/**  Supporting methods for an integer array
  *   @author Ryon Bell
  *   @version 3/28/2012
  */

public class ArrayMethodsL8b
{
  /**
   * instance variable array of ints
   */
  private int [] intArray;

  /**
   * secondary constructor,
   * the instance variable intArray will be a copy of the array created by the user
   */
  public ArrayMethodsL8b(int [] newArray)
  {
    setIntArray(newArray);
  }

  /**
   * accessor method,
   * returns a copy of the instance variable intArray
   */
  public int [] getIntArray()
  {
    // instantiate array with the same length as the parameter
    int[] copy = new int [this.intArray.length];
    for (int i = 0; i < this.intArray.length; i++)
    {
      copy[i] = this.intArray[i];
    }
    return copy;
  }

  /**
   * returns the length of the instance variable intArray
   */
  public int getLength()
  {
    return this.intArray.length;
  }

  /**
   * mutator method,
   * the instance variable intArray will be a copy of the array passed by the user
   */
  public void setIntArray(int[] newArray)
  {
    // instantiate array with the same length as the parameter
    this.intArray = new int [newArray.length];
    for (int i = 0; i < newArray.length; i++)
    {
      this.intArray[i] = newArray[i];
    }
  }

  /**
   * equals method
   * checks if the array in this object is the same as the array in the other object
   * if the lengths are not the same returns false right away
   * otherwise compairs the elements until either the first not the equal pair is found
   *    or there are no more elements to compare
   */
  public boolean equals (ArrayMethodsL8b other)
  {
    boolean isEqual = true;
    if ( this.intArray.length != other.intArray.length )
    {
      isEqual = false; // arrays are not the same size
    }
    else
    {
      for ( int i = 0; i < this.intArray.length && isEqual; i++ )
      {
        if ( this.intArray[i] != other.intArray[i] )
        {
          // found the first pair that is not the same
          // no need to compare any further
          isEqual = false;
        }
      }
    }
    return isEqual;
  }

  /**
   * toString method returns printable version
   * of the conent of intArray
   */
  public String toString()
  {
    String returnValue = "";
    for ( int i = 0; i < this.intArray.length; i++ )
    {
      returnValue += this.intArray[i] + " ";
    }
    return returnValue += "\n";
  }

  // *** BUSINESS METHODS *** //

  /**
   * "business" method that calculates product
   * of all the integers in the array
   * @return an integer - value of the product
   */
  public int arrayProduct()
  {
    int product = this.intArray[0];
    for ( int i = 1; i < this.intArray.length; i++ )
    {
      product *= this.intArray[i];
    }
    return product;
  }

  /**
   * "business" method that swpas elements if necessary
   * and calculates the numbers of swaps
   * @return an integer - value of the productthe number of swaps performed
   */
  public int calculateSwaps()
  {
    int swaps = 0;
    //STEP2
    // in a for loop compare elements pairwaise: first with last; second with the second last; etc
    // if the element at the lower index is greater thatn the element in the higher index swap them
    // remember to count the number of swaps
    for(int i = 0; i<=this.intArray.length-4;i++ ) //index 0,1,2
    {
      // need to get rid of loop cuz it is only updating x and comparing index 0 to indexs 3,4,5
      for(int x = this.intArray.length-1; x>=this.intArray.length-3;x-- ) //index 5,4,3
      {
        System.out.println("comparing " +this.intArray[i] + " and " + this.intArray[x]);
        if(this.intArray[i]>this.intArray[x])
        {
          int temp = this.intArray[i];
          this.intArray[i] = this.intArray[x];
          this.intArray[x] = temp;
          swaps++;
        }
      }
    }


    return swaps;
  }
}