import javafx.geometry.Point2D;
import javafx.scene.canvas.GraphicsContext;
import javafx.scene.paint.Color;
import javafx.scene.text.Font;
import java.io.*;
import java.util.ArrayList;

public class Node {
    public static int    RADIUS = 15;

    private String              label;
    private Point2D             location;
    private ArrayList<Edge>     incidentEdges;
    private boolean             selected;

    public Node() { this("", new Point2D(0,0)); }
    public Node(String aLabel) { this(aLabel, new Point2D(0,0)); }
    public Node(Point2D aPoint) { this("", aPoint); }
    public Node(double x, double y) { this("", new Point2D(x,y)); }
    public Node(String aLabel, Point2D aPoint) {
        label = aLabel;
        location = aPoint;
        incidentEdges = new ArrayList<Edge>();
        selected = false;
    }

    public String getLabel() { return label; }
    public Point2D getLocation() { return location; }
    public void setLabel(String newLabel) { label = newLabel; }
    public void setLocation(Point2D aPoint) { location = aPoint; }
    public void setLocation(double x, double y) { location = new Point2D(x, y); }
    public boolean isSelected() { return selected; }
    public void setSelected(boolean state) { selected = state; }
    public void toggleSelected() { selected = !selected; }


    public ArrayList<Edge> incidentEdges() { return incidentEdges; }
    public void addIncidentEdge(Edge e) { incidentEdges.add(e); }

    // Return a list of all neighbouring Nodes
    public ArrayList<Node> neighbours() {
        ArrayList<Node> result = new ArrayList<Node>();

        for (Edge e: incidentEdges)
            result.add(e.otherEndFrom(this));

        return result;
    }

    // Nodes look like this: label(12,43)
    public String toString() {
        return(label + "(" + location.getX() + "," + location.getY() + ")");
    }

    // Draw the Node using the given pen
    public void draw(GraphicsContext aPen) {
        // Draw a blue-filled circle around the center of the node
        if (selected)
            aPen.setFill(Color.RED);
        else
            aPen.setFill(Color.color(0.6, 0.6, 1.0));

        aPen.fillOval(location.getX() - RADIUS, location.getY() - RADIUS, RADIUS*2, RADIUS*2);

        // Draw a black border around the circle
        aPen.setStroke(Color.BLACK);
        aPen.strokeOval(location.getX() - RADIUS, location.getY() - RADIUS, RADIUS*2, RADIUS*2);

        // Draw a label at the top right corner of the node
        aPen.setFont(Font.font("Arial", 14));
        aPen.setFill(Color.BLACK);
        aPen.fillText(label, location.getX() + RADIUS, location.getY() - RADIUS);
    }

    // Save node to given file.  Note that incident edges are not saved.
    public void saveTo(PrintWriter aFile) {
        aFile.println(label);
        aFile.println((int)location.getX());
        aFile.println((int)location.getY());
        aFile.println(selected);
    }
    // Load a node from given file.  Note that incident edges are not connected
    public static Node loadFrom(BufferedReader aFile) throws IOException {
        Node   aNode = new Node();

        aNode.setLabel(aFile.readLine());
        aNode.setLocation(Integer.parseInt(aFile.readLine()),
                          Integer.parseInt(aFile.readLine()));
        aNode.setSelected(Boolean.valueOf(aFile.readLine()).booleanValue());
        return aNode;
    }
}