// Exercise 2.1.4 (Solution published at http://algs4.cs.princeton.edu/)
package algs21;
import stdlib.*;
import java.awt.Font;
/* ***********************************************************************
 *  Compilation:  javac TraceInsertion.java
 *  Execution:    java  TraceInsertion input
 *
 *  Insertion sort the sequence of strings specified on the command-line
 *  and show the detailed trace.
 *
 *  % java TraceInsertion SORTEXAMPLE
 *
 *************************************************************************/

public class XTraceInsertion {

	// insertion sort
	public static void sort(String[] a) {
		int N = a.length;
		for (int i = 0; i < N; i++) {
			int j;
			for (j = i; j > 0 && less(a[j], a[j-1]); j--) {
				exch(a, j, j-1);
			}
			draw(a, i, i, j);
		}
	}


	// exchange a[i] and a[j]
	private static void exch(String[] a, int i, int j) {
		String swap = a[i];
		a[i] = a[j];
		a[j] = swap;
	}

	// is v < w ?
	private static boolean less(String v, String w) {
		return (v.compareTo(w) < 0);
	}

	//
	private static void draw(String[] a, int row, int ith, int jth) {
		StdDraw.setPenColor(StdDraw.BLACK);
		StdDraw.text(-2.50, row, ith + "");
		StdDraw.text(-1.25, row, jth + "");
		for (int i = 0; i < a.length; i++) {
			if (i == jth)      StdDraw.setPenColor(StdDraw.BOOK_RED);
			else if (i > ith)  StdDraw.setPenColor(StdDraw.LIGHT_GRAY);
			else if (i < jth)  StdDraw.setPenColor(StdDraw.LIGHT_GRAY);
			else               StdDraw.setPenColor(StdDraw.BLACK);
			StdDraw.text(i, row, a[i]);
		}
	}

	// display header
	private static void header(String[] a) {
		int N = a.length;

		StdDraw.setPenColor(StdDraw.BLACK);
		StdDraw.text(N/2, -3, "a[ ]");
		for (int i = 0; i < N; i++)
			StdDraw.text(i, -2, i + "");
		StdDraw.text(-2.50, -2, "i");
		StdDraw.text(-1.25, -2, "j");
		StdDraw.setPenColor(StdDraw.BOOK_RED);
		StdDraw.line(-3, -1.65, N-.5, -1.65);
		StdDraw.setPenColor(StdDraw.BLACK);
		for (int i = 0; i < a.length; i++)
			StdDraw.text(i, -1, a[i]);
	}

	// display footer
	private static void footer(String[] a) {
		int N = a.length;
		StdDraw.setPenColor(StdDraw.BLACK);
		for (int i = 0; i < a.length; i++)
			StdDraw.text(i, N, a[i]);
	}



	// test client
	public static void main(String[] args) {
		// parse command-line argument as an array of 1-character strings
		args = new String[] { "SORTEXAMPLE" };

		String s = args[0];
		int N = s.length();
		String[] a = ArrayGenerator.fromString (s);

		// set canvas size
		StdDraw.setCanvasSize(30*(N+3), 30*(N+3));
		StdDraw.setXscale(-3, N+1);
		StdDraw.setYscale(N+1, -3);
		StdDraw.setFont(new Font("SansSerif", Font.PLAIN, 13));

		// draw the header
		header(a);

		// sort the array
		sort(a);

		// draw the footer
		footer(a);
	}

}