/* TrapezoidApp.java
**
** Java application that utilizes methods of the Trapezoids class to produce
** character-based renderings of regular trapezoids oriented with either a 
** narrow-top or a narrow-bottom of the given length and of the given height.
** The figures themselves are drawn a specified foreground char, along with a
** specified background char, such that what is drawn is within a box.
**   
** CMPS 134 - Fall 2024
** Author: P. M. J.
** Last Modified: September 25, 2024
** Collaborated with: R. W. M.
** Known flaws: None known.
**
*/
import java.util.Scanner;

public class TrapezoidsApp {

   private static final char TOP = 'T';    //Used to indicate Top
   private static final char BOTTOM = 'B'; //Used to indicate Bottom

   private static Scanner input;
   
   public static void main(String[] args) {

      input = new Scanner(System.in);
      boolean keepGoing;
      // Loop to continue prompting for and processing input until an input
      // other than TOP or BOTTOM is entered.
      do {  
         keepGoing = makeAnotherTrapezoid();
      } while (keepGoing);
      System.out.println("Goodbye.");
   } 

   /* Prompts the user to enter inputs describing a regular trapezoid,
   ** renders it, and reports its foreground and background areas.
   ** Returns false if the user's input indicates that they want to quit,
   ** true otherwise.
   */ 
   public static boolean makeAnotherTrapezoid() {
      boolean result = true;

      char orientation = getChar("Enter 'T' or 'B' for orientation :> ");

      //Check for non-terminating condition
      if (orientation != TOP  &&  orientation != BOTTOM) {
         result = false;  // user chooses to quit
      }
      else {
         char foreground, background;
         int narrowLength, height;

         foreground = getChar("Enter foreground char :> ");
         background = getChar("Enter background char :> ");
         narrowLength = getInt("Enter length of narrow base :> ");
         height = getInt("Enter height :> ");

         // Draw the figure described by the inputs.
         if(orientation == TOP) {
            Trapezoids.drawNarrowTopTrapezoid(narrowLength,
                                              height,
                                              foreground,
                                              background);    
         } 
         else {  // orientation == BOTTOM
            Trapezoids.drawNarrowBottomTrapezoid(narrowLength,
                                                 height,
                                                 foreground,
                                                 background);    
         }

         // Compute the foreground and background areas
         int foreArea = Trapezoids.foregroundAreaOfTrapezoid(narrowLength,
                                                             height);
         int backArea = Trapezoids.backgroundAreaOfTrapezoid(narrowLength,
                                                             height);
         // Report those areas
         System.out.println("F:" + foreArea + ", B:" + backArea + "\n");
      }
      return result;
   }
   
   /* Prints the given string (intended to be a user prompt) and returns 
   ** the response (interpreted to be of type int) read by the input Scanner.
   */
   private static int getInt(String prompt) {
      System.out.print(prompt);
      int result = input.nextInt();
      input.nextLine();
      return result;
   }

   /* Prints the given string (intended to be a user prompt) and returns 
   ** the response (interpreted to be of type char) entered at the keyboard.
   */
   private static char getChar(String prompt) {
      System.out.print(prompt);
      return (input.nextLine() + " ").charAt(0);
   }

}