package ui;

import java.util.Scanner;

public class Console {
  
  /** Structured user's console input. */
  private static Scanner scanner = new Scanner (System.in);
  
  /** Prompts the user for an integer number in the console and returns it.
    * Doesn't validate the input, yet
    * @param label the prompt
    * @return the number the user entered. */
  public static int promptForInt (String label) {
    System.out.print (label + ">");
    return scanner.nextInt ();
  }
  
  /** Prompts the user for one of the options and returns the option selected.
    * Returns the last option if the reply doesn't match any of the options.
    * @param prompt
    * @param options 
    * @return option selected, last option if none selected. */
  public static String promptForOption (String prompt, String options []) {
    prompt += " (";
    for (String option: options) {prompt += option + "/";}
    prompt = prompt.substring (0, prompt.length () - 1) + ")>";
    System.out.print (prompt);
    String response = scanner.next ();
    for (String option: options) {
      if (response.startsWith (option)) {return option;}
    }
    return options [options.length - 1];
  }
  
  /** Asks the user in the console whether to quit and returns true if she enters "y".
    * @return true if entry starts with y, false otherwise. */
  public static boolean quit () {
    System.out.print ("Do you want to quit? (y/-)>");
    boolean theEnd = scanner.next ().startsWith ("y");
    if (theEnd) {System.out.print ("The End.");}
    return theEnd;
  }
  
}