package eu.eudat.utilities.builders;

import java.io.IOException;
import java.io.StringReader;
import java.io.StringWriter;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;

import eu.eudat.entities.xmlmodels.viewstyledefinition.FieldSet;


public class XmlBuilder {

	public static Document getDocument(){
		DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance();
		DocumentBuilder docBuilder;
		try {
			docBuilder = docFactory.newDocumentBuilder();
			Document doc = docBuilder.newDocument();
			return doc;
		} catch (ParserConfigurationException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
			return null;
		}
	}
	
	public static String generateXml(Document doc){
		TransformerFactory tFact = TransformerFactory.newInstance();
        Transformer trans;
		try {
			trans = tFact.newTransformer();		
			StringWriter writer = new StringWriter();
        	StreamResult result = new StreamResult(writer);
        	DOMSource source = new DOMSource(doc);
			trans.transform(source, result);
			return writer.toString();
		} catch (TransformerException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
			return null;
		}
	}
	
	public static Document fromXml(String xml){
		DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance();
		DocumentBuilder docBuilder;
		try {
			docBuilder = docFactory.newDocumentBuilder();
		    InputSource inputStream = new InputSource(new StringReader(xml));
			Document doc = docBuilder.parse(inputStream);
			return doc;
		} catch (ParserConfigurationException | SAXException | IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
			return null;
		}
	}
	
	public static Element getNodeFromListByTagName(NodeList list, String tagName) {
		for (int temp = 0; temp < list.getLength(); temp++) {
			Node element = list.item(temp);				
			if (element.getNodeType() == Node.ELEMENT_NODE) {
				if(element.getNodeName().equals(tagName))return (Element) element;
			}
		}
		return null;
	}
}