/*
 * Copyright 2013 Klaus Reimer <k@ailis.de>
 * See LICENSE.md for licensing information.
 *
 * Based on libusb <http://www.libusb.org/>:
 *
 * Copyright 2001 Johannes Erdfelt <johannes@erdfelt.com>
 * Copyright 2007-2009 Daniel Drake <dsd@gentoo.org>
 * Copyright 2010-2012 Peter Stuge <peter@stuge.se>
 * Copyright 2008-2011 Nathan Hjelm <hjelmn@users.sourceforge.net>
 * Copyright 2009-2012 Pete Batard <pete@akeo.ie>
 * Copyright 2009-2012 Ludovic Rousseau <ludovic.rousseau@gmail.com>
 * Copyright 2010-2012 Michael Plante <michael.plante@gmail.com>
 * Copyright 2011-2012 Hans de Goede <hdegoede@redhat.com>
 * Copyright 2012 Martin Pieuchot <mpi@openbsd.org>
 * Copyright 2012-2013 Toby Gray <toby.gray@realvnc.com>
 */

package org.libusb4java;

import java.nio.ByteBuffer;

import org.apache.commons.lang3.builder.EqualsBuilder;
import org.apache.commons.lang3.builder.HashCodeBuilder;

import org.libusb4java.utils.DescriptorUtils;

/**
 * A structure representing the Container ID descriptor.
 *
 * This descriptor is documented in section 9.6.2.3 of the USB 3.0
 * specification. All multiple-byte fields, except UUIDs, are represented in
 * host-endian format.
 *
 * @author Klaus Reimer (k@ailis.de)
 */
public final class ContainerIdDescriptor
{
    /** The native pointer to the descriptor structure. */
    private long containerIdDescriptorPointer;

    /**
     * Constructs a new Container Id descriptor which can be passed to the
     * {@link LibUsb#getContainerIdDescriptor(Context, BosDevCapabilityDescriptor, ContainerIdDescriptor)}
     * method.
     */
    public ContainerIdDescriptor()
    {
        // Empty
    }

    /**
     * Returns the native pointer.
     *
     * @return The native pointer.
     */
    public long getPointer()
    {
        return this.containerIdDescriptorPointer;
    }

    /**
     * Returns the size of this descriptor (in bytes).
     *
     * @return The descriptor size in bytes;
     */
    public native byte bLength();

    /**
     * Returns the descriptor type.
     *
     * @return The descriptor type.
     */
    public native byte bDescriptorType();

    /**
     * Returns the device capability type.
     *
     * @return The device capability type.
     */
    public native byte bDevCapabilityType();

    /**
     * Returns the reserved field.
     *
     * @return The reserved field.
     */
    public native byte bReserved();

    /**
     * Returns the 128 bit UUID.
     *
     * @return The 128 bit UUID.
     */
    public native ByteBuffer containerId();

    /**
     * Returns a dump of this descriptor.
     *
     * @return The descriptor dump.
     */
    public String dump()
    {
        return String.format(
            "Container ID Descriptor:%n" +
            "  bLength %18d%n" +
            "  bDescriptorType %10d%n" +
            "  bDevCapabilityType %7d%n" +
            "  bReserved %16d%n" +
            "  ContainerID:%n%s%n",
            this.bLength() & 0xFF,
            this.bDescriptorType() & 0xFF,
            this.bDevCapabilityType() & 0xFF,
            this.bReserved() & 0xFF,
            DescriptorUtils.dump(this.containerId())
                .replaceAll("(?m)^", "    "));
    }

    @Override
    public int hashCode()
    {
        return new HashCodeBuilder()
            .append(this.bLength())
            .append(this.bDescriptorType())
            .append(this.bDevCapabilityType())
            .append(this.bReserved())
            .append(this.containerId())
            .toHashCode();
    }

    @Override
    public boolean equals(final Object obj)
    {
        if (obj == null)
        {
            return false;
        }
        if (obj == this)
        {
            return true;
        }
        if (obj.getClass() != this.getClass())
        {
            return false;
        }

        final ContainerIdDescriptor other = (ContainerIdDescriptor) obj;

        return new EqualsBuilder()
            .append(this.bLength(), other.bLength())
            .append(this.bDescriptorType(), other.bDescriptorType())
            .append(this.bDevCapabilityType(), other.bDevCapabilityType())
            .append(this.bReserved(), other.bReserved())
            .append(this.containerId(), other.containerId())
            .isEquals();
    }

    @Override
    public String toString()
    {
        return this.dump();
    }
}