// ShowColorScale.java
// A solution to CS 10 assignment 2, part 2, Fall 2008
// cmc 8/14/08

import java.awt.Color;
import java.util.Scanner;

public class ShowColorScale {

    private static Scanner input; // used in all methods

    public static void main(String[] args) {
        input = new Scanner(System.in);

        // let utility method get the first and last colors
        Color c1 = getColor("First Color");
        Color c2 = getColor("Last Color");

        // get the number of levels - insure an int >= 2
        int levels = 0;
        while (levels < 2) {
            System.out.print("Enter number of levels >= 2: ");
            if (input.hasNextInt()) {
                levels = input.nextInt();
                if (levels < 2) {
                    System.err.println("entered < 2: " + levels);
                    levels = 0;
                }
            }
            else if (input.hasNext()) {
                String junk = input.next();
                System.err.println("entered non-int: " + junk);
            }
        }

        // create color scale, get array of colors, and display
        ColorScale scale = new ColorScale(c1, c2, levels);
        Color[] colors = new Color[scale.size()];
        for (int i=0; i < scale.size(); i++)
            colors[i] = scale.get(i);
        CS10Display.show(colors);
    }

    // utility gets a valid color from the user
    private static Color getColor(String prompt) {
        final Color[] stockColors = { Color.BLACK, Color.BLUE, Color.CYAN,
            Color.DARK_GRAY, Color.GRAY, Color.GREEN, Color.LIGHT_GRAY,
            Color.MAGENTA, Color.ORANGE, Color.PINK, Color.RED, Color.WHITE,
            Color.YELLOW };
        final String[] stockNames = { "BLACK", "BLUE", "CYAN", "DARK_GRAY",
            "GRAY", "GREEN", "LIGHT_GRAY", "MAGENTA", "ORANGE", "PINK",
            "RED", "WHITE", "YELLOW" };

        Color result = null;
        while (result == null) {
            System.out.println("Select " + prompt + " by number:");
            for (int i=0; i < stockNames.length; i++)
                System.out.printf("  %d: %s%n", i + 1, stockNames[i]);
            System.out.printf("  %d: %s%n", stockNames.length + 1, "Other");

            if (input.hasNextInt()) {
                int i = input.nextInt() - 1;
                if (i >= 0 && i < stockNames.length)
                    result = stockColors[i];
                else if (i == stockNames.length)
                    result = new Color(get("red"), get("green"), get("blue"));
                else
                    System.err.println("no such choice: " + (i + 1));
            }
            else if (input.hasNext())
                System.err.println("choice not int: " + input.next());
        }
        return result;
    }

    // utility used by getColor to get int value in proper range from user
    private static int get(String name) {
        int result = -1;
        while (result < 0 || result > 255) {
            System.out.printf("Enter amount of %s (0 to 255): ", name);
            if (input.hasNextInt()) {
                result = input.nextInt();
                if (result < 0 || result > 255) {
                    System.err.println("amount out of range");
                    result = -1;
                }
            }
            else if (input.hasNext())
                System.err.println("amount not int: " + input.next());
        }
        return result;                
    }
}