >> Bias (V): " + aTipBias + ", SetPoint (V): " + aSetPoint)
	},
	
	"init": function () {
		app.setPrintOutputVisible(false)
		this.clearChannels();
		this.addChannels(this.parameters.channels);
		var xySize =this.parameters.xyScannerSize;
		var xyOffset = this.parameters.xyScannerOffset;
		spm.xyscanner.moveTo(-1 * xySize[0]/2 + xyOffset[0], -1 * xySize[1]/2 + xyOffset[1])
		spm.sleep(2000)
	},

	"fini": function () {
		this.update(this.parameters.initTipBias, this.parameters.initSetPoint)
	},
	
	"run" : function (estimateTime){
		this.init();
		var tipBias = this.parameters.initTipBias;
		var setPoint = this.parameters.initSetPoint;
		print("Estimate Time: " + estimateTime + " sec");
		var stepTipBias = this.CalStep(tipBias, this.parameters.finiTipBias, estimateTime);
		var stepSetPoint = this.CalStep(setPoint, this.parameters.finiSetPoint, estimateTime);		
		print("Tip Bias Step: " + stepTipBias);
		print("SetPoint Step: " + stepSetPoint);

		this.update(tipBias, setPoint);
		spm.scan.triggerImageScan();
		spm.sleep(60);
		while (spm.scan.isImageScanning){
			tipBias += stepTipBias;
			setPoint += stepSetPoint;
			this.update(tipBias, setPoint);
			spm.sleep(this.parameters.timeDelay);
		}
		this.fini()
		print("Done Image Scan")
	}
};


var slowScanLineNum = 1 ;
var eachEndOverScanPercent = 0;
$AsyncScan.parameters.xyScannerSize = [5, 0];
$AsyncScan.parameters.xyScannerOffset = [0, 0];
$AsyncScan.parameters.timeDelay = 500;
eachEndOverScanPercent *= 0.04;
eachEndOverScanPercent += 1;
var estimateTime = slowScanLineNum / (spm.scan.rate * eachEndOverScanPercent);


$AsyncScan.run(estimateTime);