import java.text.DecimalFormat; // for formatting
import java.awt.Color;
import uwcse.graphics.*;

/**
 * A class to illustrate the use of a 2D array.<br>
 * The methods of the class initialize a 2D array, namely
 * an array to store the daily rainfall amount over 3 months. The
 * monthly rainfall average is computed.
 */

public class TwoDimensionalArray{

    /**
     * Initialize a 2D array to store the daily rainfall over
     * a 3 months period (namely April, May and June). Do initialization
     * in a private method (assign to each element a random double between
     * 0 and 10).<br>
     * Then, compute and print the monthly rainfall average.
     */
    public void processRainfall()
    {
        // Store in an array the daily rainfall
        // over a period of 3 months (April, May, June)
        // rainfall should be an array of 3 1D arrays (each 1D array
        // is of size 30, 31 and 30).
        double[][] rainfall = new double[3][];
        rainfall[0] = new double[30]; // April
        rainfall[1] = new double[31]; // May
        rainfall[2] = new double[30]; // June

        // Initialize the array
        // (call fillRandomly)
        this.fillRandomly(rainfall);

        // Compute and print the average rainfall for each month
        // (call computeAndPrintMonthlyAverage)
        this.computeAndPrintMonthlyAverage(rainfall);
        
        // display the array
        this.display(rainfall);
    }

    /**
     * Initialize the elements of a 2D array with a random double between
     * 0 and 10.
     * @param rainfall the array to initialize
     */
    private void fillRandomly(double[][] rainfall)
    {
        // Fill randomly the array with a random value between 0 and 10
        for (int r = 0; r < rainfall.length; r ++) {
            for (int c = 0; c < rainfall[r].length; c ++) {
                rainfall[r][c] = Math.random() * 10;
            }
        }
    }

    /**
     * Computes and prints the daily average per month
     * @param rainfall the array to average
     */
    private void computeAndPrintMonthlyAverage(double[][] rainfall)
    {
        String[] month = {"April", "May", "June"};
        DecimalFormat df = new DecimalFormat("0.00");
        for (int m = 0; m < rainfall.length; m ++) {
            double sum = 0;
            for (int d = 0; d < rainfall[m].length; d ++) {
                sum += rainfall[m][d];
            }
            System.out.println("In " + month[m] + 
            ", the average daily rainfall is " + 
            df.format(sum / rainfall[m].length));
        }
    }
    
    /*
     * Displays the array graphically: draws the table,
     * and fills the squares of the table with a color 
     * corresponding to the rainfall amount (red = 0, 
     * green = 10)
     * @param rainfall the array that contains the rainfall amounts
     */
    private void display(double[][] rainfall) {
        
        // A 2D array of rectangles: each rectangle
        // corresponds to a rainfall amount.
        Rectangle[][] rects = new Rectangle[rainfall.length][];
        for (int m = 0; m < rainfall.length; m ++) {
            rects[m] = new Rectangle[rainfall[m].length];
        }
        
        // Create squares of side 15
        // upper left corner of the first rectangle 
        int x = 20;
        int y = 20;
        GWindow window = new GWindow();
        for (int m = 0; m < rects.length; m ++) {
            for (int d = 0; d < rects[m].length; d ++) {
                // color of the square
                int blue = 0;
                int red = 
                (int) ((1 - rainfall[m][d] / 10) * 255);
                int green = 
                (int) (( rainfall[m][d] / 10 ) * 255);
                Color c = new Color(red, green, blue);
                
                rects[m][d] = new Rectangle(x, y, 15, 15, 
                                            c, true);
                window.add(rects[m][d]);
                // next rectangle
                x += 15;
            }
            // next line of rectangles
            y += 20;
            x = 20;
        }
        
    }
    
    
    

}