package nl.reader.csv;

import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import javax.xml.parsers.DocumentBuilder;
import org.w3c.dom.Document;
import org.w3c.dom.NodeList;
import org.w3c.dom.Node;
import org.w3c.dom.Element;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.io.StringWriter;
import java.util.Scanner;

/**
 * This class reads the XML with the possible users?
 */
public class ReadXML {

public static void main(String args[]) {

		//String id = "2";
		//getUser(id);

	  }

	/**
	 * this class gets the specific user from the XML file
	 * @param userID specifies which user to read from the XML file
	 * @return
	 */
	public static String getUser(String userID) {
		try {

			String StubStore = System.getenv("StubStore");
			File indexIn = new File(StubStore+"stubstore/Templates/Naming.xml");
			//File indexOut = new File(StubStore+"stubstore/Output/index.xml");
			DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
			DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
			Document doc = dBuilder.parse(indexIn);
			String payLoad;


			doc.getDocumentElement().normalize();

			//Element nList = doc.getDocumentElement();
			NodeList nList = doc.getElementsByTagName("user");

			for (int temp = 0; temp < nList.getLength(); temp++) {

				Node nNode = nList.item(temp);
				//System.out.println("\nCurrent Element :" + nNode.getNodeName());
				if (nNode.getNodeType() == Node.ELEMENT_NODE) {

					Element eElement = (Element) nNode;
					String id =  eElement.getElementsByTagName("id").item(0).getTextContent();
					String name =  eElement.getElementsByTagName("name").item(0).getTextContent();
					String csvFile = StubStore +"stubstore/Data/dataFile1.csv";
					String line = null;
					String cvsSplitBy = ",";

						try (BufferedReader br = new BufferedReader(new FileReader(csvFile))) {

							while ((line = br.readLine()) != null) {

								// use comma as separator
								String[] user = line.split(cvsSplitBy);
								if (user[0].equals(userID)) {
								id = user[0];
								name = user[1];
								//System.out.println("Id : " + id);
								//System.out.println("Name : " + name);
								}

							}
							eElement.getElementsByTagName("id").item(0).setTextContent(id);
							eElement.getElementsByTagName("name").item(0).setTextContent(name);

							TransformerFactory transformerFactory = TransformerFactory.newInstance();
							Transformer transformer = transformerFactory.newTransformer();
							DOMSource source = new DOMSource(doc);
							StringWriter sw = new StringWriter();
							//StreamResult result = new StreamResult(indexOut);
							//StreamResult payLoad = new StreamResult(source.toString());
							//transformer.transform(source, result);
							transformer.transform(source, new StreamResult(sw));
							payLoad = sw.toString();
							return payLoad;


						} catch (IOException e) {
							e.printStackTrace();
						}
				}

			}
		    } catch (Exception e) {
			e.printStackTrace();
		    }
		return "";

	}
}