import java.util.Scanner;
import java.util.ArrayList;

public class dndDice {

  public static int end = 0;

  public static void quit(){
    System.out.println("Quitting...");
    end = 1;

  }
  
  public static ArrayList<String> diceChoice(String diceType, int diceAmount) {
    ArrayList <String> result = new ArrayList <String>();
  
    for (int i = diceAmount; i > 0; i--) {

    switch(diceType){
      case "coin":
       int d2 = (int)(Math.random() * 2) +1;
        if (d2 == 1){
         result.add("Heads");
        } else {
         result.add("Tails");
       }
       break;

      case "d4":
       int d4 = (int)(Math.random() * 4) +1;
       String d4result = Integer.toString(d4);
        result.add(d4result);
       break;

      case "d6":
       int d6 = (int)(Math.random() * 6) +1;
        String d6result = Integer.toString(d6);
        result.add(d6result);
        break;
      
      case "d10":
       int d10 = (int)(Math.random() * 10) +1;
        String d10result = Integer.toString(d10);
        result.add(d10result);
        break;
       
      case "d%":
       int dperc = (int)(Math.random() * 100) +1;
        String dpercresult = Integer.toString(dperc);
        result.add(dpercresult); 
        break;
      
      case "d8":
        int d8 = (int)(Math.random() * 8) +1;
         String d8result = Integer.toString(d8);
         result.add(d8result);
         break;

      case "d12":
        int d12 = (int)(Math.random() * 12) +1;
          String d12result = Integer.toString(d12);
          result.add(d12result);
          break;
      
      case "d20":
        int d20 = (int)(Math.random() * 20) +1;
          String d20result = Integer.toString(d20);
          result.add(d20result);
          break;   

      default:

        result.add("Dice Type not found. Supported Dice Types are: coin, d4, d6, d8, d10, d%, d12, d20.");
        return result;
      }
    }
    return result;
  }
  public static void main(String[] args) {

    Scanner userInput = new Scanner(System.in);

    for (int i = end; i == 0; i = end) {
      System.out.println("Select dice type. Type \"Quit\" to quit:");
        String diceType = userInput.nextLine();
        if (diceType.equals("Quit")){
          userInput.close();
          quit();
        } else { 
      System.out.println("Select amount:");
        int diceAmount = userInput.nextInt();
        userInput.nextLine();
      System.out.println("Your results are: " + diceChoice(diceType, diceAmount));
        }
      } 
      
      }  
    }