/**************************************************************************
*
* Copyright (C) 2005 Steve Karg <skarg@users.sourceforge.net>
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
*********************************************************************/
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include "config.h"
#include "txbuf.h"
#include "bacdef.h"
#include "bacdcode.h"
#include "iam.h"
#include "address.h"
#include "handlers.h"

/** @file h_iam.c  Handles I-Am requests. */

/** Handler for I-Am responses.
 * Will add the responder to our cache, or update its binding.
 * @ingroup DMDDB
 * @param service_request [in] The received message to be handled.
 * @param service_len [in] Length of the service_request message.
 * @param src [in] The BACNET_ADDRESS of the message's source.
 */
void handler_i_am_add(
    uint8_t * service_request,
    uint16_t service_len,
    BACNET_ADDRESS * src)
{
    int len = 0;
    uint32_t device_id = 0;
    unsigned max_apdu = 0;
    int segmentation = 0;
    uint16_t vendor_id = 0;

    (void) service_len;
    len =
        iam_decode_service_request(service_request, &device_id, &max_apdu,
        &segmentation, &vendor_id);
#if PRINT_ENABLED
    fprintf(stderr, "Received I-Am Request");
#endif
    if (len != -1) {
#if PRINT_ENABLED
        fprintf(stderr, " from %lu, MAC = %d.%d.%d.%d.%d.%d\n",
            (unsigned long) device_id, src->mac[0], src->mac[1], src->mac[2],
            src->mac[3], src->mac[4], src->mac[5]);
#endif
        address_add(device_id, max_apdu, src);
    } else {
#if PRINT_ENABLED
        fprintf(stderr, ", but unable to decode it.\n");
#endif
    }

    return;
}

/** Handler for I-Am responses (older binding-update-only version).
 * Will update the responder's binding, but if already in our cache.
 * @note This handler is deprecated, in favor of handler_i_am_add().
 *
 * @param service_request [in] The received message to be handled.
 * @param service_len [in] Length of the service_request message.
 * @param src [in] The BACNET_ADDRESS of the message's source.
 */
void handler_i_am_bind(
    uint8_t * service_request,
    uint16_t service_len,
    BACNET_ADDRESS * src)
{
    int len = 0;
    uint32_t device_id = 0;
    unsigned max_apdu = 0;
    int segmentation = 0;
    uint16_t vendor_id = 0;

    (void) service_len;
    len =
        iam_decode_service_request(service_request, &device_id, &max_apdu,
        &segmentation, &vendor_id);
    if (len > 0) {
        /* only add address if requested to bind */
        address_add_binding(device_id, max_apdu, src);
    }

    return;
}