var crfPrint={};

//printing section
//
crfPrint.set=
function(parentClass){
   this.parent=parentClass;
}

crfPrint.checkBlob=
function(){
	this.parent.print("checkBlob: "+this.blob);
	if (this.blob) {
		clearInterval(this.blobInterval);
		this.a.href = this.parent.config.window.URL.createObjectURL(this.blob);
		this.parent.print("HREF: "+this.a.href);
		this.a.download = 'test.pdf';
		this.a.click();
		this.parent.config.window.URL.revokeObjectURL(this.a.href);
	}
	this.count=this.count+1;
	this.parent.print("Eval: "+this.count);
	if (this.count>100){
		clearInterval(this.blobInterval);
	}

}

crfPrint.printForm=
function(){
   let that=this;
   let action=function(){that.afterScripts();};
   LABKEY.Utils.requiresScript(["crfTecant/blob-stream.js","crfTecant/pdfkit.standalone.js"],action);
}

crfPrint.afterScripts=
function(){
   let config=this.parent.config;
	this.doc=new PDFDocument();
   let that=this;
	//config.doc.end();
   let action=function(){that.blob=that.stream.toBlob("application/pdf");};
	this.stream = this.doc.pipe(blobStream()).on("finish",action);
	
	this.parent.print("BLob: "+this.blob);
	this.a = this.parent.config.document.createElement("a");
	this.parent.config.document.body.appendChild(this.a);
	this.a.innerHTML="Download PDF";
	this.a.style = "display: none";
	this.count=0;
	//run until blob is set
   let iAction=function(){that.checkBlob();}
   this.blobInterval=setInterval(iAction,1000);

	//pick data from crfForm list
   this.parent.print("Printing form");
	this.printHeader();

   let foo=function(){that.formatPrintData();};
	this.parent.setData(foo);
}

crfPrint.printHeader=
function(){
   let config=this.parent.config;
	this.doc.fontSize(25).text(config.formConfig.form['formName']);
	this.doc.moveDown();
	let crfEntry=config.formConfig.crfEntry;
	let site=config.formConfig.currentSite;
	let val=new Object();
	let user=config.formConfig.user;
	val['A']={o:crfEntry,f:'EudraCTNumber',t:'Eudra CT Number'};
	val['B']={o:crfEntry,f:'StudyCoordinator',t:'Study Coordinator'};
	val['C']={o:crfEntry,f:'StudySponsor',t:'Study Sponsor'};
	val['D']={o:site,f:'siteName',t:'Site'};
	val['E']={o:site,f:'sitePhone',t:'Phone'};
	val['F']={o:user,f:'DisplayName',t:'Investigator'};

	for (let f in val){
		this.parent.print('Printing for '+f);
		let e=val[f];
		let entry=new Object();
		entry[f]=e.o[e.f];
		this.printPDF(entry,
			{name:f,caption:e.t,type:'string'},null);
	}
	this.doc.moveDown();
}

crfPrint.formatPrintData=
function(){
   let config=this.parent.config;
	qS=this.parent.getQueryList();
	for (let q in qS){
		this.parent.print('Setting up '+q);
		let qData=this.parent.getQuerySnapshot(q);
      let qLayout=this.parent.getQueryLayout(q);
		this.parent.print('Number of rows: '+qData.rows.length);
		if (qData.rows.length>0){
			this.doc.fontSize(20).text(qLayout.title);
		}
      let fields=qLayout.fields;
		for (let i=0;i<qData.rows.length;i++){
			let entry=qData.rows[i];
		   for (let f in fields){
				let field=fields[f];
				let lookup=null;
				if (field.lookup){
					lookup=this.parent.getLookup(field.lookup.queryName);
				}
				if (field.hidden) continue;
				this.printPDF(entry,field,lookup);
			}
		}
		this.doc.moveDown();
	}
	this.parent.print("All done");
   this.doc.end();
}

crfPrint.printPDF=
function(entry,field,lookup){
	//object field should have a name, type, caption
	//entry should have field.name
	//lookup is null or has a lookup table LUT 
	//for value v of entry[field.name]
	//
	//the total width of a A4 page is 598 px, 
	//left margin is 72. With a right margin of 50,
	//the total available with is 476 px.
	
	let w=476;
	let spacing=25;
	let w1=(w-spacing)*0.5;
	let fontSize=14;	
	
	this.parent.print('printPDF: entry['+field.name+']='+entry[field.name]);
	let v=entry[field.name];
	if (lookup!=null){
		v=lookup.LUT[v];
	}
	this.parent.print('printPDF: field type:'+field.type);
	if (field.type=="date"){
		let d=new Date(v);
		v=d.getDate()+'/'+(d.getMonth()+1)+'/'+d.getFullYear();
	}	
	if (v===null) v=' / ';
	if (v===undefined) v=' / ';

	//measure text
	let label=field.caption;
	let opt={width:w1};
	this.doc.fontSize(fontSize);
	
	//for more eloquent display the height of the text
	//can be measured prior to output
	//use currentLineHeight to scale height
	//let lineH=config.doc.currentLineHeight(1);
	//let h=config.doc.heightOfString(label,opt)/lineH;


	//print label
	this.doc.font('Courier').text(label,opt);
	
	//align last row of description w/ first row of value
	this.doc.moveUp();

	//store x value for later use
	let tx=this.doc.x;
	let ty=this.doc.y;

	//shift for value output
	this.doc.x+=w1+spacing;
	
	this.doc.font('Courier-Bold').text(v,opt);

	//restore x value
	this.doc.x=tx;
	
}