package seng302.Data;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import seng302.Exceptions.InvalidRegattaDataException;
import seng302.Mock.Regatta;
import seng302.Mock.RegattaDataSource;

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

/**
 * Created by esa46 on 25/04/17.
 */
public class RegattaData {


    private RegattaDataSource regattaDataSource;


    public RegattaData(RegattaDataSource regattaDataSource) {
        this.regattaDataSource = regattaDataSource;
    }

    public String createXML() {


        Regatta regatta = regattaDataSource.getRegatta();

        try {
            DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance();
            DocumentBuilder docBuilder = docFactory.newDocumentBuilder();

            //root element
            Document doc = docBuilder.newDocument();
            Element rootElement = doc.createElement("RegattaConfig");
            doc.appendChild(rootElement);

            //regattaID element
            Element regattaID = doc.createElement("RegattaID");
            regattaID.appendChild(doc.createTextNode(Integer.toString(regatta.getRegattaID())));
            rootElement.appendChild(regattaID);

            //regattaName element
            Element regattaName = doc.createElement("RegattaName");
            regattaName.appendChild(doc.createTextNode(regatta.getRegattaName()));
            rootElement.appendChild(regattaName);

            //courseName element
            Element courseName = doc.createElement("CourseName");
            courseName.appendChild(doc.createTextNode(regatta.getCourseName()));
            rootElement.appendChild(courseName);

            //centralLatitude element
            Element centralLat = doc.createElement("CentralLatitude");
            centralLat.appendChild(doc.createTextNode(Double.toString(regatta.getCentralLatitude())));
            rootElement.appendChild(centralLat);

            //centralLongitude element
            Element centralLong = doc.createElement("CentralLongitude");
            centralLong.appendChild(doc.createTextNode(Double.toString(regatta.getCentralLongitude())));
            rootElement.appendChild(centralLong);

            //centralAltitude element
            Element centralAlt = doc.createElement("CentralAltitude");
            centralAlt.appendChild(doc.createTextNode(Double.toString(regatta.getCentralAltitude())));
            rootElement.appendChild(centralAlt);

            //utcOffset element
            Element utcOffset = doc.createElement("UtcOffset");
            utcOffset.appendChild(doc.createTextNode(Double.toString(regatta.getUtcOffset())));
            rootElement.appendChild(utcOffset);

            //magneticVariation element
            Element magneticVariation = doc.createElement("MagneticVariation");
            magneticVariation.appendChild(doc.createTextNode(Double.toString(regatta.getMagneticVariation())));
            rootElement.appendChild(magneticVariation);

            // write the content into xml file
            TransformerFactory transformerFactory = TransformerFactory.newInstance();
            Transformer transformer = transformerFactory.newTransformer();
            DOMSource source = new DOMSource(doc);

            //Serialize document.
            StringWriter stringWriter = new StringWriter();
            StreamResult result = new StreamResult(stringWriter);
            transformer.transform(source,result);

            return stringWriter.toString();


        } catch (ParserConfigurationException pce) {
            throw new InvalidRegattaDataException();
        } catch (TransformerException tfe) {
            throw new InvalidRegattaDataException();
        }
    }

}