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/*
 * Name: Kristina Brend
 * Login: cs11fiv
 * Date: November, 14th, 2012
 * File: ReverseRecurse.java
 * Sources of Help: TA's in lab
 *
 * This is a program that reads user input and makes an array of values, the
 * size is specified by the user and this program reverses the elements in the
 * array through two different recursive methods.
 */

import java.util.*;

/*
 *Class name: ReverseRecurse
 *Purpose: This is class reverses an array based on user input
 * */

public class ReverseRecurse
{
   //Instance variables
   int[] array;
   int[] arrayCopy;
   int[] arrayAdjusted;

   /*
   * Name: initArray
   * Purpose: Scan's input from the user en uses the size to make an array of
   * that size, and the numbers gets put into the array
   * Parameters:
   * Return: The array made from user input
   */

   public int[] initArray()
   {


    //asks user for input
    System.out.println ("Maximum number of integers you wish to enter?");
    Scanner input = new Scanner (System.in);

    int numOfInts =0;

    //checks if there is an integer entered
    if (input.hasNextInt())
    {

     numOfInts = input.nextInt();


     //checks for < = 0 condition
        while(numOfInts <= 0)
        {
        System.out.println("You must enter a value > 0, try again.");
        numOfInts = input.nextInt();
        }


     }

      //program stops with the system exit
     else
     {
     // System.out.println("Empty Array");
     System.exit (1);
     }

      // input.hasNextInt();
      // input.nextInt();

      //creates an array of the size the user decides
      array = new int[numOfInts];

      System.out.println("Enter up to " +numOfInts +" integers");

/*      //stores user inputted values into the array
      if (input.hasNextInt())
      {
         for (int index =0; index < numOfInts; index++)
         {
             array[index] = input.nextInt();
         }
      }
      else if(not a next int)
     {
      numOfInts = index + 1
      array.setSize(numofints)
      }
      else
      {
      // System.out.println("Empty Array");

      //checks condition if non int is entered and makes an array of length 0
      int indexx =0;
      arrayCopy = new int[indexx];
      System.arraycopy( array, 0, arrayCopy, 0 , indexx);
      array = arrayCopy;
      }  */
   int arraySize = 0;

   while(arraySize < numOfInts && input.hasNextInt())
   {
      array[arraySize] = input.nextInt();
      arraySize++;
   }

   if(arraySize != numOfInts)
   {
      arrayAdjusted = new int[arraySize];
      System.arraycopy(array, 0, arrayAdjusted, 0, arrayAdjusted.length);
      return arrayAdjusted;
   }
   else
   {
      int index = 0;
      arrayCopy = new int[index];
      System.arraycopy( array, 0, arrayCopy, 0 , index);
      array[arraySize]
   }

   return array;

  }

   /*
   * Name: printArray
   * Purpose: Goes through the array and prints out each element on a line with
   * space in between. Prints Empty array if theres no elements in the array.
   * Parameters: Array of numbers, ints
   * Return: void.
   */

   public void printArray(int[] array)
   {
     if(array.length > 0)
     {
        for(int index = 0; index < array.length; index++)
        {
           System.out.print(array[index] + " ");
        }
        System.out.println("");
     }
     else
     {
     System.out.println("Empty Array");
     }
   }

   /*
   * Name: reverse
   * Purpose: Uses the array, nad the lowest and the highest index to swap
   * the first and last element in the array directly. Then we call the method
   * again on the rest of the array.
   * Parameters: int[] originalArray, int low, int high
   * Return: void.
   */

   public void reverse(int[] originalArray,int low, int high)
   {
      if(high == low)
      {
         originalArray[low] = originalArray[high];
      }
      else if((low + 1) == high)
      {
         int temp;
         temp = originalArray[low];
         originalArray[low] = originalArray[high];
         originalArray[high] = temp;
      }
      else if(originalArray.length == 0)
      {

      }
      else
      {
         int temp;
         temp = originalArray[low];
         originalArray[low] = originalArray[high];
         originalArray[high] = temp;
         reverse(originalArray, ++low, --high);
      }
   }


   public int[] reverse(int[] originalArray){
   //new array with swapped values created with same length as original
   int newArraySwap[];
   newArraySwap = new int[originalArray.length];

   //new int array created that holds the remainder of the values
   int newArrayHolder[];


   //if the swapped array has length 1, it returns the original array
   if (newArraySwap.length ==1)
   {
   return originalArray;
   }


   //if the new array has lenght 0, the array is returned
   else if (newArraySwap.length == 0)
   {
   return newArraySwap;
   }


   //calls the method again till the array is properly swapped
   else
   {

   newArraySwap[0] = originalArray[originalArray.length-1];
   newArraySwap[originalArray.length-1] = originalArray[0];


   int newArrayMiddle[];
   newArrayMiddle = new int[originalArray.length -2];

   System.arraycopy(originalArray, 1, newArrayMiddle, 0,
   newArrayMiddle.length);


   newArrayHolder = reverse(newArrayMiddle);
   System.arraycopy( newArrayHolder, 0, newArraySwap, 1,
   newArrayHolder.length);
   }

   return newArraySwap;
   }


}