// Program to test solutions to problem #9 on the cse142 final, winter 2019.
// Fill in your solution to surroundWithN, then compile and run the program.

import java.util.*;

public class FinalTest9 {
    public static int[] surroundWithN(int[] list1, int[] list2, int n) {
        // fill in your solution here
        // you can also rename the parameters above
    }

    // this is the sample solution
    public static int[] surroundWithN2(int[] list1, int[] list2, int n) {
        int[] result = new int[list1.length + 2 * n];
        for (int i = 0; i < n; i++) {
            result[i] = list2[i];
        }
        for (int i = 0; i < list1.length; i++) {
            result[i + n] = list1[i];
        }
        for (int i = 0; i < n; i++) {
            result[list1.length + n + i] = list2[i];
        }
        return result;
    }

    private static int testCount, failCount;

    public static final int ERRORS_MAX = 25;

    public static void main(String[] args) {
        failCount = 0;
        test(new int[] {}, new int[] {});
        test(new int[] {}, new int[] {8});
        test(new int[] {}, new int[] {3, 8});
        test(new int[] {4}, new int[] {2, 7});
        test (new int[] {7, 2, 8, 9, 4, 13, 7, 1, 9, 10},
              new int[] {1, 2, 3, 4, 5});

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

    public static void test(int[] list1, int[] list2) {
        for (int i = 0; i <= list2.length; i++)
            test(list1, list2, i);
        for (int i = 0; i <= list1.length; i++)
            test(list2, list1, i);
    }

    public static void test(int[] list1, int[] list2, int n) {
        int[] copy1 = Arrays.copyOf(list1, list1.length);
        int[] copy2 = Arrays.copyOf(list2, list2.length);
        System.out.println("testing surroundWithN(" + Arrays.toString(copy1) +
                           ", " + Arrays.toString(copy2) + ", " + n + ")");
        testCount++;
        int[] result2 = surroundWithN2(list1, list2, n);
        System.out.println("correct: " + Arrays.toString(result2));
        int[] result1 = null;
        boolean fail = false;
        RuntimeException except = null;
        try {
            result1 = surroundWithN(list1, list2, n);
        } catch (RuntimeException e) {
            fail = true;
            except = e;
        }
        fail = fail || !Arrays.equals(result1, result2) ||
            !Arrays.equals(list1, copy1) || !Arrays.equals(list2, copy2);
        if (fail) {
            if (except != null) {
                StackTraceElement[] trace = except.getStackTrace();
                int line = trace[0].getLineNumber();
                System.out.println("Threw exception at line#" + line);
            } else {
                if (!Arrays.equals(result1, result2)) {
                    System.out.println("yours  : " + Arrays.toString(result1));
                }
                if (!Arrays.equals(list1, copy1)) {
                    System.out.println("list1 was: " + Arrays.toString(copy1));
                    System.out.println("list1 now: " + Arrays.toString(list1));
                }
                if (!Arrays.equals(list2, copy2)) {
                    System.out.println("list2 was: " + Arrays.toString(copy2));
                    System.out.println("list2 now: " + Arrays.toString(list2));
                }
            }
            failCount++;
            System.out.println("failed");
        } else {
            System.out.println("passed");
        }
        System.out.println();
    }
}