/* 
a program to paint, centered on the canvas, a circle of dots of a given color, with spaces. 
*/

package npw;

import painter.SPainter;
import shapes.SCircle;
import shapes.SSquare;

import javax.swing.*;
import java.awt.*;
import java.util.Scanner;

public class SimpleDots {

    private void paintTheImage() {
        // get the input info
        int radius = getNumber("circle radius");
        int rad = getNumber("dot radius");
        // establish painter
        SPainter painter = new SPainter("SimpleDots", radius * 2 + 50, radius * 2 + 50);
        changeColor(painter);
        painter.setBrushWidth(3);
        SCircle circle = new SCircle(radius);
        SCircle dot = new SCircle(rad);
        // paint the dots
        paintCircleOfDots(painter, circle, dot);
    }

    private void paintCircleOfDots(SPainter painter, SCircle circle, SCircle dot) {
        // position the painter to begin drawing the rows
        painter.mfd(circle.radius());
        painter.tr();
        // paint the circle of dots
        double moved = 0;
        while (moved < circle.diameter()) {
            double chord = chordLength(circle.radius() - moved, circle);
            int dots = dotsOnLineCount(chord, dot.diameter());
            paintRow(painter, dot, dots);
            nextRow(painter, dot.diameter());
            moved = moved + dot.diameter();
        }
        // make the method invariant with respect to painter position
        painter.tl();
        painter.mfd(circle.radius());
    }

    // move to the next row
    private void nextRow(SPainter painter, double rowHeight) {
        painter.tr();
        painter.mfd(rowHeight);
        painter.tl();
    }

    // assumes the painter is at the center of the row to paint, facing right.
    private void paintRow(SPainter painter, SCircle dot, int dotsToPaint) {
        // move backward one half of the length we're painting to get ready to paint the row
        double centerOffset = ((dotsToPaint * dot.diameter()) / 2) - dot.diameter() / 2;
        painter.mbk(centerOffset);
        // paint the row of squares
        int painted = 0;
        while (painted < dotsToPaint) {
            paintOneDot(painter, dot);
            painter.mfd(dot.diameter());
            painted = painted + 1;
        }
        // make the method invariant with respect to painter position
        painter.mbk(centerOffset + dot.diameter());
    }

    private void paintOneDot(SPainter painter, SCircle dot) {
        dot.shrink(10);
        painter.paint(dot);
        dot.expand(10);
    }

    private static int dotsOnLineCount(double lineLength, double sideLength) {
        int dots = ((int) Math.ceil((lineLength - sideLength) / sideLength) + 1);
        return dots;
    }

    private double chordLength(double yOffset, SCircle circle) {
        double xLength = Math.sqrt(Math.pow(circle.radius(), 2) - Math.pow(yOffset, 2));
        double chordLength = xLength * 2;
        return chordLength;
    }

    private static int getNumber(String prompt) {
        String nss = JOptionPane.showInputDialog(null, prompt + "?");
        Scanner scanner = new Scanner(nss);
        return scanner.nextInt();
    }

    private void changeColor(SPainter painter) {
        String choose = JOptionPane.showInputDialog(null, "red, blue, or green?");
        Scanner scanner = new Scanner(choose);
        if (choose.equalsIgnoreCase("blue")) {
            painter.setColor(Color.blue);
        } else if (choose.equalsIgnoreCase("red")) {
            painter.setColor(Color.red);
        } else if (choose.equalsIgnoreCase("green")) {
            painter.setColor(Color.green);
        } else {
            painter.setColor(Color.black);
        }
    }

    public SimpleDots() {
        paintTheImage();
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                new SimpleDots();
            }
        });
    }
}