/**
 * This class holds our Selection Sort code.
 */
public class Sorting
{
 
    /**
     * Searches through the array that's passed in, starting at
     * position start, and returns the *position* of the smallest
     * item found between start and the end of the array.
     * 
     * @param nums  The array we're searching
     * @param start  Where to start our search
     * @return  The index of the smallest item
     */
    public int findSmallest(int[] nums, int start) 
    {
        int idxOfMin = start;
        for(int i=start+1; i<nums.length; i=i+1) {
            if (nums[i] < nums[idxOfMin]) {
                idxOfMin = i; // Found a new smallest item; remember where...
            }
        }
        return idxOfMin;  
    }
    
    /**
     * This method sorts the array passed in as parameter.  It doesn't
     * need to return anything since the changes we make to the array 
     * are "permanent".  It calls the method above as a helper. We
     * use an integer index value as the "dividing line" -- the start
     * of the unsorted region of the array.
     * 
     * @param nums  The array of ints to be sorted
     */
    public void selectionSort(int[] nums) 
    {
        // Repeat:
        //   Find position of smallest item in unsorted region
        //   Swap that item with item at the FRONT of unsorted region
        //   Advance the "dividing line"
        for(int i=0; i<nums.length-1; i=i+1) {
            int idxOfMin = findSmallest(nums, i); 
            System.out.println("Swapping "+nums[i]+" and "+nums[idxOfMin]);
            int temp = nums[i]; 
            nums[i] = nums[idxOfMin];
            nums[idxOfMin] = temp;
        }
    }
    
    
    
    public void test() {
        int[] data = {27, 12, 19, 13, 25, 12, 23, 26};
        // System.out.println(findSmallest(data, 0)); // 1
        // System.out.println(findSmallest(data, 2)); // 5
        // System.out.println(findSmallest(data, 4)); // 5
        // System.out.println(findSmallest(data, 7)); // 7
        
        for(int n : data) {
            System.out.print(" "+n);
        }
        System.out.println();
        selectionSort(data);
        for(int n : data) {
            System.out.print(" "+n);
        }
    }
    
    
    
    
    
    
    
    
}