import ohjava.*;
public class TestDate {

  public static void main(String args[]) {

    System.out.println("Please give me a valid date.");
    SimpleIO.prompt("Enter day(< 31)  : ");
    int d = Integer.parseInt(SimpleIO.readLine());
    SimpleIO.prompt("Enter month(< 12): ");
    int m = Integer.parseInt(SimpleIO.readLine());
    SimpleIO.prompt("Enter year(> 0)  : ");
    int y = Integer.parseInt(SimpleIO.readLine());
    Date day = new Date(m,d,y);
    System.out.println("\nThe date you entered is " + day);

    for (;;) {
      printMenu();
      SimpleIO.prompt("Enter your option: ");
      String option = SimpleIO.readLine().toLowerCase();
      if (option.equals("a")) {
        SimpleIO.prompt("Enter number of days to add to the date: ");
        int n = Integer.parseInt(SimpleIO.readLine());
        System.out.println("\nThe date obtained after adding " + n + 
                           " to " + day + " is " + day.add(n));
      }
      else if (option.equals("s")) {
        SimpleIO.prompt("Enter number of days to subtract from the date: ");
        int n = Integer.parseInt(SimpleIO.readLine());
        System.out.println("\nThe date obtained after subtracting " + n + 
                           " from " + day + " is " + day.sub(n));
      }
      else if (option.equals("y")) {
        System.out.println("\nThe date previous to " + 
                           day + " is " + day.previousDay());
      }
      else if (option.equals("t")) {
        System.out.println("\nThe date after " + 
                           day + " is " + day.nextDay());
      }
      else if (option.equals("n")) {
        System.out.println("\nThe first day of the next month for " + 
                           day + " is " + day.firstOfNextMonth());
      }
      else if (option.equals("p")) {
        System.out.println("\nThe first day of the previous month for " + 
                           day + " is " + day.firstOfPreviousMonth());
      }
      else if (option.equals("b")) {
        System.out.println("Please give me another valid date.");
        SimpleIO.prompt("Enter day(< 31)  : ");
        int d2 = Integer.parseInt(SimpleIO.readLine());
        SimpleIO.prompt("Enter month(< 12): ");
        int m2 = Integer.parseInt(SimpleIO.readLine());
        SimpleIO.prompt("Enter year(> 0)  : ");
        int y2 = Integer.parseInt(SimpleIO.readLine());
        Date day2 = new Date(m2,d2,y2);
        System.out.println("\nThe number of days between " + day + " and "
                           + day2 + " is " + day.daysBetween(day2));
      }
      else if (option.equals("c")) {
        System.out.println("Please give me another valid date.");
        SimpleIO.prompt("Enter day(< 31)  : ");
        int d3 = Integer.parseInt(SimpleIO.readLine());
        SimpleIO.prompt("Enter month(< 12): ");
        int m3 = Integer.parseInt(SimpleIO.readLine());
        SimpleIO.prompt("Enter year(> 0)  : ");
        int y3 = Integer.parseInt(SimpleIO.readLine());
        Date day3 = new Date(m3,d3,y3);
        if (day.before(day3))
          System.out.println("\n" + day + " is before " + day3); 
        else if (day.after(day3))
          System.out.println("\n" + day + " is after " + day3); 
        else
          System.out.println("\n" + day + " is same as " + day3); 
      }
      else if (option.equals("q")) {
        break;
      }
    }
  }

  private static void printMenu() {
    System.out.println("\n          Welcome to Date Tester\n");
    System.out.println("(a) Add number to the date. ");
    System.out.println("(s) Subtract number from date. ");
    System.out.println("(y) Yesterday. ");
    System.out.println("(t) Tomorrow. ");
    System.out.println("(n) First of next month. ");
    System.out.println("(p) First of previous month. ");
    System.out.println("(b) Days between. ");
    System.out.println("(c) Compare Dates to see if one is before another. ");
    System.out.println("(q) Quit. ");
    System.out.println();
  }

}