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package com.quorum.tessera.enclave;

import java.nio.ByteBuffer;
import java.util.List;

/**
 * Encodes bytes to the binary form expected by other nodes on the network
 */
public interface BinaryEncoder {

    /**
     * Converts a byte array to its binary form, which takes the following:
     * 8 bytes to describe the number of bytes long the data is
     * the bytes of the data
     *
     * @param data the input array to encode
     * @return the encoded byte array
     */
    default byte[] encodeField(final byte[] data) {
        return ByteBuffer
            .allocate(Long.BYTES + data.length)
            .putLong(data.length)
            .put(data)
            .array();
    }

    /**
     * Converts a list of byte arrays to its binary form, which takes the following:
     *
     * 8 bytes to describe the number of elements
     * and for each element:
     * - 8 bytes to describe the number of bytes long the element is
     * - the bytes of the element
     *
     * @param data the input array to encode
     * @return the encoded byte array
     */
    default byte[] encodeArray(final List data) {
        final byte[] elements = data
            .stream()
            .map(this::encodeField)
            .reduce(new byte[0], (a, b) -> {
                final byte[] concat = new byte[a.length + b.length];
                System.arraycopy(a, 0, concat, 0, a.length);
                System.arraycopy(b, 0, concat, a.length, b.length);
                return concat;
            });

        return ByteBuffer
            .allocate(Long.BYTES + elements.length)
            .putLong(data.size())
            .put(elements)
            .array();
    }

}