package seng302;

import javafx.scene.paint.Color;
import org.w3c.dom.*;
import org.xml.sax.SAXException;
import seng302.Model.Boat;
import seng302.Model.BoatInRace;
import seng302.Model.Leg;

import javax.xml.parsers.ParserConfigurationException;
import java.io.IOException;
import java.util.ArrayList;

/**
 * Created by fwy13 on 26/03/2017.
 */
public class RaceXMLReader extends XMLReader{
    private ArrayList<BoatInRace> boats = new ArrayList<>();
    private Color[] colors = {Color.BLUEVIOLET, Color.BLACK, Color.RED, Color.ORANGE, Color.DARKOLIVEGREEN, Color.LIMEGREEN};//TODO make this established in xml or come up with a better system.
    private ArrayList<Leg> legs = new ArrayList<>();
    private GPSCoordinate mark, startPt1, startPt2, finishPt1, finishPt2, leewardPt1, leewardPt2, windwardPt1, windwardPt2;
    private GPSCoordinate mapTopLeft, mapBottomRight;
    private ArrayList<GPSCoordinate> boundary = new ArrayList<>();
    private static double COORDINATEPADDING = 0.0005;


    public RaceXMLReader(String filePath) throws IOException, SAXException, ParserConfigurationException {
        this(filePath, true);
    }

    public RaceXMLReader(String filePath, boolean read) throws IOException, SAXException, ParserConfigurationException {
        super(filePath);
        if (read) {
            read();
        }
    }

    private void read(){
        readCourse();
        readBoats();
        readLegs();
    }

    public void readBoats(){
        //get all boats
        NodeList nBoats = doc.getElementsByTagName("boat");

        for (int i = 0; i < nBoats.getLength(); i++){
            String name = getTextValueOfNode((Element) nBoats.item(i), "name");
            String abbrev = getTextValueOfNode((Element) nBoats.item(i), "abbr");
            double velo = Double.parseDouble(getTextValueOfNode((Element) nBoats.item(i), "speed"));
            //System.out.println(String.format("%s, %s, %s",name, abbrev, velo));
            BoatInRace boat = new BoatInRace(name, velo, colors[i], abbrev);
            boat.setCurrentPosition(startPt1);
            boats.add(boat);
        }
    }

    public void readLegs(){
        //get all legs
        NodeList nLegs = doc.getElementsByTagName("leg");

        for (int i = 0; i < nLegs.getLength(); i++){
            String label = getTextValueOfNode((Element) nLegs.item(i), "name");
            NodeList start = ((Element) nLegs.item(i)).getElementsByTagName("start");
            GPSCoordinate startCoord = getCoordinates(start);
            NodeList finish = ((Element) nLegs.item(i)).getElementsByTagName("finish");
            GPSCoordinate finishCoord = getCoordinates(finish);
            //System.out.println(String.format("%s, %s, %s, %s",label, startCoord, finishCoord, i));
            legs.add(new Leg(label, startCoord, finishCoord, i));
        }
    }

    public void readCourse(){
        NodeList nCourse = doc.getElementsByTagName("course");

        NodeList nBounds = ((Element)nCourse.item(0)).getElementsByTagName("boundaries");
        nBounds = ((Element) nBounds.item(0)).getElementsByTagName("coordinate");
        int maxLatitudeIndex = 0;
        double maxLatitude = -Double.MIN_VALUE;
        int maxLongitudeIndex = 0;
        double maxLongitude = -180;
        int minLatitudeIndex = 0;
        double minLatitude = Double.MAX_VALUE;
        int minLongitudeIndex = 0;
        double minLongitude = Double.MAX_VALUE;
        for (int i = 0; i < nBounds.getLength(); i++){
            boundary.add(getCoordinates((Element) nBounds.item(i)));
            if (boundary.get(i).getLatitude() > maxLatitude){
                maxLatitudeIndex = i;
                maxLatitude = boundary.get(i).getLatitude();
            }
            if (boundary.get(i).getLatitude() < minLatitude){
                minLatitudeIndex = i;
                minLatitude = boundary.get(i).getLatitude();
            }
            if (boundary.get(i).getLongitude() > maxLongitude){
                maxLongitudeIndex = i;
                maxLongitude = boundary.get(i).getLongitude();
            }
            if (boundary.get(i).getLongitude() < minLongitude){
                minLongitudeIndex = i;
                minLongitude = boundary.get(i).getLongitude();
            }
        }
        /*System.out.println(nBounds.getLength());
        System.out.println(maxLatitude);
        System.out.println(minLatitude);
        System.out.println(maxLongitude);
        System.out.println(minLongitude);*/

