package cs437.som.network;

import cs437.som.Dimension;

import java.io.IOException;
import java.io.OutputStreamWriter;
import java.util.Arrays;

/**
 * A simple self-organizing map, using a square grid for the neurons.
 *
 * An simple example usage:
 *
 * <code>
 * <pre>
 * private static final int iterations = 500;
 *
 * public static void main(String[] args) {
 *     TrainableSelfOrganizingMap som = new BasicSquareGridSOM(7, 2, iterations);
 *     Random r = new SecureRandom();
 *
 *     for (int i = 0; i < iterations; i++) {
 *         double[] in = {r.nextDouble() * 10, r.nextDouble() * 10};
 *         som.trainWith(in);
 *     }
 *
 *     // At this point, the SOM would be queried for it's BMU.
 * }
 * </pre>
 * </code>
 */
public class BasicSquareGridSOM extends NetworkBase {

    public BasicSquareGridSOM(Dimension gridSize, int inputVectorSize, int expectedIterations) {
        super(gridSize, inputVectorSize, expectedIterations);
    }

    @Override
    protected double neuronDistance(int neuron0, int neuron1) {
        int row0 = neuron0 / gridSize.x;
        int col0 = neuron0 % gridSize.x;
        int row1 = neuron1 / gridSize.x;
        int col1 = neuron1 % gridSize.x;

        int dr = row1 - row0;
        int dc = col1 - col0;

        return Math.sqrt((dr * dr) + (dc * dc));
    }

    @Override
    public String toString() {
        return "BasicSquareGridSOM{time=" + time +
                ", weightMatrix=" + (weightMatrix == null ? null : Arrays.asList(weightMatrix)) +
                ", neuronCount=" + neuronCount + ", inputSize=" + inputVectorSize + '}';
    }

    @Override
    public void write(OutputStreamWriter destination) throws IOException {
        throw new UnsupportedOperationException("BasicSquareGridSOM write");
    }
}

@@ -1705,74 +1705,136 @@
     
-throw new UnsupportedOperationException(%22BasicSquareGridSOM write%22
+destination.write(String.format(%22Map type: BasicSquareGridSOM%25n%22));%0A        super.write(destination);%0A        destination.flush(
 );%0A 

Implement write in BasicSquareGridSOM.