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import components.naturalnumber.NaturalNumber;
import components.naturalnumber.NaturalNumber2;
import components.simplewriter.SimpleWriter;
import components.simplewriter.SimpleWriter1L;

/**
 * Program to test arrays, references, and arrays of references.
 *
 * @author Put your name here
 *
 */
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public final class ArraysAndReferences {

/**
     * Private constructor so this utility class cannot be instantiated.
     */
    private ArraysAndReferences() {
    }

/**
     * Computes the product of the {@code NaturalNumber}s in the given array.
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     *
     * @param nnArray
     *            the array
     * @return the product of the numbers in the given array
     * @requires nnArray.length > 0
     * @ensures <pre>
     * productOfArrayElements =
     *    [nnArray[0] * nnArray[1] * ... * nnArray[nnArray.length-1]]
     * </pre>
     */
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    private static NaturalNumber productOfArrayElements(
            NaturalNumber[] nnArray) {
        assert nnArray != null : "Violation of: nnArray is not null";
        assert nnArray.length > 0 : "Violation of: nnArray.length > 0";

NaturalNumber product = nnArray[0].newInstance();
        product.setFromInt(1);

for (int i = 0; i < nnArray.length; i++) {
            product.multiply(nnArray[i]);
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        }

return product;
    }

/**
     * Replaces each element of {@code nnArray} with the partial product of all
     * the elements in the incoming array, up to and including the current
     * element.
     *
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     * @param nnArray
     *            the array
     * @updates nnArray
     * @requires nnArray.length > 0
     * @ensures <pre>
     * for all i: integer where (0 <= i < nnArray.length)
     *   (nnArray[i] = [#nnArray[0] * #nnArray[1] * ... * #nnArray[i]])
     * </pre>
     */
    private static void computePartialProducts(NaturalNumber[] nnArray) {
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        assert nnArray != null : "Violation of: nnArray is not null";
        assert nnArray.length > 0 : "Violation of: nnArray.length > 0";

// Have to start by replacing the last term of the array
        for (int i = nnArray.length - 1; i >= 0; i--) {
            NaturalNumber product = nnArray[i].newInstance();
            product.setFromInt(1);
            for (int j = 0; j <= i; j++) { // multiply all the previous (inclusive) terms
                product.multiply(nnArray[j]);

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            }
            nnArray[i].copyFrom(product); // set the value to the partial product
        }

for (int i = 0; i < nnArray.length; i++) {
            System.out.print(nnArray[i] + " ");
        }
    }

/**
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     * Creates and returns a new array of {@code NaturalNumber}s, of the same
     * size of the given array, containing the partial products of the elements
     * of the given array.
     *
     * @param nnArray
     *            the array
     * @return the array of partial products of the elements of the given array
     * @requires nnArray.length > 0
     * @ensures <pre>
     * partialProducts.length = nnArray.length  and
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     *  for all i: integer where (0 <= i < partialProducts.length)
     *    (partialProducts[i] = [nnArray[0] * nnArray[1] * ... * nnArray[i]])
     * </pre>
     */
    private static NaturalNumber[] partialProducts(NaturalNumber[] nnArray) {
        assert nnArray != null : "Violation of: nnArray is not null";
        assert nnArray.length > 0 : "Violation of: nnArray.length > 0";

NaturalNumber[] productArray = new NaturalNumber[nnArray.length];
        NaturalNumber product = nnArray[0].newInstance();
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// Start at the end
        for (int i = nnArray.length - 1; i >= 0; i--) {
            product.setFromInt(1); // set to 1 each time we compute the product
            productArray[i] = nnArray[i].newInstance();
            for (int j = 0; j <= i; j++) {
                product.multiply(nnArray[j]);
            }
            productArray[i].copyFrom(product);
        }
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return productArray;
    }

/**
     * Main method.
     *
     * @param args
     *            the command line arguments
     */
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    public static void main(String[] args) {
        SimpleWriter out = new SimpleWriter1L();

/*
         * Initialize an array of NaturalNumbers with values 1 through 42.
         */
        NaturalNumber[] array = new NaturalNumber[10];
        NaturalNumber count = new NaturalNumber2(1);
        for (int i = 0; i < array.length; i++) {
            array[i] = count.newInstance();
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            array[i].copyFrom(count);
            count.increment();
        }

for (int i = 0; i < array.length; i++) {
            System.out.print(array[i] + " ");
        }

out.println();

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        /*
         * Compute and output the product of the numbers in the array (should be
         * 42!, i.e., the factorial of 42).
         */
        NaturalNumber product = productOfArrayElements(array);
        out.println(product);

NaturalNumber[] testing = partialProducts(array);

for (int i = 0; i < testing.length; i++) {
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            System.out.print(testing[i] + " ");
        }
        out.println();

computePartialProducts(array);

out.close();
    }

}
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