/* 
 * A program to paint, centered on the canvas, a circle of single colored, non-framed circles. 
 */

package npw;

import painter.SPainter;
import shapes.SCircle;
import javax.swing.*;
import java.awt.*;
import java.util.Scanner;

public class SimpleDots {
    private void paintTheImage(){
        // Get the input information
        int radius = getNumber("circle radius");
        int radius2 = getNumber("circles radius");

        // Establish the painter
        SPainter painter = new SPainter("Simple Dots", radius*2+50, radius*2+50);
        painter.setColor(randomColor());
        painter.setBrushWidth(3);
        SCircle circle = new SCircle(radius);
        SCircle circle2 = new SCircle(radius2);

        // Paint the circles
        paintCircleOfCircles(painter, circle, circle2);
    }

    private void paintCircleOfCircles(SPainter painter, SCircle circle, SCircle circle2){
        // Position the painter to begin drawing the rows
        painter.mfd(circle.radius());
        painter.tr();
        // Paint the circle of squares
        double moved = 0;
        while (moved < circle.diameter()) {
            double chord = chordLength(circle.radius() - moved, circle);
            int circles = squaresOnLineCount(chord, circle2.radius());
            paintRow(painter, circle2, circles);
            nextRow(painter, circle2.radius());
            moved = moved + circle2.radius();
        }
        // 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 circle2, int circlesToPaint){
        // Move backward 1/2 of the length we're painting to get ready to paint the row.
        double centerOffset = ( (circlesToPaint * circle2.radius()) / 2) - circle2.radius()/2;
        painter.mbk(centerOffset);

        // Paint the row of squares.
        int painted = 0;
        while (painted < circlesToPaint){
            paintOneCircle(painter, circle2);
            painter.mfd(circle2.radius());
            painted = painted + 1;
        }

        // Make the method invariant with respect to painter position.
        painter.mbk(centerOffset + circle2.radius());
    }

    private void paintOneCircle(SPainter painter, SCircle circle2){
        circle2.s5();
        painter.paint(circle2);
        // REMOVED BLACK OUTLINE
        painter.draw(circle2);
        circle2.x5();
    }

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

    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 static Color randomColor() {
        while (true) {
            String command = JOptionPane.showInputDialog(null, "Command? Red, Green, or Blue");
            if (command == null) {
                command = "exit";
            } // user clicked on Cancel
            if (command.equalsIgnoreCase("blue")) {
                return Color.blue;
            } else if (command.equalsIgnoreCase("red")) {
                return Color.red;
            } else if (command.equalsIgnoreCase("green")) {
                return Color.green;
            } else {
                return Color.black;
            }
        }
    }

    public SimpleDots() { paintTheImage(); }

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