// Program to test solutions to problem #6 on the cse143 midterm, winter 2020.
// Fill in your solution to alternatingReverse, then compile and run the
// program.  Note that it does not test whether the exception is thrown.

import java.util.*;

public class Test6 {
    public static void alternatingReverse(Stack<Integer> s) {
        // fill in your solution here
        // you can also rename the parameter above
    }

    // this is the sample solution
    public static void alternatingReverse2(Stack<Integer> s) {
        if (s.size() % 2 != 0) {
            throw new IllegalArgumentException();
        }
        Queue<Integer> q = new LinkedList<>();
        int oldSize = s.size();
        while (!s.isEmpty()) {
            q.add(s.pop());
        }
        for (int i = 0; i < oldSize / 2; i++) {
            s.push(q.remove());
            q.add(q.remove());
        }
        while (!s.isEmpty()) {
            q.add(q.remove());
            q.add(s.pop());
        }
        while (!q.isEmpty()) {
            s.push(q.remove());
        }
    }

    private static int testCount;
    private static int failCount;

    public static void main(String[] args) {
	test(new int[] {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14});
        test(new int[] {101, 103, 105, 107, 109, 111, 113, 115, 117, 119});
        test(new int[] {200, 204, 208, 212, 216, 220, 224, 228, 232, 236});
        test(new int[] {10, 21, 12, 23, 14, 25, 16, 27, 18, 27, 20, 29});
        test(new int[] {21, 12, 23, 14, 25, 16, 27, 18, 27, 20, 29, 22});
        test(new int[] {-3, 0, 13, 42, 203, 98, 4279, 42, -5, -4, 13, 42});
	test(new Stack<>());

        if (failCount == 0) {
            System.out.println("passed all tests");
        } else {
            System.out.println("failed " + failCount + " of " + testCount + 
                               " tests");
        }
    }

    public static void test(int[] data) {
        Stack<Integer> s = new Stack<>();
        for (int i = 0; i < data.length / 2; i++) {
            s.push(data[2 * i]);
            s.push(data[2 * i + 1]);
            test(s);
        }
    }

    public static void test(Stack<Integer> s) {
        Stack<Integer> s2 = new Stack<>();
        for (int n : s) {
            s2.push(n);
        }
        System.out.println("original = " + s);
        alternatingReverse2(s);
        System.out.println("result   = " + s);
        boolean fail = false;
        try {
            alternatingReverse(s2);
        } catch (RuntimeException e) {
            int line = e.getStackTrace()[0].getLineNumber();
            System.out.println("    threw " + e + " at line #" + line);
            fail = true;
        }
        if (!fail && !s.equals(s2)) {
            System.out.println("yours    = " + s2);
            fail = true;
        }
        testCount++;
        if (fail) {
            System.out.println("failed");
            failCount++;
        } else {
            System.out.println("passed");
        }
        System.out.println();
    }
}