// Program to test solutions to problem #5 on the cse143 midterm, spring 2018.
// Fill in your solution to extractOddIndexes, then compile and run the program
// note: this program doesn't test the exception that should be thrown

import java.util.*;

class ArrayIntList {
    public ArrayIntList extractOddIndexes() {
        // fill in your solution here
    }

    public ArrayIntList extractOddIndexes2() {
        ArrayIntList result = new ArrayIntList();
        for (int i = 0; i < size / 2; i++) {
            result.elementData[i] = elementData[2 * i + 1];
            elementData[i] = elementData[2 * i];
        }
        result.size = size / 2;
        if (size % 2 == 0) {
            size = size / 2;
        } else {
            elementData[size / 2] = elementData[size - 1];
            size = size / 2 + 1;
        }
        return result;
    }

    private int[] elementData; // list of integers
    private int size;          // current number of elements in the list

    public static final int DEFAULT_CAPACITY = 100;

    // post: constructs an empty list of default capacity
    public ArrayIntList() {
        elementData = new int[DEFAULT_CAPACITY];
        size = 0;
    }

    // post: creates a comma-separated, bracketed version of the list
    public String toString() {
        if (size == 0) {
            return "[]";
        } else {
            String result = "[" + elementData[0];
            for (int i = 1; i < size; i++) {
                result += ", " + elementData[i];
            }
            result += "]";
            return result;
        }
    }

    // post: appends the given value to the end of the list
    public void add(int value) {
        elementData[size] = value;
        size++;
    }
}

public class Test5 {
    private static int testCount, failCount;

    public static void main(String[] args) {
        test(new int[] {13, 5, 7, 12, 42, 8, 23, 31});
        test(new int[] {14, -64, 16, 88, 21, 17, -93, 81, 17});

        for (int i = 0; i < 10; i++) {
            int[] data = new int[i];
            for (int j = 0; j < i; j++) {
                data[j] = j;
            }
            test(data);
        }

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

    public static void test(int[] data) {
        ArrayIntList list1 = new ArrayIntList();
        ArrayIntList list2 = new ArrayIntList();
        for (int n : data) {
            list1.add(n);
            list2.add(n);
        }
        System.out.println("original list       = " + list1);
        ArrayIntList list3 = list1.extractOddIndexes2();
        boolean fail = false;
        ArrayIntList list4 = null;
        try {
            list4 = list2.extractOddIndexes();
        } catch (RuntimeException e) {
            int line = e.getStackTrace()[0].getLineNumber();
            System.out.println("    threw " + e  + " at line #" + line);
            fail = true;
        }
        if (!fail) {
            if (!list3.toString().equals(list4.toString())) {
                System.out.println("expected extracted list = " + list3);
                System.out.println("your extracted list     = " + list4);
                fail = true;
            } else {
                System.out.println("extracted lists match");
            }
            if (!list1.toString().equals(list2.toString())) {
                System.out.println("expected list after = " + list1);
                System.out.println("your list after     = " + list2);
                fail = true;
            } else {
                System.out.println("lists after match");
            }
        }
        testCount++;
        if (fail) {
            System.out.println("failed");
            failCount++;
        } else {
            System.out.println("passed");
        }
        System.out.println();
    }
}