Kuebjii's Console V1.1

import javafx.scene.paint.Stop;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.Scanner;
import java.util.Random;
import java.util.concurrent.TimeUnit;
import java.awt.Graphics;

class Colors {
    public static final String RESET = "\u001B[0m";
    public static final String BLACK = "\u001B[30m";
    public static final String RED = "\u001B[31m";
    public static final String GREEN = "\u001B[32m";
    public static final String YELLOW = "\u001B[33m";
    public static final String BLUE = "\u001B[34m";
    public static final String PURPLE = "\u001B[35m";
    public static final String CYAN = "\u001B[36m";
    public static final String WHITE = "\u001B[37m";
}

public class Main {

    public static void input() {
        Scanner reader = new Scanner(System.in);
        System.out.print(Colors.GREEN + "> " + Colors.RESET);
        String input = reader.nextLine();

        if (input.equals("hello") || input.equals("HELLO")) {
            System.out.println("Hello World!");
            input();
        }
        if (input.equals("help")) {
            System.out.println(Colors.RED + "Commands:" + Colors.RESET);
            System.out.println(Colors.RED + "hello - outputs Hello World" + Colors.RESET);
            System.out.println(Colors.RED + "help - you're already here" + Colors.RESET);
            System.out.println(Colors.RED + "shutdown - shuts the console down" + Colors.RESET);
            System.out.println(Colors.RED + "exit - shuts the console down" + Colors.RESET);
            System.out.println(Colors.RED + "run - runs a program" + Colors.RESET);
            System.out.println(Colors.RED + "run help - displays all programs you can run" + Colors.RESET);
            System.out.println(Colors.RED + "back - takes you back to the main menu" + Colors.RESET);
            System.out.println(Colors.RED + "time - says your current time and date" + Colors.RESET);
            System.out.println(Colors.RED + "flip - flips a coin" + Colors.RESET);
            input();
        }
        if (input.equals("shutdown") || input.equals("exit")) {
            System.exit(0);
        }
        if (input.equals("run help")) {
            System.out.println(Colors.RED + "Programs:" + Colors.RESET);
            System.out.println(Colors.RED + "scalculator - shape calculator, defines area, circumference, and similar items" + Colors.RESET);
            System.out.println(Colors.RED + "calculator - simple calculator" + Colors.RESET);
            input();
        }

        if (input.equals("run calculator")) {
            normalCalculator();
        }

        if (input.equals("run scalculator")) {
            KuebjiiCalculatorMenu();
        }

        if (input.equals("back"))
        {
            mainMenu();
        }

        if (input.equals("time"))
        {
            SimpleDateFormat formatter= new SimpleDateFormat("yyyy-MM-dd 'at' HH:mm:ss z");
            Date date = new Date(System.currentTimeMillis());
            System.out.println(formatter.format(date));
            input();
        }
        if (input.equals("flip"))
        {
            if (Math.random() < 0.5){
                System.out.println("Heads");
            }else{
                System.out.println("Tails");
            }
        }
        if (input.equals("clear"))
        {
            System.out.println();System.out.println();System.out.println();System.out.println();System.out.println();System.out.println();System.out.println();System.out.println();System.out.println();
            System.out.println();System.out.println();System.out.println();System.out.println();System.out.println();System.out.println();System.out.println();System.out.println();System.out.println();
            System.out.println();System.out.println();System.out.println();System.out.println();System.out.println();System.out.println();System.out.println();System.out.println();System.out.println();
            input();
        }
        else
        {
            System.out.println("Command: " + input + " was not found!");
            mainMenu();
        }
    }

    public static void mainMenu() {
        Scanner reader = new Scanner(System.in);
        System.out.println(Colors.RED + "Kuebjii's Console" + Colors.RESET);
        System.out.println(Colors.RED + "Please enter your comamand below" + Colors.RESET);
        System.out.println();
        input();
    }

    public static void main(String[] args) throws InterruptedException {
        Scanner reader = new Scanner(System.in);
        System.out.print(Colors.GREEN + "> " + Colors.RESET);
        String input = reader.findInLine("start");

        if (input.equals("start")) {
            System.out.println(Colors.GREEN + "Booting Console" + Colors.RESET);
            Thread.sleep(500);
            System.out.println(Colors.GREEN + "Console Loaded" + Colors.RESET);
            Thread.sleep(500);
            System.out.println(Colors.GREEN + "Showing Console Now!" + Colors.RESET);
            Thread.sleep(50);
            mainMenu();
        } else {
            System.out.println("System.Start Error: Entered unknown command");
        }
    }

