package algs21;
import stdlib.*;

public class XAnimatedSelection {

  public static void sort (double[] a) {
    int N = a.length;
    show (a, 0, 0);
    for (int i = 0; i < N; i++) {
      int min = i;
      for (int j = i + 1; j < N; j++)
        if (less (a[j], a[min])) min = j;
      show (a, i, min);
      exch (a, i, min);
      assert isSorted (a, 0, i);
    }
    assert isSorted (a);
  }

  private static void show (double[] a, int i, int min) {
    StdDraw.clear ();
    //StdDraw.setYscale(-a.length + i + 1, i);
    StdDraw.setPenColor (StdDraw.LIGHT_GRAY);
    for (int k = 0; k < i; k++)
      StdDraw.line (k, 0, k, a[k]);
    StdDraw.setPenColor (StdDraw.BLACK);
    for (int k = i; k < a.length; k++)
      StdDraw.line (k, 0, k, a[k]);
    StdDraw.setPenColor (StdDraw.BOOK_RED);
    StdDraw.line (min, 0, min, a[min]);
    StdDraw.show (100);
  }

  private static boolean less (double v, double w) {
    return v < w;
  }
  private static void exch (double[] a, int i, int j) {
    double t = a[i];
    a[i] = a[j];
    a[j] = t;
  }
  private static boolean isSorted (double[] a) {
    return isSorted (a, 0, a.length - 1);
  }
  private static boolean isSorted (double[] a, int lo, int hi) {
    for (int i = lo + 1; i <= hi; i++)
      if (less (a[i], a[i - 1])) return false;
    return true;
  }

  public static void main (String[] args) {
    args = new String[] { "25" };
    int N = Integer.parseInt (args[0]);
    StdDraw.setCanvasSize (N*7, 320);
    StdDraw.setXscale (-1, N + 1);
    StdDraw.setPenRadius (.006);
    sort (ArrayGenerator.doublePartiallySortedUnique (N));
    sort (ArrayGenerator.doubleRandomUnique (N));
    sort (ArrayGenerator.doubleSortedUnique (N));
    sort (ArrayGenerator.doubleReverseSortedUnique (N));
  }

}