import java.util.Scanner;

/* LoanRepayment.java
** Java application that, provided as inputs
**   A    : amount borrowed (in dollars)
**   I    : annual interest rate (in percent)
**   minD : minimum duration (in # of months)
**   maxD : maximum duration (in # of months)
**   
** produces a table indicating, for each duration in the range
** [minD..maxD], how much the monthly payment must be to pay off 
** the loan in that period of time.
**
** Authors: R. McCloskey and < STUDENT's NAME >
** CMPS 134  Fall 2024  Prog. Assg. #2
** Collaborated with: .....
** Known Flaws: ...
*/

public class LoanRepayment {

   private static Scanner input;  // for reading input

   // input variables
   // ---------------
   private static double A;  // amount borrowed
   private static double I;  // annual interest rate
   private static int minD;  // minimum # of months to repay loan
   private static int maxD;  // maximum # of months to repay loan


   public static void main(String[] args) {
      establishInputs(args);
      System.out.println();
      reportInputs();
      System.out.println();
      produceTable();
   }

   /* Assigns values to the four (global) input variables.
   ** If there are command line arguments, they are taken to be those inputs.
   ** Otherwise, the user enters inputs at the keyboard in response to
   ** prompts.
   */
   private static void establishInputs(String[] args) {
      if (args.length == 0) {
         // There are no command line arguments, so read input from keyboard
         input = new Scanner(System.in);
         A = getDouble("Enter amount borrowed:> ");
         I = getDouble("Enter annual interest rate:> ");
         minD = getInt("Enter min duration (# months):> ");
         maxD = getInt("Enter max duration (# months):> ");
      }
      else {
         // The command line arguments are the four inputs
         A = Double.parseDouble(args[0]);
         I = Double.parseDouble(args[1]);
         minD = Integer.parseInt(args[2]);
         maxD = Integer.parseInt(args[3]);
      }
   }

   /* Displays the input values.
   */
   private static void reportInputs() {
      System.out.printf("Loan amount: $%-10.2f\n", A);
      System.out.printf("Annual interest rate: %5.2f%%\n", I); 
      System.out.printf("Minimum duration: %3d months\n", minD); 
      System.out.printf("Maximum duration: %3d months\n", maxD); 
   }


   private static void produceTable() {
      // STUB!
   }


   /* Prints the given string (intended to be a user prompt) and returns the
   ** response (interpreted to be of type double) entered at the keyboard.
   */
   private static double getDouble(String prompt) {
      System.out.print(prompt);
      return input.nextDouble();
   }
      
   /* Prints the given string (intended to be a user prompt) and returns 
   ** the response (interpreted to be of type int) entered at the keyboard.
   */
   private static int getInt(String prompt) {
      System.out.print(prompt);
      return input.nextInt();
   }

}