import java.util.Scanner;
import java.io.File;
import java.io.FileNotFoundException;

/* Java application whose purpose is to test instances of the 
** TimeOfDay and TimeOfDay1224 classes.
*/
public class TimeOfDayTester {

   private static final String YES = "YES";
   private static final String NO = "NO";

   private static Scanner input;
   private static boolean echo;   // Should input data be echoed?
   private static boolean keepGoing; 

   public static void main(String[] args) throws FileNotFoundException {
      // Establish income source.
      establishInputSource(args);

      // Depending upon which kind of object you want to test, comment
      // out one of the two lines below.
      TimeOfDay time = new TimeOfDay(0,0);
      //TimeOfDay time = new TimeOfDay1224(0,0);

      println("Welcome to the TimeOfDay tester program.");

      keepGoing = true;
      while (keepGoing) {
         try {
            doCommand(time);
            println("");
         }
         catch (Exception e) {
            e.printStackTrace();
         }
      }
      println("Goodbye from the TimeOfDay tester program.");
   }

   public static void doCommand(TimeOfDay time) {
      String spacesPattern = " +";
      System.out.print("> ");  // prompt for input
      String commandLine = input.nextLine();
      if (echo) { println(commandLine); }
      String[] commandTokens = commandLine.split(spacesPattern);
      if (commandTokens.length == 0) 
         { }   // empty command
      else if (commandTokens.length == 1) {
         String comm0 = commandTokens[0];
         if ("q".equals(comm0)) { keepGoing = false; }
         else if ("p".equals(comm0)) { reportTime(time); }
         else if ("h".equals(comm0)) { help(); }
         else if ("s24".equals(commandTokens[0])) {  
            if (time instanceof TimeOfDay1224) { 
               ((TimeOfDay1224)time).setTo24Mode();
               reportTime(time);
            }
            else 
               { println("Cannot set mode of a TimeOfDay object"); }
         }
         else if ("s12".equals(comm0)) {  
            if (time instanceof TimeOfDay1224) { 
               ((TimeOfDay1224)time).setTo12Mode();
               reportTime(time);
            }
            else 
               { println("Cannot set mode of a TimeOfDay object"); }
         }
         else { reportUnknown(); }
      }
      else if (commandTokens.length == 2) {
         String comm0 = commandTokens[0];
         int num = Integer.parseInt(commandTokens[1]);
         if ("cm".equals(comm0)) {
            time.changeByMinutes(num);
            reportTime(time);
         }
         else if ("ch".equals(comm0)) {
            time.changeByHours(num);
            reportTime(time);
         }
         else { reportUnknown(); }
      }
      else if (commandTokens.length == 3) {
         String comm0 = commandTokens[0];
         int num1 = Integer.parseInt(commandTokens[1]);
         int num2 = Integer.parseInt(commandTokens[2]);
         if ("s".equals(comm0)) { 
            time.setTo(num1, num2);
            reportTime(time);
         }
         else if ("sa".equals(comm0)) { 
            if (time instanceof TimeOfDay1224) {
               ((TimeOfDay1224)time).setTo(num1, num2, false);
               reportTime(time);
            }
            else 
               { println("Not a legal command for a TimeOfDay object"); }
         }
         else if ("sp".equals(comm0)) { 
            if (time instanceof TimeOfDay1224) {
               ((TimeOfDay1224)time).setTo(num1, num2, true);
               reportTime(time);
            }
            else 
               { println("Not a legal command for a TimeOfDay object"); }
         }
         else if ("e".equals(comm0)) {
            TimeOfDay t = new TimeOfDay(num1, num2);
            print("Is " + time + " earlier than " + t + "? "); 
            String answer = time.isEarlierThan(t) ? YES : NO;
            println(answer);
         }
         else { reportUnknown(); }
      }
      else if (commandTokens.length == 5) {
         String comm0 = commandTokens[0];
         int num1 = Integer.parseInt(commandTokens[1]);
         int num2 = Integer.parseInt(commandTokens[2]);
         int num3 = Integer.parseInt(commandTokens[3]);
         int num4 = Integer.parseInt(commandTokens[4]);
         if ("b".equals(comm0)) {
            TimeOfDay t1 = new TimeOfDay(num1, num2);
            TimeOfDay t2 = new TimeOfDay(num3, num4);
            print("Is " + time + " between " + t1 + " and " + t2 + "? ");
            String answer = time.isBetween(t1,t2) ? YES : NO;
            println(answer);
         }
         else { reportUnknown(); }
      }
      else 
         { reportUnknown(); }
       
   }


   private static void reportTime(TimeOfDay time) {
      println("Time is " + time);
   }

   /* Displays an example of each type of command that can be issued.
   */
   private static void help() {
      println("q            (quit)");
      println("p            (print time)");
      println("h            (display list of example commands)");
      println("s 17 9       (set time to (h:17, m:9))");
      println("sa 3 47      (set time to 3:47AM)");
      println("sp 3 47      (set time to 3:47PM)");
      println("s24          (set time to 24-hour mode)");
      println("s12          (set time to 12-hour mode)");
      println("cm 531       (change time by +531 minutes)");
      println("cm -98       (change time by -98 minutes)");
      println("ch 57        (change time by +57 hours)");
      println("ch -98       (change time by -98 hours)");
      println("e 9 27       (is time earlier than (h:9, m:27)?)");
      println("b 9 27 14 45 (is time between (h:9, m:27) and (h:14, m:45)?)");
   }

   private static void reportUnknown() {
      println("Unknown command");
   }

   /* Sets the values of 'input' and 'echo' according to whether or not
   ** 'args' has length zero.  If it does, input is to be read from the
   ** keyboard and input need not be echoed.  Otherwise, input is to be 
   ** read from the file named by args[0] and needs to be echoed.
   */
   private static void establishInputSource(String[] args) throws FileNotFoundException {
      if (args.length != 0) {
         input = new Scanner(new File(args[0]));
         echo = true;
      }
      else {
         input = new Scanner(System.in);
         echo = false;
      }
   }

   /* Surrogate for System.out.println().
   */
   private static void println(String s) { System.out.println(s); }

   /* Surrogate for System.out.print().
   */
   private static void print(String s) { System.out.print(s); }


}