package seng302.Data;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import seng302.Exceptions.InvalidRaceDataException;
import seng302.GPSCoordinate;
import seng302.Model.BoatInRace;
import seng302.Model.Marker;
import seng302.Mock.RaceDataSource;

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;
import java.time.OffsetDateTime;
import java.util.List;

/**
 * Created by esa46 on 21/04/17.
 */
public class RaceData {

    private RaceDataSource dataSource;
    Document doc;
    Element raceElement;

    private OffsetDateTime creationTimeDate;
    private OffsetDateTime raceStartTime;
    private List<BoatInRace> participants;
    private List<Marker> course;
    private List<GPSCoordinate> courseLimit;

    public RaceData(RaceDataSource dataSource) {
        this.dataSource = dataSource;
        creationTimeDate = OffsetDateTime.now();
        raceStartTime = OffsetDateTime.now().plusMinutes(3);
        participants = dataSource.getBoats();
        course = dataSource.getMarkers();
        courseLimit = dataSource.getBoundary();
    }

    public String createXML() {

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


            //root element;
            raceElement = doc.createElement("Race");
            doc.appendChild(raceElement);

            appendRaceId();
            appendRaceType();

            Element creationTimeElement = doc.createElement("CreationTimeDate");
            creationTimeElement.appendChild(doc.createTextNode(creationTimeDate.toString()));
            raceElement.appendChild(creationTimeElement);

            Element startTimeElement = doc.createElement("RaceStartTime");
            startTimeElement.setAttribute("Time", raceStartTime.toString());
            startTimeElement.setAttribute("Postpone", "false");
            raceElement.appendChild(startTimeElement);


            Element participantsElement = doc.createElement("Participants");

            for (BoatInRace boat : participants) {
                Element yachtElement = doc.createElement("Yacht");
                yachtElement.setAttribute("SourceID", boat.getSourceID() + "");
                participantsElement.appendChild(yachtElement);
            }

            raceElement.appendChild(participantsElement);



            Element courseElement = doc.createElement("Course");
            Element compoundMarkSeqElement = doc.createElement("CompoundMarkSequence");

            int i = 1;
            for (Marker marker : course) {
                Element compoundMarkElement = doc.createElement("CompoundMark");
                compoundMarkElement.setAttribute("CompoundMarkId", i + "");
                compoundMarkElement.setAttribute("Name", marker.getName());

                Element mark1 = doc.createElement("Mark");
                mark1.setAttribute("TargetLat", marker.getMark1().getLatitude() + "");
                mark1.setAttribute("TargetLng", marker.getMark1().getLongitude() + "");

                compoundMarkElement.appendChild(mark1);

                if (!(marker.getMark1().equals(marker.getMark2()))) {
                    Element mark2 = doc.createElement("Mark");
                    mark2.setAttribute("TargetLat", marker.getMark2().getLatitude() + "");
                    mark2.setAttribute("TargetLng", marker.getMark2().getLongitude() + "");
                    compoundMarkElement.appendChild(mark2);
                }

                courseElement.appendChild(compoundMarkElement);


                Element cornerElement = doc.createElement("Corner");
                cornerElement.setAttribute("SeqID", i + "");
                cornerElement.setAttribute("CompoundMarkID", i + "");

                compoundMarkSeqElement.appendChild(cornerElement);

                i++;
            }

            raceElement.appendChild(compoundMarkSeqElement);
            raceElement.appendChild(courseElement);


            int j = 1;

            Element courseLimitElement = doc.createElement("CourseLimit");
            for (GPSCoordinate coordinate : courseLimit) {
                Element limitElement = doc.createElement("Limit");
                limitElement.setAttribute("SeqID", j + "");

                limitElement.setAttribute("Lat", coordinate.getLatitude() + "");
                limitElement.setAttribute("Lon", coordinate.getLongitude() + "");

                courseLimitElement.appendChild(limitElement);

                j++;
            }

            raceElement.appendChild(courseLimitElement);


            // 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 InvalidRaceDataException();
        } catch (TransformerException tfe) {
            throw new InvalidRaceDataException();
        }
    }

    private void appendRaceId() {
        Element raceIdElement = doc.createElement("RaceID");
        raceIdElement.appendChild(doc.createTextNode(dataSource.getRaceId()));
        raceElement.appendChild(raceIdElement);
    }

    private void appendRaceType() {
        Element raceTypeElement = doc.createElement("RaceType");
        raceTypeElement.appendChild(doc.createTextNode(dataSource.getRaceType()));
        raceElement.appendChild(raceTypeElement);
    }



}