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

/* PlayTaxman.java
** This Java application allows a user to play a game of Taxman. 
** Alternatively, if a command line argument is provided, it is taken
** to be the name of a file in which each line contains the "user inputs"
** for a game of Taxman.
**
** @author R. McCloskey
** @version April 2020
*/
public class PlayTaxman {

   private static Scanner input;
   private static boolean echoInput;
   private static boolean gameAborted;

   public static void main(String[] args) throws FileNotFoundException {
      if (args.length != 0) {
         Scanner fileInput = new Scanner(new File(args[0]));
         echoInput = true;
         while (fileInput.hasNextLine()) {
            String line = fileInput.nextLine();
            input = new Scanner(line);
            playOneGame();
            System.out.println();
            System.out.println("-----------------------------------------");
         }
      }
      else {
         input = new Scanner(System.in);
         echoInput = false;
         gameAborted = false;
         playOneGame();
      }
   }

   public static void playOneGame() {
      System.out.println("Welcome to the Taxman Game.");
      final int N = getInt("Enter the maximum income amount: ");

      Taxman taxman = new Taxman(N);
      gameAborted = false;

      while (!gameAborted  &&  taxman.hasLegalChoices()) {
         reportState(taxman);
         int inc = getInt("\nChoose a number to add as income: "); 
         if (!gameAborted) {
            if (taxman.isLegalChoice(inc)) {
               taxman.chooseAsIncome(inc);
               System.out.printf("%d added to income.\n", inc);
            }
            else {
               System.out.println("*** ERROR ***: invalid choice; try again");
            }
         }
      }

      if (gameAborted) {
         System.out.println("*** GAME ABORTED ***");
      }
      else {
         System.out.println("\nNo choices remain.");
         System.out.println("Before paying residual taxes:");
         reportState(taxman);

         taxman.payResidualTaxes();
         System.out.println("\nAfter paying residual taxes:");
         reportState(taxman);

         reportOutcome(taxman);
      }
   }

   /* Displays the current state of the game, including total
   ** income earned, taxes paid, and the remaining active numbers.
   */
   private static void reportState(Taxman taxman) {
      System.out.printf("Income: %s\n", taxman.incomesImage());
      System.out.printf("Taxes: %s\n", taxman.taxesImage());
      System.out.println("Current score:");
      System.out.printf("  Income: %d; Taxes Paid: %d\n", 
                        taxman.incomeEarned(), taxman.taxesPaid());
      System.out.print("\nActive numbers: ");
      System.out.println(taxman.activeNumbersImage());
   }

   /* Reports the outcome (win/lose/draw) of the given game 
   ** (which is assumed to be over).
   ** pre: !taxman.hasLegalChoices()
   */
   private static void reportOutcome(Taxman taxman) {
      if (taxman.incomeEarned() > taxman.taxesPaid()) {
         System.out.println("\nYou won!");
      }
      else if (taxman.incomeEarned() < taxman.taxesPaid()) {
         System.out.println("\nYou lost.");
      }
      else {
         System.out.println("\nGame ended in a draw.");
      }
   }

   /* Displays the given prompt and returns the user's response,
   ** interpreted to be an integer value.
   */
   private static int getInt(String prompt) {
      int response = -1;
      System.out.print(prompt);
      if (!input.hasNextInt()) {
         gameAborted = true;
      }
      else {
         response = input.nextInt();
         if (echoInput) 
            { System.out.printf("%d\n", response); }
      }
      return response;
   }

}