        double difference = 0;//this will hold the largest difference so we can make the map square.
        double latitudeDiff = Math.abs(Math.abs(boundary.get(maxLatitudeIndex).getLatitude()) - Math.abs(boundary.get(minLatitudeIndex).getLatitude()));
        double longitudeDiff = Math.abs(Math.abs(boundary.get(maxLongitudeIndex).getLongitude()) - Math.abs(boundary.get(minLongitudeIndex).getLongitude()));
        if (latitudeDiff >= longitudeDiff){
            difference = latitudeDiff - longitudeDiff;
            maxLongitude += difference/2;
            minLongitude -= difference/2;
        }else{
            difference = longitudeDiff - latitudeDiff;
            maxLatitude += difference/2;
            minLatitude -= difference/2;
        }
        maxLatitude += COORDINATEPADDING;
        minLatitude -= COORDINATEPADDING;
        maxLongitude += COORDINATEPADDING;
        minLongitude -= COORDINATEPADDING;
        //now create map boundaries
        //top left canvas point is min logitude, max latitude
        //bottom right of canvas point is min longitude, max latitude.
        mapTopLeft = new GPSCoordinate(minLatitude, minLongitude);
        mapBottomRight = new GPSCoordinate(maxLatitude, maxLongitude);

        NodeList nMarks = ((Element)nCourse.item(0)).getElementsByTagName("marker");
        startPt1 = getCoordinates(nMarks, 0);
        startPt2 = getCoordinates(nMarks, 0, 1);
        mark = getCoordinates(nMarks, 1);
        windwardPt1 = getCoordinates(nMarks, 2);
        windwardPt2 = getCoordinates(nMarks, 2, 1);
        leewardPt1 = getCoordinates(nMarks, 3);
        leewardPt2 = getCoordinates(nMarks, 3, 1);
        finishPt1 = getCoordinates(nMarks, 4);
        finishPt2 = getCoordinates(nMarks, 4, 1);
    }

    private GPSCoordinate getCoordinates(NodeList start){
        return getCoordinates(start, 0);
    }

    private GPSCoordinate getCoordinates(NodeList start, int startIndex){
        return getCoordinates(start, startIndex, 0);
    }

    private GPSCoordinate getCoordinates(NodeList start, int startIndex, int nodeIndex){
        NodeList nodeList = ((Element) start.item(startIndex)).getElementsByTagName("coordinate");
        Element coord = (Element) nodeList.item(nodeIndex);
        return getCoordinates(coord);
    }

    /**
     * Returns the coordinate TODO raise exception that runs when the XML is formatted wrongly.
     * @param coordNode
     * @return
     */
    private GPSCoordinate getCoordinates(Element coordNode){

        double startLat = Double.parseDouble(getTextValueOfNode(coordNode, "latitude"));
        double startLong = Double.parseDouble(getTextValueOfNode(coordNode, "longitude"));
        return new GPSCoordinate(startLat, startLong);
    }

    public ArrayList<BoatInRace> getBoats() {
        return boats;
    }

    public ArrayList<Leg> getLegs() {
        return legs;
    }

    public GPSCoordinate getMark() {
        return mark;
    }

    public GPSCoordinate getStartPt1() {
        return startPt1;
    }

    public GPSCoordinate getStartPt2() {
        return startPt2;
    }

    public GPSCoordinate getFinishPt1() {
        return finishPt1;
    }

    public GPSCoordinate getFinishPt2() {
        return finishPt2;
    }

    public GPSCoordinate getLeewardPt1() {
        return leewardPt1;
    }

    public GPSCoordinate getLeewardPt2() {
        return leewardPt2;
    }

    public GPSCoordinate getWindwardPt1() {
        return windwardPt1;
    }

    public GPSCoordinate getWindwardPt2() {
        return windwardPt2;
    }

    public ArrayList<GPSCoordinate> getBoundary() {
        return boundary;
    }

    public GPSCoordinate getMapTopLeft() {
        return mapTopLeft;
    }

    public GPSCoordinate getMapBottomRight() {
        return mapBottomRight;
    }
}