import java.util.ArrayList;
import java.util.Scanner;

/**
 * Satisfies Problem 19.a.ii of Homework 1. Quoting from the assignment:
 * <p>
 * Reads a graphical representation of a comparator network on standard
 * input and produces the corresponding linear representation on
 * standard output, with the following additional constraints:
 * Each line of output, except the last, contains exactly 10
 * integers. There is exactly one space following each integer in
 * the output, unless that integer is the last one on a line, in
 * which case the space is replaced by a single newline
 * character.
 * @author Ed Ropple
 */
public class CnetGraToLinMain {

    /**
     * Entry method of cnet-gra-to-lin. Accepts input and passes to cnetlib's
     * shared functions in order to return a list of ComparatorPairs, which are
     * then sent to standard output.
     *
     * @param args      The command line arguments for the program. Are ignored
     *                  by this program.
     */
    public static void main(String[] args) {
        ArrayList<String> input = new ArrayList<String>();

        System.out.println("Enter below the graphical representation of the");
        System.out.println("sorting network you want to parse back into a");
        System.out.println("list form. Unlike cnet-lin-to-gra, whitespace");
        System.out.println("matters, though blank lines will be ignored.");
        System.out.println("Enter an X on a blank line to terminate input.");
        System.out.println();

        Boolean breakLoop = false;

        Scanner s = new Scanner(System.in);

        // read from stdin, emerge on X or x
        while (breakLoop == false)
        {
            System.out.print("> ");
            String foo = s.nextLine().trim();

            if (foo.length() < 1) continue;

            if (foo.charAt(0) == 'X' || foo.charAt(0) == 'x')
            {
                breakLoop = true;
                continue;
            }
            else
            {
                input.add(foo);
            }
        }

        ArrayList<ComparatorPair> output = Functions.outputComparatorList(input);

        System.out.println();
        System.out.println(Functions.makeCanonicalLinearOutput(output));

        System.exit(0);
    }
}