// imports allow you to use code already written by others.  It is good to explore and learn libraries.  The names around the dots often give you a hint to the originator of the code.
import java.util.Scanner; //library for user input
import java.lang.Math; //library for random numbers


public class Menu {
    // Instance Variables
    public final String DEFAULT = "\u001B[0m";  // Default Terminal Color
    public final String[][] COLORS = { // 2D Array of ANSI Terminal Colors
        {"Default",DEFAULT},
        {"Red", "\u001B[31m"}, 
        {"Green", "\u001B[32m"}, 
        {"Yellow", "\u001B[33m"}, 
        {"Blue", "\u001B[34m"}, 
        {"Purple", "\u001B[35m"}, 
        {"Cyan", "\u001B[36m"}, 
        {"White", "\u001B[37m"}, 
    };
    // 2D column location for data
    public final int NAME = 0;
    public final int ANSI = 1;  // ANSI is the "standard" for terminal codes

    // Constructor on this Object takes control of menu events and actions
    public Menu() {
        Scanner sc = new Scanner(System.in);  // using Java Scanner Object
        
        boolean quit = false;
        while (!quit) {
            try {  // scan for Input
                this.print();  // print Menu
                int choice = sc.nextInt();  // using method from Java Scanner Object
                System.out.print("" + choice + ": ");
                quit = this.action(choice);  // take action
            } catch (Exception e) {
                sc.nextLine(); // error: clear buffer
                System.out.println(e + ": Not a number, try again.");
            }
        }
        sc.close();
    }

    // Print the menu options to Terminal
    private void print() {
        //System.out.println commands below is used to present a Menu to the user. 
        System.out.println("-------------------------\n");
        System.out.println("Choose from these choices");
        System.out.println("-------------------------\n");
        System.out.println("1 - Unit Converter");
        System.out.println("2 - Inverse Calculator");
        System.out.println("3 - Right Triangle Hypotenuse Calculator");
        System.out.println("0 - Quit");
        System.out.println("-------------------------\n");
    }

    // Private method to perform action and return true if action is to quit/exit
    private boolean action(int selection) {
        boolean quit = false;

        switch (selection) {  // Switch or Switch/Case is Control Flow statement and is used to evaluate the user selection
            case 0:  
                System.out.print("bye");
                quit = true;
                break;
            case 1:
                unitConverter();
                break;
            case 2:
                inverse();
                break;
            case 3:
                hypotenuseCalc();
                break;
                    
            default:
                //Prints error message from console
                System.out.print("Unexpected choice, try again.");
        }
        System.out.println(DEFAULT);  // make sure to reset color and provide new line
        return quit;
    }

    // Static driver/tester method
    static public void main(String[] args)  {  
        new Menu(); // starting Menu object
    }

    public void unitConverter() {
        int choice = 0;
        double num = 0.0;
        Scanner in = new Scanner(System.in);
        System.out.print("In what unit is your current number in? (1=meters;2=feet;3=miles)\n");
        try {
            choice = in.nextInt();
            System.out.println(choice);
        } catch (Exception e) {
            System.out.println("not an int");
        }
        in.close();
        in = new Scanner(System.in);
        System.out.print("whats the number you want to convert\n");
        try {
            num = in.nextDouble();
            System.out.println(num);
        } catch (Exception e) {
            System.out.println("not a double");
        }
        in.close();
        if (choice==1) {
            double feet = num*3.28084;
            double miles = num*0.000621371;
            System.out.println(num + " in feet is " + feet + " ft\n" + num + " in miles is " + miles + " mi");
        }
        else if (choice==2) {
            double meter = num*0.3048;
            double miles = num/5280;
            System.out.println(num + " in meters is " + meter + " m\n" + num + " in miles is " + miles + " mi");
        }
        else if (choice==3) {
            double meter = num*1609.34;
            double feet = num*5280;
            System.out.println(num + " in meters is " + meter + " m\n" + num + " in feet is " + feet + " ft");
        }
    }
    public void inverse() {
        double num = 0.0;
        Scanner in = new Scanner(System.in);
        in = new Scanner(System.in);
        System.out.print("what do you want to find the inverse of\n");
        try {
            num = in.nextDouble();
            System.out.println(num);
        } catch (Exception e) {
            System.out.println("not a double");
        }
        in.close();
        System.out.println("the inverse of " + num + " is " + 1/num);
    }
    public void hypotenuseCalc() {
        double num1 = 0.0;
        double num2 = 0.0;
        Scanner in = new Scanner(System.in);
        in = new Scanner(System.in);
        System.out.print("what is the length of one side\n");
        try {
            num1 = in.nextDouble();
            System.out.println(num1);
        } catch (Exception e) {
            System.out.println("not a double");
        }
        in.close();in = new Scanner(System.in);
        System.out.print("what is the length of the other side\n");
        try {
            num2 = in.nextDouble();
            System.out.println(num2);
        } catch (Exception e) {
            System.out.println("not a double");
        }
        in.close();
        System.out.println("the length of the hypotenuse is " + Math.sqrt(Math.pow(num1, 2) + Math.pow(num2, 2)));
    }
}
Menu.main(null);