    /// ######################################################################## SHAPE CALCULATOR ######## DO NOT TOUCH ########################################################
    public static void KuebjiiCalculatorMenu() {
        Scanner reader = new Scanner(System.in);
        System.out.println("Welcome to Kuebjii's Calculator");
        System.out.println("Circle");
        System.out.println("Square");
        System.out.println("Rectangle");
        System.out.println("Please type out the number you would like to use");
        String input = reader.nextLine();
        if (input.equals("circle")) {
            circles();
        }
        if (input.equals("square")) {
            squares();
        }
        if (input.equals("rectangle")) {
            rectangle();
        }
        if (input.equals("devmode")) {
            devMode();
        }
        if (input.equals("back")) {
            mainMenu();
        }
    }

    public static void rectangle() {
        Scanner reader = new Scanner(System.in);
        System.out.println("Please enter the length of the rectangle");
        double length = reader.nextDouble();
        System.out.println("Please enter the width of the rectangle");
        double width = reader.nextDouble();

        double perimeter = 2 * (length * width);
        double area = length * width;

        System.out.println("Here is the perimeter of the rectangle: " + perimeter);
        System.out.println("Here is the area of the rectangle: " + area);
        System.out.println();
        KuebjiiCalculatorMenu();

    }

    public static void squares() {
        Scanner reader = new Scanner(System.in);
        System.out.println("Please enter one side of the square");
        double side = reader.nextDouble();
        double perimeter;
        double area;

        perimeter = side + side + side + side;
        area = side * side;

        System.out.println("Here is the perimeter of the square: " + perimeter);
        System.out.println("Here is the area of the square: " + area);
        System.out.println();
        KuebjiiCalculatorMenu();

    }

    public static void circles() {
        System.out.println("What is the radius of the circle?");
        Scanner reader = new Scanner(System.in);
        double radius = reader.nextDouble();
        double circumference;
        double area;
        circumference = 2 * 3.14 * radius;
        area = 3.14 * radius * radius;
        System.out.println("Here is the circumference of the circle" + circumference);
        System.out.println("Here is the area of the circle" + area);
        System.out.println();
        KuebjiiCalculatorMenu();
    }

    public static void devMode() {
        Scanner reader = new Scanner(System.in);
        System.out.println("D E V   C O N S O L E");
        System.out.println("1. Circle");
        System.out.println("2. Square");
        System.out.println("3. Rectangle");
        System.out.println("4. Testing Cycle");
        int selector = reader.nextInt();
        if (selector == 1) {
            System.out.println("What is the radius of the circle?");
            double radius = reader.nextDouble();
            double circumference;
            double area;
            circumference = 2 * 3.14 * radius;
            area = 3.14 * radius * radius;
            System.out.println("Radius = " + radius + " Equation for circumference: 2 * 3.14 * " + radius);
            System.out.println("Radius = " + radius + " Equation for area: 3.14 * " + radius + " * " + radius);
            System.out.println("Here is the circumference of the circle: " + circumference);
            System.out.println("Here is the area of the circle: " + area);
        }
    }

    public static void normalCalculator() {
        Scanner reader = new Scanner(System.in);

        System.out.println(Colors.RED + "Welcome to the normal calculator" + Colors.RESET);
        System.out.println(Colors.RED + "Type any equation into the line below" + Colors.RESET);
        System.out.println(Colors.BLUE + "Do you want to add, subtract, mutliply, or divide");

        System.out.print(Colors.GREEN + "> " + Colors.RESET);
        String input = reader.nextLine();

        if (input.equals("add")) {
            System.out.println(Colors.BLUE + "Now type the first number you want to add");
            double input1 = reader.nextDouble();

            System.out.println(Colors.BLUE + "Now type the second number you wan to add");
            double input2 = reader.nextDouble();

            double inputTotal = input1 + input2;

            System.out.println("Your number is: " + inputTotal);
            normalCalculator();
        }
        if (input.equals("subtract")) {
            System.out.println(Colors.BLUE + "Now type the first number you want to subtract");
            double input1 = reader.nextDouble();

            System.out.println(Colors.BLUE + "Now type the second number you wan to subtract");
            double input2 = reader.nextDouble();

            double inputTotal = input1 - input2;

            System.out.println("Your number is: " + inputTotal);
            normalCalculator();
        }
        if (input.equals("multiply")) {
            System.out.println(Colors.BLUE + "Now type the first number you want to multiply");
            double input1 = reader.nextDouble();

            System.out.println(Colors.BLUE + "Now type the second number you wan to multiply");
            double input2 = reader.nextDouble();

            double inputTotal = input1 * input2;

            System.out.println("Your number is: " + inputTotal);
            normalCalculator();
        }
        if (input.equals("divide")) {
            System.out.println(Colors.BLUE + "Now type the first number you want to divide");
            double input1 = reader.nextDouble();

            System.out.println(Colors.BLUE + "Now type the second number you wan to divide");
            double input2 = reader.nextDouble();

            double inputTotal = input1 / input2;

            System.out.println("Your number is: " + inputTotal);
            normalCalculator();
        }
    }